TWI623361B

TWI623361B - Hot pressing method and hot pressing system

Info

Publication number: TWI623361B
Application number: TW105132055A
Authority: TW
Inventors: Kenichiro Otsuka
Original assignee: Nippon Steel & Sumitomo Metal Corp
Priority date: 2016-10-04
Filing date: 2016-10-04
Publication date: 2018-05-11
Also published as: TW201813735A

Abstract

本發明的熱壓法是使用具有衝頭、衝模及內墊的模具，將胚料予以熱壓來製造壓製成型品，其中該內墊是被賦予勢能成為朝向衝模突出的狀態；本發明的熱壓法藉由讓冷媒流動在冷媒路徑，以使內墊的表面溫度T，在從模具取出壓製成型品到將下一個胚料設置於模具之間，冷卻至以100℃為上限且滿足如下數式的溫度。 T£100´(2.3/t)´(h/100)´(l/30)´(W/2)´S T：內墊的表面溫度(℃) h：內墊的加壓方向尺寸(mm) t：胚料的厚度(mm) l：內墊的熱傳導率(W/mK) W：內墊內部的冷媒路徑的體積比率(mm ³/mm ³) S：冷媒路徑中的冷媒流速(mm/sec) The hot pressing method of the present invention is a method of manufacturing a press-formed product by hot pressing a blank having a punch, a die and an inner pad, wherein the inner pad is given a potential energy to be protruded toward the die; the heat of the present invention The pressing method is performed by allowing the refrigerant to flow in the refrigerant path so that the surface temperature T of the inner pad is taken out from the mold to the next billet, and the next billet is placed between the molds, and cooled to an upper limit of 100 ° C and satisfying the following number Temperature. T£100 ́(2.3/t) ́(h/100) ́(l/30) ́(W/2) ́ST: surface temperature of the inner pad (°C) h: dimension of the inner pad (mm) t: thickness of the blank (mm) l: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path (mm/ Sec)

Description

熱壓法及熱壓系統Hot pressing method and hot pressing system

發明領域本發明是關於一種熱壓法、及執行該熱壓法的熱壓系統。FIELD OF THE INVENTION The present invention relates to a hot pressing method and a hot pressing system that performs the hot pressing method.

發明背景例如從提升油耗及保護搭乘者的觀點來考量，要求汽車用構造構件謀求維持或提升機械強度，同時謀求輕量化。一般而言，材料若具有高機械強度，則壓製加工等成型加工時的成型性低，難以加工成複雜的形狀。具有高機械強度的材料謀求提升成型性的加工方法，可舉出如專利文獻1或專利文獻2所記載的熱壓法(有時稱為熱衝印法、熱壓榨法、模壓淬火法等)，該熱壓法是將已加熱的材料(胚料或預壓製成型品)，以壓製成型模成型並急速冷卻。若採用熱壓法，由於成型時材料因高溫而軟化，故成型性優良，藉由在壓製成型模內急速冷卻而淬火，可獲得機械強度高的壓製成型品。Background of the Invention For example, from the viewpoint of improving fuel consumption and protecting a rider, it is required to maintain or increase mechanical strength of a structural member for an automobile, and to reduce weight. In general, when the material has high mechanical strength, moldability at the time of molding processing such as press working is low, and it is difficult to process into a complicated shape. A processing method for improving the moldability of a material having a high mechanical strength, such as the hot press method described in Patent Document 1 or Patent Document 2 (sometimes referred to as a hot stamping method, a hot press method, a press hardening method, etc.) The hot pressing method is to form a heated material (binder or pre-molded product) by press molding and rapidly cooling. According to the hot press method, since the material is softened by high temperature during molding, the moldability is excellent, and it is quenched by rapid cooling in a press molding die, whereby a press-molded product having high mechanical strength can be obtained.

然而，即使採用熱壓法，壓製成型品有時仍產生裂縫。為了防止壓製成型品裂開，於專利文獻3揭示了一種壓製成型品的製造方法，該壓製成型品的構件為剖面帽型，以正交於頂板的視線的俯視看來呈彎曲。於專利文獻4，揭示一種在藉由熱壓成型來成型剖面帽型的構件時，於模具(衝頭)內建圓弧狀的獨立動作衝頭，於成型下死點令獨立動作衝頭啟動的方法。於專利文獻5，揭示一種集中成型的熱壓成型法，其藉由於成型步驟，使用冷卻觸媒來冷卻材料的特定部分，以使成型性提升。然而，若將專利文獻3所記載的方法適用於熱壓法，則於衝頭肩部可能發生裂開。又，於專利文獻4所記載的方法，不能抑制在到達成型下死點前發生立壁部裂開。However, even with the hot pressing method, the press-formed product sometimes produces cracks. In order to prevent cracking of the press-formed product, Patent Document 3 discloses a method for producing a press-formed product, which has a cross-sectional hat shape and is curved in a plan view orthogonal to the line of sight of the top plate. Patent Document 4 discloses a case in which a cross-sectional hat-shaped member is formed by hot press forming, and an arc-shaped independent action punch is built in a die (punch), and an independent action punch is activated at a bottom dead center of the molding. Methods. Patent Document 5 discloses a concentrated press forming process which uses a cooling catalyst to cool a specific portion of a material by a molding step to improve moldability. However, if the method described in Patent Document 3 is applied to the hot pressing method, cracking may occur in the shoulder of the punch. Further, in the method described in Patent Document 4, it is not possible to suppress the cracking of the standing wall portion before reaching the bottom dead center of the molding.

又，使用一對模具的壓製成型中，有時採用藉由設於模具的內墊，來支撐胚料的方法。例如於專利文獻5至7，揭示一種在壓製成型時，藉由設於模具的內墊來壓住胚料的構成。然而，相較於模具主體，該內墊的體積較小，因此溫度容易上升。然後，若於內墊溫度上升的狀態下，進行熱壓成型，則製造的壓製成型品的淬火程度降低，機械強度可能降低。尤其在重複熱壓成型來製造複數個壓製成型品時，由於內墊溫度維持在上升狀態，因此製造的壓製成型品的機械強度可能降低。先行技術文獻Further, in press molding using a pair of dies, a method of supporting a billet by an inner mat provided on a mold may be employed. For example, Patent Documents 5 to 7 disclose a configuration in which a billet is pressed by an inner pad provided in a mold at the time of press molding. However, the inner pad has a smaller volume than the mold main body, so the temperature is liable to rise. Then, when hot press forming is performed in a state where the inner mat temperature is raised, the degree of quenching of the produced press-formed product is lowered, and the mechanical strength may be lowered. In particular, when the plurality of press-molded articles are produced by repeating hot press forming, since the inner pad temperature is maintained in an ascending state, the mechanical strength of the produced press-formed product may be lowered. Advanced technical literature

專利文獻專利文獻1：英國專利公報1490535號公報專利文獻2：日本特開平10-96031號公報專利文獻3：國際公開第2014-106932號小冊專利文獻4：日本特開2015-20175號公報專利文獻5：日本特開昭57-31417號公報專利文獻6：日本特開2010-149184號公報專利文獻7：日本實開平5-84418號公報Patent Document 1: Japanese Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

發明概要Summary of invention

有鑑於上述實情，本發明欲解決的課題在於提供一種熱壓法及熱壓系統，可謀求解決壓製成型品裂開並提升強度。In view of the above circumstances, an object of the present invention is to provide a hot press method and a hot press system, which can solve the cracking of the press molded product and increase the strength.

本發明者經銳意檢討的結果，想到如下所示的發明諸態樣。The inventors of the present invention have thought of the following aspects of the invention as a result of a keen review.

(1)一種熱壓法，使用具有上模、下模及內墊的模具，將胚料予以熱壓來製造壓製成型品，其中該內墊是可移動地收容於前述下模，被賦予勢能成為朝向前述上模突出的狀態；其特徵在於：於前述內墊的內部，設置冷媒的路徑；藉由讓冷媒流動在前述冷媒的路徑，以使前述內墊的表面溫度，在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，冷卻至以100℃為上限且滿足如下數式的溫度。 T£100´(2.3/t)´(h/100)´(l/30)´(W/2)´S(1) A hot pressing method in which a billet is heat-pressed using a mold having an upper mold, a lower mold, and an inner mat, wherein the inner mat is movably received in the lower mold, and is given potential energy. a state in which the upper mold protrudes; wherein: a path of the refrigerant is provided inside the inner pad; and a surface of the inner pad is removed from the mold by allowing a refrigerant to flow in the path of the refrigerant The molded product was pressed until the next blank was placed between the above-mentioned dies, and cooled to a temperature of 100 ° C as the upper limit and satisfying the following formula. T£100 ́(2.3/t) ́(h/100) ́(l/30) ́(W/2) ́S

在此，here,

T：內墊的表面溫度(℃)T: surface temperature of the inner pad (°C)

h：內墊的加壓方向尺寸(mm) h: the pressing direction dimension of the inner pad (mm)

t：胚料的厚度(mm) t: thickness of the billet (mm)

λ：內墊的熱傳導率(W/mK) λ: thermal conductivity of the inner pad (W/mK)

W：內墊內部的冷媒路徑的體積比率(mm³/mm³) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ )

S：冷媒路徑中的冷媒流速(mm/sec) S: refrigerant flow rate in the refrigerant path (mm/sec)

(2)如前述(1)所記載的熱壓法，其特徵為：將從前述模具取出壓製成型品到將下一個胚料設置於前述模具的時間，設為以5秒為下限且滿足如下數式的時間。 (2) The hot press method according to the above (1), characterized in that the time from which the press-formed product is taken out from the mold to the time when the next blank is placed on the mold is set to a lower limit of 5 seconds and satisfies the following The time of the number.

A5×(t/2.3)×(100/h)×(30/λ)×(2/W)×(1/S) A 5 × (t / 2.3) × (100 / h) × (30 / λ) × (2 / W) × (1/S)

在此， here,

A：從模具取出壓製成型品到將下一個胚料設置於模具的時間(sec) A: The time from the removal of the press-formed product from the mold to the time when the next blank is placed in the mold (sec)

t：胚料的厚度(mm) t: thickness of the billet (mm)

(3)如前述(1)或(2)所記載的熱壓法，其特徵為：前述內墊的加壓方向尺寸是以100mm為下限且滿足如下數式。 (3) The hot press method according to the above (1) or (2), wherein the inner pad has a pressing direction dimension of 100 mm as a lower limit and satisfies the following formula.

h100×(t/2.3)×(30/λ)×(2/W)×(1/S) h 100 × (t / 2.3) × (30 / λ) × (2 / W) × (1/S)

在此， here,

t：胚料的厚度(mm)t: thickness of the billet (mm)

l：內墊的熱傳導率(W/mK)l: thermal conductivity of the inner pad (W/mK)

W：內墊內部的冷媒路徑的體積比率(mm³/mm³)W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ )

(4)如前述(1)至(3)中任一項所記載的熱壓法，其特徵為：在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，對前述內墊噴射流體的冷媒來冷卻前述內墊。(4) The hot press method according to any one of (1) to (3), wherein the press-molded article is taken out from the mold until the next blank is placed between the molds, The inner pad ejects a fluid refrigerant to cool the inner pad.

(5)如前述(1)至(4)中任一項所記載的熱壓法，其特徵為：於前述上模設置冷媒噴射孔，該冷媒噴射孔可朝向前述內墊噴射冷媒；在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，使前述上模接近前述下模，從前述冷媒噴射孔，朝向設置於前述下模的前述內墊噴射冷媒，藉此冷卻前述內墊。(5) The hot press method according to any one of (1) to (4), wherein a refrigerant injection hole is provided in the upper mold, and the refrigerant injection hole is capable of injecting a refrigerant toward the inner pad; The mold takes out the press-formed product until the next blank is placed between the molds, and the upper mold is brought close to the lower mold, and the refrigerant is sprayed from the refrigerant injection hole toward the inner liner provided in the lower mold. The aforementioned inner cushion.

(6)一種熱壓系統，其特徵為具有：壓機，使用具有上模、下模及內墊的模具，將胚料予以熱壓，其中該內墊可移動地收容於前述下模，被賦予勢能成為朝向前述上模突出的狀態，且於內部設有冷媒的路徑；及冷卻控制部，控制冷卻前述內墊的冷媒的供給，前述冷卻控制部是藉由讓冷媒流動在前述冷媒的路徑，以使前述內墊的表面溫度，在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，冷卻至以100℃為上限且滿足如下數式的溫度。 T£100´(2.3/t)´(h/100)´(l/30)´(W/2)´S(6) A hot pressing system, comprising: a press machine, wherein a billet is heat-pressed using a mold having an upper mold, a lower mold, and an inner mat, wherein the inner mat is movably received in the lower mold, The potential energy is provided in a state of protruding toward the upper mold, and a path of the refrigerant is provided therein; and a cooling control unit controls supply of the refrigerant that cools the inner pad, and the cooling control unit is configured to allow the refrigerant to flow through the refrigerant. The surface temperature of the inner mat is set between the press mold and the next billet between the molds, and is cooled to a temperature of 100 ° C as an upper limit and satisfying the following formula. T£100 ́(2.3/t) ́(h/100) ́(l/30) ́(W/2) ́S

在此， here,

T：內墊的表面溫度(℃) T: surface temperature of the inner pad (°C)

t：胚料的厚度(mm) t: thickness of the billet (mm)

(7)如前述(6)所記載的熱壓系統，其特徵為：將從前述模具取出壓製成型品到將下一個胚料設置於前述模具的時間，設為以5秒為下限且滿足如下數式的時間。 (7) The hot press system according to the above (6), wherein the time from which the press-formed product is taken out from the mold to the time when the next blank is placed on the mold is set to a lower limit of 5 seconds and satisfies the following The time of the number.

在此， here,

t：胚料的厚度(mm) t: thickness of the billet (mm)

(8)如前述(6)或(7)所記載的熱壓系統，其特徵為：前述內墊的加壓方向尺寸是以100mm為下限且滿足如下數式。 (8) The hot press system according to the above (6) or (7), wherein the inner pad has a pressing direction dimension of 100 mm as a lower limit and satisfies the following formula.

h100×(t/2.3)×(30/λ)×(2/W)×(1/S)h 100 × (t / 2.3) × (30 / λ) × (2 / W) × (1/S)

在此， h：內墊的加壓方向尺寸(mm) t：胚料的厚度(mm) l：內墊的熱傳導率(W/mK) W：內墊內部的冷媒路徑的體積比率(mm ³/mm ³) S：冷媒路徑中的冷媒流速(mm/sec) Here, h: the direction of the pressing direction of the inner pad (mm) t: the thickness of the blank (mm) l: the thermal conductivity of the inner pad (W/mK) W: the volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: Flow rate of refrigerant in the refrigerant path (mm/sec)

(9)如前述(6)至(8)中任一項所記載的熱壓系統，其特徵為進一步具有冷媒噴射部，該冷媒噴射部對前述內墊噴射冷媒；前述冷媒噴射部是在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，對前述內墊噴射流體的冷媒來冷卻前述內墊。(9) The hot press system according to any one of the aspects of the present invention, characterized in that the refrigerant injection unit further includes a refrigerant injection unit that injects a refrigerant into the inner pad, and the refrigerant injection unit is in a slave The mold takes out the press-formed product until the next blank is placed between the molds, and the fluid is sprayed on the inner mat to cool the inner mat.

(10)如前述(6)至(9)中任一項所記載的熱壓系統，其特徵為：於前述上模設置冷媒噴射孔，該冷媒噴射孔可朝向前述內墊噴射冷媒；在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，前述壓機使前述上模接近前述下模，前述冷卻控制部使冷媒從前述冷媒噴射孔，朝向設置於前述下模的前述內墊噴射，藉此冷卻前述內墊。(10) The hot press system according to any one of the preceding aspects, wherein the upper mold is provided with a refrigerant injection hole that can inject a refrigerant toward the inner pad; The mold takes out the press-formed product until the next blank is placed between the molds, and the press brings the upper mold closer to the lower mold, and the cooling control unit causes the refrigerant to pass from the refrigerant injection hole toward the lower mold. The aforementioned inner pad is sprayed, thereby cooling the aforementioned inner pad.

藉由本發明，可謀求抑制壓製成型品裂開及強度提升。According to the present invention, it is possible to suppress cracking and strength improvement of the press-formed product.

用以實施發明之形態以下參考圖式來詳細說明本發明的實施形態。於本發明的實施形態，表示使用第1模具製造第1壓製成型品之例、及使用第2模具製造第2壓製成型品之例。為了便於說明，單純稱「模具」時，包含「第1模具」及「第2模具」雙方，稱「壓製成型品」時，包含「第1壓製成型品」及「第2壓製成型品」雙方。然後，於本發明的實施形態，以1次熱壓成型的循環來製造1個壓製成型品，藉由重複熱壓成型循環，來連續製造複數個壓製成型品。又，於各圖，以箭頭P表示加壓方向。再者，加壓方向P是指熱壓成型時，上模與下模的相對移動方向，於本發明的實施形態為上下方向。MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment of the present invention, an example in which the first press-molded article is produced using the first die and an example in which the second press-molded article is produced using the second die are shown. For the sake of explanation, the "first mold" and the "second mold" are both referred to as "the first mold" and the "second press molded product". . Then, in the embodiment of the present invention, one press-molded article is produced by one cycle of hot press forming, and a plurality of press-molded articles are continuously produced by repeating the hot press forming cycle. Moreover, in each figure, the pressurization direction is shown by the arrow P. In addition, the pressurization direction P means the relative movement direction of the upper mold and the lower mold at the time of hot press forming, and is an up-down direction in embodiment of this invention.

＜壓製成型品＞首先說明藉由本發明實施形態的熱壓法所製造的壓製成型品8、9的構成例。作為藉由本發明實施形態的熱壓法所製造的壓製成型品8、9，舉例表示圖1所示的第1壓製成型品8、及圖2所示的第2壓製成型品9。第1壓製成型品8及第2壓製成型品9是藉由將胚料7的鋼板，予以熱壓成型而製造。胚料7所適用的鋼板，針對淬火性而言，以質量百分比表示的碳量為0.09～0.50%，更宜為0.11%以上，厚度在0.6～3.2mm的範圍，更宜約2.3mm。<Pressure Molded Article> First, a configuration example of the press-molded articles 8 and 9 produced by the hot press method according to the embodiment of the present invention will be described. The press-molded articles 8 and 9 produced by the hot press method according to the embodiment of the present invention are exemplified by the first press-molded article 8 shown in Fig. 1 and the second press-molded article 9 shown in Fig. 2 . The first press-molded article 8 and the second press-molded article 9 are produced by hot press forming a steel sheet of the billet 7. The steel sheet to which the blank 7 is applied has a carbon content of 0.09 to 0.50%, more preferably 0.11% or more, and a thickness of 0.6 to 3.2 mm, more preferably about 2.3 mm, for the hardenability.

如圖1及圖2所示，壓製成型品8、9分別具有帽形狀部分。帽形狀部分具有：頂板部81、91；2個稜線部82、92，其連續於頂板部81、91的兩側而形成；及2個縱壁部83、93，其連續於2個稜線部的各個而形成。頂板部81、91是例如延伸於大致與加壓方向P呈直角的方向的板狀部分。稜線部82、92係以預定曲率彎曲或屈曲的部分。縱壁部83、93是對於加壓方向P以預定角度傾斜，或平行於加壓方向P的部分。As shown in FIGS. 1 and 2, the press-molded articles 8 and 9 each have a cap-shaped portion. The cap-shaped portion has: top plate portions 81, 91; two ridge portions 82, 92 which are formed continuously on both sides of the top plate portions 81, 91; and two vertical wall portions 83, 93 which are continuous with two ridge portions Each formed. The top plate portions 81 and 91 are, for example, plate-like portions extending in a direction substantially perpendicular to the pressing direction P. The ridge portions 82, 92 are portions that are bent or flexed with a predetermined curvature. The vertical wall portions 83, 93 are portions that are inclined at a predetermined angle with respect to the pressing direction P or parallel to the pressing direction P.

進而言之，於第1壓製成型品8，如圖1所示，在2個稜線部82及2個縱壁部83各個的至少一方，設有曲部84，其就加壓方向視點看來，彎曲或屈曲成往預定方向伸出。又，第2壓製成型品9的頂板部91如圖2所示，具有高度方向位置(加壓方向位置)互異的部分。然後，頂板部91的高度較高的部分(以下稱為「頂板高部911」)與高度較低的部分(以下稱為「頂板低部912」)是由階差狀部分之頂板階差部913來劃分。In the first press-molded article 8, as shown in FIG. 1, at least one of the two ridge portions 82 and the two vertical wall portions 83 is provided with a curved portion 84, which is viewed from the viewpoint of the pressurization direction. Bending or flexing to extend in a predetermined direction. Further, as shown in FIG. 2, the top plate portion 91 of the second press-molded article 9 has a portion in which the height direction position (pressure direction position) is different. Then, a portion having a higher height of the top plate portion 91 (hereinafter referred to as "top plate high portion 911") and a portion having a lower height (hereinafter referred to as "top plate lower portion 912") are step portions of the step portion of the stepped portion. 913 to divide.

再者，圖1及圖2所示的壓製成型品8、9均是藉由本發明實施形態的熱壓法所製造的壓製成型品的例示。由本發明實施形態的熱壓法所製造的壓製成型品，不限定於圖1或圖2所示的形狀。Further, both of the press-molded articles 8 and 9 shown in Fig. 1 and Fig. 2 are exemplified by a press-molded article produced by the hot press method of the embodiment of the present invention. The press-molded article produced by the hot press method according to the embodiment of the present invention is not limited to the shape shown in Fig. 1 or Fig. 2 .

＜模具＞接著，參考圖3A～圖4來說明本發明實施形態的熱壓法所用的模具2、3的構成例。圖3A是模式性表示製造第1壓製成型品8所用的第1模具2的構成例的剖面圖，且是以與頂板部81的長度方向呈直角的面，切斷成型曲部84的衝頭曲部216的剖面圖。圖3B是模式性表示製造第1模具2的衝頭21的構成例的立體圖，且是表示成型曲部84部分的圖。圖4是模式性表示製造第2壓製成型品9所用的第2模具3的構成例的剖面圖，且是將成型頂板高部911、頂板階差部913及頂板低部912的部分，以平行於該等的排列方向的面切斷的剖面圖。<Mold> Next, a configuration example of the molds 2 and 3 used in the hot press method according to the embodiment of the present invention will be described with reference to Figs. 3A to 4 . 3A is a cross-sectional view schematically showing a configuration example of the first metal mold 2 used for manufacturing the first press-molded product 8, and is a punch that cuts the molded curved portion 84 at a right angle to the longitudinal direction of the top plate portion 81. A cross-sectional view of the curved portion 216. 3B is a perspective view schematically showing a configuration example of the punch 21 for manufacturing the first metal mold 2, and is a view showing a portion of the curved curved portion 84. 4 is a cross-sectional view schematically showing a configuration example of the second mold 3 used for manufacturing the second press-molded article 9, and is a portion in which the top plate height portion 911, the top plate step portion 913, and the top plate lower portion 912 are formed in parallel. A cross-sectional view taken along the plane of the alignment direction.

如圖3A、圖3B及圖4所示，模具2、3分別具有：作為下模的衝頭21、31；作為上模的衝模22、32；內墊23、33，其可來回移動於加壓方向P而設置於衝頭21、31；及賦予勢能機構24、34，將內墊23、33朝向衝模22、32側賦予勢能。As shown in FIG. 3A, FIG. 3B and FIG. 4, the molds 2, 3 respectively have: punches 21, 31 as lower molds; dies 22, 32 as upper molds; inner pads 23, 33, which can be moved back and forth The punches 21 and 31 are provided in the pressing direction P; and the potential energy mechanisms 24 and 34 are provided, and the inner pads 23 and 33 are biased toward the dies 22 and 32.

衝頭21、31具有：衝頭突部211、311，其朝向衝模22、32側突出；衝頭頂部212、312，其設置於衝頭突部211、311的前端；2個衝頭肩R角部213、313，其連續設置於衝頭頂部212、312；及2個衝頭縱壁部214、314，其連續設置於2個衝頭肩R角部213、313之各個。衝頭頂部212、312是成型壓製成型品8、9的頂板部81、91的部分，具有例如大致與加壓方向P呈直角的平面狀構成。衝頭肩R角部213、313是成型壓製成型品8、9的稜線部82、92的部分，所具有的曲面狀構成具有預定曲率半徑。衝頭縱壁部214、314是成型壓製成型品8、9的縱壁部83、93的部分，具有以預定角度往加壓方向P傾斜的平面狀構成，或平行於加壓方向P的平面狀構成。再者，衝頭21、31各部的具體形狀是因應製造的壓製成型品8、9的形狀等來規定，不限定於圖3A、圖3B或圖4所示形狀。The punches 21, 31 have punch projections 211, 311 which protrude toward the die 22, 32 side; punch tops 212, 312 which are provided at the front ends of the punch projections 211, 311; and two punch shoulders R The corner portions 213 and 313 are continuously disposed on the punch top portions 212 and 312, and the two punch vertical wall portions 214 and 314 are continuously provided in each of the two punch shoulder R corner portions 213 and 313. The punch tops 212 and 312 are portions of the top plate portions 81 and 91 of the press-molded products 8 and 9, and have a planar configuration which is substantially perpendicular to the pressing direction P, for example. The punch shoulder R corner portions 213 and 313 are portions of the ridge portions 82 and 92 of the press-formed products 8 and 9, and have a curved shape having a predetermined radius of curvature. The punch vertical wall portions 214 and 314 are portions of the vertical wall portions 83 and 93 of the press-formed products 8 and 9, and have a planar shape inclined at a predetermined angle toward the pressurizing direction P, or a plane parallel to the pressurizing direction P. Shaped. Further, the specific shape of each of the punches 21 and 31 is defined by the shape of the press-molded articles 8 and 9 to be manufactured, and is not limited to the shape shown in FIG. 3A, FIG. 3B or FIG.

如圖3B所示，於第1模具2，在2個衝頭肩R角部213及2個衝頭縱壁部214各個的至少一方，為了成型曲部84而設置衝頭曲部216，該衝頭曲部216是彎曲或屈曲成在加壓方向視點看來，往預定方向伸出。又，如圖4所示，於第2模具3，為了成型頂板部91之高度互異的頂板高部911及頂板低部912，於衝頭頂部312設置高度不同的部分。具體而言，設置衝頭高頂部316及衝頭低頂部317，該衝頭高頂部316是用以成型頂板高部911的部分，其高度較高，衝頭低頂部317是用以成型頂板低部912的部分，其高度較低。As shown in FIG. 3B, in the first mold 2, at least one of the two punch shoulder R corner portions 213 and the two punch vertical wall portions 214 is provided with a punch curved portion 216 for forming the curved portion 84. The punch curved portion 216 is bent or bent to protrude in a predetermined direction from the viewpoint of the pressurizing direction. Further, as shown in FIG. 4, in the second mold 3, in order to form the top plate height portion 911 and the top plate lower portion 912 having different heights of the top plate portion 91, portions having different heights are provided on the punch top portion 312. Specifically, a punch high top 316 and a punch low top 317 are provided. The punch high top 316 is a portion for forming the top plate high portion 911, and the height is high, and the punch low top portion 317 is used to form the top plate low. The portion of the portion 912 has a lower height.

如圖3A所示，於第1模具2的衝頭21的衝頭頂部212，設置內墊收容孔215，於該內墊收容孔215，內墊23收容成可來回移動於加壓方向P，該內墊23是有別於衝頭21的另外構件。於內墊23設有：內墊頂部231，其位於與衝模22相對向側；及內墊肩R角部232，其連續於內墊頂部231的兩側。內墊肩R角部232具有曲面狀構成，該曲面狀構成具有預定的曲率半徑。As shown in FIG. 3A, an inner pad receiving hole 215 is provided in the punch top 212 of the punch 21 of the first die 2, and the inner pad 23 is accommodated so as to be movable back and forth in the pressing direction P. The inner pad 23 is an additional member that is different from the punch 21. The inner pad 23 is provided with an inner pad top 231 located on the opposite side from the die 22, and an inner pad R corner 232 continuing from both sides of the inner pad top 231. The inner pad shoulder R corner portion 232 has a curved shape, and the curved shape has a predetermined radius of curvature.

然後，內墊23是由賦予勢能機構24，朝向衝模22側被賦予勢能，內墊頂部231及內墊肩R角部232維持在，比衝頭頂部212更往衝模22側突出預定尺寸的狀態。內墊23的突出尺寸設定為，若在胚料7載置於內墊頂部231的狀態下，胚料7不會接觸衝頭頂部212及衝頭肩R角部213的尺寸。但具體的突出尺寸並未特別限定。又，內墊23若從衝模22側推壓，則進入內墊收容孔215的內部，內墊頂部231及衝頭頂部212成為相同高度。換言之，內墊頂部231及衝頭頂部212成為齊平面。於該狀態下，內墊頂部231成為衝頭頂部212的一部分。Then, the inner pad 23 is biased toward the die 22 by the potential energy supply mechanism 24, and the inner pad top portion 231 and the inner pad shoulder R corner portion 232 are maintained to protrude from the punch top portion 212 toward the die 22 side by a predetermined size. The protruding dimension of the inner pad 23 is set such that the blank 7 does not contact the size of the punch top 212 and the punch shoulder R corner 213 in a state where the blank 7 is placed on the inner pad top 231. However, the specific protruding size is not particularly limited. Further, when the inner pad 23 is pressed from the side of the die 22, it enters the inside of the inner pad receiving hole 215, and the inner pad top 231 and the punch top 212 have the same height. In other words, the inner pad top 231 and the punch top 212 are flush planes. In this state, the inner pad top 231 becomes part of the punch top 212.

如圖4所示，於第2模具3的衝頭31的衝頭頂部312，亦設有內墊收容孔315，於該內墊收容孔315，內墊33收容成可來回移動於加壓方向P，該內墊33是有別於衝頭31的另外構件。再者，於第2模具3，內墊收容孔315設置於衝頭低頂部317(成型頂板低部912的部分)。又，如圖4，衝頭高頂部316與內墊33是在與加壓方向P呈直角的方向(於圖4的紙面為左右方向)，空出預定距離而離隔。例如圖4所示，衝頭低頂部317介在衝頭高頂部316與內墊33之間。該距離設定為若在胚料7載置於內墊頂部231及衝頭高頂部316的狀態下，胚料7中的頂板階差部913及縱壁部93的部分(尤其是縱壁部93之中位於頂板階差部913附近的部分)不會接觸內墊33及衝頭高頂部316的距離。As shown in FIG. 4, an inner pad receiving hole 315 is also provided in the punch top 312 of the punch 31 of the second die 3, and the inner pad 33 is accommodated so as to be movable back and forth in the pressing direction. P, the inner pad 33 is an additional member different from the punch 31. Further, in the second mold 3, the inner pad receiving hole 315 is provided in the punch lower top portion 317 (the portion where the top plate lower portion 912 is formed). Further, as shown in Fig. 4, the punch high top portion 316 and the inner pad 33 are separated from each other by a predetermined distance in a direction perpendicular to the pressing direction P (the paper surface in Fig. 4 is a left-right direction). For example, as shown in FIG. 4, the punch low top 317 is interposed between the punch top 316 and the inner pad 33. This distance is set to a portion of the top step portion 913 and the vertical wall portion 93 in the billet 7 in a state where the billet 7 is placed on the inner top portion 231 and the punch top portion 316 (particularly, the vertical wall portion 93). The portion located near the top step portion 913 does not contact the distance between the inner pad 33 and the punch high top 316.

然後，於第2模具3，內墊33是由賦予勢能機構34，朝向衝模32側被賦予勢能，內墊頂部331維持在比衝頭低頂部317更往衝模32側突出的狀態。該突出尺寸設定為，若在胚料7載置於內墊頂部331及衝頭高頂部316的狀態下，胚料7不會接觸衝頭低頂部317的尺寸。又，內墊33若從衝模32側推壓，則進入內墊收容孔315的內部，內墊頂部331及衝頭低頂部317成為相同高度。於該狀態下，內墊頂部331成為衝頭低頂部317的一部分。Then, in the second mold 3, the inner pad 33 is provided with the potential energy mechanism 34, and the potential energy is applied toward the die 32 side, and the inner pad top portion 331 is maintained in a state of being protruded toward the die 32 side from the punch lower top portion 317. The protruding dimension is set such that if the blank 7 is placed on the inner pad top 331 and the punch high top 316, the blank 7 does not contact the size of the punch lower top 317. Further, when the inner pad 33 is pressed from the side of the die 32, it enters the inside of the inner pad receiving hole 315, and the inner pad top 331 and the punch lower top 317 have the same height. In this state, the inner pad top 331 becomes part of the punch low top 317.

再者，內墊23、33的構成若是可支撐胚料7之中，在熱壓成型後成為頂板部81、91的至少一部分的部分即可。尤其是內墊23、33的構成若是在熱壓成型時，可支撐胚料7之中，在與加壓方向P呈直角的方向，有張力加施的部分或其附近即可。又，其構成若可支撐胚料7之中，在熱壓成型後成為頂板部81、91的全體部分即可。於圖3B表示內墊23設置於衝頭曲部216及其附近的構成，但內墊設置遍及衝頭頂部212的全長的構成亦可。Further, the inner pads 23 and 33 may be configured to support at least a part of the top plate portions 81 and 91 after the hot press forming. In particular, when the inner pads 23 and 33 are formed during the hot press forming, the blank 7 can be supported, and the portion to be applied by tension or the vicinity thereof in the direction perpendicular to the pressurizing direction P may be used. Further, the configuration may be such that the main material 7 can be supported, and the entire portions of the top plate portions 81 and 91 may be formed after hot press forming. FIG. 3B shows a configuration in which the inner pad 23 is provided in the punch curved portion 216 and its vicinity, but the inner pad may be provided over the entire length of the punch top portion 212.

又，賦予勢能機構24、34的構成若是可將內墊23、33，朝向衝模22、32側賦予勢能即可，不限定具體的構成。於賦予勢能機構24、34，可適用例如彈簧或氣墊等類之習知的各種賦予勢能機構。Further, the configuration of the potential energy mechanisms 24 and 34 may be such that the inner pads 23 and 33 can be provided with potential energy toward the dies 22 and 32, and the specific configuration is not limited. For the energy-enhancing mechanisms 24 and 34, various types of potential-enhancing mechanisms such as springs or air cushions can be applied.

於衝模22、32設有衝頭突部211、311可嵌入的衝模凹部221、321。於衝模凹部221、321的緣部，設有衝模肩R角部222、322。衝模肩R角部222、322具有曲面狀構成，該曲面狀構成具有預定的曲率半徑。於衝模凹部221、321的底部，在與收容於內墊收容孔215、315的內墊23、33相對向的位置，設有冷媒噴射孔223、323，其用以朝向內墊23噴射冷媒。冷媒噴射孔223、323是冷卻內墊23、33的內墊冷卻機構13(後述)的一部分。藉由從冷媒噴射孔223、323，朝向內墊23、33噴射水或空氣等冷媒，可冷卻內墊23、33。The dies 22 and 32 are provided with die recesses 221 and 321 into which the punch projections 211 and 311 can be fitted. Die edge R corner portions 222 and 322 are provided at the edge portions of the die recesses 221 and 321 . The die shoulder R corner portions 222, 322 have a curved shape having a predetermined radius of curvature. The refrigerant injection holes 223 and 323 are provided at the bottoms of the die recesses 221 and 321 at positions facing the inner pads 23 and 33 accommodated in the inner pad receiving holes 215 and 315 for injecting the refrigerant toward the inner pad 23. The refrigerant injection holes 223 and 323 are a part of the inner pad cooling mechanism 13 (described later) that cools the inner pads 23 and 33. The inner pads 23 and 33 can be cooled by ejecting a refrigerant such as water or air from the refrigerant injection holes 223 and 323 toward the inner pads 23 and 33.

＜內墊構成及冷卻方法＞在此，說明內墊23、33的詳細構成例及冷卻方法。於本發明的實施形態，藉由使用模具2、3，將升溫至700～950℃的溫度範圍，升溫至約750℃更佳的胚料7予以成型，並且冷卻，來製造壓製成型品8、9。然後，熱壓成型時，一面藉由內墊23、33支撐胚料7，一面藉由衝頭21、31及衝模22、32，成型為預定形狀。因此，熱壓成型時，胚料7的一部分會與內墊23、33接觸。<Inner Pad Configuration and Cooling Method> Here, a detailed configuration example of the inner pads 23 and 33 and a cooling method will be described. In the embodiment of the present invention, by using the molds 2 and 3, the billet 7 which is heated to a temperature range of 700 to 950 ° C and heated to a temperature of about 750 ° C is molded and cooled to produce a press-molded product 8 . 9. Then, at the time of hot press forming, the blank 7 is supported by the inner pads 23, 33, and formed into a predetermined shape by the punches 21, 31 and the dies 22, 32. Therefore, at the time of hot press forming, a part of the blank 7 comes into contact with the inner pads 23, 33.

就如此製造的壓製成型品8、9而言，為了使熱壓成型接觸內墊23、33部分的強度達1500MPa以上，必須使該部分的冷卻速度達30℃/sec以上。然而，由於相較於衝頭21、31或衝模22、32，內墊23、33的體積小，因此熱壓成型時溫度容易上升。尤其是藉由重複熱壓成型的循環，來連續製造複數個壓製成型品8、9時，內墊23、33容易維持在升溫狀態。然後，若於內墊23、33升溫的狀態下實施熱壓成型，則胚料7之中接觸內墊23、33的部分的冷卻速度減慢，不能獲得預定強度。因此，於本發明的實施形態，藉由採用如下內墊23、33的構成及冷卻方法，可加快胚料7之中接觸內墊23、33的部分的冷卻速度，獲得預定強度。In the press-molded articles 8 and 9 thus produced, in order to make the strength of the hot press-molding contact inner pads 23 and 33 to be 1500 MPa or more, the cooling rate of the portion must be 30 ° C/sec or more. However, since the inner pads 23, 33 are small in volume compared to the punches 21, 31 or the dies 22, 32, the temperature tends to rise during hot press forming. In particular, when a plurality of press-molded articles 8 and 9 are continuously produced by repeating the cycle of hot press forming, the inner pads 23 and 33 are easily maintained in a temperature rising state. Then, when hot press forming is performed in a state where the inner pads 23 and 33 are heated, the cooling rate of the portion of the blank 7 contacting the inner pads 23 and 33 is slowed down, and a predetermined strength cannot be obtained. Therefore, in the embodiment of the present invention, by adopting the following configuration of the inner pads 23, 33 and the cooling method, the cooling rate of the portion of the blank 7 contacting the inner pads 23, 33 can be accelerated, and the predetermined strength can be obtained.

內墊23、33的材質並未特別限定，宜是熱傳導率l在30W/mK以上、比熱C在4.3J/g×K以上的材料。該類材料可適用例如工具鋼等。又，如圖3A及圖4所示，於內墊23、33的內部，設有管路狀(亦即空洞狀)的冷媒路徑233、333。冷媒路徑233、333具有可讓水或空氣等流體冷媒流動的構成。冷媒路徑233、333的體積比率W(=冷媒路徑233、333的空間容積(mm ³)/內墊23、33的體積(mm ³))宜為0.01～0.10。又，從內墊頂部231、331到冷媒路徑233、333的深度宜為10～30mm。依據該構成，藉由讓冷媒流動在設於內墊23、33的內部的冷媒路徑233、333，以使內墊頂部231、331的表面溫度(亦即接觸胚料7的面的表面溫度)，在從模具2、3取出壓製成型品8、9到設置下一個胚料7之間，冷卻至後述的預定溫度。 The material of the inner pads 23 and 33 is not particularly limited, and is preferably a material having a thermal conductivity l of 30 W/mK or more and a specific heat C of 4.3 J/g×K or more. Such materials can be applied, for example, to tool steel or the like. Further, as shown in FIG. 3A and FIG. 4, in the inside of the inner pads 23 and 33, the refrigerant paths 233 and 333 which are pipe-shaped (that is, hollow) are provided. The refrigerant paths 233 and 333 have a configuration in which a fluid refrigerant such as water or air can flow. The volume ratio W of the refrigerant paths 233 and 333 (=the volume of the refrigerant paths 233 and 333 (mm ³ ) / the volume of the inner pads 23 and 33 (mm ³ )) is preferably 0.01 to 0.10. Further, the depth from the inner pad tops 231, 331 to the refrigerant paths 233, 333 is preferably 10 to 30 mm. According to this configuration, the surface temperature of the inner pad tops 231, 331 (that is, the surface temperature of the surface contacting the blank 7) is caused by the refrigerant flowing through the refrigerant paths 233, 333 provided inside the inner pads 23, 33. The preforms 8 and 9 are taken out from the molds 2 and 3, and the next billet 7 is placed, and cooled to a predetermined temperature to be described later.

又，內墊23、33的加壓方向尺寸(高度)h，適用以100mm為下限且滿足如下數式(1)的尺寸。 h³100´(t/2.3)´(30/l)´(2/W)´(1/S) 數式(1) 在此， h：內墊的突出尺寸(mm) t：胚料的厚度(mm) l：內墊的熱傳導率(W/mK) W：內墊內部的冷媒路徑的體積比率(mm ³/mm ³) S：冷媒路徑中的冷媒流速(mm/sec) Moreover, the dimension (height) h in the pressing direction of the inner pads 23 and 33 is preferably a size of 100 mm as the lower limit and satisfies the following formula (1). H3100 ́(t/2.3) ́(30/l) ́(2/W) ́(1/S) Equation (1) Here, h: the protruding dimension of the inner pad (mm) t: the thickness of the blank ( Mm) l: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path (mm/sec)

又，內墊頂部231、331(接觸胚料7的表面)的面積是因應製造的壓製成型品8、9的形狀等來規定，可適用例如3000～20000mm ²的範圍，更宜適用5000mm ²程度。藉由如此規定內墊23、33的尺寸，可抑制熱壓成型時內墊23、33的溫度上升，抑制胚料7的冷卻速度降低。亦即，若內墊23、33的體積小，則熱壓成型時由於胚料7的熱能而升溫，胚料7的冷卻速度減慢，唯恐淬火不足。因此，藉由將內墊23、33設為該尺寸，例如若是厚度0.6mm～3.2mm的胚料7，可確保30℃/sec以上的冷卻速度。 Further, the area of the inner pad tops 231 and 331 (the surface contacting the blank 7) is defined by the shape of the press-molded articles 8 and 9 to be produced, and the like, and is applicable, for example, in the range of 3,000 to ^20,000 mm ² , and more preferably to the extent of 5000 mm ² . . By specifying the sizes of the inner pads 23 and 33 in this manner, it is possible to suppress an increase in the temperature of the inner pads 23 and 33 during the hot press forming, and to suppress a decrease in the cooling rate of the billet 7. That is, when the volume of the inner pads 23, 33 is small, the temperature of the blank 7 is raised during hot press forming, and the cooling rate of the blank 7 is slowed down, so that the quenching is insufficient. Therefore, by setting the inner pads 23 and 33 to have such a size, for example, the blank 7 having a thickness of 0.6 mm to 3.2 mm can secure a cooling rate of 30° C./sec or more.

又，如前述，為了使熱壓成型時，接觸內墊23、33的部分的拉伸強度達1500MPa以上，必須使該部分的冷卻速度達30℃/sec以上。因此，熱壓成型開始前(亦即將胚料7設置於模具2、3的時點)，讓冷媒流動在內墊23、33的冷媒路徑233、333進行冷卻，以使內墊頂部231、331的表面溫度T成為預定溫度以下。具體而言，將熱壓成型開始前的內墊頂部231、331的表面溫度T，冷卻為以100℃為上限且滿足如下數式(2)。 T£100´(2.3/t)´(h/100)´(l/30)´(W/2)´S 數式(2) 在此， T：內墊的表面溫度(℃) t：胚料的厚度(mm) h：內墊的突出尺寸(mm) l：內墊的熱傳導率(W/mK) W：內墊內部的冷媒路徑的體積比率(mm ³/mm³)Further, as described above, in order to allow the tensile strength of the portion contacting the inner pads 23 and 33 to be 1500 MPa or more during hot press forming, the cooling rate of the portion must be 30 ° C/sec or more. Therefore, before the hot press forming (that is, when the blank 7 is placed on the molds 2, 3), the refrigerant flows through the refrigerant paths 233, 333 of the inner pads 23, 33 to cool the inner tops 231, 331 of the inner pads. The surface temperature T becomes equal to or lower than a predetermined temperature. Specifically, the surface temperature T of the inner pad tops 231 and 331 before the start of the hot press forming is cooled to an upper limit of 100° C. and satisfies the following formula (2). T£100 ́(2.3/t) ́(h/100) ́(l/30) ́(W/2) ́S Equation (2) Here, T: surface temperature of the inner pad (°C) t: embryo Thickness of material (mm) h: Outburst size of inner pad (mm) l: Thermal conductivity of inner pad (W/mK) W: volume ratio of refrigerant path inside inner pad (mm ³ /mm ³ )

S：冷媒路徑中的冷媒流速(mm/sec)若熱壓成型開始前的內墊頂部231、331的表面溫度T以100℃為上限，且滿足上述數式(2)，則可使熱壓成型時，接觸內墊23、33的部分的拉伸強度達1500MPa以上。 S: the flow rate of the refrigerant in the refrigerant path (mm/sec). If the surface temperature T of the inner pad tops 231, 331 before the start of the hot press forming is the upper limit of 100 ° C, and the above formula (2) is satisfied, the hot pressing can be performed. At the time of molding, the tensile strength of the portion contacting the inner pads 23, 33 is 1500 MPa or more.

然後，藉由重複熱壓成型的循環，來製造複數個壓製成型品8、9時，為了滿足前述溫度條件，必須從模具2、3取出藉由前次的熱壓成型所製造的壓製成型品8、9，到下一個胚料7設置於模具2、3為止，設定用以冷卻內墊23、33的時間(以下稱為「待機時間A」)。於本發明的實施形態，該待機時間A是以5秒為下限且由以下數式(3)所示的時間。 Then, when a plurality of press-molded articles 8 and 9 are produced by repeating the cycle of hot press forming, in order to satisfy the above temperature conditions, it is necessary to take out the press-molded articles produced by the previous hot press forming from the molds 2 and 3. 8 and 9, the time for cooling the inner pads 23, 33 (hereinafter referred to as "standby time A") is set until the next blank 7 is placed in the molds 2, 3. In the embodiment of the present invention, the standby time A is a time represented by the following formula (3) with a lower limit of 5 seconds.

在此， here,

A：待機時間(sec) A: Standby time (sec)

t：胚料的厚度(mm) t: thickness of the billet (mm)

h：內墊的突出尺寸(mm) h: protruding size of the inner pad (mm)

S：冷媒路徑中的冷媒流速(mm/sec)藉此，可使熱壓成型開始前的內墊頂部231、331的表面溫度T，成為上述溫度。 S: The flow rate (mm/sec) of the refrigerant in the refrigerant path is such that the surface temperature T of the inner pad tops 231 and 331 before the start of the hot press forming can be the above temperature.

<熱壓系統> <Hot Press System>

接著，說明可實施本發明實施形態的熱壓系統1的構成例。圖5是模式性表示熱壓系統1的構成例的圖。如圖5所示，熱壓系統1的構成包含：壓機11，其使用模具2、3將胚料7予以熱壓成型；加壓控制部12，其控制壓機11；內墊冷卻機構13，其冷卻內墊23、33；及冷卻控制部14，其控制內墊冷卻機構13。壓機11的模具2、3若在製造第1壓製成型品8時，適用第1模具2，若在製造第2壓製成型品9時，適用第2模具3。進而言之，熱壓系統1亦可具有工件搬送機構15，其對模具2、3設置胚料7並從模具取出已成型的壓製成型品8、9；及工件搬送控制部16，其控制工件搬送機構15。Next, a configuration example of a hot press system 1 according to an embodiment of the present invention can be described. FIG. 5 is a view schematically showing a configuration example of the hot press system 1. As shown in Fig. 5, the configuration of the hot press system 1 includes a press 11 which press-forms the billet 7 using the molds 2, 3, a pressurization control unit 12 which controls the press 11 and an inner pad cooling mechanism 13 The cooling inner pads 23, 33 and the cooling control portion 14 control the inner pad cooling mechanism 13. When the first press-molded product 8 is used in the molds 2 and 3 of the press 11, the first mold 2 is applied, and when the second press-molded product 9 is produced, the second mold 3 is applied. Further, the hot press system 1 may further include a workpiece transfer mechanism 15 that sets the blanks 7 to the molds 2, 3 and takes out the formed press-formed products 8, 9 from the mold; and the workpiece transfer control portion 16, which controls the workpiece Transport mechanism 15.

壓機11若是可使用模具2、3，將胚料7予以熱壓成型的構成即可，具體構成並未特別限定。壓機11可適用習知的各種壓機。工件搬送機構15若可對模具2、3設置胚料7，並從模具2、3取出已成型的壓製成型品8、9即可，具體構成並未特別限定。例如工件搬送機構15可適用習知的各種搬送裝置或搬送機器人等。The press 11 may have a configuration in which the blanks 7 can be formed by using the molds 2 and 3, and the blank 7 is not particularly limited. The press 11 can be applied to various conventional presses. The workpiece transfer mechanism 15 may be provided with the blanks 7 for the molds 2 and 3, and the formed press-molded articles 8 and 9 may be taken out from the molds 2 and 3, and the specific configuration is not particularly limited. For example, various types of conveying apparatuses, conveying robots, and the like can be applied to the workpiece conveying mechanism 15.

內墊冷卻機構13的構成包含：內墊23、33的冷媒路徑233、333；設置於衝模22、32的冷媒噴射孔223、323；及對冷媒路徑233、333與冷媒噴射孔223、323供給冷媒的冷媒供給源131。於本發明的實施形態，冷媒可適用水或空氣等流體。再者，冷媒的溫度可為常溫(室溫)，但亦可使用溫度冷卻至低於常溫的冷媒。此時，內墊冷卻機構13進一步具有冷卻冷媒的冷媒冷卻機構。於本發明的實施形態，冷卻控制部14藉由控制冷媒供給，來控制內墊23、33的冷卻。例如冷卻控制部14控制對內墊23、33的冷媒路徑233、333，供給冷媒的時序及冷媒的流速，並控制從衝模22、32的冷媒噴射孔223、323噴射冷媒的時序及噴射的冷媒量。The inner pad cooling mechanism 13 includes refrigerant paths 233 and 333 of the inner pads 23 and 33, refrigerant injection holes 223 and 323 provided in the dies 22 and 32, and supply of the refrigerant paths 233 and 333 and the refrigerant injection holes 223 and 323. The refrigerant supply source 131 of the refrigerant. In the embodiment of the present invention, a fluid such as water or air can be applied to the refrigerant. Further, the temperature of the refrigerant may be normal temperature (room temperature), but it may be cooled to a temperature lower than normal temperature using a temperature. At this time, the inner pad cooling mechanism 13 further has a refrigerant cooling mechanism that cools the refrigerant. In the embodiment of the present invention, the cooling control unit 14 controls the cooling of the inner pads 23 and 33 by controlling the supply of the refrigerant. For example, the cooling control unit 14 controls the timing of supplying the refrigerant to the refrigerant paths 233 and 333 of the inner pads 23 and 33, and the flow rate of the refrigerant, and controls the timing of injecting the refrigerant from the refrigerant injection holes 223 and 323 of the dies 22 and 32 and the injected refrigerant. the amount.

再者，內墊冷卻機構13不限定於冷媒噴射孔223、323設置在衝模22、32的構成。在此，說明內墊冷卻機構13的其他構成例。圖6是模式性表示內墊冷卻機構13的其他構成例的圖。如圖6所示，內墊冷卻機構13具有冷媒噴射噴嘴132，來作為噴射冷媒的冷媒噴射部，以取代設置於衝模22、32的冷媒噴射孔223、323。冷媒噴射噴嘴132(冷媒噴射部)設置於模具2、3附近，以便可朝向內墊23、33噴射冷媒。此時，冷卻控制部14控制從冷媒噴射噴嘴132噴射冷媒的時序及噴射量。再者，冷媒噴射噴嘴132的具體構成並未特別限定，可適用習知的各種噴嘴。又，冷媒噴射噴嘴132亦可採可動式，其可藉由移動機構來移動。此時，移動機構依照冷卻控制部14的控制，在對內墊23、33噴射冷媒時，使冷媒噴射噴嘴132接近內墊23、33，在進行熱壓成型時，使冷媒噴射噴嘴132退避，以免干擾模具2、3。如此，對內墊23、33噴射冷媒的冷媒噴射部採用設置於模具2、3的構成，或有別於模具2、3而另外設置的構成均可。Further, the inner pad cooling mechanism 13 is not limited to the configuration in which the refrigerant injection holes 223 and 323 are provided in the dies 22 and 32. Here, another configuration example of the inner pad cooling mechanism 13 will be described. FIG. 6 is a view schematically showing another configuration example of the inner pad cooling mechanism 13. As shown in FIG. 6, the inner pad cooling mechanism 13 has a refrigerant injection nozzle 132 as a refrigerant injection portion for injecting a refrigerant, instead of the refrigerant injection holes 223 and 323 provided in the dies 22 and 32. The refrigerant injection nozzle 132 (refrigerant injection portion) is provided in the vicinity of the molds 2, 3 so that the refrigerant can be sprayed toward the inner pads 23, 33. At this time, the cooling control unit 14 controls the timing at which the refrigerant is injected from the refrigerant injection nozzle 132 and the injection amount. Further, the specific configuration of the refrigerant injection nozzle 132 is not particularly limited, and various conventional nozzles can be applied. Further, the refrigerant injection nozzle 132 can also be movable, which can be moved by a moving mechanism. At this time, the moving mechanism causes the refrigerant injection nozzle 132 to approach the inner pads 23 and 33 when the refrigerant is injected into the inner pads 23 and 33 in accordance with the control of the cooling control unit 14, and the refrigerant injection nozzle 132 is retracted during the hot press forming. So as not to interfere with the molds 2, 3. In this manner, the refrigerant ejecting portion that ejects the refrigerant to the inner pads 23 and 33 may be configured to be provided in the molds 2 and 3, or may be provided separately from the molds 2 and 3.

於加壓控制部12、冷卻控制部14及工件搬送控制部16，分別適用具有電腦的裝置，其中該電腦包含CPU、ROM及RAM。在加壓控制部12的電腦的ROM，事先儲存有用來控制壓機的電腦程式。然後，CPU讀出儲存於ROM的電腦程式，並將RAM作為工作區使用而執行。藉此控制壓機11。關於冷卻控制部14及工件搬送控制部16亦同。然後，藉由加壓控制部12、冷卻控制部14及工件搬送控制部16的電腦協同動作，來執行本發明的實施形態的熱壓法。A device having a computer including a CPU, a ROM, and a RAM is applied to each of the pressurization control unit 12, the cooling control unit 14, and the workpiece transfer control unit 16. A computer program for controlling the press is stored in advance in the ROM of the computer of the pressurization control unit 12. Then, the CPU reads out the computer program stored in the ROM and executes the RAM as a work area. Thereby the press 11 is controlled. The same applies to the cooling control unit 14 and the workpiece transfer control unit 16. Then, the hot press method according to the embodiment of the present invention is executed by the cooperation of the computer of the pressurization control unit 12, the cooling control unit 14, and the workpiece transport control unit 16.

＜熱壓法＞接著，說明本發明的實施形態的熱壓法。圖7A～圖7E是模式性表示使用第1模具2的熱壓法的剖面圖。圖8A～圖8E是模式性表示使用第2模具3的熱壓法的剖面圖。<Hot Pressing Method> Next, a hot press method according to an embodiment of the present invention will be described. 7A to 7E are cross-sectional views schematically showing a hot pressing method using the first mold 2. 8A to 8E are cross-sectional views schematically showing a hot pressing method using the second mold 3.

於本實施形態，在設置於模具2、3的時序，使胚料7的溫度在700～950℃的溫度範圍，更宜在約750℃。又，在胚料7設置於模具2、3的時序，使模具2、3的表面溫度在100℃以下。尤其是內墊頂部231、331的表面溫度T如前述，設為以100℃為上限且滿足前述數式(2)的溫度。藉此，可使熱壓成型時的胚料7的冷卻速度達30℃/sec以上，可製造具預定的機械強度的壓製成型品8、9。In the present embodiment, at the timing set in the molds 2, 3, the temperature of the billet 7 is in the temperature range of 700 to 950 ° C, more preferably about 750 ° C. Further, at the timing when the blank 7 is placed on the molds 2 and 3, the surface temperatures of the molds 2 and 3 are set to 100 ° C or lower. In particular, as described above, the surface temperature T of the inner pad tops 231 and 331 is set to an upper limit of 100° C. and satisfies the temperature of the above formula (2). Thereby, the cooling rate of the billet 7 at the time of hot press forming can be made 30 ° C /sec or more, and the press-molded products 8 and 9 with predetermined mechanical strength can be manufactured.

首先，說明使用第1模具2的情況。如圖7A所示，在加壓成型開始前的時序，內墊23由賦予勢能機構24維持在從衝頭頂部212，突出預定尺寸的狀態。因此，於熱壓成型開始前的時序，設置於第1模具2的胚料7之中成為第1壓製成型品8的稜線部82及縱壁部83的部分，維持在不接觸衝頭頂部212的狀態。因此，防止或抑制在熱壓成型開始前，該部分溫度降低。First, the case where the first mold 2 is used will be described. As shown in FIG. 7A, at the timing before the start of press molding, the inner pad 23 is maintained in a state of being protruded from the punch top portion 212 by the given potential energy mechanism 24 by a predetermined size. Therefore, at the timing before the start of the hot press forming, the portion of the blank 7 provided in the first die 2 that is the ridge line portion 82 and the vertical wall portion 83 of the first press-molded article 8 is maintained at the top of the punchless contact 212. status. Therefore, it is prevented or suppressed that the temperature of the portion is lowered before the start of hot press forming.

接著，如圖7B所示，加壓控制部12控制壓機11，使衝模22接近衝頭21。當衝模22接近衝模21，衝模肩R角部222接觸胚料7。胚料7的該部分稱為「衝模肩接觸部71」。其中，在衝模肩R角部222剛接觸胚料7的衝模肩接觸部71後的時序，胚料7之與內墊肩R角部232接觸的部分(該部分稱為「內墊肩接觸部72」)與衝模肩接觸部71之間的部分(該部分稱為「非接觸部73」)，處於未接觸衝頭21及衝模22雙方的狀態。因此，防止或抑制該非接觸部73的溫度降低。然後，胚料7由內墊23支撐於較衝頭頂部212接近衝模22的位置，藉由該構成，可加大胚料7的衝模肩接觸部71與內墊肩接觸部72的距離，加大非接觸部73的範圍，亦即可加大防止或抑制溫度降低部分的範圍。Next, as shown in FIG. 7B, the pressurization control unit 12 controls the press 11 to bring the die 22 close to the punch 21. When the die 22 approaches the die 21, the die shoulder R corner 222 contacts the blank 7. This portion of the blank 7 is referred to as "die shoulder contact portion 71". Here, at the timing immediately after the die shoulder R corner portion 222 is in contact with the die shoulder contact portion 71 of the blank 7, the portion of the blank 7 that is in contact with the inner shoulder R corner portion 232 (this portion is referred to as "inner pad shoulder contact portion 72" The portion between the die shoulder contact portion 71 (this portion is referred to as "non-contact portion 73") is in a state where both the punch 21 and the die 22 are not contacted. Therefore, the temperature drop of the non-contact portion 73 is prevented or suppressed. Then, the blank 7 is supported by the inner pad 23 at a position closer to the die 22 than the punch top 212. With this configuration, the distance between the die shoulder contact portion 71 of the blank 7 and the inner pad shoulder contact portion 72 can be increased, and the distance is increased. The range of the non-contact portion 73 can also increase the range of preventing or suppressing the temperature-reducing portion.

圖7C表示衝模22位於下死點的時序。若衝模22從圖7B所示時序的狀態，進一步接近衝頭21，則如圖7C所示，胚料7的非接觸部73被推至衝頭頂部212及衝頭肩R角部213。又，隨著衝模22接近衝頭21，內墊23受到推壓，內墊23從衝頭頂部212的突出尺寸變小。若衝模22到達下死點，則內墊頂部231與衝頭頂部212高度相同，成為衝頭頂部212的一部分。然後，非接觸部73成為第1壓製成型品8的稜線部82及縱壁部83，並且藉由接觸衝頭頂部212及衝頭肩R角部213而冷卻並淬火。再者，胚料7的衝模肩接觸部71藉由接觸衝模肩R角部222而冷卻並淬火，內墊肩接觸部72並非接觸衝頭肩R角部213，藉由接觸內墊肩R角部232及其附近而冷卻並淬火。Fig. 7C shows the timing at which the die 22 is at the bottom dead center. If the die 22 is further approached from the state shown in FIG. 7B, the non-contact portion 73 of the blank 7 is pushed to the punch top 212 and the punch shoulder R corner portion 213 as shown in FIG. 7C. Further, as the die 22 approaches the punch 21, the inner pad 23 is pressed, and the inner pad 23 becomes smaller from the protruding size of the punch top 212. If the die 22 reaches the bottom dead center, the inner pad top 231 and the punch top 212 are the same height and become part of the punch top 212. Then, the non-contact portion 73 becomes the ridge portion 82 and the vertical wall portion 83 of the first press-molded article 8, and is cooled and quenched by contacting the punch top portion 212 and the punch shoulder R corner portion 213. Furthermore, the die shoulder contact portion 71 of the blank 7 is cooled and quenched by contact with the die shoulder R corner portion 222, and the inner pad shoulder contact portion 72 does not contact the punch shoulder R corner portion 213 by contacting the inner shoulder pad R corner portion 232. It is cooled and quenched in the vicinity.

如此，內墊頂部231在熱壓成型開始時，從衝頭頂部212往接近衝模22側，突出預定尺寸，隨著衝模22接近衝頭21，經由胚料7被往衝模22推壓，突出尺寸變小，若衝模22到達下死點，則成為衝頭頂部212的一部分。然後，於本發明的實施形態的熱壓法，藉由一面以內墊23支撐胚料7，一面使衝模22接近衝頭21，來製造第1壓製成型品8。Thus, at the beginning of the hot press forming, the inner pad top portion 231 protrudes from the punch top portion 212 toward the die 22 side by a predetermined size, and as the die 22 approaches the punch 21, it is pushed toward the die 22 via the blank 7 to protrude the size. It becomes smaller, and if the die 22 reaches the bottom dead center, it becomes a part of the punch top 212. Then, in the hot press method according to the embodiment of the present invention, the first press-molded article 8 is produced by supporting the blank 7 with the inner pad 23 while bringing the die 22 close to the punch 21.

接著，如圖7D所示，加壓控制部12控制壓機11，使衝模22移動至上死點。然後，工件搬送機構15依照工件搬送控制部16的控制，從第1模具2取出製造的第1壓製成型品8。其後，如圖7E所示，加壓控制部12控制壓機11，使衝模22接近衝頭21，於該狀態下，冷卻控制部14從設置於衝模22的冷媒噴射孔223噴射冷媒來冷卻內墊23。於本發明的實施形態，內墊頂部231的表面溫度T冷卻至以100℃為上限且滿足前述數式(2)所示的溫度。噴射冷媒時，使衝模22接近內墊23(從上死點往下死點側移動)，藉此可提高內墊頂部231表面的冷媒流速，縮短內墊頂部231冷卻至前述溫度的時間。內墊頂部231冷卻後，加壓控制部12控制壓機11，使衝模22移動至上死點。藉此，完成熱壓成型的一循環。Next, as shown in Fig. 7D, the pressurization control unit 12 controls the press 11 to move the die 22 to the top dead center. Then, the workpiece conveyance mechanism 15 takes out the manufactured first press-molded article 8 from the first mold 2 in accordance with the control of the workpiece conveyance control unit 16. Then, as shown in FIG. 7E, the pressurization control unit 12 controls the press 11 to bring the die 22 closer to the punch 21. In this state, the cooling control unit 14 injects the refrigerant from the refrigerant injection hole 223 provided in the die 22 to cool it. Inner pad 23. In the embodiment of the present invention, the surface temperature T of the inner pad top portion 231 is cooled to an upper limit of 100 ° C and satisfies the temperature indicated by the above formula (2). When the refrigerant is injected, the die 22 is brought close to the inner pad 23 (moving from the top dead center to the bottom dead center side), whereby the flow rate of the refrigerant on the surface of the inner pad top 231 can be increased, and the time during which the inner pad top portion 231 is cooled to the aforementioned temperature can be shortened. After the inner pad top portion 231 is cooled, the pressurization control portion 12 controls the press 11 to move the die 22 to the top dead center. Thereby, a cycle of hot press forming is completed.

然後，工件搬送機構15依照工件搬送控制部16的控制，使待機時間A以5秒為下限且滿足前述數式(3)時，於第1模具2設置下一個胚料7。藉此，於第1模具2的表面溫度在100℃以下，尤其在內墊頂部231的表面溫度T冷卻至以100℃為上限且滿足前述數式(2)所示溫度的狀態下，於第1模具2設置下一個胚料7。因此，將下一個胚料7予以熱壓成型時，可使接觸內墊頂部231的部分的冷卻溫度達30℃/sec以上，可製造具預定強度(在此為1500MPa以上)的強度的第1壓製成型品8。Then, the workpiece transport mechanism 15 sets the next blank 7 in the first mold 2 when the standby time A is 5 seconds as the lower limit and the numerical formula (3) is satisfied in accordance with the control of the workpiece transport control unit 16. With this, the surface temperature of the first mold 2 is 100° C. or lower, and in particular, the surface temperature T of the inner pad top 231 is cooled to a temperature of 100° C. and satisfies the temperature expressed by the above formula (2). 1 Mold 2 sets the next blank 7 . Therefore, when the next blank 7 is subjected to hot press forming, the cooling temperature of the portion contacting the inner pad top 231 can be made 30 ° C /sec or more, and the first strength of the predetermined strength (here, 1500 MPa or more) can be produced. Press molded product 8.

接著，說明使用第2模具3的例子。再者，關於與使用第1模具2的方法相同的方法，則省略說明。圖8A對應於圖7A，表示熱壓成型開始前的時序，胚料7設置於第2模具3的狀態。如圖8A所示，於熱壓成型開始前的時序，內墊33由賦予勢能機構34維持在從衝頭低頂部317，朝向衝模32側突出預定尺寸的狀態。藉此，於熱壓成型開始前的時序，設置於第2模具3的胚料7之中成為第2壓製成型品9的稜線部92及縱壁部93的部分(尤其是縱壁部93之中接近頂板階差部913的部分)，維持在不接觸衝頭低頂部317的狀態，防止或抑制在熱壓成型開始前的溫度降低。Next, an example in which the second mold 3 is used will be described. In addition, about the same method as the method of using the 1st metal mold|die 2, it abbreviate|omits description. FIG. 8A corresponds to FIG. 7A and shows the timing before the start of hot press forming, and the blank 7 is placed in the state of the second mold 3. As shown in FIG. 8A, at the timing before the start of the hot press forming, the inner pad 33 is maintained by the energizing potential mechanism 34 in a state of protruding from the lower end 317 of the punch toward the die 32 side by a predetermined size. In this way, the ridge line portion 92 and the vertical wall portion 93 of the second press-molded product 9 are provided in the blank 7 of the second metal mold 3 at the timing before the start of the hot press forming (in particular, the vertical wall portion 93) The portion close to the top step portion 913 is maintained in a state where it does not contact the lower top portion 317 of the punch, and prevents or suppresses a temperature drop before the start of thermoforming.

如圖8B所示，加壓控制部12控制壓機11，使衝模32接近衝頭31。當衝模32接近衝模31，衝模肩R角部322接觸胚料7的預定部分(衝模肩接觸部71)。如圖示，胚料7在到達下死點前，由內墊頂部331及衝模32壓住。因此，可將位於衝頭高頂部316的胚料，在到達下死點前拉入衝頭低頂部317。藉此，可減低在下死點附近，在成型於頂板低部912的稜線部92與縱壁部93的胚料所產生，與加壓方向P呈直角方向的張力(紙面左右方向的張力)。As shown in FIG. 8B, the pressurization control unit 12 controls the press 11 to bring the die 32 close to the punch 31. When the die 32 approaches the die 31, the die shoulder R corner 322 contacts a predetermined portion of the blank 7 (die shoulder contact portion 71). As shown, the blank 7 is pressed by the inner pad top 331 and the die 32 before reaching the bottom dead center. Thus, the blank at the top 316 of the punch can be pulled into the lower top 317 of the punch before reaching the bottom dead center. Thereby, it is possible to reduce the tension generated in the direction perpendicular to the pressing direction P (the tension in the left-right direction of the paper surface) in the vicinity of the bottom dead center in the ridge portion 92 and the vertical wall portion 93 formed in the lower portion 912 of the top plate.

圖8C表示衝模32位於下死點的時序。若衝模32從圖8B所示時序的狀態，進一步接近衝頭31，如圖8C所示，若衝模32到達下死點，則內墊頂部331與衝頭低頂部317高度相同，成為衝頭低頂部317的一部分。Fig. 8C shows the timing at which the die 32 is at the bottom dead center. If the die 32 is closer to the punch 31 from the state of the timing shown in FIG. 8B, as shown in FIG. 8C, if the die 32 reaches the bottom dead center, the inner pad top 331 and the lower punch top 317 have the same height, which becomes a low punch. Part of the top 317.

圖8D是對應於圖7D的圖。如圖8D所示，加壓控制部12控制壓機11，使衝模32移動至上死點。然後，工件搬送機構15依照工件搬送控制部16的控制，從第2模具3取出製造的第2壓製成型品9。Fig. 8D is a view corresponding to Fig. 7D. As shown in Fig. 8D, the pressurization control unit 12 controls the press 11 to move the die 32 to the top dead center. Then, the workpiece conveyance mechanism 15 takes out the manufactured second press-molded product 9 from the second mold 3 in accordance with the control of the workpiece conveyance control unit 16.

其後，如圖8E(圖8E是對應於圖7E的圖)所示，加壓控制部12控制壓機11，使衝模32接近衝頭31(從上死點移至下死點側)，於該狀態下，冷卻控制部14從設置於衝模32的冷媒噴射孔323噴射冷媒來冷卻內墊33。冷卻溫度與使用第1模具2時相同。內墊33冷卻後，加壓控制部12控制壓機11，使衝模32移動至上死點。藉此，完成熱壓成型的一循環。Thereafter, as shown in Fig. 8E (Fig. 8E is a view corresponding to Fig. 7E), the pressurization control unit 12 controls the press 11 to bring the die 32 close to the punch 31 (from the top dead center to the bottom dead center side), In this state, the cooling control unit 14 injects the refrigerant from the refrigerant injection hole 323 provided in the die 32 to cool the inner pad 33. The cooling temperature is the same as that in the case of using the first mold 2. After the inner pad 33 is cooled, the pressurization control unit 12 controls the press 11 to move the die 32 to the top dead center. Thereby, a cycle of hot press forming is completed.

然後，熱壓成型的循環完成後，執行下一熱壓成型的循環。再者，待機時間A與使用第1模具2時相同。藉由該方法，發揮與使用第1模具2時相同的效果。Then, after the cycle of the hot press forming is completed, the cycle of the next hot press forming is performed. Further, the standby time A is the same as that when the first mold 2 is used. According to this method, the same effects as those in the case of using the first mold 2 are exhibited.

＜藉由內墊抑制裂開＞接著，與使用不具有內墊23、33的比較例的模具5、6的例子對比，來說明內墊23、33的壓製成型品8、9的裂開抑制功能。若形成為諸如第1壓製成型品8的帽型，且具有曲部84的形狀，於曲部84的外周側的縱壁部83容易發生裂開。又，若如第2壓製成型品9，於帽型的頂板部91設有頂板階差部913的形狀，則於縱壁部93之中接近頂板階差部913的部分，容易發生裂開。該等部分具有如下特徵(i)～(iii)。 (i)熱壓成型中，張力不僅加施於加壓方向P，亦加施在與加壓方向P呈直角的方向。 (ii)由於未接觸模具2、3，故維持在高溫。 (iii)被模具2、3的衝模肩R角部222與衝頭肩R角部213夾住。<Suppression of cracking by the inner pad> Next, the crack suppression of the press-molded articles 8 and 9 of the inner pads 23 and 33 will be described in comparison with the example of the molds 5 and 6 of the comparative example having no inner pads 23 and 33. Features. When formed into a hat shape such as the first press-molded article 8 and has the shape of the curved portion 84, the vertical wall portion 83 on the outer peripheral side of the curved portion 84 is likely to be cracked. Further, when the second press-molded article 9 is provided with the shape of the top step portion 913 in the hat-shaped top plate portion 91, the portion of the vertical wall portion 93 that is close to the top step portion 913 is likely to be cracked. These parts have the following features (i) to (iii). (i) In the hot press forming, the tension is applied not only to the pressing direction P but also to a direction perpendicular to the pressing direction P. (ii) Since it is not in contact with the molds 2 and 3, it is maintained at a high temperature. (iii) being sandwiched by the die shoulder R corner portion 222 of the molds 2, 3 and the punch shoulder R corner portion 213.

然後，於第1壓製成型品8，熱壓成型時，變形會集中在曲部84的外周側的縱壁部83。又，於第2壓製成型品9，熱壓成型時，變形會集中在接近縱壁部93之中的頂板階差部913(頂板部91的高度變化的部分)的部分。因此，在該等部分，板厚減少率變高，容易發生裂開。因此，於本發明的實施形態的熱壓法，藉由使用內墊23、33，於胚料7之中成為曲部84的外周側的縱壁部83的部分、或縱壁部93之中成為接近頂板階差部913部分的部分，擴大防止或抑制溫度降低的範圍。藉此，抑制變形集中在局部，防止或抑制發生裂開。Then, at the time of hot press forming of the first press-molded article 8, the deformation is concentrated on the vertical wall portion 83 on the outer peripheral side of the curved portion 84. In the second press-molded article 9, at the time of hot press forming, the deformation is concentrated on a portion close to the top step portion 913 (the portion where the height of the top plate portion 91 changes) of the vertical wall portion 93. Therefore, in these portions, the plate thickness reduction rate becomes high, and cracking easily occurs. Therefore, in the hot press method according to the embodiment of the present invention, the inner pad 23, 33 is used as the portion of the vertical wall portion 83 on the outer peripheral side of the curved portion 84 or the vertical wall portion 93 among the blanks 7. The portion which is close to the portion of the top step portion 913 is expanded to prevent or suppress the range in which the temperature is lowered. Thereby, the deformation is suppressed from being concentrated locally, and cracking is prevented or suppressed.

圖9是第1比較例的模具5的構成例的剖面圖，且是模式性表示不具有內墊23的模具的構成例。再者，對與第1模具2共通的構成，標示相同符號，並省略說明。如圖9所示，於第1比較例的模具5的衝頭51，未設置內墊23，於衝模52未設置冷媒噴射孔223。除此之外均適用與第1模具2相同的構成。FIG. 9 is a cross-sectional view showing a configuration example of the mold 5 of the first comparative example, and is a configuration example schematically showing a mold having no inner pad 23. The same components as those of the first mold 2 are denoted by the same reference numerals and will not be described. As shown in FIG. 9, in the punch 51 of the mold 5 of the first comparative example, the inner pad 23 is not provided, and the refrigerant injection hole 223 is not provided in the die 52. Other than this, the same configuration as that of the first mold 2 is applied.

若使用不具有內墊23的第1比較例的模具5，來製造第1壓製成型品8時，胚料7是在由衝頭頂部212支撐的狀態下被予以熱壓成型。然後，胚料7的衝模肩接觸部71藉由接觸衝模肩R角部222而冷卻，衝頭肩接觸部74(胚料7之中接觸衝頭肩R角部213的部分)藉由接觸衝頭肩R角部213而冷卻。若採用該構成，相較於使用具有內墊23的第1模具2的方法，衝模肩接觸部71與衝頭肩接觸部74之間的非接觸部73的範圍窄。亦即，抑制溫度降低的部分的範圍窄。然後，變形集中於該小範圍，因此板厚減少率變高，容易發生裂開。進而言之，若於第1壓製成型品8設置曲部84而構成，顯著發生變形集中於位在縱壁部83的曲部84的部分。此係由於當稜線部82在加壓方向視點看來呈彎曲時，在熱壓成型時，胚料7的流動會變得不均。When the first press-molded article 8 is produced using the mold 5 of the first comparative example having no inner pad 23, the blank 7 is hot-pressed in a state of being supported by the punch top portion 212. Then, the die shoulder contact portion 71 of the blank 7 is cooled by contacting the die shoulder R corner portion 222, and the punch shoulder contact portion 74 (the portion of the billet 7 that contacts the punch shoulder R corner portion 213) is contact-punched. The head and shoulder R corners 213 are cooled. According to this configuration, the range of the non-contact portion 73 between the die shoulder contact portion 71 and the punch shoulder contact portion 74 is narrower than that of the first mold 2 having the inner pad 23. That is, the range in which the temperature reduction is suppressed is narrow. Then, the deformation is concentrated in the small range, so the plate thickness reduction rate becomes high, and cracking easily occurs. In other words, when the curved portion 84 is provided in the first press-molded article 8, the deformation is concentrated on the portion of the curved portion 84 of the vertical wall portion 83. This is because when the ridge portion 82 is bent as viewed from the viewpoint of the pressurizing direction, the flow of the billet 7 becomes uneven at the time of hot press forming.

相對於此，如圖7B所示，於本發明的實施形態，使用具有內墊23的第1模具2，藉由內墊23將胚料7之中成為頂板部81的部分支撐在，從衝頭頂部212往衝模22側突出預定尺寸的位置。於該狀態，在加壓方向視點看來，衝模肩R角部222與內墊肩R角部232的距離，大於衝模肩R角部222與衝頭肩R角部213的距離。若採該構成，相較於第1比較例的模具5，可增大非接觸部73的範圍。On the other hand, as shown in FIG. 7B, in the embodiment of the present invention, the first mold 2 having the inner pad 23 is used, and the inner pad 23 supports the portion of the blank 7 which becomes the top plate portion 81. The head top portion 212 protrudes toward the die 22 side by a predetermined size. In this state, the distance between the die shoulder R angle portion 222 and the inner shoulder R angle portion 232 is larger than the distance between the die shoulder R corner portion 222 and the punch shoulder R corner portion 213 from the viewpoint of the pressurizing direction. According to this configuration, the range of the non-contact portion 73 can be increased as compared with the mold 5 of the first comparative example.

然後，一面維持該狀態，一面使衝頭21與衝模22相對地接近而夾模，製造第1壓製成型品8。此時，胚料7的衝模肩接觸部71藉由接觸衝模肩R角部222而冷卻，內墊肩接觸部72並非藉由接觸衝頭肩R角部213而冷卻，其藉由接觸內墊肩R角部232而冷卻。依據該構成，可增大非接觸部73(亦即防止或抑制溫度降低的部分)的範圍的範圍，因此在胚料7之中成為曲部84的部分，抑制熱壓成型時變形集中。因此，減少板厚減少率，抑制發生裂開。Then, while maintaining the state, the punch 21 and the die 22 are relatively close to each other and clamped, whereby the first press-molded article 8 is produced. At this time, the die shoulder contact portion 71 of the blank 7 is cooled by contacting the die shoulder R corner portion 222, and the inner pad shoulder contact portion 72 is not cooled by contacting the punch shoulder R corner portion 213 by contacting the inner shoulder pad R The corners 232 are cooled. According to this configuration, the range of the range of the non-contact portion 73 (that is, the portion that prevents or suppresses the temperature drop) can be increased. Therefore, the portion of the billet 7 that becomes the curved portion 84 suppresses the concentration of deformation during hot press forming. Therefore, the plate thickness reduction rate is reduced, and cracking is suppressed.

圖10A及圖10B是表示製造第1壓製成型品8時依據板厚減少率的數值分析的等高線圖。分別而言，圖10A表示使用第1模具2的情況，圖10B表示使用第1比較例的模具5的情況。又，圖中以四角圍住的數值表示板厚減少率。圖10C及圖10D是表示製造第1壓製成型品8時依據各部溫度的數值分析的等高線圖。分別而言，圖10C表示使用第1模具2的情況，圖10D表示使用第1比較例的模具5的情況。於圖10C及圖10D，塗黑底的區域表示衝模22位於下死點上方10mm的狀態下，溫度為650℃以上的區域。10A and 10B are contour maps showing numerical analysis of the thickness reduction rate when the first press-molded article 8 is produced. In each case, FIG. 10A shows a case where the first mold 2 is used, and FIG. 10B shows a case where the mold 5 of the first comparative example is used. Moreover, the numerical value enclosed by the four corners in the figure indicates the plate thickness reduction rate. 10C and 10D are contour maps showing numerical analysis of the temperature of each part when the first press-molded article 8 is manufactured. In each case, FIG. 10C shows a case where the first mold 2 is used, and FIG. 10D shows a case where the mold 5 of the first comparative example is used. In FIGS. 10C and 10D, the black-coated region indicates a region in which the die 22 is located at 10 mm above the bottom dead center and has a temperature of 650 ° C or higher.

對比圖10A與圖10B、以及圖10C與圖10D可得知，藉由熱壓成型製造第1壓製成型品8時，若藉由使用第1模具2的方法，相較於使用第1比較例的模具5的方法，在縱壁部83之中位於曲部84的部分，可擴大抑制溫度降低的部分的範圍。如此，可緩和變形集中於局部，抑制板厚減少率，可防止或抑制縱壁部83的曲部84發生裂開。10A and FIG. 10B, and FIG. 10C and FIG. 10D, it can be seen that when the first press-molded article 8 is produced by hot press forming, the method of using the first die 2 is compared with the use of the first comparative example. In the method of the mold 5, the portion of the vertical wall portion 83 located at the curved portion 84 can expand the range of the portion where the temperature drop is suppressed. In this way, the deformation can be concentrated locally, and the reduction rate of the thickness can be suppressed, and the cracking of the curved portion 84 of the vertical wall portion 83 can be prevented or suppressed.

再者，於本發明的實施形態，第1壓製成型品8具有在加壓方向視點看來呈彎曲的曲部84，並表示於該曲部84，防止或抑制發生裂開的方法，但即使是該類形狀以外的壓製成型品，仍可防止或抑制發生裂開。例如本發明的實施形態的熱壓法亦可適用於製造具有在加壓方向視點看來，呈圓形、橢圓形、多角形等環狀稜線部的壓製成型品；該等形狀的成型品亦可防止或抑制發生裂開。Further, in the embodiment of the present invention, the first press-molded article 8 has a curved portion 84 which is curved in the direction of the pressurization direction, and is shown in the curved portion 84, and prevents or suppresses the occurrence of cracking, but even It is a press-formed product other than this type of shape, and it can prevent or suppress the occurrence of cracking. For example, the hot press method according to the embodiment of the present invention can be applied to a press-formed product having an annular ridge portion such as a circular shape, an elliptical shape, or a polygonal shape as viewed from the viewpoint of the pressurization direction; It can prevent or inhibit the occurrence of cracking.

圖11是模式性表示第2比較例的模具6的構成例的圖，表示不具有內墊33的模具例。如圖11所示，於第2比較例的模具6的衝頭61，未設置內墊33，於衝模62未設置冷媒噴射孔323。FIG. 11 is a view schematically showing a configuration example of the mold 6 of the second comparative example, and shows an example of a mold having no inner pad 33. As shown in Fig. 11, in the punch 61 of the mold 6 of the second comparative example, the inner pad 33 is not provided, and the refrigerant injection hole 323 is not provided in the die 62.

如圖11所示，若使用第2比較例的模具6來製造第2壓製成型品9，衝頭高頂部316比衝頭低頂部317先接觸胚料7，頂板高部911比頂板低部912先形成。然後，於熱壓成型進展，衝頭低頂部317接觸胚料7的時點，胚料7受到成型的衝頭高頂部316限制。因此，於縱壁部93之中接近頂板階差部913的部分，材料流入不足，於紙面左右方向發生張力，因此於該部分容易發生裂開。As shown in Fig. 11, when the second press-molded article 9 is produced using the mold 6 of the second comparative example, the punch high top portion 316 is in contact with the blank 7 before the punch lower top portion 317, and the top plate high portion 911 is lower than the top plate lower portion 912. Formed first. Then, as the hot press forming progresses, the point 7 of the punch lower top 317 is in contact with the blank 7, and the blank 7 is limited by the formed punch high top 316. Therefore, in the portion of the vertical wall portion 93 that is close to the top step portion 913, the material inflow is insufficient, and tension occurs in the left and right direction of the paper surface, so that cracking easily occurs in the portion.

於本發明的實施形態，藉由使用具有內墊33的第2模具3，於縱壁部93的部分(尤其是接近頂板階差部913的部分)，擴大防止或抑制溫度降低的部分的範圍。藉此，可緩和變形集中於局部，防止或抑制發生裂開。進而言之，如圖8A所示，一面藉由內墊33，支撐胚料7之中成為頂板部91的部分及成為頂板階差部913的部分及其附近，一面進行熱壓成型。藉此，胚料7之中位於衝頭高頂部316上側的部分、與位於頂板低頂部317上側的部分，大致同時成型為頂板高部911及頂板低部912。因此，熱壓成型時，可減少在非接觸部73產生的紙面左右方向的張力。In the embodiment of the present invention, by using the second mold 3 having the inner pad 33, the portion of the vertical wall portion 93 (particularly the portion close to the top step portion 913) is expanded to prevent or suppress the temperature drop. . Thereby, the deformation can be moderated to the local area, and cracking can be prevented or suppressed. Further, as shown in FIG. 8A, the inner pad 33 supports the portion of the blank 7 which becomes the top plate portion 91 and the portion which becomes the top step portion 913 and the vicinity thereof, and is subjected to hot press forming. Thereby, the portion of the blank 7 on the upper side of the punch top 316 and the portion on the upper side of the lower top 317 of the top plate are formed substantially simultaneously into the top plate upper portion 911 and the top plate lower portion 912. Therefore, at the time of hot press forming, the tension in the left-right direction of the paper surface generated in the non-contact portion 73 can be reduced.

然後，藉由內墊33減少在胚料7產生的前述張力的作用，以及擴大胚料7的非接觸部73的範圍的作用，成型性大幅提升。如此，製造設有頂板高部911及頂板低部912的第2壓製成型品9時，藉由使用具有內墊33的第2模具3，可於縱壁部93之中接近頂板階差部913的部分(連續於頂板低部912的縱壁部93)，防止或抑制因張力加施在與加壓方向P呈直角的方向而造成發生裂開。Then, by the inner pad 33, the action of the aforementioned tension generated in the blank 7 and the action of expanding the range of the non-contact portion 73 of the blank 7 are greatly enhanced, and the moldability is greatly improved. When the second press-molded article 9 including the top plate height portion 911 and the top plate low portion 912 is manufactured, the second mold 3 having the inner pad 33 can be used to approach the top plate step portion 913 among the vertical wall portions 93. The portion (continuous to the vertical wall portion 93 of the lower portion 912 of the top plate) prevents or suppress the occurrence of cracking due to the application of the tension in a direction perpendicular to the pressing direction P.

圖12A及圖12B是表示製造第2壓製成型品9時依據板厚減少率的數值分析的等高線圖。圖中以四角形包圍的數值是表示板厚減少率。分別而言，圖12A表示使用第2模具3的情況，圖12B表示使用第2比較例的模具6的情況。圖12C及圖12D是表示製造第2壓製成型品9時，衝模32位於下死點上方4mm的狀態下，溫度為650℃以上的區域的圖。分別而言，圖12C表示使用第2模具3的情況，圖12D表示使用第2比較例的模具6的情況。再者，塗黑底的區域表示溫度為650℃以下的區域。12A and 12B are contour maps showing numerical analysis of the thickness reduction rate when the second press-molded product 9 is produced. The numerical value surrounded by a square in the figure indicates the plate thickness reduction rate. In each case, FIG. 12A shows a case where the second mold 3 is used, and FIG. 12B shows a case where the mold 6 of the second comparative example is used. 12C and FIG. 12D are views showing a region where the temperature of the die 32 is 650 ° C or higher in a state where the die 32 is placed 4 mm above the bottom dead center when the second press-molded article 9 is produced. In each case, FIG. 12C shows a case where the second mold 3 is used, and FIG. 12D shows a case where the mold 6 of the second comparative example is used. Further, the black-coated region indicates a region having a temperature of 650 ° C or lower.

對比圖12A與圖12B、以及圖12C與圖12D可得知，若使用第2模具3，相較於使用第2比較例的模具6，可擴大胚料7的非接觸部73的範圍，藉此可緩和變形集中於局部，抑制板厚減少率上升。因此，可防止或抑制縱壁部93之中接近頂板階差部913的部分發生裂開。12A and FIG. 12B, and FIG. 12C and FIG. 12D, it can be seen that when the second mold 3 is used, the range of the non-contact portion 73 of the blank 7 can be expanded compared to the mold 6 of the second comparative example. This can alleviate the deformation and concentrate on the local part, and suppress the increase in the thickness reduction rate. Therefore, it is possible to prevent or suppress the cracking of the portion of the vertical wall portion 93 that is close to the top step portion 913.

＜實施例＞接著，說明實施例。於本發明的實施例，將拉伸強度目標設為1500MPa，製造壓製成型品，針對如下(1)、(2)測定。(1)在胚料7設置於模具2、3的時序，內墊頂部231、331的表面溫度T，製造的壓製成型品8、9接觸內墊頂部231、331的部分的機械強度。(2)待機時間A(從模具2、3取出壓製成型品8、9到設置下一胚料7的時間)與內墊頂部231、331的表面溫度T的關係。<Embodiment> Next, an embodiment will be described. In the examples of the present invention, the tensile strength was set to 1500 MPa, and a press-molded article was produced, which was measured for the following (1) and (2). (1) The mechanical strength of the portion where the press-formed products 8, 9 are brought into contact with the inner top portions 231, 331 of the inner molded top portions 231, 331 at the timing when the blank 7 is placed on the molds 2, 3. (2) The relationship between the standby time A (the time from which the press-molded articles 8, 9 are taken out from the molds 2, 3 to the time when the next blank 7 is set) and the surface temperature T of the inner pad tops 231, 331.

測定條件如下。胚料7與內墊23、33的接觸面積為5000mm ²。內墊23、33的加壓方向尺寸h為100mm。內墊23、33為工具鋼，熱傳導率l為30W/mK，比熱C為4.3J/g×K。內墊23、33的內部的冷媒路徑233、333的體積比率W為0.02。從內墊23、33的表面到冷媒路徑233、333的深度為20mm。胚料7使用以質量百分比表示的碳量為0.11%，厚度t為2.3mm的碳鋼板材。胚料7設置於模具2、3的時點，胚料7的溫度為750℃。冷媒使用水。冷媒路徑中233、333中的冷媒流速為1m/s。 The measurement conditions are as follows. The contact area of the blank 7 with the inner pads 23, 33 was 5000 mm ² . The pressing direction dimension h of the inner pads 23, 33 is 100 mm. The inner pads 23, 33 are tool steels having a thermal conductivity l of 30 W/mK and a specific heat C of 4.3 J/g x K. The volume ratio W of the refrigerant paths 233, 333 inside the inner pads 23, 33 is 0.02. The depth from the surface of the inner pads 23, 33 to the refrigerant paths 233, 333 is 20 mm. The billet 7 used a carbon steel sheet having a mass percentage of 0.11% and a thickness t of 2.3 mm. When the blank 7 was placed on the molds 2, 3, the temperature of the blank 7 was 750 °C. The refrigerant uses water. The refrigerant flow rate in 233, 333 in the refrigerant path is 1 m/s.

圖13是表示將胚料7設置於模具2、3的時序的內墊頂部231、331的表面溫度T、與製造的壓製成型品8、9其接觸內墊頂部231、331的部分的機械強度的關係圖。再者，內墊頂部231、331的表面溫度T是利用前述數式(2)所計算的值。如圖13所示，確認於胚料7設置於模具2、3的時序，若內墊頂部231、331的表面溫度T為100℃以下，則熱壓成型時接觸內墊頂部231、331的部分的拉伸強度為1500MPa以上。尤其在100℃附近，拉伸強度急遽變高，因此確認宜將內墊頂部231、331的表面溫度T的上限設為100℃且滿足前述數式(2)。Fig. 13 is a view showing the surface temperature T of the inner pad tops 231, 331 at the timing at which the blank 7 is placed on the dies 2, 3, and the mechanical strength of the portions of the manufactured press-molded articles 8, 9 which are in contact with the inner pad tops 231, 331 Diagram of the relationship. Further, the surface temperature T of the inner pad tops 231, 331 is a value calculated by the above formula (2). As shown in Fig. 13, it is confirmed that the timing at which the blank 7 is placed on the molds 2, 3 is such that if the surface temperature T of the inner pad tops 231, 331 is 100 ° C or less, the portions of the inner pad top portions 231, 331 which are in contact with the inner pad during hot press molding are formed. The tensile strength is 1500 MPa or more. In particular, in the vicinity of 100 ° C, the tensile strength is rapidly increased. Therefore, it is confirmed that the upper limit of the surface temperature T of the inner pad tops 231 and 331 is set to 100 ° C and the above formula (2) is satisfied.

圖14是表示待機時間A(從模具2、3取出壓製成型品8、9到設置下一個胚料7的時間)與內墊頂部231、331的表面溫度T的關係圖。再者，該待機時間A是利用前述數式(3)計算的值。如圖14所示，隨著待機時間A變長，內墊頂部231、331的表面溫度T變低。然後，在待機時間A超過5秒的範圍，內墊頂部231、331的表面溫度T幾乎不降低。如此，確認待機時間A宜設為以5秒為下限且滿足前述數式(3)。Fig. 14 is a graph showing the relationship between the standby time A (the time from which the press-molded articles 8, 9 are taken out from the molds 2, 3 to the time when the next blank 7 is set) and the surface temperature T of the inner pad tops 231, 331. Furthermore, the standby time A is a value calculated by the above equation (3). As shown in FIG. 14, as the standby time A becomes longer, the surface temperature T of the inner pad tops 231, 331 becomes lower. Then, in the range where the standby time A exceeds 5 seconds, the surface temperature T of the inner pad tops 231, 331 hardly decreases. In this way, it is preferable to confirm that the standby time A is set to the lower limit of 5 seconds and the above equation (3) is satisfied.

圖15是表示內墊23、33的加壓方向尺寸h與內墊頂部231、331的表面溫度T的關係圖。再者，測定條件與上述條件相同。又，該加壓方向尺寸h的值是利用前述數式(1)計算的值。隨著內墊23、33的加壓方向尺寸h變大，內墊頂部231、331的表面溫度T變低。然後，在內墊23、33的加壓方向尺寸h為100mm以上的範圍時，即使加壓方向尺寸h變大，內墊頂部231、331的表面溫度T幾乎不降低。如此，確認內墊23、33的加壓方向尺寸h宜設為以100mm為下限且滿足前述數式(1)。Fig. 15 is a view showing the relationship between the pressing direction dimension h of the inner pads 23, 33 and the surface temperature T of the inner pad tops 231, 331. Furthermore, the measurement conditions are the same as those described above. Moreover, the value of the pressurization direction dimension h is a value calculated by the above formula (1). As the pressing direction dimension h of the inner pads 23, 33 becomes larger, the surface temperature T of the inner pad tops 231, 331 becomes lower. When the pressing direction dimension h of the inner pads 23 and 33 is in the range of 100 mm or more, the surface temperature T of the inner pad tops 231 and 331 hardly decreases even if the pressing direction dimension h becomes large. In this way, it is confirmed that the dimension h of the pressing direction of the inner pads 23 and 33 is set to a lower limit of 100 mm and satisfies the above formula (1).

以上參考圖式，詳細說明了本發明的實施形態。然而，上述實施形態只是用以實施本發明的例示。本發明不受上述實施形態限定，可於不脫離其旨趣的範圍內，適宜變更上述實施形態來實施。Embodiments of the present invention have been described in detail above with reference to the drawings. However, the above embodiments are merely illustrative of the implementation of the present invention. The present invention is not limited to the above-described embodiments, and the above embodiments can be modified as appropriate without departing from the scope of the invention.

產業上之可利用性本發明可利用在與熱壓法、以及執行熱壓法的熱壓系統相關的產業。Industrial Applicability The present invention can be utilized in an industry related to a hot press method and a hot press system that performs a hot press method.

1…熱壓系統 2…第1模具 3…第2模具 5、6…模具 7…胚料 8…第1壓製成型品 9…第2壓製成型品 11…壓機 12…加壓控制部 13…內墊冷卻機構 14…冷卻控制部 15…工件搬送機構 16…工件搬送控制部 21、31、51…衝頭 22、32、52…衝模 23、33…內墊 24、34…賦予勢能機構 71…衝模肩接觸部 72…內墊肩接觸部 73…非接觸部 74…衝頭肩接觸部 81、91…頂板部 82、92…稜線部 83、93…縱壁部 84…曲部 131…冷媒供給源 132…冷媒噴射噴嘴 211、311…衝頭突部 212、312…衝頭頂部 213、313…衝頭肩R角部 214、314…衝頭縱壁部 215、315…內墊收容孔 216…衝頭曲部 221、321…衝模凹部 222、322…衝模肩R角部 223、323…冷媒噴射孔 231…內墊頂部 232…內墊肩R角部 233、333…冷媒路徑 316…衝頭高頂部 317…衝頭低頂部 911…頂板高部 912…頂板低部 913…頂板階差部 A…待機時間 h…內墊的加壓方向尺寸 P…加壓方向 S…冷媒路徑中的冷媒流速 T…內墊的表面溫度 t…胚料的厚度 W…內墊內部的冷媒路徑的體積比率 l…內墊的熱傳導率1...Hot press system 2...first mold 3...second mold 5,6...mold 7...binder 8...first press molded product 9...second press molded product 11...press machine 12...pressurization control unit 13... Inner pad cooling mechanism 14 ... cooling control unit 15 ... workpiece transfer mechanism 16 ... workpiece transfer control unit 21 , 31 , 51 ... punches 22 , 32 , 52 ... dies 23 , 33 ... inner pads 24 , 34 ... are provided with potential energy mechanisms 71 ... Die shoulder contact portion 72... inner pad contact portion 73... non-contact portion 74... punch shoulder contact portion 81, 91... top plate portion 82, 92... ridge portion 83, 93... vertical wall portion 84... curved portion 131... refrigerant supply source 132...refrigerant injection nozzles 211, 311... punch projections 212, 312... punch tops 213, 313... punch shoulders R corners 214, 314... punch vertical wall portions 215, 315... inner cushion receiving holes 216... Head curved portions 221, 321 ... die recesses 222, 322 ... die shoulder R corner portions 223, 323 ... refrigerant injection holes 231 ... inner pad top 232 ... inner pad shoulder R corner portions 233, 333 ... refrigerant path 316 ... punch high top 317 ...punch low top 911... top plate high portion 912... top plate lower portion 913... top plate step portion A... standby time h... pressurization direction of inner pad Inch pad P S ... ... pad pressing direction of the refrigerant in the refrigerant flow path inside surface temperature T t ... pad refrigerant path inside the billet thickness W is ... ... ... L the volume ratio of the thermal conductivity

圖1是模式性表示第1壓製成型品的構成例的圖。圖2是模式性表示第2壓製成型品的構成例的圖。圖3A是模式性表示製造第1壓製成型品所用的第1模具的構成例的剖面圖。圖3B是模式性表示製造第1壓製成型品所用的第1模具的衝頭構成例的立體圖。圖4是模式性表示製造第2壓製成型品所用的第2模具的構成例的剖面圖。圖5是模式性表示熱壓系統的構成例的圖。圖6是模式性表示內墊冷卻機構的其他構成例的圖。圖7A是模式性表示使用第1模具的熱壓法在預定時序的狀態的剖面圖。圖7B是模式性表示使用第1模具的熱壓法在預定時序的狀態的剖面圖。圖7C是模式性表示使用第1模具的熱壓法在預定時序的狀態的剖面圖。圖7D是模式性表示使用第1模具的熱壓法在預定時序的狀態的剖面圖。圖7E是模式性表示使用第1模具的熱壓法在預定時序的狀態的剖面圖。圖8A是模式性表示使用第2模具的熱壓法在預定時序的狀態的剖面圖。圖8B是模式性表示使用第2模具的熱壓法在預定時序的狀態的剖面圖。圖8C是模式性表示使用第2模具的熱壓法在預定時序的狀態的剖面圖。圖8D是模式性表示使用第2模具的熱壓法在預定時序的狀態的剖面圖。圖8E是模式性表示使用第2模具的熱壓法在預定時序的狀態的剖面圖。圖9是模式性表示第1比較例的模具構成例的剖面圖。圖10A是表示使用第1模具製造第1壓製成型品時依據板厚減少率的數值分析的等高線圖。圖10B是表示使用第1比較例的模具製造第1壓製成型品時依據板厚減少率的數值分析的等高線圖。圖10C是表示使用第1模具製造第1壓製成型品時依據各部溫度的數值分析的等高線圖。圖10D是表示使用第1比較例的模具製造第1壓製成型品時依據各部溫度的數值分析的等高線圖。圖11是模式性表示第2比較例的模具構成例的圖。圖12A是表示使用第2模具製造第2壓製成型品時依據板厚減少率的數值分析的等高線圖。圖12B是表示使用第2比較例的模具製造第2壓製成型品時依據板厚減少率的數值分析的等高線圖。圖12C是表示使用第2模具製造第2壓製成型品時依據各部溫度的數值分析的等高線圖。圖12D是表示使用第2比較例的模具製造第2壓製成型品時依據各部溫度的數值分析的等高線圖。圖13是表示將胚料設置於模具的時序的內墊頂部的表面溫度T、與製造的壓製成型品其接觸內墊頂部的部分的機械強度的關係圖。圖14是表示待機時間A與內墊頂部的表面溫度T的關係圖。圖15是表示內墊的加壓方向尺寸h與內墊頂部的表面溫度T的關係圖。FIG. 1 is a view schematically showing a configuration example of a first press-molded article. FIG. 2 is a view schematically showing a configuration example of a second press-molded article. 3A is a cross-sectional view schematically showing a configuration example of a first mold used for producing a first press-molded article. 3B is a perspective view schematically showing a configuration example of a punch for manufacturing a first mold for use in a first press-molded article. 4 is a cross-sectional view schematically showing a configuration example of a second mold used for manufacturing the second press-molded article. Fig. 5 is a view schematically showing a configuration example of a hot press system. Fig. 6 is a view schematically showing another configuration example of the inner pad cooling mechanism. Fig. 7A is a cross-sectional view schematically showing a state in which a hot press method using a first mold is at a predetermined timing. Fig. 7B is a cross-sectional view schematically showing a state in which a hot press method using a first mold is at a predetermined timing. Fig. 7C is a cross-sectional view schematically showing a state in which a hot press method using a first mold is at a predetermined timing. Fig. 7D is a cross-sectional view schematically showing a state in which a hot press method using a first mold is at a predetermined timing. Fig. 7E is a cross-sectional view schematically showing a state in which a hot press method using a first mold is at a predetermined timing. Fig. 8A is a cross-sectional view schematically showing a state in which a hot press method using a second mold is at a predetermined timing. Fig. 8B is a cross-sectional view schematically showing a state in which a hot press method using a second mold is at a predetermined timing. 8C is a cross-sectional view schematically showing a state in which a hot press method using a second mold is at a predetermined timing. 8D is a cross-sectional view schematically showing a state in which a hot press method using a second mold is at a predetermined timing. 8E is a cross-sectional view schematically showing a state in which a hot press method using a second mold is at a predetermined timing. FIG. 9 is a cross-sectional view schematically showing a configuration example of a mold of a first comparative example. FIG. 10A is a contour diagram showing numerical analysis of a plate thickness reduction rate when a first press-molded article is produced using a first mold. FIG. 10B is a contour diagram showing numerical analysis of the thickness reduction rate when the first press-molded article is produced using the mold of the first comparative example. FIG. 10C is a contour diagram showing numerical analysis of each part temperature when the first press-molded article is produced using the first mold. FIG. 10D is a contour diagram showing numerical analysis of each part temperature when the first press-molded article is produced using the mold of the first comparative example. FIG. 11 is a view schematically showing an example of a mold configuration of a second comparative example. Fig. 12A is a contour diagram showing numerical analysis of a plate thickness reduction rate when a second press-molded article is produced using a second mold. FIG. 12B is a contour diagram showing numerical analysis of the thickness reduction rate when the second press-molded article is produced using the mold of the second comparative example. Fig. 12C is a contour diagram showing numerical analysis of the temperature of each part when the second press-molded article is produced using the second mold. 12D is a contour diagram showing numerical analysis of the temperature of each part when the second press-molded article is produced using the mold of the second comparative example. Fig. 13 is a view showing the relationship between the surface temperature T of the top of the inner pad at the time when the blank is placed on the mold, and the mechanical strength of the portion of the press-formed product which is in contact with the top of the inner pad. Fig. 14 is a graph showing the relationship between the standby time A and the surface temperature T of the top of the inner pad. Fig. 15 is a view showing the relationship between the pressing direction dimension h of the inner pad and the surface temperature T of the inner pad top.

Claims

一種熱壓法，使用具有上模、下模及內墊的模具，將胚料予以熱壓來製造壓製成型品，其中該內墊是可移動地收容於前述下模，被賦予勢能成為朝向前述上模突出的狀態；其特徵在於：於前述內墊的內部，設置冷媒的路徑；藉由讓冷媒流動在前述冷媒的路徑，以使前述內墊的表面溫度，在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，冷卻至以100℃為上限且滿足如下數式的溫度；T100×(2.3/t)×(h/100)×(λ/30)×(W/2)×S在此，T：內墊的表面溫度(℃)h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 A hot pressing method for producing a press-formed product by hot pressing a blank having a mold having an upper mold, a lower mold, and an inner mat, wherein the inner cushion is movably received in the lower mold, and the potential energy is imparted toward the foregoing a state in which the upper mold is protruded; characterized in that: a path of the refrigerant is provided inside the inner pad; and the surface temperature of the inner pad is caused by the flow of the refrigerant in the refrigerant, and the press-molded product is taken out from the mold Until the next blank is placed between the aforementioned molds, and cooled to a temperature of 100 ° C and satisfying the following formula; 100 × (2.3 / t) × (h / 100) × (λ / 30) × (W / 2) × S Here, T: surface temperature of the inner pad (°C) h: size of the inner pad's pressing direction ( Mm)t: thickness of the blank (mm) λ: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path ( Mm/sec).

如請求項1之熱壓法，其中將從前述模具取出壓製成型品到將下一個胚料設置於前述模具的時間，設為以5秒為下限且滿足如下數式的時間；A5×(t/2.3)×(100/h)×(30/λ)×(2/W)×(1/S)在此， A：從模具取出壓製成型品到將下一個胚料設置於模具的時間(sec)h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 The hot pressing method of claim 1, wherein the time from which the press-formed product is taken out from the mold to the time when the next blank is placed on the mold is set to a time limit of 5 seconds and a time of the following formula is satisfied; 5 × (t / 2.3) × (100 / h) × (30 / λ) × (2 / W) × (1/S) Here, A: take out the press-molded product from the mold to set the next blank to Time of the mold (sec)h: dimension of the pressing direction of the inner pad (mm) t: thickness of the blank (mm) λ: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ )S: The flow rate of the refrigerant in the refrigerant path (mm/sec).

如請求項1之熱壓法，其中前述內墊的加壓方向尺寸是以100mm為下限且滿足如下數式；h100×(t/2.3)×(30/λ)×(2/W)×(1/S)在此，h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 The hot pressing method of claim 1, wherein the pressing direction dimension of the inner pad is a lower limit of 100 mm and satisfies the following formula; 100 × (t / 2.3) × (30 / λ) × (2 / W) × (1/S) Here, h: the direction of the pressing direction of the inner pad (mm) t: the thickness of the blank (mm) λ : Thermal conductivity (W/mK) of the inner pad W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path (mm/sec).

如請求項1之熱壓法，其中在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，對前述內墊噴射流體的冷媒來冷卻前述內墊。 The hot pressing method of claim 1, wherein the fluid is sprayed on the inner pad to cool the inner pad, after the press-molded article is taken out from the mold to the next one of the molds.

如請求項1之熱壓法，其中於前述上模設置冷媒噴射孔，該冷媒噴射孔可朝向前述內墊噴射冷媒；在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，使前述上模接近前述下模，從前述冷媒噴射孔，朝向設置於前述下模的前述內墊噴射冷媒，藉此冷卻前述內墊。 The hot pressing method of claim 1, wherein a refrigerant injection hole is provided in the upper mold, the refrigerant injection hole may spray the refrigerant toward the inner liner; and the press molded product is taken out from the mold to set the next blank to the mold The upper mold is brought close to the lower mold, and the refrigerant is ejected from the refrigerant injection hole toward the inner pad provided in the lower mold. Cool the aforementioned inner pad.

一種熱壓系統，其特徵為具有：壓機，使用具有上模、下模及內墊的模具，將胚料予以熱壓，其中該內墊可移動地收容於前述下模，被賦予勢能成為朝向前述上模突出的狀態，且於內部設有冷媒的路徑；及冷卻控制部，控制冷卻前述內墊的冷媒的供給，前述冷卻控制部是藉由讓冷媒流動在前述冷媒的路徑，以使前述內墊的表面溫度，在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，冷卻至以100℃為上限且滿足如下數式的溫度；T100×(2.3/t)×(h/100)×(λ/30)×(W/2)×S在此，T：內墊的表面溫度(℃)h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 A hot pressing system, comprising: a press machine, wherein a billet is heat-pressed using a mold having an upper mold, a lower mold and an inner mat, wherein the inner mat is movably received in the lower mold, and the potential energy is imparted a direction in which the upper mold protrudes, and a path in which a refrigerant is provided inside; and a cooling control unit that controls supply of the refrigerant that cools the inner pad, wherein the cooling control unit causes a flow of the refrigerant to flow through the refrigerant so that The surface temperature of the inner mat is set between the press mold and the next billet between the molds, and is cooled to a temperature of 100 ° C and satisfying the following formula; 100 × (2.3 / t) × (h / 100) × (λ / 30) × (W / 2) × S Here, T: surface temperature of the inner pad (°C) h: size of the inner pad's pressing direction ( Mm)t: thickness of the blank (mm) λ: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path ( Mm/sec).

如請求項6之熱壓系統，其中將從前述模具取出壓製成型品到將下一個胚料設置於前述模具的時間，設為以5秒為下限且滿足如下數式的時間；A5×(t/2.3)×(100/h)×(30/λ)×(2/W)×(1/S)在此， A：從模具取出壓製成型品到將下一個胚料設置於模具的時間(sec)h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 The hot pressing system of claim 6, wherein the time from which the press-formed product is taken out from the mold to the time when the next blank is placed on the mold is set to a time limit of 5 seconds and a time of the following formula is satisfied; 5 × (t / 2.3) × (100 / h) × (30 / λ) × (2 / W) × (1/S) Here, A: take out the press-molded product from the mold to set the next blank to Time of the mold (sec)h: dimension of the pressing direction of the inner pad (mm) t: thickness of the blank (mm) λ: thermal conductivity of the inner pad (W/mK) W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ )S: The flow rate of the refrigerant in the refrigerant path (mm/sec).

如請求項6之熱壓系統，其中前述內墊的加壓方向尺寸是以100mm為下限且滿足如下數式；h100×(t/2.3)×(30/λ)×(2/W)×(1/S)在此，h：內墊的加壓方向尺寸(mm)t：胚料的厚度(mm)λ：內墊的熱傳導率(W/mK)W：內墊內部的冷媒路徑的體積比率(mm³/mm³)S：冷媒路徑中的冷媒流速(mm/sec)。 The hot pressing system of claim 6, wherein the pressing direction dimension of the inner pad is a lower limit of 100 mm and satisfies the following formula; 100 × (t / 2.3) × (30 / λ) × (2 / W) × (1/S) Here, h: the direction of the pressing direction of the inner pad (mm) t: the thickness of the blank (mm) λ : Thermal conductivity (W/mK) of the inner pad W: volume ratio of the refrigerant path inside the inner pad (mm ³ /mm ³ ) S: flow rate of the refrigerant in the refrigerant path (mm/sec).

如請求項6之熱壓系統，其中進一步具有冷媒噴射部，該冷媒噴射部對前述內墊噴射冷媒；前述冷媒噴射部是在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，對前述內墊噴射流體的冷媒來冷卻前述內墊。 A hot press system according to claim 6, further comprising a refrigerant ejecting portion that ejects the refrigerant to the inner pad; the refrigerant ejecting portion is configured to take the press molded product from the mold to set the next billet to the mold The refrigerant is sprayed on the inner pad to cool the inner pad.

如請求項6之熱壓系統，其中於前述上模設置冷媒噴射孔，該冷媒噴射孔可朝向前述內墊噴射冷媒；在從前述模具取出壓製成型品到將下一個胚料設置於前述模具之間，前述壓機使前述上模接近前述下模，前述冷卻控制部使冷媒從前述冷媒噴射孔，朝向設置於前述下模的前述內墊噴射，藉此冷卻前述內墊。 The hot pressing system of claim 6, wherein a refrigerant injection hole is provided in the upper mold, the refrigerant injection hole may spray the refrigerant toward the inner liner; and the press molded product is taken out from the mold to set the next blank Between the dies, the press brings the upper mold closer to the lower mold, and the cooling control unit ejects the refrigerant from the refrigerant injection hole toward the inner pad provided in the lower mold, thereby cooling the inner mat.