WO2019114296A1 - 一种梯度硬质合金钻尾模 - Google Patents

一种梯度硬质合金钻尾模 Download PDF

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Publication number
WO2019114296A1
WO2019114296A1 PCT/CN2018/099316 CN2018099316W WO2019114296A1 WO 2019114296 A1 WO2019114296 A1 WO 2019114296A1 CN 2018099316 W CN2018099316 W CN 2018099316W WO 2019114296 A1 WO2019114296 A1 WO 2019114296A1
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Prior art keywords
base
cemented carbide
powder
mold
tailing
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PCT/CN2018/099316
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English (en)
French (fr)
Inventor
李京达
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鑫京瑞钨钢(厦门)有限公司
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Publication of WO2019114296A1 publication Critical patent/WO2019114296A1/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/007Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/12Metallic powder containing non-metallic particles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/004Filling molds with powder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/1017Multiple heating or additional steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention relates to the technical field of cemented carbides, in particular to a gradient cemented carbide tailing die.
  • Cemented carbide is a material with high hardness, high strength and high wear resistance, and has been widely used in many fields of modern industry.
  • the cemented carbide product is usually a powder metallurgy product which is sintered in a vacuum furnace or a hydrogen sintering furnace with a carbide micron-sized powder of a high hardness refractory metal as a main component.
  • Carbide products are widely used in oil drilling, coal cutter teeth, road cold milling machine teeth, stamping dies, rolls and other fields.
  • Chinese patent CN103817150 discloses a gradient structure type cemented carbide roll ring comprising a roll ring outer layer and a roll ring core portion, the roll ring outer layer is disposed on the outer surface of the roll ring core portion, and the roll ring outer layer is the same as the roll ring core portion. There is an inter-melting layer between them, forming a composition gradient between the outer layer of the roll ring and the core of the roll ring, the outer layer of the roll ring and the core of the roll ring are different, and the outer layer of the roll ring after the wax is dried is ball milled and mixed.
  • the core of the roller ring is ball-milled and mixed, and the powder is rolled into a roll ring blank, and the final product is obtained by sintering.
  • the disadvantage is that the composite cemented carbide product is obtained by using the composition gradient, and the component diffusion due to the concentration gradient occurs during the sintering process, and the fine process difference causes the diffusion condition to be very different, which makes the final product performance consistency difficult to control.
  • Chinese patent CN201611158327.7 is a solution to the above problem, but after a period of use, it is found that the tail mold is in use, because the upper and lower layers are different in material and compacted, resulting in stress concentration during use.
  • the joint surface is affected by the pure shear stress, and the joint surface is prone to cracking on both sides of the joint surface, resulting in a decrease in the service life of the mold.
  • the applicant has invented a new gradient cemented carbide tail mold after extensive research. Prepare the structure.
  • the present invention is directed to the improvement of the above problems in the prior art, that is, the technical problem to be solved by the present invention is to provide a gradient hard alloy drill tail die with uniform force and long service life.
  • a gradient cemented carbide tail die comprising a base made of cemented carbide, the base is provided with a mold blank, and the base is further provided with a mold a discharge chute, the unloading trough comprises a vertical trough and a transverse trough connecting the middle of the vertical trough, the two ends of the vertical trough are respectively connected with the opposite front and rear side walls of the base, and one end of the horizontal trough is connected with the right side wall of the base
  • the mold blank sinks from the top surface of the base into the interior of the base, the left side of the mold blank is flush with the left side wall of the base, and the right side of the mold blank is not connected to the discharge chute.
  • the hardness of the mold base is higher than the hardness of the base, and the mold base and the base are combined by high temperature sintering.
  • the top surface of the mold blank is flush with the top surface of the base.
  • the right side of the mold blank is separated from the discharge tank by 1 to 5 mm.
  • the top surface of the mold blank is not flush with the top surface of the base.
  • the cemented carbide of the mold base is composed of WC powder, Co powder and VC powder, wherein the WC powder has a particle size d top of 0.6-6 ⁇ m.
  • the discharge chute is a transverse groove.
  • the intersection line of the mold blank and the left side surface of the base is polygonal, or consists of a plurality of arcs, or is composed of a plurality of curved lines, or consists of straight lines and curved lines, or consists of straight lines and curved lines, or It consists of arcs and curves, or lines, curves, and arcs.
  • the intersection contour of the mold base and the top surface of the base is polygonal, or consists of a plurality of arcs, or consists of a plurality of curved lines, or consists of straight lines and arcs, or consists of straight lines and curves, or is composed of arcs.
  • the longitudinal section profile of the mold blank is always equal from left to right.
  • the longitudinal section profile of the mold blank is not always equal from left to right.
  • the present invention Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a hard alloy blank with a higher hardness on a lower hardness base, and the stress condition is no longer subjected to shear stress on a horizontal surface. The service life of the mold has increased significantly.
  • FIG. 1 is a schematic view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the gradient cemented carbide tailing die of FIG. 1 taken along line A-A of FIG. 1 according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the gradient cemented carbide tailing die of FIG. 1 taken along line B-B of FIG. 1 according to an embodiment of the present invention.
  • FIG. 4 is a left side view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • Figure 5 is a cross-sectional view of the gradient cemented carbide tailing die of Figure 1 taken along line B-B of Figure 1 of the present invention.
  • FIG. 6 is a left side view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • Fig. 7 is a left side view showing a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • FIG 8 is a left side view of a six-graded cemented carbide drill tail die according to an embodiment of the present invention.
  • FIG. 9 is a left side view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • FIG. 10 is a left side view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • Figure 11 is a left side view of a gradient cemented carbide tailing die according to an embodiment of the present invention.
  • FIG. 12 is a left side view of a ten gradient cemented carbide tailing die according to an embodiment of the present invention.
  • Figure 13 is a left side view of a gradient cemented carbide tailing die according to an eleventh embodiment of the present invention.
  • Figure 14 is a left side view of a twelve gradient cemented carbide tailing die according to an embodiment of the present invention.
  • Figure 15 is a schematic view of a gradient cemented carbide tailing die according to a thirteenth embodiment of the present invention.
  • Figure 16 is a schematic view of a four-step gradient cemented carbide tailing die according to an embodiment of the present invention.
  • a gradient cemented carbide tail die comprises a base 1 made of cemented carbide, and a base 2 is disposed on the base, and the base 1 is arranged on the base 1
  • the discharge chute 3 is further provided with a vertical groove 31 and a horizontal groove 32 connecting the middle of the vertical groove 31.
  • the two ends of the vertical groove 31 communicate with the opposite side walls of the base 1 and the front, respectively.
  • One end of the lateral groove 32 communicates with the right side wall of the base 1.
  • the mold blank 2 sinks from the top surface of the base 1 into the interior of the base 1.
  • the left side of the mold base 2 is flush with the left side wall of the base 1.
  • the right side of the mold blank 2 is not in communication with the vertical groove 31 of the discharge chute 3, the hardness of the mold blank 2 is higher than the hardness of the base 1, and the mold base 2 and the base 1 are bonded by high-temperature sintering.
  • the top surface of the mold blank 2 is flush with the top surface of the base 1.
  • the right side of the mold blank 2 is spaced 5 mm from the vertical groove 31 of the discharge chute 3.
  • the cemented carbide of the mold blank 2 is composed of WC powder, Co powder and VC powder, wherein the WC powder has a particle size d top of 0.6 ⁇ m.
  • intersection contour of the mold blank 2 and the left side surface of the base 1 is semicircular.
  • the blanks 2 are always equal from left to right along the B-B longitudinal section profile in FIG.
  • the gradient cemented carbide tail mold is produced by the following steps:
  • base 1 Weigh WC powder, Co powder and Cr 3 C 2 powder (or powder with VC) for raw ingredients, a bottom diameter d WC powder is 6-16 ⁇ m, even after mixing The raw material is subjected to wet ball milling, and after the wet ball milling, the wet ball milled mixture is subjected to the first wet sieving, the first sifted mixture is vacuum dried, and the vacuum dried mixture is subjected to the first After sieving twice, then drying into a wax to obtain a cemented carbide mixture of the base;
  • WC powder, Co powder and Cr 3 C 2 powder are respectively weighed into raw materials, and the WC powder has a particle size d top of 0.6-6 ⁇ m, which will be uniformly mixed.
  • the raw material is subjected to wet ball milling, and after the wet ball milling, the wet ball milled mixture is subjected to the first wet sieving, the first sifted mixture is vacuum dried, and the vacuum dried mixture is subjected to the first After sieving twice, then drying into a wax to obtain a cemented carbide mixture of the mold blank;
  • Molding and pressing firstly put the appropriate amount of the cemented carbide mixture into the molding die, apply pressure pressing of 140MPa, and press the semicircular groove and the discharge chute 3 in the upper part of the base (the relevant parameters are set according to the setting). The value is selected), and then the cemented carbide mixture of the appropriate mold blank 2 is placed in the mold and placed in the groove, and the mixture in the forming mold is compacted by applying a pressure of 100-140 MPa to obtain a gradient cemented carbide tail-molded blank;
  • the circular arc-shaped contact surface of the mold blank 2 distributes the stress on the interface of the mold base 2 and the base 1 to avoid the shearing. The shear stress and the service life of the mold increased significantly.
  • Embodiment 2 As shown in FIG. 4, the difference from the first embodiment lies in the structure of the mold base 2.
  • the intersection line between the mold blank 2 and the left side of the base 1 is U-shaped, the bottom is semi-circular, and the upper sides are The walls are vertically parallel.
  • the right side of the mold blank 2 and the vertical groove 31 of the discharge chute 3 are separated by 1 mm.
  • the cemented carbide of the mold blank 2 is composed of WC powder, Co powder and VC powder, wherein the WC powder has a particle size d top of 6 ⁇ m.
  • Embodiment 3 As shown in FIG. 1 and FIG. 5, the difference from the second embodiment lies in the structure of the mold blank 2, which is not always equal from left to right along the longitudinal profile of the B-B in FIG.
  • the right side of the mold blank 2 and the vertical groove 31 of the discharge chute 3 are separated by 3 mm.
  • the base 1 is constituted by a cemented carbide WC powder, Co powder and Cr 3 C 2 powder, WC powder, wherein the bottom diameter d is 11 m,
  • the cemented carbide of the mold blank 2 is composed of WC powder, Co powder and VC powder, wherein the WC powder has a particle size d top of 3.5 ⁇ m.
  • Embodiment 4 As shown in FIG. 6, the difference from the second embodiment is that the top surface of the mold blank 2 is not flush with the top surface of the base 1.
  • the right side of the mold blank 2 is spaced 4 mm from the vertical groove 31 of the discharge chute 3.
  • the base 1 is constituted by a cemented carbide WC powder, Co powder and Cr 3 C 2 powder, WC powder, wherein the bottom diameter d is 13 m,
  • the cemented carbide of the mold blank 2 is composed of WC powder, Co powder and VC powder, wherein the WC powder has a particle size d top of 3 ⁇ m.
  • Embodiment 5 As shown in FIG. 7, the difference from Embodiment 1 lies in the structure of the mold base 2, and the intersection line contour of the mold blank 2 and the left side surface of the base 1 is a polygon. The right side of the mold blank 2 is spaced apart from the vertical groove 31 of the discharge chute 3 by 2 mm.
  • Embodiment 6 As shown in FIG. 8, the difference from Embodiment 1 lies in the structure of the mold base 2, and the intersection line contour of the mold blank 2 and the left side surface of the base 1 is a polygon.
  • Embodiment 7 As shown in FIG. 9, the difference from Embodiment 1 lies in the structure of the mold blank 2, and the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of a straight line and an arc.
  • Embodiment 8 As shown in FIG. 10, the difference from Embodiment 1 lies in the structure of the mold blank 2, and the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of a straight line and an arc.
  • Embodiment 9 As shown in FIG. 11, the difference from Embodiment 1 lies in the structure of the mold blank 2, and the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of a straight line and a curved line.
  • Embodiment 10 As shown in FIG. 12, the difference from Embodiment 1 lies in the structure of the mold base 2, and the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of a plurality of arcs.
  • Embodiment 11 As shown in FIG. 13, the difference from Embodiment 1 lies in the structure of the mold blank 2, and the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of an arc and a curve.
  • Embodiment 12 As shown in FIG. 14, the difference from Embodiment 1 lies in the structure of the mold blank 2.
  • the intersection contour of the mold blank 2 and the left side surface of the base 1 is composed of a straight line, an arc and a curve.
  • Embodiment 13 As shown in FIG. 15, the difference from the first embodiment lies in the structure of the mold base 2, and the intersection contour of the top surface of the mold base 2 and the base 1 is composed of a straight line and an arc.
  • Embodiment 14 As shown in FIG. 16, the difference from Embodiment 1 is that the discharge chute 3 is a lateral groove. The rest are the same.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Earth Drilling (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

一种梯度硬质合金钻尾模,包括一用硬质合金制成的底座(1),底座(1)上设置有一模胚(2),底座(1)上还设置有一卸料槽(3),卸料槽(3)包括竖槽(31)和连接竖槽中部的横槽(32),竖槽(31)两端分别与底座(1)前后两相对侧壁相连通,横槽(32)一端与底座(1)右侧壁相连通,模胚(2)的顶面与底座(1)顶面平齐,模胚(2)从底座(1)顶面沉入底座(1)内部,模胚(2)的左侧面与底座(1)左侧壁相平齐,模胚(2)的右侧面与卸料槽(3)之间相距1~5mm,模胚(2)的硬度高于底座(1)的硬度,模胚(2)与底座(1)通过高温烧结实现结合。

Description

一种梯度硬质合金钻尾模 技术领域
本发明涉及硬质合金技术领域,具体涉及一种梯度硬质合金钻尾模。
背景技术
硬质合金是高硬度、高强度、高耐磨的材料,在现代工业的众多领域都得到了广泛应用。硬质合金产品通常是以高硬度难熔金属的碳化物微米级粉末为主要成分,在真空炉或氢气烧结炉中烧结而成的粉末冶金制品。硬质合金产品广泛应用于石油钻齿、截煤机齿、路面冷铣刨机齿、冲压模具、轧辊等领域。
中国专利CN103817150公开了一种梯度结构型硬质合金辊环包括辊环外层和辊环芯部,辊环外层配置在辊环芯部的外表面,在辊环外层同辊环芯部之间有互熔层,在辊环外层和辊环芯部之间形成成分梯度,辊环外层和辊环芯部的成分不同,将掺蜡干燥后的辊环外层球磨混料和掺蜡干燥后的辊环芯部球磨混料分层铺叠装粉,冷压成型为辊环坯料,经烧结获得最终产品。其缺点在于,采用成分梯度获得复合型硬质合金产品,烧结过程中会发生由于浓度梯度导致的成分扩散,细微的工艺差别会导致扩散情况差异很大,造成最终的产品性能一致性难以控制。
中国专利CN201611158327.7,是对上述问题的一种解决方案,但是经过一段时间使用后,发现该钻尾模在使用中,因上下层材质不同并压实在一块,导致在使用时应力集中在结合面,该结合面受纯剪应力的作用,结合面两侧容易发生破裂,导致模具使用寿命减少,针对该情况,申请人经大量研究后发明了一种新的梯度硬质合金钻尾模制备结构。
发明内容
本发明针对上述现有技术存在的问题做出改进,即本发明所要解决的技术问题是提供一种梯度硬质合金钻尾模,受力均匀,使用寿命长。
为了解决上述技术问题,本发明的技术方案是:一种梯度硬质合金钻尾模,包括一用硬质合金制成的底座,所述底座上设置有一模胚,所述底座上还设置有一卸料槽,所述卸料槽包括竖槽和连接竖槽中部的横槽,所述竖槽两端分别与底座前后两相对侧壁相连通,所述横槽一端与底座右侧壁相连通,所述模胚从底座顶面沉入底座内部,所述模胚的左侧面与底座左侧壁相平齐,所述模胚的右侧面与卸料槽之间不连通,所述模胚的硬度高于底座的硬度,所述模胚与底座通过高温烧结实现结合。
进一步优选的,所述模胚的顶面与底座顶面平齐。
进一步优选的,所述模胚的右侧面与卸料槽之间相距1~5mm。
进一步优选的,所述模胚的顶面与底座顶面不平齐。
进一步优选的,所述底座的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为6-16μm。
进一步优选的,所述模胚的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为0.6-6μm。
进一步优选的,所述卸料槽为横槽。
进一步优选的,所述模胚与底座左侧面的交线轮廓呈多边形,或者由多段弧线组成,或者由多段曲线组成,或者由直线和弧线组成,或者由直线和曲线组成,或者由弧线和曲线组成,或者直线、曲线和弧线组成。
进一步优选的,所述模胚与底座顶面的交线轮廓呈多边形,或者由多段弧线组成,或者由多段曲线组成,或者由直线和弧线组成,或者由直线和曲线组成,或者由弧线和曲线组成,或者直线、曲线和弧线组成。进一步优选的,所述模胚的纵剖面轮廓大小从左向右始终相等。
进一步优选的,所述模胚的纵剖面轮廓大小从左向右不是始终相等。
与现有技术相比,本发明具有以下有益效果:本发明通过在硬度较低的底座上设置一个硬度较高的硬质合金模胚,应力状况不再是承受在水平面上的剪切应力,模具使用寿命明显增长。
下面结合附图和具体实施方式对本发明做进一步详细的说明。
附图说明
图1为本发明实施例一梯度硬质合金钻尾模示意图。
图2为本发明实施例一梯度硬质合金钻尾模沿图1中A-A的剖面视图。
图3为本发明实施例一梯度硬质合金钻尾模沿图1中B-B的剖面视图。
图4为本发明实施例二梯度硬质合金钻尾模左视示意图。
图5为本发明实施例三梯度硬质合金钻尾模图1中B-B的剖面视图。
图6为本发明实施例四梯度硬质合金钻尾模左视示意图。
图7为本发明实施例五梯度硬质合金钻尾模左视示意图。
图8为本发明实施例六梯度硬质合金钻尾模左视示意图。
图9为本发明实施例七梯度硬质合金钻尾模左视示意图。
图10为本发明实施例八梯度硬质合金钻尾模左视示意图。
图11为本发明实施例九梯度硬质合金钻尾模左视示意图。
图12为本发明实施例十梯度硬质合金钻尾模左视示意图。
图13为本发明实施例十一梯度硬质合金钻尾模左视示意图。
图14为本发明实施例十二梯度硬质合金钻尾模左视示意图。
图15为本发明实施例十三梯度硬质合金钻尾模示意图。
图16为本发明实施例十四梯度硬质合金钻尾模示意图。
图中:1-底座,2-模胚,3-卸料槽,31-竖槽,32-横槽。
具体实施方式
实施例一:如图1至图3所示,一种梯度硬质合金钻尾模,包括一用硬质合金制成的底座1,所述底座上设置有一模胚2,所述底座1上还设置有一卸料槽3,所述卸料槽3包括竖槽31和连接竖槽31中部的横槽32,所述竖槽31两端分别与底座1前后两相对侧壁相连通,所述横 槽32一端与底座1右侧壁相连通,所述模胚2从底座1顶面沉入底座1内部,所述模胚2的左侧面与底座1左侧壁相平齐,所述模胚2的右侧面与卸料槽3竖槽31之间不连通,所述模胚2的硬度高于底座1的硬度,所述模胚2与底座1通过高温烧结实现结合。
所述模胚2的顶面与底座1顶面平齐。
所述模胚2的右侧面与卸料槽3竖槽31之间相距5mm。
所述底座1的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为6μm。
所述模胚2的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为0.6μm。
所述模胚2与底座1左侧面的交线轮廓呈半圆形。
所述模胚2沿图1中B-B纵剖面轮廓大小从左向右始终相等。
该梯度硬质合金钻尾模,按以下步骤进行制作:
(1)制备底座1的混合料:分别称取WC粉、Co粉和Cr 3C 2粉(或用VC粉)进行原料配料,WC粉粒径d 为6-16μm,将混合均匀后的原料进行湿法球磨,湿法球磨结束后将湿法球磨后的混合料进行第一次湿式过筛,将第一次过筛后的混合料进行真空干燥,将真空干燥后的混合料进行第二次过筛,然后入蜡干燥,获得底座的硬质合金混合料;
(2)制备模胚2混合料:分别称取WC粉、Co粉和Cr 3C 2粉(或用VC粉)进行原料配料,WC粉粒径d 为0.6-6μm,将混合均匀后的原料进行湿法球磨,湿法球磨结束后将湿法球磨后的混合料进行第一次湿式过筛,将第一次过筛后的混合料进行真空干燥,将真空干燥后的混合料进行第二次过筛,然后入蜡干燥,获得模胚的硬质合金混合料;
(3)装模压制:先将适量底座的硬质合金混合料装入成型模具,施加140MPa的压力压制,并在底座上部压制一半圆形凹槽和卸料槽3(其相关参数按设定值选取),再将适量模胚2的硬质合金混合料装入模具置于凹槽,施加压力100-140MPa将成型模具内的混合料压实,获得梯度硬质合金钻尾模压坯;
(4)烧结:将梯度硬质合金钻尾模压坯,以1~3℃/min的速度升温,首先升温至300℃并保温250~300min,然后继续升温至1400-1450℃并保温烧结30-50min,然后以1℃/min降温,获得烧结后的梯度硬质合金钻尾模。
通过在较低硬度的底座1上设置一个半圆形的高硬度的模胚2,模胚2的圆弧形接触面将应力分散在模胚2余底座1相结合的界面上,避免了剪切应力,模具使用寿命明显增长。
实施例二:如图4所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓呈U形,底部为半圆形,上部两侧壁竖直平行。
所述模胚2的右侧面与卸料槽3竖槽31之间相距1mm。
所述底座1的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为16μm。
所述模胚2的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为6μm。
其余相同。
实施例三:如图1和图5所示,与实施例二区别在于其模胚2结构,所述模胚2沿图1中B-B纵剖面轮廓大小从左向右不是始终相等。
所述模胚2的右侧面与卸料槽3竖槽31之间相距3mm。
所述底座1的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为11μm,
所述模胚2的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为3.5μm。
其余相同。
实施例四:如图6所示,与实施例二区别在于其所述模胚2的顶面与底座1顶面不平齐。
所述模胚2的右侧面与卸料槽3竖槽31之间相距4mm。
所述底座1的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为13μm,
所述模胚2的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为3μm。
其余相同。
实施例五:如图7所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓为多边形。所述模胚2的右侧面与卸料槽3竖槽31之间相距2mm。
其余相同。
实施例六:如图8所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓为多边形。
其余相同。
实施例七:如图9所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由直线和弧线组成。
其余相同。
实施例八:如图10所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由直线和弧线组成。
其余相同。
实施例九:如图11所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由直线和曲线组成。
其余相同。
实施例十:如图12所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由多段弧线组成。
其余相同。
实施例十一:如图13所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由弧线和曲线组成。
其余相同。
实施例十二:如图14所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1左侧面的交线轮廓由直线、弧线和曲线组成。
其余相同。
实施例十三:如图15所示,与实施例一区别在于其模胚2结构,所述模胚2与底座1顶面的交线轮廓由直线和弧线组成。
其余相同。
实施例十四:如图16所示,与实施例一区别在于其卸料槽3为横槽。其余相同。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。

Claims (10)

  1. 一种梯度硬质合金钻尾模,包括一用硬质合金制成的底座,所述底座上设置有一模胚,所述底座上还设置有一卸料槽,所述卸料槽包括竖槽和连接竖槽中部的横槽,所述竖槽两端分别与底座前后两相对侧壁相连通,所述横槽一端与底座右侧壁相连通,其特征在于,所述模胚从底座顶面沉入底座内部,所述模胚的左侧面与底座左侧壁相平齐,所述模胚的右侧面与卸料槽之间不连通,所述模胚的硬度高于底座的硬度,所述模胚与底座通过高温烧结实现结合。
  2. 根据权利要求1所述的梯度硬质合金钻尾模,其特征在于,所述模胚的顶面与底座顶面平齐。
  3. 根据权利要求1所述的梯度硬质合金钻尾模,其特征在于,所述模胚的右侧面与卸料槽之间相距1~5mm。
  4. 根据权利要求1所述任一权利要求的梯度硬质合金钻尾模,其特征在于,所述模胚的顶面与底座顶面不平齐。
  5. 根据权利要求1所述的梯度硬质合金钻尾模,其特征在于,所述底座的硬质合金由WC粉、Co粉和Cr 3C 2粉构成,其中WC粉粒径d 为6-16μm,所述模胚的硬质合金均由WC粉、Co粉和VC粉构成,其中WC粉粒径d 为0.6-6μm。
  6. 根据权利要求1所述的梯度硬质合金钻尾模,其特征在于,所述卸料槽为横槽。
  7. 根据权利要求1至6所述任一权利要求的梯度硬质合金钻尾模,其特征在于,所述模胚与底座左侧面的交线轮廓呈多边形,或者由多段弧线组成,或者由多段曲线组成,或者由直线和弧线组成,或者由直线和曲线组成,或者由弧线和曲线组成,或者直线、曲线和弧线组成。
  8. 根据权利要求1至6所述任一权利要求的梯度硬质合金钻尾模,其特征在于,所述模胚与底座顶面的交线轮廓呈多边形,或者由多段弧线组成,或者由多段曲线组成,或者由直线和弧线组成,或者由直线和曲线组成,或者由弧线和曲线组成,或者直线、曲线和弧线组成。
  9. 根据权利要求1至6所述任一权利要求的梯度硬质合金钻尾模,其特征在于,所述模胚的纵剖面轮廓大小从左向右始终相等。
  10. 根据权利要求1至6所述任一权利要求的梯度硬质合金钻尾模,其特征在于,所述模胚的纵剖面轮廓大小从左向右不是始终相等。
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