CN113579081A - Thermoforming laminated water-cooling mold of high-strength steel plate - Google Patents
Thermoforming laminated water-cooling mold of high-strength steel plate Download PDFInfo
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- CN113579081A CN113579081A CN202110885832.6A CN202110885832A CN113579081A CN 113579081 A CN113579081 A CN 113579081A CN 202110885832 A CN202110885832 A CN 202110885832A CN 113579081 A CN113579081 A CN 113579081A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a water-cooling die for hot forming laminated production of high-strength steel plates. Including from the bottom up range upon range of the mould lower floor, mould intermediate level, the mould superiors of arranging in proper order, spiral cooling pipeline and linear type pipeline have been seted up to mould lower floor inside, and the groove structure that the fretwork link up is seted up in the middle of the mould intermediate level as mould intermediate level water course, sets up mould intermediate level water passage wall around the mould intermediate level water course, and mould intermediate level water passage wall all is provided with annular sealed recess at the edge of connecting mould lower floor and mould superiors' terminal surface. The invention can efficiently take away the heat in the die aiming at the characteristics of the thermal forming water-cooling die, realize the quenching of the workpiece and simultaneously ensure the high strength and high pressure maintaining capability required by the die.
Description
Technical Field
The invention relates to a water-cooling mold, in particular to a heat forming laminated water-cooling mold for a high-strength steel plate, and belongs to heat forming molds.
Background
The hydro-thermal forming process is greatly concerned by the industry all the time, and has great market potential and high technical threshold in terms of efficient heat dissipation of a die and how to deal with the existing quick quenching technology of high-temperature parts in a high-pressure stress environment. Taking a steel plate material as an example, the specific process is that a workpiece which is subjected to blanking, preforming, trimming and punching by a cold stamping line is sent into a heating furnace to be heated to austenitizing, then sent into an indirect hot forming die to be subjected to shape keeping and quenching to generate martensite, and finally cleaned and oiled.
One of the most difficult places for the overall process is the cooling of the thermoforming mold itself. If the heat dissipation of the die is not in place, the workpiece which is just processed can obtain good quenching effect, and then the quenching effect of the workpiece can be deteriorated along with the increase of the temperature of the die. Even pearlite, ferrite, and the like are generated, which are not favorable for the performance of the workpiece.
Another difficulty is that the surface strength of the mold can withstand the large compressive stress generated during mold clamping and pressure holding without deformation.
At present, the hot forming technology is rarely researched at home and abroad, and as shown in fig. 1 and 2, a block water chamber communication structure or a conformal water channel structure is adopted. The strength of the two dies is poor, and the maintenance is difficult; is suitable for the technical products with small die pressure and has the defect of irreparability.
Disclosure of Invention
In view of the above situation, the present invention provides a thermoforming laminated water-cooling mold, in which a separate spiral water channel design and a laminated water channel design are added. The cooling speed of the hot forming die is greatly increased, the cooling speed of the hot forming workpiece is increased, the quenching effect is improved, and the problem of poor surface strength of the conventional die can be solved.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
the die comprises a die lowermost layer, a die intermediate layer and a die uppermost layer which are sequentially arranged from bottom to top in a stacking manner, wherein the die lowermost layer and the die intermediate layer as well as the die intermediate layer and the die uppermost layer are slidably embedded through mortise and tenon structures; a spiral cooling pipeline and a linear pipeline are arranged in the lowermost layer of the die, and two ends of the spiral cooling pipeline and the linear pipeline respectively penetrate through the end surfaces of two sides of the lowermost layer of the die; the mold middle layer is provided with a hollow-out through groove structure as a mold middle layer water channel, a mold middle layer water channel wall is arranged around the mold middle layer water channel, a middle layer water inlet and a middle layer water outlet are respectively arranged on the outer end faces of two sides of the mold middle layer water channel wall, and annular sealing grooves are respectively arranged on the edges of the mold middle layer water channel wall connecting the lowermost layer of the mold and the uppermost layer end face of the mold.
The mould lower floor inside seted up twice spiral cooling tube and one linear type pipeline, spiral cooling tube's axial is on a parallel with the linear type pipeline and arranges, twice spiral cooling tube is located the both sides of one linear type pipeline.
The spiral cooling pipeline is internally provided with a spoiler, the spoiler is arranged along the spiral axis in the spiral cooling pipeline, and the length of the spoiler is the same as that of the spiral cooling pipeline.
The water-cooled die is inverted in practical use, the lowermost layer of the die is positioned at the uppermost part and is connected to the bottom surface of the tail end of the forging press, and the uppermost layer of the die is positioned at the lowermost part and is used for contacting and forging the workpiece.
The top surface of the uppermost layer of the die is provided with a protruding structure used for being pressed on the upper surface of a workpiece.
The water channel of the middle layer of the die is mainly composed of a plurality of plane right-angle bend grooves.
The cooling liquid enters the water channel of the middle layer of the die, flows through the plane right-angle bend groove and is changed from laminar flow to turbulent flow, and heat exchange is enhanced.
The invention can efficiently take away the heat in the die aiming at the characteristics of the thermal forming water-cooling die, realize the quenching of the workpiece and simultaneously ensure the high strength and high pressure maintaining capability required by the die.
The existing die does not have good pressure maintaining capability during forging and is easy to deform by high temperature and high pressure. The die has good pressure maintaining capacity during forging, and is not easy to deform by a high-temperature and high-pressure die during forging.
Compared with the existing indirect thermal forming die, the invention has the following advantages:
the invention adopts a laminated structure, has a layered cooling effect compared with the traditional integral (casting) mould, separates the original integral mould core into a plurality of blocks, and properly cools each block, thereby greatly improving the cooling efficiency and meeting the requirement that the hot-formed mould needs to be cooled quickly.
Compared with the mold cooled by a communicated water chamber in the figure 1, the mold provided by the invention has high surface strength, and is particularly suitable for high pressure maintaining capacity required by thermoforming.
The installation and the dismantlement are convenient, can design the structure of intermediate level water runner properly according to the unsmooth condition of mould processing profile, and the cooling die cavity of rational arrangement can improve the commonality of mould, also can promote the quenching efficiency of work piece greatly.
Drawings
FIG. 1 is a three-view diagram of the structure of an insert of a prior art water chamber structure water-cooled mold; (a) showing a top perspective view, (b) showing a bottom perspective view;
FIG. 2 is another block diagram of an insert of a prior art conformal water cooled die; (a) showing a side view, (b) showing a perspective view;
FIG. 3 is a schematic view of the overall assembly of the hot formed stacked water cooled mold of the high strength steel plate of the present invention; (a) representing a top view, (b) representing a front side view, (c) representing a side view;
FIG. 4 is a schematic diagram of the structure of the intermediate layer of the hot-forming stacked water-cooling mold for a high-strength steel plate according to the present invention; (a) representing a top view, (b) representing a front side view, (c) representing a side view;
FIG. 5 is a schematic view of the lowermost layer structure of the hot-formed stacked water-cooled mold for a high-strength steel sheet according to the present invention; (a) representing a top view, (b) representing a front side view, (c) representing a side view;
fig. 6 is a perspective view of an application example structure of the present invention.
In the figure: a spiral cooling pipeline water inlet (1), a linear pipeline water inlet (2), a mold lowest layer (4), a mold middle layer (5), a mold uppermost layer (6), a spiral cooling pipeline water outlet (7) and a linear pipeline water outlet (8); a middle layer water inlet (13), a middle layer water outlet (15), a mold middle layer water channel wall (16), a mold middle layer water channel (17) and a sealing groove (18).
Detailed Description
The present invention will be described in further detail with reference to the attached drawings in the following embodiment examples, and it is obvious that the embodiment described is only a part of the embodiment examples of the present invention, and not all of the embodiment examples.
As shown in fig. 3, the mold comprises a lowermost mold layer 4, a middle mold layer 5 and an uppermost mold layer 6 which are sequentially stacked and closely arranged from bottom to top, and the lowermost mold layer 4 and the middle mold layer 5 and the uppermost mold layer 6 are slidably embedded through mortise and tenon structures.
As shown in fig. 5, a spiral cooling pipeline and a linear pipeline are arranged inside the lowermost layer 4 of the mold, and two ends of the spiral cooling pipeline and the linear pipeline respectively penetrate through end faces of two sides of the lowermost layer 4 of the mold.
The end surfaces of two sides of the lowest layer 4 of the die are respectively provided with a spiral cooling pipeline water inlet 1 and a spiral cooling pipeline water outlet 7, and the inlet and the outlet of the spiral cooling pipeline are respectively connected with the spiral cooling pipeline water inlet 1 and the spiral cooling pipeline water outlet 7. Linear pipeline water inlet 2 and linear pipeline delivery port 8 have been seted up respectively to the both sides terminal surface of mould lower floor 4, and linear pipeline water inlet 2 and linear pipeline delivery port 8 are connected respectively to the entry and the export of linear pipeline.
As shown in fig. 4, a groove structure of a hollow pipeline is formed in the middle of the mold middle layer 5 to serve as a mold middle layer water channel 17, a mold middle layer water channel wall 16 is arranged around the mold middle layer water channel 17, the mold middle layer water channel wall 16 encloses the mold middle layer water channel 17, a middle layer water inlet 13 and a middle layer water outlet 15 are respectively formed in the outer end faces of two sides of the mold middle layer water channel wall 16, annular sealing grooves 18 are respectively formed in the edges of the mold middle layer water channel wall 16, which are connected with the end faces of the lowermost layer 4 and the uppermost layer 6 of the mold, and the sealing grooves 18 are connected with the end faces of the lowermost layer 4 and the uppermost layer 6 of the mold in a sealing mode through sealing rings.
The sealing groove 18 can be a rectangular concave-convex groove type, and the leakage of the cooling water of the die is effectively prevented.
The lowermost layer 4, the intermediate layer 5 and the uppermost layer 6 of the die share sealing and positioning through the mortise and tenon concave-convex groove shapes on the periphery and the embedded sealing rings.
Two spiral cooling pipelines and a linear pipeline are arranged in the lowermost layer 4 of the die, the axial direction of each spiral cooling pipeline is parallel to the linear pipeline, and the two spiral cooling pipelines are located on two sides of the linear pipeline.
The spiral cooling pipeline is internally provided with a spoiler, the spoiler is arranged along the spiral axis in the spiral cooling pipeline, and the length of the spoiler is the same as that of the spiral cooling pipeline.
The water cooled die is inverted in use with the lowermost die layer 4 uppermost and attached to the end bottom of the forging press and the uppermost die layer 6 lowermost for contacting and forging the workpiece.
The top surface of the uppermost layer 6 of the die is provided with a convex structure which is used for being pressed and connected to the upper surface of a workpiece.
The water channel 17 in the middle layer of the mould is mainly composed of a plurality of plane right-angle bend grooves. The two ends of the water channel 17 in the middle layer of the mold are hollowed out and respectively sealed by the lowermost layer 4 and the uppermost layer 6 of the mold, so that a cooling water containing cavity is formed.
The cooling liquid enters the mold middle layer water channel 17 from the middle layer water inlet 13, flows out of the mold middle layer water channel 17 from the middle layer water outlet 15, flows through the plane right-angle bend groove and is changed from laminar flow to turbulent flow, and heat exchange is enhanced.
As shown in fig. 4, the water channel 17 in the middle layer of the mold is divided into two M-shaped through grooves symmetrically distributed on both sides, and the inflection points of the M-shaped through grooves are right-angle inflection points, so that a right-angle bend is formed, and both ends of the M-shaped through grooves are respectively communicated with the water inlet 13 in the middle layer and the water outlet 15 in the middle layer. In specific implementation, each M-shaped through groove is further divided into two through grooves consisting of a large U-shaped groove and a small U-shaped groove, and the two through grooves consisting of the large U-shaped groove and the small U-shaped groove are connected in series and communicated.
The whole main cooling water channel of the die is formed by combining an upper layer structure, a middle layer structure and a lower layer structure, is of a quadrilateral structure, and adopts a large number of plane right-angle bends.
The upper layer and the lower layer realize the sealing and the positioning of the die through the concave-convex rectangular groove and the high-temperature-resistant sealing ring. The middle layer can be combined with the upper layer and the lower layer to form a cooling water cavity and also has the function of bearing and supporting.
The lowest layer 4 of the mould can adopt a fusion casting type structure, a spiral pipeline is embedded in the casting mould for casting and forming, and a special turbulence device can be placed in the pipeline.
In the specific implementation:
the uppermost layer 4 of the die is a die surface and is in direct contact with a high-temperature workpiece which is prefabricated. The surface shape of the uppermost layer 4 of the die is the same as that of the workpiece, the workpiece is directly contacted with a high-temperature workpiece during working, and when the workpiece is quenched, the workpiece and the cooling die surface generate heat exchange, and the temperature of the cooling die surface is increased.
The lowermost layer 6 of the mould is an ingot with a spiral embedded pipeline, the upper surface of the mould is provided with a rectangular convex groove, and the mould can be embedded with a rectangular groove on the lower surface of the middle layer, so that a high-temperature sealing ring is matched, cooling water is effectively prevented from being leaked, and the mould also can play a role in positioning.
The mold middle layer 5 is designed as a detachable water flow channel module, the step layout of a water channel can be adjusted along with the unevenness of the surface of the mold, the heat at the heat concentration part is effectively taken away, and the temperature is reduced. The cooling water flowing in the middle layer 5 of the mold takes the heat out of the mold to finish the rapid cooling of the mold.
The design of the water channel 17 in the middle layer of the mold can be related to the surface roughness of the processed workpiece, and the design of the water channel on the convex working surface can enable more water to flow through so as to guarantee the cooling rate.
As shown in fig. 6, the three layers are combined to form a middle layer water chamber in the middle layer water channel 17 of the mold. The water cooling device is provided with two paths, and cooling water enters and exits the die from the hose and the interface through the pipeline embedded in the lowermost layer of the die and the intermediate layer water chamber respectively and is connected with the outside through the hose interface.
The most important cooling water channel is formed by laminating three layers, namely an uppermost layer 6, a middle layer 5 and a lowermost layer 4, the distance between the die surface and the cooling water channel is different according to the height of the concave-convex shape of the die surface, and the heat transfer on the convex surface is slower than that on the concave surface, namely, the convex surface is easier to generate heat concentration. For these regions, the surface strength of the convex surface may be greater than the strength of the concave surface due to the thickness of the mold surface. In the middle layer 5 of the cooling water channel structure, a wider water flow channel is designed in the area of the convex surface, so that a larger cooling water chamber is formed in operation, and conversely, the water flow channel is designed to be slightly narrower in the area of the concave surface, so that a smaller water chamber is formed. Besides determining the width and shape of the water channel, the middle layer structure 5 also plays a bearing role in the rest part, and the strength of the die is ensured. The structure can effectively reduce the damage of deformation and the like to the surface of the die due to the fact that the strength of a certain position of the forging and pressing piece is too high or the resilience force of the forging and pressing piece acts on the die in a reaction mode when the forging and pressing piece is pressed and pressed. In addition, in the process of forging and pressing, as in the water chamber design shown in the figure I, the cooling water chamber is deformed due to the overhigh forging pressure, so that the die can be disabled, but the die does not need to worry about the damage of the die due to the overhigh pressure protection because of the unique design of the die. Parts that are thicker and have a high spring-back force can be forged.
In addition, the design of the water flow channel is different from the structures of other cooling molds, and the water flow channel does not adopt a smooth water channel of most molds, but adopts a plane vertical structure. Because the cross section of the flow channel changes suddenly, water flow impact is generated, the original water flow is converted into a turbulent flow state from a laminar flow state, and the water flow channel and the large water chamber structure are adopted at the heat concentration position of the die, so that heat can be brought out by cooling water more easily.
The water channel in the lowest layer 4 of the mould is of a spiral structure and is formed by casting after a pipeline is bent into a spiral shape. Spiral pipeline 1 structure bearing capacity is good, and heat exchange area is big, and the vortex generator can also be put into to the pipeline inside, lets the laminar flow that produces easily in the original circular pipeline become the torrent, greatly increased heat-sinking capability. The inflow and outflow of the cooling water are both through the hose and the hose connector, and the water flow can be adjusted according to the heat dissipation requirement.
The whole upper die is divided into three parts, each part is provided with a respective cooling structure, cooling water flows through the parts to take away heat, and the inflow and outflow of the cooling water pass through the hose and the connector thereof, so that the water flow in a large range can be borne. Compared with the traditional water-cooling mold, the mold disclosed by the invention is more suitable for the requirements of higher pressure maintaining capacity and stronger water-cooling capacity required by a thermal forming water-cooling mold.
While the preferred embodiments of the present invention have been described in detail, it is to be understood that the invention is not limited thereto, and that various equivalent modifications and substitutions may be made by those skilled in the art without departing from the spirit of the present invention and are intended to be included within the scope of the present application.
Claims (7)
1. The utility model provides a hot forming stack formula water cooling mould of high strength steel board which characterized in that: the die comprises a die lowermost layer (4), a die intermediate layer (5) and a die uppermost layer (6) which are sequentially stacked from bottom to top, wherein the die lowermost layer (4) and the die intermediate layer (5) as well as the die intermediate layer (5) and the die uppermost layer (6) are slidably embedded through mortise and tenon structures; a spiral cooling pipeline and a linear pipeline are arranged in the lowermost layer (4) of the mold, and two ends of the spiral cooling pipeline and the linear pipeline respectively penetrate through the end faces of two sides of the lowermost layer (4) of the mold; the die intermediate layer (5) in the middle of the groove structure is provided with a hollowed-out through groove structure as a die intermediate layer water channel (17), a die intermediate layer water channel wall (16) is arranged around the die intermediate layer water channel (17), the outer end faces of two sides of the die intermediate layer water channel wall (16) are respectively provided with an intermediate layer water inlet (13) and an intermediate layer water outlet (15), and the edges of the die intermediate layer water channel wall (16) connecting the die lowermost layer (4) and the die uppermost layer (6) are respectively provided with an annular sealing groove (18).
2. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 1, wherein: the mould lower most layer (4) inside seted up twice spiral cooling pipe and a linear type pipeline, spiral cooling pipe's axial is on a parallel with the linear type pipeline and arranges, twice spiral cooling pipe is located the both sides of a linear type pipeline.
3. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 1, wherein: the spiral cooling pipeline is internally provided with a spoiler, the spoiler is arranged along the spiral axis in the spiral cooling pipeline, and the length of the spoiler is the same as that of the spiral cooling pipeline.
4. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 1, wherein: the water-cooled die is inverted in practical use, the lowermost layer (4) of the die is positioned at the uppermost part and is connected to the bottom surface of the tail end of the forging press, and the uppermost layer (6) of the die is positioned at the lowermost part and is used for contacting and forging the workpiece.
5. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 4, wherein: the top surface of the uppermost layer (6) of the die is provided with a raised structure which is used for being pressed on the upper surface of a workpiece.
6. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 1, wherein: the mold middle layer water channel (17) is mainly composed of a plurality of plane right-angle bend grooves.
7. The hot-forming stacked water-cooling mold for high-strength steel plates according to claim 6, wherein: the cooling liquid enters a water channel (17) in the middle layer of the die, flows through the plane right-angle bend groove and is changed from laminar flow to turbulent flow, and the heat exchange is enhanced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110885832.6A CN113579081A (en) | 2021-08-03 | 2021-08-03 | Thermoforming laminated water-cooling mold of high-strength steel plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110885832.6A CN113579081A (en) | 2021-08-03 | 2021-08-03 | Thermoforming laminated water-cooling mold of high-strength steel plate |
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| CN113579081A true CN113579081A (en) | 2021-11-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201361693Y (en) * | 2009-03-17 | 2009-12-16 | 沈阳新光华旭铸造有限公司 | Cylinder cover die with cooling structure |
| JP2011037051A (en) * | 2009-08-07 | 2011-02-24 | Hitachi Maxell Ltd | Mold, method for producing molding using mold, tape reel, and tape cartridge |
| CN203541264U (en) * | 2013-09-14 | 2014-04-16 | 中国第一汽车股份有限公司 | Mould insert for thermal forming of ultrahigh-strength parts |
| CN103895178A (en) * | 2014-03-31 | 2014-07-02 | 华南理工大学 | Special-shaped water channel followed cooling injection molding mold |
| CN104441518A (en) * | 2014-12-02 | 2015-03-25 | 无锡银邦精密制造科技有限公司 | Cooling water channel structure of circular box injection mold |
| CN206868936U (en) * | 2017-06-27 | 2018-01-12 | 重庆理工大学 | Mold cooling water road is set and sealing structure |
-
2021
- 2021-08-03 CN CN202110885832.6A patent/CN113579081A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201361693Y (en) * | 2009-03-17 | 2009-12-16 | 沈阳新光华旭铸造有限公司 | Cylinder cover die with cooling structure |
| JP2011037051A (en) * | 2009-08-07 | 2011-02-24 | Hitachi Maxell Ltd | Mold, method for producing molding using mold, tape reel, and tape cartridge |
| CN203541264U (en) * | 2013-09-14 | 2014-04-16 | 中国第一汽车股份有限公司 | Mould insert for thermal forming of ultrahigh-strength parts |
| CN103895178A (en) * | 2014-03-31 | 2014-07-02 | 华南理工大学 | Special-shaped water channel followed cooling injection molding mold |
| CN104441518A (en) * | 2014-12-02 | 2015-03-25 | 无锡银邦精密制造科技有限公司 | Cooling water channel structure of circular box injection mold |
| CN206868936U (en) * | 2017-06-27 | 2018-01-12 | 重庆理工大学 | Mold cooling water road is set and sealing structure |
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Application publication date: 20211102 |