CN110695178A - Thermal stretching method and device for medium-thickness steel plate - Google Patents
Thermal stretching method and device for medium-thickness steel plate Download PDFInfo
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- CN110695178A CN110695178A CN201911128697.XA CN201911128697A CN110695178A CN 110695178 A CN110695178 A CN 110695178A CN 201911128697 A CN201911128697 A CN 201911128697A CN 110695178 A CN110695178 A CN 110695178A
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
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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
- B21D37/10—Die sets; Pillar guides
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a hot extension device of a medium steel plate and a processing method thereof, belonging to the technical field of metal pressure processing; the device comprises a lower template (1), a male die (3), a female die (9), a gland (8) and an upper template (7); the lower template is fixedly connected with the male die and then fixedly connected with the lower working table top of the cold pressing equipment; the upper template is fixedly connected with the gland and the female die and then fixedly connected with the working table top of the cold pressing equipment; the male die is used for determining the internal shape of the part, and the female die is used for determining the shape of the side wall of the external shape of the part; the gland is used to determine the top shape of the part profile. When parts are processed, the blank is heated to about 800 ℃ and then placed on a male die for hot drawing forming, and the die clearance is the normal temperature clearance plus the material thickness corresponding to the blank shrinkage rate. Compared with the prior art, the invention realizes the one-time stretching forming of the medium-thickness steel plate processing cylinder parts, improves the processing precision and the processing efficiency, has convenient operation, ensures that the part qualification rate reaches 100 percent, has beautiful appearance and is convenient for mass production.
Description
Technical Field
The invention belongs to the technical field of metal pressure processing, relates to a hot stretching device, and particularly relates to a hot stretching method and device for a medium-thickness steel plate.
Background
The existing processing method is generally divided into two types, namely, the existing processing method is that a flanged deep cylinder structural part of a high-strength medium-thickness steel plate with the thickness of 8mm as shown in figure 1 needs to be processed: hot forging and normal temperature stamping.
In the case of hot forging, when a blank of a part is forged, the forging temperature range of the blank of a part is generally from the start forging temperature of about 1250 ℃ to the finish forging temperature of about 800 ℃, and the material is in an austenite state with good plasticity during the forging. However, the forging process results in a thick scale, requires a large machining allowance for the part, and cannot forge a plate and a deep cylindrical part.
For normal temperature stamping, similar processing of the extension piece, the material is generally low carbon steel, sigma b is less than or equal to 600MP, sigma s is less than or equal to 380MP, and delta is greater than or equal to 26 percent.
In conclusion, for the processing of the flanged deep cylinder structure part of the high-strength medium-thickness steel plate, if the forging method is adopted for processing, the requirements of the finished product on the profiling depth and the uniform thickness can not be met; if cold pressing devices are adopted for stretching, the stretching is unsuccessful only once, the strength of a steel plate is too high, or a die is damaged or a machine tool is overloaded; therefore, the existing equipment and method can not process parts meeting the technical index requirements, and a set of practical and feasible equipment and method must be designed for processing the parts.
Disclosure of Invention
The invention aims to overcome the limitation of the prior art, solve the processing problem of a deep cylinder structure part with a flange of a high-strength medium-thickness steel plate and provide a method and a device for hot drawing of the medium-thickness steel plate.
The purpose of the invention is realized by the following technical scheme.
A thermal stretching device for a medium steel plate comprises a lower template, a male die, a female die, a gland and an upper template;
the lower template is fixedly connected with the male die and then fixedly connected with a lower working table top of cold pressing equipment;
the upper template is fixedly connected with the gland and the female die and then fixedly connected with a working table top on cold pressing equipment;
the male die is used for determining the internal shape of the part;
the female die is used for determining the shape of the side wall of the part shape;
the gland is used to determine the top shape of the part profile.
Preferably, the device further comprises a stripper plate and an ejector rod, wherein the stripper plate is used for pressing the part blank and the female die tightly and can move up and down along with the female die to prevent the part from wrinkling on the periphery; the ejector rod is used for jacking the stripper plate through being fixedly connected with the stripper plate from the lower side.
Preferably, the device further comprises a guide post and a guide pipe, wherein the guide post and the guide pipe are respectively connected with the upper template and the lower template in a retention mode and used for providing guidance for the upper template and the lower template during movement and ensuring that the clearance value of the male die and the clearance value of the female die are uniformly fixed.
Preferably, the lower template and the male die are fixedly connected in a fixed mode through interference fit.
Preferably, the component is a flanged deep cylinder structure.
Preferably, the part of the device, which is in contact with the part, is made of a hot-working die metal material, and the part of the device, which is not in contact with the part, is made of a hard metal material.
Preferably, the part of the device in contact with the part is formed by forging heat treatment using a 5CrMnMo steel.
Preferably, the centers of the lower template, the male die, the gland and the upper template are all provided with air holes.
The method for processing the parts by using the hot stretching device of the medium-thickness steel plate comprises the steps of heating the part blank to the range of 750-900 ℃, placing the part blank on a male die, and then carrying out hot stretching forming, wherein the die gap is set as the die gap of normal-temperature stretching and the material thickness corresponding to the shrinkage rate of the part blank.
Preferably, the part blank heating temperature is 800 ℃.
A hot drawing device for a medium steel plate comprises a lower template, a male die, a female die, a gland, an upper template, a stripper plate, a mandril, a guide post and a guide pipe;
the lower template fixes the male die through static fit, cuts a Q235 steel plate and processes a static fit hole and a screw hole for fixing the male die and also has two static fit holes with different sizes for fixing the lower half part of the guide pillar;
the material returning plate is used for pressing the part blank and the female die tightly and can move up and down along with the female die to prevent the part from wrinkling on the periphery; the steel plate is formed by cutting a 5CrMnMo steel plate, then performing heat treatment and machining, wherein the center of the steel plate is provided with a through hole matched with the outer edge of a male die for the male die to pass through and move up and down along the outer edge of the male die, and the periphery of the steel plate is provided with threaded holes for fixedly connecting a mandril with the mandril;
the ejector rod is used for jacking the stripper plate by being fixedly connected with the stripper plate from the lower part, a 40Cr type medium carbon steel is adopted for quenching and tempering and then processed into a step shaft structure, and the end part of the ejector rod is processed with threads for fixedly connecting the stripper plate;
the male die is used for determining the internal shape of the part, is formed by forging and heat treating 5CrMnMo steel and is matched with the internal shape of the part;
the guide post is fixed on the lower template and is in static fit, and the guide pipe is fixed on the upper template and is in static fit; the guide post and the guide pipe are in movable fit with each other, are formed by machining and molding round steel and performing surface heat treatment;
the upper template is used for fixing the female die through screws and pins, cutting a Q235 steel plate and processing pin holes and screw holes for fixing the female die;
the gland and the female die are used for determining the appearance of the part, and are formed by forging and heat treatment of 5CrMnMo steel, and the shape of the gland is matched with the appearance of the part;
connection relation:
the method comprises the following steps of firstly, pressing a male die into a lower die plate in a static fit manner and fixing the male die on the lower die plate by using screws, sleeving a stripper plate outside the male die, penetrating a mandril through a through hole of the lower die plate and then screwing the mandril into a screw hole of the stripper plate, and fixing the lower die plate on a lower working table of a punch by using a T-shaped groove of the lower working table of the punch and using a U-shaped pressing plate and a T; and (3) placing the gland in the female die, then loading the gland into the upper template, fixing the upper template on the upper working table surface of the punching machine by using the U-shaped pressing plate and the T-shaped bolts, and respectively pressing the guide pillar and the guide pipe into the lower template and the upper template in a static fit manner.
Advantageous effects
Compared with the prior art, the invention realizes the one-time stretching forming of the medium-thickness steel plate processing cylinder parts, improves the processing precision and the processing efficiency of the parts, has convenient operation, ensures that the qualification rate of the parts reaches 100 percent, has beautiful appearance and is convenient for mass production.
Drawings
FIG. 1 is a perspective view of a part;
FIG. 2 is a schematic structural view of a thermal stretching apparatus for a medium plate according to an embodiment of the present invention;
reference numerals: 1-a lower template; 2-material returning plate; 3-a male die; 4-guide pillar; 5-a catheter; 6-pin; 7-upper template; 8-pressing cover; 9-a female die; 10-a screw; 11-a mandril.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Fig. 2 is a schematic structural view of a thermal stretching device for a medium-thickness steel plate, which comprises a lower template 1, a stripper plate 2, a male die 3, a guide post 4, a guide pipe 5, a pin 6, an upper template 7, a gland 8, a female die 9, a screw 10 and a mandril 11;
the lower template 1 fixes the male die 3 through static fit, and then is fixed on the lower working table of the punch through a U-shaped pressing plate and a T-shaped bolt which are arranged on the punch and a T-shaped groove on the working table of the punch; the lower template is made of hard metal materials, such as a Q235 steel plate which is cut and processed with a static matching hole and a screw hole for fixing the male die, and two static matching holes with different sizes for fixing the lower half part of the guide post 4.
The stripper plate 2 is used for pressing the blank and the female die 9 tightly and can move up and down along with the female die 9 to prevent the part from wrinkling on the periphery; the steel plate is formed by cutting a 5CrMnMo steel plate, then performing heat treatment and machining, wherein the center of the steel plate is provided with a through hole matched with the outer edge of a male die 3 for the male die to pass through and move up and down along the outer edge of the male die, and the periphery of the steel plate is provided with threaded holes for fixedly connecting a push rod 11 with the push rod.
The ejector rod 11 is used for jacking the stripper plate 2 through being fixedly connected with the stripper plate from the lower side, 40Cr type medium carbon steel is quenched and tempered and then processed into a step shaft structure, and the end part of the ejector rod is processed with threads for fixedly connecting the stripper plate 2. The steel is not limited to 40Cr type carbon steel, and may be a medium carbon steel for tempering.
The male die 3 is used for determining the internal shape of the part, is formed by forging and heat treating 5CrMnMo steel and is matched with the internal shape of the part. The steel is not limited to 5CrMnMo steel, and may be any hot-work die steel.
The guide post 4 is fixed on the lower template 1 and is in static fit, and the guide pipe 5 is fixed on the upper template 7 and is in static fit; guide pillar 4 and pipe 5 are the movable fit each other, for round steel car machine-shaping and form through surface heat treatment, guarantee that the device direction is reliable, guarantee that the clearance value of terrace die 3 and die 9 is even fixed, can save the time of adjusting the clearance when installing the mould on the punch press, improve production efficiency. The guide post and guide pipe device has the advantages of high precision of parts extending out, long service life and convenient installation and use.
The upper template 7 is used for fixing the female die 9 through screws and pins, then fixed on the upper working table of the punching machine through a U-shaped pressing plate and T-shaped bolts and a T-shaped groove on the upper working table of the punching machine, and the upper template 7 is made of hard metal materials, such as Q235 steel plates, and pin holes and screw holes for fixing the female die are processed after cutting.
The gland 8 and the female die 9 are used for determining the appearance of the part, are formed by forging and heat treatment of 5CrMnMo steel, and are matched with the appearance of the part. The gland and the female die are of a split structure, so that the processing is convenient, and the gland and the female die are integrally processed to waste materials. The gland is in large clearance fit with the female die, and the step of the female die limits the upper position and the lower position of the gland. The steel is not limited to 5CrMnMo steel, and may be any hot-work die steel.
Connection relation and processing procedure
The method comprises the following steps that firstly, a male die 3 is pressed into a lower die plate 1 in a static fit mode and fixed on the lower die plate through screws to form a lower die assembly, a stripper plate 2 is sleeved into the male die 3, a mandril 11 penetrates through a through hole of the lower die plate 1 and then is screwed into a screw hole of the stripper plate 2, and the stripper plate is fixed on a lower working table of a punch through a T-shaped groove of a working table of the punch by a U-shaped pressing plate and a T-; in the process of processing the parts, a self-contained jacking device on a lower working table surface of the punch is utilized to jack the jacking rod 11 to move up and down along with the jacking rod, so that the stripper plate 2 can move up and down freely; placing the gland 8 on the female die 9 and then loading the gland on the upper template 7 to form an upper die assembly, fixing the upper die assembly on the upper working table of the punching machine by using a U-shaped pressing plate and a T-shaped bolt, starting the punching machine at the moment, adjusting punching process parameters, and supporting the stripper plate 2 by moving the upper jacking device to enable the upper surface of the stripper plate and the upper surface of the male die 3 to be on the same plane; heating a blank to about 800 ℃ (750 ℃ to 900 ℃) and placing the blank on a stripper plate 2 for righting, moving an upper die assembly downwards to enable the blank and the stripper plate 2 to be compressed together and move downwards together to finish the thermal drawing forming of a first part, plugging equal-gap plug pieces between a male die and a female die by utilizing adjusted gaps after confirming that the part meets the requirements, moving the whole device from a punch press in parallel, processing guide post and guide pipe holes together under the condition of ensuring the uniform gap of the device, ensuring the upper part and the lower part to be concentric, and pressing the guide post and the guide pipe into a lower template and an upper template respectively in a static fit mode. The device is installed into the punch again, the punch is started, the device is opened lightly, the die gap does not need to be adjusted, the stroke of the punch is adjusted by utilizing the gap plug piece, and the large-batch hot drawing of medium-thickness steel plates can be realized to process deep cylinder parts. The gap is set as a die gap extending at normal temperature plus the material thickness corresponding to the shrinkage rate of the part blank. That is, when the contraction rate of the 8mm high strength medium steel sheet is 1.2%, the gap thereof should be 8 × 1.2% mm added to the room temperature elongation gap.
In addition, in order to prevent the parts from being sucked with the upper die assembly or the lower die assembly, air holes are formed in the centers of the upper die plate 7, the gland 8, the lower die plate 1 and the male die 3. Meanwhile, the air holes can also be used for ejecting the parts out of the upper die assembly body by using a rod-like tool from the upper part.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the principles of the invention, and these should be considered to fall within the scope of the invention.
Claims (10)
1. The utility model provides a hot draw device of medium plate which characterized in that: comprises a lower template (1), a male die (3), a female die (9), a gland (8) and an upper template (7);
the lower template (1) is fixedly connected with the male die (3) and then fixedly connected with a lower working table top of cold pressing equipment;
the upper template (7) is fixedly connected with the gland (8) and the female die (9) and then fixedly connected with a working table top of cold pressing equipment;
the male die (3) is used for determining the internal shape of the part;
the female die (9) is used for determining the shape of the side wall of the part appearance;
the gland (8) is used for determining the top shape of the part appearance.
2. The apparatus of claim 1, wherein: the device also comprises a stripper plate (2) and an ejector rod (11), wherein the stripper plate (2) is used for pressing the part blank and the female die (9) tightly and can move up and down along with the female die (9) to prevent the part from wrinkling on the periphery; the ejector rod (11) is used for jacking the stripper plate (2) through being fixedly connected with the stripper plate (2) from below.
3. The apparatus of claim 1, wherein: the device also comprises a guide post (4) and a guide pipe (5), wherein the guide post (4) and the guide pipe (5) are respectively fixedly connected with the upper template and the lower template and used for providing guidance for the upper template and the lower template during movement and ensuring that the clearance value of the male die (3) and the female die (9) is uniformly fixed.
4. The apparatus of any of claims 1-3, wherein: the lower template (1) and the male die (3) are fixedly connected in a fixed mode through static fit.
5. The apparatus of claim 4, wherein: the parts are of a deep cylinder structure with flanges.
6. The apparatus of claim 4, wherein: the part of the device, which is in contact with the part, is made of hot-working die metal materials, and the part, which is not in contact with the part, is made of hard metal materials.
7. The apparatus of claim 6, wherein: the part of the device contacted with the part is formed by forging heat treatment by adopting 5CrMnMo steel.
8. The apparatus of claim 4, wherein: air holes are formed in the centers of the lower template (1), the male die (3), the gland (8) and the upper template (7).
9. A method of machining said part with the apparatus according to any one of claims 1 to 8, wherein: and heating the part blank to the range of 750-900 ℃, placing the part blank on the male die (3), and performing hot drawing forming, wherein the die gap is set as the die gap of normal-temperature drawing and the material thickness corresponding to the shrinkage rate of the part blank.
10. The method of claim 9, wherein: the heating temperature of the part blank is 800 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128697.XA CN110695178A (en) | 2019-11-18 | 2019-11-18 | Thermal stretching method and device for medium-thickness steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128697.XA CN110695178A (en) | 2019-11-18 | 2019-11-18 | Thermal stretching method and device for medium-thickness steel plate |
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| CN110695178A true CN110695178A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911128697.XA Pending CN110695178A (en) | 2019-11-18 | 2019-11-18 | Thermal stretching method and device for medium-thickness steel plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222271A (en) * | 2020-09-24 | 2021-01-15 | 中国航发贵州黎阳航空动力有限公司 | Hot stretch forming method of splitter shell |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003094158A (en) * | 2001-09-19 | 2003-04-02 | Japan Steel Works Ltd:The | Nozzle apparatus for metal injection molding machine |
| DE10257144A1 (en) * | 2002-04-03 | 2004-06-24 | Fritz Kortschack | Deep-drawing process for producing hollow articles and packaging comprises molding flexible material in female mold using liquid as male mold |
| CN201271706Y (en) * | 2008-09-27 | 2009-07-15 | 浙江吉利汽车有限公司 | Convex hull sequence for car radiator center support stamping mould |
| CN103878549A (en) * | 2014-03-18 | 2014-06-25 | 安庆索伊特机车部件有限公司 | Press forming technology of housing of filer |
| CN106140924A (en) * | 2016-08-30 | 2016-11-23 | 山西北方机械制造有限责任公司 | A kind of method of extending of high-strength steel plate |
-
2019
- 2019-11-18 CN CN201911128697.XA patent/CN110695178A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003094158A (en) * | 2001-09-19 | 2003-04-02 | Japan Steel Works Ltd:The | Nozzle apparatus for metal injection molding machine |
| DE10257144A1 (en) * | 2002-04-03 | 2004-06-24 | Fritz Kortschack | Deep-drawing process for producing hollow articles and packaging comprises molding flexible material in female mold using liquid as male mold |
| CN201271706Y (en) * | 2008-09-27 | 2009-07-15 | 浙江吉利汽车有限公司 | Convex hull sequence for car radiator center support stamping mould |
| CN103878549A (en) * | 2014-03-18 | 2014-06-25 | 安庆索伊特机车部件有限公司 | Press forming technology of housing of filer |
| CN106140924A (en) * | 2016-08-30 | 2016-11-23 | 山西北方机械制造有限责任公司 | A kind of method of extending of high-strength steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222271A (en) * | 2020-09-24 | 2021-01-15 | 中国航发贵州黎阳航空动力有限公司 | Hot stretch forming method of splitter shell |
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Application publication date: 20200117 |