CN104438573A - Process for reducing abrasion of hot-formed steel plate punching punch - Google Patents

Process for reducing abrasion of hot-formed steel plate punching punch Download PDF

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Publication number
CN104438573A
CN104438573A CN201410734245.7A CN201410734245A CN104438573A CN 104438573 A CN104438573 A CN 104438573A CN 201410734245 A CN201410734245 A CN 201410734245A CN 104438573 A CN104438573 A CN 104438573A
Authority
CN
China
Prior art keywords
workpiece
hole
punching
hot forming
steel plate
Prior art date
Application number
CN201410734245.7A
Other languages
Chinese (zh)
Inventor
陈扬
孙财
李向荣
杨云龙
Original Assignee
无锡朗贤汽车组件研发中心有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 无锡朗贤汽车组件研发中心有限公司 filed Critical 无锡朗贤汽车组件研发中心有限公司
Priority to CN201410734245.7A priority Critical patent/CN104438573A/en
Publication of CN104438573A publication Critical patent/CN104438573A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/24Perforating, i.e. punching holes
    • B21D28/26Perforating, i.e. punching holes in sheets or flat parts
    • B21D28/265Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template

Abstract

The invention relates to a process for reducing abrasion of a hot-formed steel plate punching punch. The process is characterized by comprising the following process steps: (1) discharging and pre-punching workpiece before hot forming, forming a pre-punching hole in the workpiece, wherein the hole diameter of the pre-punching hole is smaller than that of a workpiece processing hole; (2) hot forming the workpiece; (3) putting the workpiece on a lower die, pressing the workpiece by a pressing plate from the top, punching the workpiece by a punch and a concave die sleeve, wherein the punching position is the pre-punching hole position, so that the final hole with the required hole diameter is formed. When the hole diameter of the pre-punching hole formed in the step (1) cannot meet the hole diameter tolerance requirement, the workpiece is hot formed and pre-punched after the hot forming in the step (2); the hole diameter of the pre-punching hole is smaller than that of the workpiece processing hole; the hole diameter of the pre-punching hole is 0.5mm-5mm smaller than the hole diameter of the workpiece processing hole. By virtue of the process for reducing the abrasion of the hot-formed steel plate punching punch, the abrasion of the punch is effectively reduced under the condition that the extra cost is not increased and the production efficiency is not damaged; the service life of the punch is prolonged.

Description

Reduce the technique of hot forming steel plate pierce punch wearing and tearing
Technical field
The present invention relates to a kind of technique reducing the wearing and tearing of hot forming steel plate pierce punch, the punching technology of especially a kind of high strength after hot forming process and ultrahigh-strength steel plates, belongs to the separation technology field of hot forming steel plate.
Background technology
High-strength steel sheet intensity is high, particularly there is higher comprehensive mechanical property in normalizing or normalizing tempered condition, the application of high-strength steel sheet is the effective means simultaneously guaranteeing lightweight and crashworthiness, is therefore widely used in the construction industry fields such as large ship, bridge, power station equipment, middle high-pressure boiler, high-pressure bottle, rolling stock, hoisting machinery.And hot forming steel plate is as a kind of Newly Sprouted Things, its production technology is different from common high-strength steel sheet, the production technology of hot forming steel plate generally includes shaping and two stages of quench cooled, wherein, shaping stage needs at high temperature once stamping by mould, quench cooled stage needs cool rapidly by controlling certain cooling velocity, thus steel plate is occurred from austenite microstructure to the transformation of martensite microstructure, obtain high intensity and hardness thus, for common boron steel, after hot forming process, its intensity reaches about 1500Mpa.The tensile strength of general high-strength steel sheet is at about 400MPa ~ 450MPa, and namely tensile strength reached 500 MPa ~ 800MPa before hot forming heat steel, heating then can be increased to 1300 ~ 1600 MPa after being shaped, its intensity is 3 ~ 4 times of rolled products of ordinary high-strength steel, its hardness is only second to pottery, but there is the toughness of steel, for common hot forming boron steel steel plate, intensity reaches 1500MPa, percentage elongation is about 5%, considerably beyond the high-strength steel of general significance, its separating technology difficulty is far away higher than general steel plate and common high-strength steel steel plate.
For the punching of hot forming steel plate, due to the intensity of steel plate own and hardness very high, drift wearing and tearing are very serious, finally produce punching burr, affect workpiece quality.For this reason, conventional method is the sintered steel using high rigidity, even on the basis of sintered steel, increase the process for treating surface such as TD, PVD coating, the cost of drift becomes very expensive thus, and the life-span upgrading amplitude of drift not obvious, usually 5,000 ~ 20,000 jig frequency still needs to change drift.
Can be found by hydrostatic pressure when analyzing punching, cause drift wear and tear very serious main cause be punching after workpiece aperture be less than drift size, thus depart from before workpiece at drift, by workpiece, tightly " hoop " firmly.And workpiece punching back aperture is less than drift size, basic reason is, during punching, drift has the radial power to workpiece extruding along aperture, workpiece radial resilience along aperture after punching is broken, thus makes aperture be less than drift size, and by drift, tightly " hoop " firmly.And slight relative to deburring wearing and tearing, punching serious wear, mainly because it is closed curve, has significantly increased the weight of this radial resilience to the anti-constraint of drift radial pull.Drift solutions all at present is all confined to the performance how improving drift material, and does not fundamentally consider how to alleviate and even eliminate this radial resilience.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of technique reducing the wearing and tearing of hot forming steel plate pierce punch being provided, not increasing under the prerequisite that extra cost do not lose production efficiency yet, effectively reducing the wearing and tearing of drift, extend drift service life.
According to technical scheme provided by the invention, the technique of described reduction hot forming steel plate pierce punch wearing and tearing, is characterized in that, comprise following processing step:
(1) before hot forming process, carry out blanking and pre-punched hole processing to workpiece, workpiece obtains pre-punched hole, and the aperture of pre-punched hole is less than the aperture of machining hole needed for workpiece;
(2) hot forming process is carried out to workpiece;
(3) workpiece is placed on counterdie by workpiece (1), after pushing down workpiece by holding pad from top, adopt drift (5) and die case (4) to carry out punching to workpiece (1), the center of punching overlaps with the center of pre-punched hole (2), thus obtains the hole in final required aperture.
Further, when the aperture of the pre-punched hole that step (1) obtains cannot meet hole tolerance require time, after step (2) hot forming process, carry out pre-punched hole after hot forming to workpiece, the aperture of the pre-punched hole obtained is less than the aperture of machining hole needed for workpiece.
Further, described pre-punched hole 0.5mm ~ 10mm less of the aperture of machining hole needed for workpiece.
Further, keep gap between described drift and the punching of die case, this gap is 5% ~ 15% of thickness of workpiece.
Further, the material of described drift selects cold work tool steel SKD11, D2, high-speed steel or sintered steel.
The present invention has following technique effect:
(1) essence of the present invention is for radial resilience during closed curve punching, proposes the solution how reducing radial resilience.Owing to carrying out pre-punched hole before final punching, final punching is that the material in closed curve significantly reduces, the anti-restraining force of radial compression power during punching is also significantly reduced, thus fundamentally reduce radial resilience, after workpiece punching, " hoop " is lived the phenomenon of drift and is fundamentally alleviated, thus finally reduces the wearing and tearing of drift.No matter adopt the drift of which kind of material, drift of the present invention is all much better than the drift service life of not carrying out pre-punched hole process program in service life;
(2) the present invention the blanking process before hot forming can carry out pre-punched hole, because hot forming boron steel steel plate is annealed condition when carrying out blanking before hot forming, intensity and hardness are all very low, be about 1/3 of intensity and hardness after hot forming, now carry out pre-punched hole, be as good as with common stamping, drift long perfomance life.
(3) the present invention can carry out pre-punched hole technique after hot forming, although now workpiece strength and hardness sharply rise, but owing to being pre-punched hole, much lower to the requirement of workpiece quality after punching, only otherwise have influence on the workpiece quality of the final punching of postorder; Drift also increases substantially service life.
Accompanying drawing explanation
Fig. 1 is the schematic diagram before workpiece punching of the present invention.
Schematic diagram when Fig. 2 is workpiece punching of the present invention.
Sequence number in figure: workpiece 1, pre-punched hole 2, holding pad 3, die case 4, drift 5.
Detailed description of the invention
Below in conjunction with concrete accompanying drawing, the invention will be further described.
Embodiment one: a kind of technique reducing the wearing and tearing of hot forming steel plate pierce punch, the material of workpiece: boron steel 22MnB5, thickness 1.6mm, length 400mm, wide 200mm, institute's punching is circular hole, and diameter is 10mm;
Above-mentioned workpiece specifically processes process by following steps:
The first step, carry out blanking and pre-punched hole processing to workpiece before hot forming, blanking size is 400 × 200mm, and pre-punched hole aperture is 7mm;
Second step, carries out hot forming processing to workpiece;
3rd step, according to the final aperture size of workpiece, carries out punching processing to workpiece.
Embodiment two: a kind of technique reducing the wearing and tearing of hot forming steel plate pierce punch, workpiece is automobile B post, and material: boron steel 22MnB5, expects thick 1.2mm, length 1250mm, wide 430mm, and institute's punching is circular hole, and diameter is 12mm;
Above-mentioned workpiece specifically processes process by following steps:
The first step, carry out blanking and pre-punched hole processing to workpiece before hot forming, blanking size is 400 × 200mm, and pre-punched hole aperture is 8mm;
Second step, carries out hot forming processing to workpiece, obtains workpiece B post after hot forming;
3rd step, according to the final aperture size of workpiece, carries out punching processing to workpiece.

Claims (5)

1. reduce a technique for hot forming steel plate pierce punch wearing and tearing, it is characterized in that, comprise following processing step:
(1) before hot forming process, carry out blanking and pre-punched hole processing to workpiece (1), workpiece (1) obtains pre-punched hole (2), the aperture of pre-punched hole (2) is less than the aperture of the required machining hole of workpiece (1);
(2) hot forming process is carried out to workpiece (1);
(3) workpiece is placed on counterdie by workpiece (1), after pushing down workpiece by holding pad from top, adopt drift (5) and die case (4) to carry out punching to workpiece (1), the center of punching overlaps with the center of pre-punched hole (2), thus obtains the hole in final required aperture.
2. the technique reducing the wearing and tearing of hot forming steel plate pierce punch as claimed in claim 1, the aperture of the pre-punched hole (2) that step (1) obtains it is characterized in that: when cannot meet hole tolerance requirement, after step (2) hot forming process, carry out pre-punched hole after hot forming to workpiece (1), the aperture of the pre-punched hole obtained (2) is less than the aperture of the required machining hole of workpiece (1).
3. the technique reducing the wearing and tearing of hot forming steel plate pierce punch as claimed in claim 1 or 2, is characterized in that: the little 0.5mm ~ 10mm in aperture of described pre-punched hole (2) machining hole more required than workpiece (1).
4. the technique reducing the wearing and tearing of hot forming steel plate pierce punch as claimed in claim 1, it is characterized in that: keep gap between the punching of described drift (5) and die case (4), this gap is 5% ~ 15% of workpiece (1) thickness.
5. the technique reducing the wearing and tearing of hot forming steel plate pierce punch as claimed in claim 1, is characterized in that: the material of described drift (5) selects cold work tool steel SKD11, D2, high-speed steel or sintered steel.
CN201410734245.7A 2014-12-08 2014-12-08 Process for reducing abrasion of hot-formed steel plate punching punch CN104438573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410734245.7A CN104438573A (en) 2014-12-08 2014-12-08 Process for reducing abrasion of hot-formed steel plate punching punch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410734245.7A CN104438573A (en) 2014-12-08 2014-12-08 Process for reducing abrasion of hot-formed steel plate punching punch

Publications (1)

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CN104438573A true CN104438573A (en) 2015-03-25

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Application Number Title Priority Date Filing Date
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082313A (en) * 1983-10-12 1985-05-10 Yoshino Kogyosho Co Ltd Method of molding head section of synthetic resin tubular container
CN1571097A (en) * 2004-05-12 2005-01-26 无锡国盛精密模具有限公司 Prepiercing forming method of diaphragm series metal parts
CN101869954A (en) * 2010-06-25 2010-10-27 昆山诚业德精密模具有限公司 Technology for processing stop sheet
CN202316751U (en) * 2011-11-23 2012-07-11 中国重汽集团济南动力有限公司 Fine blanking mould for thick plate
CN102672034A (en) * 2012-04-28 2012-09-19 安徽江南机械有限责任公司 Die for fine punching of connecting bracket and fine punching method
CN102886422A (en) * 2012-10-22 2013-01-23 安徽工业大学 Punching method for improving flanging capability of sheet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082313A (en) * 1983-10-12 1985-05-10 Yoshino Kogyosho Co Ltd Method of molding head section of synthetic resin tubular container
CN1571097A (en) * 2004-05-12 2005-01-26 无锡国盛精密模具有限公司 Prepiercing forming method of diaphragm series metal parts
CN101869954A (en) * 2010-06-25 2010-10-27 昆山诚业德精密模具有限公司 Technology for processing stop sheet
CN202316751U (en) * 2011-11-23 2012-07-11 中国重汽集团济南动力有限公司 Fine blanking mould for thick plate
CN102672034A (en) * 2012-04-28 2012-09-19 安徽江南机械有限责任公司 Die for fine punching of connecting bracket and fine punching method
CN102886422A (en) * 2012-10-22 2013-01-23 安徽工业大学 Punching method for improving flanging capability of sheet

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Application publication date: 20150325

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