CN101733512A - Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould - Google Patents
Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould Download PDFInfo
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Abstract
The invention relates to a process technology and a method aiming at the simple, convenient and effective repair welding, restoring and reproducing of a cold-working die, which belongs to the technical field of high-alloy cold-working die steel. In the method, hard-face knife edges or molding shape faces which satisfies the requirements are produced on a failed cold-working die through resurfacing welding mainly by the process steps of the preheating treatment of a die to be restored before repair welding, the adoption of a specific welding wire, the determination of welding high-frequency current, the postweld heat treatment and the like, so the failed die carries out the punching task of more than tens of thousands times again. The method solves the problems of high carbon equivalent and difficult welding of high-alloy steel, recycles the failed die of a producer after repair welding and restoration, can enhance the service life of the die, reduces the maintenance cost of the die and enhances the production efficiency.
Description
Technical field
The present invention relates to a kind of technology and method of making again at the simple and effective Repair Welding of cold-work die, belong to the cold work die steel in high alloy through technical field.
Background technology
Because cold-work die easily collapses inefficacies such as angle, wearing and tearing, size distortion, cracking in the manufacturing enterprise, it is huge and the production cycle is long to open the expense of Mo Xinmo replacement inefficacy mould fully, so hope is keeped in repair the inefficacy mould to weld these simple and effective means.But nowadays most cold-work dies adopt high-alloy steel, and carbon equivalent high has limited conventional welding wire welding method.So need the special Repair Welding re-manufacturing technology of exploitation, solve the cold work die steel in high alloy through maintenance difficult problem that enterprise faces, thereby reduction cold-work die maintenance cost improve die life.
Summary of the invention
The process that the object of the present invention is to provide a kind of simple and effective Repair Welding at cold work die steel in high alloy through commonly used to make again is characterized in that having following process and step:
A. the preheating of mould to be repaired: with to be repaired before soldering 300-370 ℃ of following preheating insulation 1～2 hour, ftracture when evaporating oil stain and avoiding the mould soldering;
B. welding wire is selected for use: the common stiff dough edge of a knife of mould is adopted No. 2 welding wire thin layers back No. 1 welding wire built-up welding edge of a knife shape face that feels secure; The finishing die repairing sizes adopts No. 3 welding wires; Inside was adopted No. 2 welding wires connections and is made stiff dough on the top layer with No. 1 welding wire when the mould bonding that ruptures was repaired; No. 4 welding wires are adopted in the stiff dough edge of a knife built-up welding that special high hardness high toughness requires;
Welding wire numbering and composition are as shown in the table:
C. determine current parameters: adopt the tungsten argon arc welding machine, use high frequency electric 100-150 ampere; Set electric current on the low side during near the die surface built-up welding, set higher electric current during away from the mould built-up welding;
D. post weld heat treatment: weld deposit process was controlled in 25-30 minute, allowed weld seam air cooling 5-10 minute after finishing earlier; Carry out 2-3 hour post weld heat treatment of 300-370 ℃ of insulation then,, prevent in the use that stress concentrates and ftracture to discharge sweating heat stress; Thereby make overlay cladding carry out temper simultaneously and improve toughness.
Its steel grade alloying component of high-alloy cold-working mould described in the present invention is as shown in the table:
| Steel grade | ??C | ??Si | ??Mn | ??Cr | ??Mo | ??V | ??P | ??S |
| ??Cr12 | ??2.00-2.30 | ??≤0.40 | ??≤0.40 | ??11.50-??13.00 | ??≤0.030 | ??≤0.030 | ||
| ??Cr12MoV | ??1.45-1.70 | ??≤0.40 | ??≤0.40 | ??11.00-??12.50 | ??0.40-??0.60 | ??0.15-0.30 | ??≤0.030 | ??≤0.030 |
| ??SKD11 | ??1.40-1.60 | ??0.15-0.35 | ??0.30-0.60 | ??11.00-??13.00 | ??0.70-??1.20 | ??0.50-1.10 | ??≤0.030 | ??≤0.030 |
| ??Cr12Mo1V1??(D2) | ??1.40-1.60 | ??≤0.60 | ??≤0.60 | ??11.00-??13.00 | ??0.70-??1.20 | ??≤1.10 | ??≤0.030 | ??≤0.030 |
| ??Cr8Mo2SiV??(DC53) | ??0.90-1.10 | ??0.80-1.20 | ??0.10-0.60 | ??7.00-??9.50 | ??2.30-??3.00 | ??0.25-0.40 | ??≤0.030 | ??≤0.030 |
The inventive method is applicable to the Cr12 through Q-tempering, Cr12MoV (SKD11), Cr12Mo1V1 (D2), Cr8Mo2SiV cold work die steel in high alloy through commonly used such as (DC53).
Respectively number the characteristic of welding wire among the present invention and select for use according to as described below:
No. 1 welding wire: be applicable to the welding wire of making the stiff dough edge of a knife, carbon content is the principal element that influences weldability, so the welding wire carbon content has obtained low carbon equivalent and guaranteed good weldability far below matrix.In order to reach enough hardness, the Si and a certain amount of Mn that add high level play the solution strengthening effect, and deoxidation in the welding wire process of setting.A large amount of Cr can form carbide reinforced weld seam matrix; A small amount of adding of Mo and V has improved overlay cladding intensity and impact flexibility.
No. 2 welding wires: mainly play the bonding matrix and the stiff dough edge of a knife.Contain the austenite that a large amount of Cr and Ni become welding wire not undergo phase transition in the temperature-fall period.The very low and hardening constituent element of carbon content has only Mn and a spot of Si, make postwelding hardness far below the cold work die steel requirement, but caking property is fine, is applicable to prime coat or bonding fracture mould.
No. 3 welding wires: be applicable to the welding wire of repairing forming face.Carbon content and No. 1 welding wire are approaching, and Si and Cr content reduce obviously, can increase the intensity and the wearability of weld seam but added W formation hard tungsten carbide, and suitably improve Mo content and further improved intensity and toughness.
No. 4 welding wires: further increase the content of C, W, improve weld hardness and wearability greatly, and the increase by Mo, V guarantees the toughness of weld seam that performance is all better than No. 1 and No. 3 welding wires, is applicable to the Repair Welding occasion that performance requirement is high.
Advantage of the present invention and effect:
By weld preheating insulation and post weld heat treatment, discharge the thermal stress of heat affected area, reduce the adverse effect of heat affected area to mould, do not ftracture in the use of protection mould postwelding; Choose the collocation of suitable welding wire and welding wire and make the Weld Performance excellence; The high electric current of high frequency shortens soldering time increase overlay cladding cooling rate and raises the efficiency.
The specific embodiment
After now specific embodiments of the invention being described in.
Embodiment 1: the aging mould of being repaired in this example is the Cr12MoV side cut cold-work die through 1040 ℃ of 210 ℃ of insulations tempering in 2 hours 2 times of quenching, this mould is through repeatedly repairing and just using number of times more than 200,000 times, and the side cut edge of a knife has two to collapse angle and many places crackle and size distortion.Adopt Repair Welding re-manufacturing technology of the present invention that it is carried out following processing.
The operating procedure of the Repair Welding re-manufacturing technology that adopts in the present embodiment is as follows:
(a) preheat temperature and temperature retention time before the soldering: at first the Cr12MoV mold notch is collapsed angle, crackle and the size position that subsides and be polished into smooth built-up welding groove.Aging serious Cr12MoV cold-work die inside has in the micro-crack of a large amount of recessive micro-cracks and die surface contains oil stain; so preheat temperature is selected higher 370 ℃ and is incubated 2 hours, the accident cracking, the evaporation oil stain cleaning that play when protecting mould to avoid soldering are treated built-up welding groove and the effect that improves weldquality.
(b) setting of current parameters: current parameters is set at high frequency electric, high current peak can be accelerated the fusing of welding wire and the formation in molten bath, and actual tungsten electrode average current has only half that shows electric current, can not make mould be subjected to excessive current and the softening embrittlement phenomenon of high tempering takes place.During built-up welding at filler wire with produce that to make die surface be subjected to the heat affecting of electric current under the condition in molten bath as far as possible little.And the electric current on the low side of setting 100 amperes of high frequencies during No. 2 welding wires of built-up welding influences the matrix mold hot reducing, and the higher electric current of setting 150 amperes of high frequencies during No. 1 welding wire of built-up welding increases the cooling velocity of edge of a knife overlay cladding, thereby increases martensite content and improve hardness.
(c) use of welding wire: at first play the effect of bonding matrix and hard-face overlaying welding floor with the good No. 2 welding wires built-up welding one deck on plane to be welded of caking property; In its cooling procedure, knock No. 2 welding wire built-up welding floor and make its densification with hammer; Then No. 1 welding wire is continued the built-up welding layer 2-3 as the stiff dough edge of a knife on No. 2 welding wire built-up welding floor; Beat overlay cladding with hammer after finishing and make dense structure, and allow the overlay cladding air cooling form martensite in 5 minutes.
(d) post weld heat treatment: whole welding repair process was finished in 25 minutes to prevent that excess shrinkage makes the mould cracking in the weld seam temperature-fall period; Carry out 2 hours heat treatments of 370 ℃ of insulations then, thereby make the sweating heat stress release prevent in the mould use that stress concentrates and ftracture, thereby and make overlay cladding carry out temper to improve toughness.
(e) side cut edge of a knife processing:, made the Cr12MoV side cut cold-work die that can continue to use again by above-mentioned Repair Welding technology like this with edge of a knife shape and the size that overlay cladding redundance machining becomes to need.
The Cr12MoV side cut cold-work die of making again by the said method Repair Welding at last, built-up welding edge of a knife hardness reaches 58-60HRC, and is suitable with the edge of a knife hardness of new mould; And inefficacies such as angle, wearing and tearing deformation do not appear ftractureing, collapse in the shearing task of having finished one batch of (20,000) auto parts in actual production, and part quality is identical with new die production.
Embodiment 2: the shaping dies of being repaired in this example is the DC53 cold work die steel through 200 ℃ of insulation tempering in 2 hours 2 times behind 1030 ℃ of oil quenchings, surpasses 100,000 times through repeatedly repairing access times, and forming face has the many places crackle, subside and inefficacy such as size distortion.Adopt Repair Welding re-manufacturing technology of the present invention that it is carried out following processing.
The operating procedure of the Repair Welding re-manufacturing technology that adopts in the present embodiment is as follows:
(a) preheat temperature and temperature retention time before the soldering: at first the position with DC53 die surface crackle and undersize is polished into smooth built-up welding groove; preheat temperature is selected moderate 350 ℃ and is incubated 2 hours, and the accident cracking, the evaporation oil stain cleaning that play when protecting mould to avoid soldering are treated built-up welding groove and the effect that improves weldquality.
(b) setting of current parameters: direct in the built-up welding of the DC53 of original inefficacy die surface because of needing, so set 120 amperes of lower high frequency electrics, the heat affecting that under the condition in filler wire and generation molten bath die surface is subjected to during built-up welding is as far as possible little.
(c) selecting for use of welding wire: select for use No. 3 direct built-up welding of welding wire at crackle groove and the forming face size position that subsides, beat overlay cladding with hammer after built-up welding is finished and make dense structure, and allow the overlay cladding air cooling form martensite in 5 minutes.
(d) post weld heat treatment: whole welding repair process was finished in 25 minutes to prevent to be subjected to welding heat affected in the mould temperature-fall period and is ftractureed; Carry out 2 hours post weld heat treatment of 370 ℃ of insulations then, thereby make the sweating heat stress release prevent in the mould use that stress concentrates and ftracture, thereby and make overlay cladding carry out temper to improve toughness.
(e) forming face processing:, made the DC53 moulding cold-work die that can continue to use again by above-mentioned Repair Welding technology like this with the forming face size that the grinding of overlay cladding redundance becomes to need.
The DC53 shaping cold-work die of making again by the said method Repair Welding at last, built-up welding edge of a knife hardness reaches 59-61HRC, and is suitable with new mould case hardness; And inefficacies such as cracking, the deformation of wearing and tearing and subside do not appear in the shaping production task of having finished one batch of (20,000) auto parts in actual production, and product quality is identical with new die production.
Claims (2)
1. method for quick repair welding, restoring and reproducing of high-alloy cold-working mould is characterized in that having following process and step:
A. the preheating of mould to be repaired: with to be repaired before soldering 300-370 ℃ of following preheating insulation 1～2 hour, ftracture when evaporating oil stain and avoiding the mould soldering;
B. welding wire is selected for use: the common stiff dough edge of a knife of mould is adopted No. 2 welding wire thin layers back No. 1 welding wire built-up welding edge of a knife shape face that feels secure; The finishing die repairing sizes adopts No. 3 welding wires; Inside was adopted No. 2 welding wires connections and is made stiff dough on the top layer with No. 1 welding wire when the mould bonding that ruptures was repaired; No. 4 welding wires are adopted in the stiff dough edge of a knife built-up welding that special high hardness high toughness requires;
Welding wire numbering and composition are as shown in the table:
C. determine current parameters: adopt the tungsten argon arc welding machine, use high frequency electric 100-150 ampere; Set electric current on the low side during near the die surface built-up welding, set higher electric current during away from the mould built-up welding;
D. post weld heat treatment: weld deposit process was controlled in 25-30 minute, allowed weld seam air cooling 5-10 minute after finishing earlier; Carry out 2-3 hour post weld heat treatment of 300-370 ℃ of insulation then,, prevent in the use that stress concentrates and ftracture to discharge sweating heat stress; Thereby make overlay cladding carry out temper simultaneously and improve toughness.
2. a kind of method for quick repair welding, restoring and reproducing of high-alloy cold-working mould as claimed in claim 1 is characterized in that its steel grade alloying component of described high-alloy cold-working mould is as shown in the table:
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| CN2009101995459A CN101733512B (en) | 2009-11-26 | 2009-11-26 | Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould |
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| CN101733512B CN101733512B (en) | 2012-06-13 |
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