CN1701907A

CN1701907A - Thin layer welding repair technology for forging die cavity

Info

Publication number: CN1701907A
Application number: CN 200510018789
Authority: CN
Inventors: 胡道财; 张运军; 曹世金; 余国林
Original assignee: Hubei Tri Ring Forging Co Ltd
Current assignee: Hubei Tri Ring Forging Co Ltd
Priority date: 2005-05-25
Filing date: 2005-05-25
Publication date: 2005-11-30

Abstract

Thin layer repair welding technique for forging mould cavity overcomes the shortcomings in traditional method with much cost, great time consumption and less repair times, which uses series steps comprised integral heating welding, circle-to-mid turns and multiple layers welding of controlling layer thickness to cut repair time and cost obviously, reliable for quality, fit to repair more than ten times and prolong mould service life.

Description

Thin layer welding repair technology for forging die cavity

Technical field

The present invention uses mould about forging, particularly about forging the renovation technique with mould.

Background technology

Forging is one of common technology of engineering goods production, the mould that forges usefulness is the key of formed product, but repeat the brute force of mould is forged during owing to forging, behind the certain hour, the physical dimension that mold cavity all can occur in various degree enlarges, and cracks at some position, after this situation occurring, generally be to adopt the whole repair mode that falls, but the expense of this traditional approach and consuming time all bigger, and the reparation number of times of mould is generally less than 3-5 time.In recent years, the mould repair mode that a kind of direct employing soldering is arranged, be to adopt a kind of high rigidity welding rod that meets the mould requirement, directly be welded in the mold cavity, thereby recover the original size of mold cavity, but this recovery technique is still immature at present complete, be used for a spot of fine cracks etc. repair still can, be used for the reparation that mold cavity whole geometry size enlarges and do not see that complete technical matters is arranged.

Summary of the invention

The objective of the invention is to overcome the high length consuming time of traditional repair mode expense and can repair the few shortcoming of number of times, a kind of thin layer welding repair technology for forging die cavity that can be used for the whole complete maturation of technology of repairing of mold cavity is provided.

Technical scheme of the present invention is: earlier mold cavity is evenly enlarged 3-5mm, then mold integral is heated to 350-400 ℃ and keep this temperature to carry out soldering, welding rod is heated to 300-350 ℃ of maintenance 40-70 minute, naturally be used for soldering after reducing to normal temperature, during electric welding, from the circumferential edge of mold cavity along, in the middle of mold cavity, carry out gradually, finish in the centre at last, and adopt the mode of multilayer welding, every layer of soldering THICKNESS CONTROL is between 0.8-1.5mm, each the layer all from circumferential edge along, in the middle of mold cavity, finish,, then mould is carried out tempering until slightly surpassing the mold cavity original size, temperature 400-500 ℃, tempering insulation time is pressed 1 hour/2.5cm of mould maximum ga(u)ge and is determined that reduce to normal temperature after the tempering naturally, fine finishining mould die cavity is to using size again.

The present invention enlarges with the mode repairing mould die cavity of soldering is whole, makes mold cavity return to original size.Mold integral is heated and can be strengthened weld strength and the internal stress of organizing that reduces in the welding repair process; The welding rod oven dry effect of having heated, and the generation of pore, slag inclusion when avoiding welding; Elder generation's die cavity circumferential edge is carried out soldering gradually during electric welding in the middle of the back, can avoid the generation of undercut phenomenon, and can guarantee the globality and the quality of soldering; Adopt the mode of multilayer welding, can avoid pore, slag inclusion, guarantee the precision of the gross thickness of soldering; Soldering is to slightly surpassing the mold cavity original size, and processing leaves surplus to subsequent fine, guarantees the precision of mould repair; Tempering after the soldering can further be eliminated and organize internal stress.

Owing to adopt the soldering order of mold integral in the middle of heating behind welding, the first circumference, control a series of technical measures such as multilayer welding mode of bed thickness, shortened dramatically repair time of the present invention, expense reduces, repairing quality is reliable, and adopt repairing mould of the present invention, can repair repeatedly more than 10 times, obviously prolong the mould production cycle, reduce production cost.

Description of drawings

Fig. 1 is a soldering program generalized section of the present invention.

The specific embodiment

With reference to shown in Figure 1, earlier mold cavity is evenly enlarged 3-5mm, the general milling machine that adopts mills, then mold integral is heated to 350-400 ℃ and keep this temperature to carry out soldering, welding rod is heated to 300-350 ℃ of maintenance 40-70 minute, naturally be used for soldering after reducing to normal temperature, during electric welding, from the circumferential edge of mold cavity along 1, edge 1 whole circumference has been welded, again based on this circumference, carry out soldering to mold cavity middle 2 gradually, finish middle 2 at last, the similar concentric circles of its soldering track, and the mode of employing multilayer welding, as having welded ground floor 3 earlier among Fig. 1, weld the second layer 4 again, by that analogy, every layer of soldering THICKNESS CONTROL is between 0.8-1.5mm, and each layer is all from the edge 1,2 end in the middle of mold cavity, until slightly surpassing the mold cavity original size, be generally about 1mm, promptly mold cavity carries out tempering with mould then less than the original size of using after the soldering, temperature 400-500 ℃, tempering insulation time is pressed 1 hour/2.5cm of mold thickness and is determined that reduce to normal temperature after the tempering naturally, fine finishining mould die cavity is to the original size of using again.

Mould before the soldering is heated and should inside and outside integral body be reached the requirement temperature range, but not only the surface reaches the requirement temperature, therefore should be according to the volume size and the thickness of mould, guarantee enough warm-up times, in the welding repair process, should note mould is incubated, reduce to as temperature and to require below the temperature, should in time heat to requiring temperature, it should be noted that mould heats too low, be difficult to reach soldering requirement and quality, mould is heated too high, and energy consumption is big, also influences quality of welding repair.

Circumferential edge recited above along 1, edge 1 whole circumference, be meant the circle that the die joint of mould and the whole periphery that die cavity has a common boundary form, this circle is determined according to the product that forges, is not circle in general sense.The similar concentric circles of soldering track recited above also is meant this point.

Welding rod should adopt the high rigidity welding rod that meets the mould requirement, as models such as 545E, 9580E.In the soldering, should note the electric welding electric current, rule of thumb, the electric welding electric current should can make the surfacing of soldering like this than being advisable about the big 15-20A of common electric welding, is convenient to later stage fine finishining.

Tempering insulation time is looked concrete mould and difference, and generally according to the size at mould maximum ga(u)ge position, every 2.5cm calculated by insulation in 1 hour, determined total tempering insulation time.Fine finishining is mainly mills and the integer of polishing, if the size Control during soldering better, can only polish gets final product.

Claims

1. thin layer welding repair technology for forging die cavity, earlier mold cavity is evenly enlarged 3-5mm, then mold integral is heated to 350-400 ℃ and keep this temperature to carry out soldering, welding rod is heated to 300-350 ℃ of maintenance 40-70 minute, naturally be used for soldering after reducing to normal temperature, it is characterized in that: during electric welding, circumferential edge edge (1) from mold cavity, carry out (2) in the middle of mold cavity gradually, finish in middle (2) at last, and the mode of employing multilayer welding, every layer of soldering THICKNESS CONTROL is between 0.8-1.5mm, and each layer is all from circumferential edge along (1), and finish (2) in the middle of mold cavity, until slightly surpassing the mold cavity original size, then mould is carried out tempering, temperature 400-500 ℃, tempering insulation time is pressed 1 hour/2.5cm of mould maximum ga(u)ge and is determined, naturally reduce to normal temperature after the tempering, fine finishining mould die cavity is to the original size of using again.