Using the heat treatment while in the mold spare portions

The heat treatment process will be to make the parts purchase the required hardness, scenario, engineer should strictly control the inner stress to assure the dimensional firmness when machining portions, different materials have various methods of heat procedure. With the recently available development of pattern industry, more and many more types of materials are being used, besides Cr12, 40Cr, Cr12MoV, carbide, structure punching manufacturing which require bigger work intensity plus force demanding, the fresh material alloy powder snow is good various, such as V10, ASP23, such material includes high thermal firmness and good organization of your state

Let’s take an illustration of die components by using material Cr12MoV, if quenching after uncertain machining, there’s huge stress left while in the parts, which easily bring on crack when finely-detailed machining or alternative manufacturing process. so provide draw the poise after quenching get rid of the quenching stress. Quenching temps controlled within 900-1020 ℃, in that case cooled to 200-220 ℃ cooked cooled, then immediately melted 220 ℃ tempering, using these services is called one-time hardening approach, it can purchase a higher strength plus wear resistance, it can improve the performing life of the blanking punch which should currently have higher abrasion. In case the machining parts by using complex shapes and most corners in development, tempering is deficiency of to eliminate worry, we should arrange the worry relief or aging treatment for a variety of times to release the worry.

For V10, APS23 and various alloy parts, it may possibly withstand high-temperature tempering, we will use the 2nd hardening process by using 1050-1080 ℃ quenching, in that case tempering with temps 490-520 ℃ to get multiple times, you may obtain more great impact toughness plus stability, it works for the a stamped mold which frequently failure to chipping. The buying price of powder alloy fabric is higher, nonetheless its performance is definitely good, it will often be widely used when you need it in the metal manufacturing.

The analysis of the mold precision manufacturing

A set of mold is composed of many spare,and the quality of the mold accessories  made a direct impact on the quality of the whole mold , and the final quality of the    parts is guaranteed by the high precision machining.

As for the most of the domestic manufacturing enterprises, the precision machining   usually includes  grinding, EDM and fitter treatment. Meanwhile ,we should control the deformation of parts, internal stress, shape tolerances , dimensional accuracy, and many   other technical parameters, in the real production ,the operation will be more difficulty.

For the mold parts machining, generally known as adaptive processing for different  materials, different shapes and different technical requirements .

According to the different shapes of the parts ,we can divide the parts into  three   categories:they are shafts, sheet metal and shaped parts, their common process includes   heat treatment  - grinding - Electric Discharge - surface treatment-assembly

1:heat treatment

By heat treatment process, the die components can reach the required hardness while controlling the internal stress, ensuring dimensional stability when machining the parts,   Normally ,different materials have different way to do the heat treatment. With the recent development of the mold industry, there’re more types of materials to be used, Beside the material Cr12, 40Cr, Cr12MoV, carbide, but for some work intensity, force demanding convex and concave mold, the choice ,we also use V10, ASP23 for better  thermal stability and good performance .

2 Grinding

There’re three types of grinding,: surface grinder, cylindrical grinding and tooling grinding .We should  strictly control the finishing deformation and cracks when grinding, even for the micro crack ,it will influence the overall mold performance.

3:  Electrical machining

In the modern mold factory,  electrical machining is necessary , especially for the molds of the precision sheet metal stamping parts.All kinds of special-shaped with high      hardness parts can be machined by electrical machining ,it is divided into two kinds of wire EDM and E.D.M.

4: Surface treatment and assembly

The marks and Scar is the place where the stress is concentrated ,also it is the     source of crack propagation, so after processing, we should do the surface hardening to the parts and  dispose of processing problems by grinding ,and do the radius treatment to the   sharp holes and sides . In generally ,there will be about 6-10μm deterioration of the hardened layer when E.D.M, the color is gray,  hardened layer is brittle .so before using ,we need to eliminate the hardened layer by  surface polishing .

During the  grinding, electric machining, some machining will be magnetized ,it is   very easy to suck some small things, so before  assembly ,we should prior to the workpiece for demagnetization and clean the surface with ethyl acetate.In the assembly process,  we should prepare all mold accessories for assembly ,and make lists of assembly,the assembly usually start from the mounted guide pins and bushings, and then loading mode frame and punch and die, and adjust  the gap, especially for groups with punch and die gap then  mold testing, write the detailed report. If any problems,we’re able to check by    reverse thinking method, it is from the process after step forward, from finishing to roughing, check each until you’re able to find the  problem.

The maintenance of metal stamping tools

Today we’d like to introduce some precautions of punches and dies when the maintenance of stamping stamping manufacturing


1:We should pay attention to the original conditions of the molds when disassemble or assemble the punches and dies .It is convenient to load the mold later.

2:If adding the lips or shifting ,we should mark the thickness in the spare parts and make good records.

3:Before replacing the punches ,it is necessary to make sure whether the punching die can be fit perfectly .and check the clearance between insert punch and die block is smooth and uniform.

4: After repairing the punches by grinding,the length of the punch will be shorter,so we need to add the clips to achieve the effective length.

5: If changing the broken punch ,we should find out the reasons and check whether it is caused by clipping in the dies,if yes ,when assemble the punch and die ,whether there’s enough gaps .

6:We should place the die in a flat level when assemble the dies,then knock the surface of the dies by copper rods. Never place the dies in a inclined direction with large strength.There must be chamfer under the bottom of dies,in order to check whether it’s in the same level after assembly.

7: After assemble the punch ,die and other mold accessories,we should check whether all parts are installed wrong or installed backwords ,check the taper is traffic or not,check whether the new replacement parts need to reduce the material .Check he mold part which is need to be locked ,check the screw of the mold plate ,check the part whether is locked from the inside to the outside.