Are the causes of deformation of precision and complex molds often complex?

The causes of the deformation of precision and complex molds are often complex, but as long as we grasp the deformation law and analyze the causes of its occurrence, we can reduce and control the deformation of the mold by using different methods to prevent it. Generally speaking, the following methods can be taken to prevent the heat treatment deformation of delicate and complex molds.

1) Reasonable selection of materials. For precision and complex molds, micro-deformation die steels (such as air-quenched steel) with good materials should be selected, reasonable forging and quenching and tempering heat treatment should be carried out for die steels with serious carbide segregation, and solid solution double refinement heat treatment can be carried out for large and unforgable die steels.

2) The mold structure design should be reasonable, the thickness should not be too different, the shape should be symmetrical, the deformation law should be mastered for the deformation of the large deformation mold, the processing allowance should be reserved, and the combined structure can be used for large, precision and complex molds.

3) Precision and complex molds should be pre-heat treated to eliminate the residual stress generated during machining.

4) Reasonable selection of heating temperature, control of heating speed, for precision and complex molds can take slow heating, preheating and other balanced heating methods to reduce the mold heat treatment deformation.

5) On the premise of ensuring the hardness of the mold, try to use pre-cooling, graded cooling and quenching or warm quenching process.

6) For precision and complex molds, if conditions permit, try to use vacuum heating quenching and cryogenic treatment after quenching.

7) For some precision and complex molds, pre-heat treatment, aging heat treatment, quenching and tempering nitriding heat treatment can be used to control the accuracy of the mold.

8) When repairing defects such as mold sand holes, porosity, and wear, use repair equipment with little heat impact such as cold welding machine to avoid deformation in the repair process.

Mold heat treatment deformation is one of the main defects in the mold treatment process, for some precision and complex molds, often scrapped due to heat treatment deformation, so controlling the deformation of precision and complex molds has always become a key problem in heat treatment production. As we all know, during the heat treatment of the mold, especially in the quenching process, the temperature difference caused by the inconsistency of the heating and cooling rates of each part of the mold section, coupled with the unequal chronosis of the tissue transformation, etc., makes the volume expansion and contraction of each part of the mold section uneven, and the uneven tissue transformation, which is caused"Tissue stress"and thermal stress caused by the temperature difference between the inside and outside of the mold. When its internal stress exceeds the yield limit of the mold, it will cause the deformation of the mold.

This is because of the existence of uneven carbides distributed in a certain direction in the mold steel, the expansion coefficient of carbides is about 30% smaller than the matrix structure of the steel, it prevents the expansion of the mold hole when heating, and prevents the mold hole from shrinking when cooling, so that the mold hole is unevenly deformed, so that the round hole of the mold is elliptical. In the manufacture of precision and complex molds, it is necessary to try to choose the mold steel with small carbide segregation, not to be cheap, and to choose the steel produced by small steel mills with poor materials. The forged die steel should be quenched and tempered to obtain a homogeneous, fine and diffuse sostenite structure of carbide distribution, so as to reduce the deformation of precision and complex molds after heat treatment.

1. Due to the difference in the closing height of the CNC punch, in order to prevent accidents, the mold is in the shortest state when it leaves the factory. 2. First of all, loosen the locking screw of the strike head nut; 3. Rotate the hammer nut to adjust, measure the rough height with a caliper, and then fine-tune; 4. Repeatedly adjust to the appropriate height, and finally tighten the locking screw until the locking nut is tightened.

A common problem with elastomer hybrid molds is mold fouling. Mould fouling is the inherent tendency of mixtures to adhere to the surface of the mould during processing. The degree of fouling generated by the mould becomes a mixture of precipitates and remains a thin mucous membrane on the surface of the mould.

Mould fouling not only leads to reduced production efficiency, but also increases the scrap rate. Production suffers because parts need to be moved more carefully and molds are cleaned in stages, resulting in lost production time. The increase in scrap is caused by in-mold defects caused by part cracking in the mold and mold disposal.

1. Wrong, the side gate can be used for two plates (sprue to the side of the glue), and can also be used to judge the sensitivity of the three plates (the thin water nozzle to the side of the glue).

2.False, stiffness refers to hardness, and HRC or HB is generally used to indicate the hardness of the material.

3.No, the accuracy of the pin positioning depends on the machining accuracy of the holes on both sides, and there is no need to adjust the assembly (this method is used when the accuracy is not reached).

4.Yes, depending on the characteristics of the rubber compound, the outer diameter of the general engineering rubber pipe will be smaller than the diameter of the die (because of the shrinkage of the product), and the other styrofoam will be larger than the diameter of the die.

5.Wrong, the side gate refers to the glue feeding from the side of the product (generally the water port), and there are fine water outlets, large water outlets, hot digging runners, etc.

6.I don't know how to take Yu Chu.

1) On the basis of considering the processing method of the mold parts, the design of the BIMA mold is carried out, so that the mold structure is suitable for the processing method to obtain the expected processing effect.

2) Use high-precision and high-rigidity machining machines.

3) Choose a tool with high wear resistance and suitable for high-precision attitude processing.

4) We need to create a favorable environment centered on temperature control.

5) It is necessary to feedback the creative consciousness and key in the processing process to the design department in a timely manner.

6) Strengthen the education and training of operators.