The relationship between heat treatment process and metal forming sheet metal processing, deep drawing, metal stamping, stamping die and progressive stamping die is reflected in the fact that heat treatment is a key step to enhance the performance of metal materials, which, by adjusting the hardness, plasticity and toughness of the material, provides a suitable material state for the molding processes such as sheet metal processing, deep drawing and stamping, and at the same time ensures that the stamping die and progressive stamping die in the continuous high load operation Maintain stable performance and life, thus ensuring the quality and efficiency of molded products.
16. What is the use of heat treatment in mold and die manufacturing? How is it applied?
Question added: Is it heat treatment after the template is processed, which is the main part?
The role of heat treatment in mold manufacturing: improve the hardness, wear resistance, so as to improve its life; Strength enhancement, deformation reduction, to ensure that the accuracy of the mold and precision stability.
17, mold failure cause analysis?
Most of the failure is caused by fracture, wear and deformation, the main reason is improper heat treatment and poor mold processing. Therefore, a reasonable choice of materials, the correct formulation of heat treatment process, improve the quality of heat treatment, to extend the service life of the mold plays a key role. Mold heat treatment including pre-heat treatment and final heat treatment, heat treatment of the ultimate goal is to make the mold has good surface quality and strength, plasticity and toughness of a reasonable fit.
18, Cr12mov mold steel heat treatment appears after a piece of drop the reason?
(1) you may be in the quenching, more than the temperature is too much, overheating, resulting in coarse grain, decarburization is serious, martensite coarse, fracture coarse crystal, toughness, plasticity low.
(2) The heating temperature is too high, the holding time is too long, resulting in serious decarburization of the surface of the material, the organization of coarse grains, poor bonding, plasticity is significantly reduced.
Suggestions: calibrate the heating equipment; adjust the quenching and tempering temperature and time; do sample heat treatment process test, the necessity of energy testing and analysis.
19, the advantages of salt bath heat treatment?
Advantages: uniform heating deformation is small, less oxidation decarburization, fast heating, can quickly transform the internal organization of the workpiece, insulation performance and heating uniformity performance is good, can be heated solution treatment, applicability of a wide range of nearly non-oxidizing shipping treatment.
Disadvantages: poor working environment, a certain degree of corrosion of the workpiece, relatively short service life, workspace size and power, the power is larger, smaller size. And the waste salt on the environment is somewhat polluted, if the customer has a higher requirement for no oxidation can be considered, the cost of the general situation.
20, test the effect of heat treatment with what method?
Simple check surface hardness. Accurate broken inspection: check the hardened layer depth, heart hardness, quenching metallurgical organization level, tempering metallurgical organization level. Hardened layer depth critical hardness value = quenching hardness minimum value X0.8.
21, mold materials deep cold treatment of the role of what?
Deep cooling treatment is the continuation of the cooling process of the workpiece after quenching, the application of the mold industry is mainly reflected in the cold work die steel and high-speed steel, bearing steel, cold work molds and mold parts have deep cooling technology application cases. Deep cooling will change some of the relevant mechanical properties, the main role of the following points: enhance the hardness and strength of the workpiece to ensure the dimensional accuracy of the workpiece to improve the wear resistance of the workpiece to improve the impact toughness of the workpiece to improve the distribution of internal stresses in the workpiece to improve the fatigue strength, improve the corrosion resistance of the workpiece.
22、Heat treatment after wire cutting cracking is the template problem or heat treatment problem?
(1) Perhaps the problem of heat treatment, because there is no heat-treated steel for wire cutting is very difficult to crack, wire cutting cracks because of stress concentration during cutting. Therefore, heat treatment not only to achieve the hardness required by the heat treatment must also eliminate internal stress. The key to eliminate internal stress is the tempering temperature and tempering time. If the tempering temperature is too low, tempering time and then long internal stress can not be eliminated; if the tempering temperature is too high, although the elimination of stress, but can not meet the requirements; if the tempering temperature is appropriate, but the tempering time is too short, the stress can not be completely eliminated. Therefore, the key to wire cutting cracking after heat treatment is the control of tempering temperature and tempering time.
(2) heat treatment line cutting cracking this situation is more complicated, there are mold quenching tempering after insufficient possibility, there are also mold forging defects in the possibility. If the general carbon steel mold, tempering is not sufficient is the main reason, need to give priority to the high alloy mold, there may be defects in the material itself, such as impurities, carbide segregation, etc., these need to be high-fold metallurgical testing to determine.
23, Cr12MoV heat treatment burst what are the reasons?
(1) whether the cooling medium is cooled too quickly (can not use brine, water, etc.)
(2) before quenching, may not have annealed well, resulting in excessive internal stresses
(3) material metallurgy is not good (non-metallic inclusions, banded tissue, eutectic carbides) (4) quenching, furnace temperature rises too quickly
(5) no timely tempering
24, what is non-heat treatment strengthening?
Surface treatment: such as hard chrome plating, to increase the wear resistance of the parts; shot peening: used to bear the alternating stress under the work of the parts, can greatly improve the fatigue strength; rolling: the use of rolling tools at room temperature on the surface of the parts to apply pressure to the surface, so that the metal surface produces plastic deformation, correction of the metal surface of the micro-geometry, improve surface finish, improve fatigue strength of the parts, as well as abrasion resistance and hardness.