Manufacturing method of large module for mold

Abstract

The invention discloses a method for manufacturing a large-scale module for a mold. The method uses a steel ingot as a raw material, and includes the following steps: heating, forging, and heat treatment; wherein, the forging step includes the following sub-steps in turn: the first upsetting, the first return to the furnace for heat preservation, the second upsetting, and the second return. Furnace heat preservation, forging into a material; the first upsetting and drawing sub-process includes: the first upsetting treatment, the first drawing treatment, and taking the steel ingot axis as the axis to flatten the first drawing treatment. After the blank is turned 90 degrees, the second elongation treatment is carried out. This application adopts the "flat square" forging process, which only needs 2 upsetting and 2 pulling to complete the forging molding, and the flaw detection meets SEP1921‑D / d, and the more stringent SEP1921‑E / e requirements can also be met by using the optimal process. The production cost The reduction is about 500 yuan / ton, which not only ensures the qualified flaw detection, but also shortens the production time and energy consumption.

Description

technical field [0001] The invention relates to a method for manufacturing a large-scale module for a mold, and belongs to the field of thermal processing of materials. Background technique [0002] With the rapid development of the domestic automobile and home appliance industries, the market demand for die steel is also increasing. Many die steel manufacturers are developing and producing die steel in order to seize market share. In recent years, the module size demanded by the mold steel market has also gradually increased. The thickness of the module is 700-800mm, the width is 1200-1300mm, and the length is greater than 2300-2400mm. The weight of a finished module is about 22 tons. They are gradually being tightened, posing more challenges to mold steel manufacturers. How to produce large-scale, high-quality mold steel modules under the constraints of existing equipment and production costs has become the focus of manufacturers. [0003] There are following defects and ...

AI Technical Summary

Problems solved by technology

[0004] 1) For large modules (thickness 700-800 mm, width 1200-1300 mm, length greater than 2300-2400 mm, finished product unit weight about 22 tons), flaw detection must meet the requirements of SEP1921-E / e, if 30 tons of steel ingots are used for production, When forging on the 45MN fast forging machine, due to the insufficient pressure of the 45MN fast forging machine, the 900mm wide anvil cannot be used for forging, and only the 700mm wide anvil can be used for forging. If the flaw detection is qualified, the process is complicated and the cost is high; if the conventional 2 upsetting and 2 pulling methods are used to make it reach the required size, it will face problems such as difficult forging and low yield, and the flaw detection cannot meet the requirements of SEP1921-E / e

[0005] 2) For such a large module, the technical requirement is that the hardness of the module is 190-240HBW. Other manufacturers use quenching + tempering to meet the hardness requirement. The risk of quenching cracking is as high as 20%, and the core of the module cannot be hardened, and the hardness of the surface and the core is not uniform.

Images