Double-liquid compound casting method for automobile mold casting

Abstract

The invention discloses a double-liquid compound casting method for an automobile mold casting. The method specifically comprises the following steps: S1, sand mold manufacturing: 1) drawing: drawinga sand mold pattern matched with a production component according to the pattern and the size of the production component; 2) molding sand proportioning: preparing skin sand and core sand from new sand, old sand, coke particles and clay in proportion; and 3) molding: separately preparing a mold and a sand core from the skin sand and the core sand by means of a molding machine; S2, metal smelting:separately putting a first metal raw material and a second metal raw material in a smelting furnace to be smelted into a molten state; and S3, pouring: injecting a first metal original liquid in the S2 into the mold through a first pouring device, and injecting a second metal original liquid into the mold through a second pouring device at the same time for molding. The method disclosed by the invention is simple to operate and high in practicality, defects such as pores, shrinkage cavities, shrinkage porosities, cold shut and poor surface smoothness can be reduced greatly, and the quality ofthe casting is improved.

Description

technical field [0001] The invention relates to the field of mold casting, in particular to a double-liquid composite casting method for automobile mold castings. Background technique [0002] Automobile mold is the key equipment to complete the forming of auto parts and realize the mass production of automobiles. It plays an important role in the development and remodeling of automobiles. A new model needs about 350-400 sets of automotive panel molds, worth more than 100 million. On average, about 25% of the car panel molds of a modified car need to be replaced, and the value of the replaced molds also reaches tens of millions. Major automobile manufacturers regard improving the cycle of automobile launch as one of the important measures to improve competitiveness, so they put forward higher requirements for the renewal time and quality of automobile panel molds. [0003] The casting of the mold needs to use other easy-to-form materials in advance to make a mold containin...

AI Technical Summary

Problems solved by technology

A reasonable gating system structure plays an important role in ensuring the quality of castings. The gating system is closely related to the flow state of the metal liquid and the discharge of gas in the cavity, and can affect the filling conditions such as filling speed, filling time, and cavity temperature. It plays a regulating role, but unreasonable gating system will lead to defects such as air holes, shrinkage cavities, shrinkage porosity, cold shut and poor surface finish

[0004] In the process of double-liquid composite casting, the two casting liquids cannot be mixed, which will reduce the purity of the high-hardness casting liquid material, thereby reducing the mechanical properties of the workpiece, and can not cause cold separation and oxidation on the joint surface of the two metals. Inclusion defect

However, the traditional double-liquid composite casting method uses a single two pouring devices to superimpose to realize the double-liquid composite casting molding, which is easy to cause the two casting liquids to mix or cold shut, and oxidize inclusion defects, which will affect the quality of the double-liquid composite casting.

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