A pouring method for casting VHP main bearing cap

Abstract

The invention discloses a pouring method for casting a VHP main bearing cover. Molten metal iron is poured into a mold cavity of a bearing cover casting mold through a pouring system; the pouring system comprises a sprue, a cross gate and ingates, wherein an outlet of the sprue is connected with an inlet of a cross gate; two hot spots are symmetrically arranged on the cross gate about the sprue gate serving as a center; each hot spot is connected with two ingates, and the ingates are symmetrically arranged on the hot spot about the sprue serving as a center; the modulus of each hot spot is greater than or equal to 1.5 times the modulus of a single casting; the sectional area ratio of the sprue, the cross gate and the ingates is sigma(F)sprue: sigma(F)cross gate: sigma(F)ingate=1: (2.5-3): (10-15); the length of each ingate is less than 5 mm; and the temperature of the molten metal iron is controlled between 1,340 and 1,360 DEG C. According to the pouring method disclosed by the invention, the qualification rate of the VHP main bearing cover is increased, the consumption of a metal material is obviously reduced, and the economical benefit is considerable.

Description

technical field [0001] The invention relates to a casting method, in particular to a casting method for casting a VHP main bearing cover, and belongs to the technical field of casting. Background technique [0002] In casting technology, pouring refers to the method of injecting molten metal into the mold cavity to complete the casting of metal parts. It is generally completed through the gating system. Therefore, the gating system is the channel for liquid metal to enter the mold cavity. Its functions are: 1. 1. Control the speed of molten metal filling the mold and the time required to fill the mold; 2. Make the molten metal enter the mold smoothly, avoid turbulence and erosion of the mold; 3. Prevent slag and other inclusions from entering Cavity; 4. No gas is involved during pouring, and the principle of sequential solidification should be followed as much as possible when the casting is cooled. The gating system generally includes a sprue, a runner and an inner runner....

AI Technical Summary

Problems solved by technology

In the existing pouring process of bearing caps, risers and chills are often used, which is not only inconvenient to operate, but also because casting defects such as shrinkage cavities and shrinkage are prone to occur in thick ductile iron castings, it is difficult for the cast VHP main bearing cap to achieve The zero-defect requirement of NDT inspection, the scrap rate of slag inclusion defects is high, and the pass rate of castings is low

Images