Hub sand core and low-pressure casting hub die

Abstract

The invention provides a hub sand core and a low-pressure casting hub die. The hub sand core comprises a sand core body (1), a tapered protrusion (11) is arranged at one end of the sand core body (1), a blind hole (12) is reserved at the other end of the sand core body (1), and an annular boss (13) is arranged at one end, with the blind hole (12), of the sand core body (1). In the technical scheme of the hub sand core, the sand core body is no longer of a through hole structure, the top of the sand core body is designed into the shape of the top of a distributing cone, an original distributing cone top is replaced by a shaped conical protrusion of the sand core to realize distribution of molten aluminum; the distributing cone no longer directly contacts with the molten aluminum, even if small amount of molten aluminum permeating through a matching surface of the distributing cone and the sand core body can flow to the bottom of a conical hole of the sand core body, so that a venting plug is prevented from being blocked, producing efficiency is improved, and die preparation cost is lowered.

Description

technical field [0001] The invention relates to the field of moulds, and more specifically, to a wheel hub sand core and a low-pressure casting wheel hub mold. Background technique [0002] Existing automobile hub and motorcycle hub casting include gravity casting and low-pressure casting, and in the related art, a kind of low-pressure casting hub mold such as Figure 1 to Figure 4 As shown, it includes upper mold 4, side mold 5, lower mold 6, sand core body 1, splitter cone 2 and exhaust plug 3. High-temperature aluminum liquid enters the mold cavity through the low-pressure sprue indicated by arrow a. There is a through hole 14 in the center of the sand core, the splitter cone 2 is perforated with the sand core body 1, and the top of the splitter cone 2 plays the role of splitting the aluminum liquid. The splitter cone 2 is opened and installed with 12 6mm exhaust plugs 3 to exhaust. [0003] During the production process, the top of the splitter cone 2 is easily corroded ...

AI Technical Summary

Problems solved by technology

[0003] During the production process, the top of the splitter cone 2 is easily corroded due to multiple times of high-temperature molten aluminum, which affects the service life of the splitter cone; the splitter cone 2 and the through hole 14 are clearance fit, and the high-temperature aluminum liquid easily enters the drain of the sand core body. Gas surface (the matching surface between the splitter cone and the sand core body); after the high-temperature aluminum liquid enters the exhaust surface of the sand core body, it will immediately enter the mesh exhaust plug, so that the exhaust hole cannot be effectively exhausted

[0004] In addition, the hub sand core used for low-pressure casting will cause the aluminum hydraulic pressure to enter the surface of the sand core body due to the pressure in the low-pressure casting furnace, so that the aluminum liquid and the sand core particles will bond, and the surface of the obtained casting is not smooth, which is not conducive to the heat dissipation of the hub. Affect driving safety and fail to meet safety requirements

[0005] Due to the problem of cooperation between the splitter cone 2 and the sand core body 1, the accuracy of the sand core body 1, and the aluminum sticking of the splitter cone 2, etc., the exhaust plug 3 is blocked, which leads to the dismounting of the mold, and the mold preparation can only produce 1-2 shifts at a time ( One shift is about 8 hours), and at the same time, the sand core body will be pressed down, resulting in the product being scrapped due to insufficient wall thickness. For example, the product cannot be mass-produced due to the sand core body being pressed down. Bring a lot of waste, urgently need a more scientific and effective method to solve this technical problem

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