Exhaust unit and method for low-pressure casting with metal mold

A technology of exhaust device and low pressure casting, which is applied in the field of metal mold low pressure casting exhaust device and exhaust, metal mold precision low pressure casting, can solve the problems of difficult fixing of copper screen, low work efficiency, waste, etc., to achieve the overall effect Good, cost-saving, high-quality results

Active Publication Date: 2015-09-09
HIMILE MECHANICAL SCI & TECH (SHANDONG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copper screen is not easy to fix. Because the liquid aluminum will be embedded during casting, the copper screen will remain on the casting after each casting and cannot be removed for reuse. A new copper screen must be replaced before each casting , not only cumbersome, but also wasteful
[0006] The Chinese patent with the application number 201310220519.6 discloses a metal type low-pressure casting mold, which includes a bottom plate, left and right molds, sand cores, keels, bolts and an upper mold. The inside is a Huff structure, and there are vent holes at the connection. The upper mold is set on

Method used

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  • Exhaust unit and method for low-pressure casting with metal mold
  • Exhaust unit and method for low-pressure casting with metal mold
  • Exhaust unit and method for low-pressure casting with metal mold

Examples

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Effect test

Embodiment 1

[0036] Example 1, such as figure 1 with figure 2 As shown, a metal type low-pressure casting exhaust device, the exhaust device 1 includes an exhaust device body 11, the exhaust device body 11 is cylindrical, and the center of the exhaust device body 11 is provided with a cavity 111 along the axial direction. The cross section of the cavity 111 is circular, one end of the cavity 111 is open, the other end of the cavity 111 and the end surface on the same side of the exhaust device body 11 are provided with an exhaust device bottom plate 112, and a fixing frame 13 is provided in the cavity 111. A high-temperature-resistant liquid-proof and breathable layer 15 is provided between the fixing frame 13 and the bottom plate 112 of the exhaust device. The high-temperature-resistant liquid-proof and breathable layer 15 is used to realize the overflow of gas generated during the casting process, and at the same time, it can prevent the alloy liquid from seeping out. 13 is used to fix an...

Embodiment 2

[0047] Example 2, such as Figure 8 with Picture 9 As shown, a metal-type low-pressure casting exhaust device includes an exhaust hole 14. The exhaust hole 14 is tapered. The big end of the exhaust hole 14 is located at the bottom to facilitate demolding. The rest of the structure is the same as in embodiment 1. This embodiment I won't repeat it in the example.

[0048] When the exhaust device in this embodiment is applied to the metal mold low-pressure casting process, the exhaust effect is good, the quality of the obtained workpiece is high, and the phenomenon of pores in the workpiece is effectively avoided, but the upper end of the mold release point is prone to thin-shaped sharp surfaces Although it does not affect the quality of the workpiece, it is easy to scratch the operator sometimes.

Embodiment 3

[0049] Example 3, such as Picture 10 As shown, a metal-type low-pressure casting exhaust device includes an exhaust hole 14, which is a straight hole, and the rest of the structure is the same as in Embodiment 1, and will not be repeated in this embodiment.

[0050] When the exhaust device in this embodiment is applied to the low-pressure metal casting process, the exhaust effect is good, the quality of the obtained workpiece is high, and the phenomenon of pores in the workpiece is effectively avoided, but it is difficult to demold. The exhaust hole 14 The solidified aluminum column is easy to block the vent hole and needs to be removed and cleaned.

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Abstract

The invention relates to an exhaust unit and method for low-pressure casting with a metal mold. The exhaust unit comprises a body; the body is internally provided with a cavity used for exhausting; a high temperature resistant liquid-isolating breathable layer made of ceramic fiber is arranged within the cavity; a fixture is arranged above the high temperature resistant liquid-isolating breathable layer; an exhaust vent is provided below the high temperature resistant liquid-isolating breathable layer and comprises a conical hole and a conical-holed protrusion communicated with each other; the small end of the conical hole is communicated with the conical-holed protrusion which is tubular in shape; the conical-holed protrusion is provided on one side close to the high temperature resistant liquid-isolating breathable layer. The exhaust unit has the advantages that demolding is easy, exhausting is effective, exhausting condition of a casting product and changes in gas-forming amount of casting material are conveniently directly detected, and the exhaust unit is economical and applicable, simple to operate, environment friendly and pollution free. The exhaust method has the advantages the process is simple, the efficiency is high, a workpiece is effectively avoided being voided or material short, and the product yield is up to more than 99.9%.

Description

Technical field [0001] The invention relates to an exhaust device and an exhaust method, which is suitable for casting technology, particularly suitable for metal mold precision low-pressure casting. Specifically, it relates to a metal mold low-pressure casting exhaust device and an exhaust method, belonging to the technical field of casting . Background technique [0002] Metal mold low pressure casting technology has been widely used in my country, especially in the cast aluminum industry. [0003] In the casting process, the exhaust in the casting cavity is one of the key links. A poor exhaust system will hold the cavity in the cavity. In severe cases, it will also generate back pressure, resulting in the molten metal not being able to completely fill the cavity, resulting in casting defects or scrap. [0004] There are a variety of exhaust methods in the industry, which can be roughly divided into: groove type, slot type and mesh type. However, the above-mentioned methods are e...

Claims

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Application Information

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IPC IPC(8): B22D18/04
Inventor 张仁宝
Owner HIMILE MECHANICAL SCI & TECH (SHANDONG) CO LTD
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