Casting method for brake booster vacuum pump shell

A technology for booster vacuum pumps and shells, which is applied in the casting field of brake booster vacuum pump shells, can solve problems such as poor corrosion resistance, unreasonable pressure control, and air entrapment, and achieve improved mechanical properties of castings, reduced microstructure looseness, strong Effect of heat feeding capacity

Inactive Publication Date: 2016-01-06
高文梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the existing automobile brake booster vacuum pump shells are made of aluminum alloy die castings by casting method. Due to the complex structure and uneven wall thickness of the brake booster vacuum pump shell castings, when the molten metal is injected into the cavity of the mold during the pouring process There will be air entanglement and insufficient casting of molten metal. Therefore, the aluminum alloy die-casting parts of the automobile brake booster vacuum pump shell are often prone to defects such as pores, shrinkage cavities, and leakage. The defective rate is high, raw materials and energy are seriously wasted, and production costs are high. , low production efficiency, poor wear resistance, corrosion resistance, and high thermal expansion coefficient
The existing casting method is complex and the product quality is not easy to control, and the pressure control is unreasonable. If the car uses a defective car brake booster vacuum pump housing, it is easy to cause a safety accident, and the consequences are unimaginable.

Method used

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  • Casting method for brake booster vacuum pump shell
  • Casting method for brake booster vacuum pump shell
  • Casting method for brake booster vacuum pump shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A casting method for a brake booster vacuum pump casing, which is carried out according to the following steps:

[0018] Step 1: (1) Drying: First remove the residual coating and oxide layer of the melting tool, clean the melting tool first, spray a layer of protective coating evenly on the surface after preheating at 350°C, and then keep it at 400°C for more than 0.5 hours to dry until it turns yellow;

[0019] (2) Preheating and dehumidification: industrial additives need to be fully dehydrated and dried. The smelting equipment should be preheated before use to reduce moisture and other substances that increase the gas content of the melt. The preheating and dehumidification treatment is to put industrial additives in 100°C for 30 minutes;

[0020] Step 2: Smelting: According to the given weight ratio of ingredients, add 70-75% of pure aluminum and 10-20% of solid silicon into the induction melting furnace at the same time, raise the temperature to 1550-1600 degrees,...

Embodiment 2

[0024] A casting method for a brake booster vacuum pump casing, which is carried out according to the following steps:

[0025] Step 1: (1) Drying: First remove the residual coating and oxide layer of the melting tool, clean the melting tool first, spray a layer of protective coating evenly on the surface after preheating at 400°C, and then keep it at 600°C for more than 0.5 hours to dry until it turns yellow;

[0026] (2) Preheating and dehumidification: industrial additives need to be fully dehydrated and dried. The smelting equipment should be preheated before use to reduce moisture and other substances that increase the gas content of the melt. The preheating and dehumidification treatment is to put industrial additives in 150°C for 30 minutes;

[0027] Step 2: Smelting: According to the given weight ratio of ingredients, add 70-75% of pure aluminum and 10-20% of solid silicon into the induction melting furnace at the same time, raise the temperature to 1550-1600 degrees,...

Embodiment 3

[0031] A casting method for a brake booster vacuum pump casing, which is carried out according to the following steps:

[0032]Step 1: (1) Drying: First remove the residual coating and oxide layer of the melting tool, clean the melting tool first, spray a layer of protective coating evenly on the surface after preheating at 375°C, and then keep it at 500°C for more than 0.5 hours to dry until it turns yellow;

[0033] (2) Preheating and dehumidification: industrial additives need to be fully dehydrated and dried. The smelting equipment should be preheated before use to reduce moisture and other substances that increase the gas content of the melt. The preheating and dehumidification treatment is to put industrial additives in 130°C for 25 minutes;

[0034] Step 2: Smelting: According to the given weight ratio of ingredients, add 70-75% of pure aluminum and 10-20% of solid silicon into the induction melting furnace at the same time, raise the temperature to 1550-1600 degrees, ...

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Abstract

The invention provides a casting method for a brake booster vacuum pump shell. According to the method, a degassing method is adopted during the smelting process to reduce the chance of air involvement, and the problems of air involvement, insufficient casting of molten metal and the like occurring when the molten metal is injected into a casting mold cavity during the casting process are avoided; the defects of air holes, shrinkage cavities, leakage and the like which frequently occur to an aluminum alloy casting of the brake booster vacuum pump shell are reduced. Moreover, the unequal-pressure casting method is adopted, and the casting technology has high thermal feeding capacity, so that molten metal is solidified and crystallized under the effect of the difference between upper pressure and lower pressure, the microstructure porosity of the brake booster vacuum pump shell is remarkably lowered, the structure is more compact, and the mechanical property of the brake booster vacuum pump shell is remarkably improved.

Description

technical field [0001] The invention relates to a casting method of a brake booster vacuum pump shell. Background technique [0002] Most of the existing automobile brake booster vacuum pump shells are made of aluminum alloy die castings by casting method. Due to the complex structure and uneven wall thickness of the brake booster vacuum pump shell castings, when the molten metal is injected into the cavity of the mold during the pouring process There will be air entanglement and insufficient casting of molten metal. Therefore, the aluminum alloy die-casting parts of the automobile brake booster vacuum pump shell are often prone to defects such as pores, shrinkage cavities, and leakage. The defective rate is high, raw materials and energy are seriously wasted, and production costs are high. , low production efficiency, poor wear resistance and corrosion resistance, and high thermal expansion coefficient. The existing casting method is complex and the product quality is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
Inventor 高文梅
Owner 高文梅
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