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A Casting Process for Improving the Casting Defects of Gear Gear Housing of Reducer

A technology of casting defects and casting process, applied in the field of casting processing, can solve the problems of general needle tooth shell performance, sand inclusion on the surface of castings, and many casting defects, and achieve the effect of reducing the phenomenon of sand inclusion, adhesion and casting defects.

Active Publication Date: 2020-12-04
ANHUI HANSHAN COUNTY ANHUI PROVINCE IN THE SLOWDOWN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A double eccentric sleeve with 180° misalignment is installed on the input shaft, and two roller bearings called rotating arms are installed on the eccentric sleeve to form an H mechanism. The center holes of the two cycloid wheels are the upper rotating arm bearings of the eccentric sleeve. The raceway, and the cycloid wheel meshes with a set of circularly arranged needle teeth on the pin gear to form an internal meshing reduction mechanism with a tooth difference of one tooth. In order to reduce friction, in the reducer, usually on the needle teeth With pintooth shells, however, the performance of pintooth shells obtained by casting in the prior art is average, and there are many casting defects, especially serious sand inclusions on the surface of castings, resulting in low yield, high defective rate, and high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A casting process for improving the casting defects of the gear housing of the reducer, comprising the following steps:

[0022] (1) According to the structure profile of the gear housing of the reducer, the sand mold is prepared by sintering coated sand, which is made of the following components in parts by weight: raw sand 88, basalt fiber 6, phenolic resin 6, bentonite 12, Water glass 2, potassium tetraborate 1.4, the particle size of the raw sand is 80 mesh, and the weight ratio of the phenolic resin to water glass is 3:1;

[0023] (2) Place the sand mold obtained above in a balance chamber for water balance treatment for 2 hours, the temperature in the balance chamber is 50°C, and the relative air humidity is 20%;

[0024] (3) Brush one layer of modified castor oil on the inner surface of the sand mold after step (2) treatment, then carry out drying treatment in the drying chamber for 20min, the temperature in the drying chamber is 55 ℃, and the preparation method ...

Embodiment 2

[0028] A casting process for improving the casting defects of the gear housing of the reducer, comprising the following steps:

[0029] (1) According to the structure profile of the gear housing of the reducer, the sand mold is prepared by sintering coated sand, which is made of the following components in parts by weight: raw sand 95, basalt fiber 8, phenolic resin 9, bentonite 16, Water glass 3, potassium tetraborate 1.6, the particle size of the raw sand is 80 mesh, and the weight ratio of the phenolic resin to water glass is 3:1;

[0030] (2) Place the sand mold obtained above in a balance chamber for water balance treatment for 2 hours, the temperature in the balance chamber is 50°C, and the relative air humidity is 20%;

[0031] (3) Brush one layer of modified castor oil on the inner surface of the sand mold after step (2) processing, then carry out drying treatment in the drying chamber for 30min, the temperature in the drying chamber is 55°C, and the preparation method...

Embodiment 3

[0035] A casting process for improving the casting defects of the gear housing of the reducer, comprising the following steps:

[0036] (1) According to the structure profile of the gear housing of the reducer, the sand mold is prepared by sintering coated sand, which is made of the following components in parts by weight: raw sand 90, basalt fiber 7, phenolic resin 8, bentonite 14, Water glass 2.5, potassium tetraborate 1.5, the particle size of the raw sand is 80 mesh, and the weight ratio of the phenolic resin to water glass is 3:1;

[0037] (2) Place the sand mold obtained above in a balance chamber for water balance treatment for 2 hours, the temperature in the balance chamber is 50°C, and the relative air humidity is 20%;

[0038] (3) Brush one layer of modified castor oil on the sand mold inner surface after step (2) processing, then carry out drying treatment 25min in drying room, the temperature in drying room is 55 ℃, the preparation method of modified castor oil is ...

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Abstract

The invention discloses a casting process for improving casting defects of a pin gear housing of a speed reducer. The casting process comprises the following steps that (1), a sand mold is prepared bysintering coating sand; (2), moisture balance is carried out in a balance chamber; (3), one layer of modified castor oil is brushed on the inner surface of the sand mold; (4), pouring is carried out,after pouring is completed, the sand mold is placed in an ultrasonic field, and then a blank is obtained after cooling and forming; and (5), after inspection is qualified, packaging and warehousing are carried out. According to the casting process for improving the casting defects of the pin gear housing of the speed reducer, the surface quality of the pin gear housing casting of the speed reducer can be greatly improved, and the casting defects are reduced.

Description

technical field [0001] The invention belongs to the technical field of casting processing, and in particular relates to a casting process for improving the casting defect of a gear case of a speed reducer. Background technique [0002] The reducer plays the role of matching speed and transmitting torque between the prime mover and the working machine or the actuator. The reducer is a relatively precise machine. The purpose of using it is to reduce the speed. It can be divided into single-stage according to the number of transmission stages. And the shape of the multi-stage reducer factory wheel can be divided into cylindrical gear reducer, bevel gear reducer and conical-cylindrical gear pulley reducer; according to the layout of the transmission, it can be divided into expansion type, shunt type and coaxial type reducer machine. The reducer is an independent component composed of gear transmission, worm transmission, and gear-worm transmission enclosed in a rigid shell. It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C9/12B22C3/00B22C9/22B22C1/02B22C1/16
CPCB22C1/02B22C1/167B22C3/00B22C9/02B22C9/12B22C9/22
Inventor 吕才友
Owner ANHUI HANSHAN COUNTY ANHUI PROVINCE IN THE SLOWDOWN MACHINERY
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