Surface thermal treatment method of screw

A technology of surface heat treatment and screw, which is applied in the field of enhanced heat treatment of screw surface and surface heat treatment of screw, which can solve problems such as economic loss of screw, improve wear resistance and fatigue resistance, reduce surface defects and wear, and improve surface hardness Effect

Inactive Publication Date: 2013-09-04
FOSHAN HUAYAN LIHE SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, screw failure will lead to huge economic losses

Method used

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Embodiment Construction

[0023] Below in conjunction with embodiment screw rod surface treatment method of the present invention is described in further detail, following listed embodiment is the non-limitative embodiment of the present invention, relevant screw rod material composition distribution ratio and the present invention process parameter can be adjusted in the allowable range, Such adjustments have no substantial effect on the invention.

[0024] The screw surface treatment method of the present embodiment is carried out in the following steps:

[0025] 1) The screw is degreased, acid activated and deionized water washed in sequence

[0026] The screw is immersed in alkaline solution, dilute sulfuric acid aqueous solution and deionized water in sequence for treatment;

[0027] 2) Dry the screw to remove the residual water on the surface

[0028] Put the wet screw into the dryer, keep the temperature at 50-100°C for 3-5 minutes;

[0029] 3) Perform gas nitriding sulfur chromium treatment ...

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Abstract

The invention relates to a surface thermal treatment method of a screw. The surface thermal treatment method comprises the following steps of: (1), carrying out degreasing, acid activating and deionized water-washing treatment onto a screw workpiece in sequence; (2), drying the screw pretreated in the step (2), and removing the residual water on the surface; (3), carrying out gas nitrogen-sulfur-chrome leakage treatment on the screw, placing the workpiece to an electric heating furnace with a gas mixture of gas complex of sulfur chrome and nitrogen gas to carry out nitrogen-sulfur-chrome leakage treatment; (4), carrying out sand blasting or shot blasting treatment on the screw workpiece, and removing a surface loose layer; (5), carrying out oxidation treatment on the screw workpiece, placing the workpiece to the electric heating furnace with liquid oxide salt, and immersing to oxide salt molten liquid; and (6), repeating the steps (3)-(5) by once or twice or more, forming a super-hard surface tissue on the surface of the wokpiece to complete the surface treatment of the screw workpiece. According to the surface thermal treatment method of the screw, a layer of nitrogen-sulfur-chrome-iron compound with a thickness of 15 microns-45 microns is formed on the surface of the screw, so that the surface hardness, the abrasion resistance and the corrosion resistance of the screw are improved.

Description

technical field [0001] The invention relates to a screw surface heat treatment method, which is suitable for the enhanced heat treatment of the screw surface of an injection molding machine. The invention belongs to the technical field of metal surface heat treatment. Background technique [0002] The screw is a key part of the injection molding machine. The working environment of the screw is harsh, and the working temperature is usually above 200°C. During the production of plastic products, the screw and the plastic particles are rubbed and extruded, and at the same time, they are also subjected to the abrasion of the molten material and the stress during pre-molding. Frequent load starts. In recent years, with the improvement of the performance and variety of plastic products, the working environment of the screw has become more severe. In addition to the increased wear caused by the use of high-hardness fillers, there are also different degrees of corrosion. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02C23C8/42
Inventor 刘卫林王超杨曦宇郭沫清黄拯
Owner FOSHAN HUAYAN LIHE SURFACE TECH
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