Production method for surface strengthening layer of threaded element and threaded element for parallel twin-screw extruder

A technology of twin-screw extruder and surface strengthening layer, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of insufficient wear resistance of coating, low bonding strength of substrate, separation of wear layer, etc. Extended life, high production efficiency, and reduced effect of subsequent processing

Inactive Publication Date: 2018-09-28
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many ways to strengthen the surface of threaded components, but there are various defects: such as hot dipping and carburizing, the range of material selection is relatively narrow, and the wear resistance of the prepared coating is not enough

Method used

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  • Production method for surface strengthening layer of threaded element and threaded element for parallel twin-screw extruder
  • Production method for surface strengthening layer of threaded element and threaded element for parallel twin-screw extruder
  • Production method for surface strengthening layer of threaded element and threaded element for parallel twin-screw extruder

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preparation example Construction

[0017] An embodiment of the present invention provides a method for preparing a surface strengthening layer of a threaded element. For reference, the preparation method may include the following steps: mixing tungsten carbide powder, nickel-based self-fluxing alloy powder and binder, banburying, to obtain Feeding: put the substrate (threaded element) of the surface reinforcement layer to be prepared into the mold and reserve a filling space for the feeding; inject the feeding into the filling space, then dewax and sinter.

[0018] Specifically, the mixing process of tungsten carbide powder, nickel-based self-fluxing alloy powder and binder can be carried out step by step, first mix tungsten carbide powder and nickel-based self-fluxing alloy powder to obtain metal mixed powder, and then mix with binder . The above mixing process can be carried out in the internal mixer, that is, the metal mixed powder is added to the internal mixer for preheating, so that the metal mixed powder...

Embodiment 1

[0034] The metal mixed powder mixed with tungsten carbide powder and Ni60A powder at a mass ratio of 5:95 was added to an internal mixer for preheating, and when the temperature reached 140°C, a binder was added to continue banburying for 180 minutes to obtain a feed.

[0035] Among them, the mass ratio of metal mixed powder and binder is 90:10. The binder contains 25 parts by weight of paraffin wax, 15 parts by weight of palm wax, 5 parts by weight of high-density polyethylene, 5 parts by weight of polypropylene, 1 part by weight of ethylene-vinyl acetate copolymer and 1 part by weight of stearin acid.

[0036] Clean the surface of the base body of the threaded element, put the base body into the mold and reserve a filling space for feeding. Put the feed material into the injection molding machine, and perform injection molding under the conditions of injection temperature of 140°C, injection pressure of 50MPa, and mold temperature of 30°C to obtain a 1mm thick surface stren...

Embodiment 2

[0040] The metal mixed powder mixed with tungsten carbide powder and Ni45 powder at a mass ratio of 30:70 was added to the internal mixer for preheating, and when the temperature reached 165°C, the binder was added and the internal mixing was continued for 90 minutes to obtain the feed.

[0041] Among them, the mass ratio of metal mixed powder to binder is 95:5. The binder contains 40 parts by weight of paraffin wax, 25 parts by weight of carnauba wax, 20 parts by weight of high-density polyethylene, 20 parts by weight of polypropylene, 5 parts by weight of ethylene-vinyl acetate copolymer and 5 parts by weight of stearin acid.

[0042] Clean the surface of the base body of the threaded element, put the base body into the mold and reserve a filling space for feeding. Put the feed material into the injection molding machine, carry out injection molding under the conditions of injection temperature of 190°C, injection pressure of 140MPa, and mold temperature of 80°C to obtain a...

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Abstract

The invention relates to a production method for a surface strengthening layer of a threaded element and the threaded element for a parallel twin-screw extruder and belongs to the technical field of screw extruders. The production method comprises the steps that tungsten carbide powder, nickel-based self-fluxing alloy powder and a binder are mixed and internally mixed, and feed is obtained; a substrate of the surface strengthening layer to be produced is arranged into a mold, and a filling space is reserved for the feed; and the feed is injected into the filling space and then dewaxed and sintered. The method is relatively simple, the production efficiency is high, the near-net forming can be realized, the subsequent processing is reduced, and the method is especially suitable for large-scale mass production. The surface of the threaded element for the parallel twin-screw extruder has the surface strengthening layer with the high metallurgical bonding strength and the excellent wear resistance, the metallurgical bonding of the surface strengthening layer and the substrate is good, the surface strengthening layer has the obvious transition zone, and the structure distribution is uniform. In addition, the surface strengthening layer is nearly fully compact, has high hardness larger than or equal to 64.5 HRC, has excellent corrosion resistance and wear resistance and has the service life more than 2 times longer than that of the prior art.

Description

technical field [0001] The invention relates to the technical field of screw extruders, and in particular to a method for preparing a surface reinforcement layer of a threaded element and a threaded element for a parallel twin-screw extruder. Background technique [0002] Screw elements are the key components of parallel twin-screw extruders. The plastic raw material is transported, compacted, melted, stirred through the screw element, and finally flows out from the extrusion port with a certain pressure and flow. In recent years, with the rapid development of the plastic raw material industry, various reinforced and modified engineering plastic raw materials have been continuously introduced, and the traditional threaded components have been unable to meet the needs of processing these reinforced and modified raw materials. The main reason is the corrosion resistance of the surface of the threaded components and the The high-temperature bonding wear performance is low, the...

Claims

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Application Information

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IPC IPC(8): B22F7/08B22F1/00B22F3/22B22F3/10B29C47/60
CPCB22F3/1007B22F3/225B22F7/08B29C48/505B22F2998/10B22F1/103B22F1/108
Inventor 罗浩翁廷曾克里宗伟李志周晚珠宋信强朱杰宋仁金潘超梅李响
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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