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Metallic screw and manufacturing method for same

A screw and metal technology, applied in the field of multi-component boride-based superhard bimetallic screw and its preparation, achieves the effects of convenient mass production, high bonding strength and simple production process

Active Publication Date: 2012-11-14
浙江华业塑料机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first technical problem to be solved by the present invention is to provide a metal screw with good wear resistance and corrosion resistance and long service life in view of the above-mentioned current state of the art.

Method used

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  • Metallic screw and manufacturing method for same
  • Metallic screw and manufacturing method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0045] In this embodiment, 40Cr steel is used as a mandrel, and a layer of Mo is coated on the surface of the mandrel by hot isostatic pressing sintering. 2 FeB 2 - Fe-based cermet layer, and then the screw rod is made by finishing. The raw material powders used in the preparation of cermets are pure Mo powder (5-10 μm), pure Cr powder (5-10 μm), pure Ni powder (5-10 μm), pure Fe powder (10-15 μm) and FeB powder (20-10 μm). 30 μm), the mixing ratio is 35% FeB, 45% Mo, 3% Ni, 2% Cr, 15% Fe. The concrete preparation method of this bimetallic screw rod is as follows:

[0046] 1. Put the mandrel into a special sheath, and fill the gap between the mandrel and the sheath with the mixed raw material powder;

[0047] 2. Put the package as a whole into the sealed container of the hot isostatic pressing equipment and vacuumize;

[0048] 3. The cermet green body is prepared by hot isostatic pressing sintering method, and argon is used as the pressurized medium. The process parameters...

Embodiment B

[0055] The preparation of the metal screw in this example is basically the same as in Example A, the difference is that the mixing ratio of the raw material powder is changed to: 30% FeB, 50% Mo, 3% Ni, 2% Cr, 15% Fe, other experiments Same conditions. The microhardness test was carried out on the cermet of the bimetallic screw prepared above, and the average hardness was 1137.5Hv (HRC73).

Embodiment C

[0057] The preparation of the metal screw in this example is basically the same as in Example A, the difference is that the mixing ratio of the raw material powder is changed to: 30% FeB, 45% Mo, 3% Ni, 2% Cr, 20% Fe, other experiments Same conditions. The microhardness test was carried out on the cermet of the bimetallic screw prepared above, and the average hardness was 1110.1Hv (HRC72.4).

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Abstract

The invention discloses a metallic screw and a manufacturing method for the same. A chrome and molybdenum-containing alloy steel bar is taken as a screw mandrel (1) of the screw. A multi-element boride-based metal ceramic layer (2) is coated on the periphery of the screw mandrel (1) in a sintering way, and is a Mo2FeB2-Fe-based metal ceramic layer, a Mo2NiB2-Ni-based metal ceramic layer or a WCoB-Co-based metal ceramic layer. The manufacturing method comprises the following steps of: placing the screw mandrel into a sheath, and filling proportioned powdery raw materials into a gap between the screw mandrel and the sheath; placing the whole sheath into a closed container, and vacuumizing the closed container; and sintering the sheath in the closed container, and finely machining the multi-element boride-based metal ceramic layer to obtain the metallic screw. The multi-element boride-based superhard bimetallic or metallic screw has the advantages of low comprehensive cost, simple manufacturing process, long service life, suitability for industrialization, and the like, and can be used for replacing the conventional widely-used screws subjected to nitriding, spray welding, casting and the like.

Description

technical field [0001] The invention relates to the technical field of screw manufacturing, in particular to a multi-component boride-based superhard bimetallic screw and a preparation method thereof. Background technique [0002] The screw is the core component of plastic molding equipment, and it is the part that is heated, extruded and plasticized. The screw is damaged due to friction and wear. With the rapid development of the chemical industry, various new plastic raw materials are emerging. In high-strength reinforced plastic raw materials, such as carbon, asbestos, glass, boron and other reinforcing fibers are often contained. In addition, in order to obtain various special properties or reduce costs, a certain proportion of various fillers, such as chalk, silica, barite, clay, cellulose, mica, talc and metal powder, are often added to plastic resins. Due to the addition of these reinforcing agents, fillers and inorganic colorants, the wear and corrosion of the barr...

Claims

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Application Information

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IPC IPC(8): B29C47/60B22F7/08C22C29/14B29C48/535B29C48/395
CPCB29C47/38B29C47/0844B29C47/6025B29C48/507B29C48/395B29C48/535
Inventor 夏增富
Owner 浙江华业塑料机械股份有限公司
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