Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF4 Cites 24 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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).
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Diameter
aaaaa
aaaaa
Average hardness
aaaaa
aaaaa
Average hardness
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more