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Screw with composite coating and preparing method of screw

A composite coating, alloy coating technology, applied in the coating, superimposed layer plating, metal material coating process and other directions, can solve the problem of increasing the product defect rate, screw black spots, easy to fall off the chromium layer, etc. Excellent wear resistance, improved wear and corrosion resistance, and good corrosion resistance

Inactive Publication Date: 2018-05-11
NAXAU NEW MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the chromium layer is easy to fall off during the use of the screw, causing black spots on the screw and increasing the defective rate of the product

Method used

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  • Screw with composite coating and preparing method of screw
  • Screw with composite coating and preparing method of screw
  • Screw with composite coating and preparing method of screw

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] figure 1 The shown preparation method of the screw 100 with a composite coating according to an embodiment of the present invention includes the following steps:

[0024] Provide bars, for example, round bars;

[0025] Forming a metal hard ceramic alloy coating 18 on the surface of the bar;

[0026] For example, but not limited to grinding and polishing, the rod material formed with the metal hard ceramic alloy coating 18 is processed into a helical screw 100, wherein only the surface of the flight 12 of the screw rod 100 retains the hard metal ceramic alloy coating 18; and

[0027] A physical vapor deposition PVD coating 16 is deposited on the entire screw 100 using a physical vapor deposition PVD process.

[0028] In an embodiment of the present invention, forming the metal hard ceramic alloy coating 18 on the surface of the rod includes (for example, but not limited to) a supersonic flame spraying process to form the metal hard ceramic coating on the surface of th...

Embodiment 1

[0037] Available in bar stock, eg round bar.

[0038]Heat treat the bar. Then, a NiCr-Cr3C2 alloy is sprayed on the surface of the rod by a supersonic flame spraying process to form a metal hard ceramic coating 18 with a thickness of about 0.3 mm, wherein the weight ratios of Cr3C2 and NiCr are 75% and 25%. Then, grind and polish the bar material that is sprayed with metal hard ceramic coating 18, the bar material is processed into such as figure 1 A helical screw 100 is shown.

[0039] Then, argon gas with a purity of 99.999% (that is, high-purity argon gas) is introduced, and the surface of the screw 100 is cleaned under the condition of a bias voltage of 800-1000V. Stop feeding argon, feed nitrogen with a purity of 99.999% (that is, high-purity nitrogen), open the CrAl target under the condition of a bias voltage of 80-100V, and use an arc current of 120A-200A. CrAlN alloy is deposited on the surface of the screw 100 to form a PVD coating 16 with a thickness of about 8 μ...

Embodiment 2

[0041] Available in bar stock, for example, round bar.

[0042] Heat treat the bar. Then, WC-12Co alloy was sprayed on the surface of the rod by supersonic flame spraying technology to form a metal hard ceramic coating 18 with a thickness of about 0.3mm, wherein the weight ratios of WC and Co were 88% and 12%. Then, grind and polish the bar material that is sprayed with metal hard ceramic coating 18, the bar material is processed into such as figure 1 A helical screw 100 is shown.

[0043] Then, argon gas with a purity of 99.999% (that is, high-purity argon gas) is introduced, and the surface of the screw 100 is cleaned under the condition of a bias voltage of 800-1000V. Stop feeding argon, feed nitrogen with a purity of 99.999% (i.e. high-purity nitrogen), open the Cr target under the condition of bias voltage 80-100V, arc current 120A to 200A, use PVD process to clean the CrN alloy is deposited on the surface of the screw 100 to form a PVD coating 16 with a thickness of a...

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Abstract

The invention relates to a screw with a composite coating and a preparing method of the screw. According to the embodiment, the screw with the composite coating comprises a thread section, the threadsection comprises a plurality of screw edges and a plurality of screw channels arranged between the multiple screw edges, PVD coatings are attached to the surfaces of the screw channels, and metal hard ceramic coatings and the PVD coatings are sequentially attached to the surfaces of the screw edges from inside to outside. According to the screw with the composite coating and the preparing methodof the screw in the embodiment, the metal hard ceramic coatings and the PVD coatings are sequentially attached to the screw edge surfaces which are prone to being abraded and corroded, and therefore the abrasion resistance and corrosion resistance of the screw edge positions are obviously improved; the PVD coatings are attached to the surfaces of the screw channels, and the metal hard ceramic coatings are not attached to the surfaces of the screw channels, so that liquidity of plastic in the rotating period is increased. By means of the screw and the preparing method, abrasion and corrosion ofthe screw in the using process can be effectively prevented, and the service life of the screw is further prolonged.

Description

technical field [0001] The invention relates to the technical field of plastic machinery, in particular to a screw with a composite coating and a preparation method thereof. Background technique [0002] Screws are commonly used mechanical components. In particular, the screw belongs to the core component of the injection molding machine. According to statistics, there are more than 300,000 plastic machinery with production capacity in my country every year, of which injection molding machines and extruders account for more than 80%. However, the screw is very easy to damage or fail during the use of the injection molding machine. For example, in 1986, the wear and corrosion of barrels and screws caused losses of up to 2.5 billion US dollars to North American injection molding machine users. [0003] In addition, in order to improve the strength of plastic products, glass fibers, carbon fibers and asbestos fibers are often added to plastic products. Due to the addition o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00B29C45/60
CPCC23C28/324B29C45/60C23C28/34
Inventor 李庆超袁安素卢皑李艳春
Owner NAXAU NEW MATERIALS CORP