A coating composite preparation process suitable for slotted needles

A preparation process, technology of grooved needles, applied in metal material coating process, superimposed layer plating, coating, etc.

Active Publication Date: 2021-12-21
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a composite coating preparation process suitable for slotted needles, so as to overcome the difficulty in obtaining a smooth chromium coating on the needle hook and the inner wall surface of the needle slot at the same time in the prior art. defect

Method used

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  • A coating composite preparation process suitable for slotted needles
  • A coating composite preparation process suitable for slotted needles
  • A coating composite preparation process suitable for slotted needles

Examples

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Embodiment 1

[0027] After polishing, degreasing and derusting the grooved needles, put them into dilute acid for acid etching and activation for a period of time, clamp several grooved needles with a jig, and apply a pre-plating layer (Cu layer or Ni layer) on the surface of the grooved needles . After the pre-plating coating is finished, rinse the surface of the groove needle with flowing deionized water. At the same time, set the pH value of the chrome plating solution (pH=2), the required temperature (20°C) and the cathode current density (10A / dm 2 ) Within a suitable range, put the fixture with the grooved needle after cleaning into the chrome plating solution, and electroplate the grooved needle for a period of time (15min). After the electroplating is completed, the groove needle is taken out from the fixture, rinsed with flowing deionized water, dried in a vacuum oven, and measured (digital Vickers hardness tester, load 100g, loading time 10s) the microhardness of the groove needle...

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Abstract

The invention relates to a composite coating preparation process suitable for slotted needles. The process includes: activating the grooved needle, then preparing a pre-plating layer by electrodeposition and / or chemical deposition on the inner and outer walls of the needle groove to the needle hook, then preparing a chromium layer by electrodeposition, and finally heat-treating the coating. The process is simple to operate and easy to implement, and can overcome the problem that the traditional electroplating method is difficult to obtain a smooth coating on the hook of the groove needle and the inner wall surface of the needle groove at the same time. The microhardness of the obtained coating is equivalent to that of the traditional coating on the groove needle.

Description

technical field [0001] The invention belongs to the field of coating preparation by grooved needles, and in particular relates to a composite coating preparation process suitable for grooved needles. Background technique [0002] Warp knitting machine slot needle is one of the key parts on high-speed warp knitting machine. During the knitting process, the needle hook catches the yarn, the needle core is inserted into the deep groove of the grooved needle, and the grooved needle and the needle core cooperate with each other to reciprocate to complete the knitting process of the yarn. The long-term high-speed operation of the warp knitting machine will cause wear on the surface of the grooved needles, and the use of worn grooved needles will seriously affect the quality and production efficiency of textiles. Among them, the surface of the inner wall of the needle groove and the needle hook are the most important wear parts of the groove needle. [0003] To cope with this sit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D7/00C25D5/12C25D5/50C25D3/04C23C28/02C25D5/34
CPCC25D7/00C25D5/12C25D5/50C25D3/04C23C28/02C25D5/34
Inventor 朱世根洪子康骆祎岚丁浩白云峰狄平朱巧莲
Owner DONGHUA UNIV
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