Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads

A thread surface, electrostatic spraying technology, applied to the surface coating liquid device, pretreatment surface, coating, etc., can solve the problems of shrinkage cavity, weak adhesion, and inability to withstand large torque, etc., to achieve The effects of strong adhesion, simplified structural design, and expanded design ideas

Inactive Publication Date: 2012-10-03
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current PEEK powder coating process has the following disadvantages: 1. The coating is thin, generally no more than 0.2mm thick; 2. It can only be sprayed on the smooth and flat surface of metal products, and it is impossible to obtain uniform coating on the thread surface. Consistent coating, easy to produce shrinkage cavity, orange peel and other phenomena; 3. The adhesion is not strong and cannot withstand large torque, so the insulation purpose cannot be achieved
The current coating process cannot meet the requirements

Method used

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  • Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads

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Effect test

Embodiment 1

[0034] Embodiment 1: see brief figure 1 , the coating process of electrostatically spraying polyether ether ketone powder on the thread surface of the drill collar of the present invention, the operation process of spraying polyether ether ketone powder on the thread surface of the drill collar is as follows:

[0035] Step 1, first pre-treat the surface of the workpiece, including:

[0036] 1) Sandblasting treatment: use quartz sand to perform sandblasting treatment on the sprayed area of ​​the workpiece, so that the surface roughness can reach Rz3.2-12.5μm;

[0037] 2) Spraying transition layer: thermal spraying nickel-aluminum alloy transition layer, the thickness of the transition layer is 0.05mm-0.15mm;

[0038] Step 2, workpiece installation and placement: place the workpiece in the spray heating incubator, put it into the bottom plate assembly, and connect the temperature control line;

[0039] Step 3, workpiece heating and temperature measurement, including:

[0040]...

Embodiment 2

[0049] Embodiment 2: This embodiment illustrates in more detail the process of spraying polyether ether ketone powder on the thread surface of the drill collar according to the present invention. The process flow includes: sandblasting—→ thermal spraying nickel-aluminum alloy transition layer—→ heating—→ Temperature measurement—→partial key heating—→temperature measurement—→electrostatic powder spraying—→insulation—→slow cooling.

[0050] Its specific implementation process:

[0051] A. Pretreatment of workpiece surface before spraying, including:

[0052] ⅰ. Sand blasting treatment. To protect the unsprayed surface of the workpiece, use quartz sand to blast the sprayed area of ​​the workpiece to make the surface roughness reach Rz3.2-12.5μm. Compressed air is used to blow off sand adhered to the surface, and the roughness in the circumferential direction is required to be uniform.

[0053] ⅱ. Spray transition layer. The nickel-aluminum alloy transition layer is thermally sp...

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Abstract

The invention relates to a coating process for performing electrostatic spraying of polyether-ether-ketone powder on the surfaces of threads. The coating process comprises the following steps of: pretreating the surface of a workpiece, namely performing blast sanding, and spraying a transition layer; putting the workpiece into a spraying heating heat-preserving box; heating the workpiece, namely 1) controlling target temperature in the spraying heating heat-preserving box to be 320 DEG C, and preheating the workpiece, 2) measuring the temperature of the workpiece after the actually-measured temperature in a temperature control box reaches the target temperature for 10 to 30 minutes, and 3) heating locally, namely heating a spraying area of the workpiece locally and emphatically; and spraying the polyether-ether-ketone powder to the workpiece, namely 1) spraying, 2) keeping the temperature, namely keeping the temperature of between 340 and 370 DEG C in space environment for 5 to 10 minutes, and after melting the polyether-ether-ketone powder completely, stopping heating, keeping the temperature, and cooling to room temperature with a furnace. By the coating process, a polyether-ether-ketone insulated coating which is smooth and uniform and has firm bonding force is formed on the surfaces of the threads, and the requirement of designers on insulation is met well.

Description

technical field [0001] The invention relates to a process for coating polyetheretherketone (PEEK) powder on the thread surface, in particular to a process for electrostatically spraying PEEK powder on the thread surface of a drill collar. Background technique [0002] PEEK (polyether ether ketone) powder is a new type of polymer material with a melting point of 334°C. It has the characteristics of high mechanical strength, high temperature resistance, impact resistance, flame retardancy, acid and alkali resistance, high wear resistance, and stable insulation performance. At present, due to its high price and few manufacturers, it is only used in a small amount in aerospace, military nuclear energy, petrochemical, medical machinery, precision instruments and other industries. Most of its products are molded, injection molded and extruded parts, and some of them are coated on the surface of metal products by electrostatic powder spraying process. However, the current PEEK pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/06B05D3/00
Inventor 夏升旺徐效亮姚士勇赵旻昕张勇倪艳邢书东
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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