CN102698941A - Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads - Google Patents
Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads Download PDFInfo
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- CN102698941A CN102698941A CN 201210187043 CN201210187043A CN102698941A CN 102698941 A CN102698941 A CN 102698941A CN 201210187043 CN201210187043 CN 201210187043 CN 201210187043 A CN201210187043 A CN 201210187043A CN 102698941 A CN102698941 A CN 102698941A
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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
The present invention relates to a kind ofly carry out the technology of polyether-ether-ketone (PEEK) powder coating, particularly relate to a kind of coating process that carries out electrostatic spraying polyether-ether-ketone powder on the drill collar threads surface in thread surface.
Background technology
PEEK (polyether-ether-ketone) powder belongs to the macromolecule new material, and its fusing point is at 334 ℃, has characteristics such as mechanical strength height, high temperature resistant, shock-resistant, fire-retardant, acid and alkali-resistance, wearability height, stable insulation.At present, because it costs an arm and a leg, reason such as manufacturer is few is only used in industries such as space flight and aviation, military project nuclear energy, petrochemical industry, medical machinery, precision instruments on a small quantity.Its goods with mold pressing, injection moulding, to extrude part in the majority, also have to adopt electrostatic powder coating process to carry out application on the metallic article surface.But present polyether-ether-ketone powder coating process exists following shortcoming: 1. coating is thin, and it is thick generally to be no more than 0.2mm; 2. only can the uniformity coating be can't obtain in thread surface, shrinkage cavity, phenomenons such as orange peel are prone to produce in smooth, smooth metallic article surface spraying; 3. bonding force is not firm, can't bear than high pulling torque power, thereby not reach the insulation purpose.
Be applied to the drill collar threads external coating; Especially require the polyether-ether-ketone coating of thread surface need reach controllable thickness, thickness uniformity; Smooth no shrinkage cavity, no leak source; Do not influence and be threaded and can bear than high pulling torque power (40kN.m) and coating is not destroyed, requirements such as appearance color uniformity.
Because the polyether-ether-ketone powder has fusing point height (334 ℃), own characteristics such as fusion temperature narrow range; And need spray use in thread surface, owing to " Faraday shield effect ", the bottom of thread is difficult to produce uniform coating when adopting electrostatic powder coating, is prone to produce the shrinkage cavity phenomenon; Not only to guarantee design thickness, more will bear than the high pulling torque effect and be not destroyed.This just requires coating evenly necessary, and bonding force is good, smooth no shrinkage cavity, and can satisfy insulating requirements.Present coating process can't meet the demands.
Summary of the invention
The present invention is directed to the prior art deficiency, propose a kind of process of insulation after the even spraying in drill collar threads surface polyether-ether-ketone powder reaches metal threaded the connection.
The technical scheme that the present invention adopted:
A kind of coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder, its flow process is following:
Step 1 is at first carried out preliminary treatment to surface of the work, comprising:
1) blasting treatment: adopt quartz sand that blasting treatment is carried out in the Workpiece painting zone, make surface roughness reach Rz3.2-12.5 μ m;
2) spraying transition zone: thermal spraying nickel alumin(i)um alloy transition zone, transition region thickness 0.05mm-0.15mm;
1) connects the attemperating unit power supply that sprays heater incubator, make spraying heater incubator internal object temperature be controlled at 320 ℃～330 ℃, carry out workpiece and preheat;
2) thermometric: after observed temperature reaches target temperature 10-30 minute in the spraying heater incubator, utilize contact high temperature thermometer actual measurement workpiece surface temperature;
3) local heat: when workpiece temperature during, local emphasis heating is carried out in the Workpiece painting zone, made the spraying area temperature reach 390 ℃ ± 5 ℃ of microcephalies, 370 ℃ ± 5 ℃ in major part near target temperature;
1) spraying: open the spraying operational observations window on the spraying heater incubator, start slewing, align thread groove, adopt the rifle of at the uniform velocity being careful, carry out 2-4 all over spraying (drill collar threads shaft shoulder face place needs perpendicular end surface to spray);
2) insulation: insulation is 5-10 minute in 340 ℃ of-370 ℃ of space environment temperature;
3) treat that the polyether-ether-ketone powder melts fully after, stop the heating, the insulation, cool to room temperature with the furnace.
The coating process of described drill collar threads surface electrostatic painting polyether-ether-ketone powder in the pre-treatment step, after workpiece is carried out blasting treatment, adopts compressed air to blow clean the surface adhesion grains of sand, requires circumferencial direction roughness uniformity; Behind the spraying transition zone, should keep surface of the work clean, dry, and should get into the spraying operation sequence as early as possible, be no more than 24 hours standing time in the air.
The coating process of described drill collar threads surface electrostatic painting polyether-ether-ketone powder when spraying operation, makes the spray gun powder outlet quantity be advisable with continuous column minimum, and the distance of spray gun and workpiece remains on 8-10cm, during spraying, walks the necessary uniformity of rifle; In the insulating process, should note observing the powder smelting situation, can adjust the goal-selling temperature according to actual conditions.
After accomplishing the spraying operation, need test, comprise workpiece:
1) appearance test: whether the inspection coating surface is smooth smooth, and color even is consistent, salient point must not be arranged, leak source, peeling and scar;
2) leak source check: utilize electric spark leak detector inspection coating leak source situation, if spark occurs, explaining has leak source here;
3) thickness check: utilize and detect helmet and screw with the spraying joint, measure place, slit both ends of the surface distance, with the contrast of spraying front distance, whether checking thickness is in acceptability limit;
4) assembling check: by matching requirements, utilizing hydraulic detachment to shelve, after being tightened to the prescribed torque value on the joint, utilize the insulation megameter to measure the two ends insulation values, is certified products greater than 100M Ω; Otherwise, defective.
Beneficial effect of the present invention:
1, the coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder of the present invention; Realized forming the polyether-ether-ketone insulating coating in smooth, uniformity, bonding force jail in thread surface; Well satisfied the requirement of designer to insulation; Mentality of designing has been expanded in the design that simplifies the structure, and the high pulling torque that can bear 40kN.m requires and is not destroyed.At present, this invention has applied to well satisfy design demand in the product design of SEMWD well logging during instrument insulated antenna in the oil well logging industry, in the reality well logging, has obtained good result of use.
2, coating process of the present invention can be applicable to spray on the basis on smooth metal surface at existing polyether-ether-ketone powder or solution; Further be extended to the drill collar threads surface through exploratory development; And proof polyether-ether-ketone solution when solidify thread groove and bottom because the tension force that self produces; The shrinkage cavity phenomenon is almost inevitable, has solved the drawback that screw thread and complex-shaped workpiece are limited by foreign technology and device-restrictive for a long time.When electrostatic powder coating has been abolished in theory in the improvement of walking gunman's method and spray distance control through to the control of spray gun powder outlet quantity, spraying the time because " Faraday shield effect "; The bottom of thread is difficult to produce uniform coating; Be prone to produce the phenomenon of shrinkage cavity, broken through a large amount of enterprises and individual's intrinsic idea.
3, the coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder of the present invention; Transition region thickness can not too thick requirement based on being threaded; And under the situation that does not influence the intensity that is threaded; Before spraying polyether-ether-ketone powder, being coated with thickness on the drill collar threads surface is the nickel alumin(i)um alloy transition zone of 0.05mm-0.15mm, has effectively improved the cohesive force between coating and the screw thread.The spraying heater incubator can adopt the mode of Infrared Heating, makes to shorten to 1-1.5 hour heat time heating time, shortens 3 times on traditional relatively mode of heating efficient, and has avoided the pollution to environment.
4, the present invention carries out the technology of polyether-ether-ketone powder coating on the drill collar threads surface, and disposable input expense is little, and success rate is high, and coating is even, and there is good social benefit in the bonding force jail.The present invention also can apply to similar other thread surface that insulating requirements is arranged, and can simplify greatly about the structural design of insulating requirements is arranged; The present invention also can apply to requirement on electric performance, surface anticorrosion requirement etc. and get the metal surface.
Description of drawings
Fig. 1: spraying heater incubator structural representation.
Label 1 is a casing among the figure, and 2 is bottom deck assembly, and 3 is the heating box assembly, and 4 is temperature sensor, and 5 are the assembling of spraying workpiece, and casing is provided with spraying operational observations window.
The specific embodiment
Embodiment one: referring to sketch 1, and the coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder of the present invention, its operating process at drill collar threads surface spraying polyether-ether-ketone powder is following:
Step 1 is at first carried out preliminary treatment to surface of the work, comprising:
1) blasting treatment: adopt quartz sand that blasting treatment is carried out in the Workpiece painting zone, make surface roughness reach Rz3.2-12.5 μ m;
2) spraying transition zone: thermal spraying nickel alumin(i)um alloy transition zone, transition region thickness 0.05mm-0.15mm;
1) workpiece preheats: 320 ℃ of spraying heater incubator goal-selling temperature preheat;
2) thermometric: after observed temperature reaches target temperature 10-30 minute in the spraying heater incubator, utilize contact high temperature thermometer actual measurement workpiece surface temperature;
3) local heat: when workpiece temperature during, local emphasis heating is carried out in the Workpiece painting zone, made the spraying area temperature reach 390 ℃ ± 5 ℃ of microcephalies, 370 ℃ ± 5 ℃ in major part near target temperature;
1) spraying operation: open the spraying operational observations window on the spraying heater incubator, start slewing, align thread groove, adopt the rifle of at the uniform velocity being careful, 2-4 time, drill collar threads shaft shoulder face place needs perpendicular end surface to spray;
2) insulation: 340 ℃ are incubated 5-10 minute;
3) after powder melts fully, break off electric brake, stop heating, insulation cools to room temperature with the furnace.
As shown in Figure 1, the spraying heater incubator that needs to use in the spraying operation comprises casing 1, is provided with heating box assembly 3 in the casing 1, and temperature sensor 4 is with the supporting attemperating unit that is provided with of heating box assembly.
Said spraying heater incubator is adapted at using on the slewing.The structural design of spray coating heat preservation case can be observed the thickness and the thawing situation of polyether-ether-ketone powder spraying in the whole spraying process intuitively; Realization is to the controllability of spraying process; Avoid workpiece to pass in and out the drawback of incubator repeatedly, improved the efficient of producing, guaranteed the quality and the thickness requirement of spraying.
Embodiment two: the explanation that present embodiment is more detailed the process of the present invention at drill collar threads surface spraying polyether-ether-ketone powder, its technological process comprises: sandblast-→ thermal spraying nickel alumin(i)um alloy transition zone-→ heating-→ thermometric-→ local emphasis heating-→ thermometric-→ electrostatic powder coating-→ insulation-→ slow cooling.
Its practical implementation process:
A. the preceding preliminary treatment to surface of the work of spraying comprises:
ⅰ. blasting treatment.The protection workpiece is sprayed surface not, adopts quartz sand that blasting treatment is carried out in the Workpiece painting zone, makes surface roughness reach Rz3.2-12.5 μ m.Compressed air blows clean the surface adhesion grains of sand, requires circumferencial direction roughness uniformity.
ⅱ. the spraying transition zone.Thermal spraying nickel alumin(i)um alloy transition zone is advisable about transition region thickness 0.1mm.
ⅲ. behind the spraying transition zone, should keep surface of the work clean, dry, must not touch spraying area, and should get into the spraying operation sequence as early as possible, be no more than 24 hours be advisable standing time in the air.
B. workpiece is installed and is placed
Place work piece is connected attemperating unit in the spraying heater incubator.
C. workpiece heats and thermometric, and process is following:
ⅰ. workpiece preheats.320 ℃ of temperature control box goal-selling temperature close a main switch, and preheat.
ⅱ. thermometric.When the temperature control box observed temperature reaches target temperature after half an hour, utilize contact high temperature thermometer actual measurement workpiece surface temperature.
ⅲ. local heat.When workpiece temperature during near 320 ℃, local emphasis heating is carried out in the Workpiece painting zone, make the spraying area temperature reach 390 ℃ ± 5 ℃ of microcephalies, major part is advisable for 370 ℃ ± 5 ℃.
D. workpiece carries out PEEK powder spraying operation:
ⅰ. the spraying operation.Open the spraying operational observations window on the spraying heater incubator, start slewing, align thread groove, adopt the rifle of at the uniform velocity being careful, carry out 2-4 and be advisable all over spraying, drill collar threads shaft shoulder face place needs perpendicular end surface to spray.During spraying, powder outlet quantity is advisable with continuous column minimum, and being advisable apart from 8-10cm of spray gun and workpiece during spraying, walked the necessary uniformity of rifle.
ⅱ. insulation.Insulation is 5-10 minute in 340 ℃ of-370 ℃ of space environment temperature, notes observing the powder smelting situation, can adjust goal-selling temperature (generally being no more than 330 ℃) according to actual conditions.
ⅲ. after powder melts fully, break off electric brake, stop heating, insulation cools to room temperature with the furnace.
Whether application is qualified for the workpiece good for spraying, need check as follows:
ⅰ. appearance test.Whether the inspection coating surface is smooth smooth, and color even is consistent, and salient point must not be arranged, leak source, and peeling and scar etc. are existing.
ⅱ. the leak source check.Utilize electric spark leak detector inspection coating leak source situation, if spark occurs, explaining has leak source here.
ⅲ. the thickness check.Utilize to detect helmet and screw with the spraying joint, measure place, slit both ends of the surface distance, with the contrast of spraying front distance, whether checking thickness is in acceptability limit.
ⅳ. the assembling check.By matching requirements, utilize hydraulic detachment to shelve, after being tightened to the prescribed torque value on the joint, utilize the insulation megameter to measure the two ends insulation values, be certified products greater than 100M Ω; Otherwise, defective.
Claims (3)
1. the coating process of a drill collar threads surface electrostatic painting polyether-ether-ketone powder, its flow process is following:
Step 1 is at first carried out preliminary treatment to surface of the work, comprising:
1) blasting treatment: adopt quartz sand that blasting treatment is carried out in the Workpiece painting zone, make surface roughness reach Rz3.2-12.5 μ m;
2) spraying transition zone: thermal spraying nickel alumin(i)um alloy transition zone, transition region thickness 0.05mm-0.15mm;
Step 2, workpiece are installed and placed: place work piece is in the spraying heater incubator;
Step 3, heated parts:
1) connects the attemperating unit power supply that sprays heater incubator, make spraying heater incubator internal object temperature be controlled at 320 ℃～330 ℃, carry out workpiece and preheat;
2) thermometric: after observed temperature reaches target temperature 10-30 minute in the spraying heater incubator, utilize contact high temperature thermometer actual measurement workpiece surface temperature;
3) local heat: when workpiece temperature surface during, local emphasis heating is carried out in the Workpiece painting zone, made the spraying area temperature reach 390 ℃ ± 5 ℃ of microcephalies, 370 ℃ ± 5 ℃ in major part near target temperature;
Step 4, workpiece is carried out polyether-ether-ketone powder spraying operation:
1) spraying: open the spraying operational observations window on the spraying heater incubator, start slewing, align thread groove, adopt the rifle of at the uniform velocity being careful, carry out 2-4 all over spraying;
2) insulation: insulation is 5-10 minute in 340 ℃ of-370 ℃ of space environment temperature;
After treating that the polyether-ether-ketone powder melts fully, stop heating, insulation cools to room temperature with the furnace.
2. the coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder according to claim 1; It is characterized in that: in the pre-treatment step; After workpiece is carried out blasting treatment, adopt compressed air to blow clean the surface adhesion grains of sand, require circumferencial direction roughness uniformity; Behind the spraying transition zone, should keep surface of the work clean, dry, and should get into the spraying operation sequence as early as possible, be no more than 24 hours standing time in the air.
3. the coating process of drill collar threads surface electrostatic painting polyether-ether-ketone powder according to claim 1 and 2; It is characterized in that: when spraying operation, the spray gun powder outlet quantity is advisable with continuous column minimum, the distance of spray gun and workpiece remains on 8-10cm; During spraying, walk the necessary uniformity of rifle; In the insulating process, should note observing the powder smelting situation, can adjust the goal-selling temperature according to actual conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210187043 CN102698941A (en) | 2012-06-08 | 2012-06-08 | Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads |
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| CN 201210187043 CN102698941A (en) | 2012-06-08 | 2012-06-08 | Coating process for electrostatic spraying of polyether-ether-ketone powder on surfaces of drill collar threads |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586175A (en) * | 2013-11-25 | 2014-02-19 | 大连路阳科技开发有限公司 | Electrostatic coating method for polyether-ether-ketone powder |
| CN104482026A (en) * | 2014-12-12 | 2015-04-01 | 中国船舶重工集团公司第七二五研究所 | Preservative treatment method of tail vane connecting rod threads |
-
2012
- 2012-06-08 CN CN 201210187043 patent/CN102698941A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586175A (en) * | 2013-11-25 | 2014-02-19 | 大连路阳科技开发有限公司 | Electrostatic coating method for polyether-ether-ketone powder |
| CN104482026A (en) * | 2014-12-12 | 2015-04-01 | 中国船舶重工集团公司第七二五研究所 | Preservative treatment method of tail vane connecting rod threads |
| CN104482026B (en) * | 2014-12-12 | 2016-06-29 | 中国船舶重工集团公司第七二五研究所 | A kind of method for anticorrosion treatment of tail vane connecting rod screw thread |
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Application publication date: 20121003 |