Manufacturing method of heat pipe

Abstract

The invention discloses a manufacturing method of a heat pipe. The manufacturing method comprises the following steps: step 1, cutting a pipe; step 2, cleaning; step 3, head shrinking; step 4, rod insertion; step 5, filling powder; step 6, sintering; 7, pulling the rod; 8, tail shrinkage; ninthly, tail cutting is conducted; tenthly, tail welding is conducted; step 11, annealing; 12, water injection; step 13, primary degassing; step 14, carrying out secondary degassing; (15) welding a head; sixthly, size inspection is conducted; seventeenthly, temperature difference testing is conducted; eighteenthly, pipe bending is conducted; (19) shaping; step 20, hot pressing; 21, cold pressing section difference; step 22, aging test; (23) surface treatment; 24, helium leak detection is carried out; (25) performance testing; sixthly, appearance inspection is conducted; and (27) packaging. The heat pipe machining device has the advantages of being capable of well completing machining operation of heat pipes, convenient to operate, good in machining effect and convenient to popularize and use for enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of heat pipe processing, in particular to a method for manufacturing a heat pipe. Background Art

[0002] Heat pipes are generally hollow cylindrical tubes. When a temperature difference occurs at both ends of the heat pipe, the liquid at the evaporation end will quickly vaporize and bring heat to the condensation end at a very fast speed. The existing heat pipe processing has some processing defects and cannot meet the needs of enterprises for heat pipe processing and use.

[0003] In view of the above situation, it is necessary to improve the existing heat pipe so that it can meet the current needs for heat pipe processing and use. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for manufacturing a heat pipe, comprising the following steps:

[0005] Step 1: Cut the tube;

[0006] Step 2: Cleaning;

[0007] Step 3: Shrink the head;

[0008] Step 4: Insert the rod;

[0009] Step 5: Fill with powder;

[0010] Step 6: sintering;

[0011] Step 7: Pull out the stick;

[0012] Step 8: shrink the tail;

[0013] Step 9: Cut the tail;

[0014] Step 10: Solder tail;

[0015] Step 11: Annealing;

[0016] Step 12: water injection;

[0017] Step 13: primary degassing;

[0018] Step 14: Secondary degassing;

[0019] Step 15: welding head;

[0020] Step 16: Dimensional inspection;

[0021] Step 17: Temperature difference test;

[0022] Step 18: Bending the pipe;

[0023] Step 19: Plastic surgery;

[0024] Step 20: hot pressing;

[0025] Step 21: cold pressing step difference;

[0026] Step 22: Aging test;

[0027] Step 23: Surface treatment;

[0028] Step 24: Helium leak detection;

[0029] Step 25: Performance testing;

[0030] Step 26: Appearance inspection;

[0031] Step 27: Packaging.

[0032] To further supplement the technical solution, in the step one, the tube cutting is carried out according to customer needs, using the high-speed rotating saw blade of an automatic tube cutting machine to cut the purchased copper tube, wherein the cutting fluid is sprayed out from the saw blade at irregular intervals; in the step three, the head shrinking is carried out under normal conditions using a tube shrinking mold of an automatic tube shrinking machine to shrink the copper tube, wherein the tube shrinking mold is an eccentric mold; in the step four, the core rod is inserted into the heat pipe steadily using a ejection fixture.

[0033] To further supplement the technical solution, the sintering in step six is ​​to sinter the copper tube using an automatic push plate furnace, at a constant temperature of 980 degrees for 120 minutes, and nitrogen and hydrogen-nitrogen mixed gas are introduced for protection. The heat pipe is sintered under high temperature conditions and naturally cooled out of the furnace after sintering; in step seven, the rod pulling uses an automatic rod machine to smoothly pull out the sintered heat pipe and the core rod from the heat pipe.

[0034] To further supplement the technical solution, in the step eight, the tail shrinking is performed on the tail end of the heat pipe using an impact-type shrinking machine under normal conditions, the mold runs at a high speed, the ejection fixture moves forward smoothly, the mold angle is 30°, and the outer diameter is 2.5 mm; in the step ten, the welding tail is welded at the shrinkage point using a welding gun after the tail shrinkage; in the step eleven, the annealing is to place the product in an annealing furnace with protective gas nitrogen and nitrogen-hydrogen mixed gas, slowly heat it to 750°C, keep it for a sufficient time, and then cool it at an appropriate speed.

[0035] To further supplement the technical solution, the water injected in step twelve is tap water filtered by a water purifier, the resistivity of pure water is greater than ≧18MΩ·cm, and the pure water is injected into the heat pipe using a needle.

[0036] To further supplement the technical solution, the primary degassing in step thirteen is to use a primary degassing machine to insert the degassing port of the filled product into the vacuum degassing head, start the mechanical vacuum pump of the equipment for primary degassing, add vacuum oil to the vacuum pump, and perform sealing operation after the vacuum degree of each station is reached, and then use the hydraulic cylinder to rivet and seal the product degassing pipe; the secondary degassing in step fourteen is to put the product into the equipment positioning fixture, wherein the positioning fixture is preheated to 135°C for 8S, and there is residual non-condensable gas in the tube after the first degassing. By heating the bottom, the non-condensable gas is forced to the invalid end of the heat pipe, and the product degassing tube is clamped to the required specification range by the hydraulic cylinder, and the oil pressure of the second degassing is set to 80±5kg / cm 2 ; Clamp the pipe mouth into a U shape, and then weld it to ensure that the weld is full and free of sand, air and oxidation.

[0037] To further supplement the technical solution, the temperature difference test in step seventeen is to test the temperature difference of all the heat pipes after the degassing welding head. The heat pipe is placed stably on the heating block. The temperature of the heating block is 100 degrees. The head end of the heat pipe is at the heating block position. The temperature sensing line at the tail end senses the temperature of the heat pipe in real time to see if the heat pipe is not conductive and the temperature difference exceeds the specification.

[0038] To further supplement the technical solution, the bending in step 18 is based on customer requirements. The shape of each case is different, and the bending operation is performed by an automatic bending machine; the shaping in step 19 is that the heat pipe has some angles offset after bending, and it needs to be fully shaped and pre-pressed by the mold to ensure the angle of the heat pipe; the cold-pressed step difference in step 21 is based on customer requirements. The shape and step difference of the heat pipe are different, and different mold designs are required to meet the product requirements. The heat pipe is preheated on the heating plate at 280 degrees for 3 minutes, and then immediately taken to the mold for cold-pressing the step difference.

[0039] To further supplement the technical solution, the aging test in step 22 is to use an oven for aging after the heat pipe is cold pressed, the temperature is 200 degrees / time 8 hours, and the purpose of the aging test is mainly to check whether there is micro leakage at the head and tail ends of the heat pipe and the heat pipe body; the helium leak test in step 24 is to put the polished heat pipe into the helium detection equipment, adjust the equipment parameters to pressure 5KG / time 3H, the density of helium is smaller than that of air, and high pressure is used for pressure testing.

[0040] To further supplement the present technical solution, the performance test in step twenty-five is to use a performance testing machine to conduct a full inspection of the performance of the heat pipe. The power required for each case is different. The parameters are set according to the customer's requirements. The heat pipe is automatically placed in the test fixture, and the head end of the heat pipe is heated / the tail end is cooled to see whether the temperature difference between the head and tail of the heat pipe exceeds the required specifications. The equipment automatically determines whether the product is good or bad. The packaging in step twenty-seven is to first use an appearance inspection fixture to fully inspect and confirm the angle and size of the heat pipe, and then perform packaging operations according to the packaging regulations of each case.

[0041] The beneficial effect is that the processing operation of the heat pipe can be well completed, the operation is convenient, the processing effect is good, and it is easy to promote and use by enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall workflow of the present invention; DETAILED DESCRIPTION

[0043] In order to make the technical solution more clear to those skilled in the art, Figure 1 The technical solution of the present invention is described in detail:

[0044] A method for manufacturing a heat pipe comprises the following steps:

[0045] Step 1: Cut the tube;

[0046] Step 2: Cleaning;

[0047] Step 3: Shrink the head;

[0048] Step 4: Insert the rod;

[0049] Step 5: Fill with powder;

[0050] Step 6: sintering;

[0051] Step 7: Pull out the stick;

[0052] Step 8: shrink the tail;

[0053] Step 9: Cut the tail;

[0054] Step 10: Solder tail;

[0055] Step 11: Annealing;

[0056] Step 12: water injection;

[0057] Step 13: primary degassing;

[0058] Step 14: Secondary degassing;

[0059] Step 15: welding head;

[0060] Step 16: Dimensional inspection;

[0061] Step 17: Temperature difference test;

[0062] Step 18: Bending the pipe;

[0063] Step 19: Plastic surgery;

[0064] Step 20: hot pressing;

[0065] Step 21: cold pressing step difference;

[0066] Step 22: Aging test;

[0067] Step 23: Surface treatment;

[0068] Step 24: Helium leak detection;

[0069] Step 25: Performance testing;

[0070] Step 26: Appearance inspection;

[0071] Step 27: Packaging.

[0072] Among them, the pipe cutting in step one is based on customer needs. The product sizes and specifications are different. The purchased copper pipes are cut by using the high-speed rotating saw blade of the automatic pipe cutting machine; (the cutting fluid is sprayed out from the saw blade from time to time to ensure the life of the saw blade and the product is free of burrs and deformation).

[0073] Among them, cleaning in step 2: This process is an outsourced operation, which mainly cleans the oil stains on the inner wall of the copper tube to ensure the cleanliness of the heat pipe.

[0074] Among them, the shrinking in step three is to shrink the copper tube under normal conditions using an automatic tube shrinking machine tube shrinking mold (the mold rotates at a high speed / the tube shrinking mold is an eccentric mold to ensure that the outer diameter of the shrinking is within the required range).

[0075] Among them, in step 4, the rod insertion is to use a lifting fixture to steadily insert the core rod into the heat pipe.

[0076] Among them, the powder filling in step five is based on the powder quantity requirements of the heat pipe, and the appropriate parameters are adjusted to ensure that there is a small amount of residual copper powder in the powder cup after the equipment vibrates the powder (there is a special beam in the powder cup to control the core rod to be centered and not eccentric).

[0077] Among them, the sintering in step six is ​​to use an automatic push plate furnace to sinter the copper tube (980 degrees constant temperature for 120 minutes), and nitrogen and hydrogen nitrogen mixed gas are introduced for protection. The heat pipe is sintered under high temperature conditions and naturally cooled after sintering.

[0078] Among them, the rod pulling in step seven is to use an automatic rod machine to smoothly pull out the sintered heat pipe and the core rod from the heat pipe.

[0079] Among them, the tail shrinking in step eight is to shrink the tail end of the heat pipe using an impact-type shrinking machine under normal conditions, the mold runs at high speed, the ejecting fixture moves forward steadily, the mold angle is 30°, and the outer diameter is 2.5mm.

[0080] Among them, the welding tail in step ten is to use a welding gun to weld the shrinkage after shrinking the tail, (argon gas / tungsten needle / welding current / welding time) to ensure that the weld point is full and there is no leakage of sand holes.

[0081] Among them, the annealing in step 11 is to put the product into an annealing furnace with protective gas nitrogen and nitrogen-hydrogen mixed gas, slowly heat it to a certain temperature (electric heating, 750°C), keep it for a sufficient time, and then cool it at an appropriate speed. The purpose is to: reduce the hardness of the product, improve its cutting performance, eliminate residual stress, stabilize the size, reduce deformation and crack tendency; refine the grain, adjust the organization, and eliminate organizational defects.

[0082] Among them, the water injection in step 12 is tap water that has been filtered by a pure water machine. The resistivity of pure water must be greater than ≧18MΩ·cm. A needle is used to inject pure water into the heat pipe (water injection amount ±0.02g).

[0083] Among them, the degassing in step thirteen is to use a degassing machine (Edward vacuum pump for vacuum degassing) to insert the degassing port of the filled product into the vacuum degassing head, start the equipment's built-in mechanical vacuum pump for degassing, add vacuum oil to the vacuum pump, and perform sealing operations after the vacuum degree is reached at each station. Finally, use a hydraulic cylinder to rivet and seal the product degassing pipe.

[0084] Among them, the secondary degassing in step 14 is to put the product into the equipment positioning fixture (the positioning fixture preheating temperature is 135℃ time 8S). After the first degassing, there is residual non-condensable gas in the tube. By heating the bottom, the non-condensable gas is forced to the ineffective end of the heat pipe. The product degassing tube is clamped to the required specification range by the hydraulic cylinder. The second degassing oil pressure is set to 80±5kg / cm 2 Clamp the pipe mouth into a U shape, and then weld it (welding gun / argon gas / tungsten needle / welding time) to ensure that the weld is full and free of sand, air and oxidation.

[0085] Among them, the temperature difference test in step seventeen is a temperature difference test of all heat pipes after the degassing welding head. The heat pipe is placed stably on the heating block (the temperature of the heating block is 100 degrees). The head end of the heat pipe is at the heating block position, and the temperature sensing line at the tail end senses the temperature of the heat pipe in real time to see if the heat pipe is not conductive and the temperature difference exceeds the specification.

[0086] Among them, the bending of the pipe in step 18 is based on customer requirements. The shape of each case is different, and the bending operation (the size of the round wheel / the bending angle) is performed by an automatic bending machine.

[0087] Among them, the shaping in step nineteen is that the heat pipe has a partial angle deviation after bending, and it needs to be fully shaped and pre-pressed through the mold to ensure the angle of the heat pipe (hydraulic press / shaping mold).

[0088] Among them, the cold pressing step difference in step 21 is based on customer requirements. The shape and step difference of the heat pipe are different, and different mold designs are required to meet the product requirements (width / thickness / height of the step difference of the heat pipe). The heat pipe is preheated on the heating plate (preheated at 280 degrees for 3 minutes) and then immediately taken into the mold for cold pressing of the step difference.

[0089] Among them, in step 22, the aging test: after the heat pipe is cold pressed, it needs to be aged in an oven (temperature 200 degrees / time 8 hours). The purpose of the aging test is mainly to check whether there is micro leakage at the head and tail ends of the heat pipe and the heat pipe body.

[0090] Among them, surface treatment in step 23: This process is an outsourced process. After the heat pipe is formed and aged, serious oxidation occurs on the surface of the heat pipe. Degreasing / pickling / rinsing / anti-oxidation are performed to ensure that the surface of the heat pipe is clean.

[0091] Among them, in step 24, helium leak detection: put the polished heat pipe into the helium detection equipment, adjust the equipment parameters to pressure 5KG / time 3H, the density of helium is smaller than that of air, and use high pressure for pressure testing.

[0092] Among them, the performance test in step 25: use the performance test machine to conduct a full inspection of the performance of the heat pipe. The power required for each case is different. The parameters are set according to the customer's requirements. The heat pipe is automatically placed in the test fixture. The head end of the heat pipe is heated / the tail end is cooled to see if the temperature difference between the head and tail of the heat pipe exceeds the required specifications. The equipment automatically determines whether the product is good or bad. (heating block temperature / heating position of the heat pipe / heating position of the heat pipe / water tank temperature)

[0093] Among them, in step 27, packaging: first use the appearance inspection fixture to fully inspect and confirm the angle and size of the heat pipe, and then carry out packaging operations according to the packaging regulations of each case.

[0094] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a heat pipe, characterized in that: The following steps are involved: Step 1: Cut the tube; Step 2: Cleaning; Step 3: Shrink the head; Step 4: Insert the rod; Step 5: Fill with powder; Step 6: sintering; Step 7: Pull out the stick; Step 8: shrink the tail; Step 9: Cut the tail; Step 10: Solder tail; Step 11: Annealing; Step 12: water injection; Step 13: primary degassing; Step 14: Secondary degassing; Step 15: welding head; Step 16: Dimensional inspection; Step 17: Temperature difference test; Step 18: Bending the pipe; Step 19: Plastic surgery; Step 20: hot pressing; Step 21: cold pressing step difference; Step 22: Aging test; Step 23: Surface treatment; Step 24: Helium leak detection; Step 25: Performance testing; Step 26: Appearance inspection; Step 27: Packaging.

2. The method for manufacturing a heat pipe according to claim 1, characterized in that: In the step 1, the tube cutting is performed according to customer needs, and the purchased copper tube is cut by using the saw blade of an automatic tube cutting machine rotating at high speed, wherein the cutting fluid is sprayed out from the saw blade at irregular intervals; in the step 3, the head shrinking is performed by shrinking the copper tube under normal conditions using a tube shrinking mold of an automatic tube shrinking machine, wherein the tube shrinking mold is an eccentric mold; in the step 4, the core rod is inserted into the heat pipe steadily using a ejection fixture.

3. The method for manufacturing a heat pipe according to claim 1, characterized in that: In the step six, the copper tube is sintered by an automatic push plate furnace at a constant temperature of 980 degrees for 120 minutes, and nitrogen and hydrogen-nitrogen mixed gas are introduced for protection. The heat pipe is sintered under high temperature conditions and naturally cooled out of the furnace after sintering. In the step seven, the rod pulling is performed by an automatic rod machine to smoothly pull out the sintered heat pipe and the core rod from the heat pipe.

4. The method for manufacturing a heat pipe according to claim 1, characterized in that: In the step eight, the tail shrinking is performed under normal conditions using an impact-type shrinking machine to shrink the tail end of the heat pipe, the mold runs at a high speed, the ejector fixture moves forward smoothly, the mold angle is 30°, and the outer diameter is 2.5 mm; in the step ten, the welding tail is welded at the shrinkage point using a welding gun after the tail shrinkage; in the step eleven, the annealing is performed by placing the product in an annealing furnace with protective gas nitrogen and nitrogen-hydrogen mixed gas, slowly heating to 750°C, maintaining for a sufficient time, and then cooling at an appropriate speed.

5. The method for manufacturing a heat pipe according to claim 1, characterized in that: The water used in step 12 is tap water filtered by a water purifier. The resistivity of pure water must be greater than ≧18MΩ·cm. The pure water is injected into the heat pipe using a needle.

6. The method for manufacturing a heat pipe according to claim 1, characterized in that: The primary degassing in step thirteen is to use a primary degassing machine to insert the degassing port of the filled product into the vacuum degassing head, start the mechanical vacuum pump of the equipment for primary degassing, add vacuum oil to the vacuum pump, and perform sealing operation after the vacuum degree of each station is reached, and then use the hydraulic cylinder to rivet and seal the product degassing pipe; the secondary degassing in step fourteen is to put the product into the equipment positioning fixture, wherein the positioning fixture is preheated to 135℃ for 8S, and there is residual non-condensable gas in the tube after the primary degassing. By heating the bottom, the non-condensable gas is forced to the invalid end of the heat pipe, and the product degassing pipe is clamped to the required specification range by the hydraulic cylinder, and the secondary degassing oil pressure is set to 80±5kg / cm 2 ; Clamp the pipe mouth into a U shape, and then weld it to ensure that the weld is full and free of sand, air and oxidation.

7. The method for manufacturing a heat pipe according to claim 1, characterized in that: The temperature difference test in step seventeen is to test the temperature difference of all the heat pipes after the degassing welding head. The heat pipe is placed stably on the heating block. The temperature of the heating block is 100 degrees. The head end of the heat pipe is at the heating block position. The temperature sensing line at the tail end senses the temperature of the heat pipe in real time to see if the heat pipe has no thermal conductivity and the temperature difference exceeds the specification.

8. The method for manufacturing a heat pipe according to claim 1, characterized in that: The bending in step 18 is based on customer requirements. The shape of each case is different, and the bending operation is performed by an automatic bending machine; the shaping in step 19 is that the heat pipe has a partial angle deviation after bending, and it needs to be fully shaped and pre-pressed by the mold to ensure the angle of the heat pipe; the cold pressing step difference in step 21 is based on customer requirements. The shape and step difference of the heat pipe are different, and different mold designs are required to meet the product requirements. The heat pipe is preheated on the heating plate at 280 degrees for 3 minutes, and then immediately taken into the mold for cold pressing of the step difference.

9. The method for manufacturing a heat pipe according to claim 1, characterized in that: The aging test in step 22 is to use an oven for aging after the heat pipe is cold pressed, with a temperature of 200 degrees / time of 8 hours. The purpose of the aging test is mainly to check whether there are micro leaks at the head and tail ends of the heat pipe and the heat pipe body; the helium leak test in step 24 is to put the polished heat pipe into the helium detection equipment, adjust the equipment parameters to a pressure of 5KG / time of 3H, the density of helium is smaller than that of air, and high pressure is used for pressure testing.

10. The method for manufacturing a heat pipe according to claim 1, characterized in that: The performance test in step 25 is to use a performance tester to conduct a full inspection of the performance of the heat pipe. The power required for each case is different. The parameters are set according to the customer's requirements. The heat pipe is automatically placed in the test fixture, and the head end of the heat pipe is heated and the tail end is cooled to see whether the temperature difference between the head and tail of the heat pipe exceeds the required specifications. The equipment automatically determines whether it is a good product or a defective product. The packaging in step 27 is to first use an appearance inspection fixture to fully inspect and confirm the angle and size of the heat pipe, and then perform packaging operations according to the packaging regulations of each case.

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