A pipe necking device and processing method for a VC heat pipe

Abstract

The present invention relates to the field of metal pipe processing, and provides a pipe necking device and a processing method for VC heat pipes. The clamping mechanism of this device is arranged at one end on the pedestal, and is used for clamping one end of the VC heat pipe to be processed and driving it to rotate; the moving processing mechanism is arranged on one side of the other end along the direction parallel to the VC heat pipe to be processed, and has a friction heating block that can perform friction heating on the other end of the VC heat pipe before extrusion and maintain contact during extrusion; the friction heating block can be in line contact with the outer wall of the VC heat pipe to be processed; the extrusion mechanism is arranged at the other end on the pedestal along the axial direction of the VC heat pipe to be processed, and is used for axially extruding the other end of the VC heat pipe to be processed. The present invention can form the starting point of the necking processing where the pipe wall becomes thicker. This thicker part of the pipe wall becomes thinner again after the necking operation, but is almost the same as the pipe walls of other parts. Therefore, the stress at the processing part is reduced, and the occurrence of dangerous cross-sections is avoided.

Description

Technical Field

[0001] The present invention relates to the field of metal pipe processing, and particularly to a pipe necking device and processing method for VC heat pipes. Background Art

[0002] A VC heat pipe (Vapor Chamber) is an efficient heat conduction element, and its principle is to utilize the water in the cavity to absorb heat when changing from liquid to gas. When the gas touches a region with a lower temperature, it condenses into a liquid and releases heat. The liquid then flows back to the heating region through the capillary structure (wick) in the cavity, and this cycle repeats to carry away and dissipate the heat generated at the heating part.

[0003] When performing pipe necking operations for VC heat pipes during pipe sealing and joining of round pipes with different diameters, a pipe necking machine is required. The rotary pipe shrinking technology is a commonly used pipe necking technology, and its principle is as follows: Use a clamping mechanism to hold one end of a metal round pipe and drive it to rotate, heat the other end of the metal round pipe with a flame. When the head of the metal round pipe is heated to the molten state, use a forming die to shape the heated head of the metal round pipe until the required shape is achieved. Among them, the force application point on the metal round pipe changes from point to line and then from line to surface, and at the same time, a certain pressure is applied in a certain direction to make the round pipe deform and flow along this direction to form a certain shape.

[0004] After the pipe shrinking operation is completed, the metal round pipes with the same original diameter form a sequentially connected original diameter pipe part, a connection transition part, and a pipe part with a reduced diameter after necking. The connection transition part can also be called the neck, which is also the starting point of the pipe shrinking process corresponding to the original diameter metal round pipe. Since the above pipe shrinking operation is completed by forcibly squeezing the metal round pipe, the wall thickness of the neck will become thinner, and at the same time, the stress on the neck is very large, becoming a dangerous cross-section and affecting the strength of the workpiece. Summary of the Invention

[0005] Based on this, in view of the problems existing in the current rotary pipe shrinking technology, it is necessary to provide a pipe necking device and processing method for VC heat pipes to avoid the neck becoming a dangerous cross-section after the pipe shrinking operation.

[0006] The above object is achieved by the following technical solutions:

[0007] The present invention provides a pipe necking device for VC heat pipes, which includes a pedestal and a clamping mechanism. The clamping mechanism is arranged at one end of the pedestal and is used to clamp one end of the VC heat pipe to be processed and can drive the VC heat pipe to rotate. It also includes a moving processing mechanism and an extrusion mechanism. The moving processing mechanism is arranged on one side of the other end of the VC heat pipe to be processed along a direction parallel to the VC heat pipe to be processed, and has a friction heating block that can perform friction heating on the other end of the VC heat pipe before extrusion and maintain contact during extrusion. The friction heating block has a head that can make line contact with the outer wall of the VC heat pipe to be processed. The extrusion mechanism is arranged at the other end of the pedestal along the axial direction of the VC heat pipe to be processed and is used to axially extrude the other end of the VC heat pipe after friction heating.

[0008] In one embodiment, the clamping mechanism includes a motor arranged on the pedestal and a chuck installed on the rotating shaft of the motor.

[0009] In one embodiment, an assisting fixture is arranged on the pedestal between the clamping mechanism and the moving processing mechanism, and the assisting fixture is used to assist in clamping the VC heat pipe to be processed.

[0010] In one embodiment, the assisting fixture includes a bearing seat, a bearing and two threaded rods. The two threaded rods are respectively arranged vertically on both sides of the VC heat pipe to be processed. One support plate is arranged at each end of the bearing seat, and the two support plates are respectively sleeved on the two threaded rods. The bearing is arranged in the bearing seat.

[0011] In one embodiment, the bearing seat is composed of an upper semi-circular part and a lower semi-circular part arranged opposite to each other up and down, and the bearing is a bearing composed of two semi-circular structures.

[0012] In one embodiment, an adjusting nut is respectively arranged on the two threaded rods on the upper and lower sides of the corresponding support plate.

[0013] In one embodiment, the moving processing mechanism includes a lower feed seat slidably arranged on the pedestal along a direction parallel to the VC heat pipe to be processed and an upper feed seat slidably arranged on the lower feed seat along a direction perpendicular to this direction. The friction heating block is arranged at one end of the upper feed seat close to the VC heat pipe to be processed.

[0014] In one embodiment, the friction heating block is made of a high-temperature resistant metal.

[0015] In one embodiment, the extrusion mechanism includes an extrusion support base disposed on the pedestal and an electric control telescopic cylinder disposed on the extrusion support base along the axial direction of the VC heat pipe to be processed. An extrusion block is provided at the head of the telescopic rod of the electric control telescopic cylinder; the extrusion block is cylindrical and has a diameter larger than the outer diameter of the VC heat pipe to be processed.

[0016] The present invention also provides a processing method based on the above-mentioned pipe necking device for VC heat pipes, which is used to form a thickened starting point for pipe necking before the pipe necking operation of the VC heat pipe to be processed, and includes the following steps:

[0017] Clamp one end of the VC heat pipe to be processed on the clamping mechanism, and use the clamping mechanism to drive the VC heat pipe to be processed to rotate;

[0018] Make the friction heating block of the mobile processing mechanism in line contact with the friction heating part at the other end of the VC heat pipe to be processed, and then perform friction heating on the rotating friction heating part; the friction heating part is the starting point for pipe necking of the VC heat pipe to be processed plus a section of allowance before this place, and the length of the allowance is determined according to the thickness and caliber of the VC heat pipe to be processed;

[0019] When the friction heating part of the VC heat pipe to be processed is heated to the molten state, the extrusion mechanism axially extrudes the other end of the rotating VC heat pipe to be processed, and when performing axial extrusion, the friction heating block continues to be in line contact with the outer wall of the VC heat pipe, so that the friction heating part is stacked and thickened towards the inside of the VC heat pipe, and after the length of the allowance of the friction heating part is reduced, a new starting point for pipe necking is formed.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a pipe necking device and a processing method for VC heat pipes. The clamping mechanism in the necking device is arranged at one end on the pedestal, and is used for clamping one end of the VC heat pipe to be processed and driving the VC heat pipe to rotate; the moving processing mechanism is arranged on one side of the other end of the VC heat pipe to be processed along the direction parallel to the VC heat pipe to be processed, and has a friction heating block capable of performing friction heating before extrusion and maintaining contact during extrusion on the other end of the VC heat pipe. The friction heating block has a head capable of making line contact with the outer wall of the VC heat pipe to be processed; the extrusion mechanism is arranged at the other end of the pedestal along the axial direction of the VC heat pipe to be processed, and is used for axially extruding the other end of the VC heat pipe to be processed after friction heating. The processing method used in this device is to heat and compress the original starting point of the pipe shrinking process plus a section of margin before this starting point before the traditional necking operation, so as to form a starting point of the pipe shrinking process where the pipe wall folds and thickens. Then, on this basis, a necking operation is carried out, so that this part of the thicker pipe wall becomes thinner again after the necking operation, but is almost the same as the pipe walls of other parts. Therefore, the stress at the processing part is reduced, the appearance of dangerous cross-sections is avoided, and the quality of the workpiece is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic diagram of the overall structure of the pipe necking device for VC heat pipes;

[0023] Figure 2 is Figure 1 front view of;

[0024] Figure 3 is Figure 1 top view of;

[0025] Figure 4 FIG. is a schematic diagram of the structure of the assisting fixture;

[0026] Figure 5 FIG. is a cross-sectional view of the VC heat pipe after preliminary treatment;

[0027] Figure 6 FIG. is a schematic diagram of the stress on the VC heat pipe during the necking operation in the prior art;

[0028] Figure 7 FIG. is a schematic diagram of the stress on the VC heat pipe during the necking operation in the present invention.

[0029] Wherein:

[0030] 101, pedestal; 102, motor; 103, chuck; 104, assisting fixture; 105, moving processing mechanism; 106, extrusion mechanism; 200, VC heat pipe to be processed; 201, compressed VC heat pipe; 1041, bearing seat; 1042, bearing; 1043, threaded rod, 1044, adjusting nut. DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The serial numbers assigned to the components in this document itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" used in this application, unless otherwise specifically stated, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] As Figures 1-3 shown, the present invention provides a pipe necking device for a VC heat pipe, including a pedestal 101, a clamping mechanism, a moving processing mechanism 105 and an extrusion mechanism 106. The clamping mechanism is arranged at one end on the pedestal 101 and is used for clamping one end of the VC heat pipe 200 to be processed and can drive the VC heat pipe to rotate. The moving processing mechanism 105 is arranged on one side of the other end of the VC heat pipe 200 to be processed along a direction parallel to the VC heat pipe 200 to be processed, and has a friction heating block capable of performing friction heating on the other end of the VC heat pipe before extrusion and maintaining contact during extrusion. The friction heating block has a head that can be in line contact with the outer wall of the VC heat pipe 200 to be processed. The extrusion mechanism 106 is arranged at the other end on the pedestal 101 along the axial direction of the VC heat pipe 200 to be processed and is used for axially extruding the other end of the VC heat pipe 200 to be processed after friction heating.

[0035] When this device is in use, the friction heating block moves to the friction heating part of the to-be-processed VC heat pipe 200. The friction heating part is the starting point of the necking process of the to-be-processed VC heat pipe 200 plus a section of allowance before this point, and the length of the allowance is determined according to the thickness and diameter of the to-be-processed VC heat pipe 200. The friction heating block is made of high-temperature-resistant metal. The friction heating block maintains a line contact with this friction heating part. As the to-be-processed VC heat pipe 200 continues to rotate, this friction heating part will be friction-heated to the molten state; then the extrusion mechanism 106 axially extrudes the other end of the to-be-processed VC heat pipe 200, so that the friction heating part in the molten state stacks and thickens towards the inside of the VC heat pipe. Finally, after the length of the allowance of this friction heating part is reduced, a new starting point for the necking process is formed again. And during the above axial extrusion process, the to-be-processed VC heat pipe 200 is in a rotating state, and the friction heating block and this friction heating part always maintain a line contact state to ensure that this friction heating part can stack towards the inside of the VC heat pipe.

[0036] The clamping mechanism includes a motor 102 arranged on the pedestal 101 and a chuck 103 installed on the rotating shaft of the motor 102. The motor 102 is used to drive the chuck 103 to rotate, and one end of the to-be-processed VC heat pipe 200 is clamped by the chuck 103, and the to-be-processed VC heat pipe 200 can rotate together with the chuck 103.

[0037] An assisting fixture 104 is arranged on the pedestal 101 and between the clamping mechanism and the moving processing mechanism 105. The assisting fixture 104 is used to assist in clamping the to-be-processed VC heat pipe 200. The assisting fixture 104 does not affect the rotation of the to-be-processed VC heat pipe 200. The assisting fixture 104 is arranged at a position corresponding to the middle part of the to-be-processed VC heat pipe 200 and is used to assist in supporting the to-be-processed VC heat pipe 200 to ensure that this device can process to-be-processed VC heat pipes 200 with a greater length.

[0038] As Figure 4 shown, the assisting fixture 104 includes a bearing seat 1041, a bearing 1042 and two threaded rods 1043; the two threaded rods 1043 are symmetrically and vertically arranged on both sides of the to-be-processed VC heat pipe 200 respectively. One support plate is arranged at each end of the bearing seat 1041, and the two support plates are respectively sleeved on the two threaded rods 1043; the bearing 1042 is arranged in the bearing seat 1041. The outer ring of the bearing 1042 is fixed to the bearing seat 1041, and the to-be-processed VC heat pipe 200 is inserted into the inner ring of the bearing 1042. Adjusting nuts 1044 are respectively arranged on the two threaded rods 1043 and on the upper and lower sides of the corresponding support plates. Loosen the adjusting nuts 1044, adjust the height of the bearing seat 1041 to be appropriate according to the size of the to-be-processed VC heat pipe 200, and then tighten the adjusting nuts 1044.

[0039] The bearing housing 1041 is composed of an upper semi-circular part and a lower semi-circular part which are arranged opposite to each other up and down. The bearing 1042 is a bearing composed of two semi-circular structures, so as to facilitate the disassembly of the bearing housing 1041 and the bearing 1042 and the loading of the VC heat pipe 200 to be processed.

[0040] The moving processing mechanism 105 includes a lower feed seat slidably arranged on the pedestal 101 along a direction parallel to the VC heat pipe 200 to be processed and an upper feed seat slidably arranged on the lower feed seat along a direction perpendicular to this direction. The friction heating block is arranged at one end of the upper feed seat close to the VC heat pipe 200 to be processed. The lower feed seat can be installed on the pedestal 101 by using a lead screw nut mechanism in the prior art, and the upper feed seat can also be installed on the lower feed seat by using a lead screw nut mechanism in the prior art. When processing this device, first move the whole moving processing mechanism 105 to a position flush with the friction heating part of the VC heat pipe 200 to be processed, and then make the upper feed seat approach this friction heating part until the friction heating block is in line contact with this friction heating part.

[0041] The extrusion mechanism 106 includes an extrusion support seat fixedly arranged on the pedestal 101 and an electric control telescopic cylinder arranged on the extrusion support seat along the axial direction of the VC heat pipe 200 to be processed. An extrusion block is arranged at the head of the telescopic rod of the electric control telescopic cylinder; the extrusion block is cylindrical. The cylindrical extrusion block faces the VC heat pipe 200 to be processed, and its diameter is larger than the outer diameter of the VC heat pipe 200 to be processed, so as to facilitate the extrusion of the VC heat pipe 200 to be processed.

[0042] The present invention also provides a processing method based on the above-mentioned pipe necking device for VC heat pipes, which is used for preliminary processing of the VC heat pipe 200 to be processed before the pipe necking operation to form a thickened starting place for the pipe necking processing, and includes the following steps:

[0043] Clamp one end of the VC heat pipe 200 to be processed on the clamping mechanism, and drive the VC heat pipe 200 to be processed to rotate by using the clamping mechanism;

[0044] Make the friction heating block of the moving processing mechanism 105 be in line contact with the friction heating part at the other end of the VC heat pipe 200 to be processed, and then perform friction heating on the rotating friction heating part; the friction heating part is the starting place for the pipe necking processing of the VC heat pipe 200 to be processed plus a section of allowance before this place, and the length of the allowance is determined according to the thickness and caliber of the VC heat pipe 200 to be processed;

[0045] When the friction heating part of the to-be-processed VC heat pipe 200 is heated to the molten state, the extrusion mechanism 106 axially extrudes the other end of the rotating to-be-processed VC heat pipe 200, and when performing the axial extrusion, the friction heating block continues to maintain line contact with the outer wall of the VC heat pipe, so that the friction heating part is stacked and thickened towards the inside of the VC heat pipe, and after the length of the margin of the friction heating part is reduced, the starting point of the necking process is re-formed.

[0046] The VC heat pipe after the preliminary treatment is as Figure 5 shown. Then, continue to adjust the mobile processing mechanism 105 to perform the subsequent necking operation on the compressed VC heat pipe 201, and this process is the same as the prior art. However, after the necking operation on the thickened starting point of the necking process, the corresponding pipe wall becomes thinner again, but the pipe wall of the formed neck (or called the connection transition part) is almost the same thickness as the pipe walls of other parts, so the stress at the processing part is reduced, the appearance of a dangerous cross-section is avoided, and the quality of the workpiece is guaranteed.

[0047] The length of the margin is determined according to the thickness and caliber of the to-be-processed VC heat pipe 200. The thicker the thickness (pipe wall thickness) of the VC heat pipe, the more the stacking amount per unit length of the VC heat pipe after processing, so the thicker the VC heat pipe, the shorter the length of the margin can be; and the greater the change in caliber before and after the necking operation, the more serious the deformation of the pipe wall at the starting point of this necking process, and the greater the length of the selected margin should be.

[0048] Figure 6 Fig. is a schematic diagram of the stress suffered by the VC heat pipe that has not been processed by the method of the present invention during the necking process in the prior art; Figure 7 Fig. is a schematic diagram of the stress suffered by the VC heat pipe with the same other attributes processed by the method of the present invention during the necking operation. By comparing the two, it can be clearly seen that the stress at the processing part of the latter is smaller, which can be used as the R & D proof and theoretical basis of the present invention.

[0049] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0050] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A pipe shrinking device for VC heat pipes, used for preliminary processing of VC heat pipes to be processed before shrinking operation to form a thickened shrinking starting point, comprising a pedestal and a clamping mechanism, wherein the clamping mechanism is arranged at one end of the pedestal, used for clamping one end of the VC heat pipe to be processed and driving the VC heat pipe to rotate; characterized in that: The invention also includes a moving processing mechanism and an extrusion mechanism; the moving processing mechanism is arranged on one side of the other end of the VC heat pipe to be processed along a direction parallel to the VC heat pipe to be processed, and has a friction heating block capable of performing friction heating on the other end of the VC heat pipe before extrusion and maintaining contact during extrusion; the moving processing mechanism includes a lower feed seat slidably arranged on the seat along a direction parallel to the VC heat pipe to be processed and an upper feed seat slidably arranged on the lower feed seat along a direction perpendicular to the direction, and the friction heating block is arranged at one end of the upper feed seat close to the VC heat pipe to be processed; the friction heating block has a head that can make line contact with the outer wall of the VC heat pipe to be processed; the extrusion mechanism is arranged on the other end of the seat along the axial direction of the VC heat pipe to be processed, and is used to axially extrude the other end of the VC heat pipe to be processed after friction heating. When in use, the friction heating block moves to the friction heating part of the VC heat pipe to be processed, and the friction heating part is the starting point of the shrinkage processing of the friction heating part of the VC heat pipe to be processed plus a section of surplus before the point, and the length of the surplus is determined according to the thickness and caliber of the VC heat pipe to be processed.

2. The VC heat pipe constriction device according to claim 1, characterized in that: The clamping mechanism comprises a motor arranged on the base and a chuck mounted on the rotating shaft of the motor.

3. The pipe shrinking device for VC heat pipe according to claim 1, characterized in that: An assisting clamp is arranged on the pedestal and between the clamping mechanism and the moving processing mechanism, and the assisting clamp is used to assist in clamping the VC heat pipe to be processed.

4. The pipe shrinking device for VC heat pipe according to claim 3, characterized in that: The assisting fixture includes a bearing seat, a bearing and two threaded rods; the two threaded rods are vertically arranged on both sides of the VC heat pipe to be processed, and a support plate is respectively arranged at both ends of the bearing seat, and the two support plates are respectively sleeved on the two threaded rods; the bearing is arranged in the bearing seat.

5. The pipe shrinking device for VC heat pipe according to claim 4, characterized in that: The bearing seat is composed of an upper semicircular part and a lower semicircular part which are arranged opposite to each other, and the bearing is a bearing composed of two semicircular structures.

6. The pipe shrinking device for VC heat pipe according to claim 4, characterized in that: An adjusting nut is respectively arranged on the two threaded rods and located on the upper and lower sides of the corresponding support plates.

7. The VC heat pipe constriction device according to claim 1, characterized in that: The friction heating block is made of high temperature resistant metal.

8. The pipe shrinking device for VC heat pipe according to claim 1, characterized in that: The extrusion mechanism includes an extrusion support seat arranged on the pedestal and an electrically controlled telescopic cylinder arranged on the extrusion support seat along the axial direction of the VC heat pipe to be processed, and an extrusion block is arranged at the head of the telescopic rod of the electrically controlled telescopic cylinder; the extrusion block is cylindrical, and its diameter is larger than the outer diameter of the VC heat pipe to be processed.

9. A processing method for a VC heat pipe shrinking device according to any one of claims 1 to 8, used to form a thickened shrinking starting point of a VC heat pipe to be processed before the shrinking operation, characterized in that: The following steps are involved: Clamp one end of the VC heat pipe to be processed on the clamping mechanism, and use the clamping mechanism to drive the VC heat pipe to be processed to rotate; The friction heating block of the mobile processing mechanism is brought into line contact with the friction heating portion of the other end of the VC heat pipe to be processed, and then the rotating friction heating portion is frictionally heated; the friction heating portion is the starting point of the shrinkage processing of the VC heat pipe to be processed plus a margin before the starting point, and the length of the margin is determined according to the thickness and diameter of the VC heat pipe to be processed; When the friction heating part of the VC heat pipe to be processed is heated to a molten state, the extrusion mechanism axially extrude the other end of the rotating VC heat pipe to be processed, and the friction heating block continues to maintain line contact with the outer wall of the VC heat pipe during the axial extrusion, so that the friction heating part is stacked and thickened toward the inside of the VC heat pipe, and the friction heating part re-forms the starting point of the tube shrinkage processing after reducing the excess length.

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