Pipeline necking device for VC heat pipe and machining method

Abstract

The invention relates to the field of metal pipe machining, and provides a pipe necking device for a VC heat pipe and a machining method.The clamping mechanism of the pipe necking device is arranged at one end of a pedestal and used for clamping one end of the VC heat pipe to be machined and driving the VC heat pipe to rotate; the movable machining mechanism is arranged on one side of the other end of the VC heat pipe to be machined in the direction parallel to the VC heat pipe to be machined and provided with a friction heating block capable of conducting friction heating on the other end of the VC heat pipe before extrusion and maintaining contact during extrusion. The friction heating block can be in linear contact with the outer wall of the VC heat pipe to be machined; the extruding mechanism is arranged at the other end of the pedestal in the axis direction of the VC heat pipe to be machined and used for axially extruding the other end of the VC heat pipe to be machined. According to the method, the pipe shrinkage machining starting position with the thickened pipe wall can be formed, the thick pipe wall is thinned again after necking operation, but the thick pipe wall is almost consistent with the pipe walls of other parts, and therefore the stress of the machining position is reduced, and the dangerous section is avoided.

Description

Technical Field

[0001] The invention relates to the field of metal pipe processing, and in particular to a pipe shrinking device for a VC heat pipe and a processing method. Background Art

[0002] VC heat pipe (Vapor Chamber) is a highly efficient heat conduction element. Its principle is to use the water in the chamber to change from liquid to gas to absorb heat. When the gas touches the area with lower temperature, it condenses into liquid and releases heat. The liquid flows back to the heating area through the capillary structure (liquid wick) in the chamber, and the cycle repeats to take away the heat generated by the heating part and dissipate it.

[0003] When sealing the VC heat pipe and joining round tubes of different diameters, a pipe shrinking machine is required to shrink the pipe. Spinning and shrinking pipe technology is a commonly used pipe shrinking technology. Its principle is: use a clamping mechanism to clamp one end of the metal round tube and drive it to rotate, and use a flame to heat the other end of the metal round tube. When the head of the metal round tube is heated to a molten state, use a forming mold to rush the heated metal round tube head until it reaches the required shape. The force points of the metal round tube change from point to line and from line to surface. At the same time, a certain pressure is applied in a certain direction, so that the round tube deforms and flows along this direction to form a certain shape.

[0004] After the shrinking operation is completed, the original metal round tube with the same diameter forms the original diameter round tube part, the connecting transition part and the shrinking diameter round tube part connected in sequence, wherein the connecting transition part can also be called the neck, which is the starting point of the shrinking process corresponding to the original diameter metal round tube. Since the above shrinking operation is completed by forcibly squeezing the metal round tube, the tube wall of the neck will become thinner, and the neck will be subjected to great stress, becoming a dangerous section and affecting the strength of the workpiece. Summary of the invention

[0005] Based on this, it is necessary to provide a pipe shrinking device and processing method for VC heat pipes to address the problems existing in the current spiral shrinking technology, so as to avoid the neck becoming a dangerous section after the shrinking operation.

[0006] The above purpose is achieved through the following technical solutions: The present invention provides a pipe shrinking device for a VC heat pipe, comprising a pedestal and a clamping mechanism, wherein 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; the device also comprises a moving processing mechanism and an extrusion mechanism; the moving processing mechanism is arranged at 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 friction heating block has a head capable of performing 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 to be processed after friction heating.

[0007] In one embodiment, the clamping mechanism includes a motor disposed on the base and a chuck mounted on a rotating shaft of the motor.

[0008] In one of the embodiments, an assisting clamp is provided on the base and between the clamping mechanism and the mobile processing mechanism, and the assisting clamp is used to assist in clamping the VC heat pipe to be processed.

[0009] In one of the embodiments, 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.

[0010] In one of the embodiments, the bearing seat is composed of an upper semicircular portion and a lower semicircular portion that are arranged opposite to each other, and the bearing is a bearing composed of two semicircular structures.

[0011] In one of the embodiments, an adjusting nut is respectively disposed on the two threaded rods and located on the upper and lower sides of the corresponding support plate.

[0012] In one of the embodiments, the mobile processing mechanism includes a lower feed seat slidably arranged on the base 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.

[0013] In one of the embodiments, the friction heating block is made of high temperature resistant metal.

[0014] In one of the embodiments, the extrusion mechanism includes an extrusion support seat arranged on the base 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.

[0015] The present invention also provides a processing method based on the above-mentioned VC heat pipe pipe shrinking device, which is used to form a thickened shrinking processing starting point of the VC heat pipe to be processed before the shrinking operation, comprising the following steps: 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.

[0016] The beneficial effects of the present invention are: The present invention provides a pipe shrinking device and processing method for a VC heat pipe, wherein a clamping mechanism in the shrinking device is arranged at one end of a pedestal, used for clamping one end of the VC heat pipe to be processed and driving the VC heat pipe to rotate; a 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, and the friction heating block has a head capable of performing line contact with the outer wall of the VC heat pipe to be processed; an extrusion mechanism is arranged on 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 that before the traditional shrinking operation, the original shrinking processing starting point plus a section of excess before the point is heated and compressed to form the shrinking processing starting point where the tube wall is folded and thickened, and then the shrinking operation is performed on this basis, so that this part of the thicker tube wall becomes thinner again after the shrinking operation, but is almost consistent with the tube wall in other parts, thereby reducing the stress at the processing point, avoiding the appearance of dangerous sections, and ensuring the quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the pipe shrinking device for VC heat pipe; Figure 2 for Figure 1 Front view of Figure 3 for Figure 1 A top view of Figure 4 To assist the structural diagram of the fixture; Figure 5 This is a cross-sectional view of the VC heat pipe after preliminary processing; Figure 6 It is a schematic diagram of the stresses to which the VC heat pipe is subjected during the shrinking operation in the prior art; Figure 7 It is a schematic diagram of the stress to which the VC heat pipe in the present invention is subjected during the shrinking operation.

[0018] in: 101. Base; 102. Motor; 103. Chuck; 104. Assisting fixture; 105. Mobile processing mechanism; 106. Compression pile; 200. VC heat pipe to be processed; 201. VC heat pipe after compression; 1041. Bearing seat; 1042. Bearing; 1043. Threaded rod; 1044. Adjusting nut. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which 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.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] like Figure 1-3 As shown, the present invention provides a pipe shrinking device for a VC heat pipe, comprising a pedestal 101, a clamping mechanism, a mobile processing mechanism 105 and an extrusion mechanism 106. The clamping mechanism is arranged at one end of the pedestal 101, and is used to clamp one end of the VC heat pipe 200 to be processed and can drive the VC heat pipe to rotate; the mobile 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 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 200 to be processed; the extrusion mechanism 106 is arranged on the other end of the pedestal 101 along the axial direction of the VC heat pipe 200 to be processed, and is used to axially extrude the other end of the VC heat pipe 200 to be processed after friction heating.

[0023] When the device is in use, the friction heating block moves to the friction heating part of the VC heat pipe 200 to be processed. The friction heating part is the starting point of the shrinkage processing of the VC heat pipe 200 to be processed plus a section of surplus before that point, and the length of the surplus is determined according to the thickness and caliber of the VC heat pipe 200 to be processed. The friction heating block is made of high temperature resistant metal. The friction heating block maintains line contact with the friction heating part. As the VC heat pipe 200 to be processed continues to rotate, the friction heating part will be heated to a molten state by friction; then the extrusion mechanism 106 axially extrude the other end of the VC heat pipe 200 to be processed, so that the friction heating part in the molten state is stacked and thickened inside the VC heat pipe, and finally the friction heating part reduces the length of the surplus and re-forms the starting point of the shrinkage processing. And in the above-mentioned axial extrusion process, the VC heat pipe 200 to be processed is in a rotating state, and the friction heating block and the friction heating part always maintain a line contact state to ensure that the friction heating part can be stacked inside the VC heat pipe.

[0024] The clamping mechanism includes a motor 102 disposed on a base 101 and a chuck 103 mounted on a rotating shaft of the motor 102. The motor 102 is used to drive the chuck 103 to rotate, and one end of the VC heat pipe 200 to be processed is clamped by the chuck 103, and the VC heat pipe 200 to be processed can rotate with the chuck 103.

[0025] An assisting fixture 104 is provided on the pedestal 101 and between the clamping mechanism and the mobile processing mechanism 105. The assisting fixture 104 is used to assist in clamping the VC heat pipe 200 to be processed. The assisting fixture 104 does not affect the rotation of the VC heat pipe 200 to be processed. The assisting fixture 104 is provided at a position corresponding to the middle part of the VC heat pipe 200 to be processed, and is used to assist in supporting the VC heat pipe 200 to be processed, so as to ensure that the device can process a VC heat pipe 200 to be processed with a larger length.

[0026] like Figure 4 As 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 VC heat pipe 200 to be processed, and a support plate is respectively arranged at both ends 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 VC heat pipe 200 to be processed is inserted into the inner ring of the bearing 1042. An adjusting nut 1044 is respectively arranged on the upper and lower sides of the corresponding support plate on the two threaded rods 1043, loosen the adjusting nut 1044, adjust the height of the bearing seat 1041 to a suitable level according to the size of the VC heat pipe 200 to be processed, and then tighten the adjusting nut 1044.

[0027] The bearing seat 1041 is composed of an upper semicircular portion and a lower semicircular portion that are arranged opposite to each other, and the bearing 1042 is a bearing composed of two semicircular structures, so that the bearing seat 1041 and the bearing 1042 can be easily disassembled and the VC heat pipe 200 to be processed can be installed.

[0028] The mobile processing mechanism 105 includes a lower feed seat slidably arranged on the pedestal 101 in a direction parallel to the VC heat pipe 200 to be processed and an upper feed seat slidably arranged on the lower feed seat in a direction perpendicular to the direction, and a 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 using a screw nut mechanism in the prior art, and the upper feed seat can also be installed on the lower feed seat using a screw nut mechanism in the prior art. When the device is used for processing, the mobile processing mechanism 105 is first moved as a whole to a position flush with the friction heating portion of the VC heat pipe 200 to be processed, and then the upper feed seat is moved close to the friction heating portion until the friction heating block is in linear contact with the friction heating portion.

[0029] The extrusion mechanism 106 includes an extrusion support seat fixedly arranged on the pedestal 101 and an electrically controlled telescopic cylinder arranged on the extrusion support seat along the axial direction of the VC heat pipe 200 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. The cylindrical extrusion block is facing 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 extrusion of the VC heat pipe 200 to be processed.

[0030] The present invention also provides a processing method based on the above-mentioned VC heat pipe pipe shrinking device, which is used for performing preliminary processing on the VC heat pipe 200 to be processed before the shrinking operation to form a thickened shrinking processing starting point, comprising the following steps: Clamp one end of the VC heat pipe 200 to be processed on the clamping mechanism, and use the clamping mechanism to drive the VC heat pipe 200 to be processed to rotate; The friction heating block of the mobile processing mechanism 105 is brought into line contact with the friction heating portion of the other end of the VC heat pipe 200 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 200 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 200 to be processed; When the friction heating portion of the VC heat pipe 200 to be processed is heated to a molten state, the extrusion mechanism 106 axially extrude the other end of the rotating VC heat pipe 200 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 portion is stacked and thickened toward the inside of the VC heat pipe, and the friction heating portion is reduced in length to reform the starting point of the tube shrinkage processing.

[0031] After the initial treatment, the VC heat pipe is as follows Figure 5 As shown. Then, the mobile processing mechanism 105 is continuously adjusted to perform subsequent shrinking operation on the compressed VC heat pipe 201. This process is the same as the prior art. However, after the shrinking operation is performed at the beginning of the thickened shrinking process, the corresponding tube wall becomes thinner again, but the tube wall of the formed neck (or connecting transition part) is almost the same as the tube wall thickness of other parts, thereby reducing the stress at the processing site, avoiding the appearance of dangerous sections, and ensuring the quality of the workpiece.

[0032] The length of the margin is determined according to the thickness and diameter of the VC heat pipe 200 to be processed. The thicker the thickness (tube 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; and the greater the diameter change before and after the shrinking operation, the more serious the deformation of the tube wall at the beginning of the shrinking process, and the larger the corresponding margin length should be.

[0033] Figure 6It is a schematic diagram of the stresses to which a VC heat pipe which has not been processed by the method of the present invention is subjected during the shrinking operation in the prior art; Figure 7 The figure is a schematic diagram of the stresses to which a VC heat pipe having the same other properties as those processed by the method of the present invention is subjected during the shrinking operation. By comparison, it can be clearly seen that the stress at the processing portion of the latter is smaller, which can serve as the research and development proof and theoretical basis of the present invention.

[0034] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A pipe shrinking device for a VC heat pipe, comprising a base (101) and a clamping mechanism, wherein the clamping mechanism is arranged at one end of the base (101) and is used to clamp one end of a VC heat pipe (200) to be processed and can drive the VC heat pipe to rotate; characterized in that: The invention also comprises a movable processing mechanism (105) and an extrusion mechanism (106); the movable 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 capable of making linear contact with the outer wall of the VC heat pipe (200) to be processed; the extrusion mechanism (106) is arranged on the other end of 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.

2. The VC heat pipe constriction device according to claim 1, characterized in that: The clamping mechanism comprises a motor (102) arranged on the pedestal (101) and a chuck (103) mounted on the rotating shaft of the motor (102).

3. The VC heat pipe constriction device according to claim 1, characterized in that: An assisting clamp (104) is provided on the pedestal (101) and between the clamping mechanism and the moving processing mechanism (105); the assisting clamp (104) is used to assist in clamping the VC heat pipe (200) to be processed.

4. The pipe shrinking device for VC heat pipe according to claim 3, characterized in that: The assisting fixture (104) comprises a bearing seat (1041), a bearing (1042) and two threaded rods (1043); the two threaded rods (1043) are respectively vertically arranged on both sides of the VC heat pipe (200) to be processed, and a support plate is respectively arranged at both ends 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).

5. The pipe shrinking device for VC heat pipe according to claim 4, characterized in that: The bearing seat (1041) is composed of an upper semicircular portion and a lower semicircular portion which are arranged opposite to each other, and the bearing (1042) 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 (1044) is respectively arranged on the two threaded rods (1043) and located on the upper and lower sides of the corresponding support plate.

7. The pipe shrinking device for VC heat pipe according to claim 1, characterized in that: The mobile processing mechanism (105) comprises a lower feed seat slidably arranged on the pedestal (101) in a direction parallel to the VC heat pipe (200) to be processed, and an upper feed seat slidably arranged on the lower feed seat in a direction perpendicular to the direction, and the friction heating block is arranged at an end of the upper feed seat close to the VC heat pipe (200) to be processed.

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

9. The pipe shrinking device for VC heat pipe according to claim 1, characterized in that: The extrusion mechanism (106) comprises an extrusion support seat arranged on the pedestal (101) and an electrically controlled telescopic cylinder arranged on the extrusion support seat along the axial direction of the VC heat pipe (200) to be processed, wherein the head of the telescopic rod of the electrically controlled telescopic cylinder is provided with an extrusion block; the extrusion block is cylindrical, and its diameter is larger than the outer diameter of the VC heat pipe (200) to be processed.

10. A processing method for a VC heat pipe shrinking device according to any one of claims 1 to 9, used for forming a thickened shrinking starting point of a VC heat pipe (200) to be processed before shrinking, characterized in that: The following steps are involved: Clamping one end of the VC heat pipe (200) to be processed on the clamping mechanism, and using the clamping mechanism to drive the VC heat pipe (200) to be processed to rotate; The friction heating block of the mobile processing mechanism (105) is brought into line contact with the friction heating portion at the other end of the VC heat pipe (200) 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 (200) 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 (200) to be processed; When the friction heating portion of the VC heat pipe (200) to be processed is heated to a molten state, the extrusion mechanism (106) axially extrude the other end of the rotating VC heat pipe (200) to be processed, and during 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 portion is stacked and thickened toward the inside of the VC heat pipe, and the friction heating portion is reduced in length to re-form the starting point of the tube shrinkage processing.

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