Fixing device for fettling hard alloy tubular blank

Abstract

The invention relates to the technical field of fettling of tubular workpieces, in particular to a fixing device for fettling of a hard alloy tubular blank. The invention discloses tubular workpiece inside and outside fast chamfering equipment which comprises a center supporting seat and at least three transverse main supporting rods, the at least three main supporting rods are distributed around the center supporting seat in the circumferential direction at equal intervals, the inner end of each supporting rod is hinged to the center supporting seat, the outer end of each supporting rod is universally connected with a friction block, and the friction block is connected with the center supporting seat. Each main supporting rod is provided with an auxiliary supporting rod, one end of each auxiliary supporting rod is hinged to the center supporting base, the other end of each auxiliary supporting rod is hinged to the corresponding main supporting rod, and the hinged positions of the auxiliary supporting rods and the main supporting rods are transversely adjustable. The method has the advantages that obvious stress concentration on the pipe wall can be prevented, and the integrity and the service life of the hard alloy tubular blank are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tubular workpiece repairing, in particular to a fixing device for repairing a cemented carbide tubular blank. Background Art

[0002] Cemented carbide pipe fittings are an alloy material made of hard compounds of refractory metals (such as tungsten carbide, titanium carbide, etc.) and binder metals (such as cobalt, nickel, etc.). The preparation process requires powder mixing, pressing, blanking, wax removal, sintering, metalworking and other steps. Cemented carbide tubular blanks are easy to be cracked by clamping tools due to their thin walls and poor structural strength. In order to avoid cracking the cemented carbide tubular blanks, the clamping tools cannot clamp them, causing the cemented carbide tubular blanks to move during the blanking process. Therefore, in the existing cemented carbide pipe manufacturing process, the blanking stage is usually skipped or only light turning is performed. After sintering, the strength of the rough cemented carbide pipe is improved, and the cemented carbide pipe is processed in the subsequent metalworking stage. However, since the blanking stage of the cemented carbide tubular blank is skipped, the amount of metalworking processing increases, and the material turned in the metalworking stage cannot be processed again compared with the material repaired in the blanking stage, and can only be processed by selling scrap cuttings, which leads to an increase in processing costs.

[0003] A Chinese patent with application number 202211694061.3 discloses a support tooling for internal support of cylindrical parts, including a center block, a support rod assembly and a tightening assembly; the center block includes multiple rotating parts, each rotating part is connected to one end of a supporting structure; the dispersion angle of adjacent supporting structure members is adjusted by adjusting the rotating part; the support rod assembly includes multiple rod-shaped supporting structures, one end of the multiple supporting structures is connected to the center block, and the multiple supporting structures are distributed divergently with the center block as the center; the tightening assembly includes a top block for tightening the inner wall of the cylindrical structure, and the top block is connected to the other end of the supporting structure.

[0004] In the above technical solution, the supporting tooling is applied inside the cylindrical structure to provide certain support to the inner wall of the cylindrical structure. However, since the supporting structures in the above technical solution are located in the same plane, the fixed support of the inner wall of the cylindrical structure at one end far away from each other can only be at least three points located at the same height. When the cylindrical wall is thin, the at least three points located at the same height cause significant stress concentration in the local area of ​​the inner wall of the cylindrical structure. For a long time or under high-load conditions, this stress concentration may cause fatigue of the cylindrical wall material, and then cause cracks or even ruptures, seriously affecting the integrity and service life of the cylindrical structure. Therefore, the supporting tooling in the above technical solution cannot be used to support and fix the cemented carbide tubular blank inside, resulting in the cemented carbide tubular blank still needing to be processed in the metalworking stage after sintering, thereby increasing the amount of metalworking processing and increasing the processing cost. Summary of the invention

[0005] The object of the present invention is to provide a fixing device for repairing a hard alloy tubular blank which can prevent stress concentration and ensure the integrity and service life of the tubular blank.

[0006] To achieve the above-mentioned purpose, the present invention discloses a fixing device for repairing a cemented carbide tubular blank, comprising a central support seat and at least three transverse main support rods, wherein the at least three main support rods are circumferentially evenly distributed around the central support seat, the inner end of each support rod is hinged to the central support seat, the outer end of each support rod is universally connected with a friction block, each main support rod is equipped with an auxiliary support rod, one end of the auxiliary support rod is hinged to the central support seat, the other end of the auxiliary support rod is hinged to the main support rod, and the hinge position of the auxiliary support rod and the main support rod is laterally adjustable.

[0007] When the cemented carbide tubular blank needs to be fixed, the center support seat is first fixed at the processing station of the vertical lathe and placed on the inner side of the cemented carbide tubular blank, so that the main support rod is swung to the point where the inner wall of the cemented carbide tubular blank needs to be supported through the hinge point between the main support rod and the center support seat, so that the main support rod is located at at least three points at different heights to support the inner wall of the cemented carbide tubular blank, and then the auxiliary support rod is swung to the state of supporting the main support rod through the hinge point between the auxiliary support rod and the center support seat, and the blank can be repaired after the main support rod fixes the cemented carbide tubular blank.

[0008] The present invention arranges at least three hinged main support rods on the outer side of the central support seat, and supports the main support rods one by one through auxiliary support rods, so that the main support rods support the inner wall of the cemented carbide tubular blank from areas at different heights, avoiding significant stress concentration on the tube wall when the tube wall is thin, causing fatigue of the tube wall material, and then causing cracks or even rupture of the cemented carbide tubular blank, which seriously affects the integrity and service life of the cemented carbide tubular blank.

[0009] The auxiliary support rod can support the main support rod, wherein the clamp at the connection between the auxiliary support rod and the main support rod can select any existing relatively sliding structure, such as a matching slider and slide rail, a swing arm with a limiting hole and a support rod passing through the limiting hole, a support arm fork and a support rod clamped and fixed by bolts, etc.; one side end face of the friction plate at the connection with the inner wall of the cemented carbide tubular blank can be an arc surface, a spherical surface or a plane surface. By making the matching friction plate abut against the inner wall of the cemented carbide tubular blank, the contact area with the inner wall of the cemented carbide tubular blank can be increased, thereby reducing the local pressure on the inner wall of the cemented carbide tubular blank.

[0010] Preferably, the main support rod is provided with at least three transversely spaced through holes, and the auxiliary support rod is hinged to the main support rod through the through holes.

[0011] By providing at least three transversely spaced through holes, the hinge position between the auxiliary support rod and the main support rod can be adjusted transversely.

[0012] Preferably, the friction block is connected to the main support rod via a universal joint.

[0013] Compared with the method of directly fixing the friction plate to the main support rod, the tightness of the contact between the friction plate and the inner wall of the cemented carbide tubular blank can be improved.

[0014] Preferably, the main support rod is provided with an adjustment section for matching with the auxiliary support rod and a telescopic section for changing its own length in sequence along a direction away from the center line of the central structure.

[0015] By means of the adjustment section and the telescopic section arranged on the main support rod, the main support rod can still adaptively contact and tighten the inner wall of the cemented carbide tubular blank after changing the angle between the main support rod and the central support seat, thereby ensuring the adaptability of the device when in use.

[0016] Preferably, the through hole is arranged on the adjusting section, a positioning hole is opened at the hinge position of the auxiliary support rod and the main support rod, the positioning hole is matched with the through hole, and the through hole and the positioning hole are matched with fixing parts.

[0017] Through the fixing piece used in combination with the through hole and the positioning hole, after the main support rod determines the inclination angle, the positioning hole of the auxiliary support rod is aligned with the corresponding through hole, and then the main support rod and the auxiliary support rod are clamped by the fixing piece.

[0018] Preferably, the telescopic section is provided with a sleeve that can slide relatively along the telescopic section, and a first locking member is provided between the sleeve and the telescopic section, and the first locking member is used to limit the stroke length of the sleeve on the outer circumferential surface of the telescopic section.

[0019] When the first locking member is fixed on the telescopic section, the sliding travel of the sleeve on the outer circumferential surface of the telescopic section is limited. At this time, the supporting force of the first locking member on the sleeve is the supporting force of the sleeve on the inner wall of the cemented carbide tubular blank.

[0020] Among them, any existing structure that can realize relative reciprocating movement between the two sleeves can be set between the kit and the telescopic section to provide support force for the inner wall of the cemented carbide tubular blank, such as a pressure spring, an air spring, a locking nut, a positioning pin, etc.

[0021] Preferably, an extension portion is provided at one end of the adjustment section away from the central support seat, the telescopic section is fixed on the extension portion, and a cross-section of the extension portion along the axial direction of the telescopic section is larger than an axial cross-section of the telescopic section.

[0022] By increasing the surface area at the end point of the adjusting section, the contact area between the telescopic section and the adjusting section is increased, thereby ensuring the stability of the connection between the two.

[0023] Preferably, a screw rod is provided through the central support seat.

[0024] The center support seat can move along the outer surface of the screw rod, wherein the center support seat and the outer surface of the screw rod can be connected by threads or only achieve relative sliding and then be limited by a workpiece that can be threadedly connected to the screw rod and suspended at any height of the screw rod, thereby achieving its own height adjustment.

[0025] Preferably, the outer cylindrical surface of the screw rod is sleeved with a second locking piece for supporting the column, and the second locking piece can limit the height position of the central support seat.

[0026] When the second locking member is fixedly stopped on the screw rod, the central support seat is supported against the gravity thereof.

[0027] Preferably, the strong magnetic dial is fixedly provided at one axial end of the screw rod, and the strong magnetic dial is used to adsorb to the processing station of the vertical lathe.

[0028] The device is fixed on the vertical lathe processing station through a strong magnetic dial. When the strong magnetic dial is started, the device and the vertical lathe processing station can be fixed. When the strong magnetic dial is turned off, the device and the vertical lathe processing station can be unlocked.

[0029] The present invention can support the cemented carbide tubular blank from areas of different heights on the inner wall thereof, thereby avoiding significant stress concentration on the tube wall when the tube wall is thin, causing fatigue of the tube wall material, and further causing cracks or even rupture of the cemented carbide tubular blank, and has the advantage of ensuring the integrity and service life of the cemented carbide tubular blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A structural schematic diagram of the present invention.

[0031] Figure 2 A structural schematic diagram of another aspect of the present invention.

[0032] Figure 3 It is a structural schematic diagram of the second supporting structure of the present invention.

[0033] In the figure: 11, strong magnetic dial; 12, screw rod; 13, center support seat; 14, first support rod; 15, through hole; 16, support beam; 17, positioning hole; 20, second support rod; 21, support sleeve; 22, universal joint; 23, friction plate; 24, first nut; 25, second nut. DETAILED DESCRIPTION

[0034] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0035] Depend on Figure 1 , Figure 2 As shown, this embodiment discloses a fixing device for repairing a cemented carbide tubular blank, comprising a central support seat located inside a pipe, at least three main support rods arranged on the central support seat, one end of the main support rod is hinged to the central support seat, and a second support structure is arranged between the main support rod and the central support seat, the second support structure is a support beam 16 obliquely spanning the central support seat and the lower side of the main support rod, Figure 3 As shown, one end of the support beam 16 is hinged to the central support seat, and the other end of the support beam 16 is connected to the main support rod. The end of the support beam 16 close to the main support rod is provided with a groove that matches the cross-section of the main support rod, and the groove is perpendicular to the swinging direction. Both sides are provided with penetrating positioning holes 17, and the hinge between the main support rod and the central support seat and the hinge between the support beam 16 and the central support seat are also provided with the same positioning holes 17.

[0036] The main support rod includes an adjustment section for matching with the support beam 16 and a telescopic section for changing its own length. The adjustment section includes a first support rod 14, at least three through holes 15 opened along the length direction of the first support rod 14 and a fixing member used in conjunction with the through holes 15. The telescopic section includes a second support rod 20 fixedly arranged at one end of the first support rod 14 away from the central support seat, a support sleeve 21 sleeved on the second support rod 20 and capable of relative sliding along the second support rod 20. An extension portion is provided at one end of the first support rod 14 away from the central support seat, and the second support rod 20 is fixedly arranged on the extension portion. The cross-section of the extension portion along the axial direction of the second support rod 20 is larger than the axial cross-section of the second support rod 20.

[0037] The end of the support sleeve 21 away from the center support seat is connected to a friction plate 23 through a universal joint 22. The end face of the friction plate 23 on the side in contact with the inner wall of the pipe is an arc surface, thereby increasing the contact area with the inner wall of the pipe. The through hole 15 matches the aperture of the positioning hole 17. The fixing piece is a locking bolt. The locking bolt is used to clamp the first support rod 14 and the center support seat, the second support rod 20 and the center support seat through the positioning hole 17, and the first support rod 14 and the second support rod 20 through the through hole 15 and the positioning hole 17. A first locking piece is provided between the support sleeve and the second support rod 20. The first locking piece is a first nut 24. The first nut 24 is threadedly connected to the outer cylindrical surface of the second support rod 20. The first nut 24 is used to limit the stroke length of the support sleeve 21 on the outer cylindrical surface of the second support rod 20.

[0038] Depend on Figure 2 As shown, the center support seat 13 is used to be connected to the first support rod 14, and a screw rod 12 passes through the axis of the center support seat 13. A strong magnetic dial 11 for adsorbing to the vertical lathe processing station is fixed at one axial end of the screw rod 12. The outer cylindrical surface of the screw rod 12 is sleeved with a second locking piece for supporting the center support seat. The second locking piece is a second nut 25. The second nut 25 can limit the height position of the center support seat 13.

[0039] When it is necessary to fix the pipe fitting, first place the strong magnetic dial 11 on the inner side of the pipe fitting and fix it to the center of the processing station of the vertical lathe by magnetic force, manually rotate the second nut 25, so as to adjust the height of the center support seat 13 through the second nut 25, and then preliminarily adjust the height of the first support rod 14, and then swing the first support rod 14 to correspond according to the point where the inner wall of the pipe fitting needs to be supported, fix the inclination angle of the first support rod 14 by the locking bolt, and then adjust the inclination angle of the second support rod 20 according to the through hole 15 in the first support rod 14, and fix the inclination angle of the second support rod 20 and the angle between the first support rod 14 and the second support rod 20 by the locking bolt. At this time, manually rotate the first nut 24, and the first nut 24 limits the stroke of the support sleeve 21 on the outer cylindrical surface of the second support rod 20, and uses the friction plate 23 located at the end point of the support sleeve 21 to support the inner wall of the pipe fitting, and realizes the adaptive adjustment of the friction plate 23 through the universal joint 22, and finally performs the blank repair.

Claims

1. A fixing device for repairing a cemented carbide tubular blank, characterized in that: It includes a central support seat and at least three transverse main support rods, wherein the at least three main support rods are circumferentially evenly distributed around the central support seat, the inner end of each support rod is hinged to the central support seat, the outer end of each support rod is universally connected with a friction block, and each main support rod is equipped with an auxiliary support rod, one end of the auxiliary support rod is hinged to the central support seat, and the other end of the auxiliary support rod is hinged to the main support rod, and the hinge position of the auxiliary support rod and the main support rod is laterally adjustable.

2. The fixing device for repairing a cemented carbide blank according to claim 1, characterized in that: The main support rod is provided with at least three transversely spaced through holes, and the auxiliary support rod is hinged to the main support rod through the through holes.

3. A fixing device for pipe blank repair according to claim 2, characterized in that: The friction block is connected to the main support rod via a universal joint.

4. A fixing device for pipe blank repair according to claim 1, characterized in that: The main support rod is provided with an adjustment section for matching with the auxiliary support rod and a telescopic section for changing its own length in sequence along a direction away from the center line of the central structure.

5. A fixing device for pipe blank repair according to claim 4, characterized in that: The through hole is arranged on the adjusting section, and a positioning hole is opened at the hinge position of the auxiliary support rod and the main support rod, the positioning hole is matched with the through hole, and the through hole and the positioning hole are matched with fixing parts.

6. A fixing device for pipe blank repair according to claim 4, characterized in that: The telescopic section is sleeved with a sleeve capable of relatively sliding along the telescopic section, and a first locking member is provided between the sleeve and the telescopic section, and the first locking member is used to limit the stroke length of the sleeve on the outer circumferential surface of the telescopic section.

7. A fixing device for pipe blank repair according to claim 4, 5 or 6, characterized in that: An extension portion is provided at one end of the adjustment section away from the central structure, the telescopic section is fixed on the extension portion, and a cross section of the extension portion along the axial direction of the telescopic section is larger than an axial cross section of the telescopic section.

8. A fixing device for pipe blank repair according to claim 1, characterized in that: A screw rod is penetrated through the central support seat.

9. A fixing device for pipe blank repair according to claim 8, characterized in that: The outer circumferential surface of the screw rod is sleeved with a second locking piece for supporting the column, and the second locking piece can limit the height position of the central support seat.

10. A fixing device for pipe blank repair according to claim 8, characterized in that: A strong magnetic dial is fixedly provided at one axial end of the screw rod, and the strong magnetic dial is used for adsorbing to the processing station of the vertical lathe.

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