A manual post-weld separation device for friction welding

Abstract

A manual post-weld separation device for friction welding, wherein the relative positioning surfaces of the left and right holding rings are arc surfaces that match the welding tooling, the lower ends of the left and right holding rings are fixedly connected with a flat plate, and the flat plate is provided with a plurality of guide columns that match the light holes on the welding tooling for positioning, the flat plate at the bottom of the left holding ring is fixed to one side of the base, and the flat plate at the bottom of the right holding ring and the right holding ring are connected to form a whole that can move away from and close to the left holding ring with the transverse movement of the driving device; the right and left holding rings are respectively provided with a symmetrical through hole, and the through hole aperture is larger than the aperture of the positioning pin hole on the welding tooling, and the separation device also includes an ejection device that can move along the through hole on the right and left holding rings to eject the pin shaft of the welding tooling; a groove is provided on the base, and a plurality of steel balls are laid flat in the groove, and one end of the groove is flush with the right end surface of the plane at the bottom of the left holding ring, and the depth of the groove is equal to the ball diameter of the steel ball. The tooling and the workpiece can be quickly separated, the work efficiency is improved, and the coaxiality of the workpiece is effectively guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a manual post-weld separation device for friction welding. Background Art

[0002] At present, when the rod head and the rod body are friction welded, due to the unique welding method of friction welding, a special welding tool is required (see the attached figure). Since the coaxiality requirement of the piston rod head and the rod body is very high, if the position of the rod head is controlled by the clamping force of the left and right halves of the welding tool, it is easy to be misaligned, resulting in a large coaxiality error between the rod head and the rod body. Therefore, a pin is needed to achieve accurate positioning of the rod head, wherein the pin is connected to the piston rod head to be welded and the welding tool through a small interference fit, and since the length of the pin is smaller than the diameter of the left half of the welding tool, the pin is completely sunk into the welding tool.

[0003] During friction welding, the welding temperature is as high as 1000℃. After welding, if the piston rod is not separated from the welding tooling in time, the piston rod can only remain in an inclined state under the restriction of the welding tooling (see Figure 7 As shown in the figure) (Since the piston rod is slender, it is easy to fall over when placed vertically, and the piston rod is in a high temperature state after welding. After falling over, it will roll, which is easy to cause safety hazards, so it cannot be placed vertically. Even if a tooling is used to ensure that the piston rod remains vertical, the piston rod is hot and slender. Placing the piston rod in a vertical tooling will increase the difficulty of operation, reduce work efficiency and productivity, and increase tooling costs). At this time, since the temperature of the piston rod is as high as 1000℃, it is very easy to plastically deform at the weld due to its own weight at high temperature, causing the piston rod to bend, reducing the coaxiality of the piston rod head and the rod body, affecting the later use; so if you want to avoid such a situation, it is best to let the welded piston rod cool down by itself in a horizontal state (see Figure 8 As shown); Therefore, the technical difficulty is how to smoothly remove the interference-connected pin from the welding tooling under the high temperature state of the piston rod, so as to separate the high-temperature piston rod, the welding tooling and the pin. If it is knocked by brute force, since the pin is respectively connected with the left and right parts of the welding tooling and the rod head by interference, the friction force generated therein is relatively large, and the force required for knocking is also relatively large. When knocking vigorously, a large vibration will be generated, which will drive the vibration of the high-temperature piston rod. The large vibration plus the effect of the gravity of the piston rod will inevitably cause the piston rod to bend to varying degrees, thereby reducing the coaxiality of the piston rod head and the rod body. This patent solves this problem, allowing the piston rod to separate the pin from the welding tooling under stable and vertical conditions. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art, thereby providing a manual post-weld separation device for friction welding, which can quickly separate the tooling and the workpiece, improve work efficiency, and effectively ensure the coaxiality of the workpiece.

[0005] The technical scheme of the present invention is: a manual post-weld separation device for friction welding, comprising a left embrace ring and a right embrace ring for positioning a welding tool and a piston rod after welding, the relative positioning surfaces of the left embrace ring and the right embrace ring are arc surfaces matched with the welding tool, the lower ends of the left embrace ring and the right embrace ring are fixedly connected with a flat plate, and the flat plate is provided with a plurality of guide columns matched with the light holes on the welding tool for positioning, the flat plate at the bottom of the left embrace ring is fixed on one side of the base, and the flat plate at the bottom of the right embrace ring and the right embrace ring are connected to form an integral body which can move away from and close to the left embrace ring with the transverse movement of the driving device; the right embrace ring and the left embrace ring are respectively provided with a symmetrical through hole, the through hole is coaxially arranged with the positioning pin hole on the welding tool, the aperture of the through hole is larger than the aperture of the positioning pin hole on the welding tool, and the separation device also includes an ejection device which can eject the pin shaft of the welding tool along the through hole on the right embrace ring and the left embrace ring; a groove is provided on the base, and a plurality of steel balls are laid flat in the groove, one end of the groove is flush with the right end surface of the plane at the bottom of the left embrace ring, and the depth of the groove is equal to the ball diameter of the steel ball.

[0006] The upper ends of the positioning surfaces of the left and right embrace rings are provided with chamfers for guiding.

[0007] The driving device includes a connecting block, a large screw and a supporting block. The connecting block is fixed on the surface opposite to the positioning surface of the right holding ring. The interior of the connecting block is a hollow cavity. The supporting block is fixed on the base. One end of the large screw passes through the threaded hole on the supporting block and the through hole on the connecting block in sequence, and then a large nut is put on the large screw and the connecting block is assembled together. A large handwheel is installed on the other end of the large screw. The through hole on the connecting block and the threaded hole on the supporting block are coaxially arranged.

[0008] The ejection device includes a small screw rod coaxially arranged with the through holes on the right and left holding rings. The small screw rod is assembled in the internal threaded through hole of the large screw rod and is threadedly connected with the internal threaded through hole of the large screw rod. The small screw rod is longer than the large screw rod, and a small hand wheel is installed at one end of the small screw rod.

[0009] The external thread groove of the large screw rod is arranged in the opposite direction to the internal thread groove of the internal thread through hole.

[0010] The connection block and the right holding ring are provided with assembly screw holes at corresponding positions, and are connected into one piece via bolts.

[0011] There are three guide columns on each flat plate. Mounting screw holes are provided on the bottom of the guide columns and the corresponding flat plates, and the guide columns are fixed at corresponding positions of the flat plates by screws.

[0012] The welding tooling comprises a left half and a right half with the same structure. When the left half and the right half are closed, they form a cylindrical table. A positioning hole for positioning the rod head of the piston rod to be welded is provided at the axis center of the cylindrical table. A positioning pin hole for installing a fixing pin shaft is provided on the cylindrical table. The positioning pin hole corresponds to the light hole of the rod head of the piston rod to be welded and extends radially along the cylindrical table.

[0013] The length of the pin shaft used for assembling the welding tool and the piston rod head is smaller than the diameter of the cylindrical table, and the pin shaft and the light hole of the piston rod head to be welded have a small interference fit.

[0014] The bottom of the left half and the bottom of the right half are each provided with three light holes, and each light hole is clearance-matched with a corresponding guide column.

[0015] Compared with the existing technology, the piston rod can be separated from the welding tooling in a timely and smooth manner after welding, ensuring the coaxiality of the piston rod head and the rod body, saving the processing time of the production line, simplifying the post-welding separation process, and realizing the transition from manual separation to automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 is a top view of the present invention;

[0018] Figure 3 is a cross-sectional view of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the left holding ring of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the right holding ring of the present invention;

[0021] Figure 6 It is a schematic diagram of the use process of the welding tool of the present invention;

[0022] Figure 7 It is a schematic diagram of the structure in which the piston rod and the welding tooling are cooled together in an inclined state;

[0023] Figure 8 It is a schematic diagram of the structure of the cooling of the piston rod in a flat state;

[0024] In the figure: 1. left holding ring; 2. bottom plate; 3. bolt; 4. right holding ring; 5. connecting block; 6. large nut; 7. large handwheel; 8. screw; 9. guide column; 10. large screw; 11. supporting block; 12. piston rod head to be welded; 13. piston rod body to be welded; 14. left half; 15. right half; 16. pin; 17. steel ball; 18. small screw; 19. small handwheel. DETAILED DESCRIPTION

[0025] Figure 1 , Figure 2 In the figure, the separation device is composed of a right embrace ring 4, a left embrace ring 1, a driving device, an ejection device and a bottom plate 2. The right embrace ring 4 and the left embrace ring 1 are used to position the welding tooling and the piston rod after welding. The relative positioning surfaces of the left embrace ring 1 and the right embrace ring 4 are arc surfaces that match the welding tooling. The lower ends of the left embrace ring 1 and the right embrace ring 4 are fixedly connected with a flat plate. The flat plate at the bottom of the left embrace ring 1 is welded together with the bottom plate 2. The flat plate at the bottom of the right embrace ring 4 is connected to the right embrace ring 4 as a whole, and the whole can be moved laterally away from and close to the left embrace ring 1 with the driving device; the driving device is composed of a connecting block 5, a large screw 10, a large hand wheel 7, a large nut 6 and a supporting block 11; the ... The connecting block 5 is fixed on the opposite surface of the positioning surface of the right holding ring 4 by bolts 3. The interior of the connecting block 5 is a hollow cavity. One end of the large screw 10 passes through the threaded hole on the supporting block 11 and the through hole on the connecting block 5 in sequence, and then the large nut 6 is put on. The large screw 10 is assembled with the connecting block 5. A large handwheel 7 is installed on the other end of the large screw 10. The through hole on the connecting block 5 is coaxially arranged with the threaded hole on the supporting block 11; the supporting block 11 and the base plate 2 are welded together, and the middle part of the large screw 10 is connected to the supporting block 11 by threads. A symmetrical through hole is respectively opened on the right holding ring 4 and the left holding ring 1. The through hole is coaxially arranged with the positioning pin hole on the welding tooling. The aperture of the through hole is larger than the aperture of the positioning pin hole on the welding tooling. The ejection device can move horizontally along the through hole on the right holding ring 4 and the left holding ring 1 to eject the pin shaft 16 of the welding device. The ejection device includes a small screw 18, which is assembled in the internal thread through hole of the large screw 10 and is threadedly connected with the internal thread through hole of the large screw 10. The length of the small screw 18 is larger than that of the large screw 10, and a small hand wheel 19 is welded at one end of the small screw 18. A groove is provided on the base 2, and a plurality of steel balls 17 are laid flat in the groove, and the steel balls 17 can roll freely in the groove. A plurality of guide columns 9 are provided on the flat plate at the bottom of the right holding ring 4 and the left holding ring 1 to cooperate with the light holes on the welding tooling for positioning. This patent includes a total of 6 guide columns 9, of which the three guide columns 9 on the left are connected to the flat plate at the bottom of the left holding ring 1 through screws 8; the three guide columns 9 on the right are connected to the flat plate at the bottom of the right holding ring 4 through screws 8.

[0026] First, weld the base plate 2 and the supporting block 11 together; then weld the large screw 10 and the large handwheel 7 together; pass the large screw 10 through the threaded hole on the supporting block 11 and the through hole on the connecting block 5 in turn, and then tighten the large nut 6 on the end of the large screw 10, then connect the right ring 4 and the connecting block 5 together through the bolt 3, and finally weld the small screw 18 and the small handwheel 19 together, and screw the small screw 18 into the internal threaded through hole of the large screw 10, and the external thread groove of the large screw 10 is set in the opposite direction to the internal thread groove of the internal threaded through hole.

[0027] Figure 3In the figure, one end of the groove is flush with the right end surface of the plane at the bottom of the left embrace ring 1, and the depth of the groove is equal to the ball diameter of the steel ball 17; the upper ends of the positioning surfaces of the left embrace ring 1 and the right embrace ring 4 are provided with chamfers for guiding.

[0028] Figure 4 It is a structural schematic diagram of the left holding ring of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the right holding ring of the present invention;

[0030] Figure 6 In the figure, the welding tool includes a left half 14 and a right half 15. The left half 14 and the right half 15 have the same structure. When the left half 14 and the right half 15 are closed, they form a cylindrical table. A positioning hole for positioning the piston rod head 12 to be welded is opened at the axis center of the cylindrical table. A positioning pin hole for installing a fixing pin shaft 16 is opened on the cylindrical table. The positioning pin hole corresponds to the light hole of the piston rod head 12 to be welded and extends radially along the cylindrical table.

[0031] The piston rod head 12 to be welded is connected to the welding tooling through a pin 16; since the coaxiality requirements of the piston rod head 12 to be welded and the piston rod body 13 to be welded are very high, if the position of the rod head is controlled only by the clamping force of the left half 14 and the right half 15, misalignment will easily occur, resulting in a large coaxiality error between the rod head and the rod body, so it is necessary to use the pin 16 to achieve accurate positioning of the rod head, wherein the pin 16 and the piston rod head 12 to be welded are connected through a small interference fit.

[0032] The length of the pin 16 is smaller than the diameter of the cylindrical table, so after the piston rod head 12, the left half 14 and the right half 15 to be welded are combined together, the pin 16 is knocked by the copper rod to pass through the light holes of the right half 15, the piston rod head 12 to be welded and the left half 14 in turn until the pin 16 does not protrude from the outer circle of the left half 14 and the right half 15, so as to facilitate the clamping of the three-jaw chuck in the friction welding machine in the later stage.

[0033] The bottom of the left half 14 and the right half 15 are each provided with three light holes, and the six light holes are clearance-matched with the six guide posts 9 , so that the left and right movement of the left half 14 and the right half 15 is controlled by the six guide posts 9 .

[0034] Figure 7 It is a schematic diagram of the structure in which the piston rod and the welding tooling are cooled together in an inclined state; G in the figure is gravity.

[0035] Figure 8 It is a schematic diagram of the structure of the piston rod cooling in a flat state.

[0036] When in use, after welding is completed, the welded piston rod can be manually removed by wearing heat-insulating gloves, and then the piston rod is inverted with the rod head facing downward, so that the 6 light holes on the welding tool are matched with the guide column 9, and the large screw 10 is rotated by the large hand wheel 7 to move the large screw 10 to the right relative to the support block 11, thereby driving the right holding ring 4 to move to the right, wherein the flat plate at the bottom of the right holding ring 4 is changed from sliding friction to rolling friction under the action of the steel ball 17, thereby reducing the friction with the bottom plate 2; since the guide column 9 is connected to the right holding ring 4 by the screw 8 Together, and the guide column 9 is matched with the bottom light hole gap of the right half 15 of the welding tool, so driven by the guide column 9, the right half 15 moves to the right and disengages from the pin 16 and the left half 14 until the connecting block 5 contacts the supporting block 11, and then the small hand wheel 19 is turned to drive the small screw 18 to move to the left, and the small screw 18 passes through the light hole on the right holding ring 4 and rests on the pin 16, and the small hand wheel 19 is continued to be turned until the pin 16 completely comes out of the light hole of the left holding ring 1, so that the piston rod is completely separated from the welding tool and the pin. The external thread of the large screw 10 is a left-handed thread, and the internal threaded hole is a right-handed thread. When the small screw 18 moves to the left in a counterclockwise direction, the large screw should move to the right. However, since the connecting block 5 is in contact with the supporting block 11 at this time, the right movement of the large screw is restricted, so the large screw 10 remains stationary and the small screw 18 moves to the left; then the left half 14 can be separated from the pin 16 using pliers, and finally the separate piston rod is laid flat on a clean, high-temperature resistant floor or shelf, keeping the weld of the piston rod and the rod body on the same horizontal plane for automatic cooling; the coaxiality described in the article is simply the degree of bending, the more bending it is, the lower the coaxiality is. As long as there is no violent collision during the movement process, the coaxiality will not be affected.

Claims

1. A manual post-weld separation device for friction welding, characterized in that: The invention comprises a left holding ring (1) and a right holding ring (4) for positioning a welding tool and a piston rod after welding. The relative positioning surfaces of the left holding ring (1) and the right holding ring (4) are arc surfaces matched with the welding tool. The lower ends of the left holding ring (1) and the right holding ring (4) are fixedly connected with a flat plate. The flat plate is provided with a plurality of guide columns (9) matched with the light holes on the welding tool for positioning. The flat plate at the bottom of the left holding ring (1) is fixed to one side of the base (2). The flat plate at the bottom of the right holding ring (4) and the right holding ring (4) are connected to form a whole body which can move away from and close to the left holding ring (1) with the transverse movement of the driving device. The right holding ring (4) and the left holding ring (1) are fixedly connected to the left holding ring (1). A symmetrical through hole is respectively opened on the right and left holding rings (4) and (1), the through hole being coaxially arranged with the positioning pin hole on the welding fixture, the aperture of the through hole being larger than the aperture of the positioning pin hole on the welding fixture, the separation device also comprising an ejection device capable of horizontally moving along the through holes on the right holding ring (4) and the left holding ring (1) to eject the pin shaft (16) of the welding fixture; a groove is provided on the base (2), a plurality of steel balls (17) are laid flat in the groove, one end of the groove is flush with the right end surface of the plane at the bottom of the left holding ring (1), and the depth of the groove is equal to the ball diameter of the steel ball (17); The driving device comprises a connecting block (5), a large screw rod (10) and a supporting block (11); the connecting block (5) is fixed on the surface opposite to the positioning surface of the right holding ring (4); the interior of the connecting block (5) is a hollow cavity; the supporting block (11) is fixed on the base (2); one end of the large screw rod (10) passes through the threaded hole on the supporting block (11) and the through hole on the connecting block (5) in sequence, and then the large nut (6) is installed, and then the large screw rod (10) and the connecting block (5) are assembled together; a large hand wheel (7) is installed on the other end of the large screw rod (10); the through hole on the connecting block (5) and the threaded hole on the supporting block (11) are coaxially arranged; The ejection device comprises a small screw (18) which is coaxially arranged with the through holes on the right holding ring (4) and the left holding ring (1); the small screw (18) is assembled in the internal thread through hole of the large screw (10) and is threadedly connected with the internal thread through hole of the large screw (10); the small screw (18) is longer than the large screw (10); and a small hand wheel (19) is arranged at one end of the small screw (18).

2. A manual post-weld separation device for friction welding according to claim 1, characterized in that: The upper ends of the positioning surfaces of the left embrace ring (1) and the right embrace ring (4) are provided with chamfers for guiding.

3. A manual post-weld separation device for friction welding according to claim 1, characterized in that: The external thread groove of the large screw rod (10) is arranged in the opposite direction to the internal thread groove of the internal thread through hole.

4. A manual post-weld separation device for friction welding according to claim 1, characterized in that: The connection block (5) and the right holding ring (4) are provided with assembly screw holes at corresponding positions and are connected into one piece via bolts.

5. The manual post-weld separation device for friction welding according to claim 1, characterized in that: There are three guide columns (9) on each flat plate. The bottom of the guide column (9) and the corresponding flat plate are provided with mounting screw holes, and the guide column (9) is fixed to the corresponding position of the flat plate by screws.

6. The manual post-weld separation device for friction welding according to claim 1, characterized in that: The welding tool comprises a left half (14) and a right half (15) of the same structure. When the left half (14) and the right half (15) are closed, they form a cylindrical table. A positioning hole for positioning the piston rod head (12) to be welded is provided at the axis center of the cylindrical table. A positioning pin hole for installing a fixing pin shaft (16) is provided on the cylindrical table. The positioning pin hole corresponds to the light hole of the piston rod head (12) to be welded and extends radially along the cylindrical table.

7. A manual post-weld separation device for friction welding according to claim 6, characterized in that: The length of the pin shaft (16) used for assembling the welding tool and the piston rod head (12) is smaller than the diameter of the cylindrical table, and the pin shaft (16) and the light hole of the piston rod head (12) to be welded have a small interference fit.

8. The manual post-weld separation device for friction welding according to claim 6, characterized in that: The bottoms of the left half (14) and the right half (15) are each provided with three light holes, and each light hole is clearance-matched with a corresponding guide column (9).

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