Square tube punching die

Abstract

The utility model relates to the technical field of punching of pipe fittings, in particular to a square pipe punching die. Comprising an automatic feeding and discharging mechanism and a punching mechanism, one end of a square tube is fixedly connected with the automatic feeding and discharging mechanism, and the other end of the square tube is arranged in the punching mechanism; the punching mechanism comprises a through hole punching needle and a non-through hole punching needle, the non-through hole punching needle is fixed on a punching needle fixing plate, and the punching needle fixing plate is fixedly connected with the upper die plate; the middle plate is fixedly connected with the upper die plate, a blocking plate groove is formed in the middle plate, the through hole punching needle blocking plate is arranged in the blocking plate groove in a sliding mode, a first through hole is formed in the through hole punching needle blocking plate, a through hole punching needle sliding groove is correspondingly formed in the portion, below the blocking plate groove, of the middle plate, and the upper portion of the through hole punching needle is movably arranged in the through hole punching needle sliding groove. And the through hole punching needle is in clearance fit with the first through hole. According to the square tube punching device, through hole punching operation and non-through hole punching operation of a square tube can be conducted at the same time, the punching efficiency of the square tube is improved, and the structure of the square tube punching device is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe fitting's punching technology field especially a square tube punching die. BACKGROUND

[0002] Square tube is a kind of pipe type with square section, and common square tube is mostly steel pipe, in some occasions, square tube needs to be punched. At present, the traditional method of punching machine punching is usually used for square tube punching process, and the punching of square tube includes through hole and non-through hole punching.

[0003] In the common punching process, when the holes on the square tube are uniformly distributed, they can be clamped and punched at one time.

[0004] When the holes on the square tube are unevenly distributed, the square tube needs to be clamped and positioned twice: the non-through hole punching is realized in the first clamping and positioning process, and the through hole punching is realized in the second clamping and positioning process. The problems are: (1) twice clamping and positioning will greatly reduce the punching efficiency of square tube; (2) twice positioning process will inevitably produce error, and positioning error will directly affect the accuracy of punching, thus reducing the punching precision, and serious error will directly lead to the scrap of square tube. SUMMARY

[0005] The utility model aims at overcoming the above-mentioned defects in the prior art, and provides a square tube punching die, which realizes the simultaneous through hole punching operation and non-through hole punching operation of square tube, realizes the one-time clamping and punching of square tube with unevenly distributed holes, improves the punching efficiency and precision of square tube, and simplifies the structure of square tube punching device.

[0006] The technical scheme of the utility model is: a square tube punching die, which comprises an automatic feeding and withdrawing mechanism and a punching mechanism, one end of the square tube is fixedly connected with the automatic feeding and withdrawing mechanism, and the other end of the square tube is arranged in the punching mechanism.

[0007] The punching mechanism comprises a through hole punch pin and a non-through hole punch pin, the non-through hole punch pin is fixed on a punch pin fixed plate, and the punch pin fixed plate is fixedly connected with an upper die plate.

[0008] The middle plate is fixedly connected with the upper die plate, the middle plate is provided with a baffle slot, a through hole punch pin baffle plate is slidably arranged in the baffle slot, the through hole punch pin baffle plate is provided with a first through hole, the middle plate below the baffle slot is correspondingly provided with a through hole punch pin sliding groove, the upper part of the through hole punch pin is movably arranged in the through hole punch pin sliding groove, and the through hole punch pin and the first through hole are in clearance fit.

[0009] When the first through hole and the through hole punch pin sliding groove are in a staggered state, the through hole punch pin completes the through hole of the through hole, and at this time, the punching of the through hole and the non-through hole can be realized simultaneously; when the first through hole and the through hole punch pin sliding groove are through up and down, the through hole punch pin enters the first through hole, and at this time, only the non-through hole punching is realized.

[0010] The automatic feeding and withdrawing mechanism comprises:

[0011] The first cylinder is connected with the moving part;

[0012] The movable plate is fixedly connected with the telescopic rod of the first cylinder, and the side of the movable plate facing the punching mechanism is provided with a groove;

[0013] The crank is connected with the end of the telescopic rod of the first cylinder, and the bottom end is fixed with an upper pressing claw; the lower end of the crank is arranged in the groove and rotationally connected with the groove wall;

[0014] The upper pressing claw is located above the square tube;

[0015] The lower pressing claw is fixedly connected with the movable plate and located below the inner side of the upper wall of the square tube.

[0016] The moving part comprises:

[0017] The moving support comprises a cylinder fixing plate and slide plates located on the symmetrical two sides of the cylinder fixing plate; the cylinder fixing plate is fixedly connected with the slide plates;

[0018] The gear is meshed with the rack, and the rack is fixed on the slide plate on one side;

[0019] The machine tool guide rail is located below the slide plate and is in sliding connection with the slide plate.

[0020] The punching mechanism comprises:

[0021] The upper die plate is fixedly connected with a top plate, a middle plate and a punch pin fixing plate in sequence on the lower surface; a plurality of workpiece locking columns are fixed on the top plate; and non-through hole punch pins and positioning punch pins are fixed on the punch pin fixing plate;

[0022] The lower die plate is fixedly connected with a die and a punch pin guide plate in sequence on the upper surface from bottom to top; the square tube is arranged in the die; the through hole punch pin, the non-through hole punch pin and the workpiece locking column penetrate through the punch pin guide plate;

[0023] The ball guide sleeve guide column is fixedly connected with the lower die plate at the bottom end and movably connected with the upper die plate at the upper end.

[0024] The ball guide sleeve guide column comprises:

[0025] The guide column is fixedly connected with the lower die plate at the bottom end, and the upper die plate limiting disc is fixed at the top end, a ball guide sleeve is slidably sleeved on the upper end of the upper die plate limiting disc, and a plurality of rollable balls are arranged in the ball guide sleeve;

[0026] The outer steel sleeve is fixed in the upper die plate and located at the annular outer side of the ball guide sleeve, the ball guide sleeve and the balls of the outer steel sleeve are in sliding friction, and the outer steel sleeve drives the ball guide sleeve to move downward through rolling friction during downward movement;

[0027] The first spring is wound on the annular outer side of the guide column, one end of the first spring is in contact with the ball guide sleeve, and the other end of the first spring is in contact with the lower die plate.

[0028] The plug plate groove is arranged in the middle plate and perpendicular to the length direction of the square tube, and one end of the through-hole punch plug plate is connected with the second air cylinder.

[0029] The recess is arranged in the die inner wall along the length direction of the square tube, and the part to be punched of the square tube is arranged in the recess;

[0030] Two locking blocks are arranged in each recess, and the square tube is located between the two locking blocks.

[0031] The arc-shaped groove is arranged on the side wall of the locking block facing the recess, the arc-shaped groove is arranged on the inner wall of the die corresponding to the arc-shaped groove, the arc-shaped groove of the locking block and the arc-shaped groove of the inner wall of the die form a cylindrical groove, and the locking block and the cylindrical groove are in interference fit.

[0032] The adjusting jack is arranged on the two symmetrical outer walls of the die, the threaded hole is arranged in the corresponding locking block, the light hole is arranged in the die, the inner end of the adjusting jack is in threaded connection with the locking block, and the adjusting jack is in movable connection with the die membrane.

[0033] The second spring is connected between the outer end of the adjusting jack and the die, and the second spring is wound on the annular outer side of the adjusting jack.

[0034] The punching blanking bottom die is arranged on the bottom surface of the die directly below the through-hole punch pin, the blanking through hole is arranged on the punching blanking bottom die, the blanking through hole is a tapered slot hole, and the blanking through hole is small at the top and large at the bottom.

[0035] The utility model discloses the following beneficial effects:

[0036] (1) through automatic feeding and withdrawing mechanism, the automatic feeding and withdrawing mechanism is realized to the square tube, and the feeding and withdrawing process of the square tube is realized through automatic feeding and withdrawing mechanism, and manual operation is not needed, and the accurate feeding of the square tube is realized by cooperating with the PLC control system.

[0037] (2) the automatic feeding and withdrawing mechanism adopts the structure of crank, upper pressing jaw and lower pressing jaw, realizes the clamping and fixing of the automatic feeding and withdrawing mechanism to the square tube, and improves the clamping and fixing effect of the square tube.

[0038] (3) through the punching mechanism, can realize the hole and not hole punching of square tube, improve the punching efficiency of square tube: when only need to square tube hole punching, move the hole punch block, the square tube on the bottom of the hole punch pin upward thrust, the upper end of the hole punch pin moves to the hole punch block, at this time only not hole punch pin square tube not hole punching; when need to square tube hole punching, use the hole punch block to limit the hole punch pin, realize the hole punching operation of square tube, at this time can realize the hole punching and not hole punching of square tube;

[0039] (4) the application realizes the punching of various forms of holes of square tube, can realize the clamping and punching of uniformly distributed holes once, also realizes the clamping and punching of non-uniformly distributed holes once, improves the punching efficiency and punching precision of square tube. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0041] Figure 2 is the overhead structure schematic diagram of the utility model;

[0042] Figure 3 is the local enlarged structure schematic diagram of the upper pressing jaw and the lower pressing jaw;

[0043] Figure 4 is the explosion structure schematic diagram of the punching mechanism;

[0044] Figure 5 is the structure schematic diagram of the ball guide sleeve guide column;

[0045] Figure 6 is the structure schematic diagram of the locking block and the locking column when clamping the square tube;

[0046] Figure 7 is the structure schematic diagram of the mold core;

[0047] Figure 8 is the structure schematic diagram of the square tube and the punch pin;

[0048] Figure 9 is the structure schematic diagram of the square tube after punching in the embodiment;

[0049] Figure 10 is the structure schematic diagram of the mold core;

[0050] Figure 11 is the structure schematic diagram of the punch pin fixing plate;

[0051] Figure 12 is the structure schematic diagram of the middle plate;

[0052] Figure 13It is the structure schematic view of the through-hole punch pin.

[0053] In the figure: 1 oil cylinder connecting sleeve; 2 upper die plate limiting disc; 3 upper die plate; 4 top plate; 5 middle plate; 6 punch pin fixing plate; 7 punch pin guide plate; 8 square tube; 9 positioning punch pin; 10 die; 11 locking block; 12 guide column; 13 first spring; 14 ball guide sleeve; 15 adjusting top pin; 16 non-through-hole punch pin; 17 lower die plate; 18 workpiece locking column; 19 machine tool guide rail; 20 slide plate; 21 pull rod; 22 rack; 23 gear; 24 motor; 25 stand; 26 first air cylinder; 27 crank; 28 lower pressing jaw; 29 upper pressing jaw; 30 through-hole punch pin; 34 ball guide sleeve guide column; 35 fulcrum; 36 moving support; 37 air cylinder fixing plate; 39 outer steel sleeve; 40 circular-arc-shaped locking hole; 41 second spring; 43 punching and blanking bottom die; 44 die core; 45 punch pin inner die; 46 positioning punch pin inner die; 47 locking column hole; 48 non-through-hole punch pin fixing hole; 49 through-hole punch pin hole; 50 limiting support block; 51 second air cylinder; 52 through-hole punch pin plug plate; 53 plug plate groove; 54 movable plate; 55 non-through hole; 56 through hole. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0055] In the following description, specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be practiced in a variety of manners other than those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below.

[0056] As shown in Figure 1 The square tube punching die includes an automatic feeding and withdrawing mechanism and a punching mechanism, one end of the square tube is arranged in the punching mechanism, and the punching action on the square tube is completed by the punching mechanism. The other end of the square tube is connected with the automatic feeding and withdrawing mechanism, and the feeding of the square tube during the punching process is realized by the automatic feeding and withdrawing mechanism.

[0057] As shown in Figures 1 to 3 The automatic feeding and withdrawing mechanism includes a first air cylinder 26, a crank 27, an upper pressing jaw 29 and a lower pressing jaw 28. The cylinder body of the first air cylinder 26 is fixed on the stand 25, the telescopic rod of the first air cylinder 26 is arranged towards the punching mechanism, and the end of the telescopic rod is hinged with the crank 27. The crank 27 is arc-shaped, the upper end of the crank 27 is hinged with the end of the telescopic rod, and the bottom end of the crank 27 is welded with the upper pressing jaw 29, and the bottom surface of the upper pressing jaw 29 is corrugated.

[0058] The telescopic rod of the first cylinder 26 is fixedly connected with the movable plate 54, the lower part of the crank 27 is hingedly connected with the movable plate 54, the lower part of the movable plate 54 is fixedly connected with the lower pressing claw 28 on the side of the stamping mechanism, and the top surface of the lower pressing claw 28 is corrugated. The upper pressing claw 29 is located above the wall of the square tube, and the lower pressing claw 28 is located below the wall of the square tube. The square tube 8 is fixedly clamped by the upper pressing claw 29 and the lower pressing claw 28.

[0059] In the embodiment, the movable plate 54 includes a vertical plate and a horizontal plate which are fixedly connected vertically. The vertical plate is fixedly connected with the telescopic rod of the first cylinder 26. The horizontal plate is provided with a recess at the middle part on the side of the stamping mechanism, the lower part of the crank 27 is arranged in the recess, and the crank 27 is rotatably connected between the rotating shaft and the side wall of the recess. The bottom of the crank 27 is fixedly connected with the upper pressing claw 29. The lower part of the horizontal plate on both sides of the upper pressing claw 29 is fixedly connected with the lower pressing claw 28. The two lower pressing claws 28 are respectively inserted into the two square tubes 8, and the upper pressing claw 29 is located above the two square tubes 8.

[0060] During the operation of the first cylinder 26, the telescopic rod of the first cylinder 26 moves, and drives the crank 27 connected therewith to rotate around the connecting rotating shaft between the crank and the movable plate 44. During the rotation of the crank 27, the upper pressing claw 29 fixedly connected to the bottom of the crank 27 is raised or lowered. In the embodiment, during the extension of the telescopic rod of the first cylinder 26, the crank 27 rotates counterclockwise around the rotating shaft, and at this time, the upper pressing claw 29 fixedly connected to the bottom of the crank 27 moves downward, thereby realizing the clamping and fixing of the end part of the square tube. When the telescopic rod of the first cylinder 26 is retracted, the crank 27 rotates clockwise around the rotating shaft, and at this time, the upper pressing claw 29 fixedly connected to the bottom of the crank 27 moves upward, thereby releasing the square tube.

[0061] In the application, the stand 25 is connected with the moving support 36, and the moving support 36 is connected with the moving part. During the movement of the moving part, the moving support 36 is driven to move, thereby realizing the reciprocating movement of the first cylinder 26, and pushing the upper pressing claw and the lower pressing claw to the end part of the square tube.

[0062] The moving support 36 includes a cylinder fixing plate 37 at the middle part and a slide plate 20 on both sides of the cylinder fixing plate 37. The slide plate 20 is fixedly connected with the two side walls of the cylinder fixing plate 37, and the stand 25 is fixed on the cylinder fixing plate 37. The slide plate 20 on one side is connected with the moving part. During the movement of the moving part, the slide plate 20 connected therewith is driven to move, thereby driving the cylinder fixing plate 37 and the first cylinder 26 arranged on the cylinder fixing plate 37 to reciprocate. At this time, the slide plate 20 on the other side plays a guiding role.

[0063] The moving part comprises a gear 23, a rack 22 and a machine tool guide rail 19, and the slide plate 20 is in sliding connection with the machine tool guide rail 19 below the slide plate 20. In the embodiment, the bottom surface of the slide plate 20 is provided with a groove, and the corresponding machine tool guide rail 19 is provided with a protrusion which is slidably arranged in the groove, so that the sliding connection between the slide plate 20 and the machine tool guide rail 19 is achieved. Meanwhile, the slide plate 20 is provided with the rack 22, and the gear 23 and the rack 22 are in meshing connection. During the rotation of the gear 23 driven by the motor 24, the rack 22 and the slide plate 20 fixedly connected with the rack 22 are driven to reciprocate through the meshing between the gear 23 and the rack 22. During the reciprocation of the slide plate 20, the machine tool guide rail 19 plays a guiding role.

[0064] During the reciprocation of the slide plate on one side of the moving part along the machine tool guide rail, the slide plate on the other side also reciprocates along the machine tool guide rail in sliding connection with the slide plate, and the reciprocation of the cylinder fixing plate 37 and the first cylinder 26 is guided by the slide plates on both sides.

[0065] As shown in Figure 1 and Figure 4 , the punching mechanism comprises an upper die plate 3, a lower die plate 17 and a ball guide sleeve guide column 34 connecting the upper die plate 3 and the lower die plate 17. In the embodiment, the upper die plate 3 and the lower die plate 17 are in the form of a tetrahedral plate, so the upper die plate 3 and the lower die plate 17 are connected through the ball guide sleeve guide column 34 located at the four corner points. The bottom end of the ball guide sleeve guide column 34 is fixedly connected with the lower die plate 17, and the upper end of the ball guide sleeve guide column 34 is in sliding connection with the upper die plate 3. The middle part of the top surface of the upper die plate 3 is fixedly provided with an oil cylinder connecting sleeve 1, the oil cylinder connecting sleeve 1 is connected with an external oil cylinder, and the upper die plate 3 is driven to move up and down by the external oil cylinder. When the external oil cylinder applies a downward force to the upper die plate 3, the upper die plate 3 moves downward, and the through-hole punch pin and the non-through-hole punch pin connected with the upper die plate 3 also move downward, and in the process of movement, the punching operation of the through hole and the non-through hole of the pipe is realized. When the external oil cylinder applies an upward force to the upper die plate 3, the upper die plate 3 drives the through-hole punch pin and the non-through-hole punch pin to move upward.

[0066] As shown in Figure 5 , the ball guide sleeve guide column 34 comprises a guide column 12, the bottom end of the guide column 12 is fixedly connected with the lower die plate 17, and the upper end of the guide column 12 is slidably sleeved with a ball guide sleeve 14, a plurality of rollable balls are arranged in the ball guide sleeve 14, the annular outer side of the ball guide sleeve 14 is provided with an outer steel sleeve 39, and the outer steel sleeve 39 is in sliding friction with the balls in the ball guide sleeve. Through the rolling friction, when the outer steel sleeve 39 moves downward, the ball guide sleeve 14 moves downward along the guide column 12. Through the balls in the ball guide sleeve 14, the friction between the outer steel sleeve 39 and the ball guide sleeve 14 can be reduced, and the outer steel sleeve 39 is fixedly connected with the upper die plate 3.

[0067] The top end of the guide column 12 is fixed with an upper die plate limiting disc 2, and the upper die plate limiting disc 2 is located above the outer steel sleeve 39. During the lifting process of the upper die plate 3, the outer steel sleeve 39, the guide column 12 plays a limiting and guiding role for the lifting movement of the upper die plate 3, and ensures that the upper die plate 3 is always located directly above the lower die plate 17. The upper die plate limiting disc 2 prevents the upper die plate 3 from being separated from the ball guide sleeve guide column 34, and plays a blocking role for the upper die plate 3.

[0068] The first spring 13 is arranged between the ball guide sleeve 14 and the lower die plate 17, and the first spring 13 is wound on the outer side of the guide column 12. During the downward movement of the outer steel sleeve 39 along with the upper die plate 3, the ball guide sleeve 14 is driven to move downward through sliding friction, and the first spring 13 is pressed by the ball guide sleeve 14 and generates a compression force. When the downward pressure applied on the upper die plate 3 is removed, the ball guide sleeve 14 is automatically reset under the elastic force in the first spring 13, and pushes the outer steel sleeve 39 and the upper die plate 3 to be automatically reset.

[0069] As shown in Figure 4 , the lower part of the upper die plate 3 is sequentially fixed with a top plate 4, a middle plate 5 and a punch pin fixed plate 6. The workpiece locking column 18 is fixed on the top plate 4. The middle plate 5 is provided with a through-hole punch pin. The punch pin fixed plate 6 is fixed with a positioning punch pin and a non-through-hole punch pin. The lower die plate 17 is fixed with a die 10, and the top surface of the die 10 is fixed with a punch pin guide plate 7.

[0070] The top end of the workpiece locking column 18 is fixedly connected with the top plate 4, and the lower end sequentially penetrates through the middle plate 5, the punch pin fixed plate 6, the punch pin guide plate 7 and is inserted into the die 10, thereby locking the square tube.

[0071] The top end of the through-hole punch pin is movably arranged in the middle plate 5, and the top plate 4 limits the top end of the through-hole punch pin. The lower end of the through-hole punch pin sequentially penetrates through the middle plate 5, the punch pin fixed plate 6, the punch pin guide plate 7 and acts on the square tube in the die 10, thereby realizing the through-hole punching of the square tube.

[0072] The top end of the positioning punch pin is fixedly connected with the punch pin fixed plate 6, and the lower end of the positioning punch pin sequentially penetrates through the middle plate 5, the punch pin fixed plate 6, the punch pin guide plate 7 and acts on the square tube in the die 10, thereby realizing the positioning of the square tube.

[0073] The top end of the non-through-hole punch pin is fixedly connected with the punch pin fixed plate 6, and the lower end of the non-through-hole punch pin sequentially penetrates through the middle plate 5, the punch pin fixed plate 6, the punch pin guide plate 7 and acts on the square tube in the die 10, thereby realizing the non-through-hole punching of the square tube.

[0074] In the embodiment, the top plate 4 is a tetrahedral plate, and the four corner points of the top plate 4 are respectively fixed with the workpiece locking column 18.

[0075] As shown in Figure 12 and Figure 13As shown, the middle plate 5 is in the shape of a tetrahedron plate, and a blocking plate groove 53 is arranged in the middle plate 5 and perpendicular to the length direction of the square tube. A through-hole punch pin blocking plate 52 is arranged in the blocking plate groove 53. The through-hole punch pin blocking plate 52 is movably arranged in the blocking plate groove 53, that is, the through-hole punch pin blocking plate 52 can reciprocate in the blocking plate groove 53. One end of the through-hole punch pin blocking plate 52 is connected with the second cylinder 51. During the operation of the second cylinder 51, the through-hole punch pin blocking plate 52 can be driven to reciprocate in the blocking plate groove 53.

[0076] A plurality of vertical through-hole punch pin sliding grooves are arranged in the middle plate below the blocking plate groove 53. The through-hole punch pin 30 is movably arranged in the through-hole punch pin sliding groove. Correspondingly, a plurality of vertical first through holes are also arranged in the through-hole punch pin blocking plate 52. The through-hole punch pin 30 is in clearance fit with the first through hole. The number of the first through hole and the through-hole punch pin sliding groove is mainly determined by the number of the square tube in the mold tire. In the embodiment, when two square tubes are arranged in the mold tire, it means that the punching of the two square tubes needs to be realized at the same time. At this time, two through-hole punch pin sliding grooves are arranged in the bottom of the blocking plate groove 53, and two first through holes are arranged in the through-hole punch pin blocking plate 52.

[0077] During the movement of the through-hole punch pin blocking plate 52 in the blocking plate groove 53, when the first through hole in the through-hole punch pin blocking plate 52 is aligned with the through-hole punch pin sliding groove below it, the upper part of the through-hole punch pin 3 is not blocked. At this time, the through-hole punch pin 30 in the through-hole punch pin sliding groove moves upward under the pushing action of the square tube and enters the first through hole in the through-hole punch pin blocking plate 52. At this time, the through-hole punch pin is in a free state, and the through-hole punch pin will not generate a punching force on the square tube. At this time, the through-hole punching of the square tube does not need to be completed.

[0078] When the through-hole punching of the square tube needs to be completed, first, when the upper die plate rises, the through-hole punch pin automatically falls into the through-hole punch pin sliding groove under the action of its own gravity. Then, the second cylinder 51 drives the through-hole punch pin blocking plate 52 to move in the blocking plate groove 53, so that the first through hole in the through-hole punch pin blocking plate 52 is misaligned with the through-hole punch pin sliding groove in the bottom of the blocking plate groove 53. At this time, the through-hole punch pin 30 is located below the through-hole punch pin blocking plate 52, and the through-hole punch pin blocking plate 52 blocks the through-hole punch pin 30 in the through-hole punch pin sliding groove, so that the through-hole punch pin 30 cannot move upward. Finally, under the action of the external oil cylinder, the lower die plate moves downward, and the lower die plate drives the through-hole punch pin to move downward. Under the action of the punching force, the square tube wall is subjected to the shearing force and extrusion force at the cutting edge of the through-hole punch pin and the punch inner die 45, and the through-hole punching operation is completed. At the same time, the lower die plate drives the non-through-hole punch pin to move downward, and under the action of the punching force, the non-through-hole punching operation of the square tube wall is completed.

[0079] As Figure 4As shown, the punch pin fixing plate 6 is in the shape of a tetrahedron plate, and a plurality of punch pin connecting holes are arranged on the punch pin fixing plate 6 along the length direction of the square tube. The punch pin fixing plate 6 is fixedly connected with the non-through punch pin 16 and the positioning punch pin 9 through the punch pin connecting holes. The number of the punch pin connecting holes is determined by the number of the square tubes in the mold tire. In the embodiment, when two square tubes are arranged in the mold tire, it is required to punch the two square tubes simultaneously. Therefore, two rows of punch pin connecting holes are arranged on the punch pin fixing plate 6.

[0080] As shown in the figure, Figure 11 The four corner points of the punch pin fixing plate 6 are respectively provided with locking column holes 47, and the workpiece locking column 18 penetrates through the locking column holes 47 and is movably arranged in the locking column holes 47. The punch pin fixing plate 6 is provided with non-through punch pin fixing holes 48, and the top end of the non-through punch pin is fixed in the non-through punch pin fixing holes 48. The punch pin fixing plate 6 is also provided with through punch pin holes 49, and the through punch pin penetrates through the through punch pin holes 49 and is movably arranged in the through punch pin holes 49. The bottom surface of the punch pin fixing plate 6 is also fixed with a plurality of limiting support blocks 50. In the embodiment, the limiting support blocks 50 are fixedly connected with the punch pin fixing plate 6 through bolts. When the upper die plate 3, the top plate 4, the middle plate 5 and the punch pin fixing plate 6 accidentally fall, the limiting support blocks 50 can effectively prevent the punch pin guide plate from being crushed due to falling.

[0081] As shown in the figure, Figure 8 In the embodiment, two positioning punch pins 9, four non-through punch pins 16 and one through punch pin 30 are arranged above each square tube 8. The positioning punch pins 9 realize the positioning of the square tube 8 during the punching process, the non-through punch pins 16 realize the punching of the upper side wall of the square tube 8, and the through punch pin 30 realizes the punching of the upper side wall and the lower side wall of the square tube 8.

[0082] As shown in the figure, Figure 9 The square tube after being punched by the mold is provided with through holes 56 and non-through holes 55, and the through holes 56 and the non-through holes 55 are arranged unevenly. The leftmost side of the square tube is provided with four non-through holes 55, and there are twelve non-through holes 55 between the adjacent two through holes 56.

[0083] Through the analysis of the punching process, the four non-through punch pins 16 and the through punch pin 30 simultaneously punch the non-through holes and the through holes of the square tube.

[0084] Next, the four non-through punch pins 16 punch the non-through holes of the square tube twice respectively, and the through holes of the square tube are not punched at this time; then, the four non-through punch pins 16 and the through punch pin 30 punch the non-through holes and the through holes of the square tube again. Then, the above punching operation is repeated to realize the punching of the square tube.

[0085] In the present application, the setting mode of the positioning punch, the non-hole punch and the through-hole punch is not limited to the form disclosed in the present embodiment, and the position of each punch and the content selected need to be determined according to the actual punching requirements of the square tube.

[0086] As shown in Figure 10 , the inside of the square tube 8 is provided with a mold core 44, which plays a guiding and limiting role on the square tube to be punched. The mold core 44 is fixedly connected with the pull rod 21, and the position of the mold core 44 in the square tube 8 is determined through the pull rod 21. The upper surface of the mold core 44 and the position directly below the positioning punch are fixed with a positioning punch inner mold 46, and the positioning punch and the positioning punch inner mold 46 cooperate to determine the position of the mold core 44. The upper surface of the mold core 44 and the position directly below the through-hole punch and the non-hole punch are fixed with a punch inner mold 45, and the punch inner mold 45 is provided with a sharp edge. The wall of the square tube is subjected to the shearing force and extrusion force of the edge of the punch and the punch inner mold 45, and the punching operation is completed.

[0087] As shown in Figure 4 , Figure 6 and Figure 7 , the mold tire 10 is provided with a groove along the length direction of the square tube, and the part of the square tube 8 to be punched is arranged in the groove. In the present embodiment, since the simultaneous punching of two square tubes is realized, two grooves are arranged in the mold tire, and the two square tubes 8 are arranged in the two grooves respectively.

[0088] In order to realize the clamping and fixing of the square tube in the groove, two locking blocks 11 are arranged in each groove, and the square tube 8 is located between the two locking blocks 11. The side wall of the locking block 11 towards the groove is provided with an arc-shaped groove, and the corresponding arc-shaped groove is arranged on the inner wall of the mold tire, and the arc-shaped groove of the locking block and the arc-shaped groove of the inner wall of the mold tire form a cylindrical groove, and the locking block 11 and the cylindrical groove are in interference fit. When the workpiece locking column 18 is inserted into the cylindrical groove, the locking block 11 is pushed towards the square tube 8, so as to clamp the square tube 8 between the two locking blocks 11.

[0089] In the present embodiment, the clamping of one square tube is realized through two workpiece locking columns 18, so the side wall of the locking block 11 towards the groove is provided with two arc-shaped grooves, and the corresponding two arc-shaped grooves are arranged in the inner part of the mold tire. Since the present embodiment can simultaneously punch two square tubes, the mold includes four workpiece locking columns 18.

[0090] In order to further improve the clamping and fixing effect of the square tube, the two symmetrical side walls of the mold tire are respectively provided with an adjusting top screw 15, and the inner end of the adjusting top screw 15 is in threaded connection with the locking block 11, and the adjusting top screw 15 is in movable connection with the mold tire, that is, the locking block 11 is internally threaded, and the top screw through hole in the mold tire is a smooth hole. The outer end of the adjusting top screw 15 is connected with the mold tire through a second spring 41, and the second spring 41 is wound on the annular outer side of the adjusting top screw.

[0091] When the opposite tube needs to be clamped, the adjusting stud 15 is screwed towards the locking block 11, at this time, through the threaded connection between the adjusting stud 15 and the locking block 11, the locking block 11 is pushed towards the square tube, thereby realizing the clamping of the two locking blocks on the square tube, at this time, the second spring 41 between the adjusting stud 15 and the tire mold 10 is in a compressed state.

[0092] When the square tube punching is completed, the position of the square tube needs to be moved, the adjusting stud 15 is screwed away from the locking block 11, when the inner end of the adjusting stud 15 is screwed out of the inner threaded hole of the locking block 11, under the elastic force of the second spring 41, the automatic reset of the adjusting stud 15 is realized.

[0093] The bottom surface of the tire mold directly below the through-hole punching needle is provided with a punching blanking bottom die 43, and the punching blanking bottom die 43 is provided with a blanking through hole. The blanking through hole is a tapered slot hole, which is small at the top and large at the bottom, preventing blanking blockage and ensuring smooth blanking. When the through-hole punching operation is performed on the square tube, the blanking produced during the punching process falls through the blanking through hole. At the same time, long-term punching process will also cause the blade of the blanking through hole to wear, resulting in the inability to smoothly blank, at this time, the punching blanking bottom die 43 can be directly replaced.

[0094] The working principle of the mold is described as follows.

[0095] The two square tubes are manually fed into the automatic feeding and withdrawing mechanism, the lower surface of the upper pressing jaw 29 is pressed against the upper surface of the square tube 8, and the upper surface of the lower pressing jaw 28 clamps the inner wall of the square tube 8, so that one end of the square tube is fixed and clamped, the motor 24 works, the rotation of the gear 23 is converted into the linear motion of the rack 22 through the engagement between the gear 23 and the rack 22, at the same time, the slide plate 20 is moved along the machine tool guide rail 19, and the square tube 8 is moved to the punching mechanism and to the appropriate punching position in the punching mechanism. The motor 25 stops rotating.

[0096] In this embodiment, the punching sequence on the square tube is to start punching from the left end of the square tube, and to push the material to the left in sequence, so as to complete the punching of the square tube in sequence.

[0097] During the first punching process, the square tube 8 is sleeved on the mold core 44, at this time, the positioning punch inner mold 46 is located in the square tube 8, and the positioning punch inner mold 45 is located outside the square tube 8. The positioning punch 9 is longer than the non-through-hole punch and the through-hole punch. In the first working stroke, the positioning punch 9 first punches with the positioning punch inner mold 45 on the mold core 44, at this time, the positioning punch plays a role in positioning and stabilizing the mold core 44.

[0098] After the first piercing, the square tube 8 is pushed to the left. During the next piercing, the positioning punch 9 is in contact with the positioning punch 45 on the mold core, and the positioning punch plays a role in stabilizing the square tube and the mold core.

[0099] When the square tube 8 is being pierced, the external oil cylinder applies downward pressure to the upper die plate 3, and the upper die plate 3 drives the top plate 4, the middle plate 5, and the punch fixing plate 6 to move downward. The positioning punch 9 positions the square tube and the mold core, and the workpiece locking column 18 moves downward into the cylindrical groove formed by the locking block 11 and the mold core 10. The workpiece locking column 18 pushes the locking block 11 to move to the side of the square tube 8, thereby tightening the square tube and achieving accurate positioning.

[0100] In this embodiment, the non-through-hole punch 16 and the through-hole punch 30 move downward into the punch guide plate 7, thereby achieving piercing of four non-through holes and one through hole.

[0101] When piercing the through hole, the second cylinder 51 retracts and pulls the through-hole punch blocking plate 52. At this time, the first through hole in the through-hole punch blocking plate 52 is misaligned with the through-hole punch sliding groove at the bottom of the blocking plate groove. Under the blocking action of the through-hole punch blocking plate 52, the through-hole punch 30 is blocked, and can only complete the piercing action downward, thereby achieving through-hole piercing.

[0102] When only non-through holes are pierced, the piston rod of the second cylinder 51 extends, so that the first through hole in the through-hole punch blocking plate 52 is aligned with the through-hole punch sliding groove at the bottom of the blocking plate groove. Under the upward pushing force of the square tube on the through-hole punch, the upper end of the through-hole punch moves from the through-hole punch sliding groove to the first through hole, thereby achieving the effect that the through-hole punch does not participate in piercing when non-through holes are pierced.

[0103] When a group of piercing is completed, the external oil cylinder lifts the upper die plate 3, and the workpiece locking column 18, the through-hole punch, and the non-through-hole punch move upward with the upper die plate 3. After the workpiece locking column 18 moves away from the locking block 11, the motor 24 operates and continues to feed forward. The slide plate 20 moves while driving the square tube to move forward, thereby achieving feeding of the square tube. The next group of non-through-hole piercing is achieved in turn, and a piercing cycle and piercing operation of the entire square tube are completed. After the entire square tube is pierced, the upper and lower pressing jaws are released, and the pierced square tube can be removed from the mold.

[0104] The square tube punching die provided by the utility model is described in detail. The principle and implementation mode of the utility model are described by applying specific examples. The description of the above examples is only used to help understand the method and core idea of the utility model. It should be pointed out that, for ordinary technical personnel in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claim. The above description of the disclosed examples enables the professional technical personnel in the field to implement or use the utility model. Various modifications of the examples will be obvious to the professional technical personnel in the field, and the general principle defined in this paper can be implemented in other examples without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the examples shown in this paper, but will conform to the widest scope consistent with the principles and novel features disclosed in this paper.

Claims

1. A square tube punching die, characterized in that, It includes an automatic feeding and unloading mechanism and a punching mechanism. One end of the square tube is fixedly connected to the automatic feeding and unloading mechanism, and the other end of the square tube is set in the punching mechanism. The punching mechanism includes through-hole punches and blind-hole punches. The blind-hole punches are fixed on the punch fixing plate, and the punch fixing plate is fixedly connected to the upper template. The middle plate is fixedly connected to the upper template. The middle plate is provided with a blocking plate groove. The through hole punch blocking plate is slidably set in the blocking plate groove. The through hole punch blocking plate is provided with a first through hole. The middle plate below the blocking plate groove is provided with a corresponding through hole punch sliding groove. The upper part of the through hole punch is movably set in the through hole punch sliding groove. The through hole punch and the first through hole are in clearance fit. When the first through hole and the through hole punch groove are misaligned, the through hole punch completes the punching of the through hole. When the first through hole and the through hole punch groove are connected vertically, the through hole punch enters the first through hole.

2. The square tube punching die according to claim 1, characterized in that, Automatic feeding and unloading mechanisms include: The first cylinder has its cylinder body connected to the moving part; The movable plate is fixedly connected to the telescopic rod of the first cylinder, and the movable plate has a groove on the side facing the punching mechanism. The crank has its upper end connected to the end of the telescopic rod of the first cylinder, and its lower end is fixed with an upper pressure claw. The lower end of the crank is set in the groove and is rotatably connected to the groove wall. The upper pressure claw is located above the square tube; The downward pressing claw is fixedly connected to the movable plate and is located below the inner side of the upper wall of the square tube.

3. The square tube punching die according to claim 2, characterized in that, The mobile unit includes: The movable support includes a cylinder fixing plate and slides located on both sides of the cylinder fixing plate, and the cylinder fixing plate is fixedly connected to the slides on both sides. The gear meshes with the rack, which is fixed to a slide on one side. The machine tool guide rail is located below the slide, and the machine tool guide rail and the slide are slidably connected.

4. The square tube punching die according to claim 1, characterized in that, The punching mechanism includes: The upper template has a top plate, a middle plate, and a punch fixing plate fixedly connected to its lower surface in sequence. Several workpiece locking pins are fixed on the top plate, and a blind hole punch and a positioning punch are fixed on the punch fixing plate. The lower template has a mold base and a punch guide plate fixedly connected from bottom to top on its upper surface. The square tube is set inside the mold base, and the through-hole punch, the blind-hole punch and the workpiece locking post pass through the punch guide plate. The ball bearing guide post has its bottom end fixedly connected to the lower template and its top end movably connected to the upper template.

5. The square tube punching die according to claim 4, characterized in that, The ball bearing guide post includes: The guide column is fixedly connected to the lower template at its bottom end and fixed to the upper template limiting plate at its top end. A ball bearing guide sleeve is slidably fitted on its upper end, and several rolling balls are provided inside the ball bearing guide sleeve. The outer steel sleeve is fixed inside the upper template and located on the outer side of the annular ball guide sleeve. There is sliding friction between the outer steel sleeve and the balls of the ball guide sleeve. During the downward movement of the outer steel sleeve, the ball guide sleeve is driven to move downward through rolling friction. The first spring is wound around the annular outer side of the guide post, with one end in contact with the ball bearing guide sleeve and the other end in contact with the lower template.

6. The square tube punching die according to claim 1, characterized in that, A blocking groove is provided inside the middle plate and perpendicular to the length of the square tube. One end of the through-hole punch blocking plate is connected to the second cylinder.

7. The square tube punching die according to claim 4, characterized in that, The mold has a groove along the length of the square tube, and the part of the square tube to be punched is set in the groove; Each groove contains two locking blocks, with the square tube positioned between the two locking blocks; The locking block has an arc-shaped groove on the side wall facing the groove, and a corresponding arc-shaped groove is provided on the inner wall of the mold. The arc-shaped groove of the locking block and the arc-shaped groove of the inner wall of the mold form a cylindrical groove, and the locking block and the cylindrical groove are in an interference fit.

8. The square tube punching die according to claim 4, characterized in that, Adjusting screws are provided on the two symmetrical side walls of the mold, and threaded holes are provided in the corresponding locking blocks. Smooth holes are provided inside the mold. The inner end of the adjusting screw is threadedly connected to the locking block, and the adjusting screw is movably connected to the mold. A second spring is connected between the outer end of the adjusting screw and the mold base, and the second spring is wound around the outer ring of the adjusting screw.

9. The square tube punching die according to claim 4, characterized in that, The bottom surface of the die directly below the through-hole punch is provided with a punching and blanking bottom die. The punching and blanking bottom die is provided with a blanking through hole, which is a conical slot hole with a smaller top and a larger bottom.

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