Positioning ram device for a press ram

Abstract

The utility model discloses a positioning pressure head device for riveting press, it includes from below to above fixed positioning plate, four groups of struts and top plate that connect gradually, positioning plate on be provided with lower mould, strut slidingly be provided with dynamic board, and the lower mould is fixedly provided with the upper mould of being suitable for lower mould below, and top plate is equipped with the drive component for driving dynamic board and drive upper mould and drive down of going up and down sliding along the strut, lower mould rotation setting be in positioning plate, positioning plate below be provided with the adjusting unit for driving lower mould rotation and locking. The utility model discloses through setting rotatable lower mould and adjusting unit, can conveniently carry out the slight angle adjustment to lower mould, compensates the deflection deformation of lower mould, makes the deflection extrusion pressure of lower mould from upper mould shift in originally pressed relative place, to this to compensate the deflection deformation of lower mould, makes the deformation to the reverse direction and corrects, to this to improve the service life of lower mould to reduce the replacement cost.

Description

Technical Field

[0001] This utility model relates to the field of machining and assembly, specifically to a positioning pressure head device for a riveting machine. Background Technology

[0002] A riveting machine is a specialized piece of equipment that uses an upper die to apply pressure to a lower die and the workpiece, tightly joining the rivet or rivet post to the riveted part. It is widely used in the assembly and connection processes of electronic components, metal housings, and automotive parts. Existing riveting machines typically use upper and lower dies fixedly mounted at both ends of the machine body. The upper die is driven downwards by hydraulic or pneumatic cylinders to accelerate the production cycle and ensure riveting quality. However, during long-term continuous operation of the riveting machine, the relative positioning and fit between the upper and lower dies often exhibit a gradual increase in positioning deviation due to the high-frequency riveting impact and minor wear.

[0003] When the lower die undergoes eccentric deformation, the riveting load is transmitted to the riveted parts in an asymmetrical direction, leading to eccentric riveting, localized stress concentration, or even incomplete riveting welds, severely affecting product consistency and reliability. In traditional processes, once the lower die deformation exceeds the limit, it is often necessary to remove the lower die from the machine body, replace it with a brand new one, and re-maintain, adjust, and reposition the entire machine. This is not only costly and time-consuming, affecting production efficiency, but also accelerates the aging of the riveting equipment during actual production. The more it is repaired, the less stable it becomes, and many riveting machines prematurely retire due to reduced accuracy after frequent disassembly and reassembly.

[0004] Therefore, there is an urgent need to design a positioning pressure head device for a riveting machine that can compensate for the slight bias deformation of the lower die, so as to improve the service life of a single lower die and meet the actual production and processing needs. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning pressure head device for a riveting machine. This positioning pressure head device can effectively compensate for the slight bias deformation of the lower die, improve the stability of the riveting process and the consistency of product quality, extend the service life of the lower die, and reduce equipment downtime and maintenance time and costs.

[0006] The technical solution adopted by this utility model to solve the above problems is: a positioning pressure head device for a riveting machine, comprising a positioning plate, four sets of support columns and a top plate connected and fixed from bottom to top. A lower mold is provided on the positioning plate, a movable plate is slidably provided on the support columns, an upper mold adapted to the lower mold is fixedly provided below the movable plate, and a driving component is provided on the top plate for driving the movable plate to slide up and down along the support columns and driving the upper mold to press down. The lower mold is rotatably provided on the positioning plate, and an adjustment unit for driving the lower mold to rotate and locking is provided below the positioning plate.

[0007] Preferably, the adjustment unit includes a worm, a worm wheel, and a handle. A connecting shaft is provided at the bottom of the lower mold. The worm is sleeved and fixed on the connecting shaft. The worm and the worm wheel mesh and fit together. The handle is provided at one end of the worm and is used to drive the worm to drive the worm wheel so that the lower mold rotates and the worm self-locks.

[0008] Preferably, the bottom of the lower mold is provided with a scale, the outer circumference of the scale is provided with angle scale lines, and the corresponding scale value is marked every 45° starting from 0°, and the positioning plate is detachably connected with an indicator.

[0009] Preferably, the positioning plate is provided with an installation groove, which includes a circular groove and a sliding groove. The indicator is provided with a base, which is slidably connected to the sliding groove. The installation groove is provided with a rubber plug, which is provided with a sealing part that is compatible with the circular groove and an extension wing. One end of the extension wing is provided with an opening that is compatible with the cross-sectional contour of the positioning plate.

[0010] Preferably, the lower mold is connected to the positioning plate by a friction pad for damping rotation. The bottom of the lower mold has grooves at equal intervals around its circumference. The positioning plate has a placement groove that matches the friction pad. The upper surface of the friction pad has raised stripes at equal intervals around its circumference.

[0011] Preferably, the driving component includes a first hydraulic cylinder, the cylinder body of which is connected and fixed to the top plate via a cylinder gasket, and the piston rod of which is connected and fixed to the moving plate via a floating joint.

[0012] Compared with the prior art, this utility model has the following advantages and effects:

[0013] This invention, by incorporating a rotatable lower die and an adjustment unit, allows for convenient fine-angle adjustment of the lower die, compensating for its bias deformation. This shifts the bias pressure exerted on the lower die by the upper die to a point opposite to its original pressure position, thus compensating for the bias deformation and correcting it in the opposite direction. This improves the lower die's lifespan and reduces replacement costs. This adjustment method can be performed without machine downtime, contributing to consistent riveting processes. Furthermore, the dial and indicator at the bottom of the lower die make angle adjustment more precise and intuitive. The damped rotational connection between the lower die and the positioning plate not only ensures the stability of the lower die during normal riveting but also reduces wear on the worm gear and worm, extending the lifespan of the adjustment unit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a positioning pressure head device for a riveting machine according to an embodiment of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the adjustment unit in an embodiment of the present invention.

[0016] Figure 3 yes Figure 1 A schematic diagram of the clamping unit at point A in the middle.

[0017] Figure 4 yes Figure 1 A magnified view of the area marked B.

[0018] Figure 5 This is a schematic diagram of the installation structure of the indicator and rubber stopper according to an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of the connection structure between the lower mold and the positioning plate through the friction pad in an embodiment of this utility model.

[0020] Figure Numbers: Positioning Plate 11, Support 12, Top Plate 13, Lower Mold 14, Moving Plate 15, Upper Mold 16, Drive Component 17, Adjustment Unit 18, First Oil Cylinder 21, Oil Cylinder Pad 22, Floating Joint 23, Second Oil Cylinder 24, Cylinder Seat 25, Clamp Seat 26, Slide Rail 27, Slide Seat 28, Clamping Block 29, Worm Gear 31, Worm Wheel 32, Handle 33, Connecting Shaft 34, Dial 35, Angle Scale Line 36, Scale Value 37, Indicator 38, Mounting Slot 41, Circular Slot 42, Slide Slot 43, Base 44, Rubber Plug 45, Sealing Part 46, Extension Wing 47, Opening 48, Friction Rubber Pad 51, Groove Pattern 52, Placement Slot 53, Raised Stripe 54. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example:

[0023] See Figure 1 - Figure 6This embodiment relates to a positioning pressure head device for a riveting machine, specifically used to position and adjust the lower die 14 of the riveting machine to solve the riveting quality problem caused by the bias deformation of the lower die 14 during long-term use. Specifically, it includes a positioning plate 11, four sets of support columns 12, and a top plate 13 connected and fixed from bottom to top. The positioning plate 11 is provided with the lower die 14. A movable plate 15 is slidably mounted on the support columns 12. An upper die 16 adapted to the lower die 14 is fixedly mounted below the movable plate 15. A driving component 17 is provided on the top plate 13 for driving the movable plate 15 to slide up and down along the support columns 12 and driving the upper die 16 to press down. The lower die 14 is rotatably mounted on the positioning plate 11. An adjustment unit 18 for driving the lower die 14 to rotate and locking is provided below the positioning plate 11. When the lower die 14 is subjected to bias pressure after long-term and frequent pressing (which can be judged by the quality of the finished riveted parts), the biased side of the lower die 14 can be rotated to the opposite side (180°) by the adjustment unit 18. This causes the bias pressure from the upper die 16 to be transferred to the opposite position where it was originally pressed, thereby compensating for the bias deformation of the lower die 14 and correcting the deformation in the opposite direction, thereby improving the service life of the lower die 14.

[0024] Specifically, in this embodiment, the driving component 17 includes a first hydraulic cylinder 21. The cylinder body of the first hydraulic cylinder 21 is connected and fixed to the top plate 13 via a hydraulic cylinder pad 22, and the piston rod of the first hydraulic cylinder 21 is connected and fixed to the moving plate 15 via a floating joint 23. During the riveting process, the first hydraulic cylinder 21 drives the moving plate 15 to slide up and down along the support column 12, thereby driving the upper die 16 to rivet the lower die 14 and the workpiece. In actual operation, the lower die 14 is first installed on the positioning plate 11, and the position of the lower die 14 is fixed by the clamping unit. See also Figure 2 The clamping unit includes a second hydraulic cylinder 24. The cylinder body of the second hydraulic cylinder 24 is fixedly mounted on the positioning plate 11 via a cylinder seat 25. The piston rod of the second cylinder body is connected and fixedly attached to a clamping seat 26. A slide rail 27 is provided on the positioning plate 11. A slide block 28 that is slidably adapted to the slide rail 27 is connected and fixed below the clamping seat 26. A clamping block 29 is detachably connected to the clamping seat 26. When it is necessary to fix the lower mold 14, the piston rod of the second hydraulic cylinder 24 is extended, causing the clamping seat 26 to slide inward along the slide rail 27, so that the clamping block 29 clamps the lower mold 14, ensuring that the installation position of the lower mold 14 is accurate and stable. When it is necessary to disassemble or adjust the lower mold 14, the piston rod retracts, the clamping seat 26 slides outward along the slide rail 27, and the lower mold 14 is released for easy operation.

[0025] See Figure 2The adjustment unit 18 includes a worm gear 31, a worm wheel 32, and a handle 33. A connecting shaft 34 is provided at the bottom of the lower die 14. The worm gear 31 is sleeved and fixed on the connecting shaft 34, and the worm gear 31 and worm wheel 32 mesh and fit together. The handle 33 is located at one end of the worm gear 31. When the lower die 14 needs to be angled to compensate for bias deformation, the handle 33 is turned to rotate the worm gear 31, which in turn drives the worm wheel 32 to rotate, thereby causing the lower die 14 to rotate around the connecting shaft 34, thus adjusting the angle of the lower die 14. After adjusting to a suitable angle (generally 180°), the self-locking function of the worm gear 31 can lock and fix the lower die 14, ensuring that the adjusted angle remains stable. This invention uses the adjustment unit 18 to correct the bias deformation of the lower die 14, thereby improving its service life, reducing replacement costs, and eliminating the need for maintenance and adjustment of the entire riveting equipment after shutdown (as disassembly increases the assembly tolerance of various components, affecting the consistency of the riveting process).

[0026] See Figure 4 The lower mold 14 has a dial 35 at its bottom, and angle scale lines 36 are provided on the outer circumference of the dial 35. Starting from 0°, corresponding scale values ​​37 are marked at 45° intervals. An indicator 38 is detachably connected to the positioning plate 11. The cooperation of the angle scale lines 36 and the indicator 38 allows the rotation angle of the lower mold 14 to be accurately read, ensuring the accuracy of the adjustment. For example, when the lower mold 14 needs to be rotated 180°, the operator can observe the alignment of the indicator 38 with the angle scale line 36 (e.g., currently located on the 45° angle scale line 36) to precisely adjust the lower mold 14 to the appropriate position (after rotating 180°, the 225° angle scale line 36 is aligned with the indicator 38), thus ensuring effective correction of the bias deformation of the lower mold 14.

[0027] In this embodiment, the indicator 38 is a consumable part, and it is easily damaged by accidental contact when replacing the lower mold 14. Therefore, the indicator 38 must be removed from the positioning plate 11 before replacing the lower mold 14. For details, see [link to documentation]. Figure 5The positioning plate 11 has a mounting groove 41, which includes a circular groove 42 and a sliding groove 43. The indicator 38 is provided with a base 44, which is slidably connected to the sliding groove 43. The diameter of the circular groove 42 is larger than the maximum diameter of the mounting base, and the circular groove 42 is connected to the sliding groove 43. When actually installing the indicator 38, first place the base 44 into the circular groove 42 and align it with the sliding groove 43, and then slide it in along the junction of the sliding groove 43 and the circular groove 42 (the disassembly operation is the reverse). In this embodiment, the mounting groove 41 is fitted with a rubber stopper 45. The rubber stopper 45 is provided with a sealing part 46 that fits into the circular groove 42 and an extension wing 47. One end of the extension wing 47 has an opening 48 that matches the cross-sectional contour of the positioning plate 11. The sealing part 46 of the rubber stopper 45 can effectively prevent dust from entering the mounting groove 41, while the opening 48 of the extension wing 47 can be used to further fix the indicator 38, enhance its stability and prevent its base 44 from sliding out of the groove 43.

[0028] See Figure 6 The lower mold 14 is connected to the positioning plate 11 via a friction pad 51 for damped rotation. The lower surface of the scale 35 at the bottom of the lower mold 14 has evenly spaced grooves 52. The positioning plate 11 has a placement groove 53 that matches the friction pad 51. The upper surface of the friction pad 51 has evenly spaced raised stripes 54. Because there is an assembly gap between the worm gear 32 and the worm 31 when they mesh, slight rotation will still occur when the lower mold 14 is not fixed, causing impact and wear on the mating surfaces. The damped rotation connection provides appropriate rotational resistance, ensuring relative stability of the lower mold 14 during normal riveting, helping to alleviate wear on the worm gear 32 and worm 31 and improving the service life of the adjustment unit 18.

[0029] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A positioning pressure head device for a riveting machine, characterized in that, The device includes a positioning plate, four sets of support columns, and a top plate connected and fixed from bottom to top. A lower mold is provided on the positioning plate. A movable plate is slidably provided on the support columns. An upper mold adapted to the lower mold is fixedly provided below the movable plate. The top plate is provided with a driving component for driving the movable plate to slide up and down along the support columns and driving the upper mold to press down. The lower mold is rotatably provided on the positioning plate. An adjustment unit for driving the lower mold to rotate and locking is provided below the positioning plate.

2. The positioning pressure head device for a riveting machine according to claim 1, characterized in that: The adjustment unit includes a worm, a worm wheel, and a handle. A connecting shaft is provided at the bottom of the lower mold. The worm is sleeved and fixed on the connecting shaft. The worm and the worm wheel mesh and fit together. The handle is provided at one end of the worm and is used to drive the worm to drive the worm wheel so that the lower mold rotates and the worm is self-locking.

3. The positioning pressure head device for a riveting machine according to claim 1, characterized in that: The bottom of the lower mold is provided with a scale, and the outer circumference of the scale is provided with angle scale lines. Starting from 0°, the corresponding scale value is marked at 45° intervals. An indicator is detachably connected to the positioning plate.

4. The positioning pressure head device for a riveting machine according to claim 3, characterized in that: The positioning plate is provided with an installation groove, which includes a circular groove and a sliding groove. The indicator is provided with a base, which is slidably connected to the sliding groove. The installation groove is provided with a rubber plug, which is provided with a sealing part that is compatible with the circular groove and an extension wing. One end of the extension wing is provided with an opening that is compatible with the cross-sectional contour of the positioning plate.

5. A positioning pressure head device for a riveting machine according to claim 1, characterized in that: The lower mold is connected to the positioning plate by a friction pad for damping rotation. The bottom of the lower mold has grooves at equal intervals around its circumference. The positioning plate has a placement groove that matches the friction pad. The upper surface of the friction pad has raised stripes at equal intervals around its circumference.

6. The positioning pressure head device for a riveting machine according to claim 1, characterized in that: The driving component includes a first hydraulic cylinder, the cylinder body of which is connected and fixed to the top plate via a hydraulic cylinder gasket, and the piston rod of which is connected and fixed to the moving plate via a floating joint.

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