Polygonal counter bore forming device

Abstract

The utility model discloses a polygonal counter bore forming device which comprises a counter bore punch, a hold-down seat, a hold-down seat pressure spring, a pressure spring seat, a supporting seat, a positioning pin, a positioning pin pressure spring and an adjusting screw. A positioning pin is elastically arranged in the supporting seat in a penetrating manner through a positioning pin pressure spring and an adjusting screw which are arranged in the supporting seat; the counter bore punch comprises a punching shaft and a limiting boss arranged on the punching shaft, the punching shaft is provided with a chamfering forming head on one side of the limiting boss, the chamfering forming head is arranged in a pressing and holding seat, and the punching shaft penetrates out of the pressing and holding seat, is sleeved with a pressing and holding seat pressure spring, penetrates out of a pressure spring seat and is provided with a locking nut. And the hold-down seat and the pressure spring seat are elastically propped against each other through the hold-down seat pressure spring. The forming device for the polygonal counter bore is particularly suitable for directly chamfering the polygonal hole in the assembling process to form the polygonal counter bore.

Description

Technical Field

[0001] The utility model relates to a countersink forming device used in the production process of sheet metal parts, in particular to a polygonal countersink forming device. Background Art

[0002] Currently, the installation of upper and lower covers for aluminum chassis used in inverters and other electronic products must not only meet explosion-proof requirements but also ensure a tight seal. To this end, hexagonal countersunk rivet nuts offer the lowest cost and most reliable installation method. However, in practice, the chamfers of hexagonal countersunk holes are difficult to machine. Since the aluminum sheet doesn't meet the required strength, CNC machining is not an option. Instead, specialized molds are typically required, which is costly. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a polygonal countersunk hole forming device which can greatly reduce the cost.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a polygonal countersink forming device, comprising: a support seat, a positioning pin, a positioning pin compression spring, an adjusting screw and a countersink punch, a holding seat, a holding seat compression spring, a compression spring seat, and a locking nut; a compression spring receiving hole is opened on the end surface of the support seat, and the support seat is provided with a polygonal pin hole corresponding to the polygonal countersink on the bottom wall of the compression spring receiving hole, and the polygonal pin hole is smaller than the compression spring receiving hole connected to it; the positioning pin comprises: a head corresponding to the polygonal pin hole on the support seat, and a tail with a diameter larger than the polygonal pin hole; the head of the positioning pin is inserted into the polygonal pin hole of the support seat, and the tail of the positioning pin, the positioning pin compression spring and the adjusting screw are sequentially arranged in the compression spring receiving hole of the support seat; the countersink punch comprises: a stamping shaft, a limiting boss is provided on the stamping shaft, and a side of the stamping shaft is provided with a The chamfered forming head corresponds to the polygonal countersunk hole, and the stamping shaft is a stepped shaft on the other side of the limiting boss, with the inner section close to the limiting boss being thicker and the outer section away from the limiting boss being thinner, and an external locking thread is provided on the outer section of the stamping shaft; a forming head placement hole corresponding to the limiting boss on the stamping shaft is provided on the corresponding end face of the holding seat, and a stamping shaft through hole corresponding to the inner section of the stamping shaft is provided on the bottom wall of the forming head placement hole of the holding seat, and the stamping shaft through hole is smaller than the forming head placement hole; a stepped mounting hole corresponding to the stamping shaft is provided in the compression spring seat, and the stepped mounting hole includes: a compression spring placement hole with a larger diameter, and a stamping shaft through hole with a smaller diameter; after the stamping shaft of the countersunk punch passes through the stamping shaft through hole of the holding seat and the holding seat compression spring is installed, the outer section of the stamping shaft passes through the stamping shaft through hole of the compression spring seat and is installed with a locking nut, and the holding seat compression spring is placed in the compression spring placement hole of the compression spring seat.

[0005] As a preferred solution, in the polygonal countersunk hole forming device, the chamfer forming head is further provided with a forming guide boss corresponding to the polygonal countersunk hole.

[0006] As a preferred solution, in the polygonal countersunk hole forming device, the forming guide boss is provided with a guide chamfer.

[0007] As a preferred solution, in the polygonal countersunk hole forming device, a guide column that cooperates with the positioning pin compression spring is further provided on the tail of the positioning pin, and the guide column is provided in the positioning pin compression spring.

[0008] As a preferred solution, in the polygonal countersunk hole forming device, the specific setting method of the adjusting screw is: the compression spring mounting hole of the support seat is provided with an internal adjusting thread, and the adjusting screw is arranged on the internal adjusting thread of the compression spring mounting hole of the support seat.

[0009] As a preferred solution, in the polygonal countersunk hole forming device, the punching shaft is provided with a handle for clamping, and the diameter of the handle is smaller than the outer section of the punching shaft.

[0010] As a preferred solution, in the polygonal countersunk hole forming device, the support seat is provided with an annular supporting boss at the corresponding end where the polygonal pin hole is opened.

[0011] As a preferred solution, in the polygonal countersink forming device, the polygonal countersink is a hexagonal countersink.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model provides a positioning pin, a positioning pin compression spring, and an adjusting screw in the support seat, so that the positioning pin can extend from the support seat in a free state and extend into the polygonal hole to be formed. By providing a holding seat, a holding seat compression spring, a compression spring seat, and a locking nut on the countersink punch, the holding seat always rests on the workpiece during the process of the countersink punch punching the polygonal hole to form the polygonal countersink and withdrawing from the polygonal countersink after punching is completed, so that the countersink punch can be smoothly separated from the workpiece. The entire forming process is very simple, convenient, and smooth, and the cost of the entire forming device is low.

[0014] 2. The utility model provides a forming guide boss on the chamfering forming head and chamfers the forming guide boss, so that the downward movement of the countersink punch is smoother.

[0015] 3. The utility model provides a guide column at the tail of the positioning pin, so that the positioning pin compression spring can maintain a good upright posture.

[0016] 4. The utility model provides an internal adjustment thread on the compression spring installation hole. On the one hand, the adjustment screw can be conveniently set as a spring seat in the compression spring installation hole. On the other hand, the preload force of the positioning pin compression spring can be adjusted by adjusting the position of the adjustment screw in the compression spring installation hole.

[0017] 5. The utility model greatly facilitates the clamping of the countersink punch by providing a handle for clamping on the punching shaft, so that the countersink punch can be easily clamped to corresponding equipment such as machine tools.

[0018] 6. The utility model supports the periphery of the polygonal hole on the workpiece by arranging annular supporting bosses at the corresponding ends of the polygonal pin holes on the support base. There is no need to make the support base as thick as the diameter of the annular supporting bosses, thereby saving material costs and reducing the weight of the support base. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional structural diagram of the polygonal countersunk hole forming device of the present invention.

[0020] Figure 2 It is a schematic diagram of the exploded structure after the forming device of the polygonal countersunk hole described in the utility model is hidden.

[0021] Figure 3 It is a schematic diagram of the exploded structure of the polygonal countersunk hole forming device of the utility model without being hidden.

[0022] Figure 4 The utility model is a schematic diagram of the use state of forming hexagonal countersunk holes in an aluminum plate chassis.

[0023] Figure 5 It is a schematic diagram of the structure of the hexagonal hole before forming.

[0024] Figure 6 It is a structural diagram of the hexagonal countersunk hole after forming.

[0025] Figures 1 to 6: The figures in the figure are: 12, stamping shaft, 120, limiting boss, 121, chamfered forming head, 122, forming guide boss, 123, guide chamfer, 125, inner section, 126, outer section, 127, handle, 13, holding seat, 131, forming head placement hole, 132, stamping shaft through hole, 14, holding seat compression spring, 15, compression spring seat, 151, compression spring placement hole, 152, stamping shaft through hole, 16, locking nut, 20, support seat, 200, annular support boss, 201, compression spring placement hole, 202, hexagonal pin hole, 21, locating pin, 211, head, 212, tail, 213, guide column, 22, locating pin compression spring, 23, adjusting screw, 3, workpiece, 31, hexagonal hole, 32, hexagonal countersunk hole, 9, aluminum plate chassis. DETAILED DESCRIPTION

[0026] The specific implementation scheme of the polygonal countersunk hole forming device described in the present invention will be described in detail below with reference to the accompanying drawings, taking the forming of a hexagonal countersunk hole as an example.

[0027] like Figures 1 to 3 As shown, the present invention is a polygonal countersink forming device, which comprises: a support seat 20, a positioning pin 21, a positioning pin compression spring 22, an adjusting screw 23 and a countersink punch, a holding seat 13, a holding seat compression spring 14, a compression spring seat 15, and a locking nut 16; the end surface of the support seat 20 is provided with a compression spring placement hole 201, and the support seat 20 is provided with a bottom wall of the compression spring placement hole 201. Figure 6 The hexagonal counterbore 32 shown corresponds to the hexagonal pin hole 202 (see Figure 3As shown), the diameter of the hexagonal pin hole 202 is smaller than the diameter of the compression spring placement hole 201 connected thereto; the specific structure of the positioning pin 21 includes: a head 211 corresponding to the hexagonal pin hole 202 on the support seat 20, and a tail 212 with a diameter larger than the hexagonal pin hole 202, the tail 212 of the positioning pin 21 is further provided with a guide column 213 that cooperates with the positioning pin compression spring 22, the head 211 of the positioning pin 21 is inserted into the hexagonal pin hole 202 of the support seat 20, the tail 212 and the guide column 213 of the positioning pin 21, as well as the positioning pin compression spring 22 and the adjusting screw 23 are sequentially arranged on the support seat 20 The inner end of the positioning pin compression spring 22 is sleeved on the guide column 213, and the outer end of the positioning pin compression spring 22 is against the adjusting screw 23. The specific arrangement of the adjusting screw 23 is as follows: the compression spring installation hole 201 of the support seat 20 is provided with an internal adjusting thread, and the adjusting screw 23 is provided on the internal adjusting thread of the compression spring installation hole 201 of the support seat 20 (which belongs to the conventional technology in this field and will not be described in detail here); the specific structure of the countersink punch includes: a punching shaft 12, a limiting boss 120 is provided on the punching shaft 12, and the punching shaft 12 is on one side of the limiting boss 120 ( Figures 1 to 3 The lower end of Figure 6 The chamfering forming head 121 corresponding to the hexagonal countersunk hole 32 shown in FIG. Figure 6 The hexagonal countersunk hole 32 shown corresponds to the formed guide boss 122, and the formed guide boss 122 is provided with a guide chamfer 123 (which belongs to the conventional technology in this field and will not be described in detail here); the stamping shaft 12 is a stepped shaft on the other side of the limiting boss 120, with the inner section 125 close to the limiting boss 120 being thicker and the outer section 126 away from the limiting boss 120 being thinner. The outer section 126 of the stamping shaft 12 is provided with an external locking thread corresponding to the locking nut 16, and the outer section 126 of the stamping shaft 12 is provided with a handle 127 which is coaxial with the stamping shaft 12 and has a diameter smaller than that of the outer section 126 of the stamping shaft 12; the corresponding end surface of the pressing seat 13 ( Figure 1 and Figure 2The lower end surface of the punching shaft 12 is provided with a forming head placement hole 131 corresponding to the limiting boss 120 on the punching shaft 12, and the pressing seat 13 is provided with a punching shaft through hole 132 corresponding to the inner section 125 of the punching shaft 12 on the bottom wall of the forming head placement hole 131. The diameter of the punching shaft through hole 132 is smaller than the diameter of the forming head placement hole 131; the compression spring seat 15 is provided with a stepped mounting hole corresponding to the punching shaft 12, and the stepped mounting hole The mounting holes include: a compression spring placement hole 151 with a larger diameter, and a stamping shaft through hole 152 with a smaller diameter; after the stamping shaft 12 of the countersunk punch passes through the stamping shaft through hole 132 of the pressure holding seat 13 and the pressure holding seat compression spring 14 is installed, the outer section 126 of the stamping shaft 12 passes through the stamping shaft through hole 152 of the compression spring seat 15 and is installed with a locking nut 16, and the upper part of the pressure holding seat compression spring 14 is placed in the compression spring placement hole 151 of the compression spring seat 15.

[0028] In actual application, the support base 20 has a polygonal pin hole 202 at the corresponding end ( Figures 1 to 3 An annular supporting boss 200 is provided at the upper end thereof.

[0029] The working principle of the utility model is: a workpiece 3 with a hexagonal hole 31 is opened (see Figure 5 The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin 21. The locating pin 21 is pressed against the workpiece 3 and the workpiece 3 is pressed against the locating pin Figure 5 The hexagonal holes 31 shown are extruded Figure 6 The hexagonal countersunk hole 32 is shown; after the extrusion is completed, the riveting machine moves upward, and under the thrust of the holding seat compression spring 14, the holding seat 13 is always pressed on the workpiece 3 before the forming guide boss 122 on the punching shaft 12 leaves the hexagonal pin hole 202 of the support seat 20, thereby ensuring that the punching shaft 12 can be smoothly withdrawn from the workpiece 3.

[0030] In actual use, the forming device of the utility model can be used to directly Figure 4 The hexagonal holes on the aluminum plate chassis 9 shown are countersunk.

[0031] In summary, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made in accordance with the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A device for forming a polygonal countersunk hole, comprising: The camming tool of the present invention is characterized in that the camming tool further comprises: a positioning pin, a positioning pin compression spring, an adjusting screw, a pressure holding seat, a pressure holding seat compression spring, a compression spring seat and a locking nut; a compression spring receiving hole is provided on the end surface of the support seat, and the support seat is provided with a polygonal pin hole corresponding to the polygonal countersunk hole on the bottom wall of the compression spring receiving hole, and the polygonal pin hole is smaller than the compression spring receiving hole connected to it; the positioning pin comprises: a head corresponding to the polygonal pin hole on the support seat, and a tail with a diameter larger than the polygonal pin hole; the head of the positioning pin is passed through the polygonal pin hole of the support seat, and the tail of the positioning pin, the positioning pin compression spring and the adjusting screw are sequentially arranged in the compression spring receiving hole of the support seat; the camming tool comprises: a stamping shaft, a limiting boss is provided on the stamping shaft, and a polygonal pin hole is provided on one side of the limiting boss The cam is provided with a chamfered forming head corresponding to the shaped countersunk hole, and the stamping shaft is a stepped shaft on the other side of the limiting boss, with the inner section close to the limiting boss being thicker and the outer section away from the limiting boss being thinner, and an external locking thread is provided on the outer section of the stamping shaft; a forming head placement hole corresponding to the limiting boss on the stamping shaft is provided on the corresponding end face of the pressing seat, and a stamping shaft through hole corresponding to the inner section of the stamping shaft is provided on the bottom wall of the forming head placement hole of the pressing seat, and the stamping shaft through hole is smaller than the forming head placement hole; a stepped mounting hole corresponding to the stamping shaft is provided in the compression spring seat, and the stepped mounting hole includes: a compression spring placement hole with a larger diameter and a stamping shaft through hole with a smaller diameter; after the stamping shaft of the countersunk punch passes through the stamping shaft through hole of the pressing seat and the pressing seat compression spring is installed, the outer section of the stamping shaft passes through the stamping shaft through hole of the compression spring seat and is installed with a locking nut, and the pressing seat compression spring is placed in the compression spring placement hole of the compression spring seat.

2. A polygonal countersunk hole forming device according to claim 1, characterized in that: The chamfering forming head is also provided with a forming guide boss corresponding to the polygonal countersunk hole.

3. The polygonal countersunk hole forming device according to claim 2, characterized in that: The forming guide boss is provided with a guide chamfer.

4. The polygonal countersunk hole forming device according to claim 1, characterized in that: A guide column that matches the positioning pin compression spring is also provided on the tail of the positioning pin, and the guide column is provided in the positioning pin compression spring.

5. The polygonal countersunk hole forming device according to claim 1, characterized in that: The specific arrangement of the adjusting screw is as follows: the compression spring placement hole of the support seat is provided with an internal adjusting thread, and the adjusting screw is arranged on the internal adjusting thread of the compression spring placement hole of the support seat.

6. The polygonal countersunk hole forming device according to claim 1, characterized in that: The punching shaft is provided with a handle for clamping, and the diameter of the handle is smaller than the outer section of the punching shaft.

7. The polygonal countersunk hole forming device according to claim 1, characterized in that: The support seat is provided with an annular supporting boss at the corresponding end where the polygonal pin hole is opened.

8. A polygonal countersunk hole forming device according to any one of claims 1 to 7, characterized in that: The polygonal countersink is a hexagonal countersink.

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