A square tube cutting die structure

Abstract

This utility model discloses a square tube cutting die structure, belonging to the field of square tube stamping technology. It includes a lower die base, an upper die base, a die cavity, and a punch. The lower die base is located at the lower end of the upper die base. The die cavity is mounted on the upper wall of the lower die base via a cylindrical pin. A fixing plate is installed on the bottom wall of the upper die base. The punch is located on the side wall of the fixing plate, and a punching head is provided at the lower end of the punch. A limiting groove is provided on the upper wall of the die cavity, and the punching head is matched with the limiting groove. Guide pillars are used for guidance between the die cavity and the stripper plate, ensuring that the punch moves vertically up and down in the stripper plate and smoothly enters the die cavity, achieving uniform punching. To prevent tube cross-sectional deformation during the cutting process, the die cavity and stripper plate are designed according to the tube shape, ensuring that the tube does not wobble in the die, achieving the technical effect of centerless stamping of thin tubes, effectively solving the problems of excessive burrs and cross-sectional deformation in square tubes.

Description

Technical Field

[0001] This utility model belongs to the field of square tube stamping technology, and in particular relates to a square tube cutting die structure. Background Technology

[0002] In the production of tricycles, square tubes are usually cut using a band saw, which results in certain errors in the dimensional accuracy of the cut. This causes inconsistencies in the gap between the support post and the vehicle's handrail, making it easy for inconsistent welds and burn-through to occur during welding, thus affecting the product's appearance quality. To solve these problems, it is necessary to improve the accuracy of the tube cutting in the preceding process. Therefore, tube stamping dies are used for its production. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a square tube cutting mold structure, which effectively solves the problems of large burrs and cross-sectional deformation of square tubes during blanking.

[0004] The technical solution adopted by this utility model is as follows: A square tube cutting mold structure includes a lower mold base, an upper mold base, a die cavity, and a punch. The lower mold base is located at the lower end of the upper mold base. The die cavity is located on the upper wall of the lower mold base by means of a cylindrical pin. A fixing plate is installed on the bottom wall of the upper mold base by means of internal hexagonal bolts. The punch is located on the side wall of the fixing plate. A punching head is provided at the lower end of the punch. A limiting groove is provided on the upper wall of the die cavity. The punching head is matched with the limiting groove.

[0005] The upper mold base bottom wall is also equipped with a stripper pin, and a backing plate is movably installed at the lower end of the stripper pin. A spring is installed between the backing plate and the upper mold base bottom wall, and the spring is sleeved on the outside of the stripper pin.

[0006] The bottom wall of the back panel is equipped with a discharge plate, and the lower end of the discharge plate is provided with a second limiting groove. The second limiting groove is located at the upper end of the first limiting groove, and the lower and upper ends of the square tube are respectively engaged in the first limiting groove and the second limiting groove.

[0007] The upper and lower walls of the backing plate are equipped with guide sleeves, a guide post is installed between the guide sleeve on the upper wall of the backing plate and the bottom wall of the upper mold base, and a guide post is installed between the guide sleeve on the bottom wall of the backing plate and the upper wall of the lower mold base.

[0008] The upper wall of the lower mold base is also equipped with a positioning support for fixing the rear end of the square tube.

[0009] The upper die holder has a die shank installed on its upper wall by an internal hex bolt. The upper die holder is fixed to the punch press by the die shank and moves together with the slide block on the punch press.

[0010] The beneficial effects of this utility model after adopting the above structure are as follows:

[0011] (1) Guide pillars are used between the die and the stripper plate, as well as between the die and the stripper plate, to ensure that the punch moves vertically up and down in the stripper plate and smoothly enters the die, thus achieving uniform punching.

[0012] (2) To prevent pipe cross-section deformation during pipe cutting, the die and stripper plate are designed according to the pipe shape to ensure that the pipe does not shake in the mold and achieve the technical effect of thin pipe internal centerless stamping; the material of the stripper plate and die is CR12; the heat treatment hardness is HRC52-54; the stripper plate gap is single +0.1mm and the punch gap is single +0.05mm, which effectively solves the problems of excessive burrs and cross-section deformation of square tube. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] Figure 1 This is a schematic diagram of the structure of a square tube cutting mold proposed in this utility model;

[0015] Figure 2 This is a cross-sectional view of a square tube cutting mold structure proposed in this utility model.

[0016] In the attached diagram: 1. Lower mold base, 2. Guide pillar, 3. Cylindrical pin, 4. Die, 5. Guide sleeve, 6. Stripper plate, 7. Backing plate, 8. Stripper pin, 9. Spring, 10. Fixing plate, 11. Upper mold base, 12. Punch, 13. Mold shank, 14. Positioning support. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] like Figures 1-2 As shown, a square tube cutting die structure includes a lower die base 1, an upper die base 11, a die cavity 4, and a punch 12. The lower die base 1 is located at the lower end of the upper die base 11. The die cavity 4 is mounted on the upper wall of the lower die base 1 via a cylindrical pin 3. A fixing plate 10 is installed on the bottom wall of the upper die base 11 via hexagonal socket bolts. The punch 12 is located on the side wall of the fixing plate 10. A punching head is provided at the lower end of the punch 12. A limiting groove is provided on the upper wall of the die cavity 4. The punching head is matched with the limiting groove.

[0020] The bottom wall of the upper mold base 11 is also equipped with a stripper pin 8. A back plate 7 is movably installed at the lower end of the stripper pin 8. A spring 9 is installed between the back plate 7 and the bottom wall of the upper mold base 11. The spring 9 is sleeved on the outside of the stripper pin 8.

[0021] The bottom wall of the back plate 7 is equipped with a discharge plate 6. The lower end of the discharge plate 6 is provided with a limiting groove 2. The limiting groove 2 is located at the upper end of the limiting groove 1. The lower end and upper end of the square tube are respectively engaged in the limiting groove 1 and the limiting groove 2.

[0022] Guide sleeves 5 are installed on both the upper and lower walls of the backing plate 7. A guide post 2 is installed between the guide sleeve 5 on the upper wall of the backing plate 7 and the bottom wall of the upper mold base 11. A guide post 2 is installed between the guide sleeve 5 on the bottom wall of the backing plate 7 and the upper wall of the lower mold base 1.

[0023] The upper wall of the lower mold base 1 is also equipped with a positioning support 14 for fixing the rear end of the square tube.

[0024] The upper die holder 11 is mounted with a die handle 13 on its upper wall by an internal hex bolt. The upper die holder 11 is fixed to the punch press by the die handle 13 and moves together with the slide block on the punch press.

[0025] The stripper plate 6 and the die 4 are made of CR12; the heat treatment hardness is HRC52-54; the clearance of the stripper plate 6 is +0.1mm and the clearance of the punch 12 is +0.05mm.

[0026] In practical use, the cutting die achieves the cutting of the square tube through the relative movement of the upper die holder 11 and the lower die holder 1. First, the square tube to be stamped is placed in the limiting groove 1 in the lower die holder 1. The positioning support 14 supports the rear end of the square tube. The upper die holder 11 is fixed to the punch press by the die handle 13. The slider on the punch press drives the upper die holder 11. When the upper die holder 11 moves down, it drives the fixing plate 10 to move down, and drives the back plate 7 to move down through the stripper pin 8 and the spring 9. The back plate 7 drives the stripper plate 6 to move down, and the fixing plate 10 drives the punch 12 to move down. The stripper plate 6 moves to the upper end of the square tube, and the upper end of the square tube is inserted into the limiting groove 2. The stripper plate 6 and the lower die holder 1 fix the cutting position of the square tube. As the upper die holder 11 moves down, the cutting die 11 moves to the lower die holder 12. As the die continues to move downward, the back plate 7 stops moving under the action of the stripper plate 6, the spring 9 is compressed, and the lower end of the stripper pin 8 extends out of the back plate 7. The punch 12 enters the cavity formed by the stripper plate 6 and the die 4 and punches the tube placed on the die 4. The punch 12 continues to move downward and punches the tube scrap into the cutting edge of the die 4, completing the cutting of the square tube. When the punch 12 moves upward with the punch press slide, the stripper plate 6 still fixes the square tube to prevent the square tube from moving upward with the punch 12. At this time, the spring 9 gradually recovers from the compressed state until the stripper plate 6 moves upward together under the action of the stripper pin 8, detaching from the fixation of the square tube, completing one punching stroke. The cut scrap is pressed into a V shape by the punch 12 and discharged from the ejector groove of the die 4.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents. In conclusion, if those skilled in the art, inspired by this description, design similar structural methods and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A square tube blanking die structure characterized by comprising: The device includes a lower die base, an upper die base, a die cavity, and a punch. The lower die base is located at the lower end of the upper die base. The die cavity is mounted on the upper wall of the lower die base via a cylindrical pin. A fixing plate is installed on the bottom wall of the upper die base via hexagonal socket bolts. The punch is located on the side wall of the fixing plate. A punching head is provided at the lower end of the punch. A limiting groove is provided on the upper wall of the die cavity. The punching head is matched with the limiting groove.

2. The square tube cutting mold structure according to claim 1, characterized in that, The bottom wall of the upper mold base is also equipped with a stripper pin, and a backing plate is movably installed at the lower end of the stripper pin. A spring is installed between the backing plate and the bottom wall of the upper mold base, and the spring is sleeved on the outside of the stripper pin.

3. The square tube cutting mold structure according to claim 2, characterized in that, The bottom wall of the back panel is equipped with a discharge plate, and the lower end of the discharge plate is provided with a limiting groove 2. The limiting groove 2 is located at the upper end of the limiting groove 1. The lower end and upper end of the square tube are respectively engaged in the limiting groove 1 and the limiting groove 2.

4. The square tube cutting mold structure according to claim 3, characterized in that, Guide sleeves are installed on both the upper and lower walls of the backing plate. A guide post is installed between the guide sleeve on the upper wall of the backing plate and the bottom wall of the upper mold base. A guide post is installed between the guide sleeve on the bottom wall of the backing plate and the upper wall of the lower mold base.

5. The square tube cutting mold structure according to claim 1, characterized in that, The upper wall of the lower mold base is also equipped with a positioning support.

6. The square tube cutting mold structure according to claim 1, characterized in that, The upper mold base has a mold handle installed on its upper wall via hexagonal socket bolts.

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