Nitrogen spring mounting structure and stamping die

Abstract

The utility model discloses a nitrogen spring mounting structure and a stamping die, comprising a blind hole which is recessed in a cover plate, and the bottom surface of the blind hole is a closed surface; the nitrogen spring is coaxially arranged in the blind hole, the inner diameter of the blind hole is larger than the outer diameter of the nitrogen spring, the inner diameter of the blind hole is 1.005 times smaller than the outer diameter of the nitrogen spring, and the difference between the inner diameter of the blind hole and the outer diameter of the nitrogen spring is smaller than 0.3 mm; the depth of the blind hole is not smaller than the axial length of the nitrogen spring, one end of the nitrogen spring is in coaxial contact with a bolt, and the sum of the axial length of the nitrogen spring and the bolt is larger than the depth of the blind hole. The bottom face of the blind hole is used as a closed face, compared with the prior art, a screw through hole is omitted in the cover plate, and machining time is saved. In addition, the diameter numerical relationship between the nitrogen spring and the blind hole is determined, the nitrogen spring is installed in the blind hole, the unilateral gap is small, and stability is good.

Description

Technical Field

[0001] The utility model relates to the field of nitrogen spring installation, in particular to a nitrogen spring installation structure and a stamping die. Background Art

[0002] Nitrogen spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It has a small size, large elastic force and long stroke. It can perform tasks that are difficult to accomplish with conventional elastic components such as metal springs, rubber and air cushions. It simplifies mold design and manufacturing and facilitates mold installation and adjustment.

[0003] A nitrogen spring structure of an existing embodiment is as follows Figure 1 As shown, the cover plate 1 is processed with a screw hole 5 for fixing one end of the nitrogen spring 3, and each nitrogen spring 3 is equipped with two screw holes 5. The hole for accommodating the nitrogen spring 3 on the cover plate 1 is roughly processed, and the accuracy is difficult to meet the working requirements of the nitrogen spring. A Φ50 nitrogen spring is processed with a Φ52.0 accommodating hole, with a single side +1.0mm. The stability of the nitrogen spring 3 is poor under this installation form.

[0004] The nitrogen spring 3 is a pressure source that does not require pre-stressing. If it is pre-stressed, it will cause assembly difficulties and reduce the life of the nitrogen spring. The pressure of the nitrogen spring 3 is generally more than four times that of the flat wire spring. The first disadvantage of the nitrogen spring structure of this implementation method in the workshop: the template processing features are complex, and it is best not to process the screw through hole 5. The second disadvantage: the hole on the cover plate 1 that accommodates the nitrogen spring 3 is rough-machined, and the accuracy cannot be guaranteed because the nitrogen spring does not need to be pre-stressed. If the hole is processed shallowly, the nitrogen spring 3 is pre-stressed; if the hole is processed deep, the pressing force of the nitrogen spring does not work. Therefore, the entire nitrogen spring installation structure needs to be further simplified and standardized. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a nitrogen spring installation structure and a stamping die. The bottom surface of the blind hole is used as a closed surface. Compared with the prior art, the cover plate eliminates the screw through hole, saving processing time. In addition, the numerical relationship between the diameter of the nitrogen spring and the blind hole is determined. The nitrogen spring is installed in the blind hole, with a small single-side gap and good stability.

[0006] In order to solve the above problems, the utility model provides a nitrogen spring installation structure and a stamping die. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0007] On the one hand, a nitrogen spring mounting structure includes: a blind hole, which is recessed in a cover plate, and the bottom surface of the blind hole is a closed surface; a nitrogen spring, which is coaxially arranged in the blind hole, the inner diameter of the blind hole is larger than the outer diameter of the nitrogen spring, the inner diameter of the blind hole is less than 1.005 times the outer diameter of the nitrogen spring, and the difference between the inner diameter of the blind hole and the outer diameter of the nitrogen spring is less than 0.3 mm; the depth of the blind hole is not less than the axial length of the nitrogen spring, one end of the nitrogen spring is coaxially contacted with a bolt, and the sum of the axial lengths of the nitrogen spring and the bolt is greater than the depth of the blind hole.

[0008] The beneficial effects of adopting the above technical solution are: the bottom surface of the blind hole is used as a closed surface. Compared with the existing technology, the cover plate eliminates the screw through hole, which saves processing time, simplifies the template processing features, and improves efficiency. At the same time, the nitrogen spring is not pre-stressed, which is convenient for installation and increases its life. In addition, the numerical relationship between the diameter of the nitrogen spring and the blind hole is determined. The nitrogen spring is installed in the blind hole with a small single-sided gap and good stability. The blind hole is processed according to the high value of the nitrogen spring to ensure its simultaneous operation. When used in the mold, all parts are subjected to force at the same time, reducing template deformation and improving precision. The bolts are used to equivalently extend the axial length of the nitrogen spring.

[0009] As a further improvement of the present invention, the outer diameter of the nitrogen spring is in the range of 45 mm to 55 mm, and the inner diameter of the blind hole is 0.2 mm larger than the outer diameter of the nitrogen spring.

[0010] The beneficial effect of adopting the above technical solution is that the blind holes on the cover plate can be processed by CNC or other high-precision machining.

[0011] As a further improvement of the present invention, the outer diameter of the nitrogen spring is 50 mm, and the inner diameter of the blind hole is 50.2 mm.

[0012] The beneficial effect of adopting the above technical solution is: a Φ50 nitrogen spring is processed into a Φ50.2 mounting hole, with a single side +0.1mm, and the nitrogen spring is fixed in the blind hole of the mold and is not easy to shake. No additional screws are required to fix it.

[0013] As a further improvement of the utility model, the vertical distance from the bottom surface of the blind hole to the adjacent side of the cover plate is 25 mm.

[0014] As a further improvement of the utility model, the bottom surface of the blind hole is a flat surface.

[0015] The beneficial effect of adopting the above technical solution is that the flat surface ensures a sufficiently stable contact surface with the shaft end of the nitrogen spring.

[0016] As a further improvement of the present invention, the surface roughness Ra of the bottom surface of the blind hole and the side surface of the blind hole is 0.6 um to 1.0 um.

[0017] As a further improvement of the present invention, the opening edge of the blind hole is chamfered.

[0018] The beneficial effect of adopting the above technical solution is that the chamfer makes it easier for the nitrogen spring to be installed into the blind hole.

[0019] On the other hand, the stamping die includes the nitrogen spring mounting structure mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an implementation method of the prior art;

[0022] Figure 2 It is a structural schematic diagram of an implementation mode of the utility model;

[0023] Figure 3 It is a structural schematic diagram of another implementation mode of the utility model.

[0024] 1-cover plate; 11-blind hole; 12-chamfer; 2-gap; 3-nitrogen spring; 31-spring body; 32-spring rod; 4-bolt; 5-screw hole; A-bottom thickness spacing; B-spring outer diameter; C-blind hole inner diameter; D-blind hole depth. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0026] In order to achieve the purpose of the utility model, a nitrogen spring installation structure includes: a blind hole 11, which is recessed on a cover plate 1, and the bottom surface of the blind hole 11 is a closed surface; a nitrogen spring 3, which is coaxially arranged in the blind hole 11, the inner diameter of the blind hole 11 is greater than the outer diameter of the nitrogen spring 3, the inner diameter of the blind hole 11 is less than 1.005 times the outer diameter of the nitrogen spring 3, and the difference between the inner diameter of the blind hole 11 and the outer diameter of the nitrogen spring 3 is less than 0.3mm; the depth of the blind hole 11 (i.e., the blind hole depth D) is not less than the axial length of the nitrogen spring 3, one end of the nitrogen spring 3 is coaxially contacted with a bolt 4, and the sum of the axial lengths of the nitrogen spring 3 and the bolt 4 is greater than the depth of the blind hole 11.

[0027] The cover plate 1 is made of die steel. The nitrogen spring 3 includes a spring body 31 and a spring rod 32. The outer diameter of the spring body 31 is larger than the outer diameter of the spring rod 32. The spring rod 32 performs axial telescopic movement relative to the blind hole 11. The depth of the blind hole 11 can be precisely milled according to the depth of the nitrogen spring 3 1:1; no pre-compression is performed, and installation is convenient.

[0028] The beneficial effects of adopting the above technical solution are: the bottom surface of the blind hole is used as the closed surface. Compared with the existing technology, the cover plate eliminates the screw holes, which saves processing time, simplifies the template processing features, and improves efficiency. At the same time, the nitrogen spring is not pre-stressed, which is convenient for installation and increases its life. In addition, the numerical relationship between the diameter of the nitrogen spring and the blind hole is determined. The nitrogen spring is installed in the blind hole with a small single-sided gap and good stability. The blind hole is processed according to the high value of the nitrogen spring to ensure its simultaneous operation. When used in the mold, all parts are subjected to force at the same time, reducing template deformation and improving precision.

[0029] In other embodiments of the present invention, the outer diameter of the nitrogen spring 3 is in the range of 45 mm to 55 mm, and the inner diameter of the blind hole 11 is 0.2 mm larger than the outer diameter of the nitrogen spring 3. That is, the size of the gap 2 on both sides is 0.1 mm. Figure 2 As shown, the outer diameter of the nitrogen spring 3 is 50 mm, that is, the outer diameter B of the spring is 50 mm. The inner diameter of the blind hole 11 is 50.2 mm, that is, the inner diameter C of the blind hole is 50.2 mm.

[0030] The beneficial effect of adopting the above technical solution is that the blind hole on the cover plate can be processed by CNC and other high precision machining. A Φ50 nitrogen spring can be processed into a Φ50.2 mounting hole, with a single side +0.1mm. The nitrogen spring is fixed in the blind hole of the mold and is not easy to shake. No additional screws are required for fixing.

[0031] like Figure 2 As shown, in other embodiments of the present invention, the vertical distance from the bottom surface of the blind hole 11 to the adjacent side of the cover plate 1 is 25 mm, that is, the bottom thickness spacing A is 25 mm.

[0032] In other embodiments of the present invention, the bottom surface of the blind hole 11 is a flat surface.

[0033] The beneficial effect of adopting the above technical solution is that the flat surface ensures a sufficiently stable contact surface with the shaft end of the nitrogen spring.

[0034] In some other embodiments of the present invention, the surface roughness Ra of the bottom surface of the blind hole 11 and the side surface of the blind hole 11 is 0.6 um to 1.0 um.

[0035] like Figure 3 As shown, in some other embodiments of the present invention, the opening edge of the blind hole 11 has a chamfer 12 .

[0036] The beneficial effect of adopting the above technical solution is that the chamfer makes it easier for the nitrogen spring to be installed into the blind hole.

[0037] The stamping die includes the nitrogen spring mounting structure mentioned above. The nitrogen spring mounting structure is arranged on the facing surfaces of the movable parts in the stamping die. The axial length of the nitrogen spring 3 is parallel to the direction of the linear mechanical freedom of the stamping die. The nitrogen spring 3 cannot be installed in the stamping die in the air.

[0038] Figure 2 is Figure 1 Innovative improvements based on. Figure 3 is Figure 2 improvements based on .

[0039] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A nitrogen spring installation structure, characterized in that: include: A blind hole is recessed in the cover plate, and the bottom surface of the blind hole is a closed surface; A nitrogen spring is coaxially arranged in a blind hole, wherein the inner diameter of the blind hole is larger than the outer diameter of the nitrogen spring, the inner diameter of the blind hole is smaller than 1.005 times the outer diameter of the nitrogen spring, and the difference between the inner diameter of the blind hole and the outer diameter of the nitrogen spring is less than 0.3 mm; The depth of the blind hole is not less than the axial length of the nitrogen spring, one end of the nitrogen spring is coaxially contacted with a bolt, and the sum of the axial lengths of the nitrogen spring and the bolt is greater than the depth of the blind hole.

2. The nitrogen spring installation structure according to claim 1, characterized in that: The outer diameter of the nitrogen spring ranges from 45 mm to 55 mm, and the inner diameter of the blind hole is 0.2 mm larger than the outer diameter of the nitrogen spring.

3. The nitrogen spring installation structure according to claim 1, characterized in that: The outer diameter of the nitrogen spring is 50 mm, and the inner diameter of the blind hole is 50.2 mm.

4. The nitrogen spring installation structure according to claim 1, characterized in that: The vertical distance from the bottom surface of the blind hole to the adjacent side of the cover plate is 25 mm.

5. The nitrogen spring installation structure according to claim 1, characterized in that: The bottom surface of the blind hole is a flat surface.

6. The nitrogen spring installation structure according to claim 1, characterized in that: The surface roughness Ra of the bottom surface and the side surface of the blind hole is 0.6um to 1.0um.

7. The nitrogen spring installation structure according to claim 1, characterized in that: The opening edge of the blind hole is chamfered.

8. Stamping die, characterized in that: The invention comprises a nitrogen spring mounting structure as claimed in any one of claims 1 to 7.

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