Bolt sleeve applied to storage battery box assembly

Abstract

According to the cold heading forming process of the bolt sleeve applied to the storage battery box assembly, the screw sleeve part and the nut sleeve part of the sleeve body are integrally formed in a cold heading mode, compared with the prior art, the sleeve body formed through the cold heading forming process is higher in structural strength and not prone to deformation, welding procedures are reduced, production efficiency is improved, and production cost is reduced. And the transition connecting part arranged on the sleeve body can play a role in positioning and guiding when the bolt enters the sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt sleeves, in particular to a cold heading forming process of a bolt sleeve applied to a battery box assembly. Background Art

[0002] The existing bolt sleeves used in the battery box assembly are usually formed by welding, that is, the sleeve is used to install the nut and the screw rod, which is time-consuming and labor-intensive in the production process and has low production efficiency. Summary of the invention

[0003] In view of this, the utility model provides a cold heading forming process for a bolt sleeve of a battery box assembly.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A bolt sleeve used in a battery box assembly comprises a sleeve body, wherein the sleeve body has a screw sleeve portion and a nut sleeve portion, wherein the nut sleeve portion extends toward one side of the screw sleeve portion to form a transition connection portion corresponding to the screw sleeve portion, and the transition connection portion is integrally formed with the screw sleeve portion.

[0006] Preferably, the nut sleeve portion has a nut portion and a limiting connection portion, the nut portion is arranged between the transition connection portion and the limiting connection portion, the nut sleeve portion is provided with a nut mounting groove penetrating the transition connection portion and the nut portion, the screw sleeve portion is provided with a screw mounting groove, the nut mounting groove has a nut mounting portion and a transition connection portion corresponding to the nut portion and the transition connection portion, and the inner diameter of the transition connection portion is the same as the inner diameter of the screw mounting groove.

[0007] Preferably, the limiting connection portion is formed by extending from the side of the nut portion away from the transition connection portion toward the direction away from the center of the nut portion, an external step structure is provided on the side of the limiting connection portion away from the nut portion, and an external chamfered portion is provided on the edge of the limiting connection portion, the chamfering angle of the external chamfered portion is 45°, and the width of the external chamfered portion is 1±0.2mm.

[0008] Preferably, a groove wall on one side of the transition connection portion close to the nut mounting portion is concave to form a limit mounting portion, and the limit mounting portion is arranged in a multi-step structure.

[0009] Preferably, the limiting mounting portion includes a first stepped mounting portion and a second stepped mounting portion, the inner diameter of the first stepped mounting portion is larger than the inner diameter of the second stepped mounting portion, and the first stepped mounting portion is arranged on a side of the second stepped mounting portion close to the nut mounting portion.

[0010] Preferably, the screw sleeve portion has a large diameter portion and a small diameter portion, the outer diameter of the large diameter portion is the same as the outer diameter of the transition connection portion, the inner diameters of the large diameter portion and the small diameter portion are the same, and the outer diameter of the large diameter portion is larger than the inner diameter of the small diameter portion.

[0011] Preferably, an inclined connection portion is provided between the outer wall of the large diameter portion and the outside of the small diameter portion, and two ends of the inclined connection portion are respectively connected to the large diameter portion and the small diameter portion.

[0012] A cold heading forming process for a bolt sleeve of a battery box assembly includes the following steps:

[0013] Step 1: Cutting: Cut the coil wire and straighten it through the straightening machine, and then enter the cold heading equipment;

[0014] Step 2: Extrusion and closing lock: The sheared material is sent to the gate of the first-order main mold through the conveying and clamping device, and the first-order punching die is moved; the punching rod pushes the blank into the first-order main mold and extrudes it into the shape of the main mold cavity;

[0015] Step 3: Head upsetting: The first-order blank is transferred to the second-order main die through the material clamping and conveying device, and the first-order blank is upset and formed in the second-order punching die. The first-order rod blank is expanded in the cavity of the second-order main die through the head upsetting and extrusion;

[0016] Step 4: Head shaping and hole drawing: The second-order blank is sent to the third-order main die through the material clamping and conveying device, and the third-order punch die is moved to form the head. The second-order rod blank is expanded in the cavity of the third-order main die through the head forming extrusion, and the nut sleeve part is formed under the impact of the third-order punch rod;

[0017] Step 5: Hole forming and fixing: The three-sequence blank is sent to the four-sequence main die through the clamping conveyor, and the four-sequence punching die is moved to form the hole, so that the hole depth of the three-sequence blank is deepened;

[0018] Step 6: Send the four-sequence blank to the five-sequence main mold through the material clamping and conveying device, and move the five-sequence punching die to form the hexagonal inner corner;

[0019] Step 7: Inner hole forming: The five-sequence blank is sent to the six-sequence main mold through the material clamping and conveying device, and the six-sequence punching die is moved to form the inner hole.

[0020] The beneficial effect of the utility model is that the screw sleeve part and the nut sleeve part of the sleeve body are integrally formed by cold heading. Compared with the prior art, the sleeve body after forming in this design has higher structural strength and is not easy to deform. It also reduces the welding procedure and improves production efficiency. The setting of the transition connection part on the sleeve body can play a positioning and guiding role for the bolt to enter the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Attached Figure 1 It is a schematic diagram of the sleeve body structure;

[0023] Attached Figure 2 This is a schematic diagram of step 2;

[0024] Attached Figure 3 This is a schematic diagram of step three;

[0025] Attached Figure 4 This is a schematic diagram for step 4:

[0026] Attached Figure 5 This is a schematic diagram of step five;

[0027] Attached Figure 6 This is a schematic diagram of step six;

[0028] Attached Figure 7 This is a schematic diagram of step seven. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0031] The utility model provides the following technical solutions:

[0032] As attached Figure 1-7As shown, the utility model discloses a bolt sleeve applied to a battery box assembly, including a sleeve body 1, wherein the sleeve body 1 has a screw sleeve portion 2 and a nut sleeve portion 3, wherein the nut sleeve portion 3 extends toward one side of the screw sleeve portion 2 to form a transition connection portion 4 corresponding to the screw sleeve portion 2, and the transition connection portion 4 is integrally formed with the screw sleeve portion 2. Specifically, in the present design, the screw sleeve portion 2 and the nut sleeve portion 3 of the sleeve body 1 are integrally formed by cold heading. Compared with the prior art, the sleeve body 1 after forming in the present design has a higher structural strength, is less prone to deformation, reduces welding procedures, and improves production efficiency. The provision of the transition connection portion 4 on the sleeve body 1 can play a role in positioning and guiding the bolts entering the sleeve.

[0033] Specifically, in the present design, the sleeve body 1 is suitable for bolts corresponding to the shape of the inner wall of the sleeve.

[0034] Further, the nut sleeve portion 3 has a nut portion 5 and a limiting connection portion 6, the nut portion 5 is arranged between the transition connection portion 4 and the limiting connection portion 6, the nut sleeve portion 3 is provided with a nut installation slot 7 penetrating the transition connection portion 4 and the nut portion 5, the screw sleeve portion 2 is provided with a screw installation slot 8, the nut installation slot 7 has a nut installation portion 16 and a transition connection portion 4 corresponding to the nut portion 5 and the transition connection portion 4, and the inner diameter of the transition connection portion 4 is the same as the inner diameter of the screw installation slot 8. Specifically, in this embodiment, the limiting connection portion 6 of the nut sleeve portion 3 can limit the position of the sleeve body 1 on the battery box assembly after the battery box assembly is installed, so as to avoid the installation position being too deep, which makes it difficult to remove the sleeve body 1 and the bolts installed in the sleeve body 1 from the battery box assembly; the setting of the transition connection portion 4 can provide a positioning function for the installation of the bolt and the sleeve.

[0035] Furthermore, the position-limiting connection part 6 is formed by extending from the side of the nut part 5 away from the transition connection part 4 toward the center of the nut part 5, and an outer step structure 15 is provided on the side of the position-limiting connection part 6 away from the nut part 5, and an outer chamfered part 16 is provided on the edge of the position-limiting connection part 6, the chamfering angle of the outer chamfered part 16 is 45°, and the width of the outer chamfered part 16 is 1±0.2mm. Specifically, in this embodiment, by providing the outer step structure 15, the position-limiting connection part 6 can have multiple step surfaces, and corresponding step structures are provided on the battery box assembly corresponding to the multiple step surfaces of the outer step structure 15, thereby increasing the contact area between the two, improving the connection stability, and extending the path for the leakage of the medium in the battery box assembly, thereby increasing the sealing performance.

[0036] Furthermore, the groove wall of one side of the transition connection portion 4 close to the nut mounting portion 16 is concave to form a limit mounting portion 9, and the limit mounting portion 9 is arranged in a multi-level stepped structure. Specifically, in this embodiment, the limit mounting portion 9 is arranged in a two-level stepped structure, and the limit mounting portion 9 of the stepped structure can increase the contact area with the bolt, improve the sealing performance, and can also adapt to the bolt, and can play a role in positioning the bolt during the installation of the bolt and the sleeve body 1, preventing the bolt from swinging inside the sleeve body 1.

[0037] Furthermore, the limiting mounting portion 9 includes a first stepped mounting portion 10 and a second stepped mounting portion 11 , the inner diameter of the first stepped mounting portion 10 is larger than the inner diameter of the second stepped mounting portion 11 , and the first stepped mounting portion 10 is arranged on a side of the second stepped mounting portion 11 close to the nut mounting portion 16 .

[0038] Furthermore, the screw sleeve portion 2 has a large diameter portion 12 and a small diameter portion 13, the outer diameter of the large diameter portion 12 is the same as the outer diameter of the transition connection portion 4, the inner diameters of the large diameter portion 12 and the small diameter portion 13 are the same, and the outer diameter of the large diameter portion 12 is larger than the inner diameter of the small diameter portion 13. Specifically, an inclined connection portion 14 is provided between the outer wall of the large diameter portion 12 and the outside of the small diameter portion 13, and the two ends of the inclined connection portion 14 are connected to the large diameter portion 12 and the small diameter portion 13, respectively. Specifically, in the present design, the inclined connection portion 14 provided between the large diameter portion 12 and the small diameter portion 13 on the screw sleeve portion 2 can increase the contact area with the installation position on the battery box assembly, thereby improving the sealing performance.

[0039] Step 1: Cutting: The coil wire with a diameter of 33mm passes through the straightening machine and enters the cold heading equipment, and the cutting length is 119.4mm;

[0040] Step 2: Extrusion and closing lock: send the cut material to the gate of the first-order main die through the conveying and clamping device, move the punching rod of the first-order die to push the blank into the first-order main die and extrude it into the shape of the inner cavity of the main die. The thick rod of the head is φ33.2mm and the thin rod is φ25.7mm;

[0041] Step 3: The first-order blank is transferred to the second-order main die through the material clamping and conveying device, and the first-order blank is moved to the second-order punch die to be upset and formed. The first-order rod blank is expanded in the second-order main die cavity through the head upsetting and extrusion, and the rod diameter expands to φ25.75mm;

[0042] Step 4: The second-order blank is sent to the third-order main mold through the material clamping conveyor, and the third-order punch die is moved to form the head. The diameter of the head thick rod is φ62mm, and the diameter of the step under the head is φ48.5mm. The second-order rod blank is expanded in the cavity of the third-order main mold through head forming extrusion, and the rod diameter expands to φ25.85mm. Under the impact of the third-order punch rod, a nut sleeve part 3 with a nut mounting hole is formed. The diameter of the nut mounting hole is φ35.52mm and the depth is 16.9mm.

[0043] Step 5: Hole forming and fixing: The three-sequence blank is sent to the four-sequence main die through the clamping conveyor, and the four-sequence punching die is moved to form the hole, so that the hole depth of the three-sequence blank is deepened to 21.9mm, the diameter is reduced from φ35.52mm to φ35.2mm, the diameter of the head thick rod is expanded to φ65mm, the step under the head is expanded to φ48.8mm, and the rod diameter is expanded to φ25.95mm;

[0044] Step 6: Hexagonal inner corner forming: The four-sequence blank is sent to the five-sequence main die through the clamping conveyor, and the five-sequence punch die is moved to form the hexagonal inner corner. The hexagonal opposite side: S: 17.2, the depth is deepened to 34.35mm, the diameter is reduced from φ35.2mm to φ35mm, the step under the head is enlarged to φ49.2mm, and the diameter of the rod is expanded to φ26.05mm;

[0045] Step 7: Inner hole forming, the five-sequence blank is sent to the six-sequence main mold through the clamping conveyor, and the six-sequence punching die is moved to form the inner hole. The inner hole length is 50mm and the inner hole diameter is φ14.5mm. Then the sleeve body 1 is formed.

[0046] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bolt sleeve for a battery box assembly, comprising a sleeve body, characterized in that: The sleeve body comprises a screw sleeve portion and a nut sleeve portion, wherein the nut sleeve portion extends toward one side of the screw sleeve portion to form a transition connection portion corresponding to the screw sleeve portion, and the transition connection portion is integrally formed with the screw sleeve portion.

2. The bolt sleeve for battery box assembly according to claim 1, characterized in that: The nut sleeve portion comprises a nut portion and a limiting connection portion, the nut portion is arranged between the transition connection portion and the limiting connection portion, the nut sleeve portion is provided with a nut mounting through groove penetrating the transition connection portion and the nut portion, the screw sleeve portion is provided with a screw mounting through groove, the nut mounting through groove comprises a nut mounting portion and a transition connection portion corresponding to the nut portion and the transition connection portion, and the inner diameter of the transition connection portion is the same as the inner diameter of the screw mounting through groove.

3. The bolt sleeve for battery box assembly according to claim 2 is characterized in that: The limiting connection portion is formed by extending from the side of the nut portion away from the transition connection portion toward the direction away from the center of the nut portion, an external step structure is arranged on the side of the limiting connection portion away from the nut portion, and an external chamfered portion is arranged on the edge of the limiting connection portion, the chamfering angle of the external chamfered portion is 45°, and the width of the external chamfered portion is 1±0.2mm.

4. The bolt sleeve for battery box assembly according to claim 2 is characterized in that: A groove wall on one side of the transition connection portion close to the nut mounting portion is concave to form a limit mounting portion, and the limit mounting portion is arranged in a multi-step structure.

5. The bolt sleeve used in the battery box assembly according to claim 4 is characterized in that: The position limiting mounting portion includes a first stepped mounting portion and a second stepped mounting portion, the inner diameter of the first stepped mounting portion is larger than the inner diameter of the second stepped mounting portion, and the first stepped mounting portion is arranged on a side of the second stepped mounting portion close to the nut mounting portion.

6. The bolt sleeve for battery box assembly according to claim 1, characterized in that: The screw sleeve portion has a large diameter portion and a small diameter portion, the outer diameter of the large diameter portion is the same as the outer diameter of the transition connection portion, the inner diameters of the large diameter portion and the small diameter portion are the same, and the outer diameter of the large diameter portion is larger than the inner diameter of the small diameter portion.

7. The bolt sleeve used in the battery box assembly according to claim 6 is characterized in that: An inclined connection portion is arranged between the outer wall of the large diameter portion and the outside of the small diameter portion, and two ends of the inclined connection portion are respectively connected to the large diameter portion and the small diameter portion.

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