Bolt clamping device for bolt warm rolling process

Abstract

The utility model relates to a bolt clamping device for bolt warm rolling process, which comprises a clamping mechanism, an operating mechanism and a locking mechanism, the clamping mechanism comprises a first clamping block and a second clamping block which are oppositely arranged, and an axial limiting groove and a first radial limiting groove are arranged in the first clamping block; an avoiding accommodating groove and a second radial limiting groove are formed in the second clamping block; the first clamping block and the second clamping block are both made of GH4169 of HRC35-40. The first clamping block and the second clamping block are made of GH4169 of HRC35-40. The operating mechanism is connected with the first clamping block and the second clamping block and can drive the first clamping block and the second clamping block to be separated or folded to a clamping state; when the clamping mechanism is in a clamping state and clamps the bolt, the polished shaft rod section is located in the first radial limiting groove and the second radial limiting groove and keeps abutting against the first radial limiting groove and the second radial limiting groove, the polished shaft rod section extends out of the first radial limiting groove and the second radial limiting groove, and the nut is located in the axial limiting groove and the avoiding containing groove.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt processing, in particular to a bolt clamping device used in a bolt warm rolling process. Background Art

[0002] The traditional processing route of precision bolts is "material collection-turning-grinding-hot upsetting-solid solution-turning-milling-fitting-milling-fitting-aging-grinding-thread rolling-fitting-inspection". After solution and aging heat treatment, the outer circle of the long shaft section is ground to attach Figure 1 Taking a certain precision bolt in as an example, the outer circle straightness of the screw part is required to meet φ0.036, the outer circle diameter is φ5.2 (-0.01, -0.022), the part grinding process has high dimensional accuracy, and the grinding is difficult. After grinding, the pressure rod part is rolled thread. It can be seen from the process route that solid solution and aging heat treatment are required before rolling the thread. This heat treatment is an overall heat treatment. The disadvantages are that the heat treatment processing time is long, the surface is easily oxidized to produce oxidation color and oxide scale, and the surface needs to be ground after heat treatment before rolling the thread. Secondly, it can be seen from the material properties that if the temperature is high or the insulation time is too long during the heat treatment process, it will cause irreversible phenomena such as coarse grain size of the material structure, which will lead to structural defects in the process of rolling thread, and the quality of parts cannot be effectively controlled, which greatly affects the delivery of parts.

[0003] At present, a method of using warm rolling process has been proposed. Instead of grinding process before rolling, high-frequency local heat treatment is used to effectively connect the process of heat treatment of parts with rolling thread, thereby improving the efficiency of parts processing. Rolling the parts under suitable temperature conditions can reduce defects such as cracks and folds caused by cold working stress during extrusion to a certain extent, so as to ensure the qualified rate of parts. In the warm rolling process, the bolts are required to remain stable and rotate freely, and existing conventional tools are difficult to meet the use requirements. Therefore, it is necessary to design a rolling device with heat insulation function and simple and lightweight structure. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a bolt clamping device for a bolt warm rolling process, which can stably clamp the bolts in the warm rolling process and enable the bolts to rotate, and is flexible and simple to operate.

[0005] To achieve the above-mentioned purpose, the utility model provides a bolt clamping device for a bolt warm rolling process, the bolt comprising a nut and a screw portion, the screw portion being provided with an optical axis rod section and a threaded rod section in sequence from one end connected to the nut to the other end, the bolt clamping device comprising a clamping mechanism, an operating mechanism and a locking mechanism, the clamping mechanism comprising a first clamping block and a second clamping block arranged opposite to each other, an axial limiting groove and a first radial limiting groove being provided in the first clamping block, the first radial limiting groove being a partial cylindrical hole with a central angle less than 180°, and its radius being equal to the outer diameter of the optical axis rod section, the two ends of the first radial limiting groove being connected to the axial limiting groove and the outer surface of the first clamping block respectively, the side surfaces at the two ends of the axial limiting groove being parallel and perpendicular to the axis of the first radial limiting groove, the spacing between the side surfaces at the two ends of the axial limiting groove being equal to the thickness of the nut; an avoidance accommodating groove and a second radial limiting groove being provided in the second clamping block, the second radial limiting groove being a partial cylindrical hole with a central angle less than 180°, And its inner diameter is equal to the outer diameter of the optical axis rod segment, the two ends of the second radial limit groove are respectively connected to the avoidance accommodating groove and the outer surface of the second clamping block, and the axial width of the avoidance accommodating groove in the second radial limit groove is greater than the thickness of the nut; the material of the first clamping block and the second clamping block is GH4169 with HRC35-40; the operating mechanism is connected to the first clamping block and the second clamping block, and can drive the first clamping block and the second clamping block to separate or close to the clamping state, when the first clamping block and the second clamping block are in the clamping state, the first radial limit groove and the second radial limit groove are coaxial, and the axial limit groove and the avoidance accommodating groove are aligned; the locking mechanism can lock and fix the first clamping block and the second clamping block in the clamping state; when the clamping mechanism is in the clamping state and clamps the bolt, the optical axis rod segment is located in the first radial limit groove and the second radial limit groove, and extends out of the first radial limit groove and the second radial limit groove, and the nut is located in the axial limit groove and the avoidance accommodating groove.

[0006] Furthermore, the locking mechanism includes a locking screw, a first locking threaded hole is provided on the first clamping block, and a second locking threaded hole is provided on the second clamping block. When the first clamping block and the second clamping block are in a clamping state, the first locking threaded hole and the second locking threaded hole are aligned, and the locking screw is threaded into the first locking threaded hole and the second locking threaded hole.

[0007] Furthermore, the operating mechanism includes two pliers bodies and a pliers shaft, the two pliers bodies are rotatably connected through the pliers shaft, the parts of the pliers bodies located on both sides of the pliers shaft are respectively a handle part and a connecting part, and the first clamping block and the second clamping block of the clamping mechanism are respectively fixedly connected to the connecting parts of the two pliers bodies.

[0008] Furthermore, the handle portion of the pliers body is wrapped with a heat insulating protective cover.

[0009] Furthermore, the thermal insulation protective cover is made of high temperature resistant glass fiber.

[0010] Furthermore, a closing limit block is respectively provided on the two clamp bodies of the operating mechanism, and when the two clamp bodies rotate until the two closing limit blocks abut against each other, the first clamping block and the second clamping block are in a clamping state.

[0011] Furthermore, the axial limiting groove in the first clamping block is a partial cylindrical hole with a central angle less than 180°, and is coaxially arranged with the first radial limiting groove.

[0012] Furthermore, the avoidance accommodating groove in the second clamping block is a partial cylindrical hole with a central angle less than 180°, and is coaxially arranged with the second radial limiting groove.

[0013] As described above, the bolt clamping device of the utility model has the following beneficial effects:

[0014] By setting a clamping mechanism, an operating mechanism and a locking mechanism, the clamping mechanism can stably clamp the bolt in the warm rolling process, and the bolt can rotate smoothly, solving the problem of part clamping and positioning in the bolt rolling process, so that local high-temperature heat treatment and thread rolling processing of the bolt can be continuously performed, meeting the use needs in the warm rolling process; the whole device has a simple structure, flexible and convenient operation, and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the bolt structure.

[0016] Figure 2 It is a structural schematic diagram of the bolt clamping device of the utility model.

[0017] Figure 3 for Figure 2 Middle top view.

[0018] Figure 4 It is a structural schematic diagram of the first clamping block in the utility model.

[0019] Figure 5 for Figure 4 AA section view in.

[0020] Figure 6 It is a schematic structural diagram of the second clamping block in the utility model.

[0021] Description of Figure Numbers

[0022] 1 Bolt

[0023] 11 Nut

[0024] 12 Optical axis rod section

[0025] 13 Threaded rod segment

[0026] 2 Clamping mechanism

[0027] 21 First clamping block

[0028] 211 Axial limit groove

[0029] 212 first radial limiting groove

[0030] 22 Second clamping block

[0031] 221 Avoidance and accommodation slot

[0032] 222 second radial limiting groove

[0033] 3 Operating mechanism

[0034] 31 Clamp body

[0035] 311 handle part

[0036] 312 Connection

[0037] 32 Clamp shaft

[0038] 4 Locking screw DETAILED DESCRIPTION

[0039] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figures 1 to 6 As shown, the utility model provides a bolt clamping device for a bolt warm rolling process. In the warm rolling process, the bolt 1 includes a nut 11 and a screw portion. The screw portion is provided with a smooth axis section 12 and a threaded section 13 in sequence from one end connected to the nut 11 to the other end. The threaded section 13 is used for processing external threads.

[0044] The bolt clamping device of the utility model comprises a clamping mechanism 2, an operating mechanism 3 and a locking mechanism. The clamping mechanism 2 comprises a first clamping block 21 and a second clamping block 22 arranged opposite to each other. An axial limiting groove 211 and a first radial limiting groove 212 are provided in the first clamping block 21. The first radial limiting groove 212 is used to accommodate the optical axis rod segment 12 of the bolt 1. The first radial limiting groove 212 is a partially cylindrical hole with a central angle less than 180°, and its inner diameter is equal to the outer diameter of the optical axis rod segment 12. The two ends of the first radial limiting groove 212 are respectively connected to the axial limiting groove 211 and the outer surface of the first clamping block 21, the side surfaces at both ends of the axial limiting groove 211 are parallel and perpendicular to the axis of the first radial limiting groove 212, and the spacing between the side surfaces at both ends of the axial limiting groove 211 is equal to the thickness of the nut 11; the second clamping block 22 is provided with an avoidance accommodating groove 221 and a second radial limiting groove 222, the second radial limiting groove 222 is also used to accommodate the optical axis rod segment 12 of the bolt 1, the second radial limiting groove 222 is a partial cylindrical hole with a central angle less than 180°, and its inner diameter is equal to the outer diameter of the optical axis rod segment 12, and the second radial limiting groove The two ends of the groove 222 are respectively connected to the avoidance accommodating groove 221 and the outer surface of the second clamping block 22; the axial width of the avoidance accommodating groove 221 is greater than the thickness of the nut 11; the material of the first clamping block 21 and the second clamping block 22 is GH4169 with HRC35-40; the operating mechanism 3 is connected to the first clamping block 21 and the second clamping block 22, and can drive the first clamping block 21 and the second clamping block 22 to separate or close to the clamping state. When the first clamping block 21 and the second clamping block 22 are in the clamping state, the first radial The limiting groove 212 and the second radial limiting groove 222 are coaxial, and the axial limiting groove 211 and the avoidance accommodating groove 221 are aligned; the locking mechanism can lock and fix the first clamping block 21 and the second clamping block 22 in the clamping state; when the clamping mechanism 2 is in the clamping state and clamps the bolt 1, the optical axis rod segment 12 is located in the first radial limiting groove 212 and the second radial limiting groove 222, and extends out of the first radial limiting groove 212 and the second radial limiting groove 222, and the nut 11 is located in the axial limiting groove 211 and the avoidance accommodating groove 221.

[0045] The basic working principle of the bolt clamping device involved in the utility model is as follows: the bolt clamping device is used to clamp the bolt 1 for a warm rolling process. In the warm rolling process, the screw portion of the bolt 1 needs to be inserted into the coil for high-frequency induction heating treatment, and then transferred to the rolling thread. When the bolt clamping device clamps the bolt 1, the first clamping block 21 and the second clamping block 22 of the clamping mechanism 2 are separated, and the bolt 1 is installed in the first clamping block 21, wherein the nut 11 is installed in the axial limiting groove 211, and the side surfaces at both ends of the nut 11 are in contact with the side surfaces at both ends of the axial limiting groove 211, thereby stabilizing the axial position of the bolt 1; the optical axis rod section 12 is located in the first radial limiting groove 212, and its outer peripheral surface is in contact with the arc-shaped groove surface of the first radial limiting groove 212. Then, the operating mechanism 3 can drive the first clamping block 21 and the second clamping block 22 to close to the clamping state, clamping the bolt 1, and the arc-shaped groove surfaces of the first radial limiting groove 212 and the second radial limiting groove 222 are respectively against the opposite sides of the optical axis rod segment 12, thereby stabilizing the position of the optical axis rod segment 12 and preventing it from moving radially. The avoidance accommodating groove 221 is covered on the nut 11, and there is a certain distance between the nut 11 to avoid collision and interference during the clamping process. At the same time, the arc-shaped groove surfaces of the first radial limiting groove 212 and the second radial limiting groove 222 are smooth surfaces, which do not affect the rotation of the bolt 1. After the first clamping block 21 and the second clamping block 22 clamp the bolt 1, the threaded rod segment 13 is completely located outside the clamping mechanism 2, and then the first clamping block 21 and the second clamping block 22 are locked and fixed by the locking mechanism, thereby ensuring that the clamping mechanism 2 can stably clamp the bolt 1, and at the same time does not affect the rotation of the bolt 1 and the processing of the threaded rod segment 13. After the bolt 1 is clamped, the position of the bolt 1 is stabilized and the warm rolling process is performed by holding the operating mechanism 3, which effectively solves the clamping and positioning problems of the bolt 1 in the warm rolling process. In addition, since the clamping mechanism 2 clamps the bolt 1 during the high-frequency heat treatment process, it will be affected by the heat dissipation of the induction heating coil, and the clamping block is made of GH4169 material with HRC35-40, which is wear-resistant and corrosion-resistant at high temperatures, avoiding the wear of the two clamping blocks caused by the frequent rolling friction of the bolt 1, avoiding affecting the clamping and positioning of the bolt 1, and ensuring the service life.

[0046] like Figures 1 to 5 As shown, the utility model is further described below with a specific embodiment:

[0047] In this embodiment, if Figure 3 As shown, as a preferred design, the locking mechanism includes a locking screw 4, a first locking threaded hole is provided on the first clamping block 21, and a second locking threaded hole is provided on the second clamping block 22. When the first clamping block 21 and the second clamping block 22 are in the clamping state, the first locking threaded hole and the second locking threaded hole are aligned, and the locking screw 4 is threaded into the first locking threaded hole and the second locking threaded hole, thereby locking and fixing the two clamping blocks.

[0048] like Figure 2 and Figure 3 As shown, in this embodiment, as a preferred design, the operating mechanism 3 adopts a clamp-type mechanism, including two clamp bodies 31 and a clamp shaft 32. The two clamp bodies 31 are rotatably connected through the clamp shaft 32. The two clamp bodies 31 are in a cross shape. The parts of the clamp bodies 31 located on both sides of the clamp shaft 32 are respectively a handle portion 311 and a connecting portion 312. The first clamping block 21 and the second clamping block 22 of the clamping mechanism 2 are respectively fixedly connected to the connecting portions 312 of the two clamp bodies 31. When in use, by holding the handle portions 311 of the two clamp bodies 31, the two clamp bodies 31 are operated to rotate, thereby driving the first clamping block 21 and the second clamping block 22 to close or separate. Further preferably, the handle portion 311 of the clamp body 31 is wrapped with a heat insulation protective cover (not shown in the drawings), and the heat insulation protective cover is made of high temperature resistant glass fiber. The operator holds the heat insulation protective cover in a handheld manner to avoid burns.

[0049] In this embodiment, if Figure 2 and Figure 3 As shown, as a preferred design, the distance from the end of the handle portion 311 of the pliers body 31 to the axis of the pliers shaft 32 is 115 mm, and the handle portion 311 has an arc segment. The thickness of the pliers body 31 is 8 mm. The size design of the pliers body 31 meets the lever principle and ergonomics. The torque is applied by the pliers body 31 and transmitted to the clamping block to clamp the bolt 1.

[0050] In this embodiment, as a preferred design, a closing limit block is respectively provided on the two pliers 31 of the operating mechanism 3, and the closing limit block can be specifically provided on the connecting portion 312. When the two pliers 31 are rotated until the two closing limit blocks abut against each other, the first clamping block 21 and the second clamping block 22 are in a clamping state, thereby ensuring that the first clamping block 21 and the second clamping block 22 will not over-tighten the bolt 1. In addition, a separation limit structure can also be provided on the two pliers 31 to limit the opening angle of the two pliers 31, thereby limiting the separation distance of the two first clamping blocks 21 and the second clamping blocks 22. In other embodiments, the operating mechanism 3 is not limited to a pliers mechanism, and other suitable structures can also be used.

[0051] In the utility model, the bolt 1 can be a hexagonal bolt 1 or other types of bolts 1, that is, the shape of the nut 11 can be a hexagonal, cylindrical, etc. The axial limiting groove 211 in the first clamping block 21 is a partial cylindrical hole with a central angle less than 180°, and is coaxially arranged with the first radial limiting groove 212 for easy processing. The inner diameter of the axial limiting groove 211 is greater than the maximum outer diameter of the nut 11, so that it can accommodate the nut. Similarly, the avoidance accommodating groove 221 in the second clamping block 22 is also a partial cylindrical hole with a central angle less than 180°, and is coaxially arranged with the second radial limiting groove 222 for easy processing. The inner diameter of the avoidance accommodating groove 221 is greater than the maximum outer diameter of the nut 11, so that it can accommodate the nut.

[0052] The bolt clamping device of the utility model has the following beneficial effects:

[0053] By setting the clamping mechanism 2, the operating mechanism 3 and the locking mechanism, the clamping mechanism 2 can stably clamp the bolt 1 in the warm rolling process, and the bolt 1 can rotate smoothly, solving the problem of part clamping and positioning during the rolling process of the bolt 1, so that the local high-temperature heat treatment and thread rolling processing of the bolt 1 can be continuously performed, meeting the use needs in the warm rolling process; the whole device has a simple structure, flexible and convenient operation, and improves processing efficiency.

[0054] In summary, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bolt clamping device for a bolt warm rolling process, the bolt (1) comprising a nut (11) and a screw portion, the screw portion being provided with a smooth shaft section (12) and a threaded section (13) in sequence from one end connected to the nut (11) to the other end, characterized in that: The bolt clamping device comprises a clamping mechanism (2), an operating mechanism (3) and a locking mechanism. The clamping mechanism (2) comprises a first clamping block (21) and a second clamping block (22) which are arranged opposite to each other. The first clamping block (21) is provided with an axial limiting groove (211) and a first radial limiting groove (212). The first radial limiting groove (212) is a partially cylindrical hole with a central angle less than 180°, and its radius is equal to the outer diameter of the optical axis rod segment (12). The two ends of the first radial limiting groove (212) are respectively connected to the axial limiting groove (211) and the outer surface of the first clamping block (21). The side surfaces at both ends of the axial limiting groove (211) are parallel and perpendicular to the axis of the first radial limiting groove (212), and the spacing between the side surfaces at both ends of the axial limiting groove (211) is equal to the thickness of the nut (11); the second clamping block (22) is provided with an avoidance accommodating groove (221) and a second radial limiting groove (222), the second radial limiting groove (222) is a partial cylindrical hole with a central angle less than 180°, and its inner diameter is equal to the outer diameter of the optical axis rod segment (12), and the two ends of the second radial limiting groove (222) are respectively connected to the avoidance accommodating groove (221) and the outer surface of the second clamping block (22). The width of the avoidance accommodating groove (221) in the axial direction of the second radial limiting groove (222) is greater than the thickness of the nut (11); the material of the first clamping block (21) and the second clamping block (22) is GH4169 with HRC35-40; the operating mechanism (3) is connected to the first clamping block (21) and the second clamping block (22), and can drive the first clamping block (21) and the second clamping block (22) to separate or close to a clamping state, and when the first clamping block (21) and the second clamping block (22) are in the clamping state, the first radial limiting groove (212) and the second radial limiting groove ( 222) are coaxial, and the axial limiting groove (211) and the avoidance accommodating groove (221) are aligned with each other; the locking mechanism is capable of locking and fixing the first clamping block (21) and the second clamping block (22) in a clamping state; when the clamping mechanism (2) is in a clamping state and clamps the bolt (1), the optical axis rod section (12) is located in the first radial limiting groove (212) and the second radial limiting groove (222), and extends out of the first radial limiting groove (212) and the second radial limiting groove (222), and the nut (11) is located in the axial limiting groove (211) and the avoidance accommodating groove (221).

2. The bolt clamping device for the bolt warm rolling process according to claim 1 is characterized in that: The locking mechanism comprises a locking screw (4); a first locking threaded hole is provided on the first clamping block (21); a second locking threaded hole is provided on the second clamping block (22); when the first clamping block (21) and the second clamping block (22) are in a clamping state, the first locking threaded hole and the second locking threaded hole are aligned with each other, and the locking screw (4) is screwed into the first locking threaded hole and the second locking threaded hole.

3. The bolt clamping device for the bolt warm rolling process according to claim 1 is characterized in that: The operating mechanism (3) comprises two pliers (31) and a pliers shaft (32); the two pliers (31) are rotatably connected via the pliers shaft (32); the parts of the pliers (31) located on both sides of the pliers shaft (32) are respectively a handle part (311) and a connecting part (312); and the first clamping block (21) and the second clamping block (22) of the clamping mechanism (2) are respectively fixedly connected to the connecting parts (312) of the two pliers (31).

4. The bolt clamping device for the bolt warm rolling process according to claim 3 is characterized in that: The handle portion (311) of the pliers body (31) is wrapped with a heat-insulating protective sleeve.

5. The bolt clamping device for the bolt warm rolling process according to claim 4 is characterized in that: The material of the heat-insulating protective sleeve is high-temperature resistant glass fiber.

6. The bolt clamping device for bolt warm rolling process according to claim 3 is characterized in that: The two clamp bodies (31) of the operating mechanism (3) are respectively provided with a closing limit block. When the two clamp bodies (31) rotate until the two closing limit blocks abut against each other, the first clamping block (21) and the second clamping block (22) are in a clamping state.

7. The bolt clamping device for bolt warm rolling process according to claim 1 is characterized in that: The axial limiting groove (211) in the first clamping block (21) is a partial cylindrical hole with a central angle less than 180°, and is coaxially arranged with the first radial limiting groove (212).

8. The bolt clamping device for bolt warm rolling process according to claim 1 is characterized in that: The avoidance accommodating groove (221) in the second clamping block (22) is a partially cylindrical hole with a central angle less than 180°, and is coaxially arranged with the second radial limiting groove (222).

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