Die for bolt cold heading forming

Abstract

The utility model discloses a die for bolt cold heading forming, which relates to the technical field of bolt cold heading forming and comprises a main machine body, a die splicing unit and a die stripping unit. According to the mold fence, the reliable mold splicing units are arranged, the combined plates can be pushed to be close to the middle through the threaded shafts, and the ends of the six combined plates are attached to one another, so that the mold fence of a regular hexagon structure is defined; the sleeving blocks are used for sleeving the combination plates and the rod bodies on the back, and can be conveniently taken down to replace the combination plates with different lengths, so that bolt heads with different models and sizes can be molded; a reliable mold stripping unit is further arranged, a first hydraulic cylinder pushes an arc-shaped clamping block to abut against the side face of a cylinder core in an attached mode, then the cylinder core is fixed, subsequent bolt stripping is facilitated, a second hydraulic cylinder can push a top cap to ascend and descend in the cylinder core, and therefore after the bolt is formed, the bolt can be upwards ejected out of a mold.

Description

Technical Field

[0001] This utility model relates to the field of cold heading technology for bolts, specifically a mold for cold heading bolts. Background Technology

[0002] Cold heading is a novel metal forming process with minimal cutting. It utilizes the plastic deformation of metal under external force, and with the aid of a die, redistributes and transfers the metal volume to form the desired part or blank. Cold heading is best suited for producing standard fasteners such as bolts, screws, nuts, rivets, and pins.

[0003] Existing molds used for cold heading of bolts are fixed structures, and each mold can only produce one type of bolt. If different types of bolts need to be produced, new molds need to be purchased, resulting in significant costs. Furthermore, existing molds often lack demolding and ejection mechanisms, making the molds impractical overall. Therefore, we propose a mold for cold heading of bolts. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome existing defects and provide a mold for cold heading bolts. This mold features a reliable mold assembly unit. By tightening the screw block, a threaded shaft can be rotated. As the threaded shaft screws in, it pushes the combination plates closer together, with the ends of the six combination plates fitting together to form a hexagonal mold enclosure. A connecting block is used for connecting the combination plates to the back rods and is easily removed to replace combination plates of different lengths, thus allowing for the shaping of bolt heads of different sizes. It also features a reliable ejection unit. A hydraulic cylinder pushes an arc-shaped clamping block against the side of the core, fixing the core and facilitating subsequent bolt removal. A second hydraulic cylinder pushes the top cap up and down inside the core, allowing the bolt to be ejected upwards from the mold after forming. Once the arc-shaped clamping block is released, the core can be unlocked, allowing for the replacement of cores with different inner diameters. This, combined with the dimensions of the upper mold enclosure, forms a matching bolt rod, effectively solving the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold for cold heading of bolts, comprising a main body, a mold assembly unit, and a demolding unit;

[0006] Main body: The cross-section is a regular hexagonal structure, and a hexagonal groove is opened on the inner side of its upper end;

[0007] Mold assembly unit: includes threaded shaft, screw block, combination plate, socket block, auxiliary ejector rod and limit block. Each end face of the outer side of the main body is threaded with a threaded shaft at the upper middle position. The threaded shaft is perpendicular to the mounting end face and a screw block is fixedly connected to the outer end. The groove is provided with six combination plates. The combination plate is a long strip isosceles trapezoidal structure with a base angle of 60 degrees on both sides. Three socket blocks are fixedly connected to the back of the combination plate. One end of the threaded shaft is rotatably connected to the inside of the socket block in the groove. Two auxiliary ejector rods are symmetrically distributed on both sides of the threaded shaft. One end of the auxiliary ejector rod pushes into the socket block on the edge side of the back of the combination plate. The outer end of the auxiliary ejector rod is fixedly connected to the limit block.

[0008] Demolding unit: Installed in the center of the main body.

[0009] By turning the screw block, the threaded shaft can be rotated. When the threaded shaft is screwed in, it can push the combination plates closer to the center. The ends of the six combination plates fit together to form a hexagonal mold enclosure. The sleeve block is used for the connection between the combination plates and the rods on the back, and it is easy to remove and replace combination plates of different lengths, so that bolt heads of different sizes can be shaped. The limit block is used to limit the sliding of the auxiliary push rod. By setting the auxiliary push rod, the combination plates can be supported to avoid the expansion pressure during the cold forming of the bolt head acting directly on the threaded shaft and causing thread damage.

[0010] Furthermore, the mold assembly unit also includes a pin hole row and a limiting pin. The auxiliary push rod is vertically slidably connected to the side of the main body. The upper end of the outer circumference of the auxiliary push rod has a pin hole row, which consists of a row of two connected circular pin holes. The upper end of the main body, at the vertical position corresponding to each auxiliary push rod, has two circular through holes. The limiting pin passes through the two circular through holes and is inserted into the pin hole row. The pin hole row, consisting of a row of two connected circular pin holes, reduces the distance between each pin hole and allows the protrusions on the hole edges to clamp the limiting pin. By inserting the limiting pin through the circular through holes on the upper side of the main body, the auxiliary push rod can be limited and fixed. Thus, after the combined plate forms the mold enclosure, the auxiliary push rod is fixed, ensuring that the auxiliary push rod effectively supports the combined plate.

[0011] Furthermore, the ejection unit includes a core slot and a core. A vertical core slot is provided at the center of the groove, and a core is vertically inserted into the core slot. The core slot is used for inserting the core, and the core is used to form the vertical section of the bolt.

[0012] Furthermore, the ejection unit also includes a second hydraulic cylinder, a top cap, and a connecting block. A cylindrical mounting chamber is located at the center of the bottom of the main body. The second hydraulic cylinder is embedded inside the mounting chamber. A ring of connecting blocks is fixedly connected to the side of the second hydraulic cylinder in a circular array. The other end of the connecting blocks is fixedly connected to the inner wall of the mounting chamber. The telescopic end of the second hydraulic cylinder faces vertically upward and extends into the interior of the cylinder core. A top cap is threaded onto the end of the telescopic end and slidably connected inside the cylinder core. The second hydraulic cylinder can push the top cap to rise and fall inside the cylinder core, thereby ejecting the bolt upward from the mold after bolt forming. The connecting block is used for the installation and fixation of the second hydraulic cylinder.

[0013] Furthermore, the demolding unit also includes a hydraulic cylinder and an arc-shaped clamping block. A hydraulic cylinder is embedded in the middle of the interior of each end face of the main body. The telescopic ends of each hydraulic cylinder are horizontally oriented towards the central axis of the cylinder core, and an arc-shaped clamping block is fixedly connected to the end of each telescopic end. The hydraulic cylinder pushes the arc-shaped clamping block to fit against the side of the cylinder core, thereby fixing the cylinder core and facilitating the subsequent removal of bolts. After the arc-shaped clamping block is released, the locking of the cylinder core can be released, allowing for the replacement of cylinder cores with different inner diameters, forming a matching bolt rod body with the dimensions of the upper mold enclosure.

[0014] Furthermore, the mold assembly unit also includes a distance monitor. A distance monitor is installed at the middle position of each section on the upper end of the main body. The transmitter of the distance monitor is perpendicular to the back of the assembly plate, and a display screen is installed on the upper side of the distance monitor. The distance monitor is used to monitor the movement distance of the assembly plate relative to the inner wall of the groove. The distance data can be viewed on the upper display screen, which helps production personnel ensure that the movement distance of each assembly plate is consistent, ensuring that the lengths of all sides of the produced bolt heads are equal.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This mold for cold heading of bolts has the following advantages:

[0016] 1. It features a reliable mold assembly unit. By tightening the screw block, the threaded shaft can be rotated. When the threaded shaft is screwed in, it can push the combination plates closer to the center. The ends of the six combination plates fit together to form a regular hexagonal mold enclosure. The sleeve block is used for the connection between the combination plates and the back rods, and it is easy to remove to replace combination plates of different lengths, thus allowing the molding of bolt heads of different sizes. By inserting a limit pin on the upper side, the auxiliary push rod can be limited and fixed. By setting the auxiliary push rod, the combination plates can be supported, avoiding thread damage caused by the expansion pressure during cold heading of the bolt head acting directly on the threaded shaft.

[0017] 2. It has a reliable demolding unit. The first hydraulic cylinder pushes the arc-shaped clamping block to fit against the side of the cylinder core, thereby fixing the cylinder core and facilitating the subsequent removal of the bolts. The second hydraulic cylinder can push the top cap to rise and fall inside the cylinder core, so that the bolt can be ejected upward from the mold after the bolt is formed. After the arc-shaped clamping block is released, the locking of the cylinder core can be released, so that cylinder cores of different inner diameters can be replaced, and the bolt rod body can be matched with the size of the upper mold baffle.

[0018] 3. This utility model has a reliable mold assembly unit. By turning the screwing block, the threaded shaft can be driven to rotate. When the threaded shaft is screwed in, it can push the combination plates closer to the center. The ends of the six combination plates fit together to form a regular hexagonal mold enclosure. The sleeve block is used for the sleeve between the combination plates and the rods on the back, and it is easy to remove to replace combination plates of different lengths, so that bolt heads of different sizes can be shaped. It also has a reliable demolding unit. The first hydraulic cylinder pushes the arc-shaped clamping block to fit against the side of the cylinder core, thereby fixing the cylinder core and facilitating the subsequent removal of the bolt. The second hydraulic cylinder can push the top cap to rise and fall inside the cylinder core, so that the bolt can be pushed upward from the mold after the bolt is formed. After the arc-shaped clamping block is released, the locking of the cylinder core can be released, so that cylinder cores of different inner diameters can be replaced to form matching bolt rods with the size of the upper mold enclosure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0021] Figure 3 This is a partial structural diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the outer periphery and lower side of this utility model.

[0023] In the diagram: 1 Main body, 2 Groove, 3 Mold assembly unit, 31 Threaded shaft, 32 Tightening block, 33 Combination plate, 34 Socket block, 35 Auxiliary ejector rod, 36 Limiting block, 37 Pin hole row, 38 Limiting pin, 39 Distance monitor, 4 Ejection unit, 41 Core slot, 42 Core, 43 Hydraulic cylinder one, 44 Arc-shaped clamping block, 45 Hydraulic cylinder two, 46 ​​Top cap, 47 Connecting block. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-4 This embodiment provides a technical solution: a mold for cold heading of bolts, comprising a main body 1, a mold assembly unit 3, and a demolding unit 4;

[0026] Main body 1: The cross-section is a regular hexagonal structure, and a hexagonal groove 2 is opened on the inner side of its upper end;

[0027] Mold assembly unit 3: includes threaded shaft 31, screw block 32, combination plate 33, sleeve block 34, auxiliary ejector rod 35 and limit block 36. Each end face of the outer side of the main body 1 is threaded with a threaded shaft 31 at the upper middle position. The threaded shaft 31 is perpendicular to the mounting end face and is fixedly connected to the screw block 32 at the outer end. The groove 2 is provided with six combination plates 33. The combination plate 33 is a long strip isosceles trapezoidal structure with a base angle of 60 degrees on both sides. Three sleeve blocks 34 are fixedly connected to the back of the combination plate 33. One end of the threaded shaft 31 located in the groove 2 is rotatably connected to the inside of the sleeve block 34. Two auxiliary ejector rods 35 are symmetrically distributed on both sides of the threaded shaft 31. One end of the auxiliary ejector rod 35 is pushed into the sleeve block 34 on the edge side of the back of the combination plate 33. The outer end of the auxiliary ejector rod 35 is fixedly connected to the limit block 36.

[0028] Demolding unit 4: installed in the center of the main body 1.

[0029] By turning the screw block 32, the threaded shaft 31 can be rotated. When the threaded shaft 31 is screwed in, it can push the combined plates 33 closer to the center. The ends of the six combined plates 33 fit together to form a mold enclosure with a regular hexagonal structure. The sleeve block 34 is used for the sleeve between the combined plates 33 and the rods on the back, and it is easy to remove and replace the combined plates 33 of different lengths, so that bolt heads of different sizes can be shaped. The limiting block 36 is used to limit the sliding of the auxiliary push rod 35. By setting the auxiliary push rod 35, the combined plates 33 can be supported to avoid the expansion pressure during the cold forming of the bolt head directly acting on the threaded shaft 31 and causing thread damage.

[0030] The mold assembly unit 3 also includes a pin hole row 37 and a limiting pin 38. The auxiliary push rod 35 is vertically and slidably connected to the side of the main body 1. The upper end of the outer circumference of the auxiliary push rod 35 is provided with a pin hole row 37, which consists of a row of circular pin holes connected in pairs. The upper end of the main body 1 and at the vertical position corresponding to each auxiliary push rod 35 are provided with two circular through holes. The limiting pin 38 passes through the two circular through holes and is inserted into the pin hole row 37. The pin hole row 37, consisting of a row of circular pin holes connected in pairs, can reduce the distance between each pin hole and can use the protrusions on the edge of the holes to clamp the limiting pin 38. By inserting the limiting pin 38 into the circular through hole on the upper side of the main body 1, the auxiliary push rod 35 can be limited and fixed. Thus, after the combined plate 33 forms the mold enclosure, the auxiliary push rod 35 is fixed, so that the auxiliary push rod 35 can effectively support the combined plate 33.

[0031] The ejection unit 4 includes a core slot 41 and a core 42. A vertical core slot 41 is provided at the center of the groove 2, and a core 42 is vertically inserted into the core slot 41. The core slot 41 is used for inserting the core 42, and the core 42 is used to form the vertical section of the bolt.

[0032] The demolding unit 4 also includes a second hydraulic cylinder 45, a top cap 46, and a connecting block 47. A cylindrical mounting chamber is provided at the center of the bottom of the main body 1. The second hydraulic cylinder 45 is embedded inside the mounting chamber. A ring of connecting blocks 47 is fixedly connected to the side of the second hydraulic cylinder 45 in a circular array. The other end of the connecting block 47 is fixedly connected to the inner wall of the mounting chamber. The telescopic end of the second hydraulic cylinder 45 is vertically upward and extends into the inside of the core 42. The top cap 46 is threaded onto the end of the telescopic end and is slidably connected inside the core 42. The second hydraulic cylinder 45 can push the top cap 46 to rise and fall inside the core 42, so that the bolt can be ejected upward from the mold after the bolt is formed. The connecting block 47 is used for the installation and fixation of the second hydraulic cylinder 45.

[0033] The demolding unit 4 also includes a hydraulic cylinder 43 and an arc-shaped clamping block 44. A hydraulic cylinder 43 is embedded in the middle of the inner side of each end face of the main body 1. The telescopic ends of each hydraulic cylinder 43 are horizontally oriented towards the central axis of the cylindrical core 42, and an arc-shaped clamping block 44 is fixedly connected to the end of each telescopic end. The hydraulic cylinder 43 pushes the arc-shaped clamping block 44 to fit against the side of the cylindrical core 42, thereby fixing the cylindrical core 42 and facilitating the subsequent removal of bolts. After the arc-shaped clamping block 44 is released, the locking of the cylindrical core 42 can be released, so that cylindrical cores 42 with different inner diameters can be replaced, and a matching bolt rod can be formed with the size of the upper mold enclosure.

[0034] The mold assembly unit 3 also includes a distance monitor 39. One distance monitor 39 is installed at the middle position of each section on the upper end of the main body 1. The transmitting end of the distance monitor 39 is perpendicular to the back of the assembly plate 33, and a display screen is installed on the upper side of the distance monitor 39. The distance monitor 39 is used to monitor the movement distance of the assembly plate 33 relative to the inner wall of the groove 2. The distance data can be viewed on the upper display screen, which helps production personnel ensure that the movement distance of each assembly plate 33 is consistent, ensuring that the lengths of all sides of the produced bolt heads are equal.

[0035] The working principle of the bolt cold heading mold provided by this utility model is as follows: The mold is equipped with a reliable mold assembly unit 3. By turning the screw block 32, the threaded shaft 31 can be driven to rotate. When the threaded shaft 31 is screwed in, it can push the combination plate 33 to move closer to the center. The ends of the six combination plates 33 fit together to form a mold enclosure with a regular hexagonal structure. The sleeve block 34 is used for the sleeve between the combination plate 33 and each rod on the back, and it is easy to remove and replace the combination plate 33 of different lengths, so that bolt heads of different sizes can be shaped. By inserting the limiting pin 38 on the upper side, the auxiliary push rod 35 can be limited and fixed. By setting the auxiliary push rod 35, the combination plate 33 can be supported, avoiding the expansion pressure during the cold heading of the bolt head from directly acting on the threaded shaft 31 and causing thread damage. This mold also features a reliable ejection unit 4. A core slot 41 is used for inserting a core 42, which forms the vertical section of the bolt. A hydraulic cylinder 43 pushes an arc-shaped clamping block 44 to abut against the side of the core 42, thus fixing the core 42 and facilitating subsequent bolt removal. A hydraulic cylinder 45 pushes a top cap 46 up and down inside the core 42, allowing the bolt to be ejected upwards from the mold after forming. Once the arc-shaped clamping block 44 is released, the core 42 can be unlocked, allowing for the replacement of cores 42 with different inner diameters to form matching bolt shanks. Furthermore, a distance monitor 39 monitors the movement distance of the combination plate 33 relative to the inner wall of the groove 2. Distance data can be viewed on the upper display screen, enabling production personnel to ensure that the movement distance of each combination plate 33 is consistent, ensuring that the lengths of all sides of the produced bolt head are equal.

[0036] It is worth noting that the input terminals of hydraulic cylinder 43, hydraulic cylinder 45 and distance monitor 39 disclosed in the above embodiments are all electrically connected to the output terminal of an external power supply through an external control switch group. The control switch group controls the operation of hydraulic cylinder 43, hydraulic cylinder 45 and distance monitor 39 using methods commonly used in the prior art.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A mold for cold heading of bolts, characterized in that: It includes the main body (1), the mold assembly unit (3) and the demolding unit (4); Main body (1): The cross-section is a regular hexagonal structure, and a groove (2) of the same hexagonal shape is opened on the inner side of its upper end; Mold assembly unit (3): includes a threaded shaft (31), a screw block (32), a combination plate (33), a sleeve block (34), an auxiliary push rod (35), and a limiting block (36). A threaded shaft (31) is threadedly connected to the upper middle part of each end face of the outer side of the main body (1). The threaded shaft (31) is perpendicular to the mounting end face and a screw block (32) is fixedly connected to its outer end. The groove (2) is provided with six combination plates (33). The combination plate (33) is a long strip of isosceles trapezoid. The structure has a bottom angle of 60 degrees on both sides. Three socket blocks (34) are fixedly connected to the back of the combined plate (33). One end of the threaded shaft (31) located in the groove (2) is rotatably connected to the inside of the socket block (34). Two auxiliary push rods (35) are symmetrically distributed on both sides of the threaded shaft (31). One end of the auxiliary push rod (35) is pushed into the socket block (34) on the edge side of the back of the combined plate (33). The outer end of the auxiliary push rod (35) is fixedly connected to a limit block (36). Demolding unit (4): installed in the center of the main body (1).

2. The bolt cold heading die according to claim 1, characterized in that: The mold assembly unit (3) also includes a pin hole row (37) and a limiting pin (38). The auxiliary push rod (35) is vertically slidably connected to the side of the main body (1). The upper end of the outer circumference of the auxiliary push rod (35) is provided with a pin hole row (37). The pin hole row (37) is composed of a row of circular pin holes connected in pairs. The upper end of the main body (1) and at the vertical position corresponding to each auxiliary push rod (35) are provided with two circular through holes. The limiting pin (38) passes through the two circular through holes and is inserted into the pin hole row (37).

3. The bolt cold heading die according to claim 1, characterized in that: The ejection unit (4) includes a core slot (41) and a core (42). A vertical core slot (41) is provided at the center of the groove (2), and a core (42) is vertically inserted inside the core slot (41).

4. The bolt cold heading die according to claim 3, characterized in that: The demolding unit (4) also includes a second hydraulic cylinder (45), a top cap (46), and a connecting block (47). A cylindrical mounting chamber is provided at the bottom center of the main body (1). The second hydraulic cylinder (45) is embedded in the mounting chamber. A ring of connecting blocks (47) is fixedly connected to the side of the second hydraulic cylinder (45) in a circular array. The other end of the connecting block (47) is fixedly connected to the inner wall of the mounting chamber. The telescopic end of the second hydraulic cylinder (45) is vertically upward and extends into the inside of the core (42). The end of the telescopic end is threaded with a top cap (46), which is slidably connected to the inside of the core (42).

5. The bolt cold heading die according to claim 4, characterized in that: The demolding unit (4) also includes a hydraulic cylinder (43) and an arc-shaped clamping block (44). A hydraulic cylinder (43) is embedded in the middle side of the inner side of each end face of the main body (1). The telescopic ends of each hydraulic cylinder (43) are horizontally oriented toward the central axis of the cylinder core (42), and an arc-shaped clamping block (44) is fixedly connected to the end of each telescopic end.

6. The bolt cold heading die according to claim 2, characterized in that: The mold assembly unit (3) also includes a distance monitor (39). A distance monitor (39) is installed at the middle position of each section of the upper part of the main body (1). The horizontal distance between each distance monitor (39) and the inner wall of the groove (2) is equal, and the transmitting end is perpendicular to the back of the combination plate (33).

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