Nut and bolt forming die assembly

Abstract

The utility model discloses a nut and bolt forming die assembly which comprises a forming die assembly body, the forming die assembly body comprises a first forming die and a second forming die which are fixedly connected, a punch adaptive groove is formed in the top end of the forming die assembly body, and a cold heading punch is arranged in the punch adaptive groove; and a fixed mounting frame is fixedly mounted at the bottom end of an inner cavity of the mounting outer mold shell, an inner threaded sleeve is fixedly connected to the inner wall of the top end of the fixed mounting frame, a positioning mounting cylinder is fixedly mounted in the inner threaded sleeve, and a demolding telescopic rod is fixedly mounted in the positioning mounting cylinder. According to the nut and bolt forming die assembly, the replaceable sliding rod is matched with the sleeve, so that the whole bolt cold heading die can machine bolts of various lengths, the actual use effect of the cold heading die is improved, the number of the cold heading die is reduced, the operation of repeatedly installing the die in the cold heading process is reduced, and the actual use significance of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to the field of nut and bolt processing technology, and in particular to nut and bolt forming mold assembly. Background Technology

[0002] In existing technologies, cold heading is a method of forming bolts and nuts by plastic deformation of materials at room temperature, and it is also the existing method for mass production of nuts and bolts.

[0003] A search revealed Chinese patent application number 202420571341.3, which discloses a mold for cold heading of eccentric bolts. The mold includes a bottom mold, a fixed frame fixedly mounted at the rear end of the top of the bottom mold, a pneumatic cylinder fixedly mounted at the top of the fixed frame, the other end of the pneumatic cylinder penetrating the fixed frame and extending to the top of the inner cavity of the fixed frame, fixed plates fixedly mounted on the left and right sides of the bottom of the outer surface of the pneumatic cylinder, a mounting plate movably connected to the outer surface of the fixed plate, a pull block movably connected to the front of the mounting plate, a movable plate fixedly mounted on the back of the pull block, the other end of the movable plate penetrating the mounting plate and extending to the back of the mounting plate, the outer surface of the movable plate movably connected to the interior of the fixed plate, and the bottom of the mounting plate fixedly connected to the top of the stamping block.

[0004] The aforementioned patent has the following shortcomings: Bolt cold heading usually employs a multi-station cold heading processing device. Inside this device, multiple punches correspond to multiple identical dies, achieving continuity in bolt cold heading. In conventional cold heading dies, a single die can generally only process bolts of one size. However, many bolts have different lengths but the same other dimensions. For example, an M10×100 bolt and an M10×60 bolt both have a nominal diameter of 10mm, but their lengths differ. Under the same processing precision, their cold heading dies are different, resulting in a large variety of dies required for bolt cold heading. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a nut and bolt forming mold assembly.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Nut and bolt forming die assembly, including:

[0008] A forming mold assembly includes a first forming mold and a second forming mold that are fixedly connected. The top of the forming mold assembly is provided with a punch adapter groove, and a cold heading punch is provided inside the punch adapter groove.

[0009] An outer mold shell is installed, and a fixed mounting frame is fixedly installed at the bottom of its inner cavity. An internal threaded sleeve is fixedly connected to the inner wall of the top of the fixed mounting frame. A positioning mounting cylinder is fixedly installed inside the internal threaded sleeve, and a demolding telescopic rod is fixedly installed inside the positioning mounting cylinder.

[0010] The bottom wall of the punch adapter groove is provided with a bolt head forming groove, and the bottom wall of the bolt head forming groove is provided with a bolt shank forming groove. A sliding rod fitting sleeve is fixedly installed at the bottom of the inner cavity of the bolt shank forming groove, and a demolding sliding rod is slidably installed inside the sliding rod fitting sleeve.

[0011] As a further improvement of this utility model: a double-ended screw is threadedly installed at the bottom end of the demolding slide bar, and the double-ended screw is threadedly installed at the top end of the demolding telescopic rod.

[0012] As a further embodiment of this utility model: a telescopic rod fixing tail cylinder is fixedly installed at the bottom end of the demolding telescopic rod, and multiple fixing connecting arms are fixedly connected at equal intervals to the outer wall of the telescopic rod fixing tail cylinder, and the fixing connecting arms are fixedly connected to the top inner wall of the fixed installation frame.

[0013] As a further embodiment of this utility model: a limiting protrusion is fixedly connected to the top of the outer wall of the first molding die, and a limiting protrusion is fixedly connected to the top outer wall of the second molding die.

[0014] As a further improvement of this utility model, both the first limiting protrusion and the second limiting protrusion are fixedly installed on the top of the outer mold shell by multiple bolts.

[0015] As a further embodiment of this utility model: two positioning blocks are symmetrically arranged on one side of the first molding mold, and two corresponding positioning block slots are opened on one side of the second molding mold.

[0016] As a further improvement of this utility model: the top of the cold heading punch is integrally formed with a fixed mounting sleeve, and the bottom of the cold heading punch is provided with a bolt head forming groove.

[0017] As a further embodiment of this utility model: the longitudinal section of the inner cavity of the sliding rod and the sleeve is set to a T-shape, and the demolding sliding rod and the sliding rod and the sleeve are set to a clearance fit.

[0018] Compared with the prior art, the present invention provides a nut and bolt forming mold assembly, which has the following beneficial effects:

[0019] This nut and bolt forming mold assembly, through the interchangeable sliding rod and sleeve, enables the overall bolt cold heading mold to process bolts of various lengths, improving the actual use effect of the cold heading mold, reducing the number of cold heading molds, reducing the operation of repeatedly installing molds during the cold heading process, and enhancing the practical significance of the overall device.

[0020] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the overall assembly of this utility model.

[0022] Figure 2 This is a partial cross-sectional view of the overall assembly of this utility model. Figure 1 .

[0023] Figure 3 This utility model Figure 2 A magnified structural diagram of point A in the middle.

[0024] Figure 4 This is a partial cross-sectional view of the overall assembly of this utility model. Figure 2 .

[0025] In the diagram: 1. Outer mold shell; 2. Forming mold one; 3. Forming mold two; 4. Limiting protrusion one; 5. Limiting protrusion two; 6. Punch adapter groove; 7. Bolt head forming groove one; 8. Cold heading punch; 9. Fixed mounting sleeve; 10. Bolt shank forming groove; 11. Fixed mounting frame; 12. Internal threaded sleeve; 13. Positioning mounting sleeve; 14. Demolding telescopic rod; 15. Telescopic rod fixed tail cylinder; 16. Fixed connecting arm; 17. Double-ended screw; 18. Demolding slide bar; 19. Slide bar mating sleeve; 20. Positioning block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Nut and bolt forming mold assembly, such as Figures 1 to 4 As shown, it includes: a forming mold assembly and an outer mold housing 1. The forming mold assembly is fixedly installed inside the outer mold housing 1, and the outer mold housing 1 is fixedly installed inside the cold heading machine.

[0028] The molding die assembly includes a first molding die 2 and a second molding die 3 that are fixedly connected. A punch adapter groove 6 is provided at the top of the molding die assembly (the top of the mating surfaces of the first molding die 2 and the second molding die 3).

[0029] The punch adapter groove 6 is equipped with a cold heading punch 8. The top of the cold heading punch 8 is integrally formed with a fixed mounting sleeve 9. The fixed mounting sleeve 9 is connected to the punching head of the cold heading machine. The bottom of the cold heading punch 8 is provided with a bolt head forming groove 2 to cold heading the top of the raw material rod into a hexagonal prism shape.

[0030] The top of the outer wall of the molding mold 1 2 is fixedly connected to a limiting protrusion 4, and the top outer wall of the molding mold 2 3 is fixedly connected to a limiting protrusion 5. The limiting protrusion 4 and the limiting protrusion 5 are symmetrically arranged. The top of the outer mold shell 1 is provided with a protrusion mounting groove, and the limiting protrusion 4 and the limiting protrusion 5 are both fixedly installed inside the protrusion mounting groove by multiple bolts.

[0031] On the lower middle part of the side of the molding mold 1 2 near the molding mold 2 3, there are two symmetrically arranged positioning blocks 20 integrally formed. On the side of the molding mold 2 3 near the molding mold 1 2, there are two corresponding block slots. On the other side of the molding mold 2 3, there are two sets of threaded holes. The threaded holes are connected to the block slots and extend into the interior of the positioning blocks 20. Bolts are installed inside the threaded holes to fix the molding mold 1 2 and the molding mold 2 3.

[0032] The bottom wall of the punch adapter groove 6 is provided with a bolt head forming groove 7. The bolt head forming groove 7 and the bolt head forming groove 2 cooperate to cold forge the top of the raw material rod into a hexagonal prism shape.

[0033] The bottom wall of the bolt head forming groove 17 is provided with a bolt shank forming groove 10. The bolt shank forming groove 10 passes through the forming mold 12 and the forming mold 23. A sliding rod fitting sleeve 19 is fixedly installed at the bottom of the inner cavity of the bolt shank forming groove 10. The bottom end of the sliding rod fitting sleeve 19 is integrally formed with a limiting plate, which fits against the lower surface of the forming mold 12 and the forming mold 23.

[0034] A demolding slide rod 18 is slidably installed inside the slide rod sleeve 19. The demolding slide rod 18 and the slide rod sleeve 19 are configured for clearance fit. A double-ended screw 17 is threaded onto the bottom end of the demolding slide rod 18.

[0035] The longitudinal section of the inner cavity of the sliding rod and sleeve 19 is T-shaped, that is, the top of the inner cavity is a disc-shaped groove, and the other parts are cylindrical grooves. The diameter of the disc-shaped groove is larger than the diameter of the cylindrical groove. The cylindrical groove passes through the sliding rod and sleeve 19, and the inner wall of the top of the disc-shaped groove is chamfered.

[0036] The top of the demolding slide bar 18 is set as a disc shape that matches the disc groove. Its top surface is in the same plane as the lower edge of the chamfer, which makes it easy to directly process the chamfer during the cold heading process of the raw material bar.

[0037] A fixed mounting frame 11 is provided at the bottom of the inner cavity of the outer mold shell 1. The bottom of the fixed mounting frame 11 is set as a through opening, and multiple bolts are installed on the four inner walls of the frame. The bolts are screwed into the shell of the outer mold shell 1.

[0038] An internally threaded sleeve 12 is fixedly connected to the inner wall of the top of the fixed mounting frame 11. The inner cavity of the internally threaded sleeve 12 penetrates the top frame of the fixed mounting frame 11 and is coaxial with the forming groove 10 of the bolt rod.

[0039] The internal threaded sleeve 12 has a positioning mounting cylinder 13 fixedly installed inside. The top end of the positioning mounting cylinder 13 has a slot for engaging the limiting plate. The positioning mounting cylinder 13 also has a demolding telescopic rod 14 fixedly installed inside. The top end of the demolding telescopic rod 14 is threadedly connected to the double-ended screw 17 and fits against the bottom end of the demolding slide rod 18.

[0040] The bottom end of the demolding telescopic rod 14 is fixedly installed with a telescopic rod fixing tail cylinder 15. Multiple fixing connecting arms 16 are welded at equal intervals on the outer wall of the telescopic rod fixing tail cylinder 15. The fixing connecting arms 16 are fixedly connected to the top inner wall of the fixed installation frame 11.

[0041] Working principle:

[0042] Please refer to Figures 1 to 4 Assemble the device as shown in the figure.

[0043] When in use, this device is installed inside the cold heading machine. The structure shown is the structure of the last station in the cold heading of bolts. The structures of other preceding stations differ from those disclosed in this application in that the bolt head forming groove 7 and the cold heading punch 8 can be adapted according to the actual production conditions. The demolding telescopic rod 14 disclosed above can be set as an electric telescopic rod, a pneumatic cylinder, or other device capable of rapid telescopic movement. The sliding rod and sleeve 19 can be selected according to the bolt shank length required for cold heading, so that the length of the raw material shank inside the bolt shank forming groove 10 meets the bolt production requirements.

[0044] The raw material rod is inserted into the bolt rod forming groove 10. The cold heading punch 8 cold heads the end of the raw material rod. The end of the raw material rod is formed into a hexagonal prism shape inside the bolt head forming groove 1 7 and the bolt head forming groove 2. The tail of the raw material rod is chamfered under the action of the demolding slide bar 18 and the slide bar sleeve 19. After the cold heading is completed, the demolding telescopic rod 14 extends and pushes out the formed bolt through the demolding slide bar 18, and then retracts to the initial state (e.g., Figure 2 (The state shown).

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A nut and bolt forming mold assembly, characterized in that, include: The forming mold assembly includes a forming mold one (2) and a forming mold two (3) fixedly connected. The top of the forming mold assembly is provided with a punch adapter groove (6), and a cold heading punch (8) is provided inside the punch adapter groove (6). The outer mold shell (1) is installed, and a fixed mounting frame (11) is fixedly installed at the bottom of its inner cavity. An internal threaded sleeve (12) is fixedly connected to the inner wall of the top of the fixed mounting frame (11). A positioning mounting cylinder (13) is fixedly installed inside the internal threaded sleeve (12), and a demolding telescopic rod (14) is fixedly installed inside the positioning mounting cylinder (13).

2. The nut and bolt forming mold assembly according to claim 1, characterized in that: The bottom wall of the punch adapter groove (6) is provided with a bolt head forming groove (7), and the bottom wall of the bolt head forming groove (7) is provided with a bolt shank forming groove (10). A sliding rod fitting sleeve (19) is fixedly installed at the bottom of the inner cavity of the bolt shank forming groove (10), and a demolding sliding rod (18) is slidably installed inside the sliding rod fitting sleeve (19).

3. The nut and bolt forming die assembly according to claim 2, characterized in that: The bottom end of the demolding slide bar (18) is threaded with a double-ended screw (17), which is threaded onto the top end of the demolding telescopic rod (14).

4. The nut and bolt forming die assembly according to any one of claims 1-3, characterized in that: The bottom end of the demolding telescopic rod (14) is fixedly installed with a telescopic rod fixing tail cylinder (15). Multiple fixing connecting arms (16) are fixedly connected at equal intervals on the outer wall of the telescopic rod fixing tail cylinder (15). The fixing connecting arms (16) are fixedly connected to the top inner wall of the fixed installation frame (11).

5. The nut and bolt forming die assembly according to claim 1, characterized in that: The top of the outer wall of the first molding die (2) is fixedly connected to a limiting protrusion (4), and the top outer wall of the second molding die (3) is fixedly connected to a limiting protrusion (5).

6. The nut and bolt forming die assembly according to claim 5, characterized in that: The limiting protrusion one (4) and the limiting protrusion two (5) are both fixedly installed on the top of the outer mold shell (1) by multiple bolts.

7. The nut and bolt forming die assembly according to claim 1 or 5, characterized in that: Two positioning blocks (20) are symmetrically arranged on one side of the first molding mold (2), and two corresponding slots are opened on one side of the second molding mold (3).

8. The nut and bolt forming die assembly according to claim 1, characterized in that: The top of the cold heading punch (8) is integrally formed with a fixed mounting sleeve (9), and the bottom of the cold heading punch (8) is provided with a bolt head forming groove.

9. The nut and bolt forming die assembly according to claim 2 or 3, characterized in that: The longitudinal section of the inner cavity of the slide bar sleeve (19) is T-shaped, and the demolding slide bar (18) and the slide bar sleeve (19) are configured for clearance fit.

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