Hexagonal flange face bolt processing device and forming processing method thereof

Abstract

The application belongs to the technical field of machinery and provides a processing device and a forming processing method for an angular flange face bolt. The processing device further comprises: a first station cold heading die, including a first station upper die and a first station lower die; the first station upper die has a sequence punch cavity for extruding one end of a preformed cutting material into a preformed head of the angular flange face bolt; the first station lower die has a sequence lower die cavity for extruding the other end of the cutting material into a thread blank diameter of the angular flange face bolt; a second station cold heading die, including a second station upper die and a second station lower die; the second station upper die has a sequence punch cavity for extruding and expanding the preformed head of the angular flange face bolt into a hexagonal flange face head of the angular flange face bolt; and the second station lower die has a sequence lower die cavity for extruding the thread blank diameter into a hexagonal flange face head of the angular flange face bolt. Thus, the application realizes lean production of the cold forming process of the angular flange face bolt.

Description

Technical Field

[0001] This invention relates to the field of mechanical technology, and in particular to a processing device and a forming method for hexagonal flange bolts. Background Technology

[0002] Currently, the cold forming process for hexagonal flange bolts adopts a four-step cold heading process, such as... Figures 1A to 1G The process involves several steps: First, material 1 is extruded and deformed into a thread blank diameter 2. Second, the bolt head is upset and pre-formed into pre-formed material 3. Third, the pre-formed hexagon is upset, resulting in pre-formed material 4. Fourth, the hexagonal head flange face and the tail end of the bolt shank are upset and chamfered, resulting in pre-formed material 5. During the second and third steps of cold upsetting the head, the material experiences severe work hardening. The material's strength increases with the amount of deformation, but its fluidity decreases, negatively impacting the lifespan of the stamping die in the fourth step. Furthermore, the hexagonal bolt head is a flat structure without recessed weight-reducing features, resulting in a higher material consumption. In mass production, the existing cold forming process causes significant wear and tear on both the die and the material.

[0003] In summary, the existing technology for machining hexagonal flange bolts has obvious inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0004] To address the aforementioned deficiencies, the present invention aims to provide a processing device and forming method for hexagonal flange bolts, thereby achieving lean production of the cold forming process for hexagonal flange bolts.

[0005] To achieve the above-mentioned objective, the present invention provides a processing apparatus for hexagonal flange bolts, including a cold heading machine, and the processing apparatus further includes:

[0006] The first station cold heading die is installed on the cold heading machine to perform the first station cold heading process. The first station cold heading die includes a first station upper die and a first station lower die. The first station upper die has a punch cavity that extrudes one end of the pre-cut material into the pre-formed head of the hexagonal flange bolt. The first station lower die has a lower die cavity that extrudes the other end of the cut material into the thread blank diameter of the hexagonal flange bolt. After completing the first station cold heading process, the pre-formed die material of the hexagonal flange bolt is produced.

[0007] The second-station cold heading die is installed on the cold heading machine to perform the second-station cold heading process. The second-station cold heading die includes a second-station upper die and a second-station lower die. The second-station upper die has a two-stage punch cavity for extruding and expanding the pre-formed head of the hexagonal flange bolt into the hexagonal flange head of the hexagonal flange bolt. The second-station lower die has a two-stage lower die cavity for extruding the thread blank diameter into the chamfered tail end of the shank of the hexagonal flange bolt. After completing the second-station cold heading process, the hexagonal flange bolt is manufactured.

[0008] According to the processing apparatus, the upper mold at the first station includes:

[0009] The first spring seat is fixed on the cold heading machine;

[0010] The first spring is sleeved on the first spring seat;

[0011] A first-order punch is disposed at the front end of the first spring seat. One end of the first-order punch has a first upper die ejector cavity, and the other end has the first-order punch cavity.

[0012] The first upper mold ejector pin is located at the front end of the first spring seat and is inserted into the cavity of the first upper mold ejector pin.

[0013] A first-order punch sleeve is fixed on the cold heading machine and sleeved on the outside of the first spring seat and the first-order punch; the first-order punch slides relative to the first-order punch sleeve.

[0014] The lower mold of the first station includes:

[0015] The first lower die ejector pin seat is located at the rear end of the lower die at the first station and is fixed on the cold heading machine;

[0016] The first lower mold pad is disposed at the front end of the first lower mold ejector seat, and a first channel cavity is formed on the first lower mold pad;

[0017] A first-order lower mold is set at the front end of the first station lower mold, with the first-order lower mold cavity at its front end and a second channel cavity at its rear end;

[0018] The first lower mold ejector rod extends from the first lower mold ejector rod seat and passes through the first channel cavity and the second channel cavity in sequence. After the cold heading process at the first station is completed, the preformed mold material is ejected.

[0019] According to the processing device, the upper mold at the second station includes:

[0020] The second punch is fixed on the cold heading machine; a pad mold cavity is provided at its rear end, and the second punch cavity is provided at its front end;

[0021] The second spring is sleeved on the rear end of the second punch.

[0022] The second upper mold pad is disposed inside the pad mold cavity and slides relative to the pad mold cavity;

[0023] A hexagonal push rod is disposed within the cavity of the pad block and located at the front end of the second upper mold pad block;

[0024] The second station lower mold includes:

[0025] The second lower die ejector pin seat is located at the rear end of the lower die in the second station and is fixed on the cold heading machine;

[0026] The second lower mold pad is located at the front end of the second lower mold ejector pin seat, and a third channel cavity is formed on the second lower mold pad;

[0027] The second-order lower mold is located at the front end of the second station lower mold, with the second-order lower mold cavity at its front end and the fourth channel cavity at its rear end.

[0028] The second lower mold ejector rod extends from the second lower mold ejector rod seat and passes through the third channel cavity and the fourth channel cavity in sequence. After the cold heading process at the second station is completed, the preformed mold material is ejected.

[0029] According to the processing device, the pre-formed head of the hexagonal flange bolt is an inverted conical structure; wherein the top arc of the inverted conical structure is formed in the cavity of the first punch, and the lower conical part of the inverted conical structure is formed in the cavity of the first lower mold.

[0030] According to the processing device, the front end of the hexagonal push rod has a recessed cavity, which forms a weight-reducing recess for the head of the hexagonal flange bolt.

[0031] To achieve another objective of this invention, the present invention also provides a method for processing hexagonal flange bolts using the processing apparatus described in any of the above claims, comprising:

[0032] The pre-cut material is transported to the first station upper die and the first station lower die of the first station cold heading mold; the first station upper die moves towards the first station lower die, and the pre-cut material is squeezed into the first punch cavity of the first station upper die and the first lower mold cavity of the first station lower die; after the first station upper die and the first station lower die are fitted together and then the mold is opened, the pre-formed mold material of the hexagonal flange bolt is produced;

[0033] The preformed die material is transported to the space between the upper die and the lower die of the second station cold heading die; the upper die moves towards the lower die, and the preformed die material is squeezed into the second punch cavity of the upper die and the second lower die cavity of the lower die; after the upper die and the lower die are fitted together and then opened, the hexagonal flange bolt is formed.

[0034] According to the method, the upper die of the first station moves towards the lower die of the first station, and the pre-cut material is extruded into the first punch cavity of the upper die of the first station and the first lower die cavity of the lower die of the first station; after the upper die of the first station and the lower die of the first station are fitted together and then the mold is opened, the pre-formed die material for the hexagonal flange bolt includes:

[0035] The upper mold at the first station moves toward the lower mold at the first station;

[0036] When the upper die of the first station is in contact with the lower die of the first station, the pre-made cutting material is squeezed into the first punch cavity of the first punch and the first lower die cavity of the first die, respectively extruding and forming the pre-formed head of the hexagonal flange bolt and the thread blank diameter of the hexagonal flange bolt.

[0037] When the upper mold and the lower mold of the first station open, the upper mold of the first station moves away from the lower mold of the first station; the ejector rod of the lower mold ejects the preformed mold material of the hexagonal flange bolt.

[0038] According to the method, the upper die of the second station moves towards the lower die of the second station, and the preformed die material is extruded into the second-order punch cavity of the upper die of the second station and the second-order lower die cavity of the lower die of the second station; after the upper die of the second station and the lower die of the second station are fitted together and then the die is opened, the hexagonal flange bolt is formed by:

[0039] The upper mold at the second station moves towards the lower mold at the second station;

[0040] When the upper die of the second station is in contact with the lower die of the second station, the preformed die material of the hexagonal flange bolt is squeezed into the cavity of the second punch of the second punch and the cavity of the second lower die of the second die, respectively extruding and forming the hexagonal flange head of the hexagonal flange bolt and the chamfer of the tail end of the shank of the hexagonal flange bolt;

[0041] When the upper mold and the lower mold of the second station open, the upper mold of the second station moves away from the lower mold of the second station; the ejector rod of the second lower mold pushes out the hexagonal flange bolt.

[0042] According to the method, the pre-formed head of the hexagonal flange bolt is an inverted conical structure; wherein the top arc of the inverted conical structure is formed in the cavity of the first-order punch, and the lower conical part of the inverted conical structure is formed in the cavity of the first-order lower mold.

[0043] The front end of the hexagonal push rod has a recessed cavity, which forms a weight-reducing recess for the head of the hexagonal flange bolt.

[0044] To achieve another objective of this invention, the present invention also provides a hexagonal flange bolt processed using the processing device described in any of the above claims.

[0045] This invention configures a processing device for hexagonal flange bolts, comprising a first-station cold heading die, which includes a first-station upper die and a first-station lower die; and a second-station cold heading die, which includes a second-station upper die and a second-station lower die. The first-station cold heading die performs a first process of pre-forming the hexagonal flange bolt head, extruding and deforming the hexagonal flange bolt shank to form the thread blank diameter. The pre-formed head of the hexagonal flange bolt adopts an inverted conical structure, with the top arc of the pre-formed portion formed in the upper die cavity and the lower inverted conical portion formed in the lower die cavity. This pre-formed structure facilitates material flow during the upsetting process and aids in the subsequent pressure deformation process. The second-station cold heading die performs a second process of upsetting the hexagonal flange head and chamfering the tail end of the bolt shank. This second process, through the extrusion of the upper and lower dies, extrudes and upsets the pre-formed structure from the first process to meet the dimensional requirements of the hexagonal flange bolt. Furthermore, the head of the hexagonal flange bolt has a weight-reducing recess. Thus, this invention enables lean production of the cold forming process for hexagonal flange bolts. Attached Figure Description

[0046] Figure 1A This is a schematic diagram of the cutting structure for processing hexagonal flange bolts using existing technology;

[0047] Figure 1B This is a structural schematic diagram of a hexagonal flange bolt processed in the first step of existing technology;

[0048] Figure 1C This is a schematic diagram of the structure of a hexagonal flange bolt processed in the second step of the existing technology;

[0049] Figure 1D This is a structural schematic diagram of a hexagonal flange bolt processed in the third step of the existing technology;

[0050] Figure 1E This is a top view of a hexagonal flange bolt processed in the third step of the existing technology;

[0051] Figure 1FThis is a structural schematic diagram of a hexagonal flange bolt processed in the third step of the existing technology;

[0052] Figure 1G This is a top view of a hexagonal flange bolt processed in the third step of the existing technology;

[0053] Figure 2A This is a schematic diagram of the material cutting structure for processing hexagonal flange bolts in an embodiment of the present invention;

[0054] Figure 2B This is a schematic diagram of the structure of the hexagonal flange bolt processed in the first process of this invention embodiment;

[0055] Figure 2C This is a schematic diagram of the structure of the hexagonal flange bolt processed in the second step of this embodiment of the invention;

[0056] Figure 2D This is a top view of the hexagonal flange bolt processed in the second step of this embodiment of the invention;

[0057] Figure 3A This is a schematic diagram of the structure of the cold heading mold at the first station in an embodiment of the present invention;

[0058] Figure 3B This is a schematic diagram of the structure of a punch in an embodiment of the present invention;

[0059] Figure 3C yes Figure 3B Enlarged view of point A in the middle;

[0060] Figure 3D This is a schematic diagram of the structure of a lower mold in an embodiment of the present invention;

[0061] Figure 3E This is a schematic diagram of the structure of the first lower mold pad in an embodiment of the present invention;

[0062] Figure 4A This is a schematic diagram of the structure of the second station cold heading die in an embodiment of the present invention;

[0063] Figure 4B This is a schematic diagram of the structure of the two-stage punch in an embodiment of the present invention;

[0064] Figure 4C yes Figure 4B Enlarged view of point B in the middle;

[0065] Figure 4D yes Figure 4B A partial view of the ultra-hard region at point B in the middle;

[0066] Figure 4E This is a schematic diagram of the structure of the two-stage lower mold in an embodiment of the present invention;

[0067] Figure 4F This is a schematic diagram of the structure of the second lower mold pad in an embodiment of the present invention;

[0068] Figure 5 This is a flowchart illustrating the method for processing hexagonal flange bolts using the processing device in this embodiment of the invention. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0070] See Figures 2A to 4F In one embodiment of the present invention, a processing apparatus for hexagonal flange bolts is provided, including a cold heading machine, the processing apparatus further including:

[0071] The first station cold heading die 10 is installed on the cold heading machine to perform the first station cold heading process. The first station cold heading die 10 includes a first station upper die 11 and a first station lower die 12. The first station upper die 11 has a punch cavity 1131 that extrudes one end of the pre-made cutting material 30 into the pre-formed head 311 of the hexagonal flange bolt 33. The first station lower die 12 has a lower die cavity 1231 that extrudes the other end of the cutting material into the thread blank diameter 312 of the hexagonal flange bolt 33. After the first station cold heading process is completed, the pre-formed die material 31 of the hexagonal flange bolt 33 is produced.

[0072] The second-station cold heading die 20 is installed on the cold heading machine to perform the second-station cold heading process. The second-station cold heading die 20 includes a second-station upper die 21 and a second-station lower die 22. The second-station upper die 21 has a secondary punch cavity 2112 for extruding and expanding the pre-formed head 311 of the hexagonal flange bolt 33 into the hexagonal flange head 331 of the hexagonal flange bolt 33. The second-station lower die 22 has a secondary lower die cavity 2231 for extruding the thread blank diameter 312 into the tail end chamfer of the shank 332 of the hexagonal flange bolt 33. After completing the second-station cold heading process, the hexagonal flange bolt 33 is produced.

[0073] In this embodiment, the processing apparatus for the hexagonal flange bolt 33 includes a cold heading machine, a first-station cold heading die 10, and a second-station cold heading die 20. The first-station cold heading die 10 performs first-station cold heading processing and includes a first-station upper die 11 and a first-station lower die 12. The first-station upper die 11 has a first-stage punch cavity 1131 for extruding one end of the pre-cut material 30 into a pre-formed head 311 of the hexagonal flange bolt 33; while the first-station lower die 12 has a first-stage lower die cavity 1231 for extruding the other end of the cut material into a thread blank diameter 312 of the hexagonal flange bolt 33. Preferably, the preformed head 311 of the hexagonal flange bolt 33 is an inverted conical structure; wherein the top arc of the inverted conical structure is formed in the first-order punch cavity 1131, and the lower conical part of the inverted conical structure is formed in the first-order lower mold cavity 1231; this preformed structure is conducive to material flow during the upsetting process and helps with the pressure deformation of the next process.

[0074] The second-station cold heading die 20 performs the second-station cold heading process. The second-station cold heading die 20 includes a second-station upper die 21 and a second-station lower die 22. The second-stage punch cavity 2112 of the second-station upper die 21 is used to extrude and expand the pre-formed head 311 of the hexagonal flange bolt 33 into the hexagonal flange head 331 of the hexagonal flange bolt 33. The second-stage lower die cavity 2231 of the second-station lower die 22 is used to extrude the thread blank diameter 312 into the tail end chamfer of the shank 332 of the hexagonal flange bolt 33. After completing the second-station cold heading process, the hexagonal flange bolt 33 is manufactured. In the drawings of several embodiments of this application, the cold heading machine is not shown.

[0075] See Figures 2A to 4F In one embodiment of the present invention, the first station upper mold 11 includes:

[0076] The first spring seat 111 is fixed on the cold heading machine;

[0077] The first spring 112 is sleeved on the first spring seat 111; specifically, the first spring 112 is sleeved in the middle of the base of the first spring 112. After the first spring 112 is compressed by the first punch 113, it pushes the first punch 113 forward.

[0078] A first punch 113 is disposed at the front end of the first spring seat 111. One end of the first punch 113 has a first upper die ejector cavity 1132, and the other end has the first punch cavity 1131. The first punch cavity 1131 extrudes one end of the pre-made cutting material 30 into the pre-formed head 311 of the hexagonal flange bolt 33.

[0079] The first upper die ejector rod 114 is located at the front end of the first spring seat 111 and is inserted into the first upper die ejector rod cavity 1132. The first upper die ejector rod 114 can push the pre-made cutting material 30 in the punch cavity 1131. The pre-made cutting material 30 is usually cut into metal materials of a corresponding volume according to the size requirements of the hexagonal flange bolt 33.

[0080] A first-order punch sleeve 115 is fixed on the cold heading machine and sleeved on the outside of the first spring seat 111 and the first-order punch 113; the first-order punch 113 slides relative to the first-order punch sleeve 115; the first-order punch sleeve 115 can optionally be fixed on the cold heading machine by a locking screw.

[0081] The first station lower mold 12 includes:

[0082] The first lower die ejector pin seat 121 is located at the rear end of the lower die 12 at the first station and is fixed on the cold heading machine;

[0083] The first lower mold pad 122 is disposed at the front end of the first lower mold ejector seat 121, and a first channel cavity 1221 is formed on the first lower mold pad 122;

[0084] A first-order lower mold 123 is disposed at the front end of the first station lower mold 12, with the first-order lower mold cavity 1231 disposed at its front end and the second channel cavity 1232 disposed at its rear end.

[0085] The first lower mold ejector rod 124 extends from the first lower mold ejector rod seat 121 and passes through the first channel cavity 1221 and the second channel cavity 1232 in sequence. After the cold heading process at the first station is completed, the preformed mold material 31 is ejected.

[0086] In this embodiment, the cold heading process at the first station is the first step, which is a key forming step in this invention. This first step pre-forms the head and shank 332 of the hexagonal flange bolt 33. The first-order punch sleeve 115 is fixed to the cold heading machine with locking screws, and the first-order lower die 123 is also fixed to the cold heading machine with locking screws. Dies numbered 111 to 115 form an integral first-station upper die 11 structure. The first-order punch sleeve 115 and the first-order punch 113 can slide relative to each other. The upper die part reciprocates, and the metal material (i.e., the pre-formed cutting material 30) is extruded and deformed between the first-station upper die 11 and the first-station lower die 12. First, the cut metal material is transported between the upper and lower dies by the mechanical clamps of the cold heading machine. Then, the upper die 11 at the first station (111-115) begins to move towards the lower die 12 at the first station. The metal material is compressed and expanded in the cavity 1131 of the first punch, and compressed and contracted into the thread blank diameter 312 in the cavity 1231 of the first lower die. After the upper die 11 and the lower die 12 at the first station are fitted together, the pre-deformation of the bolt is completed. Then, the upper die 11 at the first station begins to move away from the lower die 12 at the first station. The ejector rod 124 of the first lower die pushes the pre-formed die material 31 out of the cavity 1231 of the lower die 123. The mechanical clamps of the cold heading machine clamp the pre-formed die material 31, preparing it to be transported to the cold heading die 20 at the second station for processing and deformation.

[0087] See Figures 2A to 4F In one embodiment of the present invention, the second station upper mold 21 includes:

[0088] The second punch 211 is fixed on the cold heading machine; its rear end is provided with a pad mold cavity 2111, and its front end is provided with the second punch cavity 2112;

[0089] The second spring 212 is sleeved on the rear end of the second-order punch 211; specifically, the second spring 212 is sleeved on the rear end of the second-order punch 211, and after the second spring 212 is compressed by the second-order punch 211, it pushes the second-order punch 211 forward.

[0090] The second upper mold pad 213 is disposed inside the pad mold cavity 2111 and slides relative to the pad mold cavity 2111;

[0091] A hexagonal push rod 214 is disposed within the pad mold cavity 2111 and located at the front end of the second upper mold pad 213. Furthermore, preferably, the front end of the hexagonal push rod 214 has a recessed cavity 2141, which forms a weight-reducing recess for the head of the hexagonal flange bolt 33. This weight-reducing recess reduces the weight of the weight-reducing recess, saving processing materials.

[0092] The second station lower mold 22 includes:

[0093] The second lower die ejector pin seat 221 is located at the rear end of the lower die 22 at the second work station and is fixed on the cold heading machine;

[0094] The second lower mold pad 222 is disposed at the front end of the second lower mold ejector seat 221, and a third channel cavity 2221 is provided on the second lower mold pad 222;

[0095] The second-order lower mold 223 is located at the front end of the second-station lower mold 22. The front end of the mold has the second-order lower mold cavity 2231, and the rear end has the fourth channel cavity 2232.

[0096] The second lower mold ejector rod 224 extends from the second lower mold ejector rod seat 221 and passes through the third channel cavity 2221 and the fourth channel cavity 2232 in sequence. After the cold heading process of the second station is completed, the preformed mold material 31 is ejected.

[0097] In this embodiment, the cold heading process at the second station is the second step, which is the final forming step of the present invention. The second-stage punch 211 is fixed to the cold heading machine by a limiting pin, and the second-stage lower die 223 is fixed to the cold heading machine by locking screws. The dies numbered 211 to 214 form an integral second-stage upper die 21 structure. The second-stage upper die 21 part reciprocates, and the pre-forming die material 31 from the first stage is extruded and deformed between the second-stage upper die 21 and the second-stage lower die 22. First, the preformed die 31 is transported by the mechanical clamps of a cold heading machine to the space between the upper die 21 and the lower die 22 at the second station. Then, 211-214, the upper die 21 at the second station begins to move closer to the lower die 22. The preformed die 31 is extruded and expanded within the cavity 2112 of the second-stage punch to form a hexagonal flange head 331. The hexagonal push rod 214 forms a weight-reducing recess 333 for the bolt head. The bolt shank 332 is extruded and chamfered within the cavity 2231 of the lower die. Once the upper die 21 and the lower die 22 at the second station are fitted together, the second-stage bolt deformation is complete, achieving the dimensional requirements of the hexagonal flange bolt 33.

[0098] In one embodiment of the present invention, preferably, the preformed head 311 of the hexagonal flange bolt 33 is an inverted conical structure; wherein the top arc of the inverted conical structure is formed in the first-order punch cavity 1131, and the lower conical part of the inverted conical structure is formed in the first-order lower mold cavity 1231.

[0099] See Figures 2A to 4F as well as Figure 5 In one embodiment of the present invention, a method for processing hexagonal flange bolts 33 using the processing apparatus described in any of the above embodiments is also provided, comprising:

[0100] Step S501: The pre-made cutting material 30 is transported to the first station upper die 11 and the first station lower die 12 of the first station cold heading mold 10; the first station upper die 11 moves towards the first station lower die 12, and the pre-made cutting material 30 is squeezed into the first punch cavity 1131 of the first station upper die 11 and the first lower die cavity 1231 of the first station lower die 12; after the first station upper die 11 and the first station lower die 12 are fitted together and the mold is opened, the pre-formed die material 31 of the hexagonal flange bolt 33 is formed; this step is the rough heading step;

[0101] In step S502, the preformed die material 31 is transported to the second station upper die 21 and the second station lower die 22 of the second station cold heading die 20; the second station upper die 21 moves towards the second station lower die 22, and the preformed die material 31 is squeezed into the second-order punch cavity 2112 of the second station upper die 21 and the second-order lower die cavity 2231 of the second station lower die 22; after the second station upper die 21 and the second station lower die 22 are fitted together and the die is opened again, the hexagonal flange bolt 33 is formed; this step is the fine heading step.

[0102] In this embodiment, a corresponding volumetric material is cut according to the dimensions of the hexagonal flange bolt 33; this material is made of a metal, such as copper or aluminum. The first-station cold heading die 10 is used to perform the first-station cold heading process. The first step of this processing method is the pre-forming of the head of the hexagonal flange bolt 33. The shank 332 of the hexagonal flange bolt is extruded and deformed into a thread blank diameter 312. The pre-formed head 311 of the hexagonal flange bolt 33 adopts an inverted conical structure. The top arc of the pre-formed head of the hexagonal flange bolt 33 is formed in the upper die cavity, and the lower conical part is formed in the lower die cavity. This pre-formed structure facilitates material flow during the upsetting process and helps with the pressure deformation in the next process. The second station cold heading die 20 is used to perform the second station cold heading process. The second step of this processing method is to upset the hexagonal flange face of the hexagonal flange bolt 33 and chamfer the tail end of the bolt shank 332 of the hexagonal flange bolt 33. This second step, through the combined extrusion of the upper die 21 of the second station and the lower die 22 of the second station, extrudes and upsets the pre-formed structure of the first step into the size requirements of the hexagonal flange bolt 33, and finally produces the hexagonal flange bolt 33.

[0103] In one embodiment of the present invention, the upper die 11 of the first station moves toward the lower die 12 of the first station, and the pre-made cutting material 30 is extruded into the first punch cavity 1131 of the upper die 11 of the first station and the first lower die cavity 1231 of the lower die 12 of the first station; after the upper die 11 of the first station and the lower die 12 of the first station are fitted together and then the mold is opened, the pre-formed die material 31 for making the hexagonal flange bolt 33 includes:

[0104] The upper mold 11 of the first station moves toward the lower mold 12 of the first station;

[0105] When the upper die 11 of the first station is fitted with the lower die 12 of the first station, the pre-made cutting material 30 is squeezed into the first punch cavity 1131 of the first punch 113 and the first lower die cavity 1231 of the first lower die 123, respectively extruding and forming the pre-formed head 311 of the hexagonal flange bolt 33 and the thread blank diameter 312 of the hexagonal flange bolt 33;

[0106] When the upper mold 11 and the lower mold 12 of the first station open, the upper mold 11 of the first station moves away from the lower mold 12 of the first station; the ejector rod 124 of the first lower mold ejects the preformed mold material 31 of the hexagonal flange bolt 33.

[0107] In this embodiment, the lower die 12 of the first station is fixed, while the upper die 11 of the first station moves toward the lower die 12. When the upper die 11 and the lower die 12 of the first station are in contact, the pre-cut material 30 is squeezed into the first punch cavity 1131 of the first punch 113 and the first lower die cavity 1231 of the first lower die 123, respectively squeezing and deforming the pre-formed head 311 and the thread blank diameter 312 of the hexagonal flange bolt 33, thus forming the pre-formed die material 31 of the hexagonal flange bolt 33. Because the pre-formed head 311 of this pre-formed die material 31 has an inverted conical structure, it facilitates material flow in the next process. This avoids the problem in the prior art four-process machining where, after the cold heading pre-forming of the head in the second and third processes, the metal material experiences severe work hardening, and the strength of the metal material increases with the increase of deformation, while the relative fluidity of the metal material decreases, adversely affecting the life of the stamping die in the fourth process.

[0108] In one embodiment of the present invention, the upper die 21 of the second station moves toward the lower die 22 of the second station, and the preformed die material 31 is extruded into the secondary punch cavity 2112 of the upper die 21 of the second station and the secondary lower die cavity 2231 of the lower die 22 of the second station; after the upper die 21 of the second station and the lower die 22 of the second station are fitted together and then the mold is opened, the hexagonal flange bolt 33 is formed by:

[0109] The upper mold 21 of the second station moves toward the lower mold 22 of the second station;

[0110] When the upper die 21 of the second station is fitted with the lower die 22 of the second station, the preformed die material 31 of the hexagonal flange bolt 33 is squeezed into the second punch cavity 2112 of the second punch 211 and the second lower die cavity 2231 of the second lower die 223, respectively extruding and forming the hexagonal flange head 331 and the tail end chamfer of the shank 332 of the hexagonal flange bolt 33;

[0111] When the upper mold 21 and the lower mold 22 of the second station open, the upper mold 21 of the second station moves away from the lower mold 22 of the second station; the ejector rod 224 of the second lower mold pushes out the hexagonal flange bolt 33.

[0112] In one embodiment of the present invention, the lower die 22 of the second station is fixed, and the upper die 21 of the second station moves toward the lower die 22 of the second station. When the upper die 21 of the second station and the lower die 22 of the second station are in contact, the preformed die material 31 is extruded into the second punch cavity 2112 of the second punch 211 and the second lower die cavity 2231 of the second lower die 223, that is, the preformed head 311 of the hexagonal flange bolt 33 is extruded to form the hexagonal flange head 331 of the hexagonal flange bolt 33; the thread blank diameter 312 of the hexagonal flange bolt 33 is extruded to form the tail end chamfer of the shank 332 of the hexagonal flange bolt 33; finally, after the upper die 21 of the second station and the lower die 22 of the second station are opened, the hexagonal flange bolt 33 is ejected by the second lower die ejector 224, thus completing the processing of the hexagonal flange bolt 33. Preferably, the front end of the hexagonal push rod 214 has a recessed cavity 2141, which forms a weight-reducing recess in the head of the hexagonal flange bolt 33. The head of the hexagonal flange bolt 33 thus processed has a weight-reducing recess.

[0113] Furthermore, in one embodiment of the present invention, a hexagonal flange bolt 33 processed by the processing device described in any of the above embodiments is also provided, and the head of the hexagonal flange bolt 33 has a weight-reducing recess 333.

[0114] Therefore, the processing apparatus and method described in the above embodiments of the present invention, which uses a lean cold heading forming process to produce hexagonal flange bolts 33, only requires two processing steps, two fewer than existing processing methods. This avoids the problem in the existing four-step process where the metal material suffers severe work hardening after the second and third steps of head cold heading pre-forming. This results in increased metal strength with increasing deformation, but relatively poor material flowability, negatively impacting the lifespan of the stamping die in the fourth step, thus improving processing efficiency. Furthermore, due to the weight-reducing recessed structure design of the head of the hexagonal flange bolt 33, its weight is reduced by 5% compared to hexagonal flange bolts 33 produced by existing forming processes, saving material. In addition, since the deformation process of the cold heading dies in the first and second stations is reduced from four steps to two, the cost of the cold heading dies is reduced by 50%, saving die costs and achieving lean production of the hexagonal flange bolt 33 cold forming process.

[0115] This invention configures a processing device for hexagonal flange bolts, comprising a first-station cold heading die, which includes a first-station upper die and a first-station lower die; and a second-station cold heading die, which includes a second-station upper die and a second-station lower die. The first-station cold heading die performs a first process of pre-forming the hexagonal flange bolt head, extruding and deforming the hexagonal flange bolt shank to form the thread blank diameter. The pre-formed head of the hexagonal flange bolt adopts an inverted conical structure, with the top arc of the pre-formed portion formed in the upper die cavity and the lower inverted conical portion formed in the lower die cavity. This pre-formed structure facilitates material flow during the upsetting process and aids in the subsequent pressure deformation process. The second-station cold heading die performs a second process of upsetting the hexagonal flange head and chamfering the tail end of the bolt shank. This second process, through the extrusion of the upper and lower dies, extrudes and upsets the pre-formed structure from the first process to meet the dimensional requirements of the hexagonal flange bolt. Furthermore, the head of the hexagonal flange bolt has a weight-reducing recess. Thus, this invention enables lean production of the cold forming process for hexagonal flange bolts.

[0116] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A device for machining hexagonal flanged face bolts, comprising a cold header, characterized in that, The processing device further comprises: A first station cold heading die is installed on the cold heading machine to perform first station cold heading processing, the first station cold heading die comprises a first station upper die and a first station lower die; the first station upper die has a first sequence punch cavity for extruding one end of a preformed cutting material into a preformed head of the hexagonal flange face bolt; the first station lower die has a first sequence lower die cavity for extruding the other end of the cutting material into a thread blank diameter of the hexagonal flange face bolt; after the first station cold heading processing is completed, a preformed die material of the hexagonal flange face bolt is formed; A second station cold heading die is installed on the cold heading machine to perform second station cold heading processing, the second station cold heading die comprises a second station upper die and a second station lower die; the second station upper die has a second sequence punch cavity for extruding the preformed head of the hexagonal flange face bolt to expand into a hexagonal flange face head of the hexagonal flange face bolt; the second station lower die has a second sequence lower die cavity for extruding the thread blank diameter into a tail chamfer of a rod part of the hexagonal flange face bolt; after the second station cold heading processing is completed, the hexagonal flange face bolt is formed; The preformed head of the hexagonal flange face bolt is in an inverted cone structure; wherein a top circular arc of the inverted cone structure is formed in the first sequence punch cavity, and a lower conical part of the inverted cone structure is formed in the first sequence lower die cavity.

2. The processing apparatus of claim 1, wherein The first station upper die comprises: A first spring seat is fixed on the cold heading machine; A first spring is sleeved on the first spring seat; A first sequence punch is arranged at the front end of the first spring seat, one end of the first sequence punch has a first upper die ejector pin cavity, and the other end has the first sequence punch cavity; A first upper die ejector pin is arranged at the front end of the first spring seat and inserted into the first upper die ejector pin cavity; A first sequence punch sleeve is fixed on the cold heading machine and sleeved outside the first spring seat and the first sequence punch; the first sequence punch slides relative to the first sequence punch sleeve; The first station lower die comprises: A first lower die ejector pin seat is arranged at the rear end of the first station lower die and fixed on the cold heading machine; A first lower die pad is arranged at the front end of the first lower die ejector pin seat, and a first passage cavity is formed in the first lower die pad; A first sequence lower die is arranged at the front end of the first station lower die, and a second passage cavity is arranged at the rear end of the first sequence lower die; A first lower die ejector pin is extended from the first lower die ejector pin seat, sequentially passes through the first passage cavity and the second passage cavity, and ejects the preformed die material after the first station cold heading processing is completed.

3. The apparatus of claim 1 wherein, The second station upper die comprises: A second sequence punch is fixed on the cold heading machine; a pad die cavity is arranged at the rear end of the second sequence punch, and the second sequence punch cavity is arranged at the front end of the second sequence punch; A second spring is sleeved on the rear end of the second sequence punch; A second upper die pad is arranged in the pad die cavity and slides relative to the pad die cavity; A hexagonal push rod is arranged in the pad die cavity and located at the front end of the second upper die pad; The second station lower die comprises: Second lower die ejector pin seat, arranged at the rear end of the second station lower die, and fixed on the cold header; Second lower die pad, arranged at the front end of the second lower die ejector pin seat, and a third passage cavity is formed in the second lower die pad; Second lower die, arranged at the front end of the second station lower die, and a second lower die cavity is formed at the front end of the second lower die, and a fourth passage cavity is formed at the rear end of the second lower die; Second lower die ejector pin, extended from the second lower die ejector pin seat, and sequentially passing through the third passage cavity and the fourth passage cavity, and ejecting the preformed die after completing the second station cold heading process.

4. The processing apparatus of claim 3, wherein The front end of the hexagonal push rod has a concave cavity, and the concave cavity forms a weight-reducing concave cavity of the hexagonal flange surface bolt head.

5. A method of machining a hexagonal flange face bolt by using the machining device according to any one of claims 1 to 4, characterized by, Comprise: The preformed cutting material is transported between the first station upper die and the first station lower die of the first station cold heading die; the first station upper die moves towards the first station lower die, and the preformed cutting material is extruded into a first sequence punch cavity of the first station upper die and a first sequence lower die cavity of the first station lower die; after the first station upper die and the first station lower die are closed and opened, the preformed die of the hexagonal flange surface bolt is manufactured; The preformed die is transported between the second station upper die and the second station lower die of the second station cold heading die; the second station upper die moves towards the second station lower die, and the preformed die is extruded into a second sequence punch cavity of the second station upper die and a second sequence lower die cavity of the second station lower die; after the second station upper die and the second station lower die are closed and opened, the hexagonal flange surface bolt is manufactured; The preformed head of the hexagonal flange surface bolt is in an inverted cone structure; wherein the top arc of the inverted cone structure is formed in the first sequence punch cavity, and the lower conical part of the inverted cone structure is formed in the first sequence lower die cavity.

6. The method of claim 5, wherein, The first station upper die moves towards the first station lower die, and the preformed cutting material is extruded into a first sequence punch cavity of the first station upper die and a first sequence lower die cavity of the first station lower die; after the first station upper die and the first station lower die are closed and opened, the preformed die of the hexagonal flange surface bolt is manufactured, comprising: The first station upper die moves towards the first station lower die; When the first station upper die and the first station lower die are closed, the preformed cutting material is extruded into a first sequence punch cavity of the first sequence punch and a first sequence lower die cavity of the first sequence lower die, respectively extruding a preformed head of the hexagonal flange surface bolt and a thread blank diameter of the hexagonal flange surface bolt; When the first station upper die and the first station lower die are opened, the first station upper die moves away from the first station lower die; the first lower die ejector pin ejects the preformed die of the hexagonal flange surface bolt.

7. The method of claim 6, wherein, The second station upper die moves towards the second station lower die, and the preformed die is extruded into a second sequence punch cavity of the second station upper die and a second sequence lower die cavity of the second station lower die; after the second station upper die and the second station lower die are closed and opened, the hexagonal flange surface bolt is manufactured, comprising: The second upper die moves towards the second lower die; When the second upper die and the second lower die are closed, the preformed material of the hexagonal flange face bolt is extruded into the second sequence punch cavity of the second sequence punch and the second sequence lower die cavity of the second sequence lower die, respectively, to form the head of the hexagonal flange face bolt and the tail end chamfer of the rod of the hexagonal flange face bolt; When the second upper die and the second lower die are opened, the second upper die moves away from the second lower die, and the second lower die ejector pin ejects the hexagonal flange face bolt.

8. The method of claim 7, wherein, The front end of the hexagonal push rod has a concave cavity which forms the weight-reducing concave of the head of the hexagonal flange face bolt.

9. A hexagonal flange face bolt processed by the processing device of any one of claims 1-4.

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