Disc-shaped material drawing process and device for high-strength bolts

Abstract

This invention relates to the field of bolt processing and manufacturing technology. It discloses a process and apparatus for drawing coiled alloy steel for high-strength bolts, comprising the following steps: Coiled alloy steel is cold-drawn and straightened using a straightening mechanism to obtain the prepared alloy steel; the prepared alloy steel is then conveyed to a cutting mechanism for cutting, with the cut portion overlapping a clamping ring; during the cutting process by the cutting head, the clamping ring rotates and forms a support point on the back of the cut point, while pressing against the cut point on the front. The rotatable clamping ring, in conjunction with the cutting head, forms a bidirectional force-bearing cutting structure. The cutting head applies pressure on the front of the cut point, while the cutting blade on the clamping ring forms a fixed-point support on the back of the cut point, achieving clamp-type shearing fracture of the steel. Simultaneously, the eccentrically designed double virtual circle structure causes slight bending and limiting of the steel during cutting, preventing steel deviation and twisting during the shearing process.

Description

Technical Field

[0001] This invention relates to the field of bolt processing and manufacturing technology, specifically to a process and apparatus for drawing high-strength bolt coils. Background Technology

[0002] High-strength bolts are manufactured using alloy steel as raw material. Before cutting, alloy steel must undergo pre-processing steps such as cold drawing and straightening, and fixed-length cutting to obtain qualified alloy steel billets for subsequent bolt forging and precision machining. Currently, most traditional coil drawing and cutting devices on the market use a single straight-push cutting head for unidirectional shearing in actual production. During the cutting operation, the cutting head only applies pressure to one side of the alloy steel, and the cutting point lacks support. As a result, the alloy steel is prone to irregular displacement and twisting during the shearing process, and the steel is subjected to uneven stress, which easily leads to defects such as burrs, skewed cuts, and uneven cross-sections. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a process and apparatus for drawing high-strength bolts from coils, which solves the problems of burrs, skewed cuts, uneven cross-sections, and other defects that easily occur during the shearing process of existing alloy steel.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-strength bolt coil drawing process, comprising the following steps: ① coiled alloy steel is cold-drawn and straightened by a straightening mechanism to obtain prepared alloy steel; ② the prepared alloy steel is conveyed to a cutting mechanism for cutting, and the cut end of the prepared alloy steel overlaps on a clamping ring; ③ during the cutting process of the prepared alloy steel to be cut by the cutting head, the clamping ring rotates and forms a support point on the back of the cut point of the prepared alloy steel, and the cut point of the prepared alloy steel is pressed against it.

[0005] A high-strength bolt coiled material pulling device includes a material pulling area and a material cutting area located on both sides of a frame. The material pulling area is equipped with a bridging mechanism, and the material cutting area is equipped with a material cutting mechanism, including a side plate. A propulsion cylinder is located on the back of the side plate, and a material cutting head penetrating the side plate is located at the output end of the propulsion cylinder. The material cutting mechanism further includes a guide box fixed to the front side of the side plate. The guide box has a through-hole for alloy steel to pass through, and the material cutting head is located at the output end of the guide hole. A rotatable rotating ring is rotatably arranged inside the guide hole, and a clamping ring for positioning during alloy steel cutting is circumferentially arranged within the rotating ring's inner cavity.

[0006] The clamping ring includes a left positioning arc plate and a right positioning arc plate fixed on both sides of the inner cavity of the rotating ring, a material-blocking arc plate fixed above the inner cavity, and a material-pushing arc plate elastically connected to the lower side of the inner cavity by a second spring. The material-blocking arc plate is provided with a cutting blade at the outer edge of the output end of the material guide cavity. The inner edges of the left and right positioning arc plates are located on the circumference of the same virtual circle, and the inner edge of the material-blocking arc plate and the inner edge of the material-pushing arc plate in the popped-up state are located on the circumference of the same virtual circle.

[0007] Preferably, a notch is formed above the inner edge of the right positioning arc piece, one end of the notch smoothly transitions to the inner edge of the right positioning arc piece, and the other end connects to the end of the material-stopping arc piece.

[0008] Preferably, the outer side of the cutting blade protrudes inward to form a cutting edge.

[0009] Preferably, the guide box includes a first shell and a second shell fixed to each other. The first shell has a hollow cavity inside, and a gear ring fixed on the rotating ring is disposed in the hollow cavity. The top of the hollow cavity has an upper opening, and a gear that meshes with the gear ring is rotatably connected in the upper opening. A motor that drives the gear to rotate is disposed on the top of the guide box.

[0010] Preferably, a feed guide cylinder is provided on the outside of the feed cavity of the second housing, and an outer flange is provided on the outside of the feed cavity of the first housing. The rotating ring is rotatably connected to the second housing and the outer flange respectively.

[0011] The first housing has a first snap tooth in its circumferential direction, and the second housing has a second snap tooth in its circumferential direction, and the first snap tooth and the second snap tooth engage with each other.

[0012] Preferably, a side plate is provided at the end of the side plate away from the guide box. The side plate is perpendicular to the side plate. A sleeve passes through the side plate. A shaft is provided inside the sleeve. An end plate is provided at one end of the shaft located in the guide box. A first spring is sleeved on the shaft. The two ends of the first spring are respectively connected to the end plate and the sleeve.

[0013] Preferably, a receiving tray is provided on the material cutting area, and one end of the receiving tray is located below the material cutting mechanism.

[0014] Preferably, a partition plate is provided between the straightening mechanism and the material cutting mechanism, and the partition plate is provided with perforations.

[0015] The beneficial effects of this invention are as follows: By using the high-strength bolt coil shearing process and device provided by this invention, a bidirectional force-bearing cutting structure is formed through a rotatable clamping ring and a cutting head. The cutting head applies pressure to the front of the cutting point, while the cutting edge on the clamping ring forms a fixed-point support on the back of the cutting point, achieving clamping-type shearing fracture of the steel. Simultaneously, the eccentrically designed double virtual circle structure causes the steel to bend slightly and be limited during cutting, preventing the steel from shifting or twisting during the shearing process. The protruding cutting edge on the outer side of the cutting blade concentrates the supporting stress, allowing the steel to fracture precisely along the cutting edge, effectively eliminating problems such as burrs, skewing, unevenness, etc., ensuring a smooth and flat cut, and meeting the high-precision cross-section processing requirements of high-strength bolt raw materials.

[0016] A notch is set on the inner side of the right positioning arc plate, so that the steel can be smoothly transitioned along the notch when bending and shifting, and the steel can be prevented from getting stuck during the cutting process; a pusher arc plate with a second spring is set inside the clamping ring, so that an elastic pushing force can be applied to the material segment after cutting, so that the cut steel falls in a directional and stable manner. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention;

[0018] Figure 2 This is a top view of the material cutting mechanism of the present invention;

[0019] Figure 3 This is a top view of the discharge box of the present invention;

[0020] Figure 4 For the present invention Figure 3 Sectional view along line AA;

[0021] Figure 5 This is a front view of the clamping ring of the present invention;

[0022] Figure 6 This is a schematic diagram showing the positions of the left and right positioning arc plates of the present invention;

[0023] Figure 7 This is a three-dimensional structural diagram of the left and right positioning arc plates of the present invention;

[0024] Figure 8 This is a schematic diagram showing the position of the pusher arc and the stop arc of the present invention;

[0025] Figure 9 This is a schematic diagram of the three-dimensional structure of the pusher arc plate and the stop arc plate of the present invention;

[0026] Figure 10 This is a schematic diagram showing the position of the clamping ring before cutting the alloy steel according to the present invention;

[0027] Figure 11 This is a schematic diagram showing the position of the clamping ring when cutting alloy steel according to the present invention.

[0028] The following are the annotations in the attached diagram: 1. Material pulling area; 2. Bridge straightening mechanism; 3. Divider plate; 4. Perforation; 5. Material cutting area; 6. Material cutting mechanism; 7. Receiving tray; 8. Side upright plate; 9. Pushing cylinder; 10. Material cutting head; 11. Side upright plate; 12. Sleeve; 13. Shaft; 14. First spring; 15. End plate; 16. First housing; 17. Second housing; 18. Feed guide cylinder; 19. Hollow cavity; 20. Gear ring; 21. Rotary ring; 22. Clamping ring; 221. Left positioning arc plate; 222. Right positioning arc plate; 223. Pushing arc plate; 224. Stopping arc plate; 225. Cutting blade; 226. Notch; 227. Second spring; 228. Cutting edge; 23. Outer flange; 24. First snap tooth; 25. Second snap tooth; 26. Motor; 27. Gear; 28. Upper opening mouth. Detailed Implementation

[0029] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Various changes can be made to the implementation schemes as long as the effects of the present invention can be achieved.

[0031] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0032] like Figures 1-11 The diagram shows a process for drawing high-strength bolt coils, comprising the following steps:

[0033] ① The alloy steel is prepared by cold drawing and straightening of the coiled alloy steel through the bridge straightening mechanism 2;

[0034] ② After the alloy steel is output through the bridge straightening mechanism 2, it is directly conveyed to the cutting mechanism 6 for segmented cutting. The cutting part of the alloy steel overlaps on the clamping ring 22, and the end abuts against the end plate 15 to limit the length, so that the alloy steel cut each time is of uniform length.

[0035] ③ During the cutting process of the alloy steel to be cut by the cutting head 10, the clamping ring 22 rotates and forms a support point on the back of the cutting point of the alloy steel. During the movement of the cutting head 10, it clamps the alloy steel to form a fracture by aligning with the support point. The clamping ring 22 also presses against the front of the cutting point of the alloy steel, applying an elastic pushing force to the cut part of the alloy steel, so that the cut part falls in a directional and stable manner.

[0036] It should be noted that in step ③, the side of the cutting head 10 that contacts the alloy steel being prepared is the front of the cutting point, and the other side is the back of the cutting point.

[0037] To achieve the above process, an embodiment of a high-strength bolt coil drawing device is also disclosed. Specifically, it includes a frame and drawing zone 1 and cutting zone 5 located on both sides of the frame. A straightening mechanism 2 is provided in the drawing zone 1 to cold-draw and straighten the coiled alloy steel. A cutting mechanism 6 is provided in the cutting zone 5 to segmentally cut the cold-drawn and straightened alloy steel. In use, the alloy steel, cold-drawn and straightened by the straightening mechanism 2, directly enters the cutting mechanism 6 for direct cutting under the continuous conveying of the straightening mechanism 2, eliminating the need for transfer and improving processing efficiency.

[0038] In one exemplary embodiment, the material cutting mechanism 6 includes a side plate 8, with a propulsion cylinder 9 disposed on the back of the side plate 8. A material cutting head 10, penetrating the side plate 8, is disposed at the output end of the propulsion cylinder 9. Furthermore, the material cutting mechanism 6 includes a guide box fixed to the front side of the side plate 8. The guide box has a through-hole for alloy steel to pass through, and the direction of the guide hole is consistent with the conveying direction of the alloy steel. The material cutting head 10 is located at the output end of the guide hole. A rotating ring 21, which can be driven to rotate, is rotatably disposed inside the guide hole. A clamping ring 22, used for positioning during alloy steel cutting, is circumferentially disposed within the inner cavity of the rotating ring 21. During operation, as the alloy steel is cut by the cutting head 10, the clamping ring 22 rotates and forms a support point on the back of the cutting point of the alloy steel. As the cutting head 10 travels, it clamps the alloy steel against the support point to form a fracture. The clamping ring 22 also presses against the front of the cutting point of the alloy steel, applying an elastic pushing force to the cut part of the alloy steel, so that the cut part falls in a directional and stable manner.

[0039] To achieve the above objectives, in one exemplary embodiment of the clamping ring 22, such as... Figure 4 and Figure 5As shown, it includes a left positioning arc plate 221 and a right positioning arc plate 222 fixed on both sides of the inner cavity of the rotating ring 21, a material-blocking arc plate 224 fixed above the inner cavity, and a material-pushing arc plate 223 elastically connected to the lower side of the inner cavity by a second spring 227. The material-blocking arc plate 224 is provided with a cutting blade 225 at the outer edge of the output end of the guide cavity. The inner edges of the left positioning arc plate 221 and the right positioning arc plate 222 are located on the circumference of the same virtual circle, which is the first virtual circle. When the alloy steel is entered into the clamping ring 22, it overlaps between the left positioning arc plate 221 and the right positioning arc plate 222. The virtual circle between the left positioning arc plate 221 and the right positioning arc plate 222 is concentric and coaxial with the guide cavity, so that the alloy steel can extend forward smoothly. The inner edge of the material-blocking arc plate 224 and the inner edge of the material-pushing arc plate 223 in the spring-up state are located on the circumference of the same virtual circle, which is the second virtual circle. The first virtual circle and the second virtual circle are set to be eccentric.

[0040] When the alloy steel is cut after extending to a predetermined length, the rotating ring 21 rotates, and the left positioning arc plate 221 and the right positioning arc plate 222 are rotated from the left-right position to the up-down position, while the stop arc plate 224 and the push arc plate 223 are rotated from the up-down position to the left-right position. During its travel, the cutting head 10 pushes the alloy steel, causing a slight bend. At this time, the cut portion is bent into the second virtual circle, and the back side of the alloy steel at the cutting position contacts the cutting blade 225. The cutting head 10 and the support point align to clamp the alloy steel and break it. After cutting, the rotating ring 21 rotates in the opposite direction to reset.

[0041] In order to concentrate the support force on the back of the alloy steel, a cutting edge 228 is formed by protruding inward on the outside of the cutting blade 225. The back of the alloy steel at the cutting position contacts the cutting edge 228. When the alloy steel breaks, its back will break at the cutting edge 228. This not only provides a fixed support point for the back of the alloy steel, but also makes the cut neat.

[0042] It should be noted that a notch 226 is formed above the inner edge of the right positioning arc plate 222. One end of the notch 226 smoothly transitions to the inner edge of the right positioning arc plate 222, and the other end connects to the end of the stop arc plate 224. The purpose is to allow the alloy steel to smoothly enter the second virtual circle by following the inner edge of the notch 226 when it is pushed in and slightly bent, without getting stuck.

[0043] In one exemplary embodiment, the guide box comprises a first housing 16 and a second housing 17 fixed to each other. The first housing 16 has a hollow cavity 19 inside, and a gear ring 20 fixed to a rotating ring 21 is disposed within the hollow cavity 19. The combined arrangement of the first housing 16 and the second housing 17 facilitates the processing of the hollow cavity 19, as well as the installation of the rotating ring 21 and the gear ring 20, and the installation of the clamping ring 22 within the hollow cavity 19. Furthermore, an upper opening 28 is provided at the top of the hollow cavity 19, and a gear 27 rotatably connected to the upper opening 28 meshes with the gear ring 20. A motor 26 driving the gear 27 to rotate is disposed at the top of the guide box, and a reducer is disposed at the output end of the motor 26. During operation, the motor 26 drives the gear 27 and the gear ring 20 to rotate, and the gear ring 20 drives the rotating ring 21 to rotate, thereby realizing the reciprocating rotation of the clamping ring 22.

[0044] like Figure 2 and Figure 3 As shown, a feed guide cylinder 18 is provided on the outside of the feed cavity of the second housing 17, and an outer flange 23 is provided on the outside of the feed cavity of the first housing 16. A rotating ring 21 is rotatably connected to the second housing 17 and the outer flange 23 respectively. A first snap tooth 24 is provided circumferentially on the first housing 16, and a second snap tooth 25 is provided circumferentially on the second housing 17. The first snap tooth 24 and the second snap tooth 25 are interlocked.

[0045] like Figure 2 As shown, a limiting mechanism is provided at the end of the side plate 8 away from the guide box to limit the extension length (i.e., cutting length) of the alloy steel. This mechanism includes a side plate 11 fixed perpendicularly to the side plate 8, with a sleeve 12 passing through it. The outer wall of the sleeve 12 is threaded, and the sleeve 12 is fixed by being clamped to both sides of the side plate 11 by nuts. A shaft 13 passes through the sleeve 12, and an end plate 15 is provided at one end of the shaft 13 located in the guide box. The outer side of the end plate 15 is the mounting surface for a contact sensor (not shown in the figure). A first spring 14 is sleeved on the shaft 13, and the two ends of the first spring 14 are respectively connected to the end plate 15 and the sleeve 12. When the extended end of the alloy steel abuts against the contact sensor on the end plate 15, the propulsion cylinder 9 drives the cutting head 10 to advance and perform the cutting operation. To prevent the alloy steel from continuing to advance after contact and causing hard resistance, the alloy steel moves the shaft 13 backward within the sleeve 12 and compresses the first spring 14 while continuing to advance slightly. After the cutting operation is completed, the shaft 13 and the end plate 15 are reset by the elastic reset of the first spring 14.

[0046] A receiving tray 7 is provided on the cutting zone 5. The receiving tray 7 is set at an angle, with one end of the receiving tray 7 located below the cutting mechanism 6. The cut part falls onto the receiving tray 7 and slides to one side to discharge.

[0047] like Figure 1As shown, a partition plate 3 is provided between the straightening mechanism 2 and the cutting mechanism 6 to separate the two working areas. The partition plate 3 is provided with a through hole 4, which is located on the same straight line as the discharge end of the straightening mechanism 2 and the feed guide cylinder 18 of the cutting mechanism 6.

[0048] The working principle of the device is as follows: the coiled alloy steel is first fed into the straightening mechanism in the drawing zone, where it is cold-drawn and straightened to form a regular alloy steel. After straightening, the alloy steel passes through the perforation on the partition plate under the continuous conveying power of the straightening mechanism and is straightened into the feed guide cylinder of the cutting mechanism in the cutting zone, and directly enters the guide cavity inside the guide box.

[0049] The motor, in conjunction with the reducer, drives the gear to rotate. The gear meshes with the gear ring inside the hollow cavity, causing the rotating ring to rotate within the guide box. The clamping ring inside the rotating ring rotates synchronously with the rotating ring, causing the left and right positioning arc plates, which were initially arranged on the left and right sides of the clamping ring, to rotate to the up and down positions. The material blocking arc plates and pushing arc plates, which were originally arranged on the up and down sides, rotate to the left and right positions.

[0050] The hydraulic cylinder drives the cutting head through the side plate to the output end of the guide cavity. The cutting head acts on the front of the cutting point of the alloy steel, applying a pushing force to the alloy steel, causing the cutting position of the alloy steel to be slightly bent and smoothly enter the second virtual circle along the notch of the right positioning arc plate without any jamming.

[0051] At this time, the cutting edge of the cutting blade on the inner side of the retaining arc plate on the clamping ring fits tightly against the back of the alloy steel cutting point to form a fixed support point. The cutting head applies pressure from the front and the cutting edge provides fixed support from the back. The clamping force from both sides forms a shearing fracture. The protruding structure of the cutting edge can concentrate the supporting stress, allowing the alloy steel to break neatly along the cutting edge position, ensuring the flatness of the cut.

[0052] After the alloy steel is cut, the pusher arc plate on the lower side of the clamping ring applies an elastic pushing force to the cut alloy steel segment under the elastic action of the second spring, so that the segment maintains a directional and stable posture and leaves the work station, falling vertically onto the inclined receiving tray below; the segment slides automatically along the inclined receiving tray by its own gravity, completing the orderly discharge and collection.

[0053] The basic principles, main features, and advantages of the present invention have been described above. However, the above description is only a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

[0054] In the description of this invention, each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. As the apparatus disclosed in the embodiments corresponds to the methods disclosed in the embodiments, the description is relatively simple, and relevant parts can be referred to the method section.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A process for the production of a disc round for high strength bolts, characterized in that, It comprises the following steps: ①the disc round alloy steel is straightened by the bridge straightening mechanism to obtain the prepared alloy steel; ②the prepared alloy steel is transported to the cutting mechanism to cut, and the cutting part of the prepared alloy steel is overlapped on the clamping ring; ③during the cutting process of the prepared alloy steel by the cutting head, the clamping ring rotates and forms a support point on the back of the cutting point of the prepared alloy steel, and the front of the cutting point of the prepared alloy steel is pressed.

2. A high strength bolt disc round drawing device for use in the process of claim 1, characterized by: It comprises a pulling area and a cutting area arranged on both sides of the frame, the pulling area is provided with a bridge straightening mechanism, the cutting area is provided with a cutting mechanism, and the cutting mechanism comprises a side stand plate, the back of the side stand plate is provided with a pushing oil cylinder, the output end of the pushing oil cylinder is provided with a cutting head penetrating through the side stand plate; the cutting mechanism further comprises a guide box fixed on the front side of the side stand plate, the inner cavity of the guide box is provided with a guide cavity for the alloy steel to pass through, and the cutting head is located at the output end of the guide cavity; a rotating ring driven to rotate is arranged inside the guide cavity, and the inner cavity of the rotating ring is provided with a clamping ring for positioning the alloy steel during cutting in a circumferential direction; The clamping ring comprises left and right positioning arc pieces fixed on both sides of the inner cavity of the rotating ring, a blocking arc piece fixed above the inner cavity, and a pushing arc piece elastically connected to the lower side of the inner cavity by a second spring, and the blocking arc piece is provided with a cutting knife at the outer edge of the output end of the guide cavity; wherein the inner edges of the left and right positioning arc pieces are located on the circumference of the same virtual circle, and the inner edges of the blocking arc piece and the pushing arc piece in the elastic state are located on the circumference of the same virtual circle.

3. A high strength bolt disc round drawing device as claimed in claim 2, wherein: A notch is formed above the inner edge of the right positioning arc piece, one end of the notch is smoothly connected with the inner edge of the right positioning arc piece, and the other end is connected with the end of the blocking arc piece.

4. A high strength bolt disc round drawing device as claimed in claim 2, wherein: The outer side of the cutting knife is inwardly protruded to form a blade.

5. A high strength bolt disc round drawing device as claimed in claim 2, wherein: The guide box comprises a first shell and a second shell fixed with each other, a hollow cavity is arranged in the first shell, a gear ring fixed on the rotating ring is arranged in the hollow cavity, an upper open cavity is arranged at the top of the hollow cavity, a gear meshing with the gear ring is rotatably connected in the upper open cavity, and a motor driving the gear to rotate is arranged at the top of the guide box.

6. A high strength bolt disc round drawing device as claimed in claim 5, wherein: An inlet guide cylinder is arranged outside the guide cavity of the second shell, an outer flange is arranged outside the guide cavity of the first shell, and the rotating ring is rotatably connected to the second shell and the outer flange respectively; A first clamping tooth is arranged in the circumferential direction of the first shell, a second clamping tooth is arranged in the circumferential direction of the second shell, and the first clamping tooth and the second clamping tooth are mutually clamped.

7. A high strength bolt disc round drawing device as claimed in claim 2, wherein: An edge stand plate is arranged at one end of the side stand plate away from the guide box, the edge stand plate is arranged perpendicularly to the side stand plate, a sleeve is penetratingly arranged on the edge stand plate, a shaft rod is penetratingly arranged in the sleeve, an end plate is arranged at one end of the shaft rod, a first spring is sleeved on the shaft rod, and the two ends of the first spring are connected to the end plate and the sleeve respectively.

8. A high strength bolt disc round drawing device as claimed in claim 2, wherein: A receiving disc is arranged on the cutting area, and one end of the receiving disc is located below the cutting mechanism.

9. A high strength bolt disc round drawing device as claimed in claim 2, wherein: A partition plate is arranged between the bridge straightening mechanism and the cutting mechanism, and a through hole is arranged on the partition plate.

Images