A screw grooving device and its grooving process

Abstract

This invention provides a screw grooving device and its grooving process. The screw grooving device includes: a lifting and clamping device comprising a rotating device, horizontally driven devices evenly distributed around the rotating device, a vertically driven device mounted on the horizontally driven device, and a clamping device on top of the vertically driven device; a conveying device comprising a parallel feeding conveying mechanism and a discharging conveying mechanism, one end of the feeding conveying mechanism being located on one side of the rotating device, and one end of the discharging conveying mechanism being located on the other side of the rotating device; and a double-headed milling device comprising two grooving cutters located on the upper side of the rotating device, and respectively located on the extension lines of the conveying directions of the feeding and discharging conveying mechanisms. By using the lifting and clamping device in conjunction with the double-headed milling device, the technical problem of burrs easily appearing during the secondary milling process of screws produced by cold heading in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of screw manufacturing technology, and in particular to a screw grooving device and its grooving process. Background Technology

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

[0003] Screws produced by cold heading generally require grooving. The most common grooving method is milling. The metal material produced by cold heading is generally softer and easier to shape. Therefore, during milling, the metal is squeezed and deformed, which can easily cause burrs to appear on one side of the groove. Although the presence of these burrs does not affect the normal use of the screw, it will lead to a reduction in the quality or appearance of the screw. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a screw grooving device and its grooving process, which solves the technical problem that screws produced by cold heading are prone to burrs during secondary milling.

[0005] A screw grooving device according to an embodiment of the present invention includes:

[0006] Lifting and clamping device: includes a rotating device, a horizontal drive device evenly distributed around the rotating device, a vertical drive device mounted on the horizontal drive device, and a clamping device on the top of the vertical drive device.

[0007] Conveying device: includes a feeding conveyor and a discharging conveyor arranged in parallel, with one end of the feeding conveyor located on one side of the rotating device and one end of the discharging conveyor located on the other side of the rotating device;

[0008] Double-head milling device: includes two grooving cutters, which are located on the upper side of the rotating device and on the extension lines of the feeding conveyor and the discharging conveyor respectively.

[0009] The technical principle of this invention is as follows: the screw is turned 180 degrees by a rotating device, so that its direction is reversed when it passes through two slotting milling cutters.

[0010] A horizontal drive mechanism ensures that the screw can pass through the grooving cutter to achieve grooving.

[0011] The vertical drive is used to disengage the screw from the slotting cutter when the first slotting is halfway done, thus completing only half of the slotting.

[0012] The screw is clamped by a clamping device to ensure that it does not move during grooving.

[0013] The conveying device is designed to enable the automatic feeding, lifting, and clamping of screws, thus achieving automated and mass production.

[0014] Compared with the prior art, the present invention has the following beneficial effects: by using a lifting clamping device in conjunction with a double-head milling device, it solves the technical problem that burrs are easily generated when screws produced by cold heading are processed in the secondary milling process in the prior art.

[0015] Furthermore, both the feeding conveyor and the discharging conveyor include two parallel conveyor belts, with a gap between the two conveyor belts for fixing screws.

[0016] Furthermore, the rotating device includes a rotating disk and a rotating motor that is connected to the rotating disk in a transmission manner.

[0017] Furthermore, when the horizontal drive device is located below the slotting milling cutter, the feed direction of the horizontal drive device is parallel to the conveying direction of the feeding conveyor and the discharging conveyor.

[0018] A horizontal drive device is used to drive the movement of the screw during slotting, and also to transport the screw in and out of the lifting clamping device.

[0019] Furthermore, the horizontal drive device is an electric slide rail, the vertical drive device is a telescopic cylinder, the clamping device is a clamping cylinder, and the center of the rotating disk is provided with a pneumatic system for driving the telescopic cylinder and the clamping cylinder.

[0020] Furthermore, the rotating disk is evenly distributed with metal elastic sheets on its edge, and a protective shell is provided on the outer side of the rotating disk. A metal connecting piece is provided on the protective shell corresponding to the metal elastic sheet. The metal connecting piece is electrically connected to the main power supply, and the metal elastic sheet is electrically connected to the horizontal drive device and the pneumatic system. The metal connecting piece is in close contact with the metal elastic sheet.

[0021] By using a connection method of metal elastic sheet and metal connecting sheet, the problem of wired power supply for the equipment on the rotating disk is solved, while ensuring that the rotating disk can rotate in an infinite clockwise direction.

[0022] Furthermore, the pneumatic system is provided with a protective inner shell, and the protective outer shell has an opening near the feeding conveyor and the discharging conveyor, and the protective outer shell encloses the double-head milling device.

[0023] Furthermore, the dual-head milling device also includes a milling motor, which is connected to a drive pulley. Two driven pulleys are driven to both sides of the drive pulley, and clamping heads are driven to the driven pulleys. The two clamping heads respectively clamp two slotting milling cutters.

[0024] Furthermore, the bottom of the slotting cutter near the feeding conveyor is at a higher horizontal height than the bottom of the other slotting cutter; the conveying plane of the feeding conveyor is higher than the conveying plane of the discharging conveyor.

[0025] A grooving process for a screw grooving device according to an embodiment of the present invention includes:

[0026] S1. Feeding: The feeding conveyor conveys the screw to the rotating device, and then the vertical drive device rises and the clamping device clamps the screw.

[0027] S2, First processing: The horizontal drive device drives the screw close to the grooving cutter. When the grooving cutter cuts halfway into the screw, the vertical drive device drives the screw to move downward and disengage from the grooving cutter.

[0028] S3. Conveying: The rotating device rotates clockwise, bringing a new clamping device close to the feeding conveying mechanism, and then proceeds to step S1. At the same time, the horizontal drive device that has completed step S2 is reset to the state of step S1.

[0029] S4. Second machining: When the horizontal drive device, which has completed step S2, moves to the underside of another slotting cutter, the horizontal drive device drives the screw to approach the slotting cutter again for milling.

[0030] S5. Discharge: After completing step S4, the horizontal drive device continues to move closer to the discharge conveyor until the screw is moved onto the discharge conveyor. Then the clamping device is released, allowing the screw to be conveyed away by the discharge conveyor.

[0031] The technical principle of this invention is as follows: during the first processing, the grooving cutter only completes half of the grooving. During the second processing, the grooving is done from the opposite direction, so that the burr finally appears in the middle position. The burr in the middle position is then removed by the grooving cutter that continues to work, thus ensuring that the screw is burr-free. Attached Figure Description

[0032] Figure 1 This is a top view of the screw grooving device according to an embodiment of the present invention.

[0033] Figure 2 This is a side sectional view of the screw grooving device according to an embodiment of the present invention.

[0034] Figure 3 for Figure 1 A magnified view of part A.

[0035] Figure 4 This is a schematic diagram of the feeding and conveying mechanism according to an embodiment of the present invention.

[0036] Figure 5 This is a flowchart of the grooving process of the screw grooving device according to an embodiment of the present invention.

[0037] In the above figures: 100, lifting and clamping device; 110, rotating device; 111, rotating disk; 112, rotating motor; 113, metal elastic sheet; 120, horizontal drive device; 130, vertical drive device; 140, clamping device; 200, conveying device; 201, conveyor belt mechanism; 202, gap; 203, conveying plane; 210, feeding conveying mechanism; 220, discharging conveying mechanism; 300, double-head milling device; 310, grooving milling cutter; 311, clamping head; 320, milling motor; 321, driving pulley; 322, driven pulley; 400, pneumatic system; 410, protective inner shell; 500, protective outer shell; 510, metal connecting piece; 520, opening. Detailed Implementation

[0038] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] like Figure 1-2 The screw grooving device shown includes a lifting clamping device 100, a conveying device 200, and a double-head milling device 300.

[0040] The lifting clamping device 100 includes a rotating device 110, a horizontal drive device 120 evenly distributed on the rotating device 110, a vertical drive device 130 mounted on the horizontal drive device 120, and a clamping device 140 mounted on the top of the vertical drive device 130. The rotating device 110 is used to drive the screw to make an arc-shaped transmission motion around it, while the horizontal drive device 120 and the vertical drive device 130 drive the screw to move horizontally and vertically, and the clamping device 140 is used to fix the screw.

[0041] The specific rotating device 110 includes a rotating disk 111 and a rotating motor 112 that is connected to the rotating disk 111. The horizontal driving device 120 is an electric slide rail, the vertical driving device 130 is a telescopic cylinder, and the clamping device 140 is a clamping cylinder. A pneumatic system 400 for driving the telescopic cylinder and the clamping cylinder is set at the center of the rotating disk 111. Because the cylinder has the characteristic of high speed, the use of both telescopic cylinder and clamping cylinder effectively improves the efficiency of screw lifting and clamping.

[0042] like Figure 1As shown, the conveying device 200 includes a feeding conveying mechanism 210 and a discharging conveying mechanism 220 arranged in parallel. One end of the feeding conveying mechanism 210 is located on one side of the rotating device 110, and one end of the discharging conveying mechanism 220 is located on the other side of the rotating device 110, which are used for screw entry lifting clamping device 100 and screw removal lifting clamping device 100.

[0043] like Figure 1-2 As shown, the double-head milling device 300 includes two grooving cutters 310 and a milling motor 320. The milling motor 320 is connected to a drive pulley 321, and two driven pulleys 322 are connected to both sides of the drive pulley 321 via belt drive. The driven pulleys 322 are connected to clamping heads 311, which clamp the two grooving cutters 310 respectively. The two grooving cutters 310 are located on the upper side of the rotating device 110, and are located on the feeding conveying mechanism. On the extension line of the conveying direction of feed conveyor 210 and discharge conveyor 220, when the horizontal drive device 120 is located below the slotting cutter 310, the feed direction of the horizontal drive device 120 is parallel to the conveying directions of feed conveyor 210 and discharge conveyor 220. This ensures that the horizontal drive device 120 can bring the screw into the lower side of the slotting cutter 310 for processing, and also ensures that the horizontal drive device 120 can bring the screw away from the slotting cutter 310 and into the discharge conveyor 220.

[0044] like Figure 4 As shown, both the feeding conveyor mechanism 210 and the discharging conveyor mechanism 220 include two parallel conveyor belt mechanisms 201. A gap 202 for fixing screws is provided between the two conveyor belt mechanisms 201, that is, the screw is stuck between the two conveyor belt mechanisms 201. The two conveyor belt mechanisms 201 move to one side at the same time, thereby driving the screw to move to that side.

[0045] like Figure 1-3 As shown, metal elastic sheets 113 are evenly distributed along the edge of the rotating disk 111. A protective shell 500 is provided on the outer side of the rotating disk 111. The protective shell 500 does not directly contact the rotating disk 111. A metal connecting piece 510 is provided on the protective shell 500 corresponding to the metal elastic sheet 113. The metal connecting piece 510 is electrically connected to the main power supply. The metal elastic sheet 113 is electrically connected to the horizontal drive device 120 and the pneumatic system 400. When the metal connecting piece 510 and the metal elastic sheet 113 are in close contact, power can be supplied to the pneumatic system 400 and the horizontal drive device 120.

[0046] like Figure 1-2As shown, the pneumatic system 400 is provided with a protective inner shell 410 to prevent processing waste from contacting the pneumatic system 400. The protective outer shell 500 has an opening 520 near the feeding conveyor 210 and the discharging conveyor 220 for screws to enter and exit. The protective outer shell 500 encloses the double-head milling device 300 and plays a protective role.

[0047] like Figure 2 As shown, the bottom horizontal height of the slotting cutter 310 near the feeding conveyor 210 is higher than the bottom of the other slotting cutter 310; the conveying plane 203 of the feeding conveyor 210 is higher than the conveying plane 203 of the discharging conveyor 220, meaning that machining a screw vertical drive device 130 only requires lifting and lowering on one side.

[0048] like Figure 5 The grooving process of the screw grooving device shown includes:

[0049] S1. Feeding: The feeding conveyor 210 conveys the screw to the rotating device 110, and then the vertical drive device 130 rises and the clamping device 140 clamps the screw.

[0050] S2. First processing: The horizontal drive device 120 drives the screw to approach the grooving cutter 310. When the screw contacts the rotating grooving cutter 310, milling will be performed on the screw. When the grooving cutter 310 cuts into the screw halfway, the vertical drive device 130 drives the screw to move downward and disengage from the grooving cutter 310, that is, only half of the grooving is completed.

[0051] S3, Conveying: The rotating device 110 rotates clockwise, causing a new clamping device 140 to approach the feeding conveying mechanism 210, and then proceeds to step S1. At the same time, the horizontal drive device 120, which has completed step S2, is reset to the state of step S1.

[0052] S4. Second machining: When the horizontal drive device 120, which has completed step S2, moves to the underside of another grooving cutter 310, the horizontal drive device 120 drives the screw to approach the grooving cutter 310 again for milling. Because it has rotated 180° at this time, the screw position is exactly opposite. At this time, the grooving cutter 310 will cut into the screw from the other side for milling until it coincides with the half-groove opened in step S2, and the milling is completed.

[0053] S5. Discharge: After completing step S4, the horizontal drive device 120 continues to move, passing through the half-opened slot in step S2, and approaches the discharge conveyor 220 until the screw is moved onto the discharge conveyor 220. Then the clamping device 140 is released, so that the screw is conveyed away by the discharge conveyor 220.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A grooving process for a screw grooving device, characterized in that: The screw grooving device includes: Lifting and clamping device: includes a rotating device, a horizontal drive device evenly distributed around the rotating device, a vertical drive device mounted on the horizontal drive device, and a clamping device on the top of the vertical drive device. Conveying device: includes a feeding conveyor and a discharging conveyor arranged in parallel, with one end of the feeding conveyor located on one side of the rotating device and one end of the discharging conveyor located on the other side of the rotating device; Double-head milling device: includes two grooving cutters, the two grooving cutters are located on the upper side of the rotating device, and the two grooving cutters are respectively located on the extension lines of the conveying directions of the feeding conveying mechanism and the discharging conveying mechanism; The grooving process of the screw grooving device includes: S1. Feeding: The feeding conveyor conveys the screw to the rotating device, and then the vertical drive device rises and the clamping device clamps the screw. S2, First processing: The horizontal drive device drives the screw close to the grooving cutter. When the grooving cutter cuts halfway into the screw, the vertical drive device drives the screw to move downward and disengage from the grooving cutter. S3. Conveying: The rotating device rotates clockwise, bringing a new clamping device close to the feeding conveying mechanism, and then proceeds to step S1. At the same time, the horizontal drive device that has completed step S2 is reset to the state of step S1. S4. Second machining: When the horizontal drive device, which has completed step S2, moves to the underside of another slotting cutter, the horizontal drive device drives the screw to approach the slotting cutter again for milling. S5. Discharge: After completing step S4, the horizontal drive device continues to move closer to the discharge conveyor until the screw is moved onto the discharge conveyor. Then the clamping device is released, allowing the screw to be conveyed away by the discharge conveyor.

2. The grooving process of the screw grooving device as described in claim 1, characterized in that: Both the feeding conveyor and the discharging conveyor include two parallel conveyor belts, with a gap between the two conveyor belts for fixing screws.

3. The grooving process of the screw grooving device as described in claim 1, characterized in that: The rotating device includes a rotating disk and a rotating motor that is connected to the rotating disk via a transmission.

4. The grooving process of the screw grooving device as described in claim 3, characterized in that: When the horizontal drive device is located below the slotting milling cutter, the feed direction of the horizontal drive device is parallel to the conveying direction of the feeding conveyor and the discharging conveyor.

5. The grooving process of the screw grooving device as described in claim 3, characterized in that: The horizontal drive device is an electric slide rail, the vertical drive device is a telescopic cylinder, the clamping device is a clamping cylinder, and the center of the rotating disk is provided with a pneumatic system for driving the telescopic cylinder and the clamping cylinder.

6. The grooving process of the screw grooving device as described in claim 5, characterized in that: The rotating disk is evenly distributed with metal elastic sheets on its edge. A protective shell is provided on the outer side of the rotating disk. A metal connecting piece is provided on the protective shell corresponding to the metal elastic sheet. The metal connecting piece is electrically connected to the main power supply. The metal elastic sheet is electrically connected to the horizontal drive device and the pneumatic system. The metal connecting piece is in close contact with the metal elastic sheet.

7. The grooving process of the screw grooving device as described in claim 6, characterized in that: The pneumatic system is equipped with a protective inner shell, and the protective outer shell has an opening near the feeding conveyor and the discharging conveyor, and the protective outer shell encloses the double-head milling device.

8. The grooving process of the screw grooving device as described in claim 1, characterized in that: The dual-head milling device also includes a milling motor, which is connected to a drive pulley. Two driven pulleys are driven to both sides of the drive pulley, and clamping heads are driven to the driven pulleys. The two clamping heads respectively clamp two slotting milling cutters.

9. The grooving process of the screw grooving device as described in claim 8, characterized in that: The bottom of the grooving cutter near the feeding conveyor is at a higher horizontal height than the bottom of the other grooving cutter; the conveying plane of the feeding conveyor is higher than the conveying plane of the discharging conveyor.

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