Cutting mechanism of numerical control spring coiling machine

Abstract

The utility model provides a numerical control spring coiling machine cut-off mechanism which comprises a cut-off mechanism body controlled by a numerical control system, the cut-off mechanism body comprises an X-direction driving mechanism, a Z-direction driving mechanism, a connecting rod and a laser cutting head, the X-direction driving mechanism drives the Z-direction driving mechanism to move in the X direction, and the Z-direction driving mechanism comprises a connecting table moving in the Z direction. A pair of connecting rods with the same length are arranged in parallel, the two ends of the connecting rods are rotatably fixed to the connecting table and the laser cutting head respectively to form a parallelogram mechanism, the connecting table is provided with a limiting table, and the limiting table is supported on the lower side faces of the connecting rods. And the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control spring coiling machines, in particular to a cutting mechanism of a numerical control spring coiling machine. Background Art

[0002] Springs, as essential components in industrial production, are widely used in the automotive, shipbuilding, aerospace, and other fields. With the development of industry, the demand for springs with high precision, high strength, and good stability is becoming increasingly urgent, and the demand is also increasing. This places higher demands on the performance and efficiency of spring coiling machines, especially their cutting method and cutting efficiency.

[0003] After the spring "winding" process is completed, the spring must be cut off from the last coil of the spring body. The existing CNC spring winding machines use straight cutting, swing cutting, bisection cutting or twisting cutting methods for cutting springs, all of which are mechanical cutting. Mechanical cutting has a large extrusion stress on the cutting edge of the tool, and the tool is prone to frequent damage and replacement after long-term use. Especially for oil-quenched spring steel wire and high-strength spring steel wire, the mechanical cutting mechanism requires a large force to cut the spring, and the mechanical cutting mechanism is easily damaged after long-term operation, and its trouble-free operation time is short. Frequent replacement of tools and cutting mechanisms brings about the problems of high overall cost and low production efficiency. Mechanical cutting also has problems such as deformation of the spring end to produce the "hook head" phenomenon, and deformation of the first coil of the spring, which affects the forming accuracy and batch stability of the spring. The above problems have become bottlenecks restricting the processing of the spring manufacturing industry and need to be solved urgently.

[0004] It is necessary to develop a cutting mechanism for a CNC spring coiling machine to solve the above problems. Utility Model Content

[0005] In view of the defects in the prior art, the utility model aims to provide a cutting mechanism for a CNC spring coiling machine.

[0006] The technical solution to this utility model is as follows: After the spring winding process is completed, the spring coiling machine's CNC system activates the cutting mechanism. The CNC system drives the laser cutting head to focus on the spring wire to be cut, triggering the laser to operate. Simultaneously, the cutting mechanism drives the laser cutting head to complete the planar cutting of the spring end face or the cross-section cutting of the spring wire. This is particularly applicable to springs of different diameters.

[0007] The cutting mechanism of the CNC spring coiling machine is used to cut the coiled springs formed by the spring coiling machine. It includes a CNC system that controls the operation of the cutting mechanism. The cutting mechanism includes an X-axis drive mechanism, a Z-axis drive mechanism, a connecting rod, and a laser cutting head. The X-axis drive mechanism is fixedly mounted on the spring coiling machine. The X-axis drive mechanism includes a slider that moves in the X direction. The Z-axis drive mechanism is fixedly connected to the slider. The Z-axis drive mechanism includes a connecting platform that moves in the Z direction. A pair of connecting rods of equal length are arranged parallel to each other, with their ends rotatably mounted on the mounting surfaces of the connecting platform and the laser cutting head. A limit platform is provided on the connecting platform. The limit platform is supported on the lower side of the connecting rod by the weight of the laser cutting head. It restricts the downward movement of the laser cutting head. To avoid interference, the limit platform is an inclined surface supported on the lower side of the connecting rod.

[0008] To control the accuracy, both the X-direction drive mechanism and the Z-direction drive mechanism use servo motors connected to ball screw pairs through couplings. The screw pair of the X-direction drive mechanism drives the slider to move in the X direction, and the screw pair of the Z-direction drive mechanism drives the connecting table to move in the Z direction.

[0009] In order to achieve cross-section cutting, a stopper is fixedly provided below the Z-direction drive mechanism, and a guide block is provided below the connecting rod on the laser cutting head, which is parallel to the stopper and extends relatively along the Y-direction, thereby realizing L-shaped movement of the laser cutting head, simplifying the mechanical structure and control, and being able to realize two cutting methods at the same time.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The laser cutting mechanism is simple. The Z-axis drive mechanism is connected to the laser head through a connecting rod to realize the L-shaped movement of the laser cutting head, which simplifies the mechanical structure and control.

[0012] 2. It can realize two cutting methods of springs: plane cutting of spring end surface and cutting of spring steel wire. The incision is smooth and the outer diameter of the spring changes little after cutting. There is no mechanical deformation during cutting. It has high precision and good stability, which reduces the spring grinding equipment and process.

[0013] 3. The laser cutting method is simple. The laser cutting mechanism can be started after the spring is wound. There is no need to wait, and the cutting efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a CNC laser cutting spring coiling machine;

[0015] Figure 2 This is the main view of the laser cutting mechanism;

[0016] Figure 3 This is the left view of the laser cutting mechanism;

[0017] Figure 4This is an enlarged diagram of the two spring schematics;

[0018] Figure 5 Schematic diagram of the X-axis driving mechanism;

[0019] Figure 6 Schematic diagram of the Z-axis drive mechanism.

[0020] The figure shows:

[0021] 1. Spring wire; 2. Feeding mechanism; 3. Wire feeding trough plate; 4. Pitch knife; 5. Cutting mechanism; 6. Reducing mechanism; 7. Spring; 51. X-axis drive mechanism; 52. Z-axis drive mechanism; 53. Connecting rod; 54. Laser cutting head; 55. Stop block; 56. Guide block; 511 / 521. Servo motor; 512 / 522. Coupling; 513 / 523. Ball screw pair; 514. Slider; 524. Connecting table; 525. Limiting table; 71. End face smoothing spring; 711. End face; 72. Spring cross section cutting spring; 721. Cross section. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that those skilled in the art may make various changes and improvements without departing from the scope of the present invention, and these modifications are all within the scope of protection of the present invention.

[0023] For ease of understanding and description of the present invention, the feeding direction is referred to as the X direction, the spring extension direction is referred to as the Y direction, and the direction perpendicular to the X direction and the Y direction is referred to as the Z direction.

[0024] like Figures 1 to 6 As shown, the spring coiling machine includes a feed mechanism 2, a diameter reducing mechanism 6, a cutting mechanism 5, and a numerical control system. Spring wire 1 is fed in the X direction via rollers on the feed mechanism 2 and then reaches the diameter reducing mechanism 6 via the wire trough 3 at the end of the feed mechanism. Under the resistance of the diameter reducing mechanism 6, the spring wire undergoes plastic deformation, forming a circular spring coil. The feed mechanism 2 continuously feeds the wire, and the diameter reducing mechanism 6 and the pitch cutter 4 work together to coil a spring 7, extending perpendicular to the feed direction. At the last coil of the spring, the numerical control system activates the cutting mechanism 5 to cut it, forming a complete spring 7. The numerical control system controls each system to produce the next spring.

[0025] This embodiment provides a CNC spring coiling machine cutting mechanism for cutting the spring 7 to form a spring 71 with a flat end surface. The entire surface of the spring end surface 711 is perpendicular to the extension direction of the spring, that is, the end surface 711 of the spring 7 is parallel to the XZ plane.

[0026] The cutting mechanism 5 includes an X-drive mechanism 51, a Z-drive mechanism 52, a connecting rod 53, and a laser cutting head 54. The X-drive mechanism 51 includes a servo motor 511, a coupling 512, a ball screw 513, and a slider 514, which are fixed to the spring coiling machine. The servo motor 511 is fixedly mounted on the spring coiling machine. The ball screw 513 is connected to the servo motor 511 via the coupling 512. The ball screw 513 can drive the slider to move back and forth in the X direction. The Z-drive mechanism 52 is perpendicular to the X-drive mechanism 51 and fixed to the slider 514. The slider 514 of the X-drive mechanism 51 drives the Z-drive mechanism to move back and forth in the X direction. The Z-drive mechanism 52 includes a servo motor 521, a coupling 522, a ball screw 523, and a connecting platform 524. A servo motor 521 is fixedly mounted on the slider 514. A ball screw assembly 523 is connected to the servo motor 521 via a coupling 522. The ball screw assembly 523 drives the connecting platform 524 to move back and forth in the Z-axis. The laser cutting head 54 is positioned parallel to the Z-axis drive mechanism 52. Both the connecting platform 524 and the laser cutting head 54 are mounted on surfaces with YZ planes. A pair of connecting rods 53 of equal length are rotatably mounted at their ends on the YZ mounting surfaces of the laser cutting head 54 and the connecting platform 524, respectively. The two connecting rods are arranged parallel to each other, forming a parallelogram structure with the laser cutting head and the connecting platform. This allows the laser cutting head to rotate about the X-axis relative to the connecting platform. A limit stop 525 is provided on the connecting platform 524. The limit stop 525 is located on the underside of one or both connecting rods. Gravity forces the laser cutting head to support the limit stop on the underside of the connecting rods. To prevent interference, the limit platform 525 is an inclined surface, which is the surface of the XY plane rotating downward along the X-axis. When the connecting rod 53 rotates to the low position under the action of gravity, the limit platform inclined surface supports the lower side of the connecting rod, limiting the connecting rod from continuing to rotate downward.

[0027] In this embodiment, the method for cutting the end face 711 of the spring 71 with a flat end face is as follows: When the spring steel wire 1 is transported in the X direction by the roller on the feeding mechanism 2, it reaches the diameter-changing mechanism 6 through the wire feeding slot plate 3 at the end of the feeding mechanism. Under the resistance of the diameter-changing mechanism 6, the spring steel wire undergoes plastic deformation to form the spring coil. The feeding mechanism 2 feeds continuously, and a spring 7 is wound out under the coordinated action of the diameter-changing mechanism 6 and the pitch knife 4. When the spring is wound for the last turn, the cutting mechanism 5 is started by the numerical control system. The cutting mechanism 5 first causes the X-direction drive mechanism 51 to drive the Z-direction drive mechanism 52 to the outside of the specified position of the spring. Specifically, the servo motor 511 rotates the ball screw pair 513 through the coupling 512, so that the Z-direction drive mechanism 52 moves along the X direction to the outside of the specified position of the spring under the guidance of the slider 514, that is, Figure 3The spring winding starting point is shown. Next, the Z-drive mechanism 52 drives the laser cutting head 54 downward to the surface of the spring wire to be cut and focuses the laser. Specifically, the servo motor 521 rotates the ball screw assembly 523 via the coupling 522, driving the connecting platform 524 in the Z direction. This, in turn, drives the laser cutting head 54 in the Z direction via the connecting rod 53 to the surface of the spring wire to be cut and focus the laser. Finally, the laser is activated for laser cutting. During the cutting process, the CNC system controls the X-drive mechanism 51 and the Z-drive mechanism 52 to work together, causing the laser cutting head 54 to interpolate in the X and Z directions, ensuring that the laser cutting head 54 remains focused on the spring wire surface until the entire end face 711 of the flattened spring 71 is cut. During this cutting process, the weight of the laser cutting head 54 causes the lower side of the connecting rod 53 to rest against the limiter 525. After cutting, the laser is turned off, the laser cutting mechanism resets, and processing of the next spring begins. The cutting process uses oxygen, nitrogen, or high-pressure air as a high-pressure cooling medium, and a cartridge dust collector can promptly collect waste generated by laser cutting. The above process can adjust the diameter of the spring by adjusting the diameter reducing mechanism 6 as needed, and the program can be adjusted to complete the end face cutting of springs with different diameters.

[0028] The second embodiment provides a cutting mechanism of a CNC spring coiling machine for cutting a spring 7 to form a spring cross section cut spring 72 , wherein the spring cross section 721 is a vertical cross section of the spring.

[0029] This embodiment shares the same structure as the first embodiment, including the X-drive mechanism 51, Z-drive mechanism 52, connecting rod 53, and laser cutting head. The embodiment also includes a stopper 55 and a guide block 56. The stopper 55 is positioned horizontally below the Z-drive mechanism 52, with one end secured to the housing of the Z-drive mechanism 52. The guide block 56 is fixedly mounted on the laser cutting head, located below the connecting rod, parallel to the stopper 55, and extending relative to it in the Y direction. This ensures smooth and controllable motion of the laser cutting head 54 during rotation of the connecting rod 53. The stopper 55 has a guide groove on the surface opposite the guide block 56. The width of the guide groove in the X direction matches that of the guide block 56, limiting X-direction movement of the guide block. When the Z-drive mechanism 52 moves downward, causing the guide block 56 to enter the guide groove, the Z-drive mechanism 52 continues its downward movement, causing the stopper 55 to slide along the guide groove in the Y direction, driving the laser cutting head in the Y direction. Only the Z-drive mechanism moves, achieving L-shaped motion of the laser cutting head.

[0030] The specific cutting method is as follows: Using the same coiled spring as in the first embodiment, the CNC system controls the activation of the laser cutting mechanism 5 when the spring is wound for the last turn. The cutting mechanism 5 first causes the X-direction drive mechanism 51 to drive the Z-direction drive mechanism 52 to the outside of the spring's designated position. Specifically, the servo motor 511 rotates the ball screw pair 513 through the coupling 512, causing the Z-direction drive mechanism 52 to move along the X-direction to above the spring's designated position under the guidance of the slider 514. Next, the Z-direction drive mechanism 52 drives the laser cutting head 54 to move downward in the Z-direction. When the guide block 56 fixed to the laser cutting head 54 contacts the stop block 55 fixed to the Z-direction drive mechanism 52, the stop block 56 is engaged with the guide groove on both sides. At this time, the laser output from the laser cutting head has been adjusted in advance to focus on the steel wire to be cut. Finally, the laser is started, and the Z-direction drive mechanism 52 continues to operate, causing the connecting platform 524 to move downward in the Z direction. The laser cutting head 54 stops moving in the Z direction because the guide block 56 is restricted by the stop block 55. The guide block 56 begins to slide in the Y direction along the guide groove on the guide block 56. The connecting rod 53 rotates, driving the laser cutting head in the Y direction until the spring wire cross section is cut. After cutting, the laser is turned off and the laser cutting mechanism is reset to start processing the next spring.

[0031] The cutting process uses oxygen, nitrogen, or high-pressure air as a high-pressure cooling medium, and a cartridge dust collector can promptly collect waste generated by laser cutting. The above process can adjust the diameter of the spring by adjusting the diameter reducing mechanism 6 as needed, and the program can be adjusted to complete the cutting of spring sections with different diameters.

Claims

1. A cutting mechanism for a CNC spring coiling machine, used for cutting a coil spring formed by the spring coiling machine, comprising a CNC system for controlling the operation of the cutting mechanism, characterized in that: The cutting mechanism includes an X-direction drive mechanism, a Z-direction drive mechanism, a connecting rod and a laser cutting head. The X-direction drive mechanism is fixedly installed on the spring winding machine. The X-direction drive mechanism includes a slider that moves along the X-direction. The Z-direction drive mechanism is fixedly connected to the slider. The Z-direction drive mechanism includes a connecting table that moves along the Z-direction. A pair of connecting rods of equal length are arranged parallel to each other, and the two ends are rotatably mounted on the mounting surfaces of the connecting table and the laser cutting head to form a parallelogram mechanism. A limit table is provided on the connecting table, and the limit table is supported on the lower side of the connecting rod.

2. The cutting mechanism of the CNC spring coiling machine according to claim 1, characterized in that: The limiting platform is an inclined surface.

3. The cutting mechanism of the CNC spring coiling machine according to claim 2, characterized in that: The X-direction drive mechanism includes a servo motor, a coupling and a ball screw pair. The servo motor is connected to the ball screw pair through a coupling. The ball screw pair drives the slider to move back and forth along the X direction. The Z-direction drive mechanism includes a servo motor, a coupling and a ball screw pair. The servo motor is connected to the ball screw pair through a coupling. The ball screw pair drives the connecting platform to move along the Z direction.

4. The cutting mechanism of the CNC spring coiling machine according to claim 3, characterized in that: It also includes a stop block and a guide block. The stop block is horizontally arranged below the Z-direction drive mechanism and one end is fixed to the housing of the Z-direction drive mechanism. The guide block is fixedly installed on the laser cutting head and is located below the connecting rod. The stop block and the guide block are parallel to each other and extend relative to each other along the Y direction.

5. The cutting mechanism of the CNC spring coiling machine according to claim 4, characterized in that: A guide groove is provided on a side surface of the stop block opposite to the guide block, and the width of the guide groove in the X direction matches the width of the guide block in the X direction.

6. The cutting mechanism of the CNC spring coiling machine according to claim 5, characterized in that: It also includes a feeding mechanism for conveying the spring steel wire along the conveying direction, a diameter-reducing mechanism located at the end of the feeding mechanism for winding the spring steel wire into a spiral spring coil, and a cutting mechanism for cutting the spring coil to form a coiled spring. The numerical control system controls the operation of the feeding mechanism, the diameter-reducing mechanism and the cutting mechanism.

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