A cutting device for machining automobile parts

Abstract

The application relates to a cutting device for automobile part machining, and belongs to the technical field of automobile pipe cutting. The cutting device for automobile part machining comprises a disc saw cutting machine, a clamping assembly is arranged on the disc saw cutting machine, a supporting shaft coaxial with a pipe to be cut is arranged, rotating arms are symmetrically connected to the supporting shaft, supporting arms are fixedly connected to the rotating arms, and the supporting arms are attached to the inner wall of the pipe to be cut; when a disc saw blade of the disc saw cutting machine contacts the pipe to be cut to cut the pipe, the supporting arms are located below the cutting point and support the pipe to be cut. The supporting arms arranged in the pipe can rotate synchronously with the cutting point, the supporting arms always provide rigid support below the disc saw blade in the whole cutting process, the industry problem that the middle part of the pipe is easy to bend when the pipe is cut by hand is solved fundamentally, the material utilization rate and the modification adaptability are obviously improved, and the production cost is directly reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive tube cutting technology, and in particular to a cutting device for processing automotive parts. Background Technology

[0002] In the processing and manufacturing of automotive parts, large-diameter metal pipes such as exhaust pipes, drive shaft pipes, and subframe crossbeam pipes are widely used. After machining, these pipes often have defects such as burrs and deformation at the ends. Existing technology usually uses sawing to cut off the defective section along with a certain length of surrounding material. Since the pipe is shortened as a whole after cutting, it no longer meets the original part's dimensional requirements, and the remaining pipe section needs to be modified for use in other parts.

[0003] Currently, the commonly used sawing equipment is the handheld circular saw, which uses a clamping assembly to fix the pipe to be cut. The operator holds the machine and presses down on the circular saw blade to cut. In order to completely cut the pipe, a large force needs to be applied when pressing down. At this time, the middle part of the pipe is suspended and unsupported, which makes it very easy to bend and deform due to pressure. Once the sawing end of the pipe is bent, its effective straight section length will be further shortened, which severely limits the types of parts that can be modified from the remaining short pipe section, resulting in a great waste of effective pipe section.

[0004] In addition, the friction between the circular saw blade and the pipe during the sawing process can cause the cut portion to shift downwards, affecting the cut quality. Furthermore, the high-temperature waste chips generated during cutting can easily splash and impact the inner wall of the pipe, causing damage and affecting the modification of the effective pipe section. Summary of the Invention

[0005] Therefore, it is necessary to provide a cutting device for processing automotive parts to address the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A cutting device for processing automotive parts includes a circular saw. The circular saw is equipped with a clamping assembly, including a support shaft coaxial with the tube to be cut. A rotating arm is symmetrically rotatably connected to the support shaft, and a support arm is fixedly connected to the rotating arm. The support arm is in contact with the inner wall of the tube to be cut. When the circular saw blade of the circular saw contacts the tube to be cut and cuts it, the support arm is located below the cutting point to support the tube to be cut.

[0007] Preferably, the device further includes a drive motor, a sliding block is slidably connected to the rotating arm, a rotating screw is fixedly connected to the output shaft of the drive motor, an adjusting base is threadedly connected to the rotating screw, and the sliding blocks on both rotating arms are mounted on the adjusting base.

[0008] Preferably, a driven shaft is rotatably connected to the support arm, and a track ring is wound around the driven shaft, with the track ring in contact with the inner wall of the pipe to be cut.

[0009] Furthermore, a driven arm is mounted on the side of each of the support arms, and the driven arms on the two support arms are staggered.

[0010] Furthermore, an electric telescopic rod is fixedly connected to the circular saw, and the support shaft is fixedly connected to the telescopic end of the electric telescopic rod.

[0011] Furthermore, a guide groove is provided on the side of each of the support arms, the driven arm is slidably connected to the guide groove, the driven arm is provided with a drive tooth groove, and a drive gear is fixedly connected to one of the driven shafts, the drive gear meshing with the drive tooth groove.

[0012] Preferably, the support arm is provided with an exhaust port.

[0013] Furthermore, a movable baffle is fixedly connected to the rotating arm.

[0014] Furthermore, a cover is fixedly connected to the support shaft, and a fixed baffle is installed on the cover.

[0015] Furthermore, a connecting pin seat is fixedly connected to the rotating arm, and a clamping arm is rotatably connected to the connecting pin seat. A U-shaped spring is provided between the clamping arm and the connecting pin seat.

[0016] Compared with the prior art, the present invention provides a cutting device for processing automotive parts, which has the following advantages: The parts of the device not covered herein are the same as or can be implemented using existing technologies; 1. This invention solves the industry problem of pipe fittings being easily bent when the middle part of the pipe is suspended during hand-held downward sawing by setting a support arm inside the pipe fitting that can rotate synchronously with the sawing point, so that it is always located directly below the saw blade to provide rigid support throughout the sawing process. This allows the remaining pipe section after the defective section is removed to retain the maximum length, significantly improving material utilization and adaptability for modification, and directly reducing production costs.

[0017] 2. When the support arm of the present invention approaches the lower part of the pipe, it is driven by an electric telescopic rod to retract as a whole based on the angle detection signal, avoiding the cutting path of the saw blade and reducing the risk of the support structure being sawed. At the same time, the driven arm automatically extends as the track ring rolls through gear and tooth groove meshing, and can still press down on the part of the pipe that is about to be sawed in the retracted state, which not only ensures the continuity of the end support, but also realizes the integrated switching of support and avoidance.

[0018] 3. The exhaust holes on the support arm of this invention continuously spray airflow during sawing, directly impacting the saw blade to cool it down and blowing away the waste chips, guiding the waste chips towards the defective section, effectively preventing high-temperature debris from impacting the inner wall of the pipe and causing secondary damage. As the support arm retracts, the guide spacing changes, and the clamping arm pushes the fixed and moving baffles to swing adaptively towards the saw blade, compensating for the airflow path deviation and ensuring that the guide covers the cutting point. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is an isometric view of the present invention; Figure 5 This is a schematic diagram of the support disk structure in this invention; Figure 6 This is a schematic diagram of the structure of the casing in this invention; Figure 7 This is a schematic diagram of the structure of the fixed baffle in this invention; Figure 8 This is a schematic diagram of the structure of the moving baffle in this invention; Figure 9 For the present invention Figure 8 Enlarged view of section A in the middle; Figure 10 This is a schematic diagram of the structure of the adjusting base in this invention; Figure 11 This is a schematic diagram of the drive tooth groove in the present invention; Figure 12 This is a schematic diagram of the driven arm in this invention; Figure 13 This is a schematic diagram of the support arm in this invention; Figure 14 This is a schematic diagram of the track ring structure in this invention.

[0020] In the diagram: 1. Circular saw; 101. Clamping assembly; 102. Pipe to be cut; 2. Electric telescopic rod; 201. Support shaft; 202. Support plate; 3. Support assembly; 301. Rotating arm; 302. Sliding block; 303. Adjusting base; 304. Rotating screw; 305. Drive motor; 306. Cover; 307. Connecting pin seat; 308. Clamping arm; 309. U-shaped spring; 4. Support arm; 401. Track ring; 402. Driven shaft; 403. Drive gear; 404. Guide groove; 405. Driven arm; 406. Drive tooth groove; 407. Exhaust hole; 5. Moving stop; 501. Fixed stop. Detailed Implementation

[0021] 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.

[0022] Example: A cutting device for processing automotive parts. Tubes, such as exhaust pipes, drive shaft pipes, and subframe crossbeam pipes, are large-diameter metal tubes used in automotive parts. After manufacturing, defects are easily present at the ends of these tubes. Existing technologies often use sawing to remove these defective sections. However, removing the defective section requires cutting away a certain length of material, including the defective part, altering the overall length and shortening the tube, thus no longer meeting the original part's dimensional requirements. Therefore, the remaining tube section needs to be repurposed, such as being modified for other parts. Current sawing methods often employ methods such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 The handheld circular saw 1 is equipped with a clamping assembly 101 to clamp the pipe 102 to be cut in order to ensure the stability of the pipe 102. When cutting through the circular saw blade of the circular saw 1, in order to cut the pipe better, the hand needs to press down the saw blade. At this time, since there is no support in the middle of the pipe, the pipe is easily bent, which affects the quality of the intact pipe after cutting. Once the saw end of the pipe is bent, its effective straight section length will be further shortened, which further limits the parts that can be modified from the remaining short pipe section, resulting in a waste of effective pipe section.

[0023] Therefore, refer to Figure 4 , Figure 6 and Figure 13 The device includes a support shaft 201 coaxial with the pipe 102 to be cut. A support assembly 3 is mounted on the support shaft 201. The support assembly 3 includes a rotating arm 301 symmetrically rotatably connected to the support shaft 201. A support arm 4 is fixedly connected to the rotating arm 301. The support arm 4 is in contact with the inner wall of the pipe 102 to be cut. When the circular saw blade of the circular sawing machine 1 contacts the pipe 102 to be cut, the support arm 4 is located directly below the cutting point to support the pipe 102 to be cut and prevent the pipe 102 to be cut from collapsing under pressure during the sawing process.

[0024] In one specific embodiment, since the support arm 4 needs to support the pipe 102 to be cut, the friction between the support arm 4 and the inner wall of the pipe 102 to be cut is large. In order to facilitate the rotation of the support arm 4 with the rotating arm 301, refer to... Figure 13 and Figure 14A driven shaft 402 is rotatably connected to the support arm 4. A track ring 401 is wound around the driven shaft 402. The track ring 401 is in contact with the inner wall of the pipe to be cut 102, so that when the support arm 4 rotates, the friction between the support arm 4 and the pipe to be cut 102 is converted into the rolling of the track ring 401. That is, when the support arm 4 rotates with the rotating arm 301, the track ring 401 can roll gradually under the action of the driven shaft 402.

[0025] In one specific embodiment, in order to ensure that the two rotating arms 301 rotate synchronously, refer to Figure 6 and Figure 10 It also includes a drive motor 305, a sliding block 302 slidably connected to the rotating arm 301, a rotating lead screw 304 fixedly connected to the output shaft of the drive motor 305, an adjusting base 303 threadedly connected to the rotating lead screw 304, and the sliding blocks 302 on both rotating arms 301 are mounted on the adjusting base 303; wherein, reference Figure 10 The rotating arm 301 is L-shaped, with the open end of the L-shape located on the side of the rotating arm 301 away from the support shaft 201, which facilitates the adjustment of the base 303's up-and-down movement on the rotating screw 304.

[0026] During the downward movement of the adjusting base 303, the two rotating arms 301 initially have a certain angle between them, which allows them to move away from each other and increases the angle between them. When the two rotating arms 301 rotate to the horizontal position, the axis of the adjusting base 303 and the support shaft 201 are at the same height. As the adjusting base 303 continues to move downward, the two rotating arms 301 move closer to each other and the angle between them decreases, thus achieving synchronous rotation and downward movement of the two rotating arms 301.

[0027] It should be noted that the drive motor 305 is controlled by the control system. An angle detection component is set on the circular saw 1. When the circular saw 1 moves down to cut, the angle detection component is used to detect the angle of the downward tilt of the circular saw blade and synchronize the position information to the control system. The control system determines the relative position of the circular saw blade and the pipe 102 to be cut based on the position information, and controls the drive motor 305 to adjust the rotation angle of the rotating arm 301 so that the support arm 4 is located below the circular saw blade. Under the condition of having support force, the circular saw blade is prevented from cutting the support arm 4.

[0028] Among them, reference Figure 8 and Figure 9 A cover 306 is fixedly connected to the support shaft 201, and a drive motor 305 is installed inside the cover 306.

[0029] In one specific implementation, refer to Figure 12A driven boom 405 is installed on the side of a single support boom 4, as shown in the reference. Figure 6 The driven arms 405 on the two support arms 4 are staggered, that is, the two driven arms 405 are located on both sides of the support arm 4. Figure 6 In the middle, the left support arm 4 and the lower right driven arm 405 are a group, and the right support arm 4 and the upper left driven arm 405 are a group. When the two support arms 4 move away from each other as the circular saw blade cuts, a cavity is formed between the two support arms 4. Similarly, the two driven arms 405 are located on both sides of the cavity to support the two sides of the cut seam of the cut part, preventing the circular saw blade from driving the cut part of the pipe to move down under the action of friction.

[0030] In one specific embodiment, when the support arm 4 moves below the support shaft 201 and the circular saw 1 cuts to the lower end of the pipe to be cut 102, in order to prevent the circular saw blade from cutting the support arm 4, the support arm 4 needs to be retracted a certain distance into the intact pipe. Retraction refers to... Figure 4 At that time, support shaft 201 moves to the lower right. For details, refer to... Figure 4 , Figure 5 and Figure 6 An electric telescopic rod 2 is fixedly connected to the circular saw 1. The electric telescopic rod 2 is controlled and driven by the control system according to the cutting position of the circular saw blade. The support shaft 201 is fixedly connected to the telescopic end of the electric telescopic rod 2. When the angle detection component detects that the support arm 4 needs to be moved, the electric telescopic rod 2 drives the support arm 4 to retract.

[0031] In order to prevent the added driven arm 405 from being cut by the circular saw blade, and to prevent the outer driven arm 405 from being blocked by the circular saw blade, refer to Figure 12 , Figure 13 and Figure 14 A guide groove 404 is provided on the side of a single support arm 4, and a driven arm 405 is slidably connected to the guide groove 404. A drive tooth groove 406 is provided on the driven arm 405, and a drive gear 403 is fixedly connected to one of the driven shafts 402. The drive gear 403 meshes with the drive tooth groove 406.

[0032] That is, during the movement of the track ring 401, the driven shaft 402 is driven to rotate synchronously, which in turn drives the drive gear 403 to rotate. As the support arm 4 rotates, the driven arm 405 rotates accordingly. When the support arm 4 rotates to the lower end of the pipe to be cut 102, the driven arm 405... Figure 6 The state is moved to Figure 7 The state.

[0033] exist Figure 6 and Figure 7In this state, the single driven arm 405 is slidably connected to the two support arms 4 via the guide groove 404, resulting in more stable support for the pipe fitting; Figure 7 In the middle, the retracted driven arm 405 is used to press down the pipe fitting 102 that is about to be sawn.

[0034] It should be noted that the driven arm 405 on the support arm 4, which rotates in the same direction as the circular saw blade, is located outside the pipe 102 to be cut. When the cutting reaches below the pipe 102 and the support arm 4 retracts, the pipe end that the circular saw blade contacts first has no internal support. At this time, the driven arm 405 acts as a support structure to support this part of the pipe.

[0035] The diameter of the driven shaft 402 is larger than the diameter of the drive gear 403 to ensure the travel of the driven arm 405.

[0036] In one specific implementation, refer to Figure 6 , Figure 12 and Figure 13 An exhaust port 407 is provided on the support arm 4. Figure 6 When the support arm 4 moves to form a cavity, the gas ejected from the exhaust hole 407 is used to impact the circular saw blade, cool the circular saw blade, and blow away the waste chips generated by cutting, so as to counteract the force of its movement towards the pipe 102 to be cut, so that the waste chips will not impact the inner wall of the pipe 102 to be cut, thereby preventing damage to the inner wall of the pipe 102 to be cut.

[0037] Among them, reference Figure 6 and Figure 11 A movable baffle 5 is fixedly connected to the rotating arm 301. The movable baffle 5 extends at an angle away from the support shaft 201, and the generated waste chips move away from the support shaft 201 under the action of the movable baffle 5.

[0038] At the same time, the exhaust port 407 and the moving baffle 5 rotate with the rotation of the rotating arm 301, which can maintain a relative distance from the cutting point, ensuring the blowing and guiding effect of the waste chips, so that the waste chips can be discharged.

[0039] Reference Figure 7 When the moving baffle 5 moves to the bottom of the pipe to be cut 102 and the support arm 4 retracts, a new cavity is gradually formed between the two support arms 4. At this time, the support arm 4 exhausts air towards the exhaust hole 407 of the cavity. The air discharged from the two support arms 4 convects and impacts, and the gas impact force converges and moves upward, resulting in greater pressure. At this time, the airflow blows onto the moving baffle 5 and moves towards the circular saw blade under the guidance. At this time, the airflow can directly blow the waste chips and other debris towards the defective end.

[0040] The airflow is discharged from a specific end of the support arm 4, which is controlled by the control system according to the sawing position.

[0041] In one specific implementation, refer to Figure 7 When the two support arms 4 are close to each other below the pipe 102 to be cut, there is a gap between the two moving baffles 5. Waste chips can easily enter the intact section of the pipe 102 to be cut through this gap. Therefore, a fixed baffle 501 is installed on the cover 306.

[0042] In one specific embodiment, as the support arm 4 retracts, the distance between the moving baffle 5 and the circular saw blade increases. To better guide the gas flow towards the circular saw blade, refer to... Figure 8 and Figure 9 A connecting pin seat 307 is fixedly connected to the rotating arm 301, and a clamping arm 308 is rotatably connected to the connecting pin seat 307. A U-shaped spring sheet 309 is provided between the clamping arm 308 and the connecting pin seat 307. When the rotating arm 301 rotates to the bottom of the pipe to be cut 102, the clamping arm 308 contacts the cover 306 and is squeezed and slides, so that the clamping arm 308 squeezes the fixed stop blade 501 and the moving stop blade 5, so that the fixed stop blade 501 and the moving stop blade 5 move towards the circular saw blade, and the flow is guided more accurately.

[0043] U-shaped spring 309 is used to drive the clamping arm 308 to reset when the rotating arm 301 is reset upward.

[0044] In one specific implementation, refer to Figure 5 A support disk 202 is fixedly connected to the support shaft 201 to provide support inside the pipe 102 to be cut. At the same time, the support disk 202 can also stabilize the lever arm of the support shaft 201 to ensure the support effect of the support assembly 3.

[0045] In a specific workflow, the pipe fitting 102 to be cut is sleeved on the support shaft 201 and the support plate 202, and fixed by the clamping assembly 101.

[0046] The circular saw 1 is started to perform downward sawing. The angle detection component captures the angle and position information of the saw blade in real time and feeds it back to the control system. The control system drives the drive motor 305 to rotate forward. Through the threaded engagement of the rotating screw 304 and the adjusting base 303, the two rotating arms 301 are driven to rotate synchronously, so that the support arm 4 always follows the sawing point and provides real-time support force to prevent the pipe from collapsing or bending under the sawing pressure.

[0047] During the rotation of the support arm 4, the track ring 401 contacts the inner wall of the pipe and rolls, converting the original sliding friction into rolling friction, which significantly reduces the resistance to the movement of the support arm 4. At the same time, as the two support arms 4 move away from each other, the driven arm 405 provides auxiliary support to both sides of the cutting seam, preventing the cut part of the pipe from moving downward under the friction of the saw blade.

[0048] When the sawing approaches the lower part of the pipe, the control system controls the electric telescopic rod 2 to retract based on the angle detection signal, driving the support shaft 201 and the entire support assembly 3 to retract towards the intact pipe section, preventing the circular saw blade from touching the support arm 4. The rolling of the track ring 401 synchronously drives the drive gear 403 to rotate, causing the driven arm 405 to unfold in the opposite direction, pressing down on the part of the pipe to be sawed, ensuring that the end of the pipe to be cut 102 does not lose support after the retraction process.

[0049] Throughout the sawing process, the exhaust port 407 continuously sprays airflow into the saw blade to cool it down and disperse the cutting debris. The moving baffle 5 rotates synchronously with the rotating arm 301, guiding the debris away from the defective section away from the support shaft 201. When the support arm 4 retracts to below the pipe, the exhaust ports 407 on the two support arms 4 form a convective impact. After being guided by the moving baffle 5 and the fixed baffle 501, the airflow is concentrated and blown towards the saw blade and the cutting area, preventing the debris from entering the inner wall of the intact pipe section in reverse.

[0050] When the support arm 4 retracts, causing the distance between the moving stop blade 5 and the saw blade to increase, the clamping arm 308 contacts the cover 306 and is squeezed and slids, pushing the fixed stop blade 501 and the moving stop blade 5 to swing towards the saw blade, compensating for the airflow deviation caused by the change in distance, and ensuring that the airflow always accurately covers the saw blade and the cutting point.

[0051] After the pipe 102 is completely cut off and the defective section falls off, the circular saw 1 is raised and reset. The control system controls the drive motor 305 to reverse. By adjusting the base 303, the rotating arm 301 is driven to retract to the initial angle. The electric telescopic rod 2 extends and resets. The support shaft 201 exits the pipe, completing the complete workflow of a single cut and preparing to enter the next processing cycle.

Claims

1. A cutting device for processing automotive parts, comprising a circular saw (1), wherein the circular saw (1) is provided with a clamping assembly (101), characterized in that, Includes a support shaft (201) coaxial with the pipe fitting (102) to be cut, a rotating arm (301) symmetrically rotatably connected to the support shaft (201), a support arm (4) fixedly connected to the rotating arm (301), and the support arm (4) being in contact with the inner wall of the pipe fitting (102) to be cut; When the circular saw blade of the circular sawing machine (1) contacts the pipe to be cut (102) for sawing, the support arm (4) is located below the sawing point and supports the pipe to be cut (102).

2. The cutting device for processing automotive parts according to claim 1, characterized in that, It also includes a drive motor (305), a sliding block (302) is slidably connected to the rotating arm (301), a rotating screw (304) is fixedly connected to the output shaft of the drive motor (305), an adjusting base (303) is threadedly connected to the rotating screw (304), and the sliding blocks (302) on both rotating arms (301) are mounted on the adjusting base (303).

3. The cutting device for processing automotive parts according to claim 1, characterized in that, A driven shaft (402) is rotatably connected to the support arm (4), and a track ring (401) is wound around the driven shaft (402). The track ring (401) is in contact with the inner wall of the pipe (102) to be cut.

4. A cutting device for processing automotive parts according to claim 3, characterized in that, A driven arm (405) is mounted on the side of a single support arm (4), and the driven arms (405) on two support arms (4) are staggered.

5. A cutting device for processing automotive parts according to claim 4, characterized in that, An electric telescopic rod (2) is fixedly connected to the disc saw (1), and the support shaft (201) is fixedly connected to the telescopic end of the electric telescopic rod (2).

6. A cutting device for processing automotive parts according to claim 5, characterized in that, A guide groove (404) is provided on the side of a single support arm (4), and the driven arm (405) is slidably connected to the guide groove (404). The driven arm (405) is provided with a drive tooth groove (406), and a drive gear (403) is fixedly connected to one of the driven shafts (402). The drive gear (403) meshes with the drive tooth groove (406).

7. A cutting device for processing automotive parts according to claim 2, characterized in that, The support arm (4) is provided with an exhaust hole (407).

8. A cutting device for machining automotive parts according to claim 7, characterized in that, A movable baffle (5) is fixedly connected to the rotating arm (301).

9. A cutting device for machining automotive parts according to claim 8, characterized in that, A cover (306) is fixedly connected to the support shaft (201), and a fixed baffle (501) is installed on the cover (306).

10. A cutting device for processing automotive parts according to claim 9, characterized in that, A connecting pin seat (307) is fixedly connected to the rotating arm (301), and a clamping arm (308) is rotatably connected to the connecting pin seat (307). A U-shaped spring sheet (309) is provided between the clamping arm (308) and the connecting pin seat (307).

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