A split lower tool rest for a laser welding machine and its processing method

Abstract

The present invention relates to a split lower tool holder of a laser welding machine and a processing method thereof. The split lower tool holder of the laser welding machine includes: an upper part, a lower part and a connecting member. The lower surface of the upper part includes an upper plane in the middle and two upper inclined planes on both sides of the upper plane. The upper surface of the lower part includes a lower plane in the middle and two lower inclined planes on both sides of the lower plane. The connecting member is detachably connected to the upper part and the lower part for fixing the upper part and the lower part in a connected state. When the upper part and the lower part are in the connected state, the two upper inclined planes and the two lower inclined planes are correspondingly attached, and a yielding gap is formed between the upper plane and the lower plane. Compared with the prior art, the split lower tool holder of the laser welding machine provided by the present invention adopts a split structure, and utilizes the yielding gap formed between the upper part and the lower part to cancel the downward shearing force and the lateral force, weakening the outward bending effect of the lateral force on the upper part and prolonging the service life of the lower tool holder.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding machines, and particularly to a split lower tool holder of a laser welding machine and a processing method thereof. Background Art

[0002] The lower tool holder is a part of the lower shear of the double-edge shear device in the laser welding machine. The function of the double-edge shear device is to shear the tail of the previous coil of strip steel and the head of the next coil of strip steel on the unit together, ensuring the quality and straightness of the shearing cross-section of the strip head and tail, and thus preparing for subsequent strip steel seam welding and laser welding. Therefore, the use effect of the lower tool holder directly affects the shearing accuracy of the double-edge shear device in the laser welding machine.

[0003] Currently, the commonly used traditional double-edge shear device is as Figure 1 shown, which consists of an upper shear and a lower shear. The upper shear includes an upper tool holder 1A and two upper blades 2A, and the lower shear includes a lower tool holder 3A and two lower blades 4A. The upper tool holder 1A is driven downward by an external actuator, so that the two outer cutting edges of the upper blade 2A and the two inner cutting edges of the lower blade 4A are engaged with each other to achieve the purpose of simultaneously shearing the tail 5A of the previous coil of strip steel and the head 6A of the next coil of strip steel.

[0004] The force analysis of the existing lower tool holder 3A when shearing strip steel is as Figure 2 shown. The lower blade 4A will simultaneously receive a downward shearing force F1 and a lateral force F2 towards the outside, and transmit F1 and F2 to the lower tool holder 3A. Each time the strip steel is sheared, the lower tool holder will receive a shearing impact on one side. The lateral force F2 will cause the two sides of the lower tool holder 3A to gradually bend outward. After shearing a certain number of times, it is necessary to maintain the lower tool holder 3A, such as restoring its shearing accuracy by replacing the lower blade 4A, gaskets, etc. However, this method only treats the symptoms but not the root cause. As the bending degree of the lower tool holder 3A gradually increases, it is necessary to disassemble the lower tool holder 3A, re-use the machine tool processing reference surface and the blade installation surface, and then install it on the welding machine for fine adjustment to restore the initial installation accuracy of the lower tool holder. This process is not only cumbersome and extremely difficult technically, but also consumes a large amount of man-hours. Summary of the Invention

[0005] In view of this, it is necessary to provide a split lower tool holder of a laser welding machine and a processing method thereof to solve the technical problem that the lower tool holder of the welding machine in the prior art is impacted by the lateral force when shearing strip steel, bends to both sides, and consumes the service life of the lower tool holder.

[0006] The present invention provides a split lower tool holder for a laser welding machine and a processing method thereof. The split lower tool holder for the laser welding machine includes: an upper part, a lower part, and a connecting member. The lower surface of the upper part includes an upper plane in the middle and two upper inclined planes on both sides of the upper plane. The upper surface of the lower part includes a lower plane in the middle and two lower inclined planes on both sides of the lower plane. The connecting member is detachably connected to the upper part and the lower part for fixing the upper part and the lower part in a connected state. When the upper part and the lower part are in the connected state, the two upper inclined planes and the two lower inclined planes are correspondingly attached, and a clearance is formed between the upper plane and the lower plane.

[0007] Further, a plurality of first counterbores penetrating the upper part are formed in the upper part, and a plurality of threaded holes are formed in the lower part. When the upper part and the lower part are in the connected state, the first counterbores and the threaded holes are correspondingly communicated one by one, and the connecting member connects the upper part and the lower part through the first counterbores and the threaded holes.

[0008] Further, a plurality of second counterbores penetrating the upper part are formed in the upper part, and a plurality of through holes penetrating the lower part are formed in the lower part. When the upper part and the lower part are in the connected state, the second counterbores and the through holes are correspondingly communicated one by one. The split lower tool holder for the laser welding machine further includes a mounting member, and the mounting member mounts the upper part and the lower part as a whole on the laser welding machine through the second counterbores and the through holes.

[0009] Further, the first counterbores and the second counterbores penetrate the upper inclined planes, and the threaded holes and the through holes penetrate the lower inclined planes.

[0010] Further, the first counterbores are symmetrically arranged with respect to the central axis of the upper part, and along the length direction of the upper part, the distances between two symmetrically arranged first counterbores are alternately different first distances and second distances.

[0011] Further, two upper grooves extending along the length direction of the upper part are formed on both sides of the first counterbores on the upper inclined plane.

[0012] Further, two lower grooves extending along the length direction of the lower part are formed on both sides of the threaded holes on the lower inclined plane.

[0013] Further, the upper grooves and the lower grooves correspond to each other one by one.

[0014] Further, a processing groove extending along the length direction is further formed on the upper surface of the upper part, and lower tool blade grooves for mounting lower tool blades are formed on both sides of the notch of the processing groove.

[0015] The processing method of the split lower tool holder for the laser welding machine includes the following steps: S1, producing blank parts of the upper part and the lower part; S2, finely processing the upper inclined plane and the upper plane of the upper part, and finely processing the lower inclined plane and the lower plane of the lower part so that the upper inclined plane and the lower inclined plane can be correspondingly attached and a clearance can be formed between the upper plane and the lower plane; S3, using the connecting member to fix the upper part and the lower part in the connected state, and then processing other parts of the upper part and the lower part.

[0016] Compared with the prior art, the split lower tool holder of the laser welding machine provided by the present invention adopts a split structure, and a yielding gap is formed between the upper part and the lower part. When shearing the strip steel, the downward shearing force F1 will cause the upper part to form a bending moment that bends inward, which offsets the bending moment that bends outward formed by the lateral force F2, weakens the effect of the lateral force F2 on the outward bending of the upper part, prolongs the service life of the lower tool holder, reduces the maintenance frequency of the lower tool holder, and improves the working efficiency of the laser welding machine;

[0017] The processing method of the split lower tool holder of the laser welding machine provided by the present invention preferably finely processes the upper and lower inclined surfaces and the upper and lower planes, and then processes other parts of the upper and lower parts after assembling the upper and lower parts together, ensuring the processing accuracy of the upper and lower inclined surfaces and the upper and lower planes, and further ensuring the shearing quality of the steel strip.

[0018] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and to be implemented in accordance with the content of the specification, the preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The specific embodiments of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a double-edge shearing device of an existing laser welding machine;

[0021] Figure 2 is a force analysis diagram of the lower tool holder during shearing of an existing double-edge shearing device;

[0022] Figure 3 is a schematic structural diagram of an embodiment of the split lower tool holder of the laser welding machine provided by the present invention;

[0023] Figure 4 is Figure 1 a cross-sectional view of the upper part in;

[0024] Figure 5 is Figure 1 a cross-sectional view of the lower part in;

[0025] Figure 6 is a force analysis diagram of the lower tool holder during shearing of the double-edge shearing device provided by the present invention;

[0026] Figure 7 is a top view of the split lower tool holder of the laser welding machine provided by the present invention;

[0027] Figure 8 The flowchart of the processing method of the split lower tool rest of the laser welding machine provided by the present invention. Specific embodiments

[0028] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0029] Please refer to Figures 3 to 5 , the present invention provides a split lower tool rest for a laser welding machine. The split lower tool rest of the laser welding machine includes an upper part 1, a lower part 2, and a connecting member (not shown). The lower surface of the upper part 1 includes an upper plane 11 in the middle and two upper inclined planes 12 on both sides of the upper plane 11. The upper surface of the lower part 2 includes a lower plane 21 in the middle and two lower inclined planes 22 on both sides of the lower plane 21. The connecting member is detachably connected to the upper part 1 and the lower part 2 to fix the upper part 1 and the lower part 2 in a connected state. When the upper part 1 and the lower part 2 are in the connected state, the two upper inclined planes 12 and the two lower inclined planes 22 are correspondingly attached, and a clearance is formed between the upper plane 11 and the lower plane 21.

[0030] Please refer to Figure 6 , when shearing the strip steel, the upper part 1 is subjected to a downward shearing force F1 and a lateral force F2. Since a clearance is formed between the upper part 1 and the lower part 2, the downward shearing force F1 will cause the upper part 1 to form a bending moment M1 that bends inward, which cancels out the bending moment M2 that bends outward formed by the lateral force F2. The effect of the lateral force F2 on the outward bending of the upper part 1 is weakened, the service life of the lower tool rest is prolonged, the maintenance frequency of the lower tool rest is reduced, and the working efficiency of the laser welding machine is improved.

[0031] In this embodiment, the upper part 1 is formed with a plurality of first counterbores 13 penetrating through the upper part 1, and the lower part 2 is formed with a plurality of threaded holes 23. When the upper part 1 and the lower part 2 are in the connected state, the first counterbores 13 and the threaded holes 23 are correspondingly communicated one by one, and the connecting member connects the upper part 1 and the lower part 2 through the first counterbores 13 and the threaded holes 23. The connecting member can be a bolt of a suitable model that can be meshed and connected with the first counterbores 13 and the threaded holes 23.

[0032] The upper part 1 is further formed with a plurality of second counterbores 14 penetrating through the upper part 1, and the lower part 2 is formed with a plurality of through holes 24 penetrating through the lower part 2. When the upper part 1 and the lower part 2 are in the connected state, the second counterbores 14 and the through holes 24 are correspondingly communicated one by one. The split lower tool rest of the laser welding machine further includes a mounting member (not shown). The mounting member mounts the upper part 1 and the lower part 2 as a whole on the laser welding machine through the second counterbores 14 and the through holes 24. The mounting member can be a bolt of a suitable model that can be meshed and connected with the second counterbores 14 and the through holes 24.

[0033] In a preferred embodiment, the positions where the first counterbore 13 and the second counterbore 14 are arranged penetrate the upper inclined surface 12, and the positions where the threaded hole 23 and the through hole 24 are arranged penetrate the lower inclined surface 22. And referring to Figure 7 , both the upper part 1 and the lower part 2 are strip-shaped structures. The first counterbores 13 are symmetrically arranged on both sides of the upper part with respect to the central axis of the upper part 1, and along the length direction of the upper part, the distances between the two symmetrically arranged first counterbores 13 are alternately different first distances L1 and second distances L2. Make the first counterbores 13 on one side form a continuous W shape. This design is beneficial to more firmly connect the upper part 1 and the lower part 2 to make them a firm whole.

[0034] In this embodiment, a machining groove 15 along its length direction is further formed on the upper surface of the upper part 1, and lower blade grooves 16 for installing lower blades are formed on both sides of the notch of the machining groove 15.

[0035] In a preferred embodiment, two upper grooves 121 extending along the length direction of the upper part 1 are formed on both sides of the first counterbore 13 on the upper inclined surface 12. To reduce the fitting area between the upper inclined surface 12 and the lower inclined surface 22, thereby reducing the area of the upper inclined surface 12 that needs to be finely machined and shortening the fine machining time of the upper inclined surface 12.

[0036] Similarly, two lower grooves 221 extending along the length direction of the lower part 2 are formed on both sides of the threaded hole 23 on the lower inclined surface 22. To reduce the fitting area between the lower inclined surface 22 and the upper inclined surface 12, thereby reducing the area of the lower inclined surface 22 that needs to be finely machined and shortening the fine machining time of the lower inclined surface 22.

[0037] When both the upper inclined surface 12 and the lower inclined surface 22 have the upper grooves 121 and the lower grooves 221, the upper grooves 121 and the lower grooves 221 need to correspond one by one and have exactly the same length and width.

[0038] Please refer to Figure 8 , the processing method of the split lower tool holder of this laser welding machine includes the following steps: S1. Produce the blank parts of the upper part and the lower part. Specifically, use forgings of appropriate shapes and obtain the blank parts through forging, normalizing, rough machining, quenching and tempering and other processing means, and process connection structures such as counterbores, threaded holes, and through holes on the blank parts.

[0039] S2. Finish machining the upper plane 11 and the upper inclined surface 12 of the upper part 1, and finish machining the lower plane 21 and the lower inclined surface 22 of the lower part 2, so that the upper inclined surface 12 and the lower inclined surface 22 can be correspondingly fitted and a clearance can be formed between the upper plane 11 and the lower plane 21. Specifically, an arc transition is adopted between the inclined surface and the plane during processing, and manual scraping can be used to finely adjust the specific dimensions of the inclined surface. The upper inclined surface 12 and the lower inclined surface 22 are used as the processing bases, and the accuracy must be guaranteed, while the dimensions of other surfaces are left with a certain margin for subsequent processing.

[0040] S3. Fix the upper part 1 and the lower part 2 in a connected state using a connecting piece, and then process other parts of the upper part 1 and the lower part 2.

[0041] The present invention also provides a finite element stress analysis of the traditional integral lower tool rest and the split lower tool rest of the present application. When the existing integral lower tool rest is subjected to a downward shear force of 80t and a lateral force of 25t on one side, the top of the existing integral lower tool rest deforms 0.0087mm outward. When the split lower tool rest provided by the present invention is also subjected to a downward shear force of 80t and a lateral force of 25t on one side, the top deforms 0.0077mm outward.

[0042] The outer dimensions of the models analyzed above are all the same. The difference lies in whether the lower tool rest is of an integral design or a split design. From the above analysis and comparison, it can be seen that under the same force conditions, the top deformation of the split lower tool rest provided by the present invention is smaller, indicating that the overall structure of the split lower tool rest is superior to the traditional integral lower tool rest. The structure of the split lower tool rest can transfer the large deformation area at the top of the traditional lower tool rest to the middle part of the split lower tool rest, reducing the deformation of the top of the split lower tool rest, protecting the accuracy of the top of the split lower tool rest, i.e., the blade mounting surface, and greatly extending the service life of the lower tool rest.

[0043] Compared with the prior art, the split lower tool rest of the laser welding machine provided by the present invention adopts a split structure, and a yielding gap is formed between the upper part and the lower part. When shearing the strip steel, the downward shear force F1 will cause the upper part to form an inward bending moment, which cancels the outward bending moment formed by the lateral force F2, weakening the outward bending effect of the lateral force F2 on the upper part, extending the service life of the lower tool rest, reducing the maintenance frequency of the lower tool rest, and improving the working efficiency of the laser welding machine.

[0044] The processing method of the split lower tool rest of the laser welding machine provided by the present invention preferentially finely processes the upper and lower inclined surfaces and the upper and lower planes, and then processes other parts of the upper part and the lower part after assembling the upper part and the lower part together, ensuring the processing accuracy of the upper and lower inclined surfaces and the upper and lower planes, and thus ensuring the shearing quality of the steel strip.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A split lower tool holder for a laser welding machine, characterized in that, It includes: an upper part , a lower part and a connecting member. The lower surface of the upper part includes an upper flat surface in the middle and two upper inclined surfaces on both sides of the upper flat surface. The upper surface of the lower part includes a lower flat surface in the middle and two lower inclined surfaces on both sides of the lower flat surface. The connecting member is detachably connected to the upper part and the lower part for fixing the upper part and the lower part in a connected state; when the upper part and the lower part are in the connected state, the two upper inclined surfaces and the two lower inclined surfaces are correspondingly fitted, and a yielding gap is formed between the upper flat surface and the lower flat surface. The yielding gap causes the downward shear force received by the upper part to form an inward bending moment in the upper part, which cancels the outward bending moment formed by the lateral force received by the upper part.

2. The split lower tool rest of the laser welding machine according to claim 1, characterized in that A plurality of first counterbores penetrating the upper part are formed in the upper part, and a plurality of threaded holes are formed in the lower part. When the upper part and the lower part are in the connected state, the first counterbores and the threaded holes are correspondingly communicated one by one, and the connecting member connects the upper part and the lower part through the first counterbores and the threaded holes.

3. The split lower tool rest of the laser welding machine according to claim 2, characterized in that, A plurality of second counterbores penetrating the upper part are formed in the upper part, and a plurality of through holes penetrating the lower part are formed in the lower part. When the upper part and the lower part are in the connected state, the second counterbores and the through holes are correspondingly communicated one by one. The split lower tool holder of the laser welding machine further includes a mounting member, and the mounting member mounts the upper part and the lower part on the laser welding machine as a whole through the second counterbores and the through holes.

4. The split lower tool rest of the laser welding machine according to claim 3, characterized in that, The first counterbores and the second counterbores penetrate the upper inclined surfaces, and the threaded holes and the through holes penetrate the lower inclined surfaces.

5. The split lower tool rest of the laser welding machine according to claim 4, characterized in that, The first counterbores are symmetrically arranged with respect to the central axis of the upper part, and along the length direction of the upper part, the distances between two symmetrically arranged first counterbores are alternately different first distances and second distances.

6. The split lower tool rest of the laser welding machine according to claim 4, wherein, Two upper grooves extending along the length direction of the upper part are formed on the upper inclined surfaces on both sides of the first counterbores.

7. The split lower tool rest of the laser welding machine according to claim 6, characterized in that, Two lower grooves extending along the length direction of the lower part are formed on the lower inclined surfaces on both sides of the threaded holes.

8. The split lower tool rest of the laser welding machine according to claim 7, characterized in that, The upper grooves and the lower grooves correspond to each other one by one.

9. The split lower tool rest of the laser welding machine according to claim 1, characterized in that, A machining groove extending along its length direction is further formed on the upper surface of the upper part, and lower blade grooves for mounting lower blades are formed on both sides of the notch of the machining groove.

10. A processing method for the split lower tool rest of a laser welding machine according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Produce the blank parts of the upper part and the lower part; S2. Finish machining the upper inclined surface and the upper flat surface of the upper part, and finish machining the lower inclined surface and the lower flat surface of the lower part so that the upper inclined surface and the lower inclined surface can be correspondingly fitted and the yielding gap can be formed between the upper flat surface and the lower flat surface; S3. Fix the upper part and the lower part in the connected state by using the connecting member, and then machine the other parts of the upper part and the lower part.

Images