A blade edge jig for hardening a blade edge by using a steel bar

Abstract

This utility model discloses a tooling fixture for hardening the cutting edge using steel bars. The tooling fixture includes a base, and the top surface of the base has a steel bar positioning station and a steel bar welding station arranged sequentially from top to bottom. The steel bar positioning station is used to perform multi-point positioning of the steel bar and the cutting edge of the tool to be processed by laser welding, resulting in a laser-positioned tool. The steel bar welding station is used to perform laser welding of the contact surface between the laser-positioned tool and the steel bar, resulting in a processed tool. In the tooling fixture of this utility model, the tool is processed in a flat position, and its path programming does not need to consider the Z-axis height change. Moreover, the laser welding processing method only requires one processing to complete the hardening processing of a single tool, which is simple and efficient. Furthermore, during the laser processing, only working parameters such as laser power, moving speed, and protective gas volume need to be controlled, resulting in a small number of working parameters that are easy to control and easy control of processing quality.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool processing technology, and specifically relates to a cutting edge fixture that uses steel bars to harden the cutting edge. Background Technology

[0002] Hardening of the blade is a method of blade treatment. Most existing blade hardening technologies are laser cladding technology, also known as cladding powder, which is expensive and has requirements for management environment.

[0003] For example, Chinese invention patent CN202110038015.7 discloses a blade cladding device that uses a robotic arm to pick up a blade for blade cladding. It includes an automatic blade pushing mechanism, a cladding machine platform, and an automatic feeding mechanism. A first mounting platform is provided on one side of the cladding machine platform, and a second mounting platform is provided on the other side. A laser cladding head mounting bracket is provided on the first mounting platform, and a laser cladding head is mounted on the bracket. A robotic arm is provided on the second mounting platform. The robotic arm drives a gripper assembly to pick up a blade from the automatic blade pushing mechanism and move it directly below the laser cladding head. The laser cladding head clads the blade edge. The robotic arm moves the blade below the laser cladding head according to a set cladding trajectory. By using a robotic arm to drive the gripper assembly, which operates according to a computer-set motion trajectory, it can replace manual material handling and cladding work.

[0004] Although the aforementioned patent documents solve some problems in the prior art, the tool clamping method described in these patent documents uses a gripper assembly including a gripper cylinder. The gripper cylinder controls the opening and closing of two gripping arms to vertically clamp the tool with the cutting edge facing upwards. Gripping blocks are provided on the corresponding surfaces of the two gripping arms. The laser cladding head clads the cutting edge of the tool, and the robotic arm moves the tool below the laser cladding head according to a set cladding trajectory. Analysis reveals the following problems with the above-mentioned powder cutting edge hardening method: 1. The cutting edge is always processed vertically during the process, requiring consideration of Z-axis height changes in the processing path; 2. During powder cutting edge hardening, a single tool needs to be claded back and forth multiple times to complete the processing, resulting in low efficiency; 3. The powder cutting edge hardening process requires controlling multiple operating parameters such as laser power, laser focal length, powder output, protective gas volume, moving speed, and cladding path, making the process control complex.

[0005] Therefore, it is necessary to design a cutting edge fixture that uses steel bars to harden the cutting edge in order to simplify and improve the efficiency of the machining process. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tooling fixture for hardening cutting edges using steel bars. The tooling fixture includes a base, with a steel bar positioning station and a steel bar welding station sequentially formed on the top surface of the base from top to bottom. The steel bar positioning station is used to laser-weld the steel bar to the cutting edge of the tool to be processed at multiple points for positioning, resulting in a laser-positioned tool. The steel bar welding station is used to laser-weld the contact surface between the laser-positioned tool and the steel bar, resulting in a finished tool. In this invention, the tool is processed in a flat position, eliminating the need to consider Z-axis height changes in the path programming. Furthermore, the laser welding process only requires one pass to complete the hardening of a single tool, resulting in a simple and efficient process. Additionally, during laser processing, only operating parameters such as laser power, moving speed, and protective gas volume need to be controlled, making it easier to control the processing quality.

[0007] The technical problem to be solved by this utility model is to provide a cutting edge fixture that uses steel bars to harden the cutting edge, which addresses the shortcomings of the prior art. The fixture includes a base, and the top surface of the base is provided with a steel bar positioning station and a steel bar welding station from top to bottom.

[0008] The steel bar positioning station is used to perform multi-point positioning of the steel bar and the cutting edge of the tool to be processed by laser welding, so as to obtain the tool after laser cutting edge positioning;

[0009] The steel bar welding station is used to laser weld the cutting edge of the tool after laser positioning to the contact surface of the steel bar to obtain the finished tool.

[0010] Preferably, the steel bar positioning station is a groove one recessed into the top surface of the base. The upper end of the groove one is provided with a steel bar groove one for accommodating the steel bar. The left and right ends of the groove one are respectively provided with a positioning protrusion one and a positioning protrusion two for positioning the side of the tool. The lower end of the groove one is an open structure.

[0011] Preferably, the steel bar welding station is a groove two recessed into the top surface of the base. The lower end of the groove two is provided with a steel bar groove two for accommodating the steel bar after it is positioned on the cutting edge of the tool. The left and right ends of the groove two are respectively provided with positioning protrusion three and positioning protrusion four for positioning the side of the tool. The lower end of the groove two is an open structure.

[0012] Preferably, the lower and upper ends of the top surface of the base are respectively provided with cylinder pushing devices for positioning the back of the tool.

[0013] Preferably, the cylinder pushing device includes two sets of cylinders, and a push block is fixedly provided on the top of the push rod of each set of cylinders. A positioning block is detachably fixedly connected to the top of the push block.

[0014] Preferably, the positioning block includes a positioning block body, the positioning block body is provided with countersunk bolt holes for installing and removing the positioning block, and the positioning block is provided with a positioning groove on the side facing the tool, the surface of the positioning groove that abuts against the tool is an inclined surface.

[0015] Preferably, the steel bar positioning station further includes a pressure plate for limiting the steel bar from the top. The pressure plate is composed of an integrally formed mounting part and a limiting part. The limiting part is recessed inward relative to the mounting part to form a pressing groove. Multiple first laser positioning points are evenly distributed on the pressure plate along the length direction of the pressing groove. The first laser positioning point is an arc groove penetrating the pressure plate. The oblique cut at the top of the pressure plate along the length direction of the pressing groove is a second laser positioning point. The arc chamfer at the bottom of the pressure plate along the length direction of the pressing groove is a third laser positioning point.

[0016] Preferably, a pressure plate positioning hole is provided on the pressure plate mounting part of the base located between the steel bar positioning station and the steel bar welding station, and a pressure plate fixing hole corresponding to the position of the pressure plate positioning hole is provided on the pressure plate.

[0017] Preferably, the second steel bar groove penetrates the base and is formed by wire cutting.

[0018] Preferably, the shape of the steel strip is adapted to the cutting edge of the tool to be processed, and the length of the steel strip is greater than the length of the cutting edge of the tool to be processed.

[0019] In practical use, the above-mentioned method of hardening the cutting edge using a cutting edge fixture with steel bars includes the following steps:

[0020] Step 1: Place the steel bar in the steel bar groove 1 of the steel bar positioning station;

[0021] Step 2: Place the cutting tool to be processed in the groove 1 of the steel bar positioning station, and place the cutting edge of the cutting tool against the side of the steel bar;

[0022] Step 3: Activate the cylinder to push the push rod, which will move the positioning block towards the tool to be processed until the positioning groove of the positioning block abuts against the back of the tool to be processed. The cylinder continues to push the push rod to make the positioning groove of the positioning block press tightly against the back of the tool to be processed with a certain pressure.

[0023] Step 4: Align the positioning holes on the pressure plate with the fixing holes on the pressure plate and fix them with bolts;

[0024] Step 5: Use a laser welding machine to perform laser welding positioning on the second laser positioning point, the third laser positioning point, and multiple first laser positioning points to obtain the tool after laser blade positioning;

[0025] Step 6: Remove the laser-positioned cutting tool from Step 5, place the laser-positioned cutting tool in Groove 2 of the steel strip welding station, and adjust the position of the steel strip so that it is located in Groove 2.

[0026] Step 7: Activate the cylinder to push the push rod, which will move the positioning block towards the tool after the laser cutting edge is positioned, until the positioning groove of the positioning block abuts against the back of the tool. The cylinder continues to push the push rod to make the positioning groove of the positioning block press tightly against the back of the tool with a certain pressure.

[0027] Step 8: Use a laser welding machine to perform laser welding on the contact surface between the cutting edge of the tool and the steel strip after laser positioning in step 7. The laser welding process adopts a single-sided laser welding process to obtain the processed tool.

[0028] Compared with the prior art, the positive effects of this utility model are:

[0029] (1) Compared with the existing powder hardening blade cladding method, the tool is in a vertical position during the processing. Since the blade profile is curved on the Z-axis, the processing path programming needs to consider the change of Z-axis height. However, the method of hardening the blade with steel strip and the blade fixture in this utility model adopts a horizontal processing method during the tool processing. The processing path programming does not need to consider the change of Z-axis height. Obviously, the processing path programming in this utility model is simple and easy to operate.

[0030] (2) Compared with the existing powder hardening blade cladding method, which requires multiple back-and-forth cladding processes for a single tool to complete the processing of a single tool, the present invention uses steel strips to harden the blade and a blade fixture. In the process of hardening the steel strip blade, conventional metal materials and high-performance ACUTO440 steel strips are placed in close contact with each other in the steel strip positioning station and then fixed with cylinders and pressure plates. First, the laser blade positioning hardens the steel strip. After the laser positioning is completed, it is placed in the steel strip welding station for laser welding. The laser welding adopts a single-sided laser welding process, which only requires one processing to complete the hardening of a single tool. Obviously, the processing technology in the present invention is simple and efficient.

[0031] Meanwhile, the tooling fixture in this utility model is fixed by setting a "cylinder pushing device" and a "positioning groove that matches the blade width" on the back of the blade to achieve a double fixing effect on the blade. The blade hardened steel strip and the blade base material need to be tightly fitted when positioning, which realizes the stability of the tool during the tool processing.

[0032] (3) Compared with the existing powder hardening blade cladding method, the processing process requires consideration of the influence of the curve distribution of the powder and blade contours on the Z-axis on the processing accuracy. Therefore, multiple working parameters such as laser power, laser focal length, powder output, protective gas volume, moving speed, and cladding technique need to be controlled. However, the method of hardening the blade with steel strips and the blade fixture in this utility model only requires control of a few working parameters such as laser power, moving speed, and protective gas volume during the steel strip blade hardening process. Compared with the working parameters of the powder hardening method, the number of working parameters that need to be controlled in this utility model is smaller, and it is easier to control the quality of the processed products. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the tool after machining in this utility model;

[0034] Figure 2 This is a schematic diagram of the steel bar structure in this utility model;

[0035] Figure 3 This is a schematic diagram of the base structure in this utility model;

[0036] Figure 4 This is a schematic diagram of the main structure of the pressure plate in this utility model;

[0037] Figure 5 This is a side view of the pressure plate in this utility model.

[0038] Figure 6 Here are three views of the positioning block in this utility model;

[0039] Figure 7 This is a schematic diagram of the cylinder-driven device in this utility model;

[0040] Figure 8 This is a schematic diagram of the assembly structure of the knife-edge fixture in this utility model;

[0041] The markings in the attached diagram are as follows: 1-Cutter, 11-Cutter body, 12-Hardened part, 2-Steel bar, 3-Base, 31-Cylinder mounting hole one, 32-Base mounting hole one, 33-Groove two, 34-Positioning protrusion four, 35-Steel bar groove two, 36-Pressure plate mounting part, 37-Positioning protrusion two, 38-Groove one, 39-Base mounting hole two, 310-Cylinder mounting hole two, 311-Positioning protrusion one, 312-Positioning protrusion three, 313-Pressure plate positioning hole, 4-Pressure plate, 41-Mounting part, 42-First laser positioning point, 43-Limiting part, 44-Pressure plate fixing hole, 5-Positioning block, 51-Positioning block body, 52-Counterhead bolt hole, 53-Positioning groove, 6-Cylinder pushing device. Detailed Implementation

[0042] The following is combined with Figure 1-8 The present invention will be further described with reference to specific embodiments.

[0043] See appendix Figure 1 This is a schematic diagram of the structure of the tool 1 after processing in this utility model. It consists of a tool body 11 and a hardened part 12, wherein the hardened part 12 is formed by laser welding a steel strip 2 to the tool body 11.

[0044] See appendix Figure 2 This is a schematic diagram of the structure of the steel bar 2 in this utility model. Its shape is adapted to the blade part of the blade body 11, and its length is longer than the length of the blade part of the blade body 11.

[0045] See appendix Figure 3-8 This utility model proposes a blade fixture that uses steel bars to harden the blade edge, including a base 3. The top surface of the base 3 has a steel bar positioning station and a steel bar welding station arranged sequentially from top to bottom.

[0046] The steel bar positioning station is used to perform multi-point positioning of the steel bar 2 and the cutting edge of the tool to be processed by laser welding, so as to obtain the tool after laser cutting edge positioning;

[0047] The steel bar welding station is used to laser weld the cutting edge of the tool after laser positioning to the contact surface of the steel bar 2, so as to obtain the processed tool 1;

[0048] The base 3 has two base mounting holes 32 at the top upper surface and two base mounting holes 39 at the bottom upper surface. The base 3 is detachably and fixedly installed on the base platform through the two base mounting holes 32 and the two base mounting holes 39.

[0049] The steel bar positioning station is a groove 38 recessed into the top surface of the base 3. The upper end of the groove 38 is provided with a steel bar groove for accommodating the steel bar 2. The left and right ends of the groove 38 are respectively provided with a positioning protrusion 311 and a positioning protrusion 37 for positioning the side of the tool. The lower end of the groove 38 is an open structure.

[0050] The steel bar welding station is a groove 33 recessed into the top surface of the base 3. The lower end of the groove 33 is provided with a steel bar groove 35 for accommodating the steel bar 2 after it is positioned on the cutting edge of the tool. The left and right ends of the groove 33 are respectively provided with a positioning protrusion 312 and a positioning protrusion 34 for positioning the side of the tool. The lower end of the groove 33 is an open structure.

[0051] The lower and upper ends of the top surface of the base 3 are respectively provided with cylinder pushing devices 6 for positioning the back of the tool; the cylinder pushing device 6 includes two sets of cylinders, and a push block is fixedly provided on the top of the push rod of each set of cylinders, and a positioning block 5 is detachably fixedly connected to the top of the push block.

[0052] Each set of cylinders in the cylinder pushing device 6 at the lower end of the top surface of the base 3 is detachably and fixedly connected to the top surface of the base 3 through a set of cylinder mounting holes 310. The number of sets of cylinder mounting holes 310 is three.

[0053] Each set of cylinders in the cylinder pushing device 6 at the upper end of the top surface of the base 3 is detachably and fixedly connected to the top surface of the base 3 through a set of cylinder mounting holes 31, and the number of the set of cylinder mounting holes 31 is three.

[0054] The positioning block 5 includes a positioning block body 51, and the positioning block body 51 is provided with countersunk bolt holes 52 for installing and removing the positioning block 5. The positioning block 5 is provided with a positioning groove 53 on the side facing the tool, and the surface of the positioning groove 53 that abuts against the tool is an inclined surface.

[0055] The steel bar positioning station also includes a pressure plate 4 for limiting the steel bar 2 from the top. The pressure plate 4 is composed of an integrally formed mounting part 41 and a limiting part 43. The limiting part 43 is recessed inward relative to the mounting part 41 to form a pressing groove. Multiple first laser positioning points 42 are evenly distributed on the pressure plate 4 along the length direction of the pressing groove. The first laser positioning point 42 is an arc groove that penetrates the pressure plate 4. The oblique cut at the top of the pressure plate 4 along the length direction of the pressing groove is the second laser positioning point 42. The arc chamfer at the bottom of the pressure plate 4 along the length direction of the pressing groove is the third laser positioning point 42.

[0056] A pressure plate positioning hole 313 is provided on the pressure plate mounting part 36 located between the steel bar positioning station and the steel bar welding station on the base 3, and a pressure plate fixing hole 44 corresponding to the position of the pressure plate positioning hole 313 is provided on the pressure plate 4.

[0057] The steel bar groove 35 penetrates the base 3 and is manufactured by wire cutting.

[0058] In practical use, the above-mentioned method of hardening the cutting edge using a cutting edge fixture with steel bars includes the following steps:

[0059] Step 1: Place steel bar 2 in the steel bar groove 1 of the steel bar positioning station;

[0060] Step 2: Place the cutting tool to be processed in the groove 38 of the steel bar positioning station, and place the cutting edge of the cutting tool against the side of the steel bar 2.

[0061] Step 3: Activate the cylinder to push the push rod and move the positioning block 5 toward the tool to be processed until the positioning groove 53 of the positioning block 5 abuts against the back of the tool to be processed. The cylinder continues to push the push rod so that the positioning groove 53 of the positioning block 5 is pressed tightly against the back of the tool to be processed with a certain pressure.

[0062] Step 4: Align the positioning hole 313 on the pressure plate 4 with the fixing hole 44 on the pressure plate and fix it with bolts;

[0063] Step 5: Use a laser welding machine to perform laser welding positioning on the second laser positioning point 42, the third laser positioning point 42 and multiple first laser positioning points 42 to obtain the tool after laser blade positioning;

[0064] Step 6: Remove the laser-positioned cutting tool from Step 5 and place it in the groove 33 of the steel strip welding station. Adjust the position of the steel strip 2 so that it is located in the steel strip groove 35.

[0065] Step 7: Activate the cylinder to push the push rod, which will move the positioning block 5 towards the tool after the laser cutting edge is positioned, until the positioning groove 53 of the positioning block 5 abuts against the back of the tool. The cylinder continues to push the push rod to make the positioning groove 53 of the positioning block 5 press tightly against the back of the tool with a certain pressure.

[0066] Step 8: Use a laser welding machine to perform laser welding on the contact surface between the cutting edge of the tool after laser positioning in step 7 and the steel strip. The laser welding process adopts a single-sided laser welding process to obtain the processed tool 1.

[0067] Compared with the prior art, the positive effects of this utility model are:

[0068] (1) Compared with the existing powder hardening blade cladding method, the tool is in a vertical position during the processing. Since the blade profile is curved on the Z-axis, the processing path programming needs to consider the change of Z-axis height. However, the method of hardening the blade with steel strip and the blade fixture in this utility model adopts a horizontal processing method during the tool processing. The processing path programming does not need to consider the change of Z-axis height. Obviously, the processing path programming in this utility model is simple and easy to operate.

[0069] (2) Compared with the existing powder hardening blade cladding method, which requires multiple back-and-forth cladding processes for a single tool to complete the processing of a single tool, the present invention uses steel strips to harden the blade and a blade fixture. In the process of hardening the steel strip blade, conventional metal materials and high-performance ACUTO440 steel strips are placed in close contact with each other in the steel strip positioning station and then fixed with cylinders and pressure plates. First, the laser blade positioning hardens the steel strip. After the laser positioning is completed, it is placed in the steel strip welding station for laser welding. The laser welding adopts a single-sided laser welding process, which only requires one processing to complete the hardening of a single tool. Obviously, the processing technology in the present invention is simple and efficient.

[0070] Meanwhile, the tooling fixture in this utility model is fixed by setting a "cylinder pushing device" and a "positioning groove that matches the blade width" on the back of the blade to achieve a double fixing effect on the blade. The blade hardened steel strip and the blade base material need to be tightly fitted when positioning, which realizes the stability of the tool during the tool processing.

[0071] (3) Compared with the existing powder hardening blade cladding method, the processing process requires consideration of the influence of the curve distribution of the powder and blade contours on the Z-axis on the processing accuracy. Therefore, multiple working parameters such as laser power, laser focal length, powder output, protective gas volume, moving speed, and cladding technique need to be controlled. However, the method of hardening the blade with steel strips and the blade fixture in this utility model only requires control of a few working parameters such as laser power, moving speed, and protective gas volume during the steel strip blade hardening process. Compared with the working parameters of the powder hardening method, the number of working parameters that need to be controlled in this utility model is smaller, and it is easier to control the quality of the processed products.

[0072] The above description only illustrates the preferred technical solution of this utility model. Any modifications that may be made by those skilled in the art to certain parts of this utility model also reflect the principle of this utility model and should be within the technical scope of this utility model.

Claims

1. A cutting edge fixture that uses steel bars to harden the cutting edge, characterized in that, Includes a base (3), and the top surface of the base (3) is provided with a steel bar positioning station and a steel bar welding station from top to bottom; The base (3) is provided with a cylinder pushing device (6) for positioning the back of the tool at the lower and upper ends of the top surface. The steel bar positioning station includes a pressure plate (4) for limiting the steel bar (2) from the top. The pressure plate (4) is composed of an integrally formed mounting part (41) and a limiting part (43). The limiting part (43) is recessed inward relative to the mounting part (41) to form a pressing groove. Multiple first laser positioning points (42) are evenly distributed on the pressure plate (4) along the length direction of the pressing groove. The first laser positioning point (42) is an arc groove that penetrates the pressure plate (4). The oblique cut at the top of the pressure plate (4) along the length direction of the pressing groove is the second laser positioning point. The arc chamfer at the bottom of the pressure plate (4) along the length direction of the pressing groove is the third laser positioning point.

2. The cutting edge fixture as described in claim 1, characterized in that, The steel bar positioning station is a groove 1 (38) recessed into the top surface of the base (3). The upper end of the groove 1 (38) is provided with a steel bar groove 1 for accommodating the steel bar (2). The left and right ends of the groove 1 (38) are respectively provided with a positioning protrusion 1 (311) and a positioning protrusion 2 (37) for positioning the side of the tool. The lower end of the groove 1 (38) is an open structure.

3. A cutting edge fixture for hardening the cutting edge with steel bars as described in claim 2, characterized in that, The steel bar welding station is a groove two (33) recessed into the top surface of the base (3). The lower end of the groove two (33) is provided with a steel bar groove two (35) for accommodating the steel bar (2) after it is positioned on the cutting edge of the tool. The left and right ends of the groove two (33) are respectively provided with positioning protrusion three (312) and positioning protrusion four (34) for positioning the side of the tool. The lower end of the groove two (33) is an open structure.

4. A cutting edge fixture for hardening the cutting edge with steel bars as described in claim 3, characterized in that, The cylinder pushing device (6) includes two sets of cylinders. Each set of cylinders has a push block fixedly installed on the top of the push rod. The top of the push block is detachably fixedly connected to a positioning block (5).

5. A cutting edge fixture as described in claim 4, characterized in that, The positioning block (5) includes a positioning block body (51), and the positioning block body (51) is provided with countersunk bolt holes (52) for installing and removing the positioning block (5). The positioning block (5) has a positioning groove (53) on the side facing the tool, and the surface of the positioning groove (53) that abuts against the tool is an inclined surface.

6. A cutting edge fixture for hardening the cutting edge with steel bars as described in claim 5, characterized in that, A pressure plate positioning hole (313) is provided on the pressure plate mounting part (36) located between the steel bar positioning station and the steel bar welding station on the base (3), and a pressure plate fixing hole (44) corresponding to the position of the pressure plate positioning hole (313) is provided on the pressure plate (4).

7. A cutting edge fixture for hardening the cutting edge with steel bars as described in claim 2, characterized in that, The second steel bar groove (35) penetrates the base (3) and is made by wire cutting.

8. A cutting edge fixture for hardening the cutting edge with steel bars as described in claim 7, characterized in that, The shape of the steel bar (2) is adapted to the cutting edge of the tool to be processed, and the length of the steel bar (2) is greater than the length of the cutting edge of the tool to be processed.

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