Sharpening process of machining tools and sharpened machining tools

Abstract

The application belongs to the technical field of CNC tool sharpening, and particularly relates to a machining tool sharpening process and a sharpened machining tool. It solves the defects of unreasonable design in the prior art. The machining tool sharpening process comprises the following steps: S1, setting qualified parameter values of a machining tool; S2, installing a machining tool to be sharpened in a chuck, finding current coordinate values of the machining tool to be sharpened through a probe, and making the probe obtain a tool tip 0-degree value of the machining tool to be sharpened through multi-axis linkage; and S3, sharpening the machining tool to be sharpened in S2 according to the qualified parameter values set in S1 through a sharpening wheel. The application has the advantages of greatly improving sharpening efficiency, ensuring the accuracy of sharpened end edges, ensuring the consistency of sharpening accuracy of similar tools, and ensuring the accuracy of subsequent machining.

Description

Technical Field

[0001] This invention belongs to the field of CNC tool regrinding technology, and particularly relates to a regrinding process for machining tools and regrinding machining tools. Background Technology

[0002] Machining tools are an important tool in CNC machining and other machining processes.

[0003] After machining, cutting tools will wear out and need to be re-sharpened. Re-sharpening can be done manually or mechanically.

[0004] Manual grinding is inaccurate and inefficient, resulting in a large inventory of cutting tools.

[0005] Mechanical re-grinding involves further re-grinding the existing end-cutting edge. This approach has significant drawbacks: re-grinding requires repeatedly searching for the starting position of the end-cutting edge for repair, resulting in low re-grinding efficiency. Furthermore, due to variations in the starting position of the end-cutting edge for repair, the machining accuracy of the cutting tools cannot be guaranteed to be consistent. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a regrinding process for machining tools and a regrinding tool for machining tools that can solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] The regrinding process for this machining tool includes the following steps:

[0009] S1. Set the qualified parameter values ​​for the machining tool;

[0010] S2. Install the tool to be honed in the chuck, find the current coordinate value of the tool to be honed through the probe, and obtain the 0-degree value of the tool tip through multi-axis linkage.

[0011] S3. The tool to be refurbished in S2 is refurbished using a refurbishing wheel according to the qualified parameter values ​​set in S1.

[0012] The grinding step in S3 includes the following:

[0013] S31. The end edge of the tool to be repaired is ground flat using a tool end edge grinding wheel;

[0014] S32. The chip groove of the tool to be refurbished after S31 is refurbished by the tool end edge second clearance angle refurbishing wheel, and the tool end edge second clearance angle surface is machined.

[0015] S33. The second rear angle surface after S32 is processed by the tool end edge first rear angle grinding wheel to process the tool end edge first rear angle surface, thereby obtaining a number of end face cutting edges that are evenly distributed in a circle and have a cutting edge inclination angle.

[0016] After the tool end edge first rear angle grinding wheel finishes machining the tool end edge first rear angle surface, the tool end edge first rear angle grinding wheel chamfers the outer sharp angle formed by the tool end edge second rear angle surface and the tool end edge first rear angle surface.

[0017] In the above-mentioned tool regrinding process, in S2, the tool to be regrinded is in a horizontal state and the tool holder of the tool to be regrinded is installed in the chuck, and the cutting edge of the tool to be regrinded is suspended in the air.

[0018] In the above-mentioned tool regrinding process, the chuck is rotated by a rotary drive so that the cutting edge of the tool to be regrinded is at a set machining angle.

[0019] In the above-mentioned tool regrinding process, in step S31, the axis of the tool end-edge grinding wheel and the axis of the tool to be regrinded are perpendicularly distributed.

[0020] In the above-mentioned tool regrinding process, in step S3, the regrinding wheel and the probe are fixed on a four-axis drive.

[0021] In the above-mentioned tool regrinding process, the probe obtains the 0-degree value of the tool tip of the tool to be regrinded through the four-axis drive.

[0022] In the above-mentioned tool grinding process, in step S33, the chamfer is a rounded corner.

[0023] In the above-mentioned tool regrinding process, in step S2, the tools to be regrinded are stored in different feed trays according to their categories. Each feed tray has a number of slots for tools of the same category. The slots are arranged in at least one column or one row. The feed tray is provided with a clamping and clearance groove that communicates with the slots. The feed tray is fixed to the lower side of the chuck by a detachable mechanism.

[0024] In the above-mentioned tool regrinding process, a tool-retrieving robot is provided above the feeding tray and the chuck.

[0025] In the above-mentioned tool regrinding process, in step S31, the outer circumferential surface of the tool end-edge grinding wheel is tangent to the 0-degree tool tip of the tool to be regrinded.

[0026] This application also provides a tool for regrinding machining, which is obtained by regrinding machining tools through a regrinding process.

[0027] Compared with existing technologies, the advantages of this application are:

[0028] The tool turnover is fast, which can greatly improve the efficiency of regrinding, ensure the accuracy of regrinding the end edge, ensure the consistency of regrinding accuracy of similar tools, and ensure the accuracy of subsequent machining. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the grinding process of the machining tools provided by the present invention.

[0030] Figure 2 This is a flowchart illustrating the actual machining process of the tool regrinding technology provided by the present invention.

[0031] Figure 3 This is a schematic diagram of the automatic clamping process for machining tools provided by the present invention.

[0032] In the figure, there is a material tray 1, a placement groove 10, a clamping and clearance groove 11, a chuck 2, a regrinding tool 4, a tool end edge first rear angle face 41, a tool end edge second rear angle face 42, a chamfer 43, a tool end edge grinding wheel 50, a tool end edge second rear angle regrinding wheel 51, and a tool end edge first rear angle regrinding wheel 52. Detailed Implementation

[0033] The following are specific embodiments of the invention, which are described in conjunction with the accompanying drawings. The technical solution of the invention will be further described, but the invention is not limited to these embodiments.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, the regrinding process of this machining tool is used to regrind the machining tools that have already been used, which can also be understood as repair, so that the machining tools can be reused, thereby reducing production costs and alleviating the pressure of tool inventory.

[0036] Specifically, the tool regrinding process in this embodiment includes the following steps:

[0037] S1. Set the qualified parameter values ​​for the machining tools; for example, there are four types of tools: A, B, C, and D. Set the qualified parameter values ​​for the same type of tool for different types of tools. The qualified parameter values ​​are integrated into the grinding machine tool system.

[0038] S2. Install the tool to be honed into the chuck. The chuck is a pneumatic chuck that can rotate. Use a probe to find the current coordinate value of the tool to be honed, such as its current height, etc., and use multi-axis linkage (four axes in this embodiment) to make the probe obtain the 0-degree value of the tool tip of the tool to be honed.

[0039] Furthermore, the tool to be retarded is in a horizontal position, and the tool holder is mounted in a chuck, with the cutting edge of the tool suspended in the air. The chuck is rotated by a rotary drive so that the cutting edge of the tool to be retarded is at a set machining angle. The rotation angle can be controlled by an indexing plate to improve retardation accuracy.

[0040] S3. The tool to be refurbished in S2 is refurbished using a refurbishing wheel according to the qualified parameter values ​​set in S1.

[0041] In a preferred embodiment, the grinding wheel and probe are fixed to a four-axis drive. Four-axis drives are existing technology.

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, the specific steps are as follows:

[0043] S31. The end edge of the tool to be refurbished is ground flat using a tool end edge grinding wheel 50; the tool end edge grinding wheel has a cylindrical structure. The tool end edge grinding wheel is a V90 degree grinding wheel.

[0044] This embodiment completely changes the previous regrinding method. By reshaping the new end edge by grinding the end edge flat, it can directly solve the problem of repeatedly checking the alignment in the end edge regrinding method, which can greatly improve regrinding efficiency, ensure the accuracy of end edge regrinding, ensure the consistency of regrinding accuracy of similar tools, and ensure the accuracy of subsequent machining.

[0045] During regrinding, the axis of the tool tip grinding wheel is perpendicular to the axis of the tool to be regrinded. That is, the probe obtains the 0-degree value of the tool tip via a four-axis drive. The outer circumferential surface of the tool tip grinding wheel is tangent to the 0-degree tool tip. The rotational speed of the tool tip grinding wheel is faster than that of the tool to be regrinded. Simultaneously, during regrinding, the tool tip grinding wheel undergoes a translational feed motion towards the tool to be regrinded while rotating.

[0046] S32. The chip groove of the tool to be refurbished after S31 is refurbished by the tool end edge second clearance angle refurbishing wheel 51, and the tool end edge second clearance angle surface is machined; the tool end edge second clearance angle refurbishing wheel is a V60 degree grinding wheel.

[0047] The second clearance angle face of the cutting edge can provide a prerequisite for the formation of the cutting edge.

[0048] S33. The second rear angle surface after S32 is processed by the tool end edge first rear angle grinding wheel 52 to process the tool end edge first rear angle surface, thereby obtaining several end face cutting edges that are evenly distributed in a circle and have a cutting edge inclination angle; the tool end edge first rear angle grinding wheel is a V30 degree grinding wheel.

[0049] The first clearance angle face of the cutting edge is obtained by further machining and grinding based on the second clearance angle face of the cutting edge. This is to prevent the spiral edge of the cutting edge from being wasted due to rapid grinding during a single grinding. At the same time, the first clearance angle face and the second clearance angle face of the cutting edge can give the cutting edge better machining clearance space, while also ensuring the structural strength of the cutting edge.

[0050] After the first relief angle grinding wheel finishes machining the first relief angle face of the tool end edge, the grinding wheel then chamfers the outer sharp angle formed by the second relief angle face and the first relief angle face of the tool end edge. The chamfer is a rounded corner. Chamfering can solve the problem of the outer sharp angle of the machining tool easily chipping or breaking.

[0051] The above process completes the entire grinding process.

[0052] Example 2

[0053] Based on Embodiment 1, this embodiment uses a mechanical method to automatically clamp the machining tools that need to be sharpened. Specifically:

[0054] like Figure 3 As shown, the cutting tools that need to be re-sharpened are stored in different feeding trays 1 according to their categories. The feeding tray 1 has several placement slots 10 for the same type of cutting tools. The placement slots 10 are distributed in at least one column or one row. The feeding tray 1 is provided with a clamping and avoidance groove 11 that communicates with the placement slots. The feeding tray 1 is fixed to the machine platform below the side of the chuck by a detachable mechanism.

[0055] The distance between two adjacent placement slots 10 on the material tray 1 is set, and the program automatically calculates the coordinate value of the next tool for machining through variable values.

[0056] A tool-retrieving robot is installed above the material tray 1 and the chuck 2. The tool-retrieving robot is a universal robot that can retrieve tools to be retarded and release tools that have already been retarded. The gripping clearance groove 11 provides clearance for the tool-retrieving robot to retrieve and release tools.

[0057] After automatic clamping and machining are completed, the machine automatically switches to the next tool, saving the time of waiting for the indicator lights to turn on and increasing productivity.

[0058] Multiple cutting tools can be placed on the tray at the same time for processing, eliminating the need for frequent loading and unloading and saving manpower.

[0059] Automatic clamping uses point coordinates for clamping, resulting in smaller error values ​​and higher accuracy.

[0060] Example 3

[0061] like Figure 2 As shown, this embodiment provides a regrinding tool 4, which is obtained by regrinding the tool through the regrinding process of the tool in Embodiment 1. The regrinding tool includes an end edge formed by a spiral groove and a first rear angle facet 41 of the tool end edge, and the first rear angle facet 41 of the tool end edge is disposed on a second rear angle facet 42 of the tool end edge.

[0062] The first rear facet 41 and the second rear facet 42 of the cutting edge are slopes with different inclination angles. A chamfer 43 is provided at the outer sharp corner of the cutting edge 40.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A regrinding process for machining tools, characterized in that, The grinding process includes the following steps: S1. Set the qualified parameter values ​​for the machining tool; S2. Install the tool to be honed in the chuck, find the current coordinate value of the tool to be honed through the probe, and obtain the 0-degree value of the tool tip through multi-axis linkage. S3. The tool to be refurbished in S2 is refurbished using a refurbishing wheel according to the qualified parameter values ​​set in S1. The grinding step in S3 includes the following: S31. The end edge of the tool to be repaired is ground flat by a tool end edge grinding wheel; the axis of the tool end edge grinding wheel and the axis of the tool to be repaired are perpendicularly distributed; the outer circumferential surface of the tool end edge grinding wheel is tangent to the 0-degree tip of the tool to be repaired. S32. The chip groove of the tool to be refurbished after S31 is refurbished by the tool end edge second clearance angle refurbishing wheel, and the tool end edge second clearance angle surface is machined. S33. The second rear angle surface after S32 is processed by the tool end edge first rear angle grinding wheel to process the tool end edge first rear angle surface, thereby obtaining a number of end face cutting edges that are evenly distributed in a circle and have a cutting edge inclination angle. After the tool end edge first rear angle grinding wheel finishes machining the tool end edge first rear angle surface, the tool end edge first rear angle grinding wheel chamfers the outer sharp angle formed by the tool end edge second rear angle surface and the tool end edge first rear angle surface.

2. The tool regrinding process according to claim 1, characterized in that, In S2 above, the tool to be refurbished is in a horizontal position and the tool holder is installed in the chuck, and the cutting edge of the tool to be refurbished is suspended in the air.

3. The tool regrinding process according to claim 2, characterized in that, The chuck is rotated by a rotary drive so that the cutting edge of the tool to be refurbished is at a set machining angle.

4. The tool regrinding process according to claim 1, characterized in that, In step S3, the grinding wheel and the probe are fixed to the four-axis drive.

5. The tool regrinding process according to claim 4, characterized in that, The probe obtains the 0-degree value of the tool tip of the tool to be refurbished through the four-axis drive.

6. The tool regrinding process according to claim 1, characterized in that, In S33, the chamfer is a rounded corner.

7. The tool regrinding process according to claim 1, characterized in that, In step S2, the cutting tools to be honed are stored in different feed trays according to their categories. Each feed tray has a number of slots for the same type of cutting tools. The slots are arranged in at least one column or row. The feed tray is provided with a clamping and clearance groove that communicates with the slots. The feed tray is fixed to the lower side of the chuck by a detachable mechanism.

8. The tool regrinding process according to claim 7, characterized in that, A tool-retrieving robot is provided above the feeding tray and the chuck.

9. A tool for regrinding and sharpening, characterized in that, The machining tool is obtained by grinding using the grinding process described in any one of claims 1-8.

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