A method for setting up a conical grinding wheel for initial use

Abstract

The present application belongs to the technical field of numerical control processing, and particularly relates to a method for tool setting when a conical grinding wheel is used for the first time, comprising the following steps: step S1, obtaining a target section type of the grinding wheel; step S2, aligning the center line of the grinding wheel with the center line of the roller; step S3, moving the grinding wheel according to the known target section type and obtaining a moving value to obtain an initial tool setting point; and step S4, setting a back engagement amount according to the position of the initial tool setting point to complete grinding wheel dressing. The present application can quickly and accurately find the initial tool setting point for grinding wheel dressing, improves the dressing efficiency of the grinding wheel, and has a wide range of applications.

Description

Technical Field

[0001] This invention belongs to the field of CNC machining technology, specifically relating to a tool setting method for the initial use of a conical grinding wheel. Background Technology

[0002] In tapered wheel generating grinding, since the taper of the wheel set is fixed when used initially, the tapered surface needs to be dressed to match the desired target wheel profile. When the machined profile and the target profile differ significantly, tool setting becomes more difficult. During the dressing process, it is necessary to find the initial tool setting point.

[0003] Existing grinding wheels are typically dressed in workshops using the feed method, such as the literature "A method for dressing the tooth profile of a worm grinding wheel based on VERICUT" and the literature "Research on grinding method and error analysis of double circular arc gears" in document number "10.27352 / d.cnki.gylgu.2023.001860". The method for finding the initial tool setting point using the feed method is as follows: To prevent excessive depth of cut from causing collisions between the grinding wheel and the roller, the dressing wheel is moved visually to a relatively far distance from the roller. As the grinding wheel moves according to the target profile, it initially moves in a figure-eight pattern, without contacting the roller, and returns to its initial position. Then, from this initial position, the grinding wheel moves a certain distance closer to the roller in the Z-direction, continuing to move in a figure-eight pattern. If the roller and grinding wheel do not contact, it continues to move closer in the Z-direction until a certain distance is reached. At this point, the grinding wheel and roller make contact at a specific point in the figure-eight pattern. This distance is the initial tool setting point in the Z-direction. Because using visual observation to move the grinding wheel and roller and the method of the grinding wheel returning to its initial position after one complete movement to find the initial tool setting point may involve multiple figure-eight cycles, the efficiency of grinding wheel dressing is extremely low. Summary of the Invention

[0004] This invention provides a method for setting the tool when using a conical grinding wheel for the first time, in order to solve the problem of low efficiency in finding the initial tool setting point of the grinding wheel in the prior art.

[0005] To achieve the above objectives, the technical solution provided by this invention is: a method for setting a conical grinding wheel for initial use, comprising the following steps:

[0006] Step S1: Obtain the target profile of the grinding wheel;

[0007] Step S2: Align the moving grinding wheel with the center line of the roller;

[0008] Step S3: Move the grinding wheel according to the known target profile and obtain the movement value to determine the initial tool setting point. The specific process is as follows:

[0009] After the grinding wheel reaches its initial position on the surface being measured, it moves according to the known target profile coordinates, using a point-by-point feed method. When the grinding wheel contacts the roller, it moves away from the roller in the Z-axis direction, and the current Z-axis offset value Z1 is recorded. The movement continues to the next profile coordinate point. If the roller contacts the grinding wheel again, the grinding wheel continues to move away from the roller in the Z-axis direction. Δ Z is calculated, and the current Z-axis offset value Z2 = Z1 + ΔZ is recorded. At this point, Z2 is the sum of the accumulated values. This process continues until all coordinate movements of the target cross-section of the grinding wheel are completed, and the accumulated Z-axis offset value of the measured surface is recorded. F The maximum Z value obtained by summing the values ​​is used as the initial tool setting point position of the grinding wheel. Since the coordinates of the initial tool setting point X are known, the position of the initial tool setting point can be obtained by finding the value in the Z direction.

[0010] Step S4: Based on the initial tool setting point position, set the depth of cut and complete the grinding wheel dressing.

[0011] Furthermore, in step S4 above, the grinding wheel is dressed according to the corrected route around the figure 8.

[0012] Furthermore, in step S2 above, the center position of the roller is first measured and obtained during machine tool calibration, then the tool setting environment is set, and the grinding wheel swing axis is adjusted to place the grinding wheel in a vertical state; then, in the X-axis direction, the grinding wheel is driven to the center position of the roller so that the grinding wheel and the roller are aligned in the Z-axis direction.

[0013] Furthermore, in step S2 above, the grinding wheel and the roller are 1 mm apart in the Z-axis direction.

[0014] Furthermore, in step S3 above, the AE sensor detects whether the grinding wheel and the roller are in contact.

[0015] Furthermore, the aforementioned system for tool setting during the initial use of a conical grinding wheel includes the following modules:

[0016] The data input and preprocessing module is used to input hob structure parameters, grinding wheel parameters, and roller parameters for preprocessing to obtain the target profile.

[0017] The position detection module obtains the roller center coordinates during machine tool calibration, aligning the grinding wheel with the roller centerline.

[0018] The grinding parameter storage module uses an AE sensor to detect whether the grinding wheel is in contact with the roller. It adopts a new point-by-point feed method to dress the grinding wheel. After the grinding wheel moves one revolution, it obtains the offset data in the Z direction, finds the initial tool setting point, and stores it.

[0019] The signal data execution module sets the depth of cut based on the initial tool setting point position and completes the grinding wheel dressing process.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Many non-standard gears are commonly used in the market. The inconsistent left and right dressing profiles of these gears result in different left and right side edges of the hob, leading to inconsistent left and right cross-sections of the grinding wheel. According to the point-by-point feed method proposed in this invention, the grinding wheel does not need to repeatedly return to its initial position during the measurement process. Simultaneously, the cumulative value of the grinding wheel relative to the Z-axis of the hob is recorded. By comparing the accumulated results, the initial tool setting point of the grinding wheel can be determined. Therefore, during grinding wheel dressing, only one cycle of grinding wheel movement is needed to determine the tool setting position, improving the dressing efficiency of the grinding wheel.

[0022] 2. By adopting the point-to-point tooling method proposed in this invention, combined with an AE sensor, the initial tool setting point for grinding wheel dressing can be found quickly and accurately, solving the problem of low efficiency in finding the initial tool setting point.

[0023] 3. This invention has a wide range of applications: it is suitable for the initial dressing of new grinding wheels with different tapers, and also for dressing and tool setting when grinding wheels with different profiles are reused. Attached Figure Description

[0024] Figure 1 This is a flowchart of the method of the present invention.

[0025] Figure 2 This is a schematic diagram of the initial state of the grinding wheel provided in an embodiment of the present invention, wherein (a) is the first point of movement of the grinding wheel of the present invention; and (b) is the initial tool setting point of the grinding wheel.

[0026] Figure 3 This is a schematic diagram of a commonly used tool entry method. Detailed Implementation

[0027] The present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments.

[0028] See Figure 1 The present invention provides a method for setting a conical grinding wheel for initial use, which specifically includes the following steps:

[0029] Step S1: Obtain the profile of the target grinding wheel:

[0030] By inputting the grinding wheel, hob structure, and roller parameters into a CNC machine tool, the coordinates of the target grinding wheel profile are obtained.

[0031] Step S2: Align the moving grinding wheel with the center line of the roller:

[0032] like Figure 2In the coordinate system, the axes of movement include the X-axis and Z-axis. The inner curve from A to B to C to D represents the theoretical cross-section of the grinding wheel (green curve), while the outer irregular curve represents the actual cross-section of the grinding wheel. First, the center position of the roller is measured and obtained during CNC machine tool calibration. Next, the tool setting environment is set, and the grinding wheel oscillation axis is adjusted to place the grinding wheel in a vertical position. The grinding wheel axis and roller axis are started, and the cooling is turned off. Then, in the X-axis direction, the grinding wheel is driven to the center position of the diamond roller, so that the two coincide on the X-axis. The grinding wheel and diamond roller are aligned in the Z-axis direction, with the grinding wheel 1mm away from the roller apex. This position of the grinding wheel is the initial position. The grinding wheel is then moved to align with the centerline of the fixed roller.

[0033] The current position is set as the initial position;

[0034] Step S3: Move the grinding wheel according to the known target profile and obtain the movement value to determine the initial tool setting point:

[0035] After the grinding wheel reaches its initial position on the surface being measured, it moves according to the known target profile coordinates, using a point-by-point feed method. When the grinding wheel contacts the roller, it moves away from the roller in the Z-axis direction, and the current Z-axis offset value Z1 is recorded. The movement continues to the next profile coordinate point. If the roller contacts the grinding wheel again, the grinding wheel continues to move away from the roller in the Z-axis direction. Δ Z is calculated, and the current Z-axis offset value Z2 = Z1 + ΔZ is recorded. At this point, Z2 is the sum of the accumulated values. This process continues until all coordinate movements of the target cross-section of the grinding wheel are completed, and the accumulated Z-axis offset value of the measured surface is recorded. F The maximum Z value obtained by summing the values ​​is used as the initial tool setting point position of the grinding wheel. Since the coordinates of the initial tool setting point X are known, the position of the initial tool setting point can be obtained by finding the value in the Z direction.

[0036] For further detailed description, see Figure 2 The conical grinding wheel moves to the initial position of the surface being measured. Based on the already obtained target grinding wheel profile coordinates, the tool setting point position is accurately obtained from the direction of A to B and C to D using the point-by-point infeed method.

[0037] Specifically: move the grinding wheel from its initial position, such as... Figure 2 In this embodiment, from A to B, and from C to D, the grinding wheel is first moved to half the centerline of the roller plus half the maximum width of the grinding wheel. In the section from C to D, specifically at point C where the grinding wheel contacts the roller, the grinding wheel is moved according to known cross-sectional coordinates. An AE sensor detects whether the grinding wheel and roller are in contact. See also... Figure 2(a) shows the initial position of the grinding wheel in this method. The movement of the grinding wheel starts from this point. After one revolution, the initial tool setting point is found. See position (b). The grinding wheel moves from the near roller to the far roller. When the grinding wheel touches the roller, it moves one revolution away from the roller along the Z-axis. Δ Z i The next point is also when the grinding wheel touches the roller, and then moves away from the roller. At this point, we can obtain... Δ Z i+1 ,(in Δ Z i =|Z i碰 -Z i截型 |,ΔZ i+1 =|Z i+1碰 -Z i+1截型 |+ΔZ i Z i碰 : The coordinates of the i-th Z-point where the grinding wheel collides with the roller; Z i截型 (Coordinates of the Z-point of the i-th section) Complete all coordinates of the grinding wheel from section C to section D, and record the offset value Z of the right-hand Z-axis. RF Then, the same method was used to trim the section from A to B, resulting in the left Z-axis offset value Z. LF , will record Z RF and Z LF All values ​​are compared, and the largest value is the position of the initial tool setting point. Figure 2 The position of (b) in the middle.

[0038] Commonly used cutting techniques, see [link / reference] Figure 3 Starting from the initial position, the grinding wheel moves in a figure-eight pattern, completing one revolution. If the grinding wheel and roller do not make contact, the grinding wheel moves closer to the roller. The grinding wheel continues to move in a figure-eight pattern until it finds the correct position. Figure 2 In (b), the initial tool setting point is where the grinding wheel moves closer and closer to the roller.

[0039] In this invention, the point-to-point feed method, compared to commonly used feed methods, does not require returning to the initial position. That is, when the grinding wheel encounters the roller, the grinding wheel moves away from the roller in the Z direction. Δ Z i .

[0040] During the grinding wheel dressing process, the tool setting sensor used to measure whether the grinding wheel is in contact with the roller is an acoustic emission (AE) sensor. The AE sensor is mounted on the roller's rotating shaft. During tool setting, both the roller and the grinding wheel rotate. Then, the CNC system drives the grinding wheel to approach the roller. When it approaches the roller, the AE sensor detects the AE signal.

[0041] Step S4: Based on the initial tool setting point, set the depth of cut to complete the grinding wheel dressing. There are two methods for grinding wheel dressing: figure-eight dressing and sequential dressing. In this embodiment, the grinding wheel dressing method used is a figure-eight dressing method. After passing through this correction route, the grinding wheel dressing will be completed to obtain the target grinding wheel profile.

[0042] The system for implementing the tool setting method for the initial use of the aforementioned conical grinding wheel includes the following modules:

[0043] The data input and preprocessing module is used to input hob structure parameters, grinding wheel parameters, and roller parameters for preprocessing to obtain the target profile.

[0044] The position detection module obtains the roller center coordinates during machine tool calibration, aligning the grinding wheel with the roller centerline.

[0045] The grinding parameter storage module uses an AE sensor to detect whether the grinding wheel is in contact with the roller. It adopts a new point-by-point feed method to dress the grinding wheel. After the grinding wheel moves one revolution, it obtains the offset data in the Z direction, finds the initial tool setting point, and stores it.

[0046] The signal data execution module sets the depth of cut based on the initial tool setting point position and completes the grinding wheel dressing process.

[0047] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for setting up a conical grinding wheel for initial use, characterized in that: Includes the following steps: Step S1: Obtain the target profile of the grinding wheel; Step S2: First, measure and obtain the center position of the roller in the CNC machine tool calibration. The center position of the roller is measured and obtained in the machine tool calibration. Next, set the tool setting environment, adjust the grinding wheel swing axis to make the grinding wheel in a vertical state, start the grinding wheel axis and the roller axis and turn off the cooling. Then, in the X-axis direction, drive the grinding wheel to the center position of the diamond roller so that the two coincide on the X-axis. The grinding wheel and the diamond roller are aligned in the Z-axis direction. The grinding wheel is 1mm away from the roller apex. At this time, the position of the grinding wheel is the initial position, that is, move the grinding wheel to align with the center line of the fixed roller. Step S3: Move the grinding wheel according to the known target profile and obtain the movement value to determine the initial tool setting point. The specific process is as follows: After the grinding wheel reaches its initial position on the surface being measured, it moves according to the known target profile coordinates, using a point-by-point feed method. When the grinding wheel contacts the roller, it moves away from the roller in the Z-axis direction, and the current Z-axis offset value Z1 is recorded. The movement continues to the next profile coordinate point. If the roller contacts the grinding wheel again, the grinding wheel continues to move away from the roller in the Z-axis direction. And record the current Z-axis offset value Z2=Z1+ , Let Z be the coordinate of the Z-point where the grinding wheel collides with the roller. Z2 is the sum of the accumulated values ​​until all coordinate movements of the cross-section of the measured surface of the grinding wheel are completed. Record the accumulated offset value Z along the Z-axis of the measured surface. F The maximum Z value obtained by summing the values ​​is used as the initial tool setting point position of the grinding wheel. Since the coordinates of the initial tool setting point X are known, the position of the initial tool setting point can be obtained by finding the value in the Z direction. Step S4: Based on the initial tool setting point position, set the depth of cut and complete the grinding wheel dressing.

2. The method for setting the tool when using a conical grinding wheel for the first time according to claim 1, characterized in that... In step S4, the grinding wheel is overhauled according to the corrected route around the figure 8.

3. The method for setting a conical grinding wheel for initial use according to claim 2, characterized in that: In step S2 above, the grinding wheel and the roller are 1 mm apart in the Z-axis direction.

4. The method for setting a conical grinding wheel for initial use according to claim 3, characterized in that: In step S3, the AE sensor is used to detect whether the grinding wheel and the roller are in contact.

5. The system for setting tools for the initial use of a conical grinding wheel according to claim 1, characterized in that: Includes the following modules: The data input and preprocessing module is used to input hob structure parameters, grinding wheel parameters, and roller parameters for preprocessing to obtain the target profile. The position detection module obtains the roller center coordinates during machine tool calibration, aligning the grinding wheel with the roller centerline. The grinding parameter storage module uses an AE sensor to detect whether the grinding wheel is in contact with the roller. It adopts a new point-by-point feed method to dress the grinding wheel. After the grinding wheel moves one revolution, it obtains the offset data in the Z direction, finds the initial tool setting point, and stores it. The signal data execution module sets the depth of cut based on the initial tool setting point position and completes the grinding wheel dressing process.

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