Grinding process and positioning mold for reducing stress difference of workpiece surface

Abstract

The application relates to the field of workpiece surface processing, in particular to a grinding process for reducing the stress difference of a workpiece surface, which specifically comprises the following steps: a grinding tool grinds the surface of a workpiece A; the workpiece A is turned over and lifted by a grinding height; the grinding tool grinds the surface of the workpiece A after being turned over, so that the surface stress of the workpiece during grinding of the two opposite surfaces is relatively consistent, the stress between the two grinding surfaces of the workpiece is more consistent, and the quality of the two grinding surfaces of the workpiece is close.

Description

Technical Field

[0001] This application relates to the field of workpiece surface processing, and in particular to a grinding process and positioning mold for reducing stress difference on workpiece surfaces. Background Technology

[0002] The two largest surfaces of the flat, elongated ceramic workpiece blank are relatively rough. In order to obtain a smoother surface, it is necessary to use an abrasive tool, such as a grinding wheel, to grind the workpiece surface. That is, after the workpiece is positioned on the worktable, the abrasive tool is moved down to a certain height by a power source such as a hydraulic cylinder to grind the workpiece surface.

[0003] Currently, the grinding process involves first grinding all workpiece blanks on one side, and after grinding one surface of each workpiece blank, a mark is made on the ground surface using a marker to prevent repeated grinding. After all workpiece blanks have completed single-sided machining, the remaining surface of all workpiece blanks is then ground.

[0004] Regarding the aforementioned technologies, after all workpiece blanks have undergone single-sided grinding, the grinding wheel experiences significant wear, resulting in a decrease in sharpness. When the grinding wheel with reduced sharpness grinds another surface of the workpiece blank, the stress applied by the grinding wheel to the workpiece blank will increase, leading to a reduction in the surface smoothness of the workpiece blank after grinding. This results in a difference in the surface quality of the two ground surfaces of the same workpiece blank. Summary of the Invention

[0005] In order to reduce the quality difference between the two surfaces of the workpiece blank during grinding, this application provides a grinding process and positioning mold to reduce the stress difference on the workpiece surface.

[0006] Firstly, the grinding process for reducing surface stress difference of a workpiece provided in this application adopts the following technical solution.

[0007] A grinding process for reducing stress difference on the surface of a workpiece includes the following steps.

[0008] Step 1: The grinding wheel grinds the surface of workpiece A;

[0009] Step 2: Flip over workpiece A and raise it by one grinding height;

[0010] Step 3: Grind the surface of workpiece A after it has been flipped.

[0011] By adopting the above technical solution, the stress from the grinding wheel on the two grinding surfaces of the workpiece blank is more consistent, reducing the difference in smoothness between the two grinding surfaces of the workpiece blank, and making the quality of the two grinding surfaces of the workpiece blank more consistent.

[0012] Optionally, the grinding height in step 2 is the surface grinding amount before workpiece A is turned over. The grinding height in step 2 is calculated by taking the average value of the surface grinding amounts measured after multiple workpieces A have been ground under the same grinding wheel.

[0013] By adopting the above technical solution, when the grinding wheel is lowered to the same height, the distance between the surface of workpiece A and the center point of the grinding wheel is equal each time it is ground. This makes the stress applied by the grinding wheel to the two grinding surfaces of workpiece A the same, so that workpiece A is less likely to bend or have quality differences between the two grinding surfaces. Furthermore, it makes the grinding height more accurate, so as to further reduce the surface quality difference between the two grinding surfaces of workpiece A after raising the grinding height by one.

[0014] Optionally, the position where workpiece A is placed before flipping over is the low position area, and the position where workpiece A is placed after flipping over is the high position area. The height of the high position area is higher than that of the low position area by a grinding height. In step 2, while workpiece A is flipped over and placed in the high position area, workpiece B is placed in the low position area. In step 3, workpiece A and workpiece B are ground simultaneously.

[0015] By adopting the above technical solution, workpiece A and workpiece B are ground simultaneously, which speeds up the processing efficiency of the entire batch of workpiece blanks.

[0016] Optionally, the grinding wheel reciprocates relative to workpiece A and workpiece B along the width direction of the workpiece blank, and moves relative to workpiece A and workpiece B along the length direction of the workpiece blank.

[0017] By adopting the above technical solution, the surfaces of workpieces A and B can achieve relatively uniform grinding.

[0018] Optionally, workpiece A and workpiece B remain stationary along the width direction of the workpiece blank, and the minimum range in which the lowest point of the grinding tool reciprocates along the width direction of the workpiece blank is the area between the two sides of workpiece A and workpiece B that are far apart in the two length directions.

[0019] Workpiece A and workpiece B remain stationary along the length of the workpiece blank. The minimum range in which the lowest point of the grinding wheel moves along the length of the workpiece blank is the area between the two ends of workpiece A and workpiece B that are furthest apart along the length direction.

[0020] By adopting the above technical solution, workpieces A and B will not move after placement, and different workpieces A and B are less likely to have positional deviations when placed, so that different workpieces A and B can be fully ground.

[0021] Optionally, workpiece A and workpiece B are a batch of several workpiece blanks arranged side by side along the width direction of the workpiece blank.

[0022] By adopting the above technical solution, the processing efficiency of workpiece blanks is improved, and the surface grinding quality of several workpiece blanks in the same batch of workpiece A or workpiece B is less likely to have significant differences.

[0023] Secondly, the positioning mold provided in this application adopts the following technical solution.

[0024] A positioning mold, used in accordance with the above-mentioned grinding process for reducing the stress difference on the surface of a workpiece, includes a rear plate for inward forming of a high-position area and a front plate for inward forming of a low-position area. Negative pressure grooves for negative pressure adsorption of the workpiece blank are formed in both the high-position area and the low-position area. The rear plate and the front plate can rotate relative to each other so that the high-position area and the low-position area can approach and align.

[0025] By adopting the above technical solution, the workpiece blank is fixed in position during grinding using negative pressure adsorption, so that the workpiece blank can be unfixed and refixed when flipping over. Moreover, when flipping over the workpiece blank, it is not necessary to move it from the low position area one by one and then flip it over to place it in the high position area, which speeds up the overall flipping of workpiece A and improves grinding efficiency.

[0026] Optionally, the rear plate is fixed in position while the front plate can rotate. The rear plate is connected to a rear plate valve that controls all the negative pressure slots of the rear plate to form a negative pressure environment, and the front plate is connected to a front plate valve that controls all the negative pressure slots of the front plate to form a negative pressure environment.

[0027] Before the front panel flips towards the high position area, close the rear panel valve. After the front panel flips, close the front panel valve and simultaneously open the rear panel valve, then flip the front panel back to its original position.

[0028] By adopting the above technical solution, the front plate flips, allowing the workpiece blank to fall to the high position area under its own gravity. Compared with the rear plate flipping, which relies on the negative pressure groove in the high position area to attract and move the workpiece blank upward, the workpiece blank can be more stably fixed in the high position area. Before the front plate flips, the negative pressure groove in the high position area is made free of suction force to avoid the negative pressure groove in the high position area not easily attracting the nearby workpiece blank when the front plate is unstable during the flipping process. This makes it difficult for the workpiece blank to fall before the front plate is stable, allowing the workpiece blank to be fixed in a stable position in the high position area according to the predetermined position. Moreover, after the front plate completes the flipping and stabilization, the suction force of the negative pressure groove in the low position area gradually decreases while the suction force of the negative pressure groove in the high position area gradually increases, allowing the workpiece blank to fall stably in the high position area. This reduces the likelihood of the workpiece blank bouncing and causing positional displacement, and also reduces the impact force between the workpiece blank and the high position area.

[0029] Optionally, the rear plate is fixedly connected to a plate base for the side of the front plate away from the low position area to abut against. The side of the plate base facing the front plate has a fixed plate suction port that can form a negative pressure environment so that the front plate is tightly attached to the plate base. The plate base is connected to a base valve that controls the formation of a negative pressure environment by the fixed plate suction port.

[0030] By adopting the above technical solution, when the workpiece blank in the low position area is being ground, the front plate is less likely to wobble slightly due to the grinding stress applied to the workpiece blank by the grinding wheel. This makes the grinding stress borne by the workpiece blank in the low position area more consistent throughout the grinding process, and makes it less likely for the quality of the two grinding surfaces of the workpiece blank to differ.

[0031] In summary, this application includes at least one of the following beneficial effects:

[0032] 1. The two grinding surfaces of the workpiece blank are subjected to more consistent stress from the grinding wheel during grinding, which reduces the difference in smoothness between the two grinding surfaces of the workpiece blank, and makes the quality of the two grinding surfaces of the workpiece blank more consistent.

[0033] 2. Workpiece A and workpiece B are ground simultaneously to speed up the processing efficiency of the entire batch of workpiece blanks. Attached Figure Description

[0034] Figure 1 This is a flowchart of a grinding process for reducing surface stress difference of a workpiece according to this application;

[0035] Figure 2 This is a structural schematic diagram of a positioning mold in this application;

[0036] Figure 3 This is a schematic diagram of the structure on the upper surface of the plate base.

[0037] Explanation of reference numerals in the attached diagram: 1. Low position area; 2. High position area; 3. Rear plate; 4. Front plate; 5. Negative pressure groove; 51. Rear plate valve; 52. Front plate valve; 53. Plate base; 54. Fixed plate suction port; 55. Base valve. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the accompanying drawings.

[0039] This application discloses a grinding process for reducing stress difference on the surface of a workpiece, referring to... Figure 1 Specifically, it includes the following steps.

[0040] Step 1: The grinding wheel grinds the surface of workpiece A. Workpiece A can be composed of several workpiece blanks in a batch. The workpiece blanks in the same batch are aligned along their width direction, and the sides of two adjacent workpiece blanks in the same batch are in close contact along their length direction. In this embodiment, workpiece A can be composed of three workpiece blanks. A low-position area 1 can be formed on a flat surface such as a worktable or a corresponding mold. A batch of workpiece blanks of workpiece A can be placed vertically in the low-position area 1, and workpiece A cannot move freely in the horizontal plane within the low-position area 1.

[0041] During grinding, the grinding wheel moves from one end to the other along the length of the workpiece blank, and at the same time, the grinding wheel also reciprocates along the width of the workpiece blank.

[0042] Step 2: Flip over workpiece A and raise it by one grinding height. Specifically, a high-level area 2 is formed on a flat surface such as a worktable or mold with a low-level area 1. High-level area 2 allows workpiece A, with one side to be ground, to be placed vertically, with the ground surface of workpiece A facing down. Workpiece A cannot move freely in the horizontal plane within high-level area 2. The bottom height of high-level area 2 is higher than the bottom height of low-level area 1 by one grinding height. The grinding height is the surface grinding amount after grinding one surface of the workpiece blank. To obtain a more precise grinding height, several workpiece blanks can be ground on one surface using the same grinding wheel. The surface grinding amount of all workpiece blanks is then measured and the average value is taken to calculate the grinding height.

[0043] After placing the flipped workpiece A into the high position area 2, place the next set of workpieces B, which will be ground on both sides, into the low position area 1. Workpieces B and A are made of the same material and have the same dimensions.

[0044] Step 3: The grinding wheel grinds workpiece A and workpiece B simultaneously. The minimum range of the reciprocating movement of the lowest point of the grinding wheel along the width direction of the workpiece blank is the area between the two sides of workpiece A and workpiece B that are far apart in the two length directions. The minimum range of the movement of the lowest point of the grinding wheel along the length direction of the workpiece blank is the area between the two ends of the length direction that are far apart from workpiece A and workpiece B.

[0045] The principle of a grinding process for reducing stress difference on the surface of a workpiece according to an embodiment of this application is as follows: after one side of a batch of workpiece blanks is ground in the low-position zone 1, it is flipped over and placed in the high-position zone 2 for grinding the other side. This makes the stress from the grinding wheel on the two grinding surfaces of the workpiece blanks more consistent, so that the two grinding surfaces of the same batch of workpiece blanks are less likely to have large differences in quality.

[0046] This application also discloses a positioning mold, as shown in the embodiments. Figure 2The system includes a front plate 4 for forming a concave shape in the lower region 1 and a rear plate 3 for forming a concave shape in the higher region 2. Both the lower region 1 and the higher region 2 have relatively small depths. Negative pressure grooves 5 are formed on the concave bottom surfaces of both the lower region 1 and the higher region 2. Several negative pressure grooves 5 in either the lower region 1 or the higher region 2 are provided corresponding to all workpiece blanks in workpiece A or workpiece B. In this embodiment, three negative pressure grooves 5 are provided in either the lower region 1 or the higher region 2. A front plate valve 52 is detachably connected to and communicates with the vertical side of the front plate 4, and a rear plate valve 51 is detachably connected to and communicates with the vertical side of the rear plate 3. Both the front plate valve 52 and the rear plate valve 51 can be connected to an external vacuum pump via flexible hoses. The front plate valve 52 controls the negative pressure grooves 5 of the front plate 4 to adsorb or release the workpiece blanks, and the rear plate valve 51 controls the negative pressure grooves 5 of the rear plate 3 to adsorb or release the workpiece blanks.

[0047] Reference Figure 2 The rear plate 3 can be fixed to the corresponding horizontal surface of the worktable by magnetic attraction of an electromagnet. The rear plate 3 is hinged to the front plate 4 and the direction of rotation axis is consistent with the length direction of the rear plate 3 and the front plate 4. After the workpiece blank on the front plate 4 has completed one side grinding, the front plate 4 flips so that the workpiece blank that has completed one side grinding flips to the top of the rear plate 3. At this time, there is a slight gap between the bottom surface of the workpiece blank that has been ground on one side and the bottom surface of the high position area 2.

[0048] Furthermore, before the front plate 4 flips towards the high-position zone 2, the rear plate valve 51 is closed. This prevents the high-position zone 2 from exerting a strong suction force on the workpiece blank while the front plate 4 is still unstable during the flipping process, thus preventing the workpiece blank from falling off. After the front plate 4 has finished flipping, the front plate valve 52 is closed while the rear plate valve 51 is opened simultaneously. Then, the front plate 4 is flipped back to its original position, allowing the workpiece blank to fall stably onto the high-position zone 2 under its own weight and the suction force of the negative pressure groove 5 in the high-position zone 2. This effectively maintains the position of the workpiece blank in the high-position zone 2, preventing deviations. Both the front plate valve 52 and the rear plate valve 51 can be solenoid valves, allowing for stable control via an external controller to close the front plate valve 52 while simultaneously opening the rear plate valve 51.

[0049] Reference Figure 2 and Figure 3 The rear plate 3 is fixedly connected to a plate base 53 located directly below the horizontal front plate 4. A fixed plate suction port 54 is provided on the upper surface of the plate base 53. The vertical side of the plate base 53 is detachably connected to and connected to a base valve 55. The base valve 55 is connected to an external vacuum pump. The base valve 55 can control the fixed plate suction port 54 to form a negative pressure environment so that the fixed plate suction port 54 can adsorb the front plate 4 tightly against the plate base 53, so that the front plate 4 is not easy to shake when the grinding wheel grinds the workpiece blank on the low position area 1.

[0050] In other embodiments of this example, at least three distance sensors are provided on the upper surface of the plate base 53. In this example, there are three distance sensors arranged in a triangle. The distance sensors detect the distance between the point on the plate base 53 where they are located and the bottom surface of the front plate 4 and output a signal to the external controller. When the distance values ​​detected by the three distance sensors are inconsistent or the distance values ​​are less than the preset distance values ​​in the external controller, it indicates that the front plate 4 has not rotated to a state where it is close enough to the plate base 53 to be stably adsorbed by the fixed plate suction port 54. The external controller controls the corresponding sound and light alarm to sound an alarm to the staff to ensure that the front plate 4 can be stably adsorbed by the fixed plate suction port 54 before rotation.

[0051] The principle of a positioning mold in this application embodiment is as follows: the front plate 4 can be directly flipped to transfer the workpiece blank that has been ground on one side to the high position area 2 of the rear plate 3, thereby speeding up the efficiency of transferring the workpiece blank. After the front plate 4 is flipped, the fixed plate suction port 54 can adsorb and fix the front plate 4, so that the front plate 4 is not easy to shake during grinding, thereby reducing the impact on the grinding quality of the workpiece blank.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grinding process for reducing stress difference on the surface of a workpiece, characterized in that: Specifically, the steps include the following: Step 1: The grinding wheel grinds the surface of workpiece A; Step 2: Flip over workpiece A and raise it by one grinding height; Step 3: Grind the surface of workpiece A after it has been flipped using a grinding wheel; The grinding height in step 2 is the surface grinding amount before workpiece A is turned over. The grinding height in step 2 is calculated by taking the average value of the surface grinding amounts measured after grinding multiple workpieces A under the same grinding wheel. The position of the workpiece A before flipping it over is the low position area (1), and the position of the workpiece A after flipping it over is the high position area (2). The height of the high position area (2) is higher than that of the low position area (1) by a grinding height. In step 2, while the workpiece A is flipped over and placed in the high position area (2), the workpiece B is placed in the low position area (1). In step 3, the workpiece A and the workpiece B are ground synchronously.

2. The grinding process for reducing surface stress difference of a workpiece according to claim 1, characterized in that: The grinding wheel reciprocates relative to workpieces A and B along the width direction of the workpiece blank, and moves relative to workpieces A and B along the length direction of the workpiece blank.

3. The grinding process for reducing surface stress difference of a workpiece according to claim 2, characterized in that: Workpieces A and B remain stationary along the width direction of the workpiece blank. The minimum range in which the lowest point of the grinding tool reciprocates along the width direction of the workpiece blank is the area between the two sides of workpieces A and B that are far apart in the two length directions. Workpiece A and workpiece B remain stationary along the length of the workpiece blank. The minimum range in which the lowest point of the grinding wheel moves along the length of the workpiece blank is the area between the two ends of workpiece A and workpiece B that are furthest apart along the length direction.

4. The grinding process for reducing surface stress difference of a workpiece according to claim 1, characterized in that: Both workpiece A and workpiece B are a batch of several workpiece blanks arranged side by side along the width direction of the workpiece blank.

5. A positioning mold, used in accordance with a grinding process for reducing surface stress difference of a workpiece as described in claims 1 to 4, characterized in that: It includes a rear plate (3) for the high position area (2) to be recessed and a front plate (4) for the low position area (1) to be recessed. Both the high position area (2) and the low position area (1) are formed with negative pressure grooves (5) for negative pressure adsorption of the workpiece blank. The rear plate (3) and the front plate (4) can rotate relative to each other so that the high position area (2) and the low position area (1) can approach and align.

6. A positioning mold according to claim 5, characterized in that: The rear plate (3) is fixed in position and the front plate (4) can rotate. The rear plate (3) is connected to a rear plate valve (51) that controls all the negative pressure grooves (5) of the rear plate (3) to form a negative pressure environment. The front plate (4) is connected to a front plate valve (52) that controls all the negative pressure grooves (5) of the front plate (4) to form a negative pressure environment. Before the front plate (4) is flipped toward the high position area (2), the rear plate valve (51) is closed. After the front plate (4) is flipped, the front plate valve (52) is closed and the rear plate valve (51) is opened simultaneously. Then the front plate (4) is flipped back to its original position.

7. A positioning mold according to claim 6, characterized in that: The rear plate (3) is fixedly connected to a plate base (53) for the front plate (4) to abut against the side away from the low position area (1). The plate base (53) has a fixed plate suction port (54) on the side facing the front plate (4) that can form a negative pressure environment so that the front plate (4) is tightly attached to the plate base (53). The plate base (53) is connected to a base valve (55) for controlling the negative pressure environment formed by the fixed plate suction port (54).

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