A device for automatic centering and online measurement compensation of fine grinding allowance

Abstract

The present invention discloses an automatic centering and online measurement and compensation device for fine grinding allowance, comprising a processing table, a fixture and a CPU. A workpiece is clamped on the top of the fixture. A driving seat 1 and a driving seat 2 are provided on the top of the processing table for driving the fixture to translate along mutually perpendicular X-axis and Y-axis directions, respectively. The driving seat 1 and the driving seat 2 are vertically staggered and arranged vertically above and below. When the driving seat 2 is arranged above the driving seat 1, a flip seat for driving the fixture to rotate around the X-axis direction is installed on the top of the driving seat 2. The present invention can realize automatic centering of the allowance of the part to be processed and even distribution of the processing allowance on both sides, avoiding the phenomenon of grinding more on one side and less on the other side, or even not grinding at all. It is combined with multiple fully automated processing modes such as online detection of processed parts, real-time compensation, and corrective grinding.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled grinding machines, in particular to an automatic centering and online measurement compensation device for fine grinding allowance. Background Art

[0002] CNC grinding machines are machine tools that utilize abrasive tools through CNC technology to grind workpiece surfaces. Most grinders use high-speed rotating grinding wheels, while a few utilize other tools such as oilstones and sanding belts, as well as free abrasives. They can process hard materials such as hardened steel and cemented carbide, as well as brittle materials such as glass and granite. Grinding machines are capable of high-precision grinding with minimal surface roughness, as well as high-efficiency grinding, such as high-power grinding.

[0003] During the production process, the measuring tool needs to use a grinder to precisely grind the measuring end face used for measuring the contact object. The accuracy of the grinding process will directly affect the measurement accuracy of the ruler. At present, the existing CNC grinders have poor accuracy when it is required to ensure that both sides of the workpiece grinding part are ground at the same time. The reason is that during the grinding process, the machining allowances on both sides of the grinding workpiece change in real time and are inconsistent, and there is a certain degree of error. If other reference surfaces are used for positioning, the allowance error will always exist, resulting in more machining on one side of the machined surface and less machining on the other side, and sometimes even no machining on one side. For this reason, we provide an automatic centering and online measurement compensation device for fine grinding allowance. Summary of the Invention

[0004] The object of the present invention is to provide an automatic centering and online measurement compensation device for fine grinding allowance to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an automatic centering and online measurement and compensation device for fine grinding allowance, comprising a processing table, a fixture and a CPU, wherein a workpiece is clamped on the top of the fixture, and a driving seat 1 and a driving seat 2 are respectively provided on the top of the processing table for driving the fixture to translate along the X-axis and Y-axis directions perpendicular to each other. The driving seat 1 and the driving seat 2 are arranged vertically alternately up and down. When the driving seat 2 is arranged above the driving seat 1, a flip seat for driving the fixture to rotate around the X-axis direction is installed on the top of the driving seat 2.

[0006] It also includes a grinding component, an automatic centering and positioning component and an online measurement component arranged in parallel on one side of the fixture, the grinding component includes a grinding motor fixed on the top of the processing table, the output end of the grinding motor is equipped with a grinding wheel, the grinding component is used for grinding the processing surface of the workpiece, the automatic centering and positioning component includes a pair of positioning claws moving in opposite directions for detecting the processing surfaces on both sides of the workpiece, the CPU determines the symmetrical distribution of the processing allowances on the processing surfaces on both sides based on the center lines of the positioning claws on both sides, and the online measurement component is used to detect the size of the processing surface of the workpiece.

[0007] Preferably, it also includes a rest component for correcting at least three surfaces of the grinding wheel, the rest component is fixed at the edge position of the top of the fixture close to one side of the grinding component, and the rest component includes a rest frame with an open front end and a diamond pen arranged inside the rest frame.

[0008] Preferably, a collecting trough is provided on the top of the processing table, and a chip discharge port is provided on one side of the outer side wall of the protective frame.

[0009] Preferably, support legs are installed at the corner positions of the bottom of the processing table, and adjustment bolts for height adjustment are provided between the tops of the support legs and the processing table.

[0010] Preferably, the top of the clamp is provided with a clamping cylinder and at least two limit columns for horizontally fixing the workpiece, the output end of the clamping cylinder is arranged opposite to the side of the limit column and is provided with a limit plate, the clamp is installed with an induction switch, and the clamp is installed with several floating chucks for vertically fixing the workpiece.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the automatic centering of the fine grinding allowance and the online measurement compensation device can realize the automatic centering of the allowance of the parts to be processed, and the method adopted is to realize the symmetrical distribution of the processing allowance by positioning the processing surface of the processing parts. Each positioning is grasped on a fixed center line, and the CNC system can locate the processing center line of the grinding workpiece according to the center line of the positioning claw, thereby realizing the uniform distribution of the processing allowance on both sides, avoiding the phenomenon of grinding more on one side and less on the other side, or even not grinding at all. Furthermore, the processing parts are detected online and compensated in real time. Through the integrated application of the online detection component and the CNC system, it is realized The real-time quality inspection process of parts is carried out while they are being processed, and the parts are fed back to the CNC system based on the inspection results to make actual corrections to the machining allowance and machining accuracy of the parts, reduce the number of defective parts, improve the machining accuracy, beat and pass rate of the parts, etc. Furthermore, it can correct multiple fully automated machining modes such as grinding, and enable the grinding wheel to obtain better machining performance. The two end faces of the grinding wheel are the machining surfaces of the grinding wheel and need to be corrected regularly. The correction of the outer cylindrical surface of the grinding wheel is to balance the quality of the grinding wheel, reduce the quality imbalance problem of the grinding wheel during high-speed selection, make it more dynamically balanced, and thus improve the stability of the grinding wheel machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0014] Figure 3 This is a schematic diagram of an enlarged top view of the clamp of the present invention;

[0015] Figure 4 Schematic diagram of the workpiece and its processing parts according to the present invention.

[0016] In the figure: 1. Drive seat 1; 2. Flip seat; 3. Drive seat 2; 4. Rest frame; 5. Grinding assembly; 6. Workpiece; 7. Automatic centering and positioning assembly; 8. Processing table; 9. Online measurement assembly; 10. Support foot; 11. Adjusting bolt; 12. Clamp; 13. Collection trough; 14. Chip discharge port; 15. Clamping cylinder; 16. Limit column; 17. Floating chuck; 18. Diamond pen. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figure 1-4 The present invention provides an embodiment: a device for automatic centering and online measurement compensation of fine grinding allowance, comprising a processing table 8, a fixture 12 and a CPU. The top of the fixture 12 is clamped with a workpiece 6. The top of the processing table 8 is provided with a collecting trough 13, and one side of the outer wall of the protective frame is provided with a chip discharge port 14. In this embodiment, a caliper body is used as the fine grinding object, and the grinding part is as follows. Figure 4 The machining surfaces on both sides shown in the figure require that the grinding thickness of the machining surfaces on both sides be consistent to ensure that the grinding parts are symmetrical on both sides.

[0019] In CNC grinding, since CNC requires that the workpiece 6 can be programmed to move relative to the machining head in space during the machining process, or the machining head can be programmed to move relative to the workpiece 6 in space, so as to realize CNC motion machining of the machining area of ​​the workpiece 6, this embodiment adopts programming to control the movement of the workpiece 6 relative to the machining head for CNC grinding. Specifically, the top of the machining table 8 is respectively provided with a drive seat 1 and a drive seat 2 3 for driving the fixture 12 to move horizontally along the X-axis and Y-axis directions perpendicular to each other. The drive seat 1 and the drive seat 2 3 are used to generate the movement of the fixture 12 in two perpendicular directions. The drive seat 1 and the drive seat 2 3 are arranged vertically staggered up and down, so the drive seat 1 and the drive seat 2 3 are arranged superimposed on each other, such as Figure 1-2 As shown, this embodiment adopts a method in which the driving seat 2 3 is arranged above the driving seat 1, and at this time, a flip seat 2 for driving the fixture 12 to rotate around the X-axis direction is installed on the top of the driving seat 2 3. The flip seat 2 also includes a servo motor at the tail that provides flipping power and a rotating shaft at the front end. The rotating shaft is connected to the fixture 12. During movement, the driving seat 1 drives the driving seat 2 3 to move in the X direction, and the driving seat 2 3 drives the flip seat 2 to move in the Y direction, and the movements in the X and Y directions do not interfere with each other. The flip seat 2 drives the workpiece 6 to flip and rotate. The rotation direction can be called rotation in the Z-axis direction. The Z-axis is the direction of rotation parallel to the center line of the X-axis, so as to facilitate spatial three-dimensional processing of the workpiece 6.

[0020] It also includes a grinding component 5, an automatic centering and positioning component 7 and an online measurement component 9 which are arranged in parallel on one side of the fixture 12.

[0021] The grinding assembly 5 includes a grinding motor fixed to the top of the processing table 8, and a grinding wheel is installed at the output end of the grinding motor 5. The grinding wheel is the above-mentioned processing head. The grinding assembly 5 is used for grinding the processing surface of the workpiece 6. In order to control the dynamic balance and static balance of the grinding wheel, it also includes a rest assembly for correcting at least three surfaces of the grinding wheel. The rest assembly is fixed at the edge position of the top of the fixture 12 close to one side of the grinding assembly 5. The rest assembly includes a rest frame 4 with an open front end and a diamond pen 18 arranged inside the rest frame 4. By setting a U-shaped rest frame 4 and programming the CNC system, the effect of three-side correction of the grinding wheel is achieved, thereby better controlling the static balance and dynamic balance accuracy of the grinding wheel and achieving better part grinding quality.

[0022] The automatic centering and positioning component can realize automatic centering of the machining allowance of the machined parts, so that the machining allowance on both sides of the parts are consistent, thereby ensuring the machining accuracy, machining rhythm, machining appearance and many other requirements of the parts. Since the machining allowance of the ground workpiece is inconsistent and there is a certain degree of error, if other reference surfaces are used for positioning, the allowance error will always exist, resulting in more machining on one side of the machined surface and less machining on the other side, or sometimes even no machining on one side. Therefore, in this embodiment, the automatic centering and positioning component 7 includes a pair of positioning claws that move towards each other to detect the machining surfaces on both sides of the workpiece 6. During centering and positioning, the positioning claws on both sides move inward to detect the machining surfaces. The positioning claws position the machining surface of the workpiece 6 to achieve a symmetrical distribution of the machining allowance. Each time the positioning claws retract inward about a fixed center line, the CPU determines the symmetrical distribution of the machining allowance on both sides of the machining surface based on the center lines of the positioning claws on both sides. The CPU (CNC system) can locate the center line position of the machining surface of the workpiece 6 according to the center lines of the positioning claws, thereby achieving a uniform distribution of the machining allowance on both sides, thereby avoiding the phenomenon of more grinding on one side and less grinding on the other side, or even no grinding at all.

[0023] The online measurement component 9 is used to detect the machining surface size of the workpiece 6. The online measurement component 9 can be any online measurement device in the existing technology. The main purpose is to realize the integrated application of the online measurement component and the CNC system, realize the actual quality inspection process of parts while being processed and inspected, and feed back the parts inspection results to the CNC system to make actual corrections to the parts' machining allowance and machining accuracy, reduce the number of defective parts, and improve the parts' machining accuracy, beat and pass rate, etc.

[0024] Furthermore, in this embodiment, we adopt automatic clamping of the workpiece 6. The top of the clamp 12 is provided with a clamping cylinder 15 and at least two limit columns 16 for horizontally fixing the workpiece 6. The output end of the clamping cylinder 15 is arranged opposite to the limit column 16 and is provided with a limit plate. The clamp 12 is installed with an induction switch, and the clamp 12 is installed with several floating chucks 17 for vertically fixing the workpiece 6. After the induction switch senses the workpiece in a non-contact manner, the workpiece 6 is positioned and clamped laterally by the clamping cylinder 15 and the limit column 16, and the floating chuck 17 is clamped longitudinally, thereby realizing the precise automatic positioning and clamping function of the parts and eliminating errors and mistakes in manual clamping.

[0025] In order to ensure the levelness of the device during use, the device should have a height adjustment function at the four corner positions to adapt to the actual installation location. Therefore, support feet 10 are installed at the corner positions at the bottom of the processing table 8, and an adjustment bolt 11 for height adjustment is provided between the top of the support foot 10 and the processing table 8.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for automatic centering and online measurement and compensation of fine grinding allowance, characterized in that: The invention comprises a processing table (8), a fixture (12) and a CPU, wherein a workpiece (6) is clamped on the top of the fixture (12), and a driving seat (1) and a driving seat (2) (3) are respectively provided on the top of the processing table (8) for driving the fixture (12) to translate along mutually perpendicular X-axis and Y-axis directions. The driving seat (1) and the driving seat (3) are arranged vertically and staggered up and down. When the driving seat (3) is arranged above the driving seat (1), a flip seat (2) is installed on the top of the driving seat (3) for driving the fixture (12) to rotate around the X-axis direction. The flip seat (2) drives the workpiece (6) to flip and rotate, so as to facilitate the three-dimensional processing of the workpiece (6) in space. The invention also includes a grinding assembly (5), an automatic centering and positioning assembly (7), and an online measurement assembly (9) arranged in parallel on one side of the fixture (12), wherein the grinding assembly (5) includes a grinding motor fixed to the top of the processing table (8), and a grinding wheel is installed at the output end of the grinding motor. The grinding assembly (5) is used for grinding the processing surface of the workpiece (6), and the automatic centering and positioning assembly (7) includes a pair of positioning claws moving in opposite directions for detecting the processing surfaces on both sides of the workpiece (6). The CPU determines the symmetrical distribution of the processing allowances of the processing surfaces on both sides based on the center lines of the positioning claws on both sides. The online measurement assembly (9) is used for detecting the size of the processing surface of the workpiece (6); It also includes a rest assembly for correcting at least three surfaces of the grinding wheel, the rest assembly being fixed to the edge of the top of the fixture (12) close to one side of the grinding assembly (5), and the rest assembly including a rest frame (4) with an open front end and a diamond pen (18) arranged inside the rest frame (4); The top of the clamp (12) is provided with a clamping cylinder (15) and at least two limit columns (16) for horizontally fixing the workpiece (6); the output end of the clamping cylinder (15) is arranged opposite to the side of the limit column (16) and is provided with a limit plate; the clamp (12) is provided with an induction switch, and the clamp (12) is provided with a plurality of floating chucks (17) for vertically fixing the workpiece (6).

2. The automatic centering and online measurement and compensation device for fine grinding allowance according to claim 1, characterized in that: A collecting trough (13) is provided on the top of the processing table (8), and a chip discharge port (14) is provided on one side of the outer side wall of the protective frame.

3. The automatic centering and online measurement and compensation device for fine grinding allowance according to claim 1, characterized in that: Support legs (10) are installed at the corner positions of the bottom of the processing table (8), and adjustment bolts (11) for height adjustment are provided between the tops of the support legs (10) and the processing table (8).

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