Numerical control grinding machine for high-precision metal part machining

Abstract

The application relates to the technical field of numerical control grinding machines, in particular to a numerical control grinding machine for high-precision metal part machining, which comprises a base and a workbench arranged on the base, a horizontal driving assembly for driving the horizontal movement of the workbench is arranged in the base, a clamp assembly is fixedly arranged on the workbench, a vertical column is arranged at the rear side of the base, the vertical column is vertically arranged and fixedly arranged on the base, and a main shaft is arranged at the front end of the vertical column; through the arrangement of a pressing rod, a lever and a plate spring, the pressing rod is moved to the direction close to a magnetic seat under the magnetic force of the magnetic seat, the plate spring is compressed, the elastic force of the plate spring acts on one end of the lever in the mounting groove, the lever and a No.1 hinged seat are converted into the downward pressure of the other end of the lever outside the mounting groove, so that the clamping force of the workpiece to be polished is achieved, the horizontal constraint effect on the workpiece to be polished is guaranteed, and the surface polishing quality of the numerical control grinding machine on the non-magnetic thin plate workpiece is guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of numerical control grinding machines, in particular to a numerical control grinding machine for high-precision metal part machining. BACKGROUND

[0002] As core equipment for high-precision metal machining, numerical control grinding machines are widely used in fields with extreme requirements for part size, shape, position precision and surface quality. The numerical control grinding machine accurately controls the relative movement of the grinding wheel and the workpiece through a computer numerical control system, removes a small amount of material in a grinding manner, and can achieve micron-level or even sub-micron-level machining precision.

[0003] In grinding machining, reliable clamping of the workpiece is a prerequisite for ensuring machining precision. For ferromagnetic materials, electromagnetic chucks have become the mainstream clamping method due to their uniform clamping force, convenient clamping, high efficiency and other advantages. However, when machining thin plate parts made of non-magnetic metal materials such as aluminum alloy, titanium alloy, copper alloy and austenitic stainless steel, electromagnetic chucks cannot be used for effective clamping, which has become a significant technical bottleneck.

[0004] To solve the above problems, a vacuum chuck is generally used as a substitute in the prior art. The vacuum chuck generates negative pressure on the workbench surface and uses atmospheric pressure to press the thin plate workpiece tightly on the surface, thereby achieving clamping of non-magnetic metal workpieces. Although this method solves the clamping problem of non-magnetic materials, it has the following inherent and difficult-to-overcome defects when applied to high-precision grinding: 1. The vacuum chuck exerts an adsorbing force perpendicular to the surface of the workpiece. For thin plate workpieces with poor rigidity, this adsorbing force forms a uniform bending moment. When the thin plate workpiece itself has microscopic unevenness or internal residual stress, the strong adsorbing force will forcibly flatten it, causing the workpiece to deform elastically. The grinding process is carried out in the deformed state of the workpiece. Once the machining is completed and the vacuum is released, the workpiece will rebound to its original state, resulting in complete loss of the geometric precision obtained, especially the flatness and parallelism, which cannot meet the high-precision requirements. 2. The friction provided by the vacuum chuck is the only source of resistance to the horizontal and tangential cutting forces generated during grinding. The friction depends on the adsorbing force and the friction coefficient, and its size is limited and passively constrained. When the grinding force is large or there is vibration, the workpiece is prone to micro or even macro relative sliding with the surface of the chuck. This sliding not only directly leads to workpiece scrap, but also has the risk of impacting and damaging the grinding wheel and the machine tool, making it difficult to ensure the safety and reliability of the machining. 3. The effectiveness of vacuum adsorption depends heavily on the flatness, smoothness and cleanliness of the workpiece adsorption surface. Any scratches, stains, burrs or surface roughness can damage the seal, cause local air leakage, and further cause a decrease in adsorbing force or even adsorption failure. Therefore, when machining blanks or semi-finished products, a reference plane for adsorption is often needed to be pre-processed, increasing the process complexity and cost.

[0005] In summary, the existing numerical control grinding machine using vacuum chuck has three core technical problems of workpiece deformation caused by adsorption force, insufficient horizontal constraint and poor adaptability when machining non-magnetic sheet parts, which seriously restricts the application performance and machining quality of high-precision numerical control grinding machine in this field. Therefore, a high-precision, non-deformation and high-reliability numerical control grinding machine for non-magnetic sheet workpieces is urgently needed. SUMMARY

[0006] The purpose of the present application is to provide a numerical control grinding machine for high-precision metal part machining, to solve the problem that the existing numerical control grinding machine using vacuum chuck has three core technical problems of workpiece deformation caused by adsorption force, insufficient horizontal constraint and poor adaptability when machining non-magnetic sheet parts, which seriously restricts the application performance and machining quality of high-precision numerical control grinding machine in this field.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] A numerical control grinding machine for high-precision metal part machining, comprising a base and a workbench arranged on the base, wherein the base is provided with a horizontal drive assembly for driving the horizontal movement of the workbench, the workbench is fixedly installed with a clamp assembly, the rear side of the base is provided with a vertical column, the vertical column is vertically installed and fixedly installed with the base, the front end of the vertical column is provided with a main shaft, the vertical column is provided with a vertical drive assembly for driving the up-down movement of the main shaft, and the vertical column is provided with a main shaft motor for driving the rotation of the main shaft, the front end of the main shaft is provided with a grinding wheel for grinding, and the axial directions of the main shaft and the grinding wheel are horizontally arranged; specifically, the clamp assembly comprises a mounting bracket, a magnetic seat and two pressure rods, the mounting bracket is fixedly installed on the workbench, the magnetic seat is fixedly installed on the upper end face of the mounting bracket, the pressure rods are slidingly installed on the magnetic seat, the lower end of the pressure rod is provided with a plurality of installation grooves, the installation grooves are evenly arranged along the front-rear direction of the pressure rod, and the installation grooves completely penetrate through the front and rear ends of the pressure rod, a first hinge seat and a second hinge seat are arranged on the front and rear sides of each installation groove, the first hinge seat is arranged on one side wall opposite to the two pressure rods, the second hinge seat is arranged on one side wall opposite to the two pressure rods, a lever is arranged in each installation groove, the levers are hingedly connected with the first hinge seats on both sides of the installation groove, one side of the levers hingedly connected with the first hinge seats extends to the outside of the pressure rod, a leaf spring is arranged in each installation groove, one end of the leaf spring is hingedly connected with the second hinge seat, and the other end of the leaf spring is hingedly connected with one end of the lever in the installation groove, the leaf springs are in the shape of an arc with the opening facing upwards, and the lowest point of the leaf spring extends to 5-10mm below the pressure rod in the relaxed state.

[0009] In the surface grinding process of the non-magnetic thin plate workpiece, the plate to be ground is placed horizontally on the magnetic seat, two pressure rods are placed on the left and right sides of the plate to be ground, and the ends of the plurality of levers extending out of the pressure rods are placed on the upper side of the plate to be ground. The lowest point of the plate spring contacts the upper end surface of the magnetic seat. Since the plate spring is arc-shaped and the lowest point of the plate spring extends to the lower side of the pressure rod by 5-10mm in the relaxed state, the weight of the side of the pressure rod provided with the lever is greater than the side of the pressure rod provided with the second hinge seat. The pressure rod tilts towards the side close to the grinding plate with the point where the plate spring contacts the magnetic seat as the fulcrum. After the magnetic seat is electrified to generate magnetic force, the pressure rod is moved towards the magnetic seat under the action of the magnetic force, the plate spring is compressed, and the compression of the plate spring reaches the maximum until the lower end surface of the pressure rod completely adheres to the upper end surface of the magnetic seat. At this time, the elastic force of the plate spring acts on the end of the lever in the mounting groove to provide an upward thrust to the end of the lever in the mounting groove. Since the lever is hinged with the first hinge seat, the end of the lever in the mounting groove is subjected to an upward thrust, which is converted into a downward pressure of the end of the lever outside the mounting groove through the lever and the first hinge seat, thereby completing the clamping force of the workpiece to be ground. The left and right ends of the plate to be ground are subjected to the clamping force of the plurality of levers, thereby avoiding displacement of the plate to be ground in the horizontal direction due to grinding force during grinding, thereby ensuring the horizontal constraint effect on the plate to be ground and ensuring the surface grinding quality of the numerical control grinding machine for non-magnetic thin plate workpieces.

[0010] Further, when the plurality of levers clamp the plate to be ground, the grinding area of the plate to be ground is not subjected to the force in the vertical direction, thereby avoiding deformation of the grinding area of the plate to be ground due to the force in the vertical direction, elastic deformation of the plate to be ground, and loss of precision when the plate to be ground returns to the free state after grinding, thereby ensuring the surface grinding quality of the numerical control grinding machine for non-magnetic thin plate workpieces.

[0011] Further, after the grinding of the plate to be ground is completed, the power supply to the magnetic seat is disconnected, the magnetic seat loses the magnetic force, the pressure rod loses the magnetic force of the magnetic seat, the elastic force of the plate spring is released, the plate spring returns to the free state, the elastic force of the plate spring applied to the lever gradually decreases, the pressure of the lever applied to the ground workpiece gradually decreases, thereby releasing the clamping of the lever to the ground workpiece, and the rebound effect of the plate spring ensures that the end of the lever extending out of the pressure rod is at the same position height in the unclamped state, thereby facilitating the installation and positioning of the clamped workpiece.

[0012] Preferably, the upper side of the end of the plurality of levers extending out of the pressure rod is provided with a magnetic block, the magnetic block is fixedly connected with the lever, and the magnetic pole of the magnetic block is the same as the magnetic pole direction of the magnetic seat.

[0013] When the magnetic base is powered to generate magnetic force, because the magnetic force block and the magnetic pole direction of the magnetic base are the same, the magnetic force block and the magnetic base will generate mutual attraction magnetic force, the magnetic force action between the magnetic force block and the magnetic base enhances the clamping effect of the lever on the plate to be polished, ensures that the plate to be polished can remain stable during the grinding process, thereby ensuring the surface grinding quality of the numerical control grinding machine on the non-magnetic sheet workpiece.

[0014] Preferably, the lower side of the end of the lever extending out of the pressing rod is provided with a compensation block, the compensation block is fixedly connected with the lever, the lower end surface of the compensation block is a plane, and the compensation block is made of rubber material.

[0015] When the lever clamps the plate to be polished, the lower end surface of the compensation block directly contacts the upper surface of the plate to be polished, because the compensation block is made of rubber material, the compensation block has certain elasticity and flexibility, can well adapt to the micro-unevenness of the surface of the plate to be polished, effectively fills the small gap between the lever and the plate to be polished, and avoids the problem of uneven clamping force caused by local poor contact.

[0016] Further, when the magnetic base is powered to generate magnetic force, the pressing rod gradually moves towards the magnetic base under the magnetic force action of the magnetic base, the plate spring is gradually compressed, the lever extends to the end of the pressing rod, the upper end surface of the plate to be polished is first fitted, the compensation block contacts the plate to be polished, the pressing rod rotates with the position where the compensation block contacts the plate to be polished as the fulcrum, and the pressing rods on both sides are pulled towards the side while approaching the magnetic base, thereby avoiding the problem that the plate to be polished is pushed towards the center and the middle part is arched, thereby causing the problem of loss of precision when the plate to be polished is restored to the free state after polishing, and ensuring the surface grinding quality of the numerical control grinding machine on the non-magnetic sheet workpiece.

[0017] Further, the compensation block can also play a role of buffering and shock absorption. When the grinding force produces vibration during the grinding process, the compensation block can absorb part of the vibration energy, reduce the influence of vibration on the plate to be polished, further ensure the stability of the plate to be polished during the grinding process, and thus improve the surface polishing precision and quality of the non-magnetic thin plate workpiece by the numerical control grinding machine.

[0018] Preferably, the rear side wall of the magnetic seat is provided with an electromagnetic seat, the upper end of the electromagnetic seat is provided with a first inclined surface, the first inclined surface faces the upper rear of the electromagnetic seat, the rear ends of the two pressure rods are both connected with a magnetic block through bolts, the lower end of the magnetic block is provided with a second inclined surface, and the second inclined surface is in sliding connection with the first inclined surface.

[0019] When the magnetic seat is powered to generate magnetic force, the electromagnetic seat is synchronously electrified, the electromagnetic seat and the magnetic block generate mutual attraction magnetic force, and due to the matched arrangement of the first inclined surface and the second inclined surface, the magnetic block moves downward along the first inclined surface under the action of the magnetic force, thereby further enhancing the movement trend of the pressure rod to the magnetic seat, and thus the clamping effect of the lever on the plate to be polished is strengthened, so that the plate to be polished can be more stably fixed on the workbench during the grinding process and will not be displaced or vibrated due to the action of the grinding force, thereby ensuring the surface polishing precision and quality of the non-magnetic thin plate workpiece by the numerical control grinding machine.

[0020] Further, the cooperation of the first inclined surface and the second inclined surface also provides a guiding effect for the movement of the pressure rod, so that the pressure rod is more stable during the movement to the magnetic seat, the collision and wear between the components of the clamp assembly caused by unstable movement are avoided, the service life of the clamp assembly is prolonged, and the maintenance cost of the equipment is reduced.

[0021] Preferably, the front side wall of the magnetic seat is provided with a guide rail, a guide groove penetrating through the left and right ends of the guide rail is formed in the guide rail, the guide groove is in a T-shaped structure, a waist-shaped hole is formed in the front side of the upper end surface of the pressure rod, the waist-shaped hole completely penetrates through the upper and lower sides of the pressure rod, the length of the waist-shaped hole is arranged in the front-rear direction, a fastening bolt is arranged in the waist-shaped hole, the head of the fastening bolt is in sliding connection with the upper end surface of the pressure rod, the lower end of the fastening bolt extends into the guide groove, a fastening block is slidably arranged in the guide groove, and the fastening bolt is in threaded connection with the fastening block.

[0022] When the magnetic base is powered to generate magnetic force, the pressing rod moves to the direction of the magnetic base under the magnetic force of the magnetic base, and after the pressing rod is attached to the magnetic base, the fastening bolt is rotated to screw into the fastening block, the head of the fastening bolt is in sliding connection with the upper end surface of the pressing rod, and when the fastening bolt screws into the fastening block, the fastening block is limited by the guide groove and cannot rotate and move upwardly to the upper side of the guide groove, the distance between the head of the fastening bolt and the fastening block gradually decreases, and the pressing rod is pressed downwardly by the fastening bolt, thereby enhancing the clamping effect of the lever on the plate to be ground, ensuring that the plate to be ground can be more stably fixed on the workbench during grinding and cannot be displaced or vibrated due to the grinding force, and the surface grinding precision and quality of the non-magnetic thin plate workpiece by the numerical control grinding machine are ensured.

[0023] Further, after the grinding of the plate to be ground is completed, the power of the magnetic base is disconnected, the magnetic force of the magnetic base disappears, the elastic force of the plate spring is released, the fastening and locking of the fastening bolt and the fastening block are avoided, the elastic force of the multiple plate springs is prevented from being released instantaneously to cause the jumping of the pressing rod when the magnetic force of the magnetic base disappears, the problem that the surface of the completed grinding workpiece is scratched or the pressing rod collides with other parts on the numerical control grinding machine is avoided, and the safety and stability of the clamp assembly are improved.

[0024] Preferably, the upper end surface of the magnetic base is provided with a rubber pad, the thickness of the rubber pad is 1-3 mm, and the periphery of the rubber pad exceeds the periphery of the plate to be ground by 10-20 mm.

[0025] When the plate to be ground is placed on the magnetic base for processing, the rubber pad can play a good buffering and protection role, on the one hand, the rubber pad has a certain elasticity and can further absorb the vibration generated during grinding, reduce the influence of the vibration on the plate to be ground, improve the stability of processing, and ensure the grinding precision and quality; on the other hand, when the pressing rod clamps the plate to be ground, the rubber pad can avoid the direct rigid contact between the plate to be ground and the magnetic base, prevent the surface of the plate to be ground from being damaged due to excessive clamping force, and protect the processing quality of the workpiece.

[0026] Further, when the plate to be ground is ground, since the periphery of the rubber pad exceeds the periphery of the plate to be ground, the problem that the edge of the plate to be ground collapses without support is avoided, the supporting effect of the rubber pad on the plate to be ground is ensured, the stability of processing is improved, and the grinding precision and quality are ensured.

[0027] Preferably, a plurality of evenly distributed deformation grooves are arranged on the lower end surface of the compensation block, the vertical projection of the deformation groove is in a wave shape, and the extension direction of the deformation groove is the front-back direction.

[0028] The multiple deformation grooves enable the compensation block to deform more finely when in contact with the surface of the plate to be ground according to the micro relief of the surface of the plate to be ground, the wavy deformation groove can better adapt to the uneven surface when the lower end surface of the compensation block is in contact with the surface of the plate to be ground, the contact between the compensation block and the plate to be ground is more close and uniform, thereby effectively reducing the local stress concentration and avoiding uneven distribution of clamping force caused by poor contact, and further improving the stability of the plate to be ground during processing.

[0029] Further, the wavy structure of the deformation groove also increases the friction between the compensation block and the plate to be ground, which helps to prevent the plate to be ground from sliding during grinding and ensures the processing precision; and the wavy deformation groove can also disperse stress, reduce material fatigue, and prolong the service life of the compensation block to a certain extent, so that the compensation block maintains stable performance during long-term use.

[0030] Preferably, the position where the pressing rod is provided with the mounting groove is provided with a horizontal part and a vertical part, the horizontal part and the vertical part are connected and form an L-shaped structure, and the vertical part is arranged in the arc-shaped opening of the leaf spring.

[0031] By arranging the horizontal part and the vertical part at the position where the pressing rod is provided with the mounting groove, the pressing rod is more stable when subjected to force, the L-shaped structure can effectively disperse the elastic force transmitted by the leaf spring, and avoid damage to the pressing rod caused by stress concentration; and the vertical part is arranged in the arc-shaped opening of the leaf spring, which further enhances the connection stability between the pressing rod and the leaf spring, and ensures that the elastic force of the leaf spring stably acts on the lever during the movement of the pressing rod, thereby ensuring that the clamping effect of the lever on the plate to be ground is always stable and reliable.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1. By arranging the pressing rod, the lever and the leaf spring, the pressing rod is moved towards the magnetic attraction seat under the action of the magnetic force of the magnetic attraction seat, the leaf spring is compressed, the elastic force of the leaf spring acts on one end of the lever located in the mounting groove, and the elastic force is converted into a downward pressure on the other end of the lever located outside the mounting groove through the lever and the first hinge seat, thereby completing the clamping force on the plate to be ground, ensuring the horizontal constraint effect on the plate to be ground, and ensuring the surface grinding quality of the numerical control grinding machine on the non-magnetic thin plate workpiece.

[0034] 2. By arranging the electromagnetic seat and the magnetic attraction block, the electromagnetic seat generates a magnetic force that attracts the magnetic attraction block when the electromagnetic seat is powered on, the magnetic attraction block moves downward along the first inclined surface under the action of the magnetic force, and the movement trend of the pressing rod towards the magnetic attraction seat is further enhanced, thereby strengthening the clamping effect of the lever on the plate to be ground, ensuring that the plate to be ground can be more stably fixed on the workbench during grinding, and further ensuring the surface grinding precision and quality of the numerical control grinding machine on the non-magnetic thin plate workpiece.

[0035] 3、The present application is through the setting of fastening bolt and fastening block, when clamping the plate to be polished, rotating the fastening bolt into the fastening block, the pressure bar is pressed by the fastening bolt, thereby enhancing the clamping effect of the lever on the plate to be polished, ensuring that the plate to be polished can be more stably fixed on the workbench during the grinding process, and displacement or vibration will not occur due to the action of the grinding force, thereby ensuring the surface grinding precision and quality of the non-magnetic thin plate workpiece of the numerical control grinding machine. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the numerical control grinding machine for high-precision metal part machining of the present application;

[0037] Figure 2 It is a schematic diagram of the structure of the clamp assembly in the numerical control grinding machine for high-precision metal part machining of the present application;

[0038] Figure 3 It is a top view of the clamp assembly in the numerical control grinding machine for high-precision metal part machining of the present application;

[0039] Figure 4 It is Figure 3 the full sectional view at A-A;

[0040] Figure 5 It is Figure 4 the full sectional view at B-B;

[0041] Figure 6 It is a schematic diagram of the structure of the pressure bar in the numerical control grinding machine for high-precision metal part machining of the present application;

[0042] Figure 7 It is Figure 6 the local enlarged view at C.

[0043] In the figure: 1, base; 2, workbench; 3, column; 4, main shaft; 5, clamp assembly; 6, mounting bracket; 7, magnetic seat; 8, pressure bar; 9, No. 1 hinged seat; 10, No. 2 hinged seat; 11, mounting groove; 12, lever; 13, leaf spring; 14, magnetic block; 15, compensation block; 16, rubber pad; 17, electromagnetic seat; 18, No. 1 inclined surface; 19, magnetic block; 20, No. 2 inclined surface; 21, guide rail; 22, guide groove; 23, fastening block; 24, fastening bolt; 25, deformation groove; 26, plate to be polished; 27, waist-shaped hole; 28, horizontal part; 29, vertical part. DETAILED DESCRIPTION

[0044] Please refer to Figures 1 to 7 , the present application provides a numerical control grinding machine for high-precision metal part machining, the technical scheme is as follows:

[0045] A kind of high-precision metal piece processing numerical control grinding machine, please refer to Figures 1 to 4 、 Figure 6 And Figure 7 , including base 1 and worktable 2 being arranged on base 1, be equipped with horizontal drive assembly for driving worktable 2 horizontal motion in base 1, worktable 2 is fixedly installed with clamp assembly 5, the rear side of base 1 is equipped with column 3, column 3 is vertically installed, and column 3 is fixedly installed with base 1, the front end of column 3 is equipped with spindle 4, column 3 is equipped with vertical drive assembly for driving the up-and-down movement of spindle 4, while column 3 is equipped with spindle 4 motor for driving the rotation of spindle 4, the front end of spindle 4 is equipped with clamping installation for polishing polishing wheel (not shown in figure), the axial direction of spindle 4 and polishing wheel is all horizontally arranged, clamp assembly 5 includes mounting bracket 6, magnetic attraction seat 7 and two pressure rods 8, mounting bracket 6 is fixedly installed on worktable 2, magnetic attraction seat 7 is fixedly installed on the upper end surface of mounting bracket 6, the upper end surface of magnetic attraction seat 7 is equipped with rubber pad 16, the thickness of rubber pad 16 is 2.0mm, and the periphery of rubber pad 16 is 15mm more than the periphery of the plate to be polished 26, pressure rod 8 is slidably installed on magnetic attraction seat 7, the lower end of pressure rod 8 is provided with a plurality of installation grooves 11, a plurality of installation grooves 11 are uniformly arranged along the front-rear direction of pressure rod 8, and a plurality of installation grooves 11 all completely penetrate the front-rear two ends of pressure rod 8, the position of pressure rod 8 provided with installation groove 11 is provided with horizontal part 28 and vertical part 29, horizontal part 28 is connected with vertical part 29, and is in the shape of "L", vertical part 29 is arranged in the arc-shaped opening of leaf spring 13, the front-rear two sides of each installation groove 11 are provided with one hinge seat 9 and two hinge seats 10, one hinge seat 9 is arranged on the side wall opposite to the two pressure rods 8, two hinge seats 10 are arranged on the side wall opposite to the two pressure rods 8, each installation groove 11 is provided with lever 12, a plurality of levers 12 are respectively hinged with one hinge seat 9 on the two sides of the installation groove 11, the side of a plurality of levers 12 hinged with one hinge seat 9 all extends to the outside of pressure rod 8, the upper side of the end of a plurality of levers 12 extending to the outside of pressure rod 8 is provided with magnetic block 14, magnetic block 14 is fixedly connected with lever 12, and the magnetic pole of magnetic block 14 is the same as the magnetic pole direction of magnetic attraction seat 7, the lower side of the end of a plurality of levers 12 extending to the outside of pressure rod 8 is provided with compensation block 15, compensation block 15 is fixedly connected with lever 12, and the lower end surface of compensation block 15 is a plane, compensation block 15 is made of rubber material, the lower end surface of compensation block 15 is provided with a plurality of evenly distributed deformation grooves 25, the vertical projection of deformation groove 25 is wave-shaped, and the extension direction of deformation groove 25 is front-rear direction, each installation groove 11 is provided with leaf spring 13, one end of leaf spring 13 is hinged with two hinge seats 10, the other end is hinged with one end of lever 12 in installation groove 11, a plurality of leaf springs 13 are all in the shape of arc with opening facing upwards, and the lowest point of leaf spring 13 extends to the lower side of pressure rod 8 8mm in the relaxed state.

[0046] Please refer to Figure 3 And Figure 5The rear side wall of the magnetic seat 7 is provided with an electromagnetic seat 17, the upper end of the electromagnetic seat 17 is provided with a first inclined surface 18, the first inclined surface 18 is directed to the upper rear of the electromagnetic seat 17, the rear end of each of the two pressing rods 8 is connected with a magnetic block 19 through a bolt, the lower end of the magnetic block 19 is provided with a second inclined surface 20, the second inclined surface 20 is in sliding connection with the first inclined surface 18; the front side wall of the magnetic seat 7 is provided with a guide rail 21, the guide rail 21 is provided with a guide groove 22 penetrating through the left and right ends of the guide rail 21, the guide groove 22 is in a T-shaped structure, the front side of the upper end surface of the pressing rod 8 is provided with a waist-shaped hole 27, the waist-shaped hole 27 completely penetrates through the upper and lower sides of the pressing rod 8, the length of the waist-shaped hole 27 is arranged along the front and rear directions, the waist-shaped hole 27 is provided with a fastening bolt 24, the head of the fastening bolt 24 is in sliding connection with the upper end surface of the pressing rod 8, the lower end of the fastening bolt 24 extends into the guide groove 22, the guide groove 22 is slidably provided with a fastening block 23, the fastening bolt 24 is in threaded connection with the fastening block 23.

[0047] It should be noted that, since the clamping of the lever 12 to the to-be-ground plate needs to occupy the surface area of the to-be-ground plate 26, the front and rear sides of the to-be-ground plate 26 are both provided with clamping areas for clamping, after the grinding process is completed, the clamping areas on the to-be-ground plate 26 are cut off, wherein, the clamping area can be provided with a width of 15-25mm, the to-be-ground area in the embodiment has a width of 20mm.

[0048] Working principle: please refer to Figures 1 to 7When the non-magnetic sheet workpiece needs to be polished, the workpiece is placed on the rubber pad 16 at the upper end of the magnetic seat 7, and the rubber pad 16 plays a buffering and protective role to avoid rigid contact between the workpiece and the magnetic seat 7. Then the magnetic seat 7 is powered, and the magnetic seat 7 generates a magnetic force, and the electromagnetic seat 17 is also powered synchronously, and the magnetic force between the electromagnetic seat 17 and the magnetic block 19 is generated. Due to the cooperation of the first inclined surface 18 and the second inclined surface 20, the magnetic block 19 moves downward along the first inclined surface 18 under the action of the magnetic force, further enhancing the movement trend of the pressing rod 8 to the magnetic seat 7. At the same time, the pressing rod 8 moves to the magnetic seat 7 under the action of the magnetic force of the magnetic seat 7, and after the pressing rod 8 is attached to the magnetic seat 7, the fastening bolt 24 is rotated and screwed into the fastening block 23. Because the head of the fastening bolt 24 is in sliding connection with the upper end surface of the pressing rod 8, and the fastening block 23 is limited by the guide groove 22 and cannot rotate and move upward in the guide groove 22, the distance between the head of the fastening bolt 24 and the fastening block 23 gradually decreases, and the pressing rod 8 is pressed downward by the fastening bolt 24. When the pressing rod 8 moves to the magnetic seat 7, the leaf spring 13 is compressed, and the elastic force of the leaf spring 13 acts on one end of the lever 12 in the mounting groove 11, and is converted into a downward pressure on the other end of the lever 12 outside the mounting groove 11 through the lever 12 and the first hinge seat 9. The compensation block 15 at the lower end of the lever 12 is tightly pressed on the clamping area of the workpiece, the clamping of the workpiece is completed, and the horizontal constraint effect on the workpiece is ensured. In the grinding process, the rubber pad 16 can further absorb the vibration generated during grinding, reducing the influence of vibration on the workpiece. The deformation groove 25 enables the compensation block 15 to finely deform according to the micro undulations on the surface of the workpiece, making the contact between the compensation block 15 and the workpiece more closely and uniformly, effectively reducing local stress concentration and avoiding uneven distribution of clamping force caused by poor contact. The wavy deformation groove 25 increases the friction between the compensation block 15 and the workpiece, which helps to prevent the workpiece from slipping during grinding. The "L" shaped horizontal part 28 and vertical part 29 structure can effectively disperse the elastic force transmitted by the leaf spring 13, avoid stress concentration, and prevent damage to the pressing rod 8. The vertical part 29 is arranged in the arc-shaped opening of the leaf spring 13, enhancing the connection stability between the pressing rod 8 and the leaf spring 13, ensuring that the elastic force of the leaf spring 13 stably acts on the lever 12, thereby ensuring that the clamping effect of the lever 12 on the workpiece is always stable and reliable, and ensuring that the workpiece can be more stably fixed on the workbench 2 during grinding, without displacement or vibration caused by grinding force, thereby ensuring the surface polishing precision and quality of the non-magnetic sheet workpiece of the numerical control grinding machine.After the grinding of the plate 26 to be ground is completed, the power supply to the magnetic base 7 is disconnected, the magnetic base 7 loses the magnetic force, the fastening bolt 24 is rotated to be screwed out of the fastening block 23, the elastic force of the plate spring 13 is gradually released, the plate spring 13 returns to the free state, the elastic force of the plate spring 13 applied to the lever 12 is gradually reduced, the pressure applied by the lever 12 to the ground workpiece is gradually reduced, so that the clamping of the lever 12 to the ground workpiece is released, the elastic return effect of the plate spring 13 ensures that the end of the lever 12 extending out of the pressure rod 8 is at the same position height in the unclamped state, the ground workpiece is taken off, and thus the grinding process of the plate 26 to be ground is completed.

[0049] The above describes one specific embodiment of the present application in detail in combination with the drawings, but the present application is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, replacements and variations of the embodiment can be made without departing from the principles and ideas of the present application, and should still fall within the protection scope of the present application.

Claims

1. A numerical control grinding machine for high-precision metal part processing, comprising a base (1) and a worktable (2) arranged on the base (1), a clamp assembly (5) being fixedly installed on the worktable (2), characterized in that, The clamp assembly (5) comprises a mounting frame (6), a magnetic seat (7) and two pressing rods (8), the mounting frame (6) and the magnetic seat (7) are fixedly installed on the workbench (2) from bottom to top, the pressing rod (8) is slidably installed on the magnetic seat (7), the lower end of the pressing rod (8) is provided with a plurality of installation grooves (11) which are uniformly distributed along the front and back directions, the plurality of installation grooves (11) are completely penetrated through the front and back ends of the pressing rod (8), the front and back sides of each installation groove (11) are provided with a first hinge seat (9) and a second hinge seat (10), the first hinge seat (9) is arranged on the side wall opposite to the two pressing rods (8), the second hinge seat (10) is arranged on the side wall away from the two pressing rods (8), a lever (12) is arranged in each installation groove (11), the plurality of levers (12) are hingedly connected with the first hinge seat (9) on the two sides of the installation groove (11), the side of the plurality of levers (12) hingedly connected with the first hinge seat (9) extends to the outside of the pressing rod (8), a leaf spring (13) is arranged in each installation groove (11), one end of the leaf spring (13) is hingedly connected with the second hinge seat (10), the other end of the leaf spring (13) is hingedly connected with one end of the lever (12) in the installation groove (11), the plurality of leaf springs (13) are in arc shape with the opening facing upwards, and the lowest point of the leaf spring (13) extends to the lower side of the pressing rod (8) by 5-10mm in the relaxed state; The upper side of the end of the plurality of levers (12) extending to the outside of the pressing rod (8) is provided with a magnetic block (14), the magnetic block (14) is fixedly connected with the lever (12), and the magnetic pole of the magnetic block (14) is the same as the magnetic pole of the magnetic seat (7); The rear side wall of the magnetic seat (7) is provided with an electromagnetic seat (17), the upper end of the electromagnetic seat (17) is provided with a first inclined surface (18), the first inclined surface (18) faces the upper rear of the electromagnetic seat (17), the rear end of each of the two pressing rods (8) is connected with a magnetic block (19) through a bolt, the lower end of the magnetic block (19) is provided with a second inclined surface (20), and the second inclined surface (20) is slidably connected with the first inclined surface (18).

2. The numerical control grinder for high-precision metal piece machining according to claim 1, characterized in that, The lower side of the end of the plurality of levers (12) extending to the outside of the pressing rod (8) is provided with a compensation block (15), the compensation block (15) is fixedly connected with the lever (12), the lower end surface of the compensation block (15) is a plane, and the compensation block (15) is made of rubber material.

3. The high-precision numerical control grinder for metal piece machining according to claim 1, characterized in that, The front side wall of the magnetic seat (7) is provided with a guide rail (21), the guide rail (21) is provided with a guide groove (22) penetrating through the left and right ends of the guide rail (21), the guide groove (22) is a "T" shaped structure, the front side of the upper end surface of the pressing rod (8) is provided with a waist-shaped hole (27), the waist-shaped hole (27) completely penetrates through the upper and lower sides of the cavity of the pressing rod (8), the length of the waist-shaped hole (27) is arranged along the front and back directions, the waist-shaped hole (27) is provided with a fastening bolt (24), the head of the fastening bolt (24) is in sliding connection with the upper end surface of the pressing rod (8), the lower end of the fastening bolt (24) extends into the guide groove (22), the guide groove (22) is slidably provided with a fastening block (23), and the fastening bolt (24) is in threaded connection with the fastening block (23).

4. The high-precision numerical control grinder for metal piece machining according to claim 2, characterized in that, The upper end surface of the magnetic seat (7) is provided with a rubber pad (16), the thickness of the rubber pad (16) is 1-3mm, and the periphery of the rubber pad (16) is 10-20mm longer than the periphery of the plate to be polished (26).

5. The high-precision numerical control grinder for metal piece machining according to claim 2, characterized in that, The lower end surface of the compensation block (15) is provided with a plurality of uniformly distributed deformation grooves (25), the vertical projection of the deformation groove (25) is a wave shape, and the extension direction of the deformation groove (25) is the front and back directions.

6. The high-precision numerical control grinder for metal piece machining according to claim 1, characterized in that, The position of the pressing rod (8) provided with the mounting groove (11) is provided with a horizontal part (28) and a vertical part (29), the horizontal part (28) is in connection with the vertical part (29) and is in "L" shape, and the vertical part (29) is arranged in the arc-shaped opening of the leaf spring (13).

Images