A grinding device

Abstract

The present invention provides a grinding device, comprising a centerless grinding system, a tooling system and an auxiliary drive system with a flexible clamping function; the centerless grinding system comprises a grinding wheel and a guide wheel, the grinding wheel and the guide wheel can be controlled to rotate, and an axis L1 and an axis L2 are parallel and both are arranged with an inclination relative to a horizontal plane; the tooling system comprises an annular tooling piece, the annular tooling piece surrounds the outer circumference of the guide wheel, the annular tooling piece can be controlled to rotate around an axis L3, and the axis L3 is parallel to the axis L1; the annular tooling piece comprises an annular sheet-shaped main body, a plurality of workstations are sequentially formed on the front side of the annular sheet-shaped main body at intervals in the circumferential direction, the workstations are formed with groove structures that can accommodate workpieces, and the workpieces can be rotated to a grinding area with the annular tooling piece; the auxiliary drive system with a flexible clamping function is arranged on the back side of the annular sheet-shaped main body, and can make the workpiece in the grinding area fit with the main positioning surface and make the workpiece rotate, so that the grinding wheel can grind the workpiece; the processing cost is low and the efficiency is high, and the use range of the sheet-shaped workpiece is expanded.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding processing, and in particular relates to a grinding device. Background Art

[0002] In the existing mechanical processing equipment, the finishing technology for sheet workpieces is still immature, especially for sheet workpieces with a circular cross-sectional structure. When the workpiece thickness is large and the processing batch is small, regardless of cost, the workpiece can be clamped by a magnetic chuck or mechanical clamping method, and processed by single-piece grinding. However, when the workpiece thickness is at the millimeter level and the processing batch is large, the existing processing equipment is almost powerless, and the workpiece will produce end face swing during the grinding process, resulting in the scrapping of the workpiece and even serious production accidents. On the one hand, the processing cost is high and the efficiency is low, and on the other hand, the application scope of sheet workpieces is greatly limited. Summary of the invention

[0003] In view of this, the present invention provides a grinding device to solve the problems that the existing processing equipment in the prior art cannot process sheet-shaped workpieces with circular cross-sections in large quantities, resulting in high processing costs and narrow application ranges for such workpieces.

[0004] The present invention provides a grinding device for processing a sheet-shaped workpiece with a circular cross-section; the grinding device comprises:

[0005] A centerless grinding system, comprising a grinding wheel and a guide wheel, wherein a grinding zone is formed between the outer peripheral surface of the grinding wheel and the outer peripheral surface of the guide wheel; the grinding wheel and the guide wheel can be controlled to rotate around their respective axes, wherein the axis L1 of the grinding wheel and the axis L2 of the guide wheel are parallel, and the axes L1 and L2 are arranged to be inclined relative to a horizontal plane;

[0006] A tooling system, comprising an annular tooling piece, the annular tooling piece surrounds the outer periphery of the guide wheel, the annular tooling piece can be controlled to rotate around an axis L3, the axis L3 is parallel to the axis L1 and the axis L2 respectively, and the guide wheel is eccentrically arranged relative to the annular tooling piece;

[0007] The annular tooling piece comprises an annular sheet-shaped main body, and a plurality of workstations are sequentially formed on the front side of the annular sheet-shaped main body at intervals in the circumferential direction; each of the workstations is provided with a main positioning surface, an auxiliary positioning surface and an auxiliary supporting surface, the main positioning surface is formed on the annular plane of the annular sheet-shaped main body, and the auxiliary positioning surface and the auxiliary supporting surface are relatively arranged on both sides of the main positioning surface along the rotation direction of the annular tooling piece; the main positioning surface, the auxiliary positioning surface and the auxiliary supporting surface constitute a groove structure that can movably accommodate the workpiece; the groove structure is an open structure on both sides perpendicular to the rotation direction of the axis L3, the guide wheel is arranged on the inner side of the open structure, and the grinding wheel is arranged on the outer side of the open structure; when the workpiece rotates to the grinding area with the annular tooling piece, one side of the outer peripheral surface of the workpiece contacts the outer peripheral surface of the grinding wheel, and the other side contacts the outer peripheral surface of the guide wheel;

[0008] An auxiliary drive system with a flexible clamping function is arranged on the back side of the annular sheet-like body. On the one hand, it provides a limiting effect on the direction of the axis L3 for the workpiece in the grinding area, and on the other hand, it provides a driving torque for the workpiece in the grinding area to rotate relative to the annular sheet-like body in the groove structure.

[0009] Further optionally, the groove structure formed by the main positioning surface, the auxiliary positioning surface and the auxiliary supporting surface is wedge-shaped, and the circumferential width of the groove structure gradually decreases from the outside to the inside along the radial direction of the annular sheet-like body.

[0010] Further optionally, the main positioning surface is perpendicular to the axis L3, and each of the main positioning surfaces is on the same plane; the auxiliary positioning surface and the auxiliary supporting surface are both inclined, and the inclination angle α of the auxiliary positioning surface is smaller than the inclination angle β of the auxiliary supporting surface;

[0011] Among them, for each of the workstations: α is the angle between the auxiliary positioning surface of the workstation and the radial reference plane of the workstation; β is the angle between the auxiliary supporting surface of the workstation and the radial reference plane of the workstation, and the radial reference plane is the radial plane of the workstation through the inner edge of the auxiliary positioning surface and the axis L3.

[0012] Further optionally, α and β satisfy: 20°≤β≤50°, 15°≤β-α≤30°.

[0013] Further optionally, the rotation direction of the annular tooling piece depends on whether the grinding wheel is arranged on the left side or the right side of the guide wheel; if the grinding wheel is arranged on the left side of the guide wheel, the annular tooling piece rotates counterclockwise; if the grinding wheel is arranged on the right side of the guide wheel, the annular tooling piece rotates clockwise, ensuring that the loading area is located above the annular tooling piece, and the workpiece can enter the grinding area from above. Looking down at the annular sheet-like body from above, if the annular sheet-like body rotates in the counterclockwise direction, the auxiliary positioning surface and the auxiliary supporting surface are both arranged in a right-handed spiral shape; conversely, if the annular sheet-like body rotates in the clockwise direction, the auxiliary positioning surface and the auxiliary supporting surface are both arranged in a left-handed spiral shape.

[0014] Further optionally, the auxiliary support surface and the auxiliary positioning surface satisfy: γ≥120°;

[0015] Wherein, γ is the angle at which the annular tooling member can rotate when the workpiece is located and held in the groove structure.

[0016] Further optionally, a loading area is formed on one side of the outer circumference of the annular tooling piece, and a unloading area is formed on the other side of the outer circumference of the annular tooling piece; along the rotation direction of the annular tooling piece, the loading area and the unloading area are respectively located on both sides of the grinding area;

[0017] When the annular tooling rotates and places the workstation in the loading area, the workpiece is put into the workstation corresponding to the annular sheet-shaped body from the feeding port of the loading area, and the main positioning surface provides positioning for the workpiece in the direction of the axis L3, and the auxiliary positioning surface and the auxiliary supporting surface provide positioning for the workpiece in the direction perpendicular to the axis L3;

[0018] When the annular tooling rotates and places the workstation in the grinding area, the main positioning surface can provide positioning for the workpiece in the direction of the axis L3, and the auxiliary positioning surface and the guide wheel can provide positioning for the workpiece in a direction perpendicular to the axis L3;

[0019] When the annular tooling member rotates and places the workstation at the discharge port of the unloading area, the workpiece at the workstation can be separated from the corresponding groove structure.

[0020] Further optionally, the auxiliary support surface and the auxiliary positioning surface also satisfy: R1<R2, and 0.03mm≤R2-R1≤0.10mm;

[0021] Wherein, R1 is the radial distance between the workpiece and the axis L3 when the workpiece is in the loading area, and R2 is the radial distance between the workpiece and the axis L3 when the workpiece is in the grinding area.

[0022] Further optionally, the auxiliary drive system with flexible clamping function includes a magnetic device, which acts on the workpiece in the grinding zone in a non-contact manner. The magnetic device generates an inclined rotating magnetic field to generate both axial suction and rotational driving torque on the workpiece, so that one end face of the workpiece in the grinding zone is in contact with the main positioning surface and can rotate in the groove structure.

[0023] Further optionally, the magnetic device includes an end face stator, which includes an end face core and an end face winding wound on the end face core; when three-phase alternating current is passed through the end face winding, the end face stator generates a rotating magnetic field and drives the workpiece to rotate.

[0024] Further optionally, the magnetic device includes an end rotor, which is a permanent magnet and can be controlled to rotate, and the end rotor rotates and drives the workpiece to rotate.

[0025] Further optionally, a plurality of reinforcing ribs are sequentially formed at circumferential intervals on the back side of the annular sheet-like body, and the plurality of reinforcing ribs are arranged in one-to-one correspondence with the plurality of workstations.

[0026] Further optionally, the auxiliary drive system with flexible clamping function also includes a transmission member, which is in transmission connection with the magnetic device; the transmission member can move the magnetic device along the axial or radial direction of the annular tooling member.

[0027] Further optionally, the open structure close to the grinding wheel is a completely open structure, and the open structure close to the guide wheel is an incompletely open structure.

[0028] Further optionally, the axis L1, the axis L2 and the axis L3 constitute a mutually parallel inclined axis system, the axis L2 and the axis L3 are both cantilevered, and the inclined axis system has a common normal plane;

[0029] The centerless grinding system further comprises a grinding wheel driving device and a guide wheel driving device, wherein the grinding wheel driving device can drive the grinding wheel to rotate, and the guide wheel driving device can drive the guide wheel to rotate; the grinding wheel driving device is arranged below the common normal plane, and the guide wheel driving device is arranged above the common normal plane;

[0030] The tooling system comprises an annular tooling piece driving device, which can drive the annular tooling piece to rotate, and the annular tooling piece driving device is arranged below the common normal plane.

[0031] Compared with the prior art, the beneficial effects of the present invention are mainly:

[0032] (1) Axis L1, L2 and L3 are parallel and inclined relative to the horizontal plane; a grinding zone is formed between the outer peripheral surface of the grinding wheel and the outer peripheral surface of the guide wheel, an annular tooling piece surrounds the outer periphery of the guide wheel and the annular sheet body forms a plurality of workstations, the workstations form a groove structure that can accommodate the workpiece, and the workpiece can rotate to the grinding zone with the annular tooling piece; when the workpiece is in the grinding zone, the outer peripheral surface of the grinding wheel and the outer peripheral surface of the guide wheel can contact the two sides of the outer peripheral surface of the workpiece respectively, and the auxiliary drive system with a flexible clamping function can provide the workpiece with a limiting effect in the direction of axis L3 and a driving torque to make the workpiece rotate in the groove structure, at which time the grinding wheel and the guide wheel are rotated, and then the grinding wheel can grind the workpiece, so as to realize large-scale processing of sheet-shaped workpieces with a circular cross-section structure; the equipment has a simple structure, low processing cost and high efficiency, and expands the scope of use of sheet-shaped workpieces; fills the gap that the existing centerless grinding equipment is not suitable for processing sheet-shaped workpieces, and finds a feasible way for large-scale, high-efficiency, low-cost and high-yield processing of sheet-shaped workpieces with a thickness of millimeters;

[0033] (2) The groove structure is wedge-shaped, and the circumferential width of the groove structure gradually decreases from the outside to the inside along the radial direction of the annular sheet body; the main positioning surface is perpendicular to the axis L3 and each main positioning surface is on the same plane, and the auxiliary positioning surface and the auxiliary supporting surface are relatively arranged on both sides of the main positioning surface along the rotation direction of the annular tooling piece; the annular tooling piece intermittently indexes and rotates, so that when any station is in the loading area, the workpiece can be placed in the corresponding groove structure, the main positioning surface can provide the workpiece with positioning in the direction of the axis L3, and the auxiliary positioning surface and the auxiliary supporting surface can provide the workpiece with positioning in the direction perpendicular to the axis L3, so as to prevent the workpiece from falling to the inside of the annular tooling piece;

[0034] When any station is in the grinding area, the main positioning surface can provide positioning for the workpiece in the direction of the axis L3, and the auxiliary positioning surface and the guide wheel can provide positioning for the workpiece in the direction perpendicular to the axis L3, so that the workpiece can be accurately positioned in the groove structure, avoiding the workpiece from falling downward or to the inside of the annular tooling, and then the grinding wheel can grind the workpiece, thereby improving the positioning accuracy and grinding accuracy of the workpiece; when any station is in the unloading area, the workpiece in the groove structure can be separated from the groove structure, realizing automatic unloading, and simplifying the grinding process of the workpiece;

[0035] (3) The rotation direction of the annular tooling piece depends on whether the grinding wheel is set on the left side or the right side of the guide wheel; if the grinding wheel is set on the left side of the guide wheel, the annular tooling piece rotates counterclockwise; if the grinding wheel is set on the right side of the guide wheel, the annular tooling piece rotates clockwise, ensuring that the loading area is located above the annular tooling piece and the workpiece enters the grinding area from above; when the rotation direction of the annular tooling piece is different, multiple auxiliary positioning surfaces and multiple auxiliary supporting surfaces are set in different vortex shapes; during the grinding process, the tangential grinding force can generate an inclined positive pressure on the auxiliary supporting surface, and the positive pressure can be decomposed into a radial force pointing to the guide wheel on the workpiece, so that the positive pressure between the workpiece and the guide wheel is greater than the positive pressure between the workpiece and the grinding wheel, so that the rotation speed of the workpiece can be adjusted by the guide wheel;

[0036] (4) R1<R2. On the one hand, when the workstation is in the loading area, the auxiliary support surface can hold the workpiece. On the other hand, when the workstation is in the grinding area, the workpiece is pushed away from the auxiliary support surface by the guide wheel. The auxiliary positioning surface and the guide wheel complete the precise positioning of the workpiece on the plane perpendicular to the L3 direction. At the same time, the workpiece can be close to the grinding wheel, so that the grinding wheel can complete effective grinding. It is avoided that the workpiece contacts the auxiliary support surface when the workstation is in the grinding area, and over-positioning or abnormal positioning occurs, so that the centerless grinding process cannot be carried out normally.

[0037] (5) The annular tooling is made of non-metallic wear-resistant insulating material. The magnetic device acts on the workpiece in the grinding area without contact. The magnetic device generates an inclined rotating magnetic field to make the workpiece stick to the main positioning surface and rotate in the corresponding groove structure. This prevents the workpiece from stopping its rotation due to the friction resistance on its end face during the no-feed grinding stage, resulting in grinding defects on the workpiece surface. When the magnetic device includes an end face rotor, it is suitable for sheet workpieces with very small outer diameters, and can reduce the possibility of the auxiliary drive system with a flexible clamping function being corroded by the grinding coolant.

[0038] (6) A plurality of reinforcing ribs are formed in sequence at intervals in the circumferential direction on the back side of the annular sheet body to improve the rigidity of the annular tooling piece; the transmission member can drive the magnetic device to move along the axial and radial directions of the annular tooling piece so that the magnetic device can avoid the reinforcing ribs during the grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0041] Figure 1 A schematic diagram of the shaft side structure of an embodiment of the grinding equipment provided by the present invention;

[0042] Figure 2a and Figure 2b A schematic diagram of the structure of an embodiment of the arrangement of the inclined shaft system in the grinding equipment provided by the present invention;

[0043] Figure 3a and Figure 3b A schematic diagram of a partial assembly structure of a grinding device embodiment provided by the present invention;

[0044] Figure 4a and Figure 4b A schematic structural diagram of an embodiment of an annular tooling member provided by the present invention;

[0045] Figure 5a , Figure 5b and Figure 5c A schematic structural diagram of another embodiment of the annular tooling member provided by the present invention;

[0046] In the figure:

[0047] 11-grinding wheel; 111-grinding wheel driving device; 12-guide wheel; 121-guide wheel driving device; 131-common normal plane; 132-horizontal plane;

[0048] 2-annular sheet body; 21-groove structure; 211a~211l-main positioning surface; 212-auxiliary positioning surface; 2121-inner edge; 213-auxiliary supporting surface; 214-open structure; 215-radial reference surface; 22-reinforcement rib; 3-workpiece; 4-magnetic device. DETAILED DESCRIPTION

[0049] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0050] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0051] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0053] In the existing mechanical processing equipment, the finishing technology for sheet workpieces is still immature, especially for sheet workpieces with circular cross-sections. When the thickness of the workpiece is small or even reaches the millimeter level and the processing batch is large, the existing processing equipment is almost powerless. The workpiece will have end face swing during the grinding process, which will cause the workpiece to be scrapped and even cause serious production accidents. On the one hand, the processing cost is high and the efficiency is low, and on the other hand, the application scope of sheet workpieces is greatly limited.

[0054] The present invention improves some structures of the existing grinding equipment, including optimizing the arrangement of the grinding wheel and the guide wheel, designing a tooling system that can continuously convey the workpiece, and adding an auxiliary drive system that can accurately position and rotate the workpiece, so that the grinding equipment can process sheet-shaped workpieces with a circular cross-section structure; specifically, the axes of the grinding wheel and the guide wheel are inclined relative to the horizontal plane, and a grinding area is formed between the outer peripheral surface of the grinding wheel and the outer peripheral surface of the guide wheel; an annular tooling piece is arranged on the outer peripheral ring of the guide wheel, the axis of the annular tooling piece is parallel to the axis of the grinding wheel, and the front surface of the annular tooling piece is parallel to the axis of the grinding wheel. A plurality of workstations are formed on one side, and the plurality of workstations are arranged at intervals along the rotation direction of the annular tooling piece, and each workstation forms a groove structure capable of accommodating a workpiece; the workpiece can rotate to the grinding area along with the annular tooling piece, and the two sides of the outer peripheral surface of the workpiece are respectively in contact with the outer peripheral surface of the grinding wheel and the outer peripheral surface of the guide wheel; an auxiliary driving system with a flexible clamping function is arranged on the back side of the annular tooling piece, which provides the workpiece in the grinding area with a limit in the axial direction of the annular tooling piece and enables the workpiece to rotate in the corresponding groove structure; the grinding wheel and the guide wheel are rotated, and the workpiece rotates, and then the grinding wheel can grind the workpiece;

[0055] When the annular tooling moves and places different workstations in the grinding area, the grinding wheel can grind the corresponding workpiece, thereby realizing mass processing of sheet-shaped workpieces with circular cross-sections. The equipment has a simple structure, low processing cost and high efficiency, which expands the scope of use of sheet-shaped workpieces and allows sheet-shaped workpieces to be widely used in mechanical equipment like standard parts such as screws and pins. It fills the gap that the centerless grinding process is not suitable for processing sheet-shaped workpieces, and finds a feasible way for mass processing of sheet-shaped workpieces with millimeter thickness with high efficiency, low cost and high yield rate.

[0056] Preferably, the grinding device of the present invention can process: sheet-shaped workpieces with a thickness of millimeters, a circular cross-sectional structure and a non-cylindrical outer peripheral surface;

[0057] First, after each workpiece is ground, the structure of the outer peripheral surface of the grinding wheel matches the structure of the outer peripheral surface of the workpiece, so the structure of the outer peripheral surface of the workpiece can be adjusted according to the structure of the outer peripheral surface of the grinding wheel; the outer peripheral surface of the grinding wheel is designed as a first non-cylindrical surface in the present invention, and after grinding, the outer peripheral surface of the workpiece is a second non-cylindrical surface, and the second non-cylindrical surface matches the first non-cylindrical surface; therefore, the grinding device of the present invention can process sheet-like workpieces whose outer peripheral surfaces are non-cylindrical surfaces;

[0058] Second, during the grinding process, accurate and stable positioning of the workpiece is the key to ensuring the grinding accuracy and workpiece size; the present invention also designs the grinding device to include an auxiliary drive system with a flexible clamping function, so that the workpiece in the grinding area fits the main positioning surface to avoid axial movement of the workpiece during the grinding process; therefore, the grinding device of the present invention can process sheet workpieces with a thickness of millimeters;

[0059] Third, the auxiliary drive system can also make the workpiece in the grinding area rotate in the corresponding groove structure, and the guide wheel makes the workpiece contact with the grinding wheel, so that the grinding wheel and the guide wheel rotate, and the entire outer peripheral surface of the workpiece can be ground; therefore, the grinding device of the present invention can process sheet-like workpieces with a circular cross-section structure;

[0060] In summary, the grinding device of the present invention can process sheet-like workpieces with a thickness of millimeters, a circular cross-sectional structure, and a non-cylindrical outer peripheral surface.

[0061] The specific implementation of the grinding equipment of the present application is described below with reference to specific examples.

[0062] Example 1

[0063] like Figure 1 , Figure 2a and Figure 3a As shown, this embodiment provides a grinding device, including a centerless grinding system, a tooling system, and an auxiliary drive system with a flexible clamping function. Specifically:

[0064] The centerless grinding system includes a grinding wheel 11 and a guide wheel 12, wherein the grinding wheel 11 and the guide wheel 12 are radially separated from each other, and a grinding zone is formed between the outer peripheral surface of the grinding wheel 11 and the outer peripheral surface of the guide wheel 12; the grinding wheel 11 and the guide wheel 12 can be controlled to rotate around their respective axes (the axis of the grinding wheel 11 is L1, and the axis of the guide wheel 12 is L2), wherein the axis L1 of the grinding wheel 11 and the axis L2 of the guide wheel 12 are parallel, and both the axis L1 and the axis L2 are inclined relative to the horizontal plane 132;

[0065] The tooling system includes an annular tooling piece, which surrounds the outer circumference of the guide wheel 12. The annular tooling piece can be controlled to rotate around an axis L3, which is parallel to the axis L1 and the axis L2 respectively, and the guide wheel 12 is eccentrically arranged relative to the annular tooling piece; a loading area is formed on one side of the outer circumferential surface of the annular tooling piece, and a unloading area is formed on the other side of the outer circumferential surface of the annular tooling piece; along the rotation direction of the annular tooling piece, the loading area and the unloading area are respectively located on both sides of the grinding area; thus, the intermittent indexing rotation of the annular tooling piece can be used to efficiently realize the loading, grinding and unloading processes.

[0066] like Figures 4a to 5cAs shown, in this embodiment, the annular tooling piece is preferably composed of an annular sheet body 2, and a plurality of workstations are formed in sequence at circumferential intervals on the front side of the annular sheet body 2 (the front side of the annular sheet body 2 is the side of the annular sheet body 2 facing the upper side of the annular sheet body 2), and the workstations can rotate with the annular tooling piece. When the workstation is rotated to correspond to the position of the feed port of the loading area, the workpiece 3 can be put into the workstation through the feed port, thereby with the rotation of the annular tooling piece, the workpiece 3 sequentially enters the corresponding workstation from the loading area, and then sequentially enters the grinding area with the rotation of the annular tooling piece; after the grinding is completed, the workpiece 3 will continue to be temporarily held in the workstation, but with the continuous indexing rotation of the annular tooling piece, the workpiece 3 sequentially slips from the workstation in the unloading area and falls into the workpiece collection box in the unloading area (not shown in the figure). In this way, the annular tooling rotates so that each workstation is in the loading area, grinding area and unloading area in turn, and then the loading, grinding and unloading processes can be completed in turn, ensuring the continuity of the workpiece grinding process, improving the processing efficiency, and realizing large-scale grinding of sheet workpieces, solving the problem that the existing centerless grinding equipment is not suitable for processing sheet workpieces and has low processing efficiency.

[0067] Specifically, each workstation on the front side of the annular sheet body 2 (the front side of the annular sheet body 2 is the side of the annular sheet body 2 facing the top of the annular sheet body 2) is provided with a main positioning surface 211a~211l, an auxiliary positioning surface 212 and an auxiliary supporting surface 213, the main positioning surface 211a~211l is formed on the annular plane of the annular sheet body 2, the main positioning surface 211a~211l is parallel to the rotation direction of the annular tooling part, the auxiliary positioning surface 212 and the auxiliary supporting surface 213 are relatively arranged on both sides of the main positioning surface 211a~211l along the rotation direction of the annular tooling part; the main positioning surface 211a~211l, the auxiliary positioning surface 212 and the auxiliary supporting surface 213 constitute a groove structure 21 that can movably accommodate the workpiece 3. In this way, when the workstation is in the loading area, the workpiece 3 can be put into the corresponding groove structure 21, and the groove structure 21 has the function of accommodating and transferring the workpiece 3; when the workstation is in the grinding area, one side of the outer peripheral surface of the workpiece 3 in the corresponding groove structure 21 contacts the outer peripheral surface of the grinding wheel 11, and the other side contacts the outer peripheral surface of the guide wheel 12, and the groove structure 21 has the function of accommodating the workpiece 3 and improving the positioning accuracy of the workpiece 3 during grinding; when the workstation is in the unloading area, due to the inclined setting of the main positioning surfaces 211a~211l, the workpiece 3 is automatically separated from the groove structure 21 under the action of gravity. Preferably, in this embodiment, the annular sheet body 2 is formed with 12 groove structures 21, and the annular sheet body 2 can complete the grinding of 12 workpieces 3 by rotating one circle, so as to achieve the grinding of workpieces 3 in large quantities.

[0068] In addition to the above-mentioned centerless grinding system and tooling system, this embodiment also innovatively provides an auxiliary drive system with a flexible clamping function for the grinding equipment. The auxiliary drive system is arranged on the back side of the annular sheet body 2 (the back side of the annular sheet body 2 is the surface of the annular sheet body 2 facing the bottom of the annular sheet body 2). On the one hand, it provides a limiting effect on the axis L3 direction for the workpiece 3 in the grinding area to prevent the workpiece 3 from moving in the axis L3 direction during the grinding process, resulting in low grinding accuracy. On the other hand, it provides a driving torque for the workpiece 3 in the grinding area to rotate relative to the annular sheet body 2 in the groove structure 21, to prevent the workpiece 3 from stopping its rotation due to the friction resistance on its end face during the no-feed grinding stage, resulting in grinding defects on the surface of the workpiece 3, and the inability to complete the grinding of the entire outer peripheral surface of the workpiece 3.

[0069] When the workstation is in the grinding area, the auxiliary drive system with a flexible clamping function is controlled to make the workpiece 3 rotate in the corresponding groove structure 21, and the grinding wheel 11 and the guide wheel 12 are controlled to rotate, so that the entire outer peripheral surface of the workpiece 3 can be ground. Preferably, the rotation speed of the workpiece 3 is adjusted by the guide wheel 12, and the tangential grinding force and grinding speed provided by the grinding wheel 11 to the workpiece 3 can be adjusted.

[0070] During the grinding process, there are two cutting-in feeding modes, so that there is an effective grinding amount between the grinding wheel 11 and the workpiece 3; the first is: the grinding wheel 11 feeds along its own radial direction and the annular tooling piece does not feed along its own tangential direction; the second is: the grinding wheel 11 does not feed along its own radial direction and the annular tooling piece feeds along its own tangential direction; when the second cutting-in feeding mode is adopted, the auxiliary drive system with flexible clamping function must have the function of tangential feeding with the annular tooling piece to ensure that the auxiliary drive system with flexible clamping function is always below the workpiece 3 and is coaxially arranged with the workpiece 3.

[0071] Example 2

[0072] With respect to the above-mentioned embodiment 1 of the present application, this embodiment further improves the groove structure to better achieve the above-mentioned function of the groove structure.

[0073] like Figures 4a to 5c As shown, in this embodiment, the groove structure 21 is further improved to have open structures 214 on both sides of the rotation direction perpendicular to the axis L3, wherein the guide wheel 12 is arranged on the inner side of the open structure 214, and the grinding wheel 11 is arranged on the outer side of the open structure 214; further preferably, the open structure 214 on the side close to the grinding wheel 11 is a completely open structure, and the open structure 214 on the side close to the guide wheel 12 is an incompletely open structure; thereby, the completely open structure on the side close to the grinding wheel 11 can be used to make the workpiece 3 infinitely move outward along the radial direction of the annular tooling, thereby realizing the loading and unloading functions of the workpiece 3; at the same time, in the grinding area, one side of the outer peripheral surface of the workpiece can contact the outer peripheral surface of the grinding wheel 11;

[0074] In addition, by utilizing the incompletely open structure on one side close to the guide wheel 12, the workpiece 3 in the loading area can be securely accommodated in the groove structure 21 without falling downward or to the inside of the annular tooling part; at the same time, in the grinding area, the other side of the outer peripheral surface of the workpiece 3 can contact the outer peripheral surface of the guide wheel 12 to achieve precise positioning, and be pushed away from the auxiliary support surface by the guide wheel 12 to avoid over-positioning.

[0075] The groove structure 21 can be further optimized. The groove structure 21 is wedge-shaped, and the circumferential width of the open structure 214 close to the grinding wheel 11 is greater than the circumferential width of the open structure 214 close to the guide wheel 12; further preferably, the circumferential width of the groove structure 21 gradually decreases from the outside to the inside along the radial direction of the annular sheet-like body 2.

[0076] Therefore, the open structure 214 proposed in this embodiment allows the workpiece 3 to contact the grinding wheel 11 and the guide wheel 12, and can further allow the workpiece 3 to be controllably and movably limited in the groove structure 21 composed of the main positioning surfaces 211a-211l, the auxiliary positioning surface 212 and the auxiliary support surface 213, so that the grinding wheel 11 can complete effective grinding. On the other hand, the workpiece 3 can be smoothly placed into the groove structure 21 during loading and can be smoothly separated from the groove structure 21 during unloading:

[0077] When the annular tooling rotates and places the workstation in the loading area, the workpiece 3 can be put into the groove structure 21 to realize the pre-setting of the workpiece 3. The main positioning surfaces 211a to 211l can provide positioning for the workpiece 3 in the direction of the axis L3, and the auxiliary positioning surface 212 and the auxiliary supporting surface 213 can provide positioning for the workpiece 3 in the direction perpendicular to the axis L3.

[0078] When the annular tooling rotates and places the workstation in the grinding zone, the main positioning surfaces 211a~211l can provide positioning in the direction of the axis L3 for the workpiece 3, and the auxiliary positioning surfaces 212 and the guide wheel 12 can provide positioning in the direction perpendicular to the axis L3 for the workpiece 3; the grinding wheel 11 contacts the workpiece 3, and then the grinding wheel 11 can provide a radial force to the workpiece 3 during the grinding process, so that the workpiece 3 is pressed against the guide wheel 12, and the guide wheel 12 contacts the workpiece 3, and then the guide wheel 12 can provide positioning in the direction perpendicular to the axis L3 for the workpiece 3, and at this time the auxiliary support surface 213 does not contact the workpiece 3; the grinding wheel 11 and the guide wheel 12 are rotated, so that the workpiece 3 rotates, and then the grinding wheel 11 can grind the workpiece 3; the annular tooling rotates with tangential feed, so that the grinding wheel 11 can provide different grinding forces and grinding speeds to the workpiece 3;

[0079] In this way, when the workstation is in the loading area, the groove structure 21 can provide a limiting effect on the workpiece 3, effectively preventing the workpiece 3 from falling downward or to the inside of the annular tooling; when the workstation is in the grinding area, the main positioning surfaces 211a-211l, the auxiliary positioning surfaces 212 and the guide wheel 12 can provide a positioning effect on the workpiece 3, effectively preventing the workpiece 3 from being misaligned during the grinding process, greatly improving the positioning accuracy and grinding accuracy of the workpiece 3 during the grinding process; when the workstation is in the unloading area, the workpiece 3 can smoothly detach from the groove structure 21. The overall process of grinding the workpiece 3 is simplified, and the efficiency of processing the workpiece 3 is improved.

[0080] Further integration Figure 3b to Figure 5b , this embodiment is further optimized:

[0081] (1) The main positioning surfaces 211a-211l are perpendicular to the axis L3 and are located on the same plane. In this way, when the workpiece 3 in the different groove structures 21 is in the grinding zone, the grinding wheel 11 and the workpiece 3 have a fixed axial position, which improves the grinding accuracy when grinding a large number of workpieces 3, which is very beneficial for grinding non-cylindrical circular workpieces;

[0082] (2) The auxiliary positioning surface 212 and the auxiliary supporting surface 213 are both inclined, and when looking down at the annular sheet body 2 from above, if the annular sheet body 2 rotates in the counterclockwise direction, the auxiliary positioning surface 212 and the auxiliary supporting surface 213 are both arranged in a right-handed spiral shape; conversely, if the annular sheet body 2 rotates in the clockwise direction, the auxiliary positioning surface 212 and the auxiliary supporting surface 213 are both arranged in a left-handed spiral shape. This arrangement of the auxiliary positioning surface 212 and the auxiliary supporting surface 213 allows the tangential grinding force to generate an inclined positive pressure on the auxiliary supporting surface 213 during the grinding process. The positive pressure can be decomposed into a radial force pointing to the guide wheel 12 on the workpiece 3, so that the positive pressure between the workpiece 3 and the guide wheel 12 is greater than the positive pressure between the workpiece 3 and the grinding wheel 11, so that the rotation speed of the workpiece 3 can be adjusted by the guide wheel 12;

[0083] It should be noted that the rotation direction of the annular fixture depends on whether the grinding wheel 11 is arranged on the left side of the guide wheel 12 or on the right side of the guide wheel 12; if the grinding wheel 11 is arranged on the left side of the guide wheel 12, the annular fixture rotates counterclockwise; if the grinding wheel 11 is arranged on the right side of the guide wheel 12, the annular fixture rotates clockwise to ensure that the loading area is located above the annular fixture and the workpiece 3 can enter the grinding area from above;

[0084] Further preferably, the inclination angle α of the auxiliary positioning surface 212 is smaller than the inclination angle β of the auxiliary supporting surface 213; Figure 4bAs shown, in each station, α is the angle between the auxiliary positioning surface 212 of the station and the radial reference surface 215 of the station; β is the angle between the auxiliary support surface 213 of the station and the radial reference surface 215 of the station, and the radial reference surface 215 is the radial surface between the inner edge 2121 of the station through the auxiliary positioning surface 212 and the axis L3. Preferably, α and β satisfy: 20°≤β≤50°, 15°≤β-α≤30°. If α and β are too large, the rotation angle range of the annular tooling part in which the workpiece 3 will not fall off in the groove structure 21 will be reduced, and the number of stations in the annular sheet body 2 may be reduced, and the indexing angle from one station to the next station may be increased; and if α is too small, the workpiece 3 may be stuck in the groove structure 21, and the workpiece 3 cannot fall off smoothly in the unloading area. The preferred range of α and β in this application takes both aspects into consideration to achieve a better effect of the groove structure;

[0085] (3) Figure 3b As shown, the structures of the auxiliary support surface 213 and the auxiliary positioning surface 212 are optimized to satisfy: γ≥120°; wherein γ is the angle at which the annular tooling member can rotate when the workpiece 3 is located and held in the groove structure 21 without additional constraints;

[0086] (4) In view of the problem in the prior art that the workpiece often cannot be separated from the auxiliary support surface 213 and is over-positioned when the workpiece is in the grinding zone, this embodiment optimizes the auxiliary support surface 213 and the auxiliary positioning surface 212 to adapt to the outer diameter of the workpiece 3: Figure 3b As shown, when the outer diameter D of the workpiece 3 satisfies: 2.5mm≤D≤10mm, the auxiliary support surface 213 and the auxiliary positioning surface 212 also satisfy: R1<R2, and 0.03mm≤R2-R1≤0.10mm; wherein R1 is the radial distance between the workpiece 3 and the axis L3 when the workpiece 3 is in the loading area, and R2 is the radial distance between the workpiece 3 and the axis L3 when the workpiece 3 is in the grinding area; in this way, the auxiliary support surface 213 supports the workpiece 3 when the workpiece 3 is in the loading area, and the workpiece 3 is in the grinding area on the guide wheel 1 2, the workpiece 3 is close to the grinding wheel 11, and the positioning accuracy of the workpiece 3 is improved, so that the grinding wheel 11 can complete effective grinding, and avoid the workpiece 3 from contacting the auxiliary support surface 213 when the workpiece 3 is in the grinding area; in the grinding area, the position of the workpiece 3 should be determined by the main positioning surfaces 211a~211l, the auxiliary positioning surface 212 and the outer peripheral surface of the guide wheel 12, so as to provide accurate positioning for the grinding of the grinding wheel 11; if the auxiliary support surface 213 contacts with the workpiece 3, over-positioning or abnormal positioning will occur, so that the centerless grinding process cannot be carried out normally.

[0087] Example 3

[0088] With respect to the above-mentioned Embodiment 1 and Embodiment 2 of the present application, this embodiment further improves the shaft system layout of the driving device of the centerless grinding system and the tooling system.

[0089] Combination Figure 2a and Figure 2b As shown, the centerless grinding system also includes a grinding wheel drive device 111 and a guide wheel drive device 121. The grinding wheel drive device 111 can drive the grinding wheel 11 to rotate around the axis L1, and the guide wheel drive device 121 can drive the guide wheel 12 to rotate around the axis L2; ​​the tooling system also includes an annular tooling drive device, and the annular tooling drive device can drive the annular tooling to rotate around the axis L3; the axis L1, the axis L2 and the axis L3 constitute an inclined axis system parallel to each other, and the inclined axis system has a common normal plane 131.

[0090] The grinding wheel drive device 111 is arranged below the common normal plane 131, the guide wheel drive device 121 is arranged above the common normal plane 131, and the annular tooling drive device is arranged below the common normal plane 131; the guide wheel drive device 121 and the annular tooling drive device are all cantilevered. In this way, the axis L1, the axis L2 and the axis L3 will not interfere with each other, and the workpiece 3 can rely on gravity to lean against the main positioning surfaces 211a~211l when it is in the groove structure 21, and will not fall; considering that the axis L2 is cantilevered downward, it is difficult to replace the guide wheel 12, and the annular tooling also needs to be temporarily removed when replacing it, so a quick release mechanism is used between the box where the guide wheel 12 and the guide wheel drive device 121 are located and the machine base for positioning and connection.

[0091] During the entire grinding process, the working width of the outer peripheral surface of the grinding wheel 11 in this embodiment is only the thickness of the workpiece 3; therefore, in this embodiment, the thickness of the grinding wheel 11 is much smaller than the thickness of the grinding wheel 11 used in a traditional grinding machine, and the thickness of the guide wheel 12 is much smaller than the thickness of the guide wheel 12 used in a traditional grinding machine.

[0092] Example 4

[0093] like Figures 1 to 5c As shown, this embodiment further improves the auxiliary drive system with a flexible clamping function.

[0094] Specific as Figure 2b and Figure 3a As shown, in order to solve the problem of complex structure of the driving system required for the rotation of the workpiece 3, this embodiment proposes that the auxiliary driving system with flexible clamping function includes a magnetic device 4, which is used to asynchronously drive the workpiece 3 to rotate and provide flexible positioning of the workpiece 3 in the axial direction.

[0095] Preferably, the magnetic device 4 acts non-contactly with the workpiece 3 in the grinding zone, which, on the one hand, prevents the magnetic device 4 from affecting the rotation of the annular tooling, and on the other hand, generates an inclined rotating magnetic field, which not only generates an axial suction force on the workpiece 3, so that one end face of the workpiece 3 in the grinding zone fits together with the main positioning surfaces 211a-211l, but also generates a rotary driving force on the workpiece 3, so that the workpiece 3 can rotate in the groove structure 21, thereby realizing flexible positioning and driving of the workpiece 3. The design of the auxiliary drive system with flexible clamping function in the present application can effectively prevent the workpiece 3 from stopping its rotation and the occurrence of grinding defects on the surface of the workpiece 3 due to the friction resistance on its end face during the non-feed grinding stage.

[0096] As one of the embodiments of the magnetic device 4, the magnetic device 4 includes an end face stator, which is similar to the end face stator on an end face magnetic circuit motor. The end face stator includes an end face iron core and an end face winding wound on the end face iron core; when three-phase alternating current is passed through the end face winding, the end face stator generates a rotating magnetic field to provide a torque to the workpiece 3, and the torque overcomes the additional friction torque to make one end face of the workpiece 3 fit together with the main positioning surface 211a~211l and drive the workpiece 3 to rotate.

[0097] As another example of the magnetic device 4, the magnetic device 4 includes an end rotor, which is a permanent magnet and can be controlled to rotate. The end rotor rotates and drives the workpiece 3 to rotate. The end rotor can generate a magnetic field. When the end rotor rotates, the magnetic field also rotates and forms a rotating magnetic field. Specifically, the end rotor is connected to a mechanical drive member, and the mechanical drive member can drive the end rotor to rotate at a high speed. Under the action of the rotating magnetic field, the workpiece 3 is attached to the main positioning surfaces 211a~211l and rotates in the groove structure 21. This layout is more suitable for sheet workpieces 3 with very small outer diameters, and can also reduce the possibility of the auxiliary drive system with a flexible clamping function being corroded by the grinding coolant.

[0098] Regardless of the embodiment, as long as it provides a limiting effect in the direction of the axis L3 for the workpiece 3 in the grinding zone on the one hand, and provides a driving torque for the workpiece 3 in the grinding zone to rotate relative to the annular sheet body 2 in the groove structure 21 on the other hand, it is within the conception of the present invention.

[0099] Preferably, in any embodiment of the magnetic device 4 , the rotation speed of the workpiece 3 can be adjusted by the guide wheel 12 .

[0100] Preferably, the annular tooling piece is made of non-metallic wear-resistant insulating material so that the magnetic device 4 can effectively perform its function.

[0101] Further, such as Figure 5a to Figure 5cAs shown, in order to solve the problem of weak rigidity and easy deformation of the annular sheet body 2, the present embodiment proposes that a plurality of reinforcing ribs 22 are formed in sequence at circumferential intervals on the back side of the annular sheet body 2, and the plurality of reinforcing ribs 22 are arranged in one-to-one correspondence with the plurality of workstations; specifically, the reinforcing ribs 22 are arranged on the back side of the main positioning surfaces 211a~211l to improve the rigidity of the annular tooling parts, reduce the thickness of the structural plate surface where the main positioning surfaces 211a~211l are located, reduce the air gap between the auxiliary drive system with a flexible clamping function and the workpiece 3, and improve the flexible positioning and driving effect of the auxiliary drive system with a flexible clamping function on the workpiece 3.

[0102] Preferably, the auxiliary drive system with flexible clamping function also includes a transmission member, which is in transmission connection with the magnetic device 4; the transmission member can carry the magnetic device 4 to move axially or radially along the annular tooling part, so that the magnetic device 4 can avoid the reinforcing rib 22 during the grinding process, thereby ensuring the normal progress of the grinding process.

[0103] The improvements proposed in this embodiment can be combined with any of the embodiments 1-3.

[0104] Example 5

[0105] In order to solve the problem that the setting of the reinforcing ribs in the above-mentioned embodiment 4 of the present application requires the auxiliary driving system with a flexible clamping function to make radial or axial avoidance, this embodiment provides an embodiment in which the annular sheet body is not provided with reinforcing ribs 22.

[0106] like Figure 4a and Figure 4b As shown, in this embodiment, no reinforcing ribs 22 are provided on the back of the annular fixture, so when the annular fixture is intermittently indexed and rotated, the auxiliary drive system with a flexible clamping function does not need to make radial or axial avoidance.

[0107] The improvements proposed in this embodiment can be combined with any of the embodiments 1-3.

[0108] In summary, for sheet workpieces with smaller volume and relatively simple outer peripheral surface, the most efficient method for external cylindrical processing is the centerless grinding method; however, for sheet rotating parts with relatively small length-to-diameter ratio and millimeter-level thickness, if the currently available centerless grinding equipment is used for processing, the workpiece will produce end face swing during the grinding process, which will not only cause the workpiece to be scrapped, but may even cause serious production accidents; the present invention fills the gap that centerless grinding equipment is not suitable for sheet workpieces, and can greatly improve the processing efficiency of sheet workpieces with circular cross-sectional structures, and finds a feasible way for large-scale, high-efficiency, low-cost and high-yield processing of sheet workpieces with millimeter-level thickness, circular cross-sectional structures and non-cylindrical outer peripheral surfaces.

[0109] The exemplary embodiments of the present disclosure are specifically shown and described above. As those skilled in the art will appreciate, the various embodiments can be arbitrarily combined together without conflicts and contradictions. Further, those skilled in the art will also appreciate that the present disclosure is not limited to the detailed structures, configurations or implementations described herein, but rather, the present disclosure is intended to cover various modifications and equivalent configurations included within the spirit and scope of the appended claims.

Claims

1. A grinding device for machining a workpiece (3) having a sheet shape and a circular cross-section; characterized in that: The grinding equipment comprises: A centerless grinding system comprises a grinding wheel (11) and a guide wheel (12), wherein a grinding zone is formed between the outer peripheral surface of the grinding wheel (11) and the outer peripheral surface of the guide wheel (12); the grinding wheel (11) and the guide wheel (12) can be controlled to rotate around their respective axes, wherein the axis L1 of the grinding wheel (11) and the axis L2 of the guide wheel (12) are parallel, and the axis L1 and the axis L2 are both inclined relative to a horizontal plane (132); A tooling system, comprising an annular tooling piece, the annular tooling piece surrounds the outer periphery of the guide wheel (12), the annular tooling piece can be controlled to rotate around an axis L3, the axis L3 is parallel to the axis L1 and the axis L2 respectively, and the guide wheel (12) is eccentrically arranged relative to the annular tooling piece; The annular tooling piece comprises an annular sheet-shaped body (2), and a plurality of workstations are sequentially formed on the front side of the annular sheet-shaped body (2) at intervals in the circumferential direction; each of the workstations is provided with a main positioning surface, an auxiliary positioning surface (212) and an auxiliary supporting surface (213); the main positioning surface is formed on an annular plane of the annular sheet-shaped body (2); the auxiliary positioning surface (212) and the auxiliary supporting surface (213) are relatively arranged on both sides of the main positioning surface along the rotation direction of the annular tooling piece; the main positioning surface, the auxiliary positioning surface (212) and the auxiliary supporting surface (213) are arranged on both sides of the main positioning surface; 13) forming a groove structure (21) for movably accommodating the workpiece (3); the groove structure (21) is an open structure (214) on both sides of the rotation direction perpendicular to the axis L3, the guide wheel (12) is arranged on the inner side of the open structure (214), and the grinding wheel (11) is arranged on the outer side of the open structure (214); when the workpiece (3) rotates to the grinding area along with the annular tooling, one side of the outer peripheral surface of the workpiece (3) contacts the outer peripheral surface of the grinding wheel (11), and the other side contacts the outer peripheral surface of the guide wheel (12); An auxiliary drive system with a flexible clamping function is arranged on the back side of the annular sheet body (2). On the one hand, it provides a limiting effect in the direction of the axis L3 for the workpiece (3) in the grinding zone, and on the other hand, it provides a driving torque for the workpiece (3) in the grinding zone to rotate relative to the annular sheet body (2) in the groove structure (21).

2. The grinding device according to claim 1, characterized in that The groove structure (21) formed by the main positioning surface, the auxiliary positioning surface (212) and the auxiliary supporting surface (213) is wedge-shaped, and the circumferential width of the groove structure (21) gradually decreases from the outside to the inside along the radial direction of the annular sheet body (2).

3. The grinding device according to claim 2, characterized in that: The main positioning surface is perpendicular to the axis L3, and each of the main positioning surfaces is on the same plane; the auxiliary positioning surface (212) and the auxiliary supporting surface (213) are both inclined, and the inclination angle α of the auxiliary positioning surface (212) is smaller than the inclination angle β of the auxiliary supporting surface (213); For each of the workstations: α is the angle between the auxiliary positioning surface (212) of the workstation and the radial reference surface (215) of the workstation; β is the angle between the auxiliary supporting surface (213) of the workstation and the radial reference surface (215) of the workstation, and the radial reference surface is the radial surface between the inner edge (2121) of the auxiliary positioning surface (212) of the workstation and the axis L3.

4. The grinding device according to claim 3, characterized in that The α and β satisfy: 20°≤β≤50°, 15°≤β-α≤30°.

5. The grinding device according to claim 3, characterized in that: When looking down at the annular sheet body (2) from above, if the annular sheet body (2) rotates in a counterclockwise direction, the auxiliary positioning surface (212) and the auxiliary supporting surface (213) are both arranged in a right-hand spiral shape; conversely, if the annular sheet body (2) rotates in a clockwise direction, the auxiliary positioning surface (212) and the auxiliary supporting surface (213) are both arranged in a left-hand spiral shape.

6. The grinding device according to claim 3, characterized in that The auxiliary support surface (213) and the auxiliary positioning surface (212) satisfy: γ≥120°; Wherein, γ is the angle at which the annular tooling member can rotate when the workpiece (3) is located in and retained in the groove structure (21).

7. The grinding device according to claim 3, characterized in that A loading area is formed on one side of the outer circumference of the annular tooling piece, and a unloading area is formed on the other side of the outer circumference of the annular tooling piece; along the rotation direction of the annular tooling piece, the loading area and the unloading area are respectively located on both sides of the grinding area; When the annular tooling rotates and places the workstation in the loading area, the workpiece is put into the workstation corresponding to the annular sheet body (2) from the feeding port of the loading area, the main positioning surface provides positioning for the workpiece (3) in the direction of the axis L3, and the auxiliary positioning surface (212) and the auxiliary supporting surface (213) provide positioning for the workpiece (3) in the direction perpendicular to the axis L3; When the annular tooling member rotates and places the workstation in the grinding zone, the main positioning surface can provide positioning for the workpiece (3) in the direction of the axis L3, and the auxiliary positioning surface (212) and the guide wheel (12) provide positioning for the workpiece (3) in a direction perpendicular to the axis L3; When the annular tooling part rotates and places the workstation at the discharge port of the unloading area, the workpiece (3) at the workstation can be separated from the corresponding groove structure (21).

8. The grinding device according to claim 7, characterized in that The auxiliary support surface (213) and the auxiliary positioning surface (212) also satisfy: R1<R2, and 0.03mm≤R2-R1≤0.10mm; Wherein, R1 is the radial distance between the workpiece (3) and the axis L3 when the workpiece (3) is in the loading zone, and R2 is the radial distance between the workpiece (3) and the axis L3 when the workpiece (3) is in the grinding zone.

9. The grinding device according to any one of claims 1 to 8, characterized in that: The auxiliary drive system with a flexible clamping function comprises a magnetic device (4), which acts on the workpiece (3) in the grinding zone in a non-contact manner. The magnetic device (4) generates an inclined rotating magnetic field, thereby generating an axial suction force on the workpiece (3) and a rotational driving force on the workpiece (3), so that one end face of the workpiece (3) in the grinding zone is in contact with the main positioning surface and can rotate in the groove structure (21).

10. The grinding device according to claim 9, characterized in that The magnetic device (4) comprises an end face stator, which comprises an end face iron core and an end face winding wound on the end face iron core; when three-phase alternating current is passed through the end face winding, the end face stator generates a rotating magnetic field and drives the workpiece (3) to rotate.

11. The grinding device according to claim 9, characterized in that The magnetic device (4) comprises an end rotor, which is a permanent magnet and can be controlled to rotate. The end rotor rotates and drives the workpiece (3) to rotate.

12. The grinding device according to claim 1, characterized in that A plurality of reinforcing ribs (22) are sequentially formed at intervals in the circumferential direction on the back side of the annular sheet-like main body (2), and the plurality of reinforcing ribs (22) are arranged in one-to-one correspondence with the plurality of workstations.

13. The grinding device according to claim 12, characterized in that The auxiliary drive system with a flexible clamping function also includes a transmission member, which is in transmission connection with the magnetic device (4); the transmission member can move along the axial or radial direction of the annular tooling member with the magnetic device (4).

14. The grinding device according to claim 1, characterized in that The open structure (214) near the grinding wheel (11) is a completely open structure, and the open structure (214) near the guide wheel (12) is an incompletely open structure; along the circumference of the annular tooling part, the width of the completely open structure is greater than the width of the incompletely open structure; the completely open structure is used for loading and unloading the workpiece (3) and for the contact between the outer peripheral surface of the workpiece (3) and the outer peripheral surface of the grinding wheel (11) in the grinding area, and the incompletely open structure is used for accommodating the workpiece (3) in the groove structure (21) and for positioning the workpiece (3) in the grinding area.

15. The grinding device according to claim 1, characterized in that The axis L1, the axis L2 and the axis L3 form a mutually parallel inclined axis system, the axis L2 and the axis L3 are both cantilevered, and the inclined axis system has a common normal plane (131); The centerless grinding system further comprises a grinding wheel driving device (111) and a guide wheel driving device (121); the grinding wheel driving device (111) can drive the grinding wheel (11) to rotate, and the guide wheel driving device (121) can drive the guide wheel (12) to rotate; the grinding wheel driving device (111) is arranged below the common normal plane (131), and the guide wheel driving device (121) is arranged above the common normal plane (131); The tooling system comprises an annular tooling piece driving device, which can drive the annular tooling piece to rotate, and the annular tooling piece driving device is arranged below the common normal plane (131).

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