A high performance adjustable elastomeric bushing and methods of making and using the same

Abstract

This invention belongs to the field of precision machining technology and relates to a high-performance adjustable elastic grinding bushing and its manufacturing and usage methods. Its features include: an axial opening (2-9) on the side wall of the grinding bushing (2); a tension threaded hole (2-4) and an expansion threaded hole (2-3) are provided on one cross-section of the opening (2-9); one tension threaded hole (2-4) is provided at each end of one cross-section of the opening (2-9); the tension threaded holes (2-4) and the expansion threaded holes (2-3) are staggered and equidistantly distributed on the cross-section of the opening (2-9); and the total number of tension threaded holes (2-4) and expansion threaded holes (2-3) is an odd number not less than 3. The beneficial effects of this invention are: simple structure, high structural rigidity, adjustable radial deformation of each cross-section of the grinding bushing, convenient manufacturing and use of the bushing, improved manufacturing efficiency and efficiency of machining workpieces using the bushing, and adaptability for grinding workpieces with outer diameters slightly larger or smaller than the inner diameter of the bushing.

Description

Technical Field

[0001] This invention belongs to the field of precision machining technology, and relates to a high-performance adjustable elastic grinding bushing and its manufacturing and usage methods. Background Technology

[0002] Grinding refers to a micro-machining method that involves applying an abrasive to a grinding tool and performing micro-machining through the relative movement between the tool and the workpiece. The grinding tool is a rigid, hard tool. The abrasive removes minute amounts of material from the workpiece surface, resulting in a smooth, precision-machined surface with good dimensional accuracy. Grinding processes can be categorized into dry grinding and wet grinding based on the presence or absence of abrasive fluid. Grinding is primarily used for ultra-precision machining of surfaces composed of simple geometric elements, such as planes, cylinders, and spheres. Currently, the flatness of a plane can generally reach 0.2–0.5 μm; the roundness of a cylindrical surface can generally reach 0.2–0.5 μm, and the cylindricity can generally reach 0.5–1 μm. External diameter grinding requires a flexible bushing with an inner diameter slightly smaller than the workpiece's outer diameter, and the inner diameter dimension can be finely adjusted within a certain range.

[0003] Traditional grinding fixtures often employ a C-shaped annular bushing with one side wall completely broken off. This relies solely on the axial movement of a rigid conical ring to reduce the inner diameter, making it suitable only for grinding shaft parts with a diameter smaller than the bushing's inner diameter, and not for parts with a diameter slightly larger. Furthermore, traditional grinding bushings rely on the compression of the rigid conical ring and their own elastic deformation to establish force balance, resulting in weak rigidity and hindering high-precision grinding. The published invention patent [CN202110608291.2] proposes an elastic grinding bushing with symmetrically distributed radial deformation. The outer and inner walls of the elastic grinding bushing have the same number of U-shaped grooves of uniform depth and staggered distribution along the radial direction, which do not penetrate the wall thickness. Utilizing the uniform elastic expansion of this grinding bushing, it can be installed on workpieces with an outer diameter larger than their inner diameter for grinding. This elastic grinding bushing overcomes the shortcomings of traditional C-shaped grinding bushings, which suffer from asymmetrical radial stiffness distribution after expansion and deformation, making it difficult to guarantee the roundness of the inner diameter. However, this type of grinding bushing has problems such as high rigidity, small deformation range, strict dimensional tolerances for machined parts, and short service life. In addition, neither of the above two types of bushings has the function of adjusting or repairing the taper error of parts, which greatly limits their use. Summary of the Invention

[0004] To address the problems of existing grinding bushings, such as high rigidity, small deformation range, strict dimensional tolerances for machined parts, short service life, lack of function for adjusting or repairing taper errors, and significant limitations in application, this invention proposes: 1. A high-performance adjustable elastic grinding bushing, characterized in that: the side wall of the grinding bushing has an opening along the axial direction; each end of a cross-section of the opening has a tension threaded hole, with a tension screw installed in the tension threaded hole for tensioning the grinding bushing; an expansion threaded hole is also provided on one cross-section of the opening, with an expansion screw installed in the expansion threaded hole for expanding the grinding bushing; the total number of tension threaded holes and expansion threaded holes is an odd number not less than 3; the tension threaded holes and expansion threaded holes are staggered and equidistantly distributed on one cross-section of the opening.

[0005] The high-performance adjustable elastic grinding bushing described above is characterized in that a countersunk hole, a groove, or a fastening threaded hole is provided on the other cross-section of the opening; the countersunk hole or groove is used for the installation of the tensioning screw; and the fastening threaded hole is used for placing the expansion screw.

[0006] The high-performance adjustable elastic grinding bushing described above is characterized in that the inner wall of the grinding bushing is provided with an odd number of U-shaped grooves of uniform depth and evenly distributed along the radial direction; the minimum wall thickness t of the bottom of the U-shaped groove is 1 / 100 to 1 / 40 of the inner diameter of the grinding bushing.

[0007] The high-performance adjustable elastic grinding bushing described above is characterized in that the width b of the U-shaped groove is ≥ 0.5 mm, and the width b of the U-shaped groove is ≤ 1 / 2 of the maximum wall thickness T of the grinding bushing.

[0008] The high-performance adjustable elastic grinding bushing described above is characterized in that the grinding bushing material is ductile iron.

[0009] The high-performance adjustable elastic grinding bushing described above is characterized in that the number of U-shaped grooves on the grinding bushing is ≥4.

[0010] The manufacturing method of the high-performance adjustable elastic grinding bushing described above is characterized by the following steps:

[0011] Step 1: Use precision turning or grinding to sequentially machine the inner diameter of the bushing, the outer diameter of the bushing, and the two end faces of the bushing;

[0012] Step 2: Mill countersunk holes at equal intervals on the outer diameter of the grinding bushing;

[0013] Step 3: Machining tension threaded holes and expansion threaded holes on the three countersunk holes;

[0014] Step 4: Grind the sidewall of the bushing and machine the U-shaped groove symmetrically from the outside to the inside;

[0015] Step 5: Mill a waist-shaped hole on the outer diameter of one of the U-shaped grooves.

[0016] Step Six: Aging treatment of the grinding bushing;

[0017] Step 7: Roughly grind the inner diameter of the grinding bushing, and then install the tensioning screw and expansion screw into the corresponding threaded holes;

[0018] Step 8: Perform aging treatment on the grinding bushing again;

[0019] Step 9: Disconnect the waist-shaped hole from the side wall and the U-shaped groove to form an opening for grinding the bushing;

[0020] Step 10: Perform precision grinding on the grinding bushing until it meets the required precision.

[0021] The manufacturing method of the high-performance adjustable elastic grinding bushing is characterized by the following: in step four, the U-shaped groove and the rounded corner of the groove are processed by slow wire cutting.

[0022] The manufacturing method of the high-performance adjustable elastic grinding bushing described above is characterized in that: in step five, the distance from the bottom of the waist-shaped hole to both ends of the grinding bushing is 1-2 mm.

[0023] The method for machining workpieces using the high-performance adjustable elastic grinding bushing described above is characterized by the following steps:

[0024] When using a grinding bushing to grind parts whose outer diameter is smaller than the inner diameter of the bushing:

[0025] Step 1: Loosen the tension screws on the grinding bushing, install the grinding bushing onto the workpiece, and then tighten the tension screws with appropriate force to ensure that the tension screws on both ends of the grinding bushing are tightened to the same degree.

[0026] Step 2: Tighten the expansion screw to establish a balance between the tension and the expansion force;

[0027] Step 3: Install the workpiece onto a high-precision lathe, then install the grinding bushing onto the workpiece, start the lathe and make the workpiece rotate with the lathe spindle; hold the grinding bushing and keep it stationary, at this time the workpiece and the grinding bushing are in a relative rotational relationship.

[0028] When using a grinding bushing to grind parts whose outer diameter is larger than the inner diameter of the bushing:

[0029] Step 1: Loosen the tension screw and tighten the expansion screw to expand the grinding sleeve. Then, install the grinding sleeve onto the workpiece.

[0030] Step 2: Loosen the expansion screws to allow the inner wall of the grinding bushing to wrap around the workpiece;

[0031] Step 3: Tighten the tension screw again, and turn the expansion screw to establish a balance between the tension and expansion forces;

[0032] Step 4: Install the workpiece onto a high-precision lathe, then install the grinding bushing onto the workpiece, start the lathe and make the workpiece rotate with the lathe spindle; hold the grinding bushing and keep it stationary, at this time the workpiece and the grinding bushing are in a relative rotational relationship.

[0033] Advantages of this invention compared to existing technologies:

[0034] (1) An opening is provided on the grinding sleeve. On both sides of the opening of the grinding sleeve, there are staggered and equidistant tension threaded holes and expansion threaded holes. By adjusting the tension of the tension screw and the expansion screw, the radial deformation and axial taper of the grinding sleeve are controlled.

[0035] (2) The inner wall of the grinding bushing is provided with an odd number of U-shaped grooves of the same depth and uniformly distributed along the radial direction. By adjusting the depth of the U-shaped groove of the bushing and controlling the wall thickness of the bottom of the U-shaped groove, the radial deformation stiffness of the grinding bushing can be adjusted to meet the grinding requirements of parts with different performance.

[0036] (3) The grinding bushing has the advantages of simple structure, high structural rigidity, and adjustable radial deformation of each section. It can achieve precise adjustment of the concavity and convexity of the workpiece generatrix and the axial taper error. It can be used to grind workpieces with outer diameters greater than or less than the inner diameter of the bushing, and can also be used for workpiece installation and clamping. It has certain market prospects and application value. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a high-performance adjustable elastic grinding bushing.

[0038] Figure 2 This is a schematic diagram of the pre-processing for stress relief of a high-performance adjustable elastic grinding bushing.

[0039] Figure 3 This is a schematic diagram of grinding the outer diameter of the workpiece.

[0040] Figure 4 A grinding bushing with radially symmetrically distributed deformation of 1 opening, 5 bolts, and 7 U-shaped grooves.

[0041] Figure 5 A grinding bushing with radially symmetrically distributed deformation of 1 opening, 5 bolts, and 9 U-shaped grooves.

[0042] In the diagram: 1: Workpiece; 2: Grinding sleeve; 2-1: Grinding sleeve outer diameter; 2-2: Countersunk hole; 2-3: Expanding threaded hole; 2-4: Tightening threaded hole; 2-5: Waist groove; 2-6: Grinding sleeve inner diameter; 2-7: Grinding sleeve end face; 2-8: U-groove; Opening: 2-9; 3: Expanding screw; 4: Tightening screw. Detailed Implementation

[0043] Preferred Implementation Method 1

[0044] A high-performance adjustable elastic grinding bushing is characterized in that an opening 2-9 is provided along the axial direction on the side wall of the grinding bushing 2; a tension threaded hole 2-4 is provided at each end of one cross section of the opening 2-9, and a tension screw 4 is provided in the tension threaded hole 2-4 for tensioning the grinding bushing 2; an expansion threaded hole 2-3 is also provided on one cross section of the opening 2-9, and an expansion screw 3 is provided in the expansion threaded hole 2-3 for expanding the grinding bushing 2; the total number of tension threaded holes 2-4 and expansion threaded holes 2-3 is an odd number not less than 3; the tension threaded holes 2-4 and expansion threaded holes 2-3 are staggered and equidistantly distributed on one cross section of the opening 2-9.

[0045] On another section of the opening 2-9, there is a countersunk hole, groove or fastening threaded hole. The countersunk hole or groove is used for the installation of the tension screw 4; the fastening threaded hole is used to place the expansion screw 3. The radial deformation and axial taper of the grinding sleeve 2 are controlled by adjusting the force of the tension screw 4 and the expansion screw 3 of the grinding sleeve 2.

[0046] The inner wall of the grinding sleeve 2 is provided with an odd number of U-shaped grooves 2-8 of uniform depth and radial distribution. The minimum wall thickness t of the bottom of the U-shaped grooves 2-8 is 1 / 100 to 1 / 40 of the inner diameter of the grinding sleeve 2. By adjusting the depth of the U-shaped grooves 2-8 and controlling the wall thickness of the bottom of the U-shaped grooves 2-8, the radial deformation stiffness of the grinding sleeve 2 can be adjusted to meet the grinding requirements of parts with different performance characteristics.

[0047] The width b of the U-shaped groove 2-8 is ≥ 0.5 mm, and the width b of the U-shaped groove 2-8 is ≤ 1 / 2 of the maximum wall thickness T of the grinding sleeve 2.

[0048] The grinding bushing 2 is made of ductile iron.

[0049] The number of U-shaped grooves 2-8 on the grinding bushing 2 is ≥ 4.

[0050] The manufacturing method of the high-performance adjustable elastic grinding bushing is characterized by the following steps:

[0051] Step 1: Use precision turning or grinding to sequentially machine and grind the inner diameter 2-6, the outer diameter 2-1, and the two end faces 2-7 of the bushing;

[0052] Step 2: Mill countersunk holes 2-2 at equal intervals on the outer diameter 2-1 of the grinding bushing;

[0053] Step 3: Machining tension threaded holes 2-4 and expansion threaded holes 2-3 on the three countersunk holes 2-2;

[0054] Step 4: Grind the side wall of the bushing 2 and machine the U-shaped grooves 2-8 symmetrically from the outside to the inside;

[0055] Step 5: Mill a waist-shaped hole 2-5 on the outer diameter of one of the U-shaped grooves 2-8.

[0056] Step Six: Perform aging treatment on the grinding bushing 2;

[0057] Step 7: Roughly grind the inner diameter 2-6 of the grinding bushing, and then install the tension screw 4 and the expansion screw 3 into the corresponding threaded holes;

[0058] Step 8: Perform aging treatment on the grinding bushing 2 again;

[0059] Step 9: Disconnect the waist-shaped hole 2-5 from the side wall and the U-shaped groove 2-8 to form the opening 2-9 of the grinding sleeve 2;

[0060] Step 10: Perform precision grinding on the grinding bushing 2 until it meets the required precision.

[0061] The manufacturing method of the high-performance adjustable elastic grinding bushing is characterized in that: in step four, the U-shaped grooves 2-8 and the rounded corners of the groove openings are processed by slow wire cutting.

[0062] The manufacturing method of the high-performance adjustable elastic grinding bushing is characterized in that: in step five, the distance from the bottom of the waist-shaped hole 2-5 to the two end faces 2-7 of the grinding bushing 2 is 1-2 mm.

[0063] The method for machining workpieces using the aforementioned high-performance adjustable elastic grinding bushing is characterized by comprising the following steps:

[0064] When using grinding bushing 2 to grind parts with an outer diameter smaller than the inner diameter of the bushing by 2-6:

[0065] Step 1: Loosen the tension screw 4 on the grinding sleeve 2, install the grinding sleeve 2 onto the workpiece 1, and then tighten the tension screw 4 with appropriate force to ensure that the tension screw 4 at both ends of the grinding sleeve 2 is tightened to the same degree.

[0066] Step 2: Tighten the expansion screw 3 to establish a balance between the tension and the expansion force;

[0067] Step 3: Install workpiece 1 onto a high-precision lathe, then install the grinding sleeve 2 onto workpiece 1, start the lathe and make workpiece 1 rotate with the lathe spindle; hold the grinding sleeve 2 and keep it stationary. At this time, workpiece 1 and grinding sleeve 2 are in a relative rotational relationship.

[0068] When using grinding bushing 2 to grind parts with an outer diameter larger than the inner diameter of the bushing by 2-6:

[0069] Step 1: Loosen the tension screw 4, tighten the expansion screw 3 to expand the grinding sleeve 2, and then install the grinding sleeve 2 onto the workpiece 1;

[0070] Step 2: Loosen the expansion screw 3 so that the inner wall of the grinding sleeve 2 wraps around the workpiece 1;

[0071] Step 3: Tighten the tension screw 4 again, and turn the expansion screw 3 to establish a balance between the tension force and the expansion force;

[0072] Step 4: Install workpiece 1 onto a high-precision lathe, then install the grinding sleeve 2 onto workpiece 1, start the lathe and make workpiece 1 rotate with the lathe spindle; hold the grinding sleeve 2 and keep it stationary. At this time, workpiece 1 and grinding sleeve 2 are in a relative rotational relationship.

[0073] Preferred Implementation Method 2

[0074] Taking workpiece 1 with an outer diameter of 30.5mm as an example, this paper describes the design and manufacturing process of a high-performance adjustable elastic grinding bushing 2 and its usage method.

[0075] Generally, the diameter of shaft parts has a negative tolerance, while the inner diameter of hole parts has a positive tolerance. The inner diameter of a traditional grinding sleeve needs to be determined based on the outer diameter of the workpiece 1; however, the grinding sleeve 2 of this invention differs from traditional sleeves. The inner diameter 2-6 of the grinding sleeve can be adjusted adaptively, so the inner diameter 2-6 of the grinding sleeve can be consistent with the outer diameter of the workpiece 1. The outer diameter of the workpiece 1 is 30.48~30.50mm, therefore the inner diameter 2-6 of the grinding sleeve is also 30.48~30.50mm. The width of the U-shaped groove 2-8 on the inner wall of the grinding sleeve 2 is b1=2mm, the width of the opening 2-9 is b2=3mm, the minimum wall thickness of the bottom of the U-shaped groove 2-8 is t=1.5mm, there are a total of 5 U-shaped grooves 2-8, and one opening 2-9. The U-shaped grooves 2-8 and the opening 2-9 are evenly distributed on the side wall of the grinding sleeve 2. The length of the grinding sleeve 2 is 48mm. Figure 2 As shown.

[0076] A high-performance adjustable elastic grinding bushing 2 with the above parameters is made of ductile iron.

[0077] First, precision turning or grinding is used to process the inner diameter 2-6, outer diameter 2-1, and both end faces 2-7 of the bushing in sequence.

[0078] Then, mill three equidistant countersunk holes 2-2 on the outer diameter 2-1 of the grinding bushing;

[0079] After machining the three countersunk holes 2-2, machine the tensioning threaded hole 2-4 and the expansion threaded hole 2-3 respectively;

[0080] Then, using a slow wire cutting line, six U-shaped grooves 2-8 are symmetrically machined from the outside to the inside. The R0.5 rounded corners of the groove openings of U-shaped grooves 2-8 are also machined in one pass using a slow wire cutting line.

[0081] After the U-shaped groove 2-8 is machined, a waist-shaped groove 2-5 is milled on the outer diameter of one of the U-shaped grooves 2-8. The distance from the bottom of the waist-shaped groove 2-5 to the two end faces 2-7 of the grinding bushing is 1-2 mm.

[0082] After processing, aging treatment is required to reduce the internal stress generated during the grinding of the bushing 2.

[0083] After releasing the internal stress, the inner diameter 2-6 of the grinding bushing needs to be rough ground. After rough grinding, the tension screw 4 and the expansion screw 3 are installed into the corresponding threaded holes to ensure that the grinding bushing 2 will not deform during subsequent processing.

[0084] Then, the grinding bushing 2 is subjected to aging treatment to further reduce the internal stress caused by the rough grinding process;

[0085] After releasing the internal stress, disconnect the connection between the two ends of the waist-shaped groove 2-5 by 1-2mm to form the opening 2-9 of the grinding sleeve 2;

[0086] Finally, the grinding bushing 2 is precision ground until it meets the required precision. After the above processing is completed, the grinding bushing 2 can be used for processing and repairing the outer diameter of workpieces, etc., and has important practical applications.

[0087] A method for machining workpieces using high-performance adjustable elastic grinding bushings.

[0088] When using the grinding bushing 2 to grind workpieces with an outer diameter smaller than the inner diameter of the bushing by 2-6, first loosen the tension screw 4 on the grinding bushing 2, then install the grinding bushing 2 onto the workpiece 1, and then tighten the tension screw 4 with appropriate force to ensure that the tightening degree of the tension screws 4 at both ends is consistent. Next, tighten the expansion screw 3 to establish a balance between the tension force and the expansion force. Finally, install the grinding bushing 2 and the workpiece 1 onto a machine tool with high rotational accuracy. The workpiece 1 rotates slowly with the machine tool. Hold the grinding bushing 2 to keep the workpiece 1 and the grinding bushing 2 rotating relative to each other.

[0089] When using the grinding sleeve 2 to grind workpieces with an outer diameter larger than the inner diameter 2-6 of the sleeve, it is necessary to first loosen the tension screw 4, then tighten the expansion screw 3 to expand the grinding sleeve 2, and then install the grinding sleeve 2 onto the workpiece 1. After that, loosen the expansion screw 3 to allow the grinding sleeve 2 to naturally hold onto the workpiece 1, then tighten the tension screw 4, and finally tighten the expansion screw 3 again to establish a balance between the tension force and the expansion force. If it is necessary to control or repair the taper of the workpiece 1, the taper of the inner diameter 2-6 of the grinding sleeve can be controlled by adjusting the relationship between the tension screw 4 and the expansion screw 3 after the grinding sleeve 2 is installed on the workpiece 1. During the grinding process, in order to reduce uneven wear of the grinding sleeve 2, the speed at which the workpiece 1 moves axially back and forth on the grinding sleeve 2 and the contact opportunities between the two should be consistent.

[0090] The high-performance adjustable elastic grinding bushing disclosed in this invention has an adjustable opening structure. At the opening 2-9 of the grinding bushing 2, there are staggered and equidistantly distributed tension thread holes 2-4 and expansion thread holes 2-3 on two cross sections. Therefore, by adjusting the corresponding tension screws 4 and expansion screws 3 in the tension thread holes 2-4 and expansion thread holes 2-3, the axial taper and generatrix concavity / convexity of the workpiece 1 can be precisely adjusted. Simultaneously, U-shaped grooves 2-8 are also evenly distributed on the inner diameter 2-6 of the grinding bushing. Therefore, the radial deformation coefficients of each cross section of the grinding bushing 2 are the same and symmetrically distributed. The wall thickness (generally greater than 5mm) ensures the high axial rigidity of the grinding bushing 2. After deformation, the generatrix accuracy of the grinding bushing 2 is high, allowing for adaptable grinding of workpieces with outer diameters greater than or less than the inner diameter of the bushing. It can also be used for workpiece installation and clamping.

Claims

1. A high-performance adjustable elastic grinding bushing, characterized in that, The grinding sleeve (2) has an opening (2-9) along its axial direction on its side wall; each end of one section of the opening (2-9) is provided with a tension threaded hole (2-4), and a tension screw (4) is installed in the tension threaded hole (2-4) to tension the grinding sleeve (2); an expansion threaded hole (2-3) is also provided on one section of the opening (2-9), and an expansion screw (3) is installed in the expansion threaded hole (2-3) to expand the grinding sleeve (2); the total tension threaded hole (2-4) and expansion threaded hole (2-3) The number is an odd number of not less than 3; the tension threaded holes (2-4) and the expansion threaded holes (2-3) are staggered and equidistantly distributed on one cross section of the opening (2-9); the inner wall of the grinding sleeve (2) is provided with an odd number of U-shaped grooves (2-8) of uniform depth and evenly distributed along the radial direction; the minimum wall thickness t of the bottom of the U-shaped groove (2-8) is 1 / 100 to 1 / 40 of the inner diameter of the grinding sleeve (2); the width b of the U-shaped groove (2-8) is ≥0.5mm, and the width b of the U-shaped groove (2-8) is ≤1 / 2 of the maximum wall thickness T of the grinding sleeve (2).

2. The high-performance adjustable elastic grinding bushing as described in claim 1, characterized in that, A countersunk hole is provided on another section of the opening (2-9).

3. The high-performance adjustable elastic grinding bushing as described in claim 2, characterized in that, The grinding bushing (2) is made of ductile iron.

4. The manufacturing method of the high-performance adjustable elastic grinding bushing according to claim 3: characterized in that: Includes the following steps: Step 1: Use precision turning or grinding to sequentially machine the inner diameter (2-6), outer diameter (2-1), and both end faces (2-7) of the bushing. Step 2: Mill countersunk holes (2-2) at equal intervals on the outer diameter (2-1) of the grinding bushing; Step 3: Machining tension threaded holes (2-4) and expansion threaded holes (2-3) on the three countersunk holes (2-2); Step 4: Grind the side wall of the bushing (2) and machine the U-shaped groove (2-8) symmetrically from the outside to the inside; Step 5: Mill a waist-shaped hole (2-5) on the outer diameter of one of the U-shaped grooves (2-8). Step 6: Aging treatment of the grinding bushing (2); Step 7: Roughly grind the inner diameter (2-6) of the grinding bushing, and then install the tension screw (4) and expansion screw (3) into the corresponding threaded holes; Step 8: Perform aging treatment on the grinding bushing (2) again; Step 9: Disconnect the waist-shaped hole (2-5) from the side wall and the U-shaped groove (2-8) to form the opening (2-9) of the grinding bushing (2); Step 10: Perform precision grinding on the grinding bushing (2) until it meets the required precision.

5. The manufacturing method of the high-performance adjustable elastic grinding bushing according to claim 4: characterized in that: In step four: the U-shaped groove (2-8) and the rounded corners of the groove opening are processed by slow wire cutting.

6. The manufacturing method of the high-performance adjustable elastic grinding bushing according to claim 5: characterized in that: In step five: the distance from the bottom of the waist-shaped hole (2-5) to the two end faces (2-7) of the grinding bushing (2) is 1~2mm.

7. A method for machining workpieces using the high-performance adjustable elastic grinding bushing as described in claim 1, characterized in that: Includes the following steps: When using a grinding bushing (2) to grind parts whose outer diameter is smaller than the inner diameter (2-6) of the bushing: Step 1: Loosen the tension screw (4) on the grinding bushing (2), install the grinding bushing (2) onto the workpiece (1), and then tighten the tension screw (4) with appropriate force to ensure that the tension screws (4) on both ends of the grinding bushing (2) are tightened to the same degree. Step 2: Tighten the expansion screw (3) to establish a balance between the tension force and the expansion force; Step 3: Install the workpiece (1) onto a lathe with high rotational accuracy, and then install the grinding bushing (2) onto the workpiece (1). Start the lathe and make the workpiece (1) rotate with the lathe spindle. Hold the grinding bushing (2) in your hand and keep it stationary. At this time, the workpiece (1) and the grinding bushing (2) are in a relative rotational relationship. When using a grinding bushing (2) to grind parts whose outer diameter is larger than the inner diameter (2-6) of the bushing: Step 1: Loosen the tension screw (4), tighten the expansion screw (3) to expand the grinding sleeve (2), and then install the grinding sleeve (2) onto the workpiece (1); Step 2: Loosen the expansion screw (3) so that the inner wall of the grinding bushing (2) wraps around the workpiece (1); Step 3: Tighten the tension screw (4) again, and turn the expansion screw (3) to establish a balance between the tension force and the expansion force; Step 4: Install the workpiece (1) onto a lathe with high rotational accuracy, and then install the grinding bushing (2) onto the workpiece (1). Start the lathe and make the workpiece (1) rotate with the lathe spindle. Hold the grinding bushing (2) in your hand and keep the grinding bushing (2) stationary. At this time, the workpiece (1) and the grinding bushing (2) are in a relative rotational relationship.

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