Fixtures and compensation methods applicable to eccentricity compensation of thin-walled disk-type parts

Abstract

This invention provides a fixture and compensation method for eccentricity compensation of thin-walled disc-shaped parts. The fixture includes: a fixture F, locating pins, a turntable T, a disc workpiece W, and a clamping device Q. The locating pin includes two locating pins, denoted as locating pin M and locating pin N. The fixture F is mounted above the turntable T, the clamping device Q is located above the fixture F, and the disc workpiece W is located on the upper surface of the fixture F. The fixture F has locating pin holes, and locating pins M and N are installed in the locating pin holes. By calculating the locating pin radius and replacing the locating pins, this invention can effectively solve the problem of deviation between the pre-finished circular contour and the rotation center caused by the misalignment between the circular contour obtained from the previous process and the locating circular contour, thus ensuring the machining accuracy of the pre-finished circular contour.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing technology, specifically to a fixture and compensation method for eccentricity compensation of thin-walled disc-shaped parts. More particularly, it relates to a rapid compensation method and fixture for eccentricity between the machining outline of a thin-walled disc-shaped part and the positioning circle in mechanical manufacturing processes. Background Technology

[0002] Thin-walled disc-shaped parts typically require multiple machining processes to complete all their features. To meet the requirements for machining accuracy and efficiency, fixtures with fast and precise positioning capabilities are needed.

[0003] like Figure 2 As shown, the disc workpiece W has circular contour features A and B. Circular A is the workpiece positioning circular contour, and circular contour B is to be finished. Circular contour B is completed in the previous roughing operation. The finishing of circular contour B is performed with the workpiece positioning circle A in place. Specifically, at points M and N, locating pins with radius r0 are used to contact the workpiece positioning circle A. The disc workpiece W is mounted on a turntable, and the center of the disc, i.e., the center of the workpiece positioning circle A, is located at point O and coincides with the rotation axis of the turntable. Theoretically, the center of the contour B to be finished coincides with the center of the workpiece positioning contour A. However, due to machining errors, in reality, there is a coaxiality error, denoted as ε, between the centers of the contour B to be finished and the workpiece positioning contour A. In this case, the center of the contour B to be finished is located at O″, which deviates from the rotation center of the fixture and the turntable by ε. During the finishing of the contour B to be finished, due to the deviation ε between the center O″ of the contour B to be finished and the rotation axis of the turntable, the actual movement trajectory of each point on the contour B to be finished deviates from the theoretical trajectory, ultimately affecting the finishing accuracy of the contour B to be finished.

[0004] Patent CN110877237B discloses a compensation method based on the eccentricity between the rotation center of the grinding machine spindle and the rotation center of the workpiece. Patent CN101648217B discloses an eccentricity compensation method and equipment based on the rotation angle of the roll. Patent CN109664031B discloses an eccentricity compensation method, device, computer equipment, and storage medium. While these inventions can solve specific problems, they cannot be used for rapid compensation when there is eccentricity between the work-to-be-machined circular contour and the positioning circular contour of thin-walled disc-shaped parts. To meet the finishing requirements of the circular contour B in the above problems, a method for rapidly compensating for the deviation ε between the circular contour B and the rotation axis of the rotary table is needed.

[0005] In conclusion, there is a market need for a fixture and compensation method suitable for eccentricity compensation of thin-walled disc-type parts. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fixture and compensation method suitable for eccentricity compensation of thin-walled disk-type parts.

[0007] According to the present invention, a fixture suitable for eccentric compensation of thin-walled disk-type parts includes: a fixture F, a locating pin, a turntable T, a disk workpiece W, and a clamping device Q;

[0008] The locating pin includes two locating pins, denoted as locating pin M and locating pin N respectively;

[0009] The fixture F is mounted above the turntable T, the clamping device Q is located above the fixture F, the disc workpiece W is located on the upper surface of the fixture F, the fixture F is provided with a positioning pin hole, and the positioning pin M and the positioning pin N are installed in the positioning pin hole.

[0010] Preferably, the center of the fixture F coincides with the rotation axis of the turntable T.

[0011] Preferably, the clamping device Q, the positioning pin M, and the positioning pin N form a triangular layout and are located on the axis of symmetry of the positioning pin M and the positioning pin N.

[0012] Preferably, the disc workpiece W is located in the area formed by the positioning pin M, the positioning pin N and the clamping device Q, and is positioned by contacting the positioning pin M and the positioning pin N, and the clamping device Q clamps the positioned disc workpiece W.

[0013] Preferably, the clamping device Q is a push-type clamping device, including a clamping slider Q1, a limiting block Q2, a guide shaft Q3, a clamping spring Q4, and a guide shaft seat Q5;

[0014] The clamping slider Q1 is in sliding contact with the fixture F and is in contact with the workpiece positioning circle A of the disc workpiece W. The limiting block Q2 is located inside the clamping slider Q1 and is fixed on the fixture F. The limiting block Q2 and the clamping slider Q1 form a sliding pair. The guide shaft Q3 is fixed on the clamping slider Q1. The clamping spring Q4 is placed on the guide shaft Q3. The guide shaft seat Q5 is fixed on the upper surface of the fixture F and is clearance-fitted with the guide shaft Q3.

[0015] According to the present invention, a method for eccentricity compensation of thin-walled disk-type parts is provided, which employs the aforementioned fixture for eccentricity compensation of thin-walled disk-type parts. The compensation method includes:

[0016] Step S1: Use a coordinate measuring machine to determine the center of the circular contour to be processed and the positioning circular contour, and establish a coordinate system with the line connecting the centers as the Y-axis;

[0017] Step S2: Use the rotation center of the assembly consisting of fixture F and turntable T as the original positioning center of the outer circle contour of the disc workpiece W;

[0018] Step S3: By increasing the radius of the locating pin that contacts the locating circumference of the disc workpiece W, the center of the circular contour to be processed on the disc workpiece is moved to the rotation center of the fixture F and the turntable T, thereby achieving eccentricity compensation.

[0019] Preferably, it further includes: determining the adjustment amount of the locating pin radius based on the positional relationship between the center of the circle to be processed and the center of the locating contour under both original positioning and compensated positioning conditions, according to the coaxiality error value between the center of the circle to be processed and the center of the locating contour.

[0020] Preferably, step S3 includes:

[0021] Step S3.1: On the disc workpiece W, use a coordinate measuring machine to obtain the center O of the workpiece positioning circle contour A and the center O″ of the circle contour B to be finished.

[0022] Step S3.2: Arrange the line connecting the center O and the center O″ in the Y-axis direction of the coordinate system. The distance between them, i.e. the coaxiality error, is represented by ε.

[0023] Step S3.3: Replace all the locating pins with radius r0 in the original positioning state of the workpiece with locating pins with radius r1. The radius r1 is larger than the original radius r0. At the same time, keep the locating pins in contact with the workpiece positioning circle contour A of the disc workpiece W. This makes the entire disc workpiece W translate ε relative to the fixture F and the turntable T along the positive Y-axis. The center O″ of the circle contour B to be finished on the disc workpiece W coincides with the rotation center O of the turntable. The circle contour B to be finished moves to B′, completing the eccentricity compensation.

[0024] Preferably, the disc workpiece W is clamped on the fixture F by adjusting the radial position of the clamping device Q;

[0025] The clamping device Q clamps the workpiece by pushing or pressing.

[0026] Preferably, the adjustment amount of the locating pin radius, i.e., the calculation formula for the locating pin adjustment radius r1 used for eccentric compensation, is as follows:

[0027]

[0028] In the formula, r1 represents the adjustment radius of the locating pin, R represents the radius of the workpiece locating circle A, r0 represents the original radius of the locating pin, ε represents the deviation between the center of the workpiece locating circle contour A and the center of the circle contour B to be finished, and θ represents the angle between the locating pin and the coordinate Y axis.

[0029] The positioning pins can be prefabricated into a series of products with different adjustment radii r1 to meet the adjustment requirements of batch workpieces with different deviations ε.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This invention can effectively solve the problem of deviation between the precision-machined circular contour and the rotation center caused by the misalignment between the circular contour obtained from the previous process and the positioning circular contour by calculating the radius of the positioning pin and replacing the positioning pin, thus ensuring the machining accuracy of the precision-machined circular contour.

[0032] 2. This invention can quickly compensate for the eccentricity between the circular contour to be processed and the positioning circular contour by replacing the positioning pin of the required size, thereby improving the assembly and adjustment efficiency of the circular contour feature processing of thin-walled disc parts. Attached Figure Description

[0033] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0034] Figure 1 Three-dimensional isometric drawing of the fixture design of this invention.

[0035] Figure 2 This is a schematic diagram of the initial positioning principle of the workpiece according to the present invention;

[0036] Figure 3 This is a schematic diagram of the eccentricity compensation principle of the present invention;

[0037] Figure 4 This is a top view of the clamping device of the present invention. Detailed Implementation

[0038] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0039] According to the present invention, a fixture suitable for eccentric compensation of thin-walled disk-type parts is provided, such as... Figure 1 The fixture includes: a clamp F, locating pins, a turntable T, a disc workpiece W, and a clamping device Q. The locating pins include two pins, denoted as locating pin M and locating pin N. The clamp F is mounted above the turntable T. The center of the clamp F coincides with the rotation axis of the turntable T. The clamp F has locating pin holes, and locating pins M and N are installed in these holes. The clamping device Q is located above the clamp F, forming a triangular arrangement with locating pins M and N, and is situated on the axis of symmetry of locating pins M and N. The disc workpiece W is located on the upper surface of the clamp F.

[0040] The disc workpiece W is located within the area formed by the locating pins M and N and the clamping device Q. Positioning is achieved through contact with the locating pins M and N, and the clamping device Q clamps the positioned disc workpiece W. Specifically, the positioning of the disc workpiece W is achieved through contact between the locating pins M and N and the locating circle A of the disc workpiece. The clamping device Q is a sliding push-type clamping device, utilizing spring compression to apply clamping force to clamp the positioned disc workpiece W. The positioning and clamping process is quick and convenient. The clamping device Q can clamp the workpiece by pushing or pressing. Specifically, the pushing-type clamping device Q, such as... Figure 4 As shown, the fixture includes a clamping slider Q1, a limiting block Q2, a guide shaft Q3, a clamping spring Q4, and a guide shaft seat Q5. The clamping slider Q1 is in sliding contact with the fixture F and is in contact with the workpiece positioning circle A of the disc workpiece W. The limiting block Q2 is located inside the clamping slider Q1 and is fixed on the fixture F. The limiting block Q2 and the clamping slider Q1 form a sliding pair. The guide shaft Q3 is fixed on the clamping slider Q1. The clamping spring Q4 is placed on the guide shaft Q3. The guide shaft seat Q5 is fixed on the upper surface of the fixture F and is clearance-fitted with the guide shaft Q3.

[0041] The contact sections between the locating pins M and N and the disc workpiece W are cylindrical, with a radius of r0 or r1.

[0042] Furthermore, such as Figures 1 to 4 As shown, the fixture of the present invention for compensating for the eccentricity between the circumference of the work-to-be-machined circular contour and the positioning circular contour of thin-walled disc-shaped parts, in specific use:

[0043] Reference Figure 3 The fixture F is mounted above the turntable T, and its center is adjusted to coincide with the rotation axis of the turntable T. The fixture F has locating pin holes, into which locating pins M and N are installed. The clamping device Q is located on the upper surface of the fixture F, forming a triangular arrangement with the locating pins M and N, and is situated on the axis of symmetry of the locating pins M and N. The disc workpiece W is brought into contact with the locating pins M and N, each with a radius of r0, to achieve initial positioning. The clamping device Q then clamps the positioned disc workpiece W.

[0044] In this embodiment, if the circular contour B to be finished is concentric with the positioning circular contour A of the disc workpiece W, then no eccentricity compensation is required, that is, no replacement of the positioning pin M and the positioning pin N is required; if there is a deviation ε between the center of the circular contour B to be finished and the positioning circular contour A of the disc workpiece W in the Y direction, then the positioning pin M and the positioning pin N with a radius of r1 are replaced for eccentricity compensation, where r1 is calculated by the formula.

[0045] The contact sections between locating pins M and N and the workpiece are cylindrical. If no eccentricity compensation is required, the radius of the cylinder is r0; if eccentricity compensation is required, the radius of the cylinder is r1.

[0046] The push-type clamping device Q includes: a clamping slider Q1, a limiting block Q2, a guide shaft Q3, a clamping spring Q4, and a guide shaft seat Q5. The clamping slider Q1 slides in contact with the fixture F and contacts the workpiece positioning circle A of the disc workpiece W. The limiting block Q2 is located inside the clamping slider Q1 and fixed to the fixture F, forming a sliding pair with the clamping slider Q1. The guide shaft Q3 is fixed to the clamping slider Q1, and the clamping spring Q4 is mounted on the guide shaft Q3. The guide shaft seat Q5 is fixed to the upper surface of the fixture F, and the guide shaft seat Q5 has a clearance fit with the guide shaft Q3. Under the constraint of the limiting block Q2 and the guide shaft seat Q5, the clamping slider Q1 can only slide along the Y-axis direction.

[0047] When clamping the disc workpiece W, first push the clamping slider Q1 to move in the positive Y-axis direction, placing the disc workpiece W between the locating pins M and N and the clamping device Q, so that the workpiece locating circle A of the disc workpiece W contacts the locating pins M and N, achieving positioning. Then release the clamping slider Q1, and the clamping slider Q1 moves in the negative Y-axis direction until it contacts the workpiece locating circle A. At this time, the clamping spring Q4 is still in a compressed state. Under the action of the clamping spring Q4, the clamping slider Q1 applies a clamping force to the disc workpiece W in the negative Y-axis direction. The magnitude of the clamping force can be adjusted by changing parameters such as the diameter, pitch, or length of the clamping spring Q4.

[0048] A compensation method for an eccentricity compensation fixture for thin-walled disk-type parts, provided by the present invention, includes:

[0049] Step S1: Use a coordinate measuring machine to determine the centers of the circular contour to be processed and the positioning circular contour, and establish a coordinate system using the line connecting the centers as the Y-axis. Step S1 includes: establishing a three-dimensional coordinate system OXYZ using a turntable T, such as... Figure 1 As shown, O is the origin of the coordinate system, and the rotation axis of the turntable T is the Z-axis. The fixture F is concentrically connected to the turntable T through the origin O. The design center of the fixture F coincides with point O, and the upper surface of the fixture F lies in the OXY plane, as shown below. Figure 2 As shown, locating pins M and N are installed on the upper surface of fixture F. M and N are the center points of the locating pins. The locating pins M and N are symmetrical about the Y-axis, and the angle between them and the Y-axis is θ. The original radius of the locating pin is r0, and the adjustment radius is r1.

[0050] Step S2: The rotation center of the assembly consisting of fixture F and rotary table T is used as the original positioning center of the outer circular contour of the disc workpiece W. Specifically, the disc workpiece W has two features: a workpiece positioning circular contour A and a circular contour B to be finished. The workpiece positioning circular contour A is in contact with two positioning pins with a radius of r0 at positioning pins M and N, thus achieving the original positioning of the disc workpiece W and ensuring that the center of the workpiece positioning circular contour A coincides with the rotation center O of fixture F and rotary table T.

[0051] Step S3: By increasing the radius of the locating pin that contacts the circumference of the workpiece W, the center of the circular contour to be machined on the workpiece is moved to the rotation center of the fixture F and the turntable T, thus achieving eccentricity compensation. Specifically, the circular contour B to be machined obtained from rough machining has a coaxiality error relative to the locating circular contour A of the workpiece, that is, the circular contour B to be machined is not concentric with the locating circular contour A of the workpiece, and the center of the circular contour B to be machined is located at point O″. Figure 2 As shown, the rotation center point O is offset from the fixture and the turntable. Figure 3 As shown, step S3 includes:

[0052] Step S3.1: On the disc workpiece W, use a coordinate measuring machine to obtain the center O of the workpiece positioning circle contour A and the center O″ of the circle contour B to be finished.

[0053] Step S3.2: Arrange the line connecting the center O and the center O″ in the Y-axis direction of the coordinate system. The distance between them, i.e. the coaxiality error, is represented by ε.

[0054] Step S3.3: Replace all the locating pins with radius r0 in the original positioning state of the workpiece with locating pins with radius r1. The radius r1 is larger than the original radius r0. At the same time, keep the locating pins in contact with the workpiece positioning circle contour A of the disc workpiece W. This makes the entire disc workpiece W translate ε relative to the fixture F and the turntable T along the positive Y-axis. The center O″ of the circle contour B to be finished on the disc workpiece W coincides with the rotation center O of the turntable. The circle contour B to be finished moves to B′, completing the eccentricity compensation.

[0055] In this state, the finishing of the circular contour B′ after eccentricity compensation will not be affected by the misalignment between the workpiece positioning circular contour A and the circular contour B to be finished.

[0056] After eccentricity compensation, the disc workpiece W is translated to position W′ relative to the fixture F and the turntable T. The center of the workpiece positioning circle contour A moves from point O to point O′, and the circumference of the workpiece positioning circle contour A moves to position A′. By adjusting the radial position of the clamping device Q, the disc workpiece W is clamped on the fixture F.

[0057] The compensation method of the present invention for the eccentricity compensation fixture for thin-walled disc parts further includes: determining the adjustment amount of the locating pin radius based on the positional relationship between the center of the circle to be processed and the center of the locating contour under the two conditions of original positioning and compensation positioning, according to the coaxiality error value between the center of the circle to be processed and the center of the locating contour.

[0058] Calculation of the adjustment radius r1 of the locating pin used for eccentric compensation:

[0059] like Figure 3 As shown, under the original workpiece positioning, the center of the workpiece positioning circle contour A coincides with the rotation center O of the fixture and the turntable. The distance from the center point N of the positioning pin to the center point O of the workpiece positioning circle contour A is:

[0060] When there is a coaxiality error between the center of the circular contour B to be machined and the center of the workpiece positioning circular contour A, the deviation ε between the center of the workpiece positioning circular contour A and the center of the circular contour B to be machined is obtained by measuring with a coordinate measuring machine. The line connecting the two is made to be along the Y-axis. By adjusting the radii of the positioning pins at M and N, the center O″ of the circular contour B to be machined is moved to O, coinciding with the rotation center of the fixture and the turntable. At this time, the center of the workpiece positioning circular contour A is moved to O′, and the contour of the positioning circle A is moved to A′.

[0061] The included angle between the positions of the two locating pins M and N is a given design parameter, ∠MON=2θ.

[0062] After replacing the locating pins with radius r0 at points M and N with locating pins with radius r1, the distance from the center point N of the locating pin to the center point O' of the workpiece's locating circle contour A' is:

[0063] According to the Law of Cosines:

[0064] That is, we get:

[0065] (R+r1) 2 =(R+r0) 2 +ε 2 +2(R+r1)εcos(θ)

[0066] Furthermore, the formula for calculating the adjustment radius r1 of the locating pin is derived:

[0067]

[0068] In the formula, r1 represents the adjustment radius of the locating pin, R represents the radius of the workpiece locating circle A, r0 represents the original radius of the locating pin, ε represents the deviation between the center of the workpiece locating circle contour A and the center of the circle contour B to be finished, and θ represents the angle between the locating pin and the Y-axis.

[0069] The locating pins can be prefabricated into a series of products with different adjustment radii r1 to meet the adjustment requirements of batch workpieces with different deviations ε. Dimensions include, for example, deviations ε taking the R10 preferred number system, i.e., ε = 1.00um, 1.25um, 1.60um, 2.00um, 2.50um, 3.15um, 4.00um, 5.00um, 6.30um, 8.00um, and 10.00um. A series of corresponding r1 values ​​can be calculated according to the formula for calculating the adjustment radius r1 of the locating pin, and then locating pins with different adjustment radii r1 can be manufactured.

[0070] Based on the formula for calculating the radius r1 of the locating pin, we can calculate: or By studying the effects of changes in ε and θ on r1, the optimal value of the locating pin angle θ is determined.

[0071] Furthermore, the compensation method of the present invention for the eccentricity compensation fixture between the eccentricity of the to-be-machined circular contour and the positioning circular contour of thin-walled disk-type parts is specifically described as follows:

[0072] First, after debugging, the fixture F and the turntable T are concentrically connected. A three-dimensional coordinate system OXYZ is established with the turntable T, with O as the origin, which coincides with the design center of the fixture F. The Z-axis coincides with the rotation axis of the turntable T, and the upper surface of the fixture F is located in the OXY plane.

[0073] Then, perform the initial positioning of the disk workpiece W, such as... Figure 2 As shown, locating pins M and N with radius r0 are installed on the upper surface of fixture F. Locating pins M and N are symmetrical about the Y-axis, and the angle between them and the Y-axis is θ. θ is related to the design position of locating pins M and N.

[0074] Place the disc workpiece W on the upper surface of the fixture F, so that the workpiece positioning circle contour A of the disc workpiece W is in contact with the positioning pins M and N, thus completing the initial positioning of the disc workpiece W.

[0075] After initial positioning, the center of the workpiece positioning circle A coincides with point O. The distance between points O and N can be expressed as: Where R is the radius of the workpiece positioning circle A.

[0076] Since the circular contour B to be finished obtained from rough machining is not concentric with the workpiece positioning circular contour A, in the plane coordinate system OXY, the center of the circular contour B to be finished is located at point O″, and its deviation ε in the Y direction relative to the rotation axis of the turntable T.

[0077] Next, eccentricity compensation is performed, such as... Figure 3As shown, the locating pins with radius r0 at points M and N in the original positioning state of the workpiece are replaced with locating pins with radius r1, while maintaining the workpiece positioning circle contour A of the disc workpiece W in contact with the locating pins, thus completing the eccentricity compensation.

[0078] After eccentricity compensation, the disc workpiece W translates along the positive Y-axis to W′, the workpiece positioning circle contour A moves to A′, and the circle contour B to be finished moves to B′. The center of the workpiece positioning circle contour A moves from the original point O to point O′, and the center of the circle contour B to be finished moves from the original point O″ to point O. At this time, the distance between points O′ and N can be expressed as:

[0079] After eccentricity compensation, the center of the circular contour B′ to be finished coincides with the rotation center O of the fixture and the turntable. Under this state, the finishing of the circular contour B′ after eccentricity compensation will not be affected by the misalignment between the workpiece positioning circle and the circular contour to be finished.

[0080] The calculation of the locating pin radius r1 used for eccentric compensation is as follows:

[0081] By the Law of Cosines:

[0082]

[0083] Will and Substituting into the above equation, we get:

[0084] (R+r1) 2 =(R+r0) 2 +ε 2 +2(R+r1)εcos(θ)

[0085] From the above formula, the formula for calculating the locating pin radius r1 can be derived:

[0086]

[0087] In the above formula, R is the radius of the workpiece positioning circle A, r0 is the radius of the locating pin used for initial positioning, ε is the coaxiality error between the circle B to be finished and the workpiece positioning circle A, and in the coordinate system, the direction of the line connecting the centers of the two circles coincides with the Y-axis; θ is the angle between the orientation of the locating pin and the Y-axis. Among the above parameters, R, r0, and θ are design parameters, which can be obtained from the drawings of the disc workpiece W and the fixture F. ε is caused by the roughing of the circle B to be finished and has uncertainty. For a specific workpiece, it can be obtained by measuring with a coordinate measuring machine.

[0088] After obtaining the specific values ​​of parameters R, r0, θ, and ε, the locating pin radius r can be used as a reference. iThe formula is used to calculate the radius of the locating pin used for eccentric compensation.

[0089] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0090] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for eccentric compensation applicable to thin-walled disk-type parts, characterized in that, The compensation method is implemented using a fixture suitable for eccentric compensation of thin-walled disk-type parts. The fixture includes: fixture F, locating pin, turntable T, disk workpiece W, and clamping device Q. The locating pin includes two locating pins, denoted as locating pin M and locating pin N respectively; The fixture F is installed above the turntable T, the clamping device Q is located above the fixture F, the disc workpiece W is located on the upper surface of the fixture F, the fixture F is provided with a positioning pin hole, and the positioning pin M and the positioning pin N are installed in the positioning pin hole; The compensation method includes: Step S1: Use a coordinate measuring machine to determine the center of the circular contour to be processed and the positioning circular contour, and establish a coordinate system with the line connecting the centers as the Y-axis; Step S2: Use the rotation center of the assembly consisting of fixture F and turntable T as the original positioning center of the outer circle contour of the disc workpiece W; Step S3: By increasing the radius of the locating pin that contacts the locating circumference of the disc workpiece W, the center of the circular contour to be processed on the disc workpiece is moved to the rotation center of the fixture F and the turntable T, thereby achieving eccentricity compensation. Step S3 includes: Step S3.1: On the disc workpiece W, use a coordinate measuring machine to obtain the center of the workpiece positioning circle contour A. The center of the circle contour B to be finished ; Step S3.2: Set the center of the circle and the center The connecting lines are arranged along the Y-axis of the coordinate system, and the distance between them, i.e., the coaxiality error, is expressed as... express; Step S3.3: Position the workpiece in its original positioning state with a radius of... All locating pins have been replaced with those having a radius of [missing information]. The locating pin, the radius Compared to the original radius While maintaining contact between the locating pin and the workpiece locating circle contour A of the disc workpiece W, the entire disc workpiece W is translated relative to the fixture F and the turntable T along the positive Y-axis. The center of the circular contour B to be finished on the disc workpiece W. With turntable rotation center Overlap, the circular contour B to be finished moves to This completes the eccentricity compensation.

2. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, The center of the fixture F coincides with the rotation axis of the turntable T.

3. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, The clamping device Q, together with the positioning pins M and N, forms a triangular layout and is located on the axis of symmetry of the positioning pins M and N.

4. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, The disc workpiece W is located in the area formed by the positioning pin M, the positioning pin N and the clamping device Q. It is positioned by contacting the positioning pin M and the positioning pin N. The clamping device Q clamps the positioned disc workpiece W.

5. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, The clamping device Q is a push-type clamping device, including a clamping slider Q1, a limiting block Q2, a guide shaft Q3, a clamping spring Q4, and a guide shaft seat Q5; The clamping slider Q1 is in sliding contact with the fixture F and is in contact with the workpiece positioning circle A of the disc workpiece W. The limiting block Q2 is located inside the clamping slider Q1 and is fixed on the fixture F. The limiting block Q2 and the clamping slider Q1 form a sliding pair. The guide shaft Q3 is fixed on the clamping slider Q1. The clamping spring Q4 is placed on the guide shaft Q3. The guide shaft seat Q5 is fixed on the upper surface of the fixture F and is clearance-fitted with the guide shaft Q3.

6. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, Also includes: Based on the positional relationship between the center of the circle to be processed and the center of the positioning contour under both original positioning and compensated positioning conditions, the adjustment amount of the positioning pin radius is determined according to the coaxiality error value between the center of the circle to be processed and the center of the positioning contour.

7. The method for eccentric compensation of thin-walled disk-type parts according to claim 1, characterized in that, By adjusting the radial position of the clamping device Q, the disc workpiece W is clamped on the fixture F. The clamping device Q clamps the workpiece by pushing or pressing.

8. The method for eccentric compensation of thin-walled disk-type parts according to claim 6, characterized in that, The adjustment amount of the locating pin radius, i.e., the adjustment radius of the locating pin used for eccentric compensation. The calculation formula is as follows: In the formula, Indicates the adjustment radius of the locating pin. This represents the radius of the workpiece positioning circle A. Indicates the original radius of the locating pin. This indicates the deviation between the center of the workpiece positioning circle contour A and the circle contour B to be finished. This indicates the angle between the locating pin and the Y-axis. The positioning pins can be prefabricated to have different adjustment radii. A series of products to meet the needs of batch workpieces with different deviations The need for adjustment.

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