Workpiece eccentric hole grinding processing clamp

Abstract

This invention relates to the field of machining, specifically to a workpiece eccentric inner hole grinding fixture, comprising a cylindrical base, a first end of which is connected to a grinding machine spindle, and a second end of which has an opening communicating with a receiving chamber within the base. A positioning plate is connected to the opening. A clamping assembly for clamping the workpiece is arranged within the receiving chamber. The positioning plate has a through hole for a positioning mandrel to pass through. Manufacturing the through hole includes: fixing the base with the positioning plate connected to it onto the grinding machine spindle for grinding the eccentric inner hole of the workpiece, and machining the through hole to a preset size using a grinding tool. Workpiece clamping includes: placing the workpiece in the base, installing the positioning plate with one end face of the workpiece abutting against the side of the positioning plate, inserting the positioning mandrel through the through hole into the eccentric inner hole to be ground on the workpiece, clamping the workpiece using the clamping assembly, and removing the positioning mandrel to complete the workpiece clamping and fixing. This fixture can be used on internal grinding machines, reducing production costs while ensuring machining accuracy.

Description

Technical Field

[0001] This invention relates to the field of machining, and specifically to a fixture for grinding eccentric inner holes of workpieces. Background Technology

[0002] In the diesel engine manufacturing industry, with the continuous development of new products, the structure of parts has also changed significantly in order to meet the needs of users. Many eccentric hole-type parts have emerged. At the same time, the precision requirements of eccentric holes are very high. To ensure the precision requirements, coordinate grinding machines are usually used for processing, which forces companies to increase investment in new equipment and increase production costs. Summary of the Invention

[0003] The purpose of this invention is to provide a workpiece eccentric inner hole grinding fixture that can be used on an internal grinding machine to reduce production costs while ensuring machining accuracy.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A workpiece eccentric inner hole grinding fixture includes a cylindrical base. A first end of the base is connected to a grinding machine spindle, and a second end of the base has an opening communicating with a receiving chamber within the base. A positioning plate is connected to the opening. A clamping assembly for clamping the workpiece is arranged within the receiving chamber. The positioning plate has a through hole for a positioning mandrel to pass through. Manufacturing the through hole includes: fixing the base with the positioning plate to the grinding machine spindle for grinding the eccentric inner hole of the workpiece, and machining the through hole to a preset size using a grinding tool. Workpiece clamping includes: placing the workpiece in the base, installing the positioning plate, with one end face of the workpiece abutting against the side of the positioning plate, inserting the positioning mandrel through the through hole into the eccentric inner hole to be ground on the workpiece, clamping the workpiece using the clamping assembly, and removing the positioning mandrel to complete the workpiece clamping and fixing.

[0006] By employing the aforementioned technical means, a through hole is machined using a grinding machine, ensuring the coaxiality of the through hole and the grinding machine spindle. Subsequently, by inserting a positioning mandrel through the through hole into the eccentric inner hole to be ground on the workpiece, the coaxiality of the eccentric inner hole to be ground on the workpiece and the grinding machine spindle is ensured after the workpiece is clamped and fixed. This allows the existing conventional internal grinding machine to be used directly to grind the eccentric inner hole of the workpiece, ensuring that the machining accuracy of the eccentric inner hole meets the design requirements, while eliminating the need for an additional coordinate grinding machine, thus significantly reducing production and manufacturing costs.

[0007] Furthermore, the clamping assembly includes an eccentric sleeve, an axial push rod, and a radial pressure block. The axial push rod abuts against the side of the eccentric sleeve away from the through hole. The eccentric sleeve has a groove that matches the outer surface of the workpiece, and the edge of the eccentric sleeve has a notch that communicates with the groove. The radial pressure block is connected to the notch by a clamping screw. The clamping space between the radial pressure block and the eccentric sleeve can be adjusted by screwing the clamping screw in or out.

[0008] By employing the above-mentioned technical means, the eccentric sleeve is axially pressed against the side of the positioning plate using an axial push rod, thereby achieving axial clamping of the eccentric sleeve; the eccentric sleeve is radially clamped using an adjustable radial pressure block, which makes operation and adjustment convenient and quick, ensuring clamping efficiency.

[0009] Furthermore, the radial pressure block is pre-connected to the eccentric sleeve by a number of first axial screws.

[0010] By adopting the above-mentioned technical means, the radial pressure block is prevented from detaching from the eccentric sleeve after the clamping screw is unscrewed. Furthermore, the pre-connection ensures that the initial gap between the radial pressure block and the eccentric sleeve is not too large, reducing the amount of screw-in adjustment required for the clamping screw and improving clamping efficiency.

[0011] Furthermore, a top block is connected to the end of the axial push rod near the eccentric sleeve, and the top block corresponds to and engages with the positioning groove on the eccentric sleeve.

[0012] By adopting the above-mentioned technical means, the axial push rod can be used as a universal part, and the push block can be adapted to the workpiece positioning groove, which not only ensures the workpiece adaptability, but also reduces the cost of accessory configuration.

[0013] Furthermore, the eccentric sleeve is provided with a first positioning hole through which the first positioning pin passes, and the position of the first positioning hole corresponds to the position of the second positioning hole on the workpiece.

[0014] By employing the above-mentioned technical means, the positioning and alignment of the eccentric sleeve and the workpiece are achieved using the first locating pin, ensuring the relative positional accuracy between the eccentric sleeve and the workpiece, which is beneficial for subsequent eccentric inner hole grinding.

[0015] Furthermore, a plurality of springs are arranged between the radial pressure block and the eccentric sleeve, and the radial pressure block and the eccentric sleeve are respectively provided with a first mounting groove and a second mounting groove that correspond to and cooperate with the springs.

[0016] By employing the above-mentioned technical means, the spring plays a resetting role. When the clamping screw is unscrewed, the spring rebound helps the pressure block to reset, making it easier to remove the workpiece.

[0017] Furthermore, the first end of the substrate is fixed with a second positioning pin that corresponds to and engages with the third positioning hole on the grinding machine spindle.

[0018] By employing the above-mentioned technical means, the positioning and alignment of the base body and the grinding machine spindle are achieved using the second positioning pin, thus ensuring the relative positional accuracy between the base body and the grinding machine spindle.

[0019] Furthermore, the positioning plate is fixedly connected to the base body by a number of second axial screws.

[0020] By adopting the above-mentioned technical means, the installation of the positioning plate is stable and reliable, and the disassembly is convenient and quick, thereby improving processing efficiency.

[0021] Furthermore, the positioning plate is fixed with a third positioning pin that corresponds to and engages with the fourth positioning hole on the base.

[0022] By employing the above-mentioned technical means, the positioning alignment of the base and the positioning plate is achieved using the third positioning pin, thus ensuring the relative positional accuracy between the base and the positioning plate.

[0023] Furthermore, a positioning sleeve is fixed in the middle of the positioning plate. The inner hole of the positioning sleeve is provided to penetrate the inner and outer sides of the positioning plate, and the inner hole of the positioning sleeve serves as a through hole for the positioning mandrel to pass through.

[0024] By employing the above-mentioned technical means, the positioning requirements of positioning mandrels of different sizes can be met by grinding the inner hole of the positioning sleeve. As a result, the positioning plate can be universally designed, and different sizes of positioning mandrels can be matched by replacing the positioning sleeve, which is convenient and quick.

[0025] The beneficial effects of this invention are as follows: This invention utilizes a grinding machine to process a through hole, ensuring the coaxiality of the through hole and the grinding machine spindle. Subsequently, by inserting a positioning mandrel through the through hole into the eccentric inner hole to be ground on the workpiece, the coaxiality of the eccentric inner hole to be ground on the workpiece and the grinding machine spindle is ensured after the workpiece is clamped and fixed. Thus, the eccentric inner hole of the workpiece can be ground directly using an existing conventional internal grinding machine, ensuring that the machining accuracy of the eccentric inner hole meets the design requirements, while eliminating the need for an additional coordinate grinding machine, significantly reducing production and manufacturing costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the workpiece eccentric inner hole grinding fixture described in this invention;

[0027] Figure 2 for Figure 1 Top view;

[0028] Figure 3 for Figure 1 The right view;

[0029] Figure 4 This is a schematic diagram showing the connection between the radial pressure block and the eccentric sleeve in an embodiment of the present invention;

[0030] Figure 5This is a schematic diagram of the structure of the substrate described in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the workpiece described in an embodiment of the present invention.

[0032] In the figure, 1—base, 2—positioning plate, 3—workpiece, 31—eccentric inner hole, 32—second positioning hole, 4—positioning mandrel, 5—eccentric sleeve, 6—axial push rod, 7—radial pressure block, 8—top block, 9—positioning sleeve, 10—first axial screw, 11—second axial screw, 12—first positioning pin, 13—second positioning pin, 14—third positioning pin, 15—clamping screw, 16—spring, 17—first mounting hole, 18—second mounting hole, 19—fourth positioning hole. Detailed Implementation

[0033] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] See Figures 1 to 6As shown, this application embodiment provides a workpiece eccentric inner hole grinding fixture, including a cylindrical base 1. The first end of the base 1 is connected to the grinding machine spindle, and the second end of the base 1 has an opening communicating with a receiving chamber inside the base 1. A positioning plate 2 is fixedly connected to the opening. A clamping assembly for clamping a workpiece 3 is arranged in the receiving chamber. The positioning plate 2 has a through hole for a positioning mandrel 4 to pass through. The manufacturing of the through hole includes: fixing the base 1 with the positioning plate 2 connected to it to the grinding machine spindle for grinding the eccentric inner hole of the workpiece, and machining the through hole to a preset size using a grinding tool. The workpiece 3 clamping includes: placing the workpiece 3 in the base 1, installing the positioning plate 2, with one end face of the workpiece 3 fitting against the inner side of the positioning plate 2 under the action of the clamping assembly, inserting the positioning mandrel 4 through the through hole into the eccentric inner hole 31 of the workpiece to be ground, then tightening the clamping assembly to clamp the workpiece 3, and then removing the positioning mandrel 4 to complete the workpiece clamping and fixing. After the workpiece is clamped and fixed, the base 1 is fixed on the grinding machine spindle, and the eccentric inner hole 31 is machined to the preset size using a grinding tool.

[0036] This application utilizes a grinding machine for grinding eccentric inner holes of workpieces to process through holes, ensuring the coaxiality of the through hole and the grinding machine spindle. Subsequently, by inserting the positioning mandrel 4 through the through hole into the eccentric inner hole 31 of the workpiece 3 to be ground, the coaxiality of the eccentric inner hole 31 to be ground and the grinding machine spindle is ensured after the workpiece 3 is clamped and fixed. Thus, the eccentric inner hole 31 of the workpiece can be ground directly using an existing conventional internal grinding machine, which not only ensures that the machining accuracy of the eccentric inner hole 31 meets the design requirements, but also eliminates the need for an additional coordinate grinding machine, significantly reducing production and manufacturing costs.

[0037] In some implementations, see Figure 1 and Figure 4 As shown, the clamping assembly includes an eccentric sleeve 5, an axial push rod 6, and a radial pressure block 7. The axial push rod 6 abuts against the side of the eccentric sleeve away from the through hole. The eccentric sleeve 5 has a groove that matches the outer surface of the workpiece 3. The edge of the eccentric sleeve 5 has a notch that communicates with the groove. The radial pressure block 7 is connected to the notch by a clamping screw 15. The clamping space between the radial pressure block 7 and the eccentric sleeve 5 can be adjusted by screwing the clamping screw 15 in or out.

[0038] When clamping workpiece 3, workpiece 3 is placed in the groove of eccentric sleeve 5. By screwing in clamping screw 15, the clamping space between radial pressure block 7 and eccentric sleeve 5 is adjusted to radially clamp workpiece 3. Then, eccentric sleeve 5 with workpiece 3 is placed in the receiving cavity of base 1, positioning plate 2 is installed, and axial push rod 6 is used to axially press workpiece 3 against the positioning plate 2. This application uses axial push rod 6 to axially press eccentric sleeve 5 against the side of positioning plate 3 to achieve axial clamping of eccentric sleeve 5; and uses adjustable radial pressure block 7 to achieve radial clamping of eccentric sleeve 5. The operation and adjustment are convenient and quick, ensuring clamping efficiency.

[0039] In some implementations, see Figure 4 As shown, the radial pressure block 7 is pre-connected to the eccentric sleeve 5 by several first axial screws 10. The pre-connection effectively prevents the radial pressure block 7 from disengaging from the eccentric sleeve 5 after the clamping screw 15 is unscrewed, and the pre-connection ensures that the initial gap between the radial pressure block 7 and the eccentric sleeve 5 is not too large, reducing the amount of screwing in adjustment of the clamping screw 15 and improving clamping efficiency.

[0040] For example, there are two first axial screws 10, which are respectively connected to both sides of the radial pressure block 7 to ensure a stable and reliable connection.

[0041] In some implementations, see Figure 4 As shown, a plurality of return springs 16 are arranged between the radial pressure block 7 and the eccentric sleeve 5. The radial pressure block 7 and the eccentric sleeve 5 are respectively provided with a first mounting groove and a second mounting groove corresponding to the springs 16. For example, there are two springs 16, which are arranged close to the clamping screw 15.

[0042] Furthermore, a top block is connected to the end of the axial push rod near the eccentric sleeve, and the top block corresponds to and engages with the positioning groove on the eccentric sleeve.

[0043] By employing the above-mentioned technical means, the axial push rod can be used as a universal component, and the push block can be adaptively replaced according to the workpiece positioning groove, which not only ensures workpiece compatibility but also reduces the cost of component configuration. The spring serves a reset function; when the clamping screw is unscrewed, the spring's rebound helps the pressure block reset, facilitating workpiece removal.

[0044] In some implementations, see Figure 1 and Figure 6 As shown, the eccentric sleeve 5 is provided with a first positioning hole through which the first positioning pin 12 passes, and the first positioning hole corresponds to the second positioning hole 32 on the workpiece 3. The positioning and alignment of the eccentric sleeve 5 and the workpiece 3 are achieved by using the first positioning pin 12, which ensures the relative positional accuracy between the eccentric sleeve 5 and the workpiece 3 and facilitates the subsequent eccentric inner hole grinding process.

[0045] In some implementations, see Figure 1 , Figure 2 and Figure 5 As shown, a second locating pin 13, which corresponds to and mates with a third locating hole on the grinding machine spindle, is fixed in the second mounting hole 18 at the first end of the base 1. The second locating pin 13 is used to achieve positioning alignment between the base 1 and the grinding machine spindle, ensuring the relative positional accuracy between the base 1 and the grinding machine spindle.

[0046] In some implementations, see Figure 1 and Figure 5 As shown, the positioning plate 2 is fixed with a third positioning pin 14 that corresponds to and engages with the fourth positioning hole 19 on the base 1. The third positioning pin 14 is used to achieve the positioning alignment of the base 1 and the positioning plate 2, ensuring the relative positional accuracy between the base 1 and the positioning plate 2.

[0047] In some implementations, see Figure 1 and Figure 5 As shown, the positioning plate 2 is fixedly connected to the first mounting hole 17 on the base 1 by a plurality of second axial screws 11. The threaded connection ensures stable and reliable installation of the positioning plate 2, and facilitates convenient and quick disassembly, thus improving processing efficiency. For example, the number of second axial screws 11 is six.

[0048] In some embodiments, a positioning sleeve 9 is fixed in the middle of the positioning plate 2. The inner hole of the positioning sleeve 9 extends through the inner and outer sides of the positioning plate 2, serving as a through hole for the positioning mandrel 4 to pass through. Grinding the inner hole of the positioning sleeve 9 can meet the positioning requirements of positioning mandrels 4 of different sizes, thus enabling the positioning plate 2 to be universally designed. Replacing the positioning sleeve 9 can match positioning mandrels 4 of different sizes, which is convenient and quick.

[0049] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A fixture for grinding eccentric inner holes of workpieces, characterized in that: It includes a cylindrical base, the first end of which is connected to the grinding machine spindle, and the second end of which has an opening communicating with a receiving chamber inside the base, and a positioning plate is connected at the opening. The receiving cavity is equipped with a clamping assembly for clamping the workpiece. The positioning plate has a through hole for the positioning mandrel to pass through. The manufacturing of the through hole includes: fixing a base connected to the positioning plate to a grinding machine spindle for grinding the eccentric inner hole of the workpiece, and machining the through hole to a preset size using a grinding tool; the clamping assembly includes an eccentric sleeve, an axial push rod, and a radial pressure block. The axial push rod abuts against the side of the eccentric sleeve away from the through hole; the axial push rod is used to axially press the eccentric sleeve against the side of the positioning plate to achieve axial clamping of the eccentric sleeve; the adjustable radial pressure block is used to achieve radial clamping of the eccentric sleeve; the eccentric sleeve has a groove adapted to the outer surface of the workpiece, and the edge of the eccentric sleeve has a notch communicating with the groove. The radial pressure block is connected to the notch position by a clamping screw. By screwing the clamping screw in or out, the clamping space between the radial pressure block and the eccentric sleeve can be adjusted. The workpiece clamping process includes: placing the workpiece in the base, installing the positioning plate, aligning one end face of the workpiece with the side of the positioning plate, inserting the positioning mandrel through the through hole into the eccentric inner hole of the workpiece to be ground, clamping the workpiece with the clamping assembly, removing the positioning mandrel, and completing the workpiece clamping and fixing.

2. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The radial pressure block is pre-connected to the eccentric sleeve by several first axial screws.

3. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The end of the axial push rod near the eccentric sleeve is connected to a top block, which corresponds to and engages with the positioning groove on the eccentric sleeve.

4. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The eccentric sleeve is provided with a first positioning hole through which the first positioning pin passes, and the first positioning hole corresponds to the position of the second positioning hole on the workpiece.

5. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: Several springs are arranged between the radial pressure block and the eccentric sleeve. The radial pressure block and the eccentric sleeve are respectively provided with a first mounting groove and a second mounting groove that correspond to and cooperate with the springs.

6. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The first end of the base is fixed with a second positioning pin that corresponds to and engages with the third positioning hole on the grinding machine spindle.

7. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The positioning plate is fixedly connected to the base by a number of second axial screws.

8. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: The positioning plate is fixed with a third positioning pin that corresponds to and engages with the fourth positioning hole on the base.

9. The workpiece eccentric inner hole grinding fixture according to claim 1, characterized in that: A positioning sleeve is fixed in the middle of the positioning plate. The inner hole of the positioning sleeve is set through the inner and outer sides of the positioning plate, and the inner hole of the positioning sleeve serves as a through hole for the positioning mandrel to pass through.

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