Positioning clamp for machining clutch shaft sealing ring groove through numerical control lathe

Abstract

The utility model discloses a positioning clamp for machining a clutch shaft sealing ring groove through a numerical control lathe. The positioning clamp comprises a center body, a tailstock center, a datum plate and a transmission pin. The datum plate is provided with a first datum plane and pin holes, and the pin holes are evenly formed around the axis of the center body. The workpiece is provided with a second datum plane, connecting holes and center positioning holes, the two center positioning holes are formed in the centers of the two ends of the workpiece respectively, and the multiple connecting holes are formed around the axis of the workpiece; the datum plate is sleeved and fixed on the center body, the center body is fixedly connected with a main shaft of a lathe, and the tailstock center is arranged on a tailstock of the lathe; the center body and the tailstock center are inserted into the center positioning holes in the two ends of the workpiece respectively, and the transmission pin penetrates through the pin hole and the connecting hole. The tool compensation value can be calculated by measuring the distance between the first datum plane and the second datum plane, the correct axial machining size can be conveniently and accurately found by setting the tool compensation amount through a numerical control lathe, the clamping adjustment time is shortened, and batch machining of shaft parts is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool fixture field especially relates to a kind of positioning fixture of numerical control lathe processing clutch shaft seal ring groove. BACKGROUND

[0002] Shaft parts usually adopt the way of top center and are clamped on lathe, and this clamping method is simple and convenient, and the center positioning accuracy is high.

[0003] But in actual production, shaft parts clamped by the way of top center need to process center hole at the both ends of shaft before clamping again, but there is error in the process of processing center hole, so that the center hole taper of each shaft part has error, and further processing of shaft part will cause the problem of large axial machining size variation.

[0004] For numerical control lathe processing batch parts production, since the center hole taper of shaft part has error, shaft part needs to be aligned every time after being clamped on lathe, and then the speed of part processing is affected. UTILITY MODEL CONTENTS

[0005] In order to solve the problem that the center hole of shaft part at end exists error in batch production process, and the subsequent production efficiency is slow in the prior art, the purpose of the utility model is to provide a kind of positioning fixture of numerical control lathe processing clutch shaft seal ring groove, which has the characteristics of simple and efficient use and is suitable for the needs of batch production.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of positioning fixture of numerical control lathe processing clutch shaft seal ring groove, including top body, tailstock center, reference plate and transmission pin; first reference surface and pin hole are provided on reference plate, pin hole is uniformly arranged around the axis of top body; second reference surface, connecting hole and center positioning hole are provided on workpiece, two center positioning holes are respectively arranged at the central position of both ends of workpiece, and multiple connecting holes are arranged around the axis of workpiece; reference plate is sleeved and fixed on top body, top body is fixedly connected with the main shaft of lathe, and tailstock center is installed on tailstock of lathe; top body and tailstock center are respectively inserted into center positioning hole at both ends of workpiece, and transmission pin passes through pin hole and connecting hole.

[0007] As a preferred, top body includes first positioning part and conical part fixedly connected, mounting hole is provided on reference plate, reference plate is sleeved on first positioning part through mounting hole, reference plate is interference fit with first positioning part, and the tip of conical part (11) is inserted into center positioning hole of workpiece end.

[0008] As preferred, the top body further comprises a second positioning part, the second positioning part and the conical part are respectively arranged at two ends of the first positioning part, and an outer diameter of the second positioning part is greater than an outer diameter of the first positioning part.

[0009] As preferred, the reference plate is installed on the first positioning part of the top body in a hot-jacketed manner.

[0010] As preferred, the clamp further comprises a limiting sleeve, the limiting sleeve is sleeved on the transmission pin, and the limiting sleeve is arranged in the connecting hole of the workpiece.

[0011] As preferred, the limiting sleeve is a nylon sleeve.

[0012] As preferred, the transmission pin is installed in the pin hole of the reference plate in a press-in manner.

[0013] The technical scheme of the utility model has the advantages that: the clamp can calculate the tool compensation value by measuring the distance between the first reference surface and the second reference surface, the numerical control machine sets the tool compensation amount to conveniently find the correct axial machining size, the time for clamping and adjusting is shortened, and the processing of batch shaft parts is facilitated; the clamp can realize integrated clamping, axial positioning and transmission integrated design, and has the characteristics of simple and efficient use, and is suitable for batch production. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of the connection of the clamp and the workpiece;

[0015] Figure 2 It is a schematic view of the connection structure of the reference plate and the top body;

[0016] Figure 3 It is a schematic view of the connection structure of the reference plate and the top body Figure 2 .

[0017] Reference signs: 1, top body; 11, conical part; 12, first positioning part; 13, second positioning part; 2, reference plate; 21, pin hole; 22, first reference surface; 3, transmission pin; 4, limiting sleeve; 5, workpiece; 51, center positioning hole; 52, second reference surface; 6, tailstock center. DETAILED DESCRIPTION

[0018] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0019] In the description of the utility model, it is understood that the directions or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model in that the indicated devices or elements must have a particular orientation, construction and operation.

[0020] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0021] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. Embodiment

[0023] As Figures 1 to 3 A numerical control lathe processing clutch shaft sealing ring groove positioning fixture is shown, which comprises a tailstock center 1, a tailstock center 6, a reference plate 2 and a transmission pin 3; the reference plate 2 is provided with a first reference surface 22 and a pin hole 21, and the pin hole 21 is uniformly arranged around the axis of the tailstock center 1;

[0024] The workpiece 5 is provided with a second reference surface 52, connecting holes and center positioning holes 51, two center positioning holes 51 are respectively arranged at the central positions of the two ends of the workpiece 5, and a plurality of connecting holes are arranged around the axis of the workpiece 5;

[0025] The reference plate 2 is sleeved and fixed on the center body 1, the center body 1 is fixedly connected with the main shaft of the lathe, and the tailstock center 6 is installed on the tailstock of the lathe; the center body 1 and the tailstock center 6 are respectively inserted into the center positioning holes 51 at the two ends of the workpiece 5, and the driving pin 3 passes through the pin hole 21 and the connecting hole.

[0026] In this way, the above-mentioned clamp can calculate the tool compensation value by measuring the distance between the first reference surface 22 and the second reference surface, and the numerical control lathe can conveniently find the correct axial machining size by setting the tool compensation amount, thereby shortening the clamping adjustment time and facilitating the batch machining of shaft parts; the above-mentioned clamp can realize integrated clamping, axial positioning and transmission integration design, and has the characteristics of simple and efficient use and being suitable for batch production requirements.

[0027] In this embodiment, the center body 1 includes a first positioning part 12 and a conical part 11 fixedly connected, the reference plate 2 is provided with a mounting hole, the reference plate 2 is sleeved on the first positioning part 12 through the mounting hole, the reference plate 2 is in interference fit with the first positioning part 12, and the tip of the conical part 11 is inserted into the center positioning hole 51 at the end of the workpiece 5.

[0028] Further preferably, the center body 1 further includes a second positioning part 13, the second positioning part 13 and the conical part are respectively arranged at the two ends of the first positioning part 12, the outer diameter of the second positioning part 13 is greater than that of the first positioning part 12, the end of the second positioning part 13 can limit the movement of the reference plate 2, and the second positioning part is inserted into the chuck of the lathe and clamped by the chuck.

[0029] In this embodiment, the reference plate 2 is installed on the first positioning part 12 of the center body 1 in a hot sleeve manner, and the interference amount between the reference plate 2 and the center body 1 is between 0.01-0.025.

[0030] In this embodiment, the center body 1 is made of high carbon steel, quenched, and then coarsely and finely ground, and then artificially aged in the middle of the coarse and fine grinding to improve the high precision requirement of the center body 1; the conical part 11 of the center body 1 is a 60-degree conical circle, and the concentricity between the conical part 11, the first positioning part 12 and the second positioning part 13 is ≯0.005mm. In this way, the clamping precision of the workpiece 5 and the stability of the machining process can be effectively guaranteed.

[0031] In the embodiment, the reference plate 2 is made of medium carbon steel and is quenched and tempered; the end surface and the pin hole 21 on the reference plate 2 are ground; the pin hole 21 is perpendicular to the end surface of the reference plate 2, and the error between the two is not greater than 0.01 mm, thereby ensuring the positioning accuracy of the component.

[0032] In the embodiment, the fixture further comprises a limiting sleeve 4, the limiting sleeve 4 is sleeved on the transmission pin 3, and the limiting sleeve 4 is arranged in the connecting hole of the workpiece 5; in this way, the impact during transmission of the reference plate 2 and the workpiece 5 can be prevented. Further preferably, the limiting sleeve 4 is a nylon sleeve.

[0033] In the embodiment, the transmission pin 3 is installed in the pin hole 21 of the reference plate 2 in a manner of interference pressing. In this way, the stability of transmission between the reference plate 2 and the workpiece 5 can be effectively ensured.

[0034] In the embodiment, the reference plate 2 is provided with a plurality of pin holes 21, the inner diameters of the plurality of pin holes 21 are different, and the spacings of the plurality of pin holes 21 to the axis of the reference plate 2 are different. In this way, the machining range of the clutch shaft can be expanded by designing the transmission pin 3 holes 21 at different positions, the replacement and clamping are more convenient and fast, the production efficiency is improved, and the needs of batch production are met.

[0035] When the above fixture is used to machine the shaft workpiece 5 for the first time: first, the center body 1 of the positioning fixture is clamped on the numerical control lathe chuck, and the runout of the center body 1 is checked to be not greater than 0.008 mm; then, the center body 1 and the tailstock center 6 are respectively clamped into the center positioning holes 51 at two ends of the workpiece 5; then, the spacing between the first reference surface 22 and the second reference surface 52 is measured by using a micrometer, and the tool compensation value is calculated by using the spacing between the first reference surface 22 and the second reference surface 52; then, the tool compensation value is input into the numerical control system, and the lathe is started to machine the workpiece 5.

[0036] When the above fixture is used to machine the shaft workpiece 5 of the same specification again: after the workpiece 5 is installed on the fixture, the spacing between the first reference surface 22 and the second reference surface 52 is measured again by using an outside micrometer; then, the measured distance is compared with the measured value in the previous measurement, and finally the numerical control tool compensation parameter is adjusted.

[0037] Specifically, the numerical control lathe tool compensation should be calculated according to the difference between the actual measured distance and the previous measured distance. Wherein, when the actual measured value > previous measured value, the difference between the actual measured distance and the previous measured distance is positive, for example, the actual measured value is 30.15, the previous measured value is 30, the difference between the two is 0.15, the original numerical control lathe tool compensation W is -50.3, finally the tool compensation should be adjusted to -50.3+0.15=-50.15. Wherein, when the actual measured value < previous measured value, the difference between the actual measured distance and the previous measured distance is negative, for example, the actual measured value is 29.85, the previous measured value is 30, the difference between the two is -0.15, the original numerical control lathe tool compensation W is -50.3, finally the tool compensation should be adjusted to -50.3-0.15=-50.45.

[0038] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A positioning fixture for numerically controlled machining of a clutch shaft seal ring groove, characterized in that: The jig comprises a top center (1), a tailstock center (6), a reference plate (2) and a transmission pin (3); the reference plate (2) is provided with a first reference surface (22) and a pin hole (21), and the pin hole (21) is uniformly arranged around the axis of the top center (1); The workpiece (5) is provided with a second reference surface (52), connecting holes and center positioning holes (51), two center positioning holes (51) are respectively arranged at the central positions of the two ends of the workpiece (5), and a plurality of connecting holes are arranged around the axis of the workpiece (5); The reference plate (2) is sleeved and fixed on the top center (1), the top center (1) is fixedly connected with the main shaft of the lathe, and the tailstock center (6) is installed on the tailstock of the lathe; the top center (1) and the tailstock center (6) are respectively inserted into the center positioning holes (51) at the two ends of the workpiece (5), and the transmission pin (3) passes through the pin hole (21) and the connecting hole.

2. A positioning fixture for machining a seal ring groove of a clutch shaft according to claim 1, characterized in that: The top center (1) comprises a first positioning part (12) and a conical part (11) fixedly connected, the reference plate (2) is provided with a mounting hole, the reference plate (2) is sleeved on the first positioning part (12) through the mounting hole, the reference plate (2) is in interference fit with the first positioning part (12), and the tip of the conical part (11) is inserted into the center positioning hole (51) at the end of the workpiece (5).

3. A positioning fixture for machining a seal ring groove of a clutch shaft of a numerical control lathe according to claim 2, characterized in that: The top center (1) further comprises a second positioning part (13), the second positioning part (13) and the conical part (11) are respectively arranged at the two ends of the first positioning part (12), and the outer diameter of the second positioning part (13) is greater than that of the first positioning part (12).

4. A positioning fixture for machining a seal ring groove of a clutch shaft of a numerical control lathe according to claim 2, characterized in that: The reference plate (2) is installed on the first positioning part (12) of the top center (1) in a hot sleeve manner.

5. A positioning fixture for machining a seal ring groove of a clutch shaft of a numerical control lathe according to claim 1, characterized in that: The transmission pin (3) is installed in the pin hole (21) of the reference plate (2) in a manner of interference pressing.

6. A positioning fixture for machining a seal ring groove of a clutch shaft of a numerical control lathe according to claim 1, characterized in that: The jig further comprises a limiting sleeve (4), the limiting sleeve (4) is sleeved on the transmission pin (3), and the limiting sleeve (4) is arranged in the connecting hole of the workpiece (5).

7. A positioning fixture for machining a seal ring groove of a clutch shaft of a numerical control lathe according to claim 6, characterized in that: The limiting sleeve (4) is a nylon sleeve.

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