Round cover type curved surface workpiece positioning tool

Abstract

The utility model relates to the technical field of curved surface workpiece machining, in particular to a positioning tool for machining a round cover type curved surface workpiece. In order to improve the consistency of the machining precision and batch machining precision of round cover type curved surface workpieces, the utility model provides a round cover type curved surface workpiece positioning tool which comprises a positioning shaft and a positioning seat, the positioning seat is of a conical table-shaped structure, the positioning shaft is installed on the positioning seat, and the positioning shaft is installed on the positioning seat. The central axis of the positioning shaft coincides with the central axis of the positioning seat; at least two locking pieces used for locking the round cover type curved surface workpiece to be machined are arranged on the side face of the positioning base and distributed on the same circumference. When the round cover type curved surface workpiece positioning tool is used for positioning the round cover type curved surface workpiece to be machined, the machining precision of the round cover type curved surface workpiece and the consistency of batch machining precision can be improved.

Description

Technical Field

[0001] This utility model relates to the field of curved surface workpiece processing technology, and in particular to a positioning fixture for processing round-cover-shaped curved surface workpieces. Background Technology

[0002] In such Figure 1 When machining holes 01 on the curved surface of the dome-shaped workpiece shown, the workpiece is usually mounted on a platform before machining. However, during machining, the levelness and concentricity of the workpiece cannot be guaranteed, leading to positioning deviations in the machined holes 01 and resulting in low machining accuracy. Furthermore, the repeated mounting of the dome-shaped workpiece during machining results in different mounting positions for each workpiece, leading to inconsistent machining accuracy for each workpiece in batch processing and consequently, significant variations in batch machining accuracy. Utility Model Content

[0003] To improve the machining accuracy and batch machining consistency of round-top curved surface workpieces, this utility model proposes a positioning fixture for round-top curved surface workpieces. The fixture includes a positioning shaft and a positioning seat. The positioning seat has a conical frustum structure. The positioning shaft is mounted on the positioning seat, and the central axis of the positioning shaft coincides with the central axis of the positioning seat. At least two locking elements are provided on the side of the positioning seat for locking the round-top curved surface workpiece to be machined, and these locking elements are distributed on the same circumference. When using this fixture to position a round-top curved surface workpiece, the workpiece can be placed on the positioning seat and locked in place by the locking elements distributed on the same circumference. In this way, when machining a round-top curved surface workpiece, the positioning shaft and positioning seat can be used to ensure that the center axis of the workpiece coincides with the center of the positioning shaft, guaranteeing the concentricity of different round-top curved surface workpieces in the same batch. Furthermore, locking components located on the same circumference can be used in conjunction with the positioning seat to fix the round-top curved surface workpiece on the same plane. The locking components also lock and fix the workpiece to be machined, preventing it from rotating under force during machining, which would affect machining accuracy. Therefore, using this utility model's round-top curved surface workpiece positioning fixture to position the round-top curved surface workpiece can improve the machining accuracy of the round-top curved surface workpiece and the consistency of batch machining accuracy.

[0004] Preferably, the positioning seat includes a positioning base plate and a limiting top plate. The limiting top plate and the positioning base plate are parallel to each other and fixedly mounted on the positioning shaft. The diameter of the limiting top plate is equal to the inner diameter of the workpiece to be processed (round cover-shaped curved surface), and the diameter of the positioning base plate is greater than or equal to the outer diameter of the workpiece to be processed (round cover-shaped curved surface). Thus, when the workpiece to be processed (round cover-shaped curved surface) is mounted on the positioning fixture of this invention, the workpiece is pressed against the positioning base plate, ensuring the horizontality of the workpiece. The outer edge of the limiting top plate abuts against the inner wall of the workpiece, ensuring that the central axis of the workpiece coincides with that of the limiting top plate, i.e., ensuring the concentricity of the workpiece and the limiting top plate. Further, the locking member is fixedly mounted on the outer edge surface of the positioning base plate, with the locking end of the locking member facing the limiting top plate. Thus, when using the locking device to lock the round cap-shaped curved surface workpiece to be processed, locking is simple and convenient. More preferably, the locking device includes a fixing block and a locking screw, the locking screw being installed in a locking screw hole on the fixing block along the radial direction of the positioning shaft. Thus, when using the locking device to lock the round cap-shaped curved surface workpiece to be processed, only the locking screw needs to be turned, making the operation simple and convenient.

[0005] Preferably, a plurality of locking elements are evenly distributed along the edge of the positioning base plate. Thus, when the locking elements are used to lock the workpiece in a round, curved shape, the even distribution of multiple locking elements around the workpiece ensures the locking stability of the workpiece and prevents misalignment during processing, which would affect machining accuracy.

[0006] Preferably, both the positioning base plate and the limiting top plate are provided with clearance grooves at their edges. This ensures that when machining the edge of the round-top curved workpiece, the machining position is located within the clearance groove, preventing damage to the positioning fixture during machining and thus avoiding impacts on its applicability and service life. Furthermore, the clearance groove is a V-shaped toothed groove. Using a V-shaped toothed groove as the clearance groove simplifies and facilitates machining, reducing the machining cost of the positioning fixture.

[0007] Preferably, the round-cover curved workpiece positioning fixture includes a protective top cover and a protective ring. The protective top cover is installed and fixed on the top surface of the limiting top plate away from the positioning bottom plate, and covers the free end of the positioning shaft near the limiting top plate. The protective ring is sleeved on the positioning shaft and sandwiched between the positioning bottom plate and the limiting top plate, with both ends of the protective ring connected to the positioning bottom plate and the limiting top plate, respectively. In this way, the protective top cover and protective ring protect the positioning shaft located within the round-cover curved workpiece to be processed during use, preventing damage to the positioning shaft during processing and extending the service life of the round-cover curved workpiece positioning fixture of this invention. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a round-top curved surface workpiece;

[0009] Figure 2 This is a schematic diagram of the positioning fixture for the round-cover curved surface workpiece of this utility model;

[0010] Figure 3 A schematic diagram of the structure for fixing a round-cover curved surface workpiece onto the round-cover curved surface workpiece positioning fixture of this utility model;

[0011] Figure 4 for Figure 3 A schematic diagram of the AA cross-sectional structure. Detailed Implementation

[0012] Below, in conjunction with Figures 2 to 4 This paper provides a detailed description of the positioning fixture for the round-cover curved surface workpiece of this utility model.

[0013] like Figures 2 to 4As shown, the positioning fixture for a round-covered curved surface workpiece of this utility model includes a positioning shaft 1 and a positioning seat 2. The positioning seat 2 has a conical frustum structure. The positioning shaft 1 is mounted on the positioning seat 2, and the central axis of the positioning shaft 1 coincides with the central axis of the positioning seat 2. At least two locking elements 4 for locking the round-covered curved surface workpiece 3 to be processed are provided on the side of the positioning seat 2, and the locking elements 3 are distributed on the same circumference. When positioning the round-covered curved surface workpiece 3 using the positioning fixture of this utility model, the round-covered curved surface workpiece 3 can be placed on the positioning seat 2, and the round-covered curved surface workpiece 3 can be locked and fixed by the locking elements 4 distributed on the same circumference. In this way, when machining the round-top curved surface workpiece 3, the positioning shaft 1 and the positioning seat 2 can be used to ensure that the center axis of the round-top curved surface workpiece 3 coincides with the center of the positioning shaft 1, guaranteeing the concentricity of different batches of round-top curved surface workpieces 3. Furthermore, the locking element 4, located on the same circumference, can be used in conjunction with the positioning seat 2 to fix the round-top curved surface workpiece 3 on the same plane. The locking element 4 also locks and fixes the round-top curved surface workpiece 3, preventing it from rotating under force during machining and affecting machining accuracy. Therefore, using this utility model's round-top curved surface workpiece positioning fixture to position the round-top curved surface workpiece 3 can improve the machining accuracy of the round-top curved surface workpiece 3 and the consistency of batch machining accuracy. Preferably, the positioning seat 2 includes a positioning base plate 21 and a limiting top plate 22. The limiting top plate 21 and the positioning base plate 22 are parallel to each other and are fixedly mounted on the positioning shaft 1. The diameter of the limiting top plate 22 is equal to the inner diameter of the round-shaped curved surface workpiece 3 to be processed, and the diameter of the positioning base plate 21 is greater than or equal to the outer diameter of the round-shaped curved surface workpiece 3 to be processed. In this way, when the round-shaped curved surface workpiece 3 to be processed is installed on the round-shaped curved surface workpiece positioning fixture of this utility model, the round-shaped curved surface workpiece 3 to be processed is pressed on the positioning base plate 21 to ensure the horizontality of the round-shaped curved surface workpiece 3 to be processed; the outer edge of the limiting top plate 22 abuts against the inner wall of the round-shaped curved surface workpiece 3 to be processed, ensuring that the central axis of the round-shaped curved surface workpiece 3 to be processed coincides with that of the limiting top plate 22, that is, ensuring the concentricity of the round-shaped curved surface workpiece 3 to be processed and the limiting top plate 22. Preferably, clearance grooves (211 and 221) are provided at the edges of both the positioning base plate 21 and the limiting top plate 22. This ensures that when machining the notch 31 at the edge of the round-top curved workpiece 3, the machining position is located at the clearance grooves (211 and 221), preventing damage to the round-top curved workpiece positioning fixture during machining and thus avoiding impact on its applicability and service life. Preferably, the clearance grooves (211 and 221) are V-shaped grooves. Using V-shaped grooves as clearance grooves (211 and 221) simplifies machining and reduces the machining cost of the round-top curved workpiece positioning fixture.

[0014] like Figures 2 to 4As shown, the locking element 4 is fixedly mounted on the outer edge of the positioning base plate 21, with the locking end of the locking element 4 facing the limiting top plate 22. This makes locking the round-top curved surface workpiece 3 to be processed simple and convenient. Preferably, the locking element 4 includes a fixing block 41 and a locking screw (not shown in the figure), with the locking screw installed in the locking screw hole 411 on the fixing block 41 along the radial direction of the positioning shaft 1. Thus, when locking the round-top curved surface workpiece 3 to be processed using the locking element 4, only the locking screw needs to be turned. After processing, the round-top curved surface workpiece can be removed simply by turning the locking screw, eliminating the need for a positioning fixture for the round-top curved surface workpiece, making operation simple and convenient, and thus improving the processing efficiency of the round-top curved surface workpiece. Preferably, multiple locking elements 4 are evenly distributed along the edge of the positioning base plate 21. In this way, when the locking element 4 is used to lock the workpiece 3 of the round cover shape to be processed, the multiple locking elements 4 are evenly distributed around the workpiece 3 of the round cover shape to be processed, which can ensure the locking stability of the workpiece 3 of the round cover shape to be processed and avoid the workpiece 3 of the round cover shape to be processed being misaligned due to force during processing, thus affecting the processing accuracy.

[0015] like Figures 2 to 4 As shown, the positioning fixture for the round-cover curved surface workpiece of this utility model also includes a protective top cover 5 and a protective ring 6. The protective top cover 5 is installed and fixed on the top surface of the limiting top plate 22 facing away from the positioning bottom plate 21, and the protective top cover 5 covers the free end of the positioning shaft 1 near the limiting top plate 21. The protective ring 6 is sleeved on the positioning shaft 1 and clamped between the positioning bottom plate 21 and the limiting top plate 22, and both ends of the protective ring 6 are connected to the positioning bottom plate 21 and the limiting top plate 22 respectively. In this way, the protective top cover 5 and the protective ring 6 protect the positioning shaft 1 located inside the round-cover curved surface workpiece 3 to be processed during use, avoid damage to the positioning shaft 1 during processing, and extend the service life of the positioning fixture for the round-cover curved surface workpiece of this utility model. Preferably, the protective top cover 5 is composed of a protective top ring 51 and a protective top plate 52, which has a simple structure, is easy to manufacture, and can further reduce the production cost of the round-cover curved surface workpiece of this utility model.

Claims

1. A positioning fixture for a round-cap-shaped curved surface workpiece, characterized in that, The positioning fixture for the round-cover-shaped curved surface workpiece includes a positioning shaft and a positioning seat. The positioning seat has a conical frustum structure. The positioning shaft is mounted on the positioning seat, and the central axis of the positioning shaft coincides with the central axis of the positioning seat. The side of the positioning seat is provided with locking components for locking the round-cover-shaped curved surface workpiece to be processed, and the locking components are distributed on the same circumference.

2. The positioning fixture for a round-covered curved surface workpiece according to claim 1, characterized in that, The positioning seat includes a positioning base plate and a limiting top plate. The limiting top plate and the positioning base plate are parallel to each other and are fixed on the positioning shaft. The diameter of the limiting top plate is equal to the inner diameter of the round-shaped curved surface workpiece to be processed, and the diameter of the positioning base plate is greater than or equal to the outer diameter of the round-shaped curved surface workpiece to be processed.

3. The positioning fixture for a round-covered curved surface workpiece according to claim 2, characterized in that, The locking member is installed and fixed on the outer edge surface of the positioning base plate, and the locking end of the locking member faces the limiting top plate.

4. The positioning fixture for a round-covered curved surface workpiece according to claim 3, characterized in that, The locking component includes a fixing block and a locking screw, wherein the locking screw is installed in a locking screw hole on the fixing block along the radial direction of the positioning shaft.

5. The positioning fixture for a round-covered curved surface workpiece according to claim 2 or 3, characterized in that, The locking elements are evenly distributed along the edge of the positioning base plate.

6. The positioning fixture for a round-covered curved surface workpiece according to any one of claims 2-4, characterized in that, Both the positioning base plate and the limiting top plate are provided with clearance grooves at their edges.

7. The positioning fixture for a round-covered curved surface workpiece according to claim 6, characterized in that, The clearance groove is a V-shaped toothed groove.

8. The positioning fixture for a round-covered curved surface workpiece according to any one of claims 2-4, characterized in that, The circular-cover curved workpiece positioning fixture includes a protective top cover and a protective ring. The protective top cover is installed and fixed on the top surface of the limiting top plate away from the positioning bottom plate, and the protective top cover covers the free end of the positioning shaft near the limiting top plate. The protective ring is sleeved on the positioning shaft and sandwiched between the positioning bottom plate and the limiting top plate, and both ends of the protective ring are respectively connected to the positioning bottom plate and the limiting top plate.

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