Numerically controlled lathe expanding sleeve hydraulic clamp

Abstract

The utility model discloses a numerical control lathe expansion sleeve hydraulic clamp relates to clamp technical field, including fixedly connected in the machining table top surface outer ring, along the even spacing of multiple sector blocks that are arranged in the circumference of outer ring inner wall, multiple sector blocks enclose the center and are equipped with ladder platform shape compression ring in the containing groove, the top surface of sector block is equipped with the top surface slope for contacting with expansion sleeve inner wall, the inner wall of sector block is equipped with the side slope of adapting with compression ring waist line, when compression ring is driven to move down by expansion sleeve, through the cooperation of side slope drives multiple sector blocks to move inwards radially synchronously. The utility model discloses a top surface slope is set up on the top surface of sector block, and sector block encloses a torus, and the sleeve joint of expansion sleeve is convenient, and the expansion sleeve extrudes sector block and moves down when sleeve joint, when sector block moves down, the torus of sector block encloses will contract into the torus of smaller diameter, and it is convenient to sleeve joint to the expansion sleeve of different diameter.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a hydraulic clamping fixture for CNC lathe expansion sleeve. Background Technology

[0002] In the field of machining, expansion sleeves are a general term for cylindrical and sleeve-like parts. When machining expansion sleeves on a CNC lathe, the performance of the fixture directly determines the positioning accuracy and machining quality of the workpiece. Machining expansion sleeves places high demands on the stability and precision of their clamping.

[0003] For specific expansion sleeves produced in batches, dedicated internal expansion or external clamping fixtures are designed and manufactured. Although these fixtures offer high precision, their structure is usually tailor-made for a single product or very similar products, lacking versatility. When the expansion sleeve size changes, the inner diameter or length of the sleeve will change, requiring the redesign and manufacture of the entire fixture or most of the fixture components. This results in high production costs, long preparation cycles, and difficulty in meeting the flexible production needs of small batches and multiple varieties in modern manufacturing. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic clamping fixture for CNC lathe expansion sleeves, so as to solve the problem mentioned in the background art that the existing expansion sleeve clamping fixtures are difficult to adapt to when the inner diameter of the expansion sleeve changes when the expansion sleeve size is changed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic clamping fixture for expanding sleeves on a CNC lathe, comprising a machining table for supporting the expanding sleeves, wherein the top surface of the machining table is provided with a radial expansion mechanism, an axial pressing mechanism, and a lateral positioning device;

[0006] The radial expansion mechanism includes an outer ring fixedly connected to the top surface of the processing table, and multiple equally spaced sector-shaped blocks evenly arranged along the circumference of the inner wall of the outer ring. A trapezoidal pressure ring is provided in the central receiving groove formed by the multiple sector-shaped blocks. The top surface of each sector-shaped block is provided with a top surface slope for contacting the inner wall of the expansion sleeve, and the inner wall of each sector-shaped block is provided with a side slope adapted to the side waistline of the pressure ring. When the pressure ring is driven downward by the expansion sleeve, the multiple sector-shaped blocks are driven to move radially inward synchronously through the cooperation of the side slope, thereby causing the ring formed by the top surface slope to expand and tighten inside the expansion sleeve.

[0007] The axial clamping mechanism includes a clamping element for clamping the expansion sleeve against the top surface of the processing table from above;

[0008] The lateral positioning device includes an abutment device for auxiliary positioning of the expansion sleeve from the side.

[0009] Preferably, the radial tensioning mechanism further includes a support plate fixed to the top surface of the processing table, a plurality of damping springs arrayed on the top surface of the support plate and along its center, and a bearing plate fixedly connected to the top of all the damping springs; the sector block is disposed on the bearing plate.

[0010] Preferably, the bottom surface of the sector block is provided with a sliding groove, and the top surface of the bearing plate is fixedly connected with a limiting block that slides with the sliding groove.

[0011] Preferably, the bottom end of the pressure ring passes through the bearing plate and the support plate and is fixedly connected to the top surface of the processing table.

[0012] Preferably, the clamping component includes a base fixedly connected to the processing table, a vertical plate fixedly connected to the top surface of the base, a rotating plate rotatably connected to the top of the vertical plate, and a hydraulic cylinder installed inside the base; the output end of the hydraulic cylinder is rotatably connected to one end of the rotating plate to drive the other end of the rotating plate to press down or lift up.

[0013] Preferably, the rotating plate has a cavity inside, and a retractable extension plate is slidably connected inside the cavity. A threaded rod is fixedly connected to the end of the extension plate, and a wing nut is threaded onto the threaded rod. The wing nut is rotatably connected to the end of the rotating plate away from the vertical plate.

[0014] Preferably, the abutting device includes a fixed base fixedly connected to the processing table, and an abutting bolt threaded to the top of the fixed base.

[0015] The technical effects and advantages of this utility model are as follows: By setting a top surface slope on the top surface of the sector block, the sector block forms a ring, which facilitates the fitting of the expansion sleeve. At the same time, when the expansion sleeve is fitted, it squeezes the sector block to move downward. When the sector block moves downward, the ring formed by the sector will shrink into a ring with a smaller diameter, which makes it easier to fit expansion sleeves of different diameters. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a partial structural schematic diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the pressure ring structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the support plate part of this utility model.

[0020] Figure 5 This is a schematic diagram of the sector-shaped block structure of this utility model.

[0021] Figure 6This is a schematic diagram of the clamping component structure of this utility model.

[0022] Figure 7 This is a schematic diagram of the abutment device of this utility model.

[0023] In the diagram: 1. Expansion sleeve; 2. Machining table; 3. Clamping component; 31. Base; 32. Vertical plate; 33. Rotating plate; 34. Hydraulic cylinder; 35. Extension plate; 36. Threaded rod; 37. Wing nut; 4. Abutment device; 41. Fixed seat; 42. Abutment bolt; 5. Outer ring; 6. Sector block; 61. Top surface slope; 62. Side slope; 64. Slide groove; 7. Pressure ring; 8. Support plate; 9. Damping spring; 10. Bearing plate; 11. Limiting block. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model provides, for example Figure 1-7 The CNC lathe expansion sleeve hydraulic fixture shown includes a machining table 2 for supporting the expansion sleeve 1. The top surface of the machining table 2 is provided with a radial expansion mechanism, an axial pressing mechanism, and a lateral positioning device.

[0026] The radial expansion mechanism includes an outer ring 5 fixedly connected to the top surface of the processing table 2, and multiple equally spaced sector blocks 6 evenly arranged along the inner circumference of the outer ring 5. A trapezoidal pressure ring 7 is provided in the central receiving groove formed by the multiple sector blocks 6. The top surface of the sector blocks 6 is provided with a top surface slope 61 for contacting the inner wall of the expansion sleeve 1, and the inner wall of the sector blocks 6 is provided with a side slope 62 adapted to the waistline of the inclined side of the pressure ring 7. When the pressure ring 7 is driven downward by the expansion sleeve 1, it drives the multiple sector blocks 6 to move radially inward synchronously through the cooperation of the side slope 62, thereby expanding the ring formed by the top surface slope 61 into the inside of the expansion sleeve 1.

[0027] The axial clamping mechanism includes a clamping member 3 for pressing the expansion sleeve 1 against the top surface of the processing table 2 from above;

[0028] The lateral positioning device includes an abutment device 4 for auxiliary positioning of the expansion sleeve 1 from the side.

[0029] This invention uses the processing table 2 as the base platform for the entire fixture. During operation, the expansion sleeve 1 to be fixed is first placed on the processing table 2, so that it fits over the virtual ring formed by the top slope 61 of multiple sector blocks 6. At this time, the expansion sleeve 1 is pressed down, driving the sector blocks 6 downwards. The expansion sleeve 1 contacts the top slope 61 of the sector block 6 and generates an interaction force. This force from the slope is decomposed into a radially inward component, thereby forcing all sector blocks 6 to move synchronously and equally inwards along the waistline of the pressure ring 7 on the same circumference. Ultimately, this causes the outer wall of the sector blocks 6 to tightly adhere to the inner wall of the expansion sleeve 1, fundamentally limiting the radial sway of the expansion sleeve 1.

[0030] At the same time, the axial clamping mechanism applies a vertically downward pressure from above the expansion sleeve 1, firmly pressing it against the top surface of the processing table 2 to prevent axial movement. Furthermore, the lateral positioning device can position the expansion sleeve 1 from the side, preventing it from rotating with the processing machine during processing.

[0031] The synergistic effect of radial expansion, axial compression, and lateral positioning mechanisms ensures ultra-high positioning accuracy and stability of the workpiece during processing.

[0032] like Figure 4 and Figure 5 As shown, the radial expansion mechanism also includes a support plate 8 fixed to the top surface of the processing table 2, a plurality of damping springs 9 arranged in an array on the top surface of the support plate 8 and along its center, and a bearing plate 10 fixedly connected to the top of all the damping springs 9; the sector block 6 is disposed on the bearing plate 10.

[0033] The support plate 8 is fixed to the processing table 2, providing support for the entire radial expansion mechanism. Multiple damping springs 9 are arranged in an array between the support plate 8 and the bearing plate 10. In its natural state, the damping springs 9 lift the bearing plate 10 and the sector blocks 6 on it. When the expansion sleeve 1 is pressed down, the damping springs 9 are compressed, and the restoring force of the damping springs 9 pushes the bearing plate 10 and the sector blocks 6 back to their original positions. This causes the outer wall of the sector blocks 6 to be pushed to the inner wall of the expansion sleeve 1 under the action of the damping springs 9. The ramp 61 on the top surface of the sector blocks 6 facilitates the fitting of expansion sleeves 1 with different inner wall sizes.

[0034] like Figure 4 and Figure 5 As shown, the bottom surface of the sector block 6 is provided with a sliding groove 64, and the top surface of the bearing plate 10 is fixedly connected with a limiting block 11 that slides in cooperation with the sliding groove 64.

[0035] When the sector block 6 is pressed down by the expansion sleeve 1, the side slope 62 of the sector block 6 will contract along the waistline of the pressure ring 7. When the sector block 6 contracts, the slide groove 64 will move along the square of the limit block 11 to prevent multiple sector blocks 6 from not forming a circle, which would cause the inner wall of the sector block 6 to not fit completely with the inner wall of the expansion sleeve 1, resulting in the expansion sleeve 1 shaking.

[0036] like Figure 2 , Figure 3 and Figure 4 As shown, the bottom end of the pressure ring 7 passes through the bearing plate 10 and the support plate 8 and is fixedly connected to the top surface of the processing table 2. The main function of the pressure ring 7 is to add a limit to the sector block 6 in the radial direction to prevent the sector block 6 from falling off the processing table 2.

[0037] like Figure 6 As shown, the clamping component 3 includes a base 31 fixedly connected to the processing table 2, a vertical plate 32 fixedly connected to the top surface of the base 31, a rotating plate 33 rotatably connected to the top of the vertical plate 32, and a hydraulic cylinder 34 installed inside the base 31; the output end of the hydraulic cylinder 34 is rotatably connected to one end of the rotating plate 33 to drive the other end of the rotating plate 33 to press down or lift up.

[0038] like Figure 6 As shown, the rotating plate 33 has a cavity inside, and a retractable extension plate 35 is slidably connected inside the cavity. A threaded rod 36 is fixedly connected to the end of the extension plate 35, and a wing nut 37 is threaded onto the threaded rod 36. The wing nut 37 is rotatably connected to the end of the rotating plate 33 away from the vertical plate 32.

[0039] When clamping, the piston rod of the hydraulic cylinder 34 extends, pushing the rotating plate 33 to rotate downwards with its hinge point with the vertical plate 32 as the center. The rotating plate 33 presses down, and the pressure is applied to the top of the expansion sleeve 1 through the extension plate 35 at its end. When it is necessary to adjust the clamping position, the wing nut 37 can be loosened, and the extension length of the extension plate 35 can be slid to adjust the extension sleeve 1 of different diameters. After adjustment, the wing nut 37 can be tightened again to lock it. Through the design of the telescopic extension plate 35, a single clamping component 3 can cover a wide range of diameters, further enhancing the versatility of the entire fixture.

[0040] like Figure 7 As shown, the abutting device 4 includes a fixed base 41 fixedly connected to the processing table 2, and an abutting bolt 42 threadedly connected to the top of the fixed base 41;

[0041] When initially placing the expansion sleeve 1, the abutment bolt 42 can be rotated in advance so that its end gently contacts the outer wall of the expansion sleeve 1 to pre-position the expansion sleeve 1, ensuring that its center is roughly aligned with the rotation center of the fixture. Finally, it is locked to prevent the expansion sleeve 1 from rotating with the processing device during processing.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic clamping fixture for a CNC lathe, comprising a machining table (2) for supporting the expansion sleeve (1), characterized in that: The top surface of the processing table (2) is provided with a radial expansion mechanism, an axial pressing mechanism, and a lateral positioning device; The radial expansion mechanism includes an outer ring (5) fixedly connected to the top surface of the processing table (2), and a plurality of equally spaced fan-shaped blocks (6) evenly arranged along the inner wall of the outer ring (5). A trapezoidal pressure ring (7) is provided in the central receiving groove formed by the plurality of fan-shaped blocks (6). The top surface of the fan-shaped block (6) is provided with a top surface slope (61) for contacting the inner wall of the expansion sleeve (1), and the inner wall of the fan-shaped block (6) is provided with a side slope (62) adapted to the waistline of the side of the pressure ring (7). When the pressure ring (7) is driven downward by the expansion sleeve (1), the plurality of fan-shaped blocks (6) are driven to move radially inward synchronously through the cooperation of the side slope (62), so that the ring formed by the top surface slope (61) is expanded and tightened inside the expansion sleeve (1). The axial clamping mechanism includes a clamping element (3) for clamping the expansion sleeve (1) onto the top surface of the processing table (2) from above the expansion sleeve (1). The lateral positioning device includes an abutment device (4) for auxiliary positioning of the expansion sleeve (1) from the side.

2. The CNC lathe expansion sleeve hydraulic clamp according to claim 1, characterized in that: The radial expansion mechanism also includes a support plate (8) fixed to the top surface of the processing table (2), a plurality of damping springs (9) arranged on the top surface of the support plate (8) and along its center, and a bearing plate (10) fixedly connected to the top of all the damping springs (9), and the fan-shaped block (6) is disposed on the bearing plate (10).

3. A hydraulic clamping fixture for expanding sleeves on a CNC lathe according to claim 2, characterized in that: The bottom surface of the sector block (6) is provided with a sliding groove (64), and the top surface of the bearing plate (10) is fixedly connected with a limiting block (11) that slides in cooperation with the sliding groove (64).

4. A hydraulic clamping fixture for expanding sleeves on a CNC lathe according to claim 3, characterized in that: The bottom end of the pressure ring (7) passes through the bearing plate (10) and the support plate (8) and is fixedly connected to the top surface of the processing table (2).

5. A hydraulic clamping fixture for expanding sleeves on a CNC lathe according to claim 1, characterized in that: The clamping component (3) includes a base (31) fixedly connected to the processing table (2), a vertical plate (32) fixedly connected to the top surface of the base (31), a rotating plate (33) rotatably connected to the top of the vertical plate (32), and a hydraulic cylinder (34) installed inside the base (31); the output end of the hydraulic cylinder (34) is rotatably connected to one end of the rotating plate (33) to drive the other end of the rotating plate (33) to press down or lift up.

6. A hydraulic clamping fixture for expanding sleeves on a CNC lathe according to claim 5, characterized in that: The rotating plate (33) has a cavity inside, and a retractable extension plate (35) is slidably connected inside the cavity. A threaded rod (36) is fixedly connected to the end of the extension plate (35). A wing nut (37) is threaded onto the threaded rod (36). The wing nut (37) is rotatably connected to the end of the rotating plate (33) away from the vertical plate (32).

7. A hydraulic clamping fixture for expanding sleeves on a CNC lathe according to claim 1, characterized in that: The abutting device (4) includes a fixed base (41) fixedly connected to the processing table (2) and an abutting bolt (42) threaded to the top of the fixed base (41).

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