Center adjustable lathe fixture positioning mechanism

Abstract

The utility model relates to a center adjustable lathe fixture positioning mechanism, including flange connecting disc, is equipped with at least three groups of clamp on it along the circumferential direction, each group of clamp includes fixed base, clamping mechanism and radial positioning mechanism, the fixed end of the drive part of clamping mechanism sets up on fixed base, radial positioning mechanism includes locating block, radial adjustment subassembly and fastener, the bottom of locating block is equipped with first slip fit part, is equipped with the second slip fit part of first slip fit part sliding cooperation on fixed base, the length direction of second slip fit part is perpendicular with the adjustment direction of locating block, and the width of second slip fit part is greater than the width of first slip fit part, radial adjustment subassembly is used for adjusting the relative position of locating block and second slip fit part, fixed end is used for supporting radial adjustment subassembly, prevents adjusting after its along workpiece radial displacement, the utility model prevents the actual machining center of workpiece and lathe main shaft deviation, has improved processing quality.

Description

Technical Field

[0001] This utility model relates to the field of lathe machining technology, and in particular to a center-adjustable lathe fixture positioning mechanism. Background Technology

[0002] During turning, the workpiece is typically fixed to the lathe spindle using a fixture. The cutting tool performs straight or curved cutting on the high-speed rotating workpiece, removing material through the cutting motion to obtain the desired dimensions and surface roughness. During clamping, the workpiece center, fixture center, and lathe spindle center are aligned. For workpieces such as automotive compressor housings, due to structural asymmetry and dimensional tolerances, the workpiece center may deviate during high-speed lathe rotation. This means the actual machining center deviates from the theoretical center, reducing the coaxiality of the workpiece clamping, leading to workpiece instability and machining defects. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a center-adjustable lathe fixture positioning mechanism. The purpose is to adjust the radial position of the fixture positioning mechanism to correct the deviation of the actual machining center of the workpiece from the lathe spindle.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A center-adjustable lathe fixture positioning mechanism includes a flange connecting plate for connecting to the lathe spindle; the flange connecting plate is provided with at least three sets of fixtures along the circumferential direction, and each set of fixtures includes a fixed seat, a clamping mechanism and a radial positioning mechanism;

[0006] The clamping mechanism includes a driving member for providing clamping driving force, and the fixed end of the driving member is disposed on the fixed base;

[0007] The radial positioning mechanism comprises a positioning block, a radial adjustment component, and fasteners.

[0008] A gap is formed between the fixed end and the positioning block, which is used to accommodate the radial adjustment component;

[0009] The bottom of the positioning block is provided with a first sliding part, and the fixed seat is provided with a second sliding part that slides with the first sliding part. The length direction of the second sliding part is perpendicular to the adjustment direction of the positioning block, and the width of the second sliding part is greater than the width of the first sliding part.

[0010] The radial adjustment component is connected to the positioning block along the radial direction of the workpiece and is used to adjust the relative position of the positioning block and the second sliding part; the fastener is used to lock the positioning block on the fixed seat after the adjustment is completed, and the fixed end is used to support the radial adjustment component to prevent it from moving radially along the workpiece.

[0011] The further technical solution is as follows:

[0012] The radial adjustment assembly includes an adjusting bolt and a locking nut. The positioning block has a threaded hole that mates with the rod portion of the adjusting bolt. The adjusting bolt is used to adjust the relative position of the positioning block and the second sliding part.

[0013] The locking nut is used to lock the adjusting bolt to the positioning block;

[0014] After the relative position is adjusted, the head of the adjusting bolt is abutted by the fixed end.

[0015] The fastener is used to lock the positioning block onto the fixed seat along a direction perpendicular to the mating surface of the sliding fit.

[0016] The first sliding part is a convex slider, and the second sliding part is a concave groove.

[0017] The width of the groove is at least 1 mm larger than the width of the slider.

[0018] The clamping mechanism further includes a clamping block and a connecting pin. One end of the connecting pin is rotatably connected to the fixed end of the driving member, and the other end is rotatably connected to the middle part of the clamping block. The tail of the clamping block is rotatably connected to the output end of the driving member, and the head of the clamping block is a free end.

[0019] The driving component is a hydraulic cylinder.

[0020] The flange connection plate is also equipped with a support block.

[0021] At least one counterweight is provided on the flange connecting plate along the circumferential direction.

[0022] The lathe spindle is provided with a transition plate, and the flange connecting plate is connected to the lathe spindle through the transition plate.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention features a corresponding radial positioning mechanism on one side of the clamping mechanism of the fixture. The position of the positioning block can be adjusted via a radial adjustment component, thereby re-determining the center of the workpiece to be processed during the debugging phase and ensuring its coaxiality with the ideal machining center, i.e., the lathe spindle. It is suitable for the precise positioning and processing of workpieces with asymmetrical structures that are prone to center deviation during high-speed rotation, thus ensuring machining accuracy and improving the quality of the processed product.

[0025] This utility model's radial adjustment assembly employs an adjusting bolt and a locking nut. The adjusting bolt serves two purposes: firstly, it acts as the actuator driving the positioning block to move; secondly, after adjustment, it engages with the fixed end of the clamping mechanism's drive component, being held in place by the fixed end. This ensures the positioning block's position remains constant after positioning, preventing positional shifts due to uneven force during subsequent processing. This ensures the positional accuracy of both the radially adjusted positioning block and the workpiece.

[0026] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model.

[0028] Figure 2 This is a schematic diagram of the structure of a single clamp according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the positioning block in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the sliding groove on the fixed seat according to an embodiment of the present utility model.

[0031] Figure 5 This is a schematic diagram of the cooperation structure of the radial positioning mechanism, clamping mechanism and fixing seat in an embodiment of the present invention when the radial position of the positioning block is adjusted to a certain state.

[0032] Figure 6 This is a schematic diagram of the structure for clamping a workpiece in the working state of an embodiment of this utility model.

[0033] In the diagram: 1. Flange connecting plate; 2. Transition plate; 3. Spindle housing; 4. Workpiece; 5. Clamping mechanism; 6. Counterweight; 7. Fixed seat; 8. Positioning block; 9. Fastener; 10. Slide groove; 11. Adjusting bolt; 12. Locking nut; 13. Spacing; 14. Support block; 51. Clamping block; 52. Connecting pin; 53. Output end; 54. Hydraulic cylinder; 81. Threaded hole; 82. Slider. Detailed Implementation

[0034] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0035] See Figures 1 to 5 The center-adjustable lathe fixture positioning mechanism of this embodiment includes a flange connecting plate 1, which is used to connect with the lathe spindle; at least three sets of fixtures are provided on the flange connecting plate 1 along the circumferential direction, and the structure of each set of fixtures includes a fixed seat 7 and a clamping mechanism 5 and a radial positioning mechanism provided on the fixed seat 7.

[0036] The clamping mechanism 5 includes a drive member for providing clamping driving force, and the fixed end of the drive member is disposed on the fixed base 7;

[0037] The radial positioning mechanism consists of a positioning block 8, a radial adjustment assembly, and a fastener 9.

[0038] A gap 13 is formed between the fixed end and the positioning block 8, which is used to accommodate the radial adjustment assembly;

[0039] The bottom of the positioning block 8 is provided with a first sliding part, and the fixed seat 7 is provided with a second sliding part that slides with the first sliding part. The length direction of the second sliding part is perpendicular to the adjustment direction of the positioning block 8, and the width of the second sliding part is greater than the width of the first sliding part.

[0040] The radial adjustment assembly is connected to the positioning block 8 along the radial direction of the workpiece and is used to adjust the relative position of the positioning block 8 and the second sliding part; the fastener 9 is used to lock the positioning block 8 on the fixed seat 7 after the adjustment is completed, and the fixed end is used to support the radial adjustment assembly to prevent it from moving radially along the workpiece.

[0041] In this embodiment, the center-adjustable lathe fixture positioning mechanism uses at least three sets of fixtures to clamp the workpiece 4 onto the flange connecting plate 1. At least three positioning blocks 8 of the at least three sets of fixtures position the workpiece 4 circumferentially, aligning its center with the ideal machining center (lathe spindle). Then, the clamping mechanism 5 clamps the workpiece 4. During lathe machining, the flange connecting plate 1 rotates at high speed driven by the lathe spindle, thereby rotating the workpiece 4. When clamping asymmetrical workpieces 4, such as compressor housings, during initial debugging, the center of the workpiece 4 is aligned with the center of the lathe spindle using at least three sets of fixtures. At this time, the lathe spindle, the fixture center (the center of the circle formed by the at least three positioning blocks 8 along the circumference), and the center of the workpiece 4 coincide. However, during high-speed rotation, due to the asymmetry of the workpiece 4's structure (the side closer to the exhaust pipe is heavier), the centrifugal force is uneven, causing the center of the workpiece 4 to deviate from the ideal center (lathe spindle). At this time, based on data collected by the lathe control system, the value of the workpiece 4's deviation from the ideal center can be obtained. Based on the deviation value, the radial position of the positioning block 8 is adjusted by the radial adjustment component of the radial positioning mechanism, thereby adjusting the center of the circle formed by the at least three positioning blocks 8 around the circumference of the lathe spindle, aligning the center of the workpiece 4 with the lathe spindle, thus compensating for the aforementioned deviation value. It can be seen that after adjustment, the center of the circle formed by the at least three positioning blocks 8 around the circumference of the lathe spindle forms a certain offset from the lathe spindle, ensuring the coaxiality of the center of the workpiece 4 with the lathe spindle. After adjustment, normal machining can proceed. During machining, due to the support of the fixed end, the position of the positioning block 8 remains stable, thereby ensuring the stability of the workpiece and ultimately ensuring machining accuracy.

[0042] As a preferred method, such as Figure 2 and Figure 5 As shown, the radial adjustment assembly includes an adjusting bolt 11 and a locking nut 12. The positioning block 8 is provided with a threaded hole 81 that mates with the rod of the adjusting bolt 11. The adjusting bolt 11 is used to adjust the relative position of the positioning block 8 and the second sliding part.

[0043] The locking nut 12 is used to lock the adjusting bolt 11 to the positioning block 8.

[0044] After the relative position is adjusted, the head of the adjusting bolt 11 is abutted against the fixed end. This prevents the adjusted positioning block 8 from shifting under the centrifugal force on the workpiece 4, thus improving the stability of radial positioning.

[0045] The fastener 9 is used to lock the positioning block 8 onto the fixed seat 7 along a direction perpendicular to the mating surface of the sliding fit. The fastener 9 is preferably an M8*25 bolt.

[0046] As a preferred method, such as Figure 2As shown, the clamping mechanism 5 also includes a clamping block 51 and a connecting pin 52. One end of the connecting pin 52 is rotatably connected to the fixed end of the driving member, and the other end is rotatably connected to the middle part of the clamping block 51. The tail of the clamping block 51 is rotatably connected to the output end 53 of the driving member. The head of the clamping block 51 is a free end, which is used to clamp the workpiece 4 from the top. Correspondingly, the positioning block 8 is used to support the workpiece 4 from the bottom.

[0047] As a preferred embodiment, the driving component is a hydraulic cylinder 54.

[0048] As a preferred method, such as Figure 3 and Figure 4 As shown, the first sliding part is a convex slider 82, and the second sliding part is a concave groove 10.

[0049] like Figure 5 As shown, the width of the groove 10 is preferably at least 1 mm larger than the width of the slider 82. Wherein, the width direction is as follows... Figure 2 As indicated by the middle arrow. This direction is... Figure 1 The radial direction of the middle flange connecting plate 1. This is understandable. Figure 5 The clamping block 51 is hidden. The left end of the slider 82 is in close contact with the left side wall of the slide groove 10, with a gap between their right sides. When radial adjustment of the positioning block 8 is required, it is moved towards... Figure 5 When adjusting the right side: First, loosen the fastener 9, then loosen the locking nut 12. Adjust the position of the positioning block 8 using the adjusting bolt 11, so that the bottom slider 82 moves to the right along the slide groove 10 by the set value. Then tighten the fastener 9, and rotate the adjusting bolt 11 so that its head abuts against the side wall of the fixed end (cylinder body) of the hydraulic cylinder 54. Finally, tighten the locking nut 12 to complete the adjustment. Perform similar operations on the radial positioning mechanisms of each set of fixtures until the center of the three sets of radial positioning mechanisms is adjusted so that the center of workpiece 4 is aligned with the center of the lathe spindle. (Refer to the state of workpiece 4 being clamped during machining.) Figure 6 .

[0050] Specifically, at least one counterweight 6 is provided on the flange connecting plate 1 along the circumferential direction to maintain the dynamic balance of the flange connecting plate 1 during rotation.

[0051] Specifically, the flange connecting plate 1 is also equipped with a support block 14. It is used to assist in supporting the workpiece 4.

[0052] For details, see Figure 1 The lathe spindle is equipped with a transition plate 2, and the flange connecting plate 1 is connected to the lathe spindle through the transition plate 2. The transition plate 2 is connected to the end of the lathe spindle and is locked to the flange connecting plate 1. A spindle housing 3 is provided outside the lathe spindle.

[0053] This invention ensures processing accuracy and avoids defective products during manufacturing. It also improves production efficiency, allowing for continuous and stable processing after debugging, and eliminating the need for repeated adjustments due to unstable positioning blocks.

[0054] It will be understood by those skilled in the art that the above description is merely 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 center adjustable lathe fixture positioning mechanism, characterized by, It includes a flange connecting plate (1), which is used to connect with the lathe spindle; the flange connecting plate (1) is provided with at least three sets of clamps along the circumferential direction, and each set of clamps includes a fixed seat (7), a clamping mechanism (5) and a radial positioning mechanism; The clamping mechanism (5) includes a drive member for providing clamping driving force, and the fixed end of the drive member is disposed on the fixed base (7); The structure of the radial positioning mechanism is as follows: it includes a positioning block (8), a radial adjustment component, and a fastener (9). A gap (13) is formed between the fixed end and the positioning block (8), which is used to accommodate the radial adjustment assembly; The bottom of the positioning block (8) is provided with a first sliding part, and the fixed seat (7) is provided with a second sliding part that slides with the first sliding part. The length direction of the second sliding part is perpendicular to the adjustment direction of the positioning block (8), and the width of the second sliding part is greater than the width of the first sliding part. The radial adjustment component is connected to the positioning block (8) along the radial direction of the workpiece and is used to adjust the relative position of the positioning block (8) and the second sliding part; the fastener (9) is used to lock the positioning block (8) on the fixed seat (7) after the adjustment is completed, and the fixed end is used to support the radial adjustment component to prevent it from moving along the radial direction of the workpiece.

2. The center adjustable lathe fixture positioning mechanism of claim 1, wherein, The radial adjustment assembly includes an adjusting bolt (11) and a locking nut (12). The positioning block (8) is provided with a threaded hole (81) that mates with the rod of the adjusting bolt (11). The adjusting bolt (11) is used to adjust the relative position of the positioning block (8) and the second sliding part. The locking nut (12) is used to lock the adjusting bolt (11) to the positioning block (8); After the relative position is adjusted, the head of the adjusting bolt (11) is abutted by the fixed end.

3. The center adjustable lathe fixture positioning mechanism of claim 1, wherein, The fastener (9) is used to lock the positioning block (8) onto the fixed seat (7) along the mating surface direction perpendicular to the sliding fit.

4. The center-adjustable lathe fixture positioning mechanism according to claim 1, characterized in that, The first sliding part is a convex slider (82), and the second sliding part is a concave groove (10).

5. The center adjustable lathe fixture positioning mechanism of claim 4, wherein, The width of the groove (10) is at least 1 mm larger than the width of the slider (82).

6. The center adjustable lathe fixture positioning mechanism of claim 1, wherein, The clamping mechanism (5) further includes a clamping block (51) and a connecting pin (52). One end of the connecting pin (52) is rotatably connected to the fixed end of the driving member, and the other end is rotatably connected to the middle part of the clamping block (51). The tail of the clamping block (51) is rotatably connected to the output end (53) of the driving member, and the head of the clamping block (51) is a free end.

7. The center adjustable lathe fixture positioning mechanism of claim 1 or 6, wherein, The driving component is a hydraulic cylinder (54).

8. The center adjustable lathe fixture positioning mechanism of claim 1, wherein, The flange connecting plate (1) is also provided with a support block (14).

9. The center-adjustable lathe fixture positioning mechanism according to claim 1, characterized in that, At least one counterweight (6) is provided on the flange connecting plate (1) along the circumferential direction.

10. The center adjustable lathe fixture positioning mechanism of claim 1, wherein, The lathe spindle is provided with a transition plate (2), and the flange connecting plate (1) is connected to the lathe spindle through the transition plate (2).

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