Self-positioning eccentric hole tool for lathe

Abstract

The utility model discloses a self-positioning eccentric hole tool for a lathe, which comprises a tool disc, a fixing block, a first adjusting screw, a first fastening screw, a positioning pin, a cutter holder, a pressing plate, a second fastening screw and a second adjusting screw. The cutter holder is fastened on the tool disc through a pressing plate by using a second screwing fastening screw and can rotate along with the tool disc. Two positioning pin holes are formed in the tool disc, and positioning pins are arranged in the positioning pin holes; a fixing block is arranged above the cutter holder, a first adjusting screw is arranged on the fixing block, and the fixing block is fixed to the tool disc through a first fastening screw. According to the utility model, the scribing process is omitted, the quick clamping efficiency is high, and the machining quality is obviously improved; and the tool can be clamped only by adjusting the center of the clamp to be coaxial with the center of a machine tool at a time, and the tool can work only by screwing a fastening screw in the machining process.

Description

Technical Field

[0001] The utility model relates to a mechanical processing eccentric hole tool, in particular to a self-positioning eccentric hole tool for a lathe, belonging to the technical field of machinery. Background Art

[0002] When boring shield machine products and cutting cutter seat through holes of φ41, the conventional processing method is that the fitter marks the processing position first, punches holes and marks, aligns the inner hole according to the fitter's markings, uses the front and rear planes as the processing reference, and inserts the center hole of the machine tool boring bar to calibrate the workpiece so that the center of the workpiece through hole coincides with the center of the machine tool to process the φ41 hole. This processing method requires two corrections, which is time-consuming and labor-intensive, and the boring machine has great limitations. Due to manual feeding, and the inability to feed continuously, it is difficult to remove iron chips, so that the surface roughness of the processed inner hole is very high, and the product quality is unstable. It is not only expensive, but also has a long cycle. The workpiece is difficult to process on the boring machine, affecting the production progress. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a self-positioning eccentric hole special tooling for a lathe to meet the machining accuracy requirements of the eccentric hole turning in view of the defects of the prior art.

[0004] To solve this technical problem, the utility model provides a self-positioning eccentric hole tooling for a lathe, comprising a tooling disk, a fixing block, an adjusting screw 1, a fastening screw 1, a positioning pin, a cutter seat, a pressure plate, a fastening screw 2 and an adjusting screw 2. One end of the cutter seat is provided with a convex edge, and the cutter seat is fastened to the tooling disk by the pressure plate by tightening the fastening screw 2 and can rotate with the tooling disk; two positioning pin holes are provided on the tooling disk, and the positioning pins are arranged in the positioning pin holes; a fixing block is provided above the cutter seat, and an adjusting screw 1 is provided on the fixing block, and the fixing block is fixed to the tooling disk by the fastening screw 1.

[0005] The tooling disc is in the shape of a disc and is provided with a central inner hole. A groove matching the cutter seat is milled on one end surface of the inner hole, and the cutter seat is placed in the groove.

[0006] The positioning pin and the positioning pin hole of the tooling plate are transitionally matched, and the positioning pin can automatically center the cutter seat.

[0007] Beneficial effects: The eccentric error of the present utility model can be controlled within ±0.01 mm. The positioning pin can make the cutter holder of the cutting tool achieve automatic centering, and the machining accuracy requirements for turning eccentric holes can be met without calibration. The present utility model eliminates the scribing process, has high processing efficiency with quick clamping, and significantly improves the machining quality; it has strong versatility, and for eccentric holes whose outer shape can be placed into the tooling hole for machining, workpieces within a certain range can be turned; only one-time adjustment is required to make the center of the fixture coaxial with the center of the machine tool when clamping this tooling, and only by turning the fastening screw during subsequent machining can it work. Brief description of the drawings

[0008] Figure 1 is the main structural schematic view of the present utility model;

[0009] Figure 2 of the present utility model Figure 1 is the schematic A-A sectional view;

[0010] Figure 3 is the main structural schematic view of the cutter holder of the present utility model;

[0011] Figure 4 is the side structural schematic view of the cutter holder of the present utility model;

[0012] Figure 5 is the top structural schematic view of the cutter holder of the present utility model;

[0013] Figure 6 is the main structural schematic view of the tooling plate of the present utility model;

[0014] Figure 7 is the sectional schematic view of the tooling plate of the present utility model;

[0015] Figure 8 is the three-dimensional schematic view of the tooling plate of the present utility model.

[0016] Figure 9 is the three-dimensional schematic view of the cutter holder of the present utility model.

[0017] In the figure: 1. Tooling plate; 2. Fixed block; 3. Adjusting screw one; 4. Fastening screw one; 5. Positioning pin; 6. Cutter holder; 7. Pressure plate; 8. Fastening screw two; 9. Adjusting screw two; 10. Positioning pin hole. Detailed implementation manners

[0018] The following makes a specific description of the present utility model in conjunction with the drawings and embodiments.

[0019] As Figures 1-9As shown in the figure, the utility model provides a self-positioning eccentric hole tooling for a lathe, which includes a tooling disc 1, a fixing block 2, an adjusting screw 1 3, a fastening screw 1 4, a positioning pin 5, a cutter seat 6, a pressing plate 7, a fastening screw 2 8 and an adjusting screw 2 9. One end of the cutter seat 6 is provided with a convex edge. The cutter seat 6 is fastened to the tooling disc 1 by using the pressing plate 7 and screwing the fastening screw 2 8 tightly, and can rotate together with the tooling disc 1; there are two positioning pin holes 10 on the tooling disc 1, and the positioning pin 5 is arranged in the positioning pin holes 10. The positioning pin 5 and the positioning pin holes 10 of the tooling disc 1 are in transitional fit, and the dimensional tolerance is taken as ±0.002 mm. The positioning pin 5 can enable the eccentric workpiece to achieve automatic centering, and the positioning effect is good; a fixing block 2 is arranged above the cutter seat 6, and an adjusting screw 1 3 is arranged on the fixing block 2. The fixing block 2 is fixed on the tooling disc 1 by the fastening screw 1 4.

[0020] The tooling disc 1 is disc-shaped and is machined on a lathe. There is a central inner hole on it, and a groove matching the cutter seat 6 is milled on one end face of the inner hole. The cutter seat 6 is placed in the groove.

[0021] The positioning pin 5 and the positioning pin holes 10 of the tooling disc 1 are in transitional fit. The positioning pin 5 can enable the cutter seat 6 to automatically center by using the three-point positioning principle. The structure of the tooling disc is as Figure 6 shown. The three vertices of the triangle cbe are positioned, and the center of the through hole φ41 of the cutter seat 6 can coincide with the center c of the tooling disc 1, meeting the machining accuracy requirements for eccentric hole turning without calibration.

[0022] The diameter d of the positioning pin hole 10 can be calculated from the outer diameter and eccentricity of the workpiece. The schematic front view of the tooling disc structure is Figure 6 shown. In the triangle abc, ∠cab = 135°. The end point a is the center of gravity point of the cutter seat 6, the end point b is the center point of the positioning pin hole 10, the end point c is the center point of the tooling disc 1. The length of the line segment ac is the eccentricity (40.43) between the center point of the tooling disc 1 and the center of gravity point of the cutter seat 6. The length of the line segment ab is the sum of the distance 63.9 from the center of gravity point of the cutter seat 6 to the outer circle of the positioning pin hole 10 and d / 2. The length of the line segment bc is the sum of the distance 96.2 from the center of the tooling disc 1 to the outer circle of the positioning pin hole 10 and d / 2. According to the cosine theorem (bc)2 = (ab)2 + (ac)2 - 2(ab)×(ac)cos∠cab, where ab = 63.9 + d / 2 and bc = 96.2 + d / 2 in the formula, the diameter d of the positioning pin hole 10 can be calculated; the length of the line segment ce is the sum of the distance 40.8 from the center point of the tooling disc 1 to the outer circle of the positioning pin hole 10 and d / 2, and the point e is the position of the center point of the other positioning pin hole 10.

[0023] During operation, the tooling plate 1 is clamped by a three-jaw self-centering chuck, and the runout of the outer circle and end face of the tooling plate 1 is corrected, with the value being less than 0.005 mm. Install the cutting tool holder 6, and gently rotate the adjusting screw 1 until it touches the surface of the cutting tool holder 6. Insert the two selected positioning pins 5 into the positioning pin holes 10 of the tooling plate 1 and make contact with the machined arc surface and inclined surface, which can enable the eccentric workpiece to achieve automatic centering. To prevent the pins from loosening, the positioning pins 5 and the positioning pin holes 10 adopt an interference fit. Tighten the fastening screw 2, so that the pressing plate 7 fastens the cutting tool holder 6 on the tooling plate 1 and they rotate together. This part has a mixed clamping of an arc surface and a plane. At the same time, remove the two positioning pins 5. Turn the inner hole of the cutting tool holder 6 according to the turning process to meet the drawing requirements.

[0024] The effects achieved by the present utility model are as follows:

[0025] ① Traditional processing technology: 1 hour, drilling on boring machine T612 for 1 (hour) × (50) yuan / hour, that is: 1×50 = 50 (yuan)

[0026] ② The present utility model: 0.27 (hour) × 50 (yuan) = 13.5 (yuan) during lathe processing.

[0027] ③ Benefit comparison: original working hours 50 (yuan) / new working hours 13.5 (yuan) = 3.7 times,

[0028] Cost saved per piece: 50 - 13.5 = 36.5 (yuan)

[0029] ④ Each shield machine has 78 cutting tool holders, and the total cost saved: 78 (pieces) × 36.5 (yuan) = 2847 (yuan)

[0030] The eccentric error of the self-positioning turning eccentric hole tooling of the present utility model can be controlled within ±0.01 mm. For eccentric workpieces of different specifications and sizes, as long as different positioning pins are replaced, the machining accuracy requirements for turning eccentric holes can be met without calibration. During processing, the scribing process is omitted, the rapid clamping has high processing efficiency, and the processing quality is significantly improved; it has strong versatility, and for eccentric holes whose outer shapes can be placed into the tooling holes for machining, workpieces within a certain range can be turned; only one-time adjustment of the coaxiality between the fixture center and the machine tool center is required for clamping this tooling, and only the fastening screw needs to be turned during subsequent processing to work.

[0031] The above implementation examples of the present utility model are only illustrative and not exclusive. All changes within the scope of the present utility model or equivalent to the present utility model are encompassed by the present utility model.

Claims

1. A self-positioning eccentric hole tooling for a lathe, characterized in that: It includes a tooling plate (1), a fixing block (2), an adjusting screw I (3), a fastening screw I (4), a positioning pin (5), a cutter tool holder (6), a pressing plate (7), a fastening screw II (8) and an adjusting screw II (9). One end of the cutter tool holder (6) is provided with a convex edge. The cutter tool holder (6) is fastened to the tooling plate (1) by the pressing plate (7) using the tightened fastening screw II (8) and can rotate together with the tooling plate (1). Two positioning pin holes (10) are provided on the tooling plate (1), and the positioning pin (5) is arranged in the positioning pin holes (10). A fixing block (2) is provided above the cutter tool holder (6), and an adjusting screw I (3) is provided on the fixing block (2). The fixing block (2) is fixed to the tooling plate (1) by the fastening screw I (4).

2. The self-positioning eccentric hole tooling for a lathe according to claim 1, characterized in that: The tooling plate (1) is disc-shaped and is provided with a central inner hole. A groove matching the cutter tool holder (6) is milled on one end face of the inner hole, and the cutter tool holder (6) is placed in the groove.

3. The self-positioning eccentric hole tooling for a lathe according to claim 1 or 2, characterized in that: The positioning pin (5) and the positioning pin hole (10) of the tooling plate (1) are in transitional fit, and the positioning pin (5) can make the cutter tool holder (6) automatically centered.

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