Machine tool clamp

Abstract

The machine tool clamp comprises a base, a left tensioning ring, a right tensioning ring and a positioning sleeve, an annular step face is arranged on the lower portion of the base, four screw holes are distributed in the periphery of the middle of the base in an equiangular mode, and a clamping screw is arranged in each screw hole; a left tensioning ring and a right tensioning ring are arranged on the two sides of the upper portion of the base, and a wire feeding groove is formed in the front end of the base. A positioning cylindrical surface is arranged at the lower end of the positioning sleeve, the positioning cylindrical surface is arranged in a hole in the upper end of the base, an extraction step is arranged at the upper end of the positioning sleeve, and a positioning hole is formed in the positioning sleeve. The clamping device is simple in structure, convenient to clamp and adjust, high in positioning precision, good in machining stability and capable of expanding the working range of electric machining equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing process equipment, and in particular relates to a clamp of a numerically controlled electric spark wire cutting machine tool. Background Art

[0002] In the machinery manufacturing industry, CNC wire EDM is the most widely used special processing equipment, especially fast wire cutting and medium wire cutting machines. Compared with tool cutting, wire EDM has significant advantages such as small processing deformation, high processing accuracy, high finish and high precision. It is particularly suitable for processing "four high" materials with high strength, high hardness, high toughness and high brittleness. Gear shaft is an important component of mechanical transmission. Due to the particularity of wire cutting and wire cutting, it is almost impossible to use wire cutting to cut gear shaft teeth. In order to change this situation, China Patent has published a small wire cutting machine fixture for clamping shaft parts, with the patent number CN201920273721.8. The fixture has strong advancement in the process of wire feeding and wire cutting, but there are technical defects such as large external deformation of the disc clamp after the clamping screw is stressed during the clamping process, serious coaxiality error between the gear shaft and the disc clamp, and complicated operation of adjusting the position of the three screws. After consulting relevant literature, no process equipment for wire cutting machine tools to process gear shafts has been found. Summary of the invention

[0003] The purpose of the present invention is to provide a device with a simple structure, convenient operation and high clamping precision, which can meet the clamping needs of wire cutting machine tools for cutting shaft parts such as gear shafts, so as to expand the working range of the wire cutting machine tools, and at the same time effectively solve the various drawbacks and usage defects of the existing clamping technology in the background technology when clamping shaft parts.

[0004] To achieve the above-mentioned purpose, the present invention provides a machine tool fixture, which includes a base, a left tightening ring, a right tightening ring and a positioning sleeve, the lower part of the base is provided with an annular step surface, four screw holes are equiangularly distributed around the middle part, and a clamping screw is provided in each screw hole; the upper sides of the base are provided with a left tightening ring and a right tightening ring, and the front end of the base is provided with a wire feeding groove; the lower end of the positioning sleeve is provided with a positioning cylindrical surface, and the positioning cylindrical surface is arranged in the hole at the upper end of the base, the upper end of the positioning sleeve is provided with an extraction step, and a positioning hole is provided inside the positioning sleeve.

[0005] In the above technical solution, U-shaped grooves are respectively provided on both sides of the annular step surface, a turn pin hole is provided at the rear end of the annular step surface, and a reference surface is provided at the front end of the annular step surface.

[0006] The rear ends of the left tension ring and the right tension ring are fixed on the base through a rotating pin and a cushion block.

[0007] The front end of the left tightening ring is provided with a tightening screw hole.

[0008] A U-shaped buckle is arranged at the front end of the right tightening ring, a tightening screw is arranged in the tightening screw hole and the U-shaped buckle, and a tightening nut is arranged on the tightening screw.

[0009] The left tensioning ring and the right tensioning ring can be opened or closed around the rotating pin.

[0010] Preferably, the wire feeding slot has a width of 0.2 to 1.0 mm.

[0011] Preferably, a locking nut is provided on the outside where the clamping screw is connected to the base.

[0012] Preferably, a rotation pin is provided in the rotation pin hole, and the rotation pin is tightly matched with the rotation pin hole.

[0013] Preferably, the center of the wire feeding slot is perpendicular to the reference plane and passes through the axis of the base, and the reference plane is parallel to the center lines of the two U-shaped slots.

[0014] Preferably, the center of the wire feeding slot is perpendicular to the reference plane and passes through the axis of the base.

[0015] Preferably, when the left tension ring and the right tension ring are closed, the inner diameter is equal to the outer diameter of the upper end of the base.

[0016] By adopting the above scheme, after the left tightening ring and the right tightening ring on the upper part of the base are closed, they fit with the outer diameter of the upper end of the base, and the tightening nut is locked, and the deformation of the base is minimal; practical tests show that the four screws are clamped, which is easy to adjust and has good clamping stability. The inner hole of the positioning sleeve is used to cooperate with the shaft end of the gear shaft for positioning, with high positioning accuracy and easy removal.

[0017] Compared with the prior art, the beneficial effects of the present invention are simple structure, convenient clamping and adjustment, high positioning accuracy, good clamping stability, and convenient wire advancement and retraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a machine tool fixture; Figure 2 yes Figure 1 A top view of Figure 3 yes Figure 1 Left view of Figure 4 yes Figure 1 A schematic diagram of the structure of the middle positioning sleeve; Figure 5 yes Figure 1 The structural diagram of the tension ring on the middle left; Figure 6 yes Figure 5 Middle C-direction view; Figure 7 yes Figure 5 yes Figure 1 The structural diagram of the middle right tension ring; Figure 8 yes Figure 7 Left view of Fig. 9 This is a schematic diagram of the gear shaft blank.

[0019] The symbols in the accompanying drawings are: 1. base, 11. annular step surface, 12. U-shaped groove, 13. wire feeding groove, 14. reference surface, 15. screw hole, 16. turn pin hole, 2. left tightening ring, 21. tightening screw hole, 2', right tightening ring, 21', U-shaped buckle, 3. clamping screw, 31. locking nut, 4. positioning sleeve, 41. positioning cylindrical surface, 42. extraction step, 43. positioning hole, 5. turn pin, 6. spacer, 7. tightening screw, 71. tightening nut, 8. gear shaft blank, 81. shaft end, 82. gear blank. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Depend on Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that a machine tool fixture includes a base 1, a left tightening ring 2, a right tightening ring 2' and a positioning sleeve 4, wherein the lower part of the base 1 is provided with an annular step surface 11, and four screw holes 15 are equiangularly distributed around the middle part, and each screw hole 15 is provided with a clamping screw 3; the upper two sides of the base 1 are provided with a left tightening ring 2 and a right tightening ring 2', and the front end of the base 1 is provided with a wire feeding groove 13; the lower end of the positioning sleeve 4 is provided with a positioning cylindrical surface 41, and the positioning cylindrical surface 41 is arranged in the hole at the upper end of the base 1, the upper end of the positioning sleeve 4 is provided with an extraction step 42, and the inside of the positioning sleeve 4 is provided with a positioning hole 43; the two sides of the annular step surface 11 are respectively provided with U-shaped grooves 12, and the rear end of the annular step surface 11 is provided with a turn pin hole 16.

[0022] Depend on Figure 5 and Figure 7 It can be seen that the front end of the left tension ring 2 is provided with a tension screw hole 21, and the front end of the right tension ring 2' is provided with a U-shaped buckle 21'. Figure 2 It can be seen that a tightening screw 7 is disposed in the tightening screw hole 21 and the U-shaped buckle 21 ′, and a tightening nut 71 is disposed on the tightening screw 7 .

[0023] The operation method and process of the present invention are as follows: first, insert a screw into the U-shaped groove 12 and place the present invention on the machine tool workbench, shake the X-axis hand wheel of the machine tool, use a dial indicator to detect whether the reference surface 14 is parallel to the X-axis direction of the machine tool, and slightly rotate the base 1 to make the reference surface 14 parallel to the X-axis of the machine tool; second, tighten the screw to fix the base 1 on the machine tool, shake the hand wheel of the machine tool to make the electrode wire enter the hole of the base 1; third, close the left tension ring 2 and the right tension ring 2', and lock the tension nut 71 to make the left tension ring 2 And the inner surface of the right tightening ring 2' is in contact with the upper end surface of the base 1; the fourth step: install the gear shaft blank 8 into the base 1, and rotate the four clamping screws 3 so that the front end of the clamping screws 3 contacts the gear blank 82; the fifth step: place the positioning sleeve 4 on the base 1, and make the positioning cylindrical surface 41 fit with the inner hole of the base 1, and the positioning hole 43 fit with the shaft end 82; the sixth step: tighten the four clamping screws 3 in sequence, and rotate the positioning sleeve 4 to rotate relative to the base 1. After the gear shaft blank 8 is firmly fixed, the positioning sleeve 4 can be removed upwards.

[0024] In this embodiment, the reference surface 14 is perpendicular to the wire feeding groove 13 to ensure that the wire does not interfere with the base 1 when the machine tool feeds the wire in the Y-axis direction.

[0025] In this embodiment, in order to ensure that the deformation of the base 1 is minimal and the wire feeding and retracting is convenient, the width of the wire feeding groove 13 is 0.2-1.0 mm.

[0026] In this embodiment, the left tensioning ring 2 and the right tensioning ring 2' can be opened or closed around the rotating pin 5. The aperture of the left tensioning ring 2 and the right tensioning ring 2' after closing is equal to the outer diameter of the upper end of the base 1. By locking the tensioning screws 7 and the tensioning nut 71, the four clamping screws 3 are used to clamp the gear shaft blank 8, and the base 1 is not deformed, thereby ensuring the clamping accuracy of the gear shaft blank 8.

[0027] In this embodiment, in order to ensure the clamping stability during the cutting process, a locking nut 31 is provided outside the connection between the clamping screw 3 and the base 1 .

[0028] In this embodiment, the lower end of the positioning sleeve 4 is provided with a positioning cylindrical surface 41, and the fitting clearance between the positioning sleeve 4 and the inner hole of the base 1 is 0.01 to 0.05 mm, and the fitting clearance between the positioning hole 43 and the shaft end of the gear shaft blank 8 is 0.01 to 0.03 mm, thereby ensuring the clamping accuracy and facilitating the removal of the positioning sleeve 4.

[0029] In this embodiment, for gear shaft parts with different shaft diameters, it is only necessary to replace the positioning sleeve 4 corresponding to the shaft diameter size to achieve multi-part positioning.

[0030] The invention can not only clamp the gear shaft, but also be used for clamping other shaft parts such as cutting sprocket shafts.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A machine tool fixture, comprising a base (1), a left tensioning ring (2), a right tensioning ring (2') and a positioning sleeve (4), characterized in that: The base (1) is provided with an annular step surface (11) at the lower part, and four screw holes (15) are equiangularly distributed around the middle part, and each screw hole (15) is provided with a clamping screw (3); the upper two sides of the base (1) are provided with a left tightening ring (2) and a right tightening ring (2'), and the front end of the base (1) is provided with a wire feeding groove (13); the lower end of the positioning sleeve (4) is provided with a positioning cylindrical surface (41), and the positioning cylindrical surface (41) is arranged in the hole at the upper end of the base (1); the upper end of the positioning sleeve (4) is provided with an extraction step (42), and the positioning sleeve (4) is provided with a positioning hole (43) inside.

2. A machine tool fixture according to claim 1, characterized in that: A U-shaped groove (12) is provided on both sides of the annular step surface (11), a turn pin hole (16) is provided at the rear end of the annular step surface (11), and a reference surface (14) is provided at the front end of the annular step surface (11).

3. A machine tool fixture according to claim 1, characterized in that: The rear ends of the left tension ring (2) and the right tension ring (2') are fixed to the base (1) via a rotating pin (5) and a cushion block (6).

4. A machine tool fixture according to claim 1, characterized in that: A tightening screw hole (21) is provided at the front end of the left tightening ring (2).

5. The machine tool fixture according to claim 1, characterized in that: A U-shaped buckle (21') is provided at the front end of the right tightening ring (2'), a tightening screw (7) is provided in the tightening screw hole (21) and the U-shaped buckle (21'), and a tightening nut (71) is provided on the tightening screw (7).

6. A machine tool fixture according to claim 1, characterized in that: The left tension ring (2) and the right tension ring (2') can be opened or closed around the rotating pin (5).

7. A machine tool fixture according to claim 1, characterized in that: The width of the wire feeding groove (13) is 0.2 to 1.0 mm, and the center of the wire feeding groove (13) is perpendicular to the reference surface (14) and passes through the axis of the base (1).

8. The machine tool fixture according to claim 1, characterized in that: A locking nut (31) is provided on the outside of the connection between the clamping screw (3) and the base (1).

9. A machine tool fixture according to claim 2, characterized in that: A rotation pin (5) is arranged in the rotation pin hole (16), and the rotation pin (5) is tightly matched with the rotation pin hole (16).

10. The machine tool fixture according to claim 6, characterized in that: When the left tension ring (2) and the right tension ring (2') are closed, the inner diameters thereof are equal to the outer diameters of the upper ends of the base (1).

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