A machine tool clamp

Abstract

The utility model discloses a machine tool fixture, it includes base, left tension ring, right tension ring and positioning sleeve, the lower part of base be equipped with annular step surface, the periphery of middle part isohedral distribution four screw holes, each screw hole be equipped with clamping screw in, the upper portion both sides of base be equipped with left tension ring and right tension ring, and the front end of base is provided with silk slot, the lower end of positioning sleeve be equipped with locating cylindrical surface, locating cylindrical surface set up in the hole of base upper end, and the upper end of positioning sleeve is equipped with extraction step, and positioning sleeve inside is equipped with locating hole. The utility model discloses simple structure, and clamping adjustment is convenient, and the positioning precision is high, and the machining stability is good, can expand the working range of electro -erosion machine.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical manufacturing process equipment technology, specifically relating to a fixture for a CNC wire electrical discharge machining (EDM) machine tool. Background Technology

[0002] In the machinery manufacturing industry, CNC wire electrical discharge machining (EDM) machines are the most widely used special processing equipment, especially fast-wire and medium-wire EDM machines. Compared to tool cutting, wire EDM offers significant advantages such as less machining deformation, higher machining accuracy, higher surface finish, and higher precision, making it particularly suitable for processing materials with high strength, high hardness, high toughness, and high brittleness. Gear shafts are crucial components in mechanical transmission. Due to the unique characteristics of wire feeding and feeding in wire EDM machines, it is almost impossible to cut gear shaft teeth using EDM. To address this, a Chinese patent (patent number CN201920273721.8) disclosed a small wire EDM machine fixture for holding shaft-like parts. While this fixture demonstrates significant advancements in wire feeding and feeding, it suffers from several technical drawbacks during clamping, including excessive deformation of the disc-shaped fixture body under stress on the clamping screws, severe misalignment between the gear shaft and the disc-shaped fixture body, and complex three-screw adjustment operations. After reviewing relevant literature, no process equipment for wire EDM machining of gear shafts has been found. Summary of the Invention

[0003] The purpose of this utility model is to provide a simple structure, convenient operation, and high clamping accuracy to meet the clamping needs of wire EDM machines for cutting shaft parts such as gear shafts, thereby expanding the working range of wire EDM machines. At the same time, it effectively solves the various drawbacks and defects of existing clamping technologies in the background art when clamping shaft parts.

[0004] To achieve the above objectives, this utility model provides a machine tool fixture, comprising a base, a left tensioning ring, a right tensioning ring, and a positioning sleeve. The lower part of the base has an annular stepped surface, and four screw holes are evenly distributed around the center, with a clamping screw in each screw hole. The upper part of the base has a left tensioning ring and a right tensioning ring on both sides, and a thread inlet groove is provided at the front end of the base. The lower end of the positioning sleeve has a positioning cylindrical surface, which is set in a hole at the upper end of the base. The upper end of the positioning sleeve has a pull-out step, and the positioning sleeve has a positioning hole inside.

[0005] In the above technical solution, a U-shaped groove is provided on each side of the annular step surface, a pivot 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 and right tensioning rings are fixed to the base by pivot pins and pads.

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

[0008] The front end of the right tensioning ring is provided with a U-shaped buckle, the tensioning screw hole and the U-shaped buckle are provided with a tensioning screw, and the tensioning screw is provided with a tensioning nut.

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

[0010] Preferably, the width of the wire feed groove is 0.2 to 1.0 mm.

[0011] Preferably, a locking nut is provided on the outside of the clamping screw that connects to the base.

[0012] Preferably, a pivot pin is provided inside the pivot hole, and the pivot pin is tightly fitted with the pivot hole.

[0013] Preferably, the center of the wire feed groove is perpendicular to the reference plane and passes through the axis of the base, and the reference plane is parallel to the center line of the two U-shaped grooves.

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

[0015] Preferably, when the left and right tensioning rings are closed, their inner diameters are equal to the outer diameter of the upper end of the base.

[0016] Using the above scheme, after the left and right tensioning rings at the top of the base are closed, they fit against the outer diameter of the upper end of the base, and the tensioning nut is locked, resulting in minimal deformation of the base. Practical testing shows that the four screws clamp the base, making adjustment convenient and providing good clamping stability. The positioning sleeve is positioned by cooperating with the gear shaft end through the inner hole, achieving high positioning accuracy and easy removal.

[0017] Compared with the prior art, the advantages of this utility model are that it has a simple structure, convenient clamping and adjustment, high positioning accuracy, good clamping stability, and convenient wire feeding and unloading. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a machine tool fixture;

[0019] Figure 2 yes Figure 1 Top view;

[0020] Figure 3 yes Figure 1 The left view;

[0021] Figure 4 yes Figure 1 Schematic diagram of the middle positioning sleeve;

[0022] Figure 5 yes Figure 1 Schematic diagram of the left and middle tensioning ring;

[0023] Figure 6 yes Figure 5 C-direction view;

[0024] Figure 7 yes Figure 1 Schematic diagram of the right tensioning ring;

[0025] Figure 8 yes Figure 7 The left view;

[0026] Figure 9 This is a simplified diagram of the gear shaft blank.

[0027] The labels in the attached diagram are as follows: 1. Base, 11. Annular stepped surface, 12. U-shaped groove, 13. Thread feed groove, 14. Reference surface, 15. Screw hole, 16. Rotary pin hole, 2. Left tension ring, 21. Tensioning screw hole, 2'. Right tension ring, 21'. U-shaped buckle, 3. Clamping screw, 31. Locking nut, 4. Positioning sleeve, 41. Positioning cylindrical surface, 42. Pull-out step, 43. Positioning hole, 5. Rotary pin, 6. Pad, 7. Tensioning screw, 71. Tensioning nut, 8. Gear shaft blank, 81. Shaft end, 82. Gear blank. Detailed Implementation

[0028] 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.

[0029] Depend on Figure 1 , Figure 2 , Figure 3 and Figure 4 As can be seen, a machine tool fixture includes a base 1, a left tensioning ring 2, a right tensioning ring 2', and a positioning sleeve 4. The lower part of the base 1 is provided with an annular stepped surface 11, and four screw holes 15 are distributed at equal angles around the center. Each screw hole 15 is provided with a clamping screw 3. The upper two sides of the base 1 are provided with a left tensioning ring 2 and a right tensioning ring 2', and the front end of the base 1 is provided with a thread feed groove 13. The lower end of the positioning sleeve 4 is provided with a positioning cylindrical surface 41, which is set in a hole at the upper end of the base 1. The upper end of the positioning sleeve 4 is provided with a pull-out step 42, and the positioning sleeve 4 is provided with a positioning hole 43 inside. The annular stepped surface 11 is provided with a U-shaped groove 12 on each side, and the rear end of the annular stepped surface 11 is provided with a pivot hole 16.

[0030] Depend on Figure 5 and Figure 7As can be seen, the front end of the left tensioning ring 2 is provided with a tensioning screw hole 21, and the front end of the right tensioning ring 2' is provided with a U-shaped buckle 21'. Figure 2 As can be seen, a tensioning screw 7 is provided in the tensioning screw hole 21 and the U-shaped buckle 21', and a tensioning nut 71 is provided on the tensioning screw 7.

[0031] The operation method and process of this utility model are as follows: First, insert the screw into the U-shaped groove 12 and place the utility model on the machine tool worktable. Shake the X-axis handwheel of the machine tool and use a dial indicator to check whether the reference surface 14 is parallel to the X-axis direction of the machine tool. The base 1 can be slightly rotated 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 machine tool handwheel 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' close. The inner surfaces of ring 2 and right tension ring 2' are in contact with the upper surface of base 1; Step 4: Insert the gear shaft blank 8 into base 1 and rotate the four clamping screws 3 so that the front end of the clamping screws 3 contacts the gear blank 82; Step 5: Place the positioning sleeve 4 on base 1 and make the positioning cylindrical surface 41 fit with the inner hole of base 1, and the positioning hole 43 fit with the shaft end 82; Step 6: Tighten the four clamping screws 3 in sequence, and rotate the positioning sleeve 4 to rotate relative to base 1. After the gear shaft blank 8 is firmly fixed, the positioning sleeve 4 can be removed upwards.

[0032] In this embodiment, the reference surface 14 is perpendicular to the wire feed groove 13 to ensure that the machine tool does not interfere with the base 1 when feeding wire in the Y-axis direction.

[0033] In this embodiment, to ensure minimal deformation of the base 1 and convenient wire feeding and retraction, the width of the wire feeding groove 13 is 0.2 to 1.0 mm.

[0034] In this embodiment, the left tensioning ring 2 and the right tensioning ring 2' can be opened or closed around the pivot pin 5. The diameter of the hole after the left tensioning ring 2 and the right tensioning ring 2' are closed is equal to the outer diameter of the upper end of the base 1. The base 1 does not deform when the four clamping screws 3 are clamped on the gear shaft blank 8 by the tightening screws 7 and the tightening nut 71, thereby ensuring the clamping accuracy of the gear shaft blank 8.

[0035] In this embodiment, to ensure the stability of clamping during the cutting process, a locking nut 31 is provided on the outside of the clamping screw 3 connected to the base 1.

[0036] In this embodiment, the lower end of the positioning sleeve 4 is provided with a positioning cylindrical surface 41 with a fitting clearance of 0.01 to 0.05 mm between it and the inner hole of the base 1, and the positioning hole 43 with a fitting clearance of 0.01 to 0.03 mm between it and the shaft end of the gear shaft blank 8, thereby ensuring both clamping accuracy and easy removal of the positioning sleeve 4.

[0037] In this embodiment, for gear shaft parts with different shaft diameters, multiple parts can be positioned simply by replacing the positioning sleeve 4 with one that corresponds to the shaft diameter.

[0038] This invention can not only clamp gear shafts, but also be used for clamping other shaft parts such as cutting sprocket shafts.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which 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) has an annular stepped surface (11) at the bottom and four screw holes (15) distributed at equal angles around the center. Each screw hole (15) is provided with a clamping screw (3). The upper sides of the base (1) are provided with a left tensioning ring (2) and a right tensioning ring (2'). The front end of the base (1) is provided with a thread inlet groove (13). The lower end of the positioning sleeve (4) is provided with a positioning cylindrical surface (41). The positioning cylindrical surface (41) is set in the hole at the upper end of the base (1). The upper end of the positioning sleeve (4) is provided with a pull-out step (42). The positioning sleeve (4) is provided with a positioning hole (43) inside.

2. The machine tool fixture according to claim 1, characterized in that: The annular step surface (11) is provided with a U-shaped groove (12) on each side, a pivot hole (16) at the rear end of the annular step surface (11), and a reference surface (14) 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) by a pivot pin (5) and a pad (6).

4. A machine tool fixture according to claim 1, characterized in that: The left tensioning ring (2) has a tensioning screw hole (21) at its front end.

5. A machine tool fixture according to claim 4, characterized in that: The front end of the right tensioning ring (2') is provided with a U-shaped buckle (21'), and a tensioning screw (7) is provided in the tensioning screw hole (21) and the U-shaped buckle (21'). A tensioning nut (71) is provided on the tensioning screw (7).

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

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

8. A machine tool fixture according to claim 1, characterized in that: The clamping screw (3) is connected to the base (1) with a locking nut (31) on the outside.

9. A machine tool fixture according to claim 2, characterized in that: The pivot hole (16) is provided with a pivot pin (5), and the pivot pin (5) is tightly fitted with the pivot hole (16).

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

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