Cutting jig

Abstract

The utility model relates to a kind of cutting clamps, including chuck, the cushion block being set in chuck center position, the cushion block is equipped with several positioning shafts;Chuck is also equipped with the presser jaw of pressing on cushion block, relative movement between presser jaw and chuck, with two kinds of state of pressing, releasing part, part is simultaneously subjected to circumferential and radial location on cushion block.The utility model is different from the clamping mode that the conventional three-jaw chuck only provides circumferential clamping location, adopts the structure of cushion block, positioning shaft, presser jaw combination, limit force is applied to part from circumferential, axial, accurately positioned processing.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a cutting fixture. Background Technology

[0002] For machining ring-shaped sheet parts, circumferential restraint is usually required. A chuck-type fixture, such as a three-jaw chuck, is commonly used on cutting machines. The chuck-type fixture applies a clamping and restraining force to the part circumferentially. However, if the part is thin, applying a circumferential restraining force can lead to several issues: firstly, the small force-bearing area may cause deformation of the clamping position; secondly, excessive clamping force can cause uneven local force distribution on the part, resulting in misalignment or non-axisymmetry with the rotating shaft, affecting subsequent material removal processes. Utility Model Content

[0003] In response to the shortcomings of the existing production technology, the applicant provides a cutting fixture with a reasonable structure that has the advantage of applying limiting forces to the part simultaneously from the circumferential and axial directions.

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

[0005] A cutting fixture includes a chuck and a pad block disposed at the center of the chuck, the pad block having a plurality of positioning shafts; the chuck also has pressing jaws that press against the pad block, the pressing jaws moving relative to the chuck, and having two states: pressing and releasing parts.

[0006] The part is simultaneously constrained circumferentially and radially on the pad.

[0007] As a further improvement to the above technical solution:

[0008] The pad is fastened to the chuck, and the positioning shaft is set on the surface of the pad and is shaped like a frustum.

[0009] The pad is also provided with a support shaft, the axial length of which is less than the axial length of the positioning shaft.

[0010] The difference in axial length between the support shaft and the positioning shaft is greater than or equal to the thickness of the part to be processed.

[0011] The pad block facing the pressing jaw is set as a plane perpendicular to the chuck, and the base of the pressing jaw abuts against this plane.

[0012] The pressing gripper includes a base disposed on the chuck and a gripper body disposed on the base, the gripper body being bent and extended to the pad.

[0013] The combined structure of the claw body and the base moves relative to the chuck; a piston rod is provided on the side of the base away from the claw body, and the piston rod drives the base to make axial reciprocating motion.

[0014] The claw moves relative to the base.

[0015] One end of the claw is hinged to the base, and the claw is also provided with a pin connection between the claw and the base.

[0016] The claw body and the base are connected by a detachable fastening structure.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model differs from conventional three-jaw chucks that only provide circumferential clamping and limiting. It adopts a structure that combines pads, positioning shafts, and pressing jaws to apply limiting forces to the parts from both the circumferential and axial directions, ensuring that the parts are always coaxial with the rotating shaft, which facilitates precise positioning and machining of the cutting tool.

[0019] The pressing claws of this utility model have a symmetrical structure, which ensures that the force pressed on the parts is consistent and that the force is equal at all points when the parts are limited. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this application.

[0021] Figure 2 The orientation of this application during actual use is such that the axis is on a horizontal plane.

[0022] Figure 3 This is a schematic diagram of the hidden claw body of the clamp in this application.

[0023] Figure 4 This is a schematic diagram of a single set of pressing claws in this application. The figure shows the structure of Embodiment 1.

[0024] Figure 5 This is a schematic diagram of the pressing gripper structure in Embodiment 2 of this application.

[0025] Figure 6 This is a schematic diagram of the pressing gripper from another perspective in Embodiment 2 of this application.

[0026] The components include: 1. Chuck; 2. Pad; 3. Pressing jaws;

[0027] 201. Positioning shaft; 202. Support shaft;

[0028] 301. Base; 302. Claw body; 303. Piston rod; 304. Pin joint; 305. Pin joint connecting piece; 306. Hinge piece. Detailed Implementation

[0029] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0030] like Figures 1-6As shown, the cutting fixture of this embodiment includes a chuck 1 and a pad 2 disposed at the center of the chuck 1. The pad 2 is provided with a plurality of positioning shafts 201. The chuck 1 is also provided with pressing jaws 3 that press against the pad 2. The pressing jaws 3 move relative to the chuck 1 and have two states: pressing and releasing the parts.

[0031] The part is simultaneously restricted in both the circumferential and radial directions on the pad 2.

[0032] The pad 2 is fastened to the chuck 1, and the positioning shaft 201 is set on the surface of the pad 2, and the positioning shaft 201 is set in the shape of a frustum.

[0033] The pad 2 is also provided with a support shaft 202, the axial length of which is less than the axial length of the positioning shaft 201.

[0034] The difference in axial length between the support shaft 202 and the positioning shaft 201 is greater than or equal to the thickness of the part to be processed.

[0035] The pad 2 is set to a plane perpendicular to the chuck 1 on the side facing the pressing claw 3, and the base 301 of the pressing claw 3 abuts against this plane.

[0036] The pressing gripper 3 includes a base 301 disposed on the chuck 1 and a gripper body 302 disposed on the base 301, the gripper body 302 being bent and extended to the pad block 2.

[0037] The combined structure of the claw body 302 and the base 301 moves relative to the chuck 1; a piston rod 303 is provided on the side of the base 301 away from the claw body 302, and the piston rod 303 drives the base 301 to perform axial reciprocating motion.

[0038] The claw 302 moves relative to the base 301.

[0039] One end of the claw body 302 is hinged to the base 301, and the claw body 302 is also provided with a pin connection position 304 between the claw body 302 and the base 301.

[0040] The claw body 302 and the base 301 are connected by a detachable fastening structure.

[0041] The specific structure and limiting principle of this application are as follows:

[0042] Example 1:

[0043] like Figure 1 The figure shown is a perspective view of the fixture structure of this application, including a chuck 1, a pad 2 located at the center of the chuck 1, and the part placed on the pad 2. Due to the actual machining process, the fixture is positioned as follows... Figure 2 Since the axis is on a horizontal plane, the parts need to be constrained in at least three directions to ensure that the relative position of the sheet-like parts is stable when placed vertically.

[0044] like Figure 1 and Figure 2 As shown, a positioning shaft 201 and a support shaft 202 are arranged in a circumferential array on the pad 2, with the positioning shaft 201 and support shaft 202 staggered. When a part is placed on the pad 2, its back is supported by the support shaft 202, separating the part from the surface of the pad 2, thus preventing the cutting tool from directly colliding with the pad 2 during subsequent cutting. The positioning shaft 201 passes through a through hole in the part; in this embodiment, a frustum-shaped positioning shaft 201 is used for easy alignment with the through hole in the part. At this time, the part is... Figure 2 The vertical and horizontal directions are limited.

[0045] A pressing jaw 3 is provided on the chuck 1. In this embodiment, two sets of symmetrical pressing jaws 3 are used, with the jaw body 302 pressing against the surface of the part for positioning. Figure 2 In terms of orientation, the left and right sides of the part can move freely, which restricts the axial movement of the part.

[0046] Reference Figure 4 This is the press-type limiting structure in this embodiment. Figure 4 In this design, the claw body 302 and the base 301 are an integrated pre-installed module structure, with a piston rod 303 connected to the bottom of the base 301. Since the cutting fixture provided in this application is used on a machining center or lathe, the piston rod 303 can be connected to a cylinder on the lathe. The specific power source can utilize existing technology, which will not be elaborated in this embodiment; it is sufficient that a power source is available to drive the piston rod 303 in reciprocating motion.

[0047] During use, the part is first placed on the pad 2. At this time, the pressing jaw 3 is in its initial state, and the gap between the jaw body 302 and the pad 2 is large, providing ample space for the part to be loaded. After the part is placed on the pad 2, the jaw body 302 retracts axially until it presses against the surface of the part, at which point all six degrees of freedom of the part are restricted.

[0048] Example 2:

[0049] like Figure 3 , Figure 5 , Figure 6 As shown, there is a rotatable structure between the base 301 and the claw 302. Figure 5 and Figure 6As shown, a hinge piece 306 is formed on the base 301, and one end of the claw body 302 is hinged to the hinge piece 306, allowing for rotatable connection between the claw body 302 and the hinge piece 306. A pin-connecting piece 305 is also provided on the base 301, and a corresponding pin-connecting position 304 is provided on the claw body 302. When the claw body 302 and the pin-connecting piece 305 are not fastened, the claw body 302 can rotate around the hinge point, providing ample loading space for loading parts. Then, the claw body 302 is rotated until it presses against the part, and the claw body 302 and the pin-connecting piece 305 are then pinned together. At this point, the claw body 302 is fixed at two points, achieving reliable positioning of the part.

[0050] Example 3:

[0051] As the simplest structural method, only the claw body 302 can be used. After pressing the claw body 302 onto the part, fasteners such as bolts are screwed through the claw body 302 and into the chuck 1 to achieve a tight press-fit. This method is the simplest, but it may also have the greatest potential for accuracy differences, and therefore it is the most basic setting. Embodiment 2 of this application is the optimal choice after considering cost and accuracy.

[0052] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A cutting fixture, characterized in that: The chuck includes a chuck (1) and a pad (2) located at the center of the chuck (1). The pad (2) is provided with several positioning shafts (201). The chuck (1) is also provided with a pressing jaw (3) that presses against the pad (2). The pressing jaw (3) moves relative to the chuck (1) and has two states: pressing and releasing the parts. The part is simultaneously restricted in both the circumferential and radial directions on the pad (2).

2. The cutting fixture as described in claim 1, characterized in that: The pad (2) is fastened on the chuck (1), and the positioning shaft (201) is set on the surface of the pad (2), and the positioning shaft (201) is set in the shape of a frustum.

3. The cutting fixture as described in claim 1, characterized in that: The pad (2) is also provided with a support shaft (202), the axial length of which is less than the axial length of the positioning shaft (201).

4. The cutting fixture as described in claim 3, characterized in that: The difference in axial length between the support shaft (202) and the positioning shaft (201) is greater than or equal to the thickness of the part to be processed.

5. The cutting fixture as described in claim 1, characterized in that: The pad (2) is set to a plane perpendicular to the chuck (1) on the side facing the pressing jaw (3), and the base (301) of the pressing jaw (3) abuts against this plane.

6. The cutting fixture as described in claim 1, characterized in that: The pressing gripper (3) includes a base (301) disposed on the chuck (1) and a gripper body (302) disposed on the base (301), the gripper body (302) being bent and extended to the pad (2).

7. The cutting fixture as described in claim 6, characterized in that: The combined structure of the claw body (302) and the base (301) moves relative to the chuck (1); a piston rod (303) is provided on the side of the base (301) away from the claw body (302), and the piston rod (303) drives the base (301) to make axial reciprocating motion.

8. The cutting fixture as described in claim 6, characterized in that: The claw (302) moves relative to the base (301).

9. The cutting fixture as described in claim 8, characterized in that: One end of the claw body (302) is hinged to the base (301), and the claw body (302) is also provided with a pin connection (304) between the claw body (302) and the base (301).

10. The cutting fixture as described in claim 6, characterized in that: The claw body (302) and the base (301) are connected by a detachable fastening structure.

Images