Positioning fixture for numerical control lathe

Abstract

The utility model relates to the technical field of machine tool clamps, in particular to a positioning clamp for a numerical control lathe, which comprises a chuck and clamping jaws distributed on the chuck, the clamping jaws are step-shaped, and the high points of the clamping jaws are close to the axis of the chuck. A sliding groove is formed in the inner end of the clamping jaw, the high point end of the clamping jaw is the inner end, a buffer piece is arranged at the inner end of the clamping jaw in a sliding mode, a clamping block is arranged on the inner surface of the buffer piece, an elastic element is arranged between the clamping block and the buffer piece, and a bayonet is formed in the inner end of the clamping jaw. When descending of the clamping block along with the buffer piece is completed, the clamping block is located at the position of the bayonet, the spring pushes the limiting piece to enable the clamping block to stretch into the bayonet, at the moment, the installation process of the buffer piece is completed, and through clamping connection of the clamping block and the bayonet, the buffer piece cannot move in the direction parallel to the axis of the chuck.

Description

Technical Field

[0001] This utility model relates to the field of machine tool fixture technology, specifically to a positioning fixture for CNC lathes. Background Technology

[0002] A lathe is a machine tool that uses the relative motion between a rotating workpiece and a cutting tool to complete machining. The main function of a lathe is to turn workpieces, and it can perform machining operations such as turning outer diameters, turning inner diameters, threading, chamfering, and drilling. During the machining process on a lathe, the workpiece is often fixed by a chuck.

[0003] Chinese patent CN202420805931.8 discloses a positioning fixture for a CNC lathe, including a chuck fixture body. At least two slides are mounted on the upper end of the chuck fixture body, and grippers are connected to the top of the slides. The grippers have a stepped structure, with a first insertion hole at the center of the bottom end of each gripper and second insertion holes at both ends of the bottom of each gripper. A connecting post matching the first insertion hole is provided at the center of the top of the slide. This design incorporates a detachable buffer assembly on the gripping surface of the grippers, which not only facilitates gripping soft workpieces but also allows for periodic replacement, ensuring the stability of the chuck fixture.

[0004] Although the aforementioned patent can effectively prevent the chuck from damaging the workpiece through the buffer component, the specific connection method between the buffer component and the chuck is that a groove is opened on one clamping end of the chuck, and the buffer component is slidably connected in the groove. Since the lathe will vibrate during operation, its buffer component may be displaced in the direction parallel to the chuck axis, causing the workpiece to be displaced or the buffer component to fail to act on the workpiece. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a positioning fixture for CNC lathes to solve the technical problem mentioned in the background art that the lathe vibrates during operation, and its buffer component may be displaced in a direction parallel to the chuck axis, causing workpiece displacement or the buffer component failing to act on the workpiece.

[0006] To achieve the above objectives, this utility model provides a positioning fixture for a CNC lathe, including a chuck and jaws distributed on the chuck, wherein the jaws are stepped and the highest point is close to the axis of the chuck.

[0007] The high point of the gripper is the inner end, and a buffer plate is slidably provided on the inner end of the gripper. A locking block is provided on the inner surface of the buffer plate, and an elastic element is provided between the locking block and the buffer plate. A locking slot is opened on the inner end of the gripper.

[0008] Preferably, the buffer sheet includes a substrate and a rubber pad disposed on the outer surface of the substrate, and the surface of the rubber pad is formed with anti-slip ripples.

[0009] Preferably, the inner surface of the substrate is provided with a slider, the slider is T-shaped and located in the lower half of the substrate, and the inner end of the gripper is provided in a groove corresponding to the slider.

[0010] Preferably, the elastic element includes a sleeve disposed on the inner surface of the substrate, and the locking block is provided with a column and a limiting piece disposed at the end of the column;

[0011] The limiting piece is slidably connected to the inside of the sleeve. An end cap is provided at the end of the sleeve to restrict the limiting piece to be inside the sleeve. A spring is provided inside the sleeve to push the limiting piece so that the locking block is in the extended state.

[0012] The inner end of the gripper is formed with a slot, the slot is above the slide groove, and the latch is formed on the inner wall of the slot.

[0013] Preferably, the inner wall of the sleeve is rectangular, and the shape of the limiting piece corresponds to the inner wall of the sleeve.

[0014] Preferably, the card block is rectangular and its lower surface forms an arc surface on the side away from the column.

[0015] Preferably, the gripper has an insertion hole that passes through the bayonet and communicates with the outside.

[0016] The beneficial effects of this utility model are:

[0017] This invention involves inserting a slider into the groove at the inner end of the gripper. When the buffer plate descends, the locking block is in the locking position. The spring pushes the limiting plate to make the locking block extend into the locking position, thus completing the installation process of the buffer plate. Through the locking of the locking block and the locking position, the buffer plate will not move parallel to the chuck axis. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional exploded view of the gripper, buffer plate, elastic element, and locking block of this utility model. Figure 1 ;

[0021] Figure 3 This is a three-dimensional exploded view of the gripper, buffer plate, elastic element, and locking block of this utility model. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the internal structure of the gripper, buffer sheet, elastic element and locking block of this utility model.

[0023] The numbers on the map are:

[0024] 1-Chuck; 2-Gripper; 21-Grip; 22-Slide groove; 23-Slot; 24-Socket; 3-Buffer plate; 31-Base plate; 32-Rubber pad; 33-Slider; 4-Elastic element; 41-Sleeve; 42-Spring; 43-End cap; 44-Column; 45-Limiting plate; 5-Clamping block. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0026] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] This utility model proposes a positioning fixture for CNC lathes, such as... Figures 1 to 4 As shown, it includes a chuck 1 and jaws 2 distributed on the chuck 1. The jaws 2 are stepped and the highest point is close to the axis of the chuck 1.

[0028] The high point of the gripper 2 is the inner end. A buffer plate 3 is slidably arranged on the inner end of the gripper 2. A locking block 5 is arranged on the inner surface of the buffer plate 3. An elastic element 4 is arranged between the locking block 5 and the buffer plate 3. A locking slot 21 is opened on the inner end of the gripper 2.

[0029] The buffer sheet 3 includes a substrate 31 and a rubber pad 32 disposed on the outer surface of the substrate 31, and the surface of the rubber pad 32 is formed with anti-slip ripples.

[0030] The inner surface of the substrate 31 is provided with a slider 33, which is T-shaped and located in the lower half of the substrate 31. The inner end of the gripper 2 is provided in the groove 22 corresponding to the slider 33.

[0031] The elastic element 4 includes a sleeve 41 disposed on the inner surface of the substrate 31, and the locking block 5 is provided with a column 44 and a limiting piece 45 disposed at the end of the column 44.

[0032] The limiting piece 45 is slidably connected to the inside of the sleeve 41. The end of the sleeve 41 is provided with an end cap 43 to restrict the limiting piece 45 to be inside the sleeve 41. A spring 42 is provided inside the sleeve 41 to push the limiting piece 45 so that the locking block 5 is in the extended state.

[0033] The inner end of the gripper 2 has a slot 23, which is above the slide groove 22 and the slot 21 is formed on the inner wall of the slot 23.

[0034] The inner wall of the sleeve 41 is rectangular, and the shape of the limiting piece 45 corresponds to the inner wall of the sleeve 41.

[0035] The card block 5 is rectangular and its lower surface forms an arc surface on the side away from the column 44.

[0036] The gripper 2 has an insertion hole 24, which passes through the bayonet 21 and communicates with the outside.

[0037] In this embodiment, the operator can grasp the buffer plate 3 and insert the slider 33 into the groove 22 at the inner end of the gripper 2. During the insertion process, when the locking block 5, which is above the slider 33, enters the groove 23, the arc surface formed on the lower surface of the locking block 5 will press the locking block 5 between the arc surface and the upper wall of the gripper 2 and the groove 23 to form a retraction until the locking block 5 is in the position of the locking slot 21 after the locking block 5 has descended with the buffer plate 3. The spring 42 pushes the limiting plate 45 to make the locking block 5 extend into the locking slot 21, and at this time the installation process of the buffer plate 3 is completed.

[0038] Since the upper surface of the chuck block 5 is flat, the buffer plate 3 will not move in a direction parallel to the axis of the chuck 1.

[0039] The installation method of the locking block 5 and the elastic element 4 is as follows: the end cap 43 is sleeved on the column 44, and then one end of the column 44 is fixed to the locking block 5 by bolts. Then the limiting piece 45 is inserted into the sleeve 41 containing the spring 42, and the end cap 43 is fixed to the sleeve 41 by screwing.

[0040] The purpose of making the limiting piece 45 rectangular and the inside of the sleeve 41 rectangular is to avoid deflection caused by the circular shape.

[0041] Finally, when it is necessary to remove the buffer plate 3, a rod is passed through the socket 24 to press the locking block 5 to retract it, and at the same time the buffer plate 3 is pulled out.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0043] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A positioning fixture for a CNC lathe, comprising a chuck (1) and jaws (2) distributed on the chuck (1), characterized in that, The jaws (2) are stepped and the highest point is close to the axis of the chuck (1); The high end of the gripper (2) is the inner end. A buffer plate (3) is slidably provided on the inner end of the gripper (2). A locking block (5) is provided on the inner surface of the buffer plate (3). An elastic element (4) is provided between the locking block (5) and the buffer plate (3). A locking slot (21) is opened on the inner end of the gripper (2).

2. A positioning fixture for a CNC lathe according to claim 1, characterized in that, The buffer sheet (3) includes a substrate (31) and a rubber pad (32) disposed on the outer surface of the substrate (31), and the surface of the rubber pad (32) is formed with anti-slip ripples.

3. A positioning fixture for a CNC lathe according to claim 2, characterized in that, The inner surface of the substrate (31) is provided with a slider (33), the slider (33) is T-shaped and located in the lower half of the substrate (31), and the inner end of the gripper (2) is provided in the groove (22) corresponding to the slider (33).

4. A positioning fixture for a CNC lathe according to claim 3, characterized in that, The elastic element (4) includes a sleeve (41) disposed on the inner surface of the substrate (31), and the locking block (5) is provided with a column (44) and a limiting piece (45) disposed at the end of the column (44); The limiting piece (45) is slidably connected to the inside of the sleeve (41). The end of the sleeve (41) is provided with an end cap (43) to restrict the limiting piece (45) to be inside the sleeve (41). A spring (42) is provided inside the sleeve (41) to push the limiting piece (45) so that the locking block (5) is in the extended state. The inner end of the gripper (2) is formed with a slot (23), the slot (23) is above the slide (22) and the latch (21) is formed on the inner wall of the slot (23).

5. A positioning fixture for a numerically controlled lathe according to claim 4, characterized in that, The inner wall of the sleeve (41) is rectangular, and the shape of the limiting piece (45) corresponds to the inner wall of the sleeve (41).

6. A positioning fixture for a CNC lathe according to claim 1, characterized in that, The card block (5) is rectangular and its lower surface forms an arc surface on the side away from the column (44).

7. A positioning fixture for a CNC lathe according to claim 1, characterized in that, The gripper (2) has an insertion hole (24) which passes through the bayonet (21) and communicates with the outside.

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