Clamping device for thin-wall long sleeve type workpiece

Abstract

The utility model provides a clamping device for a thin-wall long sleeve type workpiece, and belongs to the technical field of machinery. The problem that deformation is prone to occurring in the machining process due to the poor clamping effect is solved. The mandrel is fixed in the connecting base, the front end of the mandrel extends out of the connecting base, the elastic clamping sleeve is located between the mandrel and the connecting base and can move front and back, the front end of the elastic clamping sleeve shrinks inwards when the elastic clamping sleeve moves backwards, the rear end of the mandrel is sleeved with an annular supporting block in a sliding mode, and the outer side face of the supporting block is a conical face. The outer diameter of the supporting block is gradually increased from front to back, and a spring is arranged between the rear end of the supporting block and the connecting base in an abutting mode. The clamp has the advantages of being good in clamping effect, not prone to deformation during machining and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical technical field relates to a clamping device especially relates to a kind of clamping device for thin-walled long sleeve class workpiece. BACKGROUND

[0002] In existing machining, for the workpiece with certain length, it is very common to use elastic sleeve to clamp. Especially for shaft or thick-walled pipe parts, because the workpiece is thick-walled, only relying on elastic sleeve to clamp can have good clamping effect, and it is not easy to deform during machining.

[0003] However, for the thin-walled long sleeve workpiece, which is closed at one end, in addition to using elastic sleeve, a mandrel is also used to support the inner bottom wall of the workpiece. However, because the wall thickness of this kind of workpiece is very thin, only using elastic sleeve to clamp, the open end is in a suspended state along the radial direction, that is, it does not form effective support, and it is easy to deform during actual machining. SUMMARY

[0004] The utility model discloses a kind of clamping devices for thin-walled long sleeve class workpiece, solve the problem that the clamping effect is not good and leads to deformation during machining.

[0005] The utility model discloses a kind of clamping devices for thin-walled long sleeve class workpiece, solve the problem that the clamping effect is not good and leads to deformation during machining.

[0006] A kind of clamping device for thin-walled long sleeve class workpiece, including connecting seat, fixed in connecting seat and the mandrel with front end protruding outside connecting seat and the elastic sleeve between mandrel and connecting seat and can move back and forth, when elastic sleeve moves back, its front end contracts inward, it is characterized in that, the annular support block of the mandrel rear end outer sliding sleeve is equipped with, the outer side of support block is conical surface, the outer diameter of support block gradually increases from front to back, spring is arranged between the rear end of support block and connecting seat.

[0007] The clamping device is used for thin-walled long sleeve type workpieces, and a connecting seat is fixedly connected to the front end of a machine tool spindle. The movement of the elastic sleeve is driven by the piston of the cylinder / hydraulic cylinder inside the machine tool spindle. When clamping, the open end of the thin-walled long sleeve type workpiece is inserted into the inside bottom wall of the thin-walled long sleeve type workpiece and abuts against the front end of the mandrel from the space between the elastic sleeve and the mandrel. The open end of the thin-walled long sleeve type workpiece abuts against the outside wall of the supporting block. Then, the elastic sleeve is driven by the cylinder / hydraulic cylinder inside the machine tool spindle to move backward, so that the front end of the elastic sleeve is retracted inward and clamped on the outside of the thin-walled long sleeve type workpiece near the closed end. After processing is completed, the elastic sleeve is driven by the cylinder / hydraulic cylinder inside the machine tool spindle to move forward, so that the front end of the elastic sleeve is reset and expanded outward, and the thin-walled long sleeve type workpiece is loosened.

[0008] The clamping device can support the open end of the thin-walled long sleeve type workpiece from the inside by setting the supporting block outside the rear end of the mandrel. In combination with the radial clamping of the closed end of the thin-walled long sleeve type workpiece from the outside when the front end of the elastic sleeve is retracted inward, the support rigidity is obviously improved, so that the clamping firmness of the thin-walled long sleeve type workpiece is improved, and deformation of the thin-walled long sleeve type workpiece during processing is avoided. At the same time, the outside of the supporting block is a tapered surface, and the supporting block is in a floating state abutting against the spring, so that over-positioning is avoided. Over-positioning refers to that the internal diameter of the thin-walled long sleeve type workpiece will have errors during processing. If the position of the supporting block is fixed, the open end of the thin-walled long sleeve type workpiece will abut against the supporting block, but the front end of the mandrel will not abut against the inside bottom wall of the thin-walled long sleeve type workpiece. By setting the supporting block in a floating state, the front end of the mandrel can abut against the inside wall of the thin-walled long sleeve type workpiece by pushing the supporting block backward.

[0009] In the clamping device for thin-walled long sleeve type workpieces, the supporting block is a nylon piece.

[0010] The supporting piece is a nylon piece, which can support the open end of the thin-walled long sleeve type workpiece radially and also play a shock-absorbing role during processing.

[0011] In the clamping device for thin-walled long sleeve type workpieces, the rear end surface of the supporting block is uniformly provided with a plurality of positioning holes around the mandrel, and the number of springs is a plurality, and the front end of each spring is located in each positioning hole.

[0012] The plurality of springs and positioning holes can ensure that the supporting block will not be skewed when it is pushed backward, improving the reliability of the structure.

[0013] In the clamping device for long thin-walled sleeve workpiece, the core shaft is externally threaded with a stop ring, and the front end of the support block is abutted against the stop ring.

[0014] The stop ring is externally threaded on the core shaft, and the front end of the support block is abutted against the stop ring, so that the support block is prevented from being removed from the core shaft while being in a floating state.

[0015] In the clamping device for long thin-walled sleeve workpiece, the rear end of the connecting seat is provided with a plurality of connecting rods in the front-rear direction, the rear end of the elastic sleeve is fixedly connected with the connecting rods, the rear end of each connecting rod is fixedly connected with a connecting plate, and the rear end of the connecting plate is fixedly connected with a pull rod.

[0016] In the clamping device for long thin-walled sleeve workpiece, the core shaft comprises a shaft body and a positioning block fixedly connected to the front end of the shaft body, and the front end of the positioning block is provided with a recessed accommodation cavity.

[0017] The core shaft is capable of cooperating with the support block to position the long thin-walled sleeve workpiece along the axis. By providing the recessed accommodation cavity in the positioning block at the front end of the core shaft, if the long thin-walled sleeve workpiece has a protruding part in the central region of the inner bottom wall, the accommodation cavity can accommodate the protruding part, thereby ensuring reliable positioning.

[0018] Compared with the prior art, the clamping device for long thin-walled sleeve workpiece can radially support the open end of the long thin-walled sleeve workpiece from the inside by providing the support block at the rear end of the core shaft, and can radially clamp the closed end of the long thin-walled sleeve workpiece from the outside by the elastic sleeve when the front end of the elastic sleeve is inwardly retracted. The cooperation of the two can significantly improve the support rigidity, thereby improving the clamping firmness of the long thin-walled sleeve workpiece and preventing deformation of the long thin-walled sleeve workpiece during machining.

[0019] Meanwhile, the outer side surface of the support block is a tapered surface, and the support block is in a floating state abutted against the spring, so that over-positioning can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the clamping device for long thin-walled sleeve workpiece.

[0021] In the figure, 1 is the connecting seat; 1a is the guide cone surface; 2 is the mandrel; 2a is the shaft body; 2b is the positioning block; 2b1 is the relief cavity; 3 is the elastic sleeve; 3a is the connecting sleeve; 3a1 is the snap-fit ​​part; 3b is the elastic chuck; 3b1 is the annular groove; 4 is the connecting rod; 5 is the connecting plate; 6 is the pull rod; 7 is the support block; 7a is the positioning hole; 8 is the spring; 9 is the retaining ring; and 10 is a thin-walled long sleeve-type workpiece. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, a clamping device for thin-walled long sleeve-type workpieces includes a connecting seat 1, a mandrel 2 fixed inside the connecting seat 1 with its front end extending outside the connecting seat 1, and an elastic sleeve 3 located between the mandrel 2 and the connecting seat 1 and movable back and forth. When the elastic sleeve 3 moves backward, its front end retracts inward. Several connecting rods 4 are threaded through the rear end of the connecting seat 1 along the front-back direction, and the connecting rods 4 are evenly distributed circumferentially. The rear end of the elastic sleeve 3 is fixedly connected to each connecting rod 4, and the rear end of each connecting rod 4 is fixedly connected to a connecting plate 5. A pull rod 6 is fixedly connected to the rear end of the connecting plate 5. The elastic sleeve 3 includes a connecting sleeve 3a and an elastic clamp 3b. The rear end of each connecting rod 4 is fixedly connected to the connecting sleeve 3a. The rear end of the elastic clamp 3b is rotatably engaged with the front end of the connecting sleeve 3a. Specifically, an annular groove 3b1 is provided on the outer side of the rear end of the elastic clamp 3b, and a clearance groove communicating with the annular groove 3b1 is provided at the rear end of the elastic clamp 3b. The inner side of the front end of the connecting sleeve 3a has a locking part 3a1, which is located in the annular groove 3b1. When the elastic clamp 3b rotates relative to the connecting sleeve 3a until the locking part 3a1 is located at the communication point between the annular groove 3b1 and the clearance groove, the elastic clamp 3b can be detached from the connecting sleeve 3a. The inner side of the front end of the connecting seat 1 has a guide cone surface 1a that abuts against the cone surface on the outer side of the elastic clamp 3b. The spindle 2 includes a shaft body 2a and a positioning block 2b fixedly connected to the front end of the shaft body 2a. The front end of the positioning block 2b has a rearwardly recessed clearance cavity 2b1.

[0024] Furthermore, such as Figure 1As shown, the outer sliding sleeve at the rear end of the mandrel 2 is provided with an annular support block 7, the support block 7 is a nylon piece, the outer side surface of the support block 7 is a conical surface, the outer diameter of the support block 7 gradually increases from front to rear, and the rear end of the support block 7 is abutted with the connecting seat 1. A spring 8 is arranged between the rear end of the support block 7 and the connecting seat 1. The rear end surface of the support block 7 is uniformly provided with a plurality of positioning holes 7a around the mandrel 2, and the number of springs 8 is several. The front end of each spring 8 is located in each positioning hole 7a. The outer side of the shaft body 2a of the mandrel 2 is threadedly connected with a check ring 9, the front end of the support block 7 abuts against the check ring 9, and through such arrangement, the support block 7 can be in a floating state while not falling off from the mandrel 2.

[0025] The clamping device is used for thin-walled long sleeve type workpiece 10, the connecting seat 1 is fixedly connected to the front end of the machine tool spindle, the pull rod 6 is fixedly connected with the piston of the cylinder / hydraulic cylinder inside the machine tool spindle, and when clamping, the opening one end of the thin-walled long sleeve type workpiece 10 is inserted into the inside bottom wall of the thin-walled long sleeve type workpiece 10 from the space between the elastic sleeve 3 and the mandrel 2, and the front end of the mandrel 2 abuts against the outside wall of the support block 7. The positioning block 2b at the front end of the mandrel 2 can be positioned for the protruding part in the center area of the inside bottom wall of the thin-walled long sleeve type workpiece 10, and the opening one end of the thin-walled long sleeve type workpiece 10 abuts against the outside wall of the support block 7. Then, the pull rod 6 is moved backward by the cylinder / hydraulic cylinder inside the machine tool spindle, so that the pull rod 6 moves backward with the elastic sleeve 3 to make the front end of the elastic sleeve 3 contract inward and clamp the outside surface of the thin-walled long sleeve type workpiece 10 at the position close to the closed end. After processing, the pull rod 6 is moved forward by the cylinder / hydraulic cylinder inside the machine tool spindle, so that the pull rod 6 moves forward with the elastic sleeve 3 to make the front end of the elastic sleeve 3 reset and expand outward to release the thin-walled long sleeve type workpiece 10.

[0026] The clamping device can support the open end of the thin-walled long sleeve workpiece 10 from the inside by setting the support block 7 outside the rear end of the mandrel 2, and can clamp the closed end of the thin-walled long sleeve workpiece 10 from the outside by the inward contraction of the front end of the elastic sleeve 3, so that the support rigidity is obviously improved, and the clamping firmness of the thin-walled long sleeve workpiece 10 is improved, and the deformation of the thin-walled long sleeve workpiece 10 during the machining process is avoided. At the same time, the outer side of the support block 7 is a conical surface, and the support block 7 is in a floating state in abutment with the spring 8, so that the over-positioning condition is avoided. The over-positioning refers to the error of the internal diameter of the thin-walled long sleeve workpiece 10 during the machining process. If the position of the support block 7 is fixed, the open end of the thin-walled long sleeve workpiece 10 will abut against the support block 7, but the front end of the mandrel 2 will not abut against the inner bottom wall of the thin-walled long sleeve workpiece 10. By setting the support block 7 in a floating state, the mandrel 2 can abut against the inner wall of the thin-walled long sleeve workpiece 10 by the backward pushing of the support block 7.

[0027] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A clamping device for thin-walled long sleeve-type workpieces, comprising a connecting seat (1), a mandrel (2) fixed inside the connecting seat (1) and extending outward from the connecting seat (1), and an elastic sleeve (3) located between the mandrel (2) and the connecting seat (1) and movable back and forth, wherein the front end of the elastic sleeve (3) retracts inward when it moves backward, characterized in that, The rear end of the core shaft (2) is externally sleeved with an annular support block (7), the outer side surface of the support block (7) is a conical surface, the outer diameter of the support block (7) gradually increases from front to rear, and a spring (8) is arranged in abutment between the rear end of the support block (7) and the connecting seat (1).

2. A clamping device for thin-walled long sleeve type workpieces according to claim 1, characterized in that, The support block (7) is a nylon piece.

3. A clamping device for thin-walled long sleeve type workpieces according to claim 2, characterized in that, The rear end surface of the support block (7) is uniformly provided with a plurality of positioning holes (7a) around the core shaft (2), and the number of the springs (8) is a plurality, and the front ends of the springs (8) are respectively located in the positioning holes (7a).

4. A clamping device for thin-walled long sleeve type workpieces according to claim 3, characterized in that, The core shaft (2) is externally threadedly connected with a check ring (9), and the front end of the support block (7) abuts against the check ring (9).

5. A clamping device for thin-walled long sleeve type workpieces according to claim 1 or 2 or 3 or 4, characterized in that, The rear end of the connecting seat (1) is provided with a plurality of connecting rods (4) in the front-rear direction, the connecting rods (4) are uniformly distributed in the circumferential direction, the rear end of the elastic clamping sleeve (3) is fixedly connected with the connecting rods (4), the rear end of each connecting rod (4) is fixedly connected with a connecting plate (5), and the rear end of the connecting plate (5) is fixedly connected with a pull rod (6).

6. A clamping device for thin-walled long sleeve type workpieces according to claim 1 or 2 or 3 or 4, characterized in that, The core shaft (2) comprises a shaft body (2a) and a positioning block (2b) fixedly connected to the front end of the shaft body (2a), and the front end of the positioning block (2b) has a rearward recessed accommodation cavity (2b1).

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