Self-centering clamp mechanism for special-shaped thin-wall casting box body

Abstract

The utility model relates to a self-centering clamp mechanism for a special-shaped thin-wall casting box body, and belongs to the field of machining. Comprising a body 1 fixedly connected to a four-jaw chuck; the self-centering adjusting mechanism is arranged in a central hole of the body 1; the positioning column 5 is arranged on the end face of the self-centering adjusting mechanism; axial pressure is applied to the end face of the positioning disc 4 by manually screwing the trapezoidal screw 6, the conical elastic sleeve 3 is pushed to move inwards along the axis, the conical elastic sleeve 3 is expanded in the radial direction and supports the inner hole of the box body, clamping of the box body is achieved, operation is convenient and fast, the machining preparation time can be effectively shortened, and the batch production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and in particular relates to a self-centering clamp mechanism for a special-shaped thin-wall casting box. Background Art

[0002] Gear transmission and worm transmission are common transmission mechanisms, which are usually assembled in the transmission box to realize the mechanism action. The transmission box is designed with multiple coaxial holes for installation, and the structure is relatively complex. In actual production, most of them are cast structures. Compared with the milling and boring processing of the milling machining center, the use of CNC lathes to process rotary holes is more efficient and more economical. Therefore, hole processing is mostly carried out on CNC lathes.

[0003] During the production process, due to the complex structural features of the casting box, it is difficult to clamp, and the inner hole is often used as the reference for clamping. Among them, the three-jaw chuck has the characteristics of self-centering, simple and convenient operation, but it is not suitable for clamping heavy parts; the four-jaw chuck has a strong clamping force and is suitable for clamping blanks, irregularly shaped parts or heavier parts. The disadvantage is that the clamping of each jaw needs to be adjusted one by one and multiple times to achieve the purpose of tightening, and the processing preparation time is long, which is not suitable for mass production. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is: to provide a self-centering clamp mechanism for a special-shaped thin-wall casting box body for solving the problem of low batch production efficiency of the existing clamping method.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a self-centering fixture mechanism for a special-shaped thin-walled casting box, comprising: a body 1, fixedly connected to a four-jaw chuck; a self-centering adjustment mechanism, arranged in the center hole of the body 1; a positioning column 5, arranged on the end surface of the self-centering adjustment mechanism;

[0008] The center of the body 1 is coaxial with the center of the four-jaw chuck and is fixed to the end face of the four-jaw chuck of the lathe. A threaded hole is provided in the center of the body 1 for installing a self-centering adjustment mechanism, and four U-shaped grooves are provided on the circumference.

[0009] The self-centering adjustment mechanism comprises: a positioning shaft 2, a conical elastic sleeve 3, a positioning plate 4, a trapezoidal screw 6, and a sleeve 7;

[0010] The positioning shaft 2 is arranged in the center hole of the body 1, a stepped threaded through hole is arranged inside the positioning shaft 2, a sleeve 7 is arranged at the center, the right outer circle of the positioning shaft 2 is a threaded surface, and the left outer circle is a tapered surface;

[0011] The conical elastic sleeve 3 is a circular ring structure, the outer circle of which matches the inner hole of the clamped part, and the inner hole is a conical surface that matches the outer conical surface of the positioning shaft 2;

[0012] The positioning plate 4 is arranged on the end surface of the conical elastic sleeve 3, and the end surface is evenly provided with 3 countersunk holes and a through hole is provided in the center;

[0013] The trapezoidal screw 6 is arranged in the central threaded hole of the positioning shaft 2, the outer circle of the left end is a trapezoidal thread, which is connected with the sleeve 7, and the right end is provided with a square hole for installing a torque wrench for adjustment.

[0014] Wherein, a first anti-loosening screw 8 is provided between the positioning shaft 2 and the sleeve 7;

[0015] A second anti-loosening screw 9 is provided between the body 1 and the positioning shaft 2 .

[0016] The positioning posts 5 are arranged on the end surface of the positioning plate 4, and there are three of them, evenly spaced along the circumference, for axial positioning of the box.

[0017] The size of the central through hole of the positioning plate 4 is larger than the diameter of the screw portion of the trapezoidal screw 6, and the clearance between the central through hole and the screw portion of the trapezoidal screw 6 is set to 0.5mm-1mm.

[0018] Among them, four I-shaped grooves are evenly distributed on the outer circumference of the positioning shaft 2, and the I-shaped grooves are symmetrically distributed on the left and right. When the positioning shaft 2 is subjected to axial force, the I-shaped grooves expand, driving the outer circumference of the conical elastic sleeve 3 to become larger.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1) Convenient and fast operation: The clamping diameter can be adjusted by manually rotating the trapezoidal screw using a tool. The operation is convenient and the processing preparation time is greatly shortened;

[0022] 2) Flexibility and universality: The clamping diameter of the self-centering adjustment mechanism can be adjusted within a certain range to match the clamping of inner holes of different diameters. When producing multiple varieties and small batches, when the adjustment range is exceeded, the fixture body can be universal, without the need to make multiple sets of tooling. By replacing self-centering adjustment mechanisms of different diameters, different parts can be clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 for Figure 1 Section view. DETAILED DESCRIPTION

[0025] In order to make the purpose, content, and advantages of the utility model clearer, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments.

[0026] This embodiment provides a self-centering fixture mechanism for a special-shaped thin-walled casting box, comprising: a body 1, fixedly connected to a four-jaw chuck; a self-centering adjustment mechanism, arranged in the center hole of the body 1; a positioning column 5, arranged on the end surface of the self-centering adjustment mechanism;

[0027] The center of the body 1 is coaxial with the center of the four-jaw chuck and is fixed to the end face of the four-jaw chuck of the lathe. A threaded hole is provided in the center of the body 1 for installing a self-centering adjustment mechanism, and four U-shaped grooves are provided on the circumference.

[0028] The self-centering adjustment mechanism comprises: a positioning shaft 2, a conical elastic sleeve 3, a positioning plate 4, a trapezoidal screw 6, and a sleeve 7;

[0029] The positioning shaft 2 is arranged in the center hole of the body 1, a stepped threaded through hole is arranged inside the positioning shaft 2, a sleeve 7 is arranged at the center, the right outer circle of the positioning shaft 2 is a threaded surface, and the left outer circle is a tapered surface;

[0030] The conical elastic sleeve 3 is a circular ring structure, the outer circle of which matches the inner hole of the clamped part, and the inner hole is a conical surface that matches the outer conical surface of the positioning shaft 2;

[0031] The positioning plate 4 is arranged on the end surface of the conical elastic sleeve 3, and the end surface is evenly provided with 3 countersunk holes and a through hole is provided in the center;

[0032] The trapezoidal screw 6 is arranged in the central threaded hole of the positioning shaft 2, the outer circle of the left end is a trapezoidal thread, which is connected with the sleeve 7, and the right end is provided with a square hole for installing a torque wrench for adjustment.

[0033] Wherein, a first anti-loosening screw 8 is provided between the positioning shaft 2 and the sleeve 7;

[0034] A second anti-loosening screw 9 is provided between the body 1 and the positioning shaft 2 .

[0035] The positioning posts 5 are arranged on the end surface of the positioning plate 4, and there are three of them, evenly spaced along the circumference, for axial positioning of the box.

[0036] The size of the central through hole of the positioning plate 4 is larger than the diameter of the screw portion of the trapezoidal screw 6, and the clearance between the central through hole and the screw portion of the trapezoidal screw 6 is set to 0.5mm-1mm.

[0037] Among them, four I-shaped grooves are evenly distributed on the outer circumference of the positioning shaft 2, and the I-shaped grooves are symmetrically distributed on the left and right. When the positioning shaft 2 is subjected to axial force, the I-shaped grooves expand, driving the outer circumference of the conical elastic sleeve 3 to become larger.

[0038] Working principle and working process:

[0039] When in use, the fixture is rigidly mounted on the four-jaw chuck of the lathe by screws;

[0040] Insert the torque wrench into the square hole on the end face of the trapezoidal screw 6, turn the torque wrench clockwise, adjust the trapezoidal screw 6 to push the positioning plate 4 to move axially inward, and generate an axial pressure on the end face of the conical elastic sleeve 3. Since the conical surface of the inner hole of the conical elastic sleeve 3 cooperates with the outer conical surface of the positioning shaft 2, the conical elastic sleeve 3 expands radially, tightens the inner hole of the part, and completes the clamping of the part.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A self-centering fixture mechanism for a special-shaped thin-walled casting box, characterized in that: include: The body (1) is fixedly connected to the four-jaw chuck; the self-centering adjustment mechanism is arranged in the center hole of the body (1); the positioning column (5) is arranged on the end surface of the self-centering adjustment mechanism; The center of the body (1) is coaxial with the center of the four-jaw chuck and is fixed to the end face of the four-jaw chuck of the lathe. A threaded hole is provided in the center of the body (1) for installing a self-centering adjustment mechanism, and four U-shaped grooves are provided on the circumference. The self-centering adjustment mechanism comprises: a positioning shaft (2), a conical elastic sleeve (3), a positioning plate (4), a trapezoidal screw (6), and a sleeve (7); The positioning shaft (2) is arranged in the central hole of the body (1), a stepped threaded through hole is arranged inside the positioning shaft (2), a sleeve (7) is arranged at the center, the right outer circle of the positioning shaft (2) is a threaded surface, and the left outer circle is a tapered surface; The conical elastic sleeve (3) is a circular ring structure, the outer circle of which matches the inner hole of the clamped part, and the inner hole is a conical surface that matches the outer conical surface of the positioning shaft (2); The positioning plate (4) is arranged on the end surface of the conical elastic sleeve (3), the end surface is evenly provided with three countersunk holes, and a through hole is provided in the center; The trapezoidal screw (6) is arranged in the central threaded hole of the positioning shaft (2), the outer circle of the left end is a trapezoidal thread, which is matched and connected with the sleeve (7), and the right end is provided with a square hole for installing a torque wrench.

2. The self-centering fixture mechanism for a special-shaped thin-walled casting box as claimed in claim 1, characterized in that: A first anti-loosening screw (8) is provided between the positioning shaft (2) and the sleeve (7); A second anti-loosening screw (9) is provided between the body (1) and the positioning shaft (2).

3. The self-centering fixture mechanism for a special-shaped thin-walled casting box as claimed in claim 1, characterized in that: The positioning posts (5) are arranged at three locations on the end surface of the positioning plate (4), evenly spaced along the circumference, and are used for axial positioning of the box body.

4. The self-centering fixture mechanism for a special-shaped thin-walled casting box as claimed in claim 1, characterized in that: The size of the central through hole of the positioning plate (4) is larger than the diameter of the screw rod portion of the trapezoidal screw (6), and the clearance between the central through hole and the screw rod portion of the trapezoidal screw (6) is set to 0.5 mm-1 mm.

5. The self-centering fixture mechanism for a special-shaped thin-walled casting box as claimed in claim 1, characterized in that: The outer circumferential surface of the positioning shaft (2) is evenly provided with four straight grooves, the straight grooves being symmetrically distributed on the left and right. When the positioning shaft (2) is subjected to an axial force, the straight grooves expand, driving the outer circumference of the conical elastic sleeve (3) to become larger.

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