CN210849337U

CN210849337U - Centre bore positioning mechanism for machining

Info

Publication number: CN210849337U
Application number: CN201921802748.8U
Authority: CN
Inventors: 王辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-26
Filing date: 2019-10-26
Publication date: 2020-06-26
Anticipated expiration: 2029-10-26

Abstract

The utility model discloses a centre bore positioning mechanism for machining mainly relates to the machining anchor clamps field. Comprises a mounting base used for being connected with a bottom plate of the clamp and a centering device used for positioning a central hole of a workpiece. The center hole positioning mechanism realizes the positioning of the center hole of the workpiece, is used for processing the mounting base surface of the workpiece, does not need to correct the coordinates of the center hole and the mounting base surface, can directly carry out mechanical processing on the mounting base surface, and has high clamping efficiency; the center hole positioning mechanism uses the cone to position the center hole of the workpiece, and the hole diameter of the center hole of the workpiece is positioned corresponding to different circular sections of the cone when fluctuating within a certain tolerance range, so that the working pressure of the preorder boring is reduced; the center hole positioning mechanism is provided with a spring, so that when different circular cross sections are used for center hole positioning, the end face of a center hole of a workpiece can be pressed against a positioning flat pad for center hole end face positioning; the center hole positioning mechanism does not need manual adjustment, is reliable in positioning, is suitable for production and manufacturing of workpieces in batches, and is high in clamping efficiency and low in labor intensity.

Description

Centre bore positioning mechanism for machining

Technical Field

The utility model relates to an anchor clamps field for machining specifically is a centre bore positioning mechanism for machining.

Background

In machining a workpiece, a large number of jigs are widely used in consideration of machining accuracy, machining efficiency, and the like. The jig is a device for fixing a processing object to take a correct position to receive construction or inspection in a machining process. By definition, it is one of the important roles of the workpiece to be machined, i.e., the workpiece, to occupy the correct position, and in production, workpieces with center holes are often encountered, and the distance from the center hole to the mounting base surface has strict dimensional tolerance requirements, and the position from the mounting base surface to the hole center needs to be strictly controlled when the mounting base surface is subjected to finish machining. The processing of the mounting base surface of the workpiece with the central hole generally adopts the following modes:

1. the method comprises the steps of correcting according to coordinate values, clamping a workpiece on a machine tool workbench, firstly aligning an installation base plane within a reasonable range, then aligning holes, punching a center coordinate of a center hole, then calculating according to the coordinate values and the drawing size, and then machining.

2. And a six-point positioning method is used, namely, the end surface of the hole and the corresponding plane are used for surface positioning, the mounting base surface is used for line positioning, the position of the mounting base surface in the whole processing system is controlled, and one point is selected on the side surface of the workpiece for point positioning. By using the method, the installation base surface is needed to be used for positioning, the installation base surface is also a processed surface, the positioning point on the installation base surface needs to be removed before processing, and the clamp is relatively complicated to apply; by using the method, coordinate correction is not carried out after the workpiece is clamped, mechanical processing is directly carried out, the position size precision of the mounting base surface can be effectively guaranteed after processing, but the method is influenced by the pre-sequence processing allowance and the processing precision, under the condition that the hole processing allowance is smaller, the problem of out-of-round hole processing can occur, the process allowance needs to be added to the central hole with larger processing difficulty when the surface processing position size with relatively smaller processing difficulty is guaranteed, and the fine processing of the central hole in the subsequent process is not facilitated; with this method, higher dimensional tolerance requirements cannot be achieved with the central bore already finished.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a centre bore positioning mechanism for machining, it has solved current area centre bore work piece and has installed the base surface finish machining, is difficult to the problem of accuracy, high-efficient clamping.

The utility model discloses a realize above-mentioned purpose, realize through following scheme:

a center hole positioning mechanism for machining comprises a mounting base mounted on a clamp base plate and a centering device for positioning a center hole of a workpiece;

furthermore, the mounting base is provided with a base, a dustproof sleeve, a positioning flat pad, a locking screw and a limiting screw, the positioning flat pad is locked on the base through the locking screw, the dustproof sleeve is pressed into a dustproof sleeve mounting groove of the base, the limiting screw is screwed into a screw hole of the base, and the base is locked on a clamp bottom plate through the screw;

further, the centering device comprises a positioning mandrel, a positioning cup, a gasket, a locking screw, a spring and an adjusting plug, the positioning mandrel is arranged in a positioning mandrel mounting hole of the base, the spring is arranged in a spring mounting hole of the positioning mandrel, the adjusting plug is screwed into an adjusting plug mounting screw hole of the base, a spring limiting groove of the adjusting plug is screwed into a certain depth after sleeving the outer diameter of the spring, the positioning mandrel and the limiting screw are adjusted to enable the limiting screw to be inserted into a key groove of the positioning mandrel, the positioning cup and the gasket are sequentially sleeved into a positioning short shaft of the positioning mandrel, and the positioning mandrel, the positioning cup and the gasket are locked by the locking screw to form rigid connection;

furthermore, the base is provided with a positioning column which is arranged in a positioning hole of the clamp bottom plate and used for determining the axis position of the central hole positioning mechanism;

further, the positioning mandrel is provided with a spring mounting hole, so that the elastic force of the spring directly acts on the axis of the positioning mandrel;

furthermore, the positioning mandrel is provided with a positioning short shaft, so that the positioning cup is sleeved in the positioning short shaft and then is coaxial with the positioning mandrel;

furthermore, the positioning cup is provided with a guide cone, and a workpiece can be smoothly loaded through the guide cone;

furthermore, the positioning cup is provided with a positioning cone, so that the aperture of the central hole of the workpiece is allowed to fluctuate within a certain tolerance range;

furthermore, the adjusting plug is provided with a spring limiting groove which limits the radial position of the spring together with the spring mounting hole of the positioning mandrel to prevent the spring from deviating, and after a workpiece is loaded into the adjusting plug, the centering device only moves axially along the positioning mandrel mounting hole to enable the positioning cone of the positioning cup to tightly push against the central hole of the workpiece, so that the clamping of the positioning mandrel is avoided;

furthermore, the adjusting plug is provided with an external thread, so that the adjusting plug can be screwed in and screwed out conveniently in an adjusting plug mounting screw hole of the base, the pre-compression stroke of the spring is adjusted, and the pressure of the spring is preset;

furthermore, the mounting base is provided with a dustproof sleeve which is tightly contacted with the outer diameter of the positioning mandrel, so that machining chips and cooling liquid can be effectively prevented from entering a contact gap between the positioning mandrel and a positioning mandrel mounting hole in the base, and the maintenance period and the service life of the central hole positioning mechanism are prolonged;

furthermore, the positioning mandrel is provided with a key groove, and the key groove is matched with the limit screw for use, so that the free rotation of the positioning mandrel can be limited, and the initial position of the positioning mandrel in the axial direction under the elastic force action of the spring is controlled;

furthermore, the positioning flat pad is locked on the base, after the central hole of the workpiece is pressed against the positioning cone of the positioning cup, the spring is stressed and compressed, the workpiece moves downwards, and the end face of the central hole of the workpiece is tightly pressed on the positioning flat pad to position the end face of the central hole of the workpiece.

The beneficial effects of the utility model

1. The workpiece center hole is used for positioning, so that the dimensional tolerance of the distance from the installation base surface to the center hole is effectively guaranteed;

2. after the workpiece is clamped, the center hole coordinates do not need to be corrected, the mounting base surface can be directly machined, and the clamping efficiency is high;

3. the conical surface is used for positioning, when the aperture of the central hole of the workpiece fluctuates within a certain tolerance range, the positioning is carried out corresponding to different conical sections, the adaptability to the diameter size of the central hole of the workpiece is good, and the working pressure of the preorder boring is reduced;

4. the center hole positioning mechanism does not need manual adjustment, is reliable in positioning, is suitable for production and manufacturing of workpieces in batches, improves clamping efficiency and reduces labor intensity;

drawings

Fig. 1 is a structural sectional view of the application principle of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a base structure diagram of the utility model No. 1.

Fig. 4 is a drawing of the positioning mandrel structure of the utility model No. 5.

Fig. 5 is a schematic diagram of the application of the present invention.

Reference numerals shown in the drawings:

1. a base; 1-1, adjusting a screwed plug installation screw hole; 1-2, a positioning column; 1-3, screw holes; 1-4, positioning a mandrel mounting hole; 1-5, mounting grooves for dust covers; 2. a dust-proof sleeve; 3. positioning the flat pad; 4. locking the first screw; 5. positioning the mandrel; 5-1, a key groove; 5-2, screw holes; 5-3, spring mounting holes; 5-4, positioning a short shaft; 6. positioning the cup; 6-1, a guide cone; 6-2, positioning a cone; 7. a gasket; 8. a second locking screw; 9. a spring; 10. adjusting a screwed plug; 10-1, a spring limiting groove; 11. a limit screw; 12. a workpiece; 12-1, a central hole; 12-2, mounting a base surface; 12-3 and the end face of the central hole.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.

A centre bore positioning mechanism for machining, including being used for installing the mounting base on the anchor clamps bottom plate, being used for the centring means of work piece centre bore location.

Specifically, the mounting base is provided with a base 1, a dustproof sleeve 2 is mounted in a dustproof sleeve mounting groove 1-5, a positioning flat gasket 3 is locked on the base 1 through a locking screw I4, a limiting screw 11 is preassembled on the base 1, a centering device is mounted on the base 1, and the mounting base is locked on a clamp bottom plate through screws;

specifically, the centering device comprises a positioning mandrel 5, a positioning cup 6, a gasket 7, a locking screw II 8, a spring 9 and an adjusting plug 10, the positioning mandrel 5 is arranged in a positioning mandrel mounting hole 1-4, the spring 9 is arranged in a spring mounting hole 5-3, the adjusting plug 10 is screwed into an adjusting plug mounting screw hole 1-1, a spring limiting groove 10-1 is screwed into the spring 9 after being sleeved with the spring 9 to a certain depth, the positioning mandrel 5 and the limiting screw 11 are adjusted to enable the limiting screw 11 to be inserted into a key groove 5-1, the positioning cup 6 and the gasket 7 are sequentially sleeved into a positioning short shaft 5-4, and the positioning mandrel 5, the positioning cup 6 and the gasket 7 are locked by the locking screw II 8 and the screw hole 5-2 to form rigid connection;

more specifically, the base 1 is provided with a positioning column 1-2 which is arranged in a positioning hole of the clamp bottom plate and used for determining the axis position of the central hole positioning mechanism;

more specifically, the positioning mandrel 5 is provided with a spring mounting hole 5-3, so that the elastic force of the spring 9 directly acts on the axis of the positioning mandrel 5;

more specifically, the positioning mandrel 5 is provided with a positioning short shaft 5-4, so that the positioning cup 6 is sleeved in the positioning short shaft 5-4 and then the positioning cup 6 is ensured to be coaxial with the positioning mandrel 5;

more specifically, the positioning cup 6 is provided with a guide cone 6-1, and the workpiece 12 can be smoothly loaded through the guide cone 6-1;

more specifically, the positioning cup 6 is provided with a positioning cone 6-2, which allows the aperture of the central hole 12-1 to fluctuate within a certain tolerance range;

more specifically, the adjusting plug 10 is provided with a spring limiting groove 10-1 which limits the radial position of the spring together with the spring mounting hole 5-3 to prevent the spring 9 from deviating, and after the workpiece 12 is installed, the centering device only moves axially along the positioning mandrel mounting hole 1-4 to enable the positioning cone 6-2 to tightly push against the central hole 12-1, so that the positioning mandrel 5 is prevented from being clamped;

more specifically, the adjusting plug 10 is provided with external threads, can be screwed in and out conveniently above the adjusting plug mounting screw hole 1-1, adjusts the pre-compression stroke of the spring 9, and presets the spring pressure;

more specifically, the installation base is provided with the dustproof sleeve 2 which is tightly contacted with the outer diameter of the positioning mandrel 5, so that machining chips and cooling liquid can be effectively prevented from entering contact gaps of the positioning mandrel 5 and the positioning mandrel installation holes 1-4, and the maintenance period and the service life of the central hole positioning mechanism are prolonged;

more specifically, the positioning mandrel 5 is provided with a key slot 5-1 which is matched with a limit screw 11 for use, so that the free rotation of the positioning mandrel 5 can be limited, and the initial position of the positioning mandrel 5 in the axial direction under the action of the elastic force of a spring 9 is controlled;

more specifically, the positioning flat pad 3 is locked on the base 1, after the central hole 12-1 is pressed on the positioning cone 6-2, the spring 9 is compressed under the force, the workpiece 12 moves downwards, the end face 12-3 of the central hole is pressed on the upper plane of the positioning flat pad 3, and the end face 12-3 of the central hole is positioned.

Working mode

A central hole 12-1 of a workpiece 12 is inserted into the positioning cup 6 and is contacted with the positioning cone 6-2, the central hole 12-1 is combined with the circular section of the positioning cone 6-2, under the action of the weight of the workpiece 12, a spring 9 of the centering device is compressed, a central hole end face 12-3 of the workpiece 12 is contacted with the upper plane of the positioning flat pad 3, the positioning of the central hole 12-1 and the central hole end face 12-3 is completed, and a machine tool processes an installation base face 12-2 according to the coordinate of the axis of the positioning cup 6 calibrated during the installation of the clamp; after the machining is finished, the workpiece 12 is moved away, the positioning mandrel 5 moves upwards along the axial direction under the action of the elastic force of the spring 9, and the central hole positioning mechanism resets.

Claims

1. The utility model provides a centre bore positioning mechanism for machining which characterized in that: the fixture comprises a mounting base connected to a bottom plate of the fixture, wherein a centering device for positioning a central hole of a workpiece is arranged on the mounting base;

the mounting base comprises a base (1); a dust-proof cover (2); a positioning flat pad (3); a first locking screw (4); a limit screw (11);

the centering device comprises a positioning mandrel (5); a positioning cup (6); a washer (7); a second locking screw (8); a spring (9); adjusting the plug (10).

2. The center hole positioning mechanism for machining according to claim 1, wherein the base (1) is provided with positioning columns (1-2) which are arranged in positioning holes of a bottom plate of the fixture.

3. A positioning mechanism for a center hole in machining according to claim 1, characterized in that the positioning mandrel (5) has a key slot (5-1) for cooperating with the limit screw (11), and the limit screw (11) is inserted into the key slot (5-1).

4. The center hole positioning mechanism for machining according to claim 1, wherein the positioning mandrel (5) is provided with a positioning short shaft (5-4) and a screw hole (5-2), the positioning cup (6) and the washer (7) are sequentially sleeved on the positioning short shaft (5-4), and the locking screw II (8) is screwed on the screw hole (5-2).

5. The center hole positioning mechanism for machining according to claim 1, wherein the positioning mandrel (5) is provided with a spring mounting hole (5-3), the spring (9) is arranged in the spring mounting hole (5-3), the adjusting screw plug (10) is provided with a spring limiting groove (10-1), and the spring limiting groove (10-1) is sleeved on the outer diameter of the spring (9).

6. A machining center hole positioning mechanism according to claim 1, characterized in that the positioning cup (6) is provided with a positioning cone (6-2).

7. The center hole positioning mechanism for machining according to claim 1, wherein the adjusting plug (10) has an external thread, the base (1) has an adjusting plug mounting screw hole (1-1), and the adjusting plug (10) can be screwed in and out in the adjusting plug mounting screw hole (1-1).

8. The center hole positioning mechanism for machining according to claim 1, wherein the base (1) is provided with positioning posts (1-2) which are arranged in positioning holes of a bottom plate of the fixture to determine the axial position of the centering device.