CN115351569A

CN115351569A - Internal expansion centering clamp

Info

Publication number: CN115351569A
Application number: CN202211064187.2A
Authority: CN
Inventors: 施雷; 奚锦霞; 肖东进
Original assignee: Impro China Ltd
Current assignee: Impro China Ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2022-11-18

Abstract

The invention relates to the technical field of part processing, in particular to an internal expansion centering fixture which can eliminate the error influence of the size of a blank positioning reference hole and improve the positioning precision and the processing quality.

Description

Internal expansion centering fixture

Technical Field

The invention relates to the technical field of part machining, in particular to an internal expansion centering clamp.

Background

Automobile parts are different from each other, and parts such as a bracket are high in precision requirement due to complex shapes. Under the condition of high rotating speed and high cutting force, parts are easy to feed, so that the machining size of the parts is unstable, and even the parts are unqualified. Traditional dabber location is higher to location reference hole precision requirement, is not suitable for blank reference hole as the location, must have the positioning gap, and easy material moves in the course of working, therefore the machining precision of this type of part can't be satisfied in traditional dabber location.

Disclosure of Invention

The invention provides an internal expansion centering fixture, which aims to solve the problems that the existing part using a blank reference hole as a positioning part cannot be accurately positioned and the machining quality is influenced.

The technical scheme is as follows: the inner expansion centering fixture is characterized by comprising a bottom plate supported on a base, wherein a positioning seat mechanism is installed on the bottom plate, a positioning plug, a positioning base plate and an upper pressing block are arranged beside the positioning seat mechanism, the positioning seat mechanism comprises an outer positioning shaft which is fixed and penetrates through the bottom plate, an inner shaft which is coaxially arranged is arranged in the outer positioning shaft, the lower end of the inner shaft is connected with a lifting driving mechanism, at least three key grooves are formed in the outer peripheral surface of the upper end of the outer positioning shaft, inner expansion wedge blocks are clamped in the key grooves, the outer wall of the upper end of the inner shaft is in wedge fit with the inner wall of the inner expansion wedge blocks, the outer wall of the outer positioning shaft is sleeved with an outer positioning ring, the inner expansion wedge blocks abut against the inner wall of the outer positioning shaft, and a cover cap is installed at the top of the outer positioning shaft.

The pressing device is further characterized in that the upper pressing block is sleeved on the pressing screw, the bottom of the pressing screw is in threaded connection with the bottom plate, a through hole with the size smaller than that of a hexagonal head of the pressing screw is formed in the upper pressing block, one end, facing the positioning seat mechanism, of the upper pressing block is a pressing surface, the other end of the upper pressing block is arranged in a limiting groove of the limiting seat, and the upper pressing block is in clearance fit with the limiting groove;

the positioning plug is a spring positioning plug, and the spring positioning plug and the positioning base plate are fixed on the bottom plate through screws;

the lifting driving mechanism comprises a lever seat fixed on the bottom plate, a pressure rod is arranged on the lever seat through a pin shaft, one end of the pressure rod is movably connected with the lower end of the inner shaft, and the other end of the pressure rod is movably connected with an adjusting screw rod;

the middle of one end of the pressing rod is provided with a groove, two sides of the groove are arc heads, an upper convex ring and a lower fixing nut are arranged at the lower end of the inner shaft, the lower end of the inner shaft is clamped into the groove of the pressing rod, the arc heads are located between the upper convex ring and the lower fixing nut, a transverse groove is formed in the other end of the pressing rod, the adjusting screw penetrates through the bottom plate and is in threaded connection with the bottom plate, and a T-shaped head is arranged at the bottom of the adjusting screw and is located in the transverse groove.

After the positioning device is adopted, a blank positioning reference hole on a part is aligned with and sleeved on an outer positioning shaft, the positioning plug, the positioning base plate and the positioning plug play a supporting role, the inner shaft is adjusted to rise, the inner expanding wedge block is pushed out outwards under wedge-shaped matching, so that the outer positioning ring is expanded outwards and tightly attached to the inner wall of the blank positioning reference hole, the expanding and centering effects are realized, the error influence of the size of the blank positioning reference hole is eliminated, and finally, the blank positioning reference hole is tightly pressed and fixed by the upper pressing block, so that the positioning precision and the processing quality are improved.

Drawings

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 isbase:Sub>A sectional view taken along line A-A in FIG. 1;

FIG. 3 is a top view of the structure of the present invention;

fig. 4 is a cross-sectional view taken along line B-B in fig. 3.

Detailed Description

See fig. 1 to 4, an interior bloated centering fixture, it is including supporting in bottom plate 2 of base 1, install positioning seat mechanism 3 on bottom plate 2, the other spring location stopper 4 that is provided with of positioning seat mechanism 3, location backing plate 5 and last briquetting 6, positioning seat mechanism 3 is including fixed and the outer location axle 7 that runs through bottom plate 2, run through being provided with the interior axle 8 of coaxial arrangement in the outer location axle 7, interior axle 8 lower extreme connection lift actuating mechanism, three keyway has been seted up to outer location axle 7 upper end outer peripheral face, be provided with the interior voussoir 9 that expands in the keyway clamps, realize three point chucking, interior axle 8 upper end outer wall and interior voussoir 9 inner wall are the wedge cooperation, outer location axle 7 outer wall cover is equipped with the outer holding ring 10 that the inner expansion voussoir 9 was supported to outer location axle inner wall, the top is installed and is capped 11 to outer location axle 7 top, prevent that outer holding ring 10 from taking off.

Go up briquetting 6 suit in compression screw 12, compression screw 12 bottom and bottom plate 2 threaded connection, go up the through-hole 13 that sets up the hexagonal head that the size is less than compression screw 12 on the briquetting 6, generally select to open waist type hole, conveniently adjust in last briquetting 6, go up briquetting 6 and be the compression surface towards the one end of positioning seat mechanism 3, the other end sets up in the spacing groove 15 of spacing seat 14, it is clearance fit with spacing groove 15 to go up briquetting 6, guarantee that briquetting 6 can only the vertical motion, can't deflect, the reliability of having guaranteed to compress tightly.

The spring positioning plug 4 and the positioning base plate 5 are fixed on the bottom plate 2 through screws, and can be replaced conveniently.

Lifting drive mechanism installs depression bar 18 through round pin axle 17 including being fixed in the lever seat 16 of bottom plate 2 on the lever seat 16, depression bar 18 one end and interior axle 8 lower extreme swing joint, depression bar 18 other end swing joint adjusting screw 19, and concrete structure is as follows: the middle of one end of the pressure lever 18 is provided with a groove, two sides of the groove are both provided with arc heads 20, the lower end of the inner shaft 8 is provided with an upper convex ring 21 and a lower fixing nut 22, the lower end of the inner shaft 8 is clamped into the groove of the pressure lever 18, the arc heads 20 are positioned between the upper convex ring 21 and the lower fixing nut 22, the other end of the pressure lever 18 is provided with a transverse groove 23, the adjusting screw 19 penetrates through the bottom plate 2 and is in threaded connection with the bottom plate 2, the bottom of the adjusting screw 19 is provided with a T-shaped head 24, the T-shaped head 24 is positioned in the transverse groove 23, the size of the transverse groove 23 is larger than that of the T-shaped head 24, a hole in the bottom plate 2, through which the T-shaped head 24 penetrates, is large in size, the adjusting screw 19 can be screwed to lift the adjusting screw 19, due to the cooperation of the T-shaped head 24 and the transverse groove 23, the pressure lever 18 can be lifted along with the pressure lever, the other end of the pressure lever can be lifted along with the other end along with the swinging between the upper convex ring 21 and the lower fixing nut 22, and the circular arc head 20 is not affected, and finally the lifting of the inner shaft 8 can be lifted, when the inner shaft 8, the outer positioning ring 10 can be expanded and is matched with a blank positioning hole on the blank 25 to realize a positioning reference hole.

Claims

1. The inner expansion centering fixture is characterized by comprising a bottom plate supported on a base, wherein a positioning seat mechanism is installed on the bottom plate, a positioning plug, a positioning base plate and an upper pressing block are arranged beside the positioning seat mechanism, the positioning seat mechanism comprises an outer positioning shaft which is fixed and penetrates through the bottom plate, an inner shaft which is coaxially arranged is arranged in the outer positioning shaft in a penetrating manner, the lower end of the inner shaft is connected with a lifting driving mechanism, at least three key grooves are formed in the outer peripheral surface of the upper end of the outer positioning shaft, inner expansion wedge blocks are clamped in the key grooves, the outer wall of the upper end of the inner shaft is in wedge fit with the inner expansion wedge blocks, an outer positioning ring of the inner expansion wedge blocks is sleeved on the outer wall of the outer positioning shaft and props against the inner wall of the outer positioning shaft, a cover cap is installed at the top of the outer positioning shaft, the upper pressing block is sleeved on a pressing screw, the bottom of the pressing screw is in threaded connection with the bottom plate, a through hole which the size is smaller than a hexagon head of the pressing screw is formed in the upper pressing block, one end of the upper pressing block is arranged in a limiting groove of a limiting seat, the upper pressing block, the positioning plug, the upper pressing block is in clearance fit with the limiting groove of the positioning base plate, and the positioning plug are fixed on the bottom plate through screws.

2. The internal expanding centering fixture as claimed in claim 1, wherein the lifting driving mechanism includes a lever seat fixed on the bottom plate, a pressing rod is mounted on the lever seat through a pin, one end of the pressing rod is movably connected with the lower end of the inner shaft, and the other end of the pressing rod is movably connected with an adjusting screw.

3. The internal expanding centering fixture according to claim 2, wherein a groove is formed in the middle of one end of the pressing rod, two sides of the groove are arc heads, an upper convex ring and a lower fixing nut are arranged at the lower end of the inner shaft, the lower end of the inner shaft is clamped into the groove of the pressing rod, the arc heads are located between the upper convex ring and the lower fixing nut, a transverse groove is formed in the other end of the pressing rod, the adjusting screw penetrates through the bottom plate and is in threaded connection with the bottom plate, and a T-shaped head is arranged at the bottom of the adjusting screw and located in the transverse groove.