CN212240685U

CN212240685U - Multipoint positioning fixture

Info

Publication number: CN212240685U
Application number: CN202020414514.2U
Authority: CN
Inventors: 李嘉
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-12-29
Anticipated expiration: 2030-03-26

Abstract

The utility model relates to the technical field of clamps, in particular to a multipoint positioning clamp, which comprises a clamp body, positioning parts and a clamping assembly, wherein the arc-shaped positioning surface of the clamp body is provided with a plurality of positioning parts which are arranged at intervals around the inner wall of the clamp body; and a clamping assembly having a clamping state in which the clamping assembly moves toward the die casting outer wall surface, abuts against the die casting outer wall surface, and applies a clamping force toward the die casting inner wall surface, and a release state in which the clamping assembly is away from the die casting outer wall surface so as not to apply the clamping force to the die casting outer wall surface. The multi-fixed-point clamp with the structure supports and positions the die casting through the plurality of positioning parts and the arc positioning surfaces, the clamping assembly only needs to abut against the outer wall surface of the die casting to apply clamping force with proper size so as not to damage the outer wall surface of the die casting or deform the die casting, the die casting after reprocessing or finish machining can reach the preset requirement, the appearance is lossless, and the product quality standard is met.

Description

Multipoint positioning fixture

Technical Field

The utility model belongs to the technical field of anchor clamps, concretely relates to multiple spot positioning fixture.

Background

The fixture is used for fixing and processing the die casting in a correct position in a mechanical manufacturing process so as to receive processing or detection.

In a broad sense, any process in the process flow, the apparatus used to quickly, easily and safely install die castings, may be referred to as a jig. The clamp is generally composed of a positioning element, a clamping device, a tool setting guide element, an indexing device, a connecting element, a clamp body and the like.

The die casting needs to be reprocessed or finely processed after being demoulded, a clamp is usually needed to fix the die casting when the die casting is reprocessed or finely processed, and when the die casting is clamped and positioned in a special-shaped die casting with an arc-shaped surface and the like on the surface, the traditional clamp is difficult to accurately position the die casting, the die casting cannot be clamped and fixed or cannot be clamped and fixed unstably, the die casting is deviated when being reprocessed or finely processed due to unstable clamping and fixing, the positioning is not accurate, and the reprocessing or the finely processing of the die casting is influenced; the existing common method is that the die casting is positioned and fixed by increasing the clamping force of the clamping device, and the clamping force is too large due to the thinning of the wall thickness of the die casting, so that the die casting is deformed to cause the problem that the size and the thickness of a die casting finished product do not accord with the quality standard or even the surface of the die casting is damaged, and further the quality of the die casting is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that solve lies in overcoming traditional anchor clamps among the prior art and carrying out the clamping to special-shaped part and reprocessing or smart man-hour, the mode that adopts the clamp force that increases clamping device fixes a position the die casting, can't guarantee die casting off-the-shelf size thickness etc. influences the quality of die casting.

Therefore, the utility model provides a multiple spot positioning fixture, include:

the fixture comprises a fixture body, a positioning part and a positioning part, wherein the fixture body is provided with an opening and an arc-shaped positioning surface which is downwards recessed from the opening and is matched with the appearance of a die casting;

and a clamping assembly having a clamping state of moving toward the outer wall surface of the die cast, abutting against the outer wall surface of the die cast and applying a clamping force toward the inner wall surface of the die cast, and a releasing state of moving away from the outer wall surface of the die cast to release the outer wall surface of the die cast and not applying the clamping force thereto.

Optionally, the multi-point positioning fixture, the clamping assembly includes:

a clamping member provided at an angle to a tangential direction of an outer wall surface of the die casting, and having an abutting portion abutting against the outer wall surface of the die casting in the clamped state;

a drive member having a drive shaft connected to the clamp member, the drive shaft driving the clamp member to move toward the die-cast outer wall surface in the clamped state so that the abutting portion abuts against the die-cast outer wall surface and applying the clamping force thereto; and moving away from the die cast outer wall surface in the released state so as not to apply the clamping force to the die cast outer wall surface.

Optionally, in the multi-point positioning fixture, the driving part is an air cylinder, a driving shaft of the air cylinder can vertically extend and retract, and the clamping part is hinged to the driving shaft; the clamping assembly further comprises:

the limiting component is arranged in parallel with the driving shaft, one end of the limiting component is hinged and fixed on the driving component, and the other end of the limiting component is hinged with the clamping component;

the clamping component rotates around a hinge point with the limiting component to move towards or away from the die-casting outer wall surface; the vertical height of the limiting component is higher than that of the driving shaft at least in the releasing state.

Optionally, in the multi-point positioning fixture, the clamping component is in a shape of a strip and has a first end hinged to the driving shaft;

a second end opposite to the first end and hinged with the limiting component, wherein a protruding part protruding towards the outer wall surface of the die casting is formed at the second end, and the protruding part is the abutting part; and

and the yielding groove is formed between the first end and the second end and is sunken upwards.

Optionally, the multipoint positioning fixture comprises two clamping assemblies, the two clamping assemblies are oppositely arranged on two sides of the fixture body in the diameter direction, and an avoidance gap is formed in the position, corresponding to the clamping assemblies, of the fixture body;

in the clamping state, the abutting portion passes through the avoiding gap and moves towards the outer wall surface of the die casting, abuts against the outer surface of the die casting and applies the clamping force to the outer surface of the die casting.

Optionally, in the multi-point positioning fixture, abdicating notches are further formed in two sides of the fixture body in the diameter direction, and a support component protruding upwards and used for supporting the bottom of the outer edge of the die casting is arranged in any abdicating notch;

the diameter direction of the two abdicating notches is perpendicular to the diameter direction of the two abdicating notches.

Optionally, the multi-point positioning fixture, the positioning component includes:

the supporting pin can be vertically and telescopically arranged in an installation hole formed in the clamp body; and

and the biasing member is arranged in the mounting hole, one end of the biasing member abuts against the bottom wall of the mounting hole, and the other end of the biasing member abuts against the bottom end of the supporting pin and applies biasing force to the supporting pin towards the outer side of the mounting hole.

Optionally, the positioning components of the multi-point positioning fixture include four positioning components, and the four positioning components are uniformly arranged at intervals along a circle of the inner wall of the fixture body where the opening is located;

the die casting is provided with matched positioning holes corresponding to the positioning parts, and the four positioning parts are inserted into the positioning holes in a one-to-one correspondence manner; and/or

The biasing member is a spring.

Optionally, the multi-point positioning fixture, the arc locating surface be the sphere, still including setting up the jacking part that can vertically stretch out and draw back in the anchor clamps body bottom outside correspond on the arc locating surface a intercommunication the hole of stepping down of anchor clamps body has been seted up to the jacking part position, jacking part inserts and locates in the hole of stepping down.

Optionally, the multi-point positioning fixture further comprises a base, and the fixture body, the clamping assembly and the jacking part are all arranged on the base.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a multiple spot positioning fixture, include:

the die casting fixture comprises a fixture body, positioning parts and a clamping assembly, wherein an arc-shaped positioning surface matched with the appearance of a die casting is arranged in the fixture body, and the positioning parts are arranged at intervals around the inner wall of the fixture body; and a clamping assembly having a clamping state in which the clamping assembly moves toward the die casting outer wall surface, abuts against the die casting outer wall surface, and applies a clamping force toward the die casting inner wall surface, and a release state in which the clamping assembly moves away from the die casting outer wall surface to apply no clamping force to the die casting outer wall surface.

The multi-point fixture with the structure supports and positions the die casting through the plurality of positioning parts and the arc-shaped positioning surface, the clamping assembly only needs to abut against the outer wall surface of the die casting to apply clamping force with proper size so as not to damage the outer wall surface of the die casting or deform the die casting, the die casting after reprocessing or finish machining can reach the preset requirement, the appearance is lossless, and the product quality standard is met.

2. The utility model provides a multipoint positioning clamp, the driving part is a cylinder, a driving shaft of the driving part can vertically extend and retract, and the clamping part is hinged with the driving shaft; the clamping assembly further comprises:

the clamping component rotates around a hinge point with the driving shaft and a hinge point with the limiting component to move towards the outer wall surface of the die casting or away from the outer wall surface of the die casting; the vertical height of the limiting component is higher than that of the driving shaft at least in the releasing state. Adopt lever principle, drive clamping part around rotating with spacing part's pin joint through drive component's drive shaft vertical motion realizes putting the clamp of die casting, simple structure, and is more laborsaving.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a multi-point positioning fixture and a die casting in an embodiment of the present invention;

fig. 2 is a schematic top view of the multi-point positioning fixture in the embodiment of the present invention;

fig. 3 is a schematic bottom view of the multi-point positioning fixture according to the embodiment of the present invention;

fig. 4 is a schematic top view of a fixture body in the multi-point positioning fixture in the embodiment of the present invention;

fig. 5 is a schematic structural view of a clamping assembly according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of the clamping member of the clamping assembly of FIG. 5;

fig. 7 is a schematic partial structural view of a positioning member in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a jacking component in an embodiment of the present invention;

fig. 9 is a schematic structural view of a support member in an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a base in an embodiment of the present invention;

fig. 11 is a schematic view of the die cast part of fig. 1.

Description of reference numerals:

1-a clamp body; 11-opening; 12-arc positioning surface; 13-avoiding the gap; 14-abdication gap; 15-mounting holes; 16-a relief hole;

2-a clamping assembly; 21-a clamping member; 211-a first end; 212-a second end; 213-an abutment; 214-a yield slot; 215-hinge hole; 22-a drive member; 23-a stop member; 24-a drive shaft;

3-a positioning member; 31-a support pin;

4-jacking parts; 41-jacking blocks; 42-fixed block; 43-screw rod;

5-a support member; 51-a support block; 52-positioning columns; 53-a resilient member;

6-a base; 61-a first via; 62-a second via;

7-die casting; 71-a first positioning portion; 72-a second location portion; 73-third positioning portion.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

The multi-point positioning fixture of the embodiment, as shown in fig. 1 to 11, includes a fixture body 1, a clamping assembly 2, a positioning component 3, a jacking component 4 and a base 6, wherein the fixture body 1 is a hemispherical structure matching the external shape of a die casting 7, and has a circular opening 11 and an arc-shaped positioning surface 12 recessed downwards from the circular opening 11, that is, the fixture body is formed with a hemispherical inner cavity, the inner wall surface is a spherical surface, the arc-shaped positioning surface 12 is used for supporting and positioning the die casting 7, in this embodiment, the die casting 7 is a hemispherical camera housing; the clamping assembly 2 is arranged outside the clamp body 1, and has a clamping state of moving towards the outer wall surface of the die casting 7, abutting against the outer wall surface of the die casting 7 and applying a clamping force towards the inner wall surface of the die casting 7, and a releasing state of moving away from the outer wall surface of the die casting 7 to release the outer wall surface of the die casting 7 and not applying the clamping force; the positioning components 3 are arranged at intervals around the inner wall of the clamp body 1 where the circular opening 11 is located, namely the positioning components 3 are arranged on the inner wall of the clamp body 1 and close to the opening 11 and are used for supporting and positioning the die casting 7; the jacking component 4 is suitable for moving upwards to lift out the die casting 7 on the arc-shaped positioning surface or serving as a punch to punch the die casting 7; the clamping assembly 2, the positioning component 3, the jacking component 4 and the clamp body 1 are all fixed on the base.

According to the multi-point fixture with the structure, the plurality of positioning components 3 are arranged around the inner wall of the fixture body 1 where the opening 11 is located, the die casting 7 is supported and positioned through the plurality of positioning components 3 and the arc-shaped positioning surface 12, in the using process, the positioning points which are processed in advance on the die casting 7 are aligned with the positioning components 3 to realize positioning, the die casting 7 is placed on the arc-shaped positioning surface 12, clamping force is applied to the die casting 7 through the clamping assembly 2, the die casting 7 is positioned and fixed by the fixture, and then the die casting 7 is reprocessed or finely processed; because the die casting 7 is positioned and fixed by the positioning part 3 and the arc-shaped positioning surface 12 at the same time, the die casting is positioned by a plurality of positioning points, the clamping assembly 2 only needs to be abutted against the outer wall surface of the die casting 7 to apply clamping force with proper magnitude so as not to damage the outer wall surface of the die casting 7 or deform the die casting 7, the die casting can be determined through tests, the die casting 7 after reprocessing or finish machining can reach the preset requirement, the appearance is lossless, and the die casting meets the product quality standard.

As for the clamping assembly 2, as shown in fig. 5, the clamping assembly comprises a clamping part 21, a driving part 22 and a limiting part 23, the driving part 22 is a cylinder, and a driving shaft 24 can vertically move in a telescopic manner; the clamping member 21 is disposed at an angle to the tangential direction of the outer wall surface of the die cast 7, and in the present embodiment, the abutment point of the clamping member 21 with the die cast 7 in the clamped state, that is, the tangential direction of the second positioning portion 72 shown in fig. 11, is 90 °; one end of the clamping part 21 is hinged with a driving shaft 24 of the driving part 22, and the other end is hinged with a limiting part 23; the limiting component 23 and the driving shaft 24 of the driving component 22 are vertically arranged in parallel at intervals, one end of the limiting component 23 is fixedly connected with the outer wall surface of the driving component 22 through a screw (not shown), and the other end of the limiting component 23 is hinged with the clamping component 21; in the release state, the vertical height of the limiting component 23 is higher than that of the driving shaft 24 of the driving component 22, so that the clamping component 21 is obliquely arranged; when the driving shaft 24 of the driving member 22 moves upward, the first end 211 of the clamping member 21, i.e. the left end as shown in fig. 5 and 6, is pushed upward, and since the second end 212 of the clamping member 21, i.e. the right end as shown in fig. 5 and 6, is hinged to the limiting member 23, the end of the clamping member 21 hinged to the limiting member tilts downward around the hinge with the limiting member 23 and moves close to the outer wall surface of the die casting 7 until abutting against the outer wall surface of the die casting 7, and continues to move upward, and the downward tilting rotation of the clamping member 21 continues to apply a clamping force to the outer wall surface of the die casting 7 in the direction of the inner wall surface of the die casting 7, so that the clamping member 21 firmly clamps and fixes the die casting 7 on the arc-shaped positioning surface 12 of the clamp body 1. As an alternative embodiment, the driving shaft 24 of the driving member 22 of the present embodiment may be horizontally extended and contracted, and the clamping member 21 is driven by the horizontally extended and contracted driving shaft 24 to move the clamping member 21 horizontally toward the outer wall surface of the die cast 7 or horizontally away from the outer wall surface of the die cast 7, in which case, the abutting portion 213 of the clamping member 21 abutting against the outer wall surface of the die cast 7 is set to a shape matching the outer wall surface of the die cast 7, such as an arc shape; the clamping and positioning of the die casting 7 can be realized, and the specific structure is not described and limited in detail; the limiting component 23 may or may not be provided, and depending on actual requirements, the limiting component 23 is preferably provided, and the movement stroke of the clamping component 21 can be limited so as to control the clamping force on the outer wall surface of the die casting 7. The vertical height of the driving shaft 24 of the driving member 22 in the clamping state is not limited, and may be still lower than the limiting member 23, or may be even or higher than the limiting member 23, as the case may be, as long as the clamping member 21 can be ensured to abut against the outer wall surface of the die casting 7 in the clamping state and apply an appropriate clamping force to the outer wall surface of the die casting 7 in the direction toward the inner wall surface of the die casting 7, which is not described and limited in detail. The die casting 7 is clamped and released by driving the clamping component 21 to move towards or away from the outer wall surface of the die casting 7 by utilizing the principle of a lever, the structure is simple, labor is saved, and the clamping force applied to the outer wall surface of the die casting 7 by the clamping component 21 in a clamping state can be effectively controlled. Alternatively, in the clamped state, the abutment point of the clamping member 21 with the over-clamping member 21 with the outer wall surface of the die cast 7, i.e., the tangential direction of the position of the second positioning portion 72 as shown in fig. 11, is set at 90 °, and in the released state, the abutment point of the over-clamping member 21 with the outer wall surface of the die cast 7 is set at less than 90 °, which is not particularly limited and described in detail.

As for the clamping component 21, as shown in fig. 6, the clamping component 21 is in a shape of a slab, and includes a clamping body, the clamping body has a first end 211, a second end 212, and a relief groove 214 located between the first end 211 and the second end 212, the first end 211 is hinged to the driving shaft 24 of the driving component 22, and the end portion is in a shape of a circular arc, so as to facilitate the first end 211 of the clamping component 21 to rotate around the driving shaft 24 of the driving component 22; the second end 212 is also in an arc shape, the first end 211 and the second end 212 are oppositely arranged, the end part, namely the right end shown in fig. 6, of the second end 212 is provided with a convex part which is convex towards the outer wall surface of the die casting 7, namely the convex part which is convex outwards and extends away from the first end 211, and the convex part is also an abutting part 213, when in a clamping state, the abutting part 213 is driven by the driving part 22 to rotate downwards and move towards the outer wall surface of the die casting 7 to abut against the outer wall surface of the die casting 7 and apply clamping force to the outer wall surface of the die casting 7 along with the continuous upward movement of the driving part 22 so as to firmly position the arc-shaped outer wall surface of the die casting 7 on the arc-shaped positioning surface 12 of the clamp body 1 and firmly position the top outer edge of the die casting 7 at the top; the first end 211 and the second end 212 are respectively provided with a circular hinge hole 215, and are respectively hinged with the driving shaft 24 of the driving part 22 and the limiting part 23 through hinge shafts (not shown); an abdicating groove 214 which is concave upwards is arranged between the first end 211 and the second end 212 of the clamping component 21, the cross section of the abdicating groove 214 is approximately triangular, the wall surface is arc-shaped, and the abdicating groove 214 is arranged to provide an abdicating space in the rotating process when the driving clamping component 21 rotates around a hinge point with the limiting component 23 when the driving shaft 24 of the driving component 22 does vertical telescopic motion, so as to avoid interference between the rotation of the clamping component 21 and the limiting component 23.

The number of the clamping assemblies 2 can be two or more, for example, four, six, etc., and the embodiment is preferably two, the two clamping assemblies 2 are symmetrically arranged along two sides of the clamp body 1 in the diameter direction, the clamp body 1 is provided with an avoiding gap 13 at a position corresponding to the clamping assembly 2, the abutting part 213 of the clamping member 21 is arranged in the avoiding gap 13 in a penetrating manner, and in the clamping state, the abutting part 213 of the clamping member 21 penetrates through the avoiding gap 13 and moves towards the outer wall surface of the die casting 7 until abutting against the outer wall surface of the die casting 7, and applies a clamping force towards the inner wall surface of the die casting 7 to the outer wall surface of the die casting 7.

Optionally, in order to further support and position the die casting 7, two yielding notches 14 are formed in two sides of the fixture body 1 in the other diameter direction, the yielding notches 14 penetrate through the upper edge of the circular opening 11 of the fixture body 1 and extend downward, a support member 5 is arranged at a position corresponding to the yielding notches 14, the support member 5 comprises a square support block 51 protruding upward, a positioning column 52 and an elastic member 53, the square support block 51 is fixedly mounted on the base 6 through the positioning column 52 and the elastic member 53 sleeved at the outer end of the positioning column 52, and the bottom end of the elastic member 53 abuts against the base 6; the bottom of the outer edge of the die casting 7, i.e., the third positioning portion 73 shown in fig. 11, is supported and fixed on the square support block 51 so that the top end face of the square support block 51 is flush with the end face of the opening 11 of the jig body 1 for further supporting and positioning the die casting 7. Preferably, the diameter direction of the two abdicating notches 14 is perpendicular to the diameter direction of the two abdicating notches 13, as shown in fig. 4, the diameter direction of the two abdicating notches 13 is the left-right direction, and the diameter direction of the two abdicating notches 14 is the front-back direction.

As for the positioning member 3, the positioning member 3 includes a support pin 31 and a biasing member (not shown), as shown in fig. 7, the support pin 31 is a tapered rod-shaped structure and is inserted and fixed in a mounting hole 15 formed along a circumference of an inner wall of the jig body 1, a bottom end of the support pin 31 is in abutting connection with the biasing member, a bottom end of the biasing member abuts on a bottom wall of the mounting hole 15 or the base 6, and a biasing force toward an outside of the mounting hole 15 is applied to the support pin 31. Alternatively, the positioning member 3 of the present invention may be provided with no biasing member, and only the support pin 31 is provided, the support pin 31 is disposed in the mounting hole 15 by means of screw connection and the bottom end thereof is connected with the base 6.

For the jacking component 4, a square abdicating hole 16 is formed in the arc-shaped positioning surface 12, the jacking component 4 is arranged at the bottom of the abdicating hole 16, optionally, the jacking component 4 of the embodiment comprises a jacking block 41 and a fixing block 42, the fixing block 42 is fixedly installed at the bottom end of the base 6, the jacking block 41 is inserted into the abdicating hole 16 after being in interference fit with the fixing block 42 through a screw 43, the jacking block 41 is driven to lift up and down or the screw 43 is in threaded connection with the fixing block 42 by moving the screw 43 up and down, and the jacking block 41 is driven to lift up and down by rotating the screw 43; when the die casting 7 on the arc-shaped positioning surface 12 of the clamp body 1 needs to be ejected after the required procedures are finished, the hand operation screw 43 drives the jacking block 41 to move upwards to jack up the die casting 7; the position of the abdicating hole 16 is avoided from the positions of the abdicating notch 13 and the abdicating notch 14, and the specific position is determined according to the actual requirement and is not described and limited in detail. Alternatively, the jacking component 4 comprises a jacking cylinder (not shown) and a jacking block 41, the jacking block 41 is arranged on an output shaft (not shown) of the jacking cylinder and then inserted into the abdicating hole 16, and the jacking block 41 is lifted up and down by the vertical extension and contraction of a driving shaft of the jacking cylinder. The utility model discloses a jacking part 4 can also regard as the drift to use for punch a hole to die casting 7.

For the anchor clamps body 1, the appearance is the square column shape, and inside has the installation cavity (not shown) of hemisphere shape, and opening 11 sets up at the installation cavity top, and arc locating surface 12 is formed at the diapire of installation cavity, and the breach 14 symmetrical arrangement that steps down is in the both sides of a diameter of anchor clamps body 1, and the both sides of another diameter of anchor clamps body 1 are seted up to the breach 13 symmetry of dodging, and the diameter that the breach 14 that steps down is located and the diameter mutually perpendicular that the breach 13 was located of dodging. Alternatively, the diameter of the abdicating notch 14 and the diameter of the avoiding notch 13 may not be perpendicular, such as 60 ° or 120 °, and preferably perpendicular, i.e. 90 °.

As for the base 6, as shown in fig. 10, the base 6 has a square plate shape, and the jig body 1, the clamping assembly 2, the raising member 4, and the support member 5 are all provided on the base 6. Specifically, a first through hole 61 is formed in the base 6 at a position corresponding to the clamping assembly 2, the first through hole 61 is in a waist shape, the driving shaft 24 and the limiting part 23 of the driving part 22 extend upwards out of the first through hole 61 and extend upwards, and the driving part 22 is fixedly arranged on the base 6 through a fastener such as a screw and is located at the bottom of the first through hole 61; the base 6 is equipped with the second through-hole 62 corresponding to jacking part 4 position, and second through-hole 62 is square form, and jacking piece 41 upwards stretches out second through-hole 62 and inserts in the hole of stepping down 16.

For the die casting 7, as shown in fig. 11, the die casting is a hemispherical camera housing, the top of the camera housing is provided with an outer edge extending outward in the radial direction, the bottom of the outer edge is provided with a first positioning portion 71 corresponding to the position of the positioning component 3 of the fixture body 1, and the first positioning portion 71 is a positioning hole; a second positioning portion 72 is provided at a position corresponding to the abutting portion 213 of the clamping member 21 of the clamping unit 2; a third positioning portion 73 is provided at a position corresponding to the support member 5 of the jig body 1, and the third positioning portion 73 is a flange formed on the outer edge of the top of the die cast 7.

Optionally, the fixture of the utility model is also suitable for the positioning and clamping during reprocessing or finish machining of other irregular die castings with radian. Simultaneously the utility model discloses an anchor clamps are except that reprocessing or the finish machining that is used for the arcwall face die casting tight location of clamp, can also be used for blank die-casting to become the lower bolster that the outer wall personally submits curved die casting, only need add on anchor clamps body 1 top a spherical pressure head can, clamping component 2 at this moment is suitable for the part that punches a hole that need set up through-hole or recess as die casting 7's outer wall and uses, the butt portion 213 of clamping component 21 of clamping component 2 of course can be changed according to the size and the shape that punch a hole.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A multipoint positioning fixture, comprising:

the fixture comprises a fixture body (1) and a plurality of positioning components (3), wherein the fixture body (1) is provided with an opening (11) and an arc-shaped positioning surface (12) which is downwards recessed from the opening (11) and is matched with the appearance of a die casting (7), and the positioning components (3) are arranged around the inner wall of the fixture body (1) where the opening (11) is located at intervals;

a clamping assembly (2) having a clamping state of moving toward the outer wall surface of the die casting (7), abutting against the outer wall surface of the die casting (7) and applying a clamping force toward the inner wall surface of the die casting (7), and a releasing state of moving away from the outer wall surface of the die casting (7) to release the outer wall surface of the die casting (7) and not applying the clamping force thereto.

2. Multipoint positioning fixture according to claim 1, characterized in that said clamping assembly (2) comprises:

a clamp member (21) provided at an angle to a tangential direction of an outer wall surface of the die casting (7), and having a contact portion (213) that contacts the outer wall surface of the die casting (7) in the clamped state;

a drive member (22) having a drive shaft (24) connected to the clamping member (21) and configured to drive the clamping member (21) to move toward the die cast (7) outer wall surface in the clamped state so that the abutment portion (213) abuts against the die cast (7) outer wall surface and apply the clamping force thereto; and moves away from the die-cast piece (7) outer wall surface in the released state so as not to apply the clamping force to the die-cast piece (7) outer wall surface.

3. Multipoint positioning fixture according to claim 2, characterized in that said driving member (22) is a pneumatic cylinder, the driving shaft (24) of which is vertically telescopically movable, said clamping member (21) being hingedly connected to said driving shaft (24); the clamping assembly (2) further comprises:

the limiting component (23) is arranged in parallel with the driving shaft (24), one end of the limiting component is hinged and fixed on the driving component (22), and the other end of the limiting component is hinged with the clamping component (21);

the clamping part (21) rotates around a hinge point with the limiting part (23) to move towards the outer wall surface of the die casting (7) or away from the outer wall surface of the die casting (7); the vertical height of the limiting part (23) is higher than that of the driving shaft (24) at least in the releasing state.

4. A multipoint positioning fixture according to claim 3, wherein said clamping member (21) is in the form of a lath having a first end (211) hingedly connected to said drive shaft (24);

a second end (212) which is opposite to the first end (211) and is hinged with the limiting component (23), wherein a convex part which is convex towards the outer wall surface of the die casting (7) is formed at the second end (212), and the convex part is the abutting part (213); and

an upwardly concave relief groove (214) opening between the first end (211) and the second end (212).

5. The multipoint positioning clamp according to any one of claims 2 to 4, wherein the number of the clamping assemblies (2) is two, the two clamping assemblies (2) are oppositely arranged on two sides of the clamp body (1) in the diameter direction, and the clamp body (1) is provided with an avoiding gap (13) at a position corresponding to the clamping assemblies (2);

in the clamping state, the abutting part (213) passes through the avoiding gap (13) and moves towards the outer wall surface of the die casting (7), and abuts against the outer surface of the die casting (7) and applies the clamping force to the outer surface of the die casting.

6. The multipoint positioning clamp according to claim 5, characterized in that abdicating notches (14) are further formed in two sides of the clamp body (1) in the diameter direction, and a support component (5) which protrudes upwards and is used for supporting the bottom of the outer edge of the die casting is arranged in any abdicating notch (14);

the diameter direction of the two abdicating notches (14) is perpendicular to the diameter direction of the two dodging notches (13).

7. Multipoint positioning fixture according to claim 1, characterized in that said positioning means (3) comprise:

the supporting pin (31) can be vertically arranged in an installation hole (15) formed in the clamp body (1) in a telescopic mode; and

and a biasing member which is arranged in the mounting hole (15), one end of which abuts against the bottom wall of the mounting hole (15), and the other end of which abuts against the bottom end of the supporting pin (31) and applies a biasing force to the supporting pin (31) towards the outside of the mounting hole (15).

8. The multipoint positioning fixture as claimed in claim 7, wherein the number of the positioning components (3) is four, and the four positioning components (3) are uniformly arranged at intervals along a circle of the inner wall of the fixture body (1) where the opening (11) is located;

the die casting (7) is provided with matched positioning holes corresponding to the positioning components (3), and the four positioning components (3) are inserted into the positioning holes in a one-to-one corresponding manner; and/or

The biasing member is a spring.

9. The multipoint positioning fixture according to claim 1, wherein the arc-shaped positioning surface (12) is a spherical surface, and further comprises a vertically telescopic jacking component (4) arranged outside the bottom end of the fixture body (1), a yielding hole (16) penetrating through the fixture body (1) is formed in the arc-shaped positioning surface (12) corresponding to the position of the jacking component (4), and the jacking component (4) is inserted into the yielding hole (16).

10. The multipoint positioning fixture according to claim 9, further comprising a base (6), wherein said fixture body (1), clamping assembly (2) and said jacking member (4) are all disposed on said base (6).