CN216138114U - Positioning fixture for micro shaft sleeve type parts - Google Patents

Abstract

The utility model provides a positioning clamp for a tiny shaft sleeve part, which comprises an adapter and an elastic chuck, wherein the right end of the adapter is provided with an inner conical hole, the outer side of the right end of the elastic chuck is provided with an outer conical surface matched with the inner conical hole, the outer side of the left end of the elastic chuck is provided with an external thread, the right end of the elastic chuck is provided with a plurality of symmetrically distributed separation grooves, the right end of the elastic chuck is divided into a plurality of elastic blocks with separated petals by the separation grooves, a support frame with a central hole is arranged in the separation grooves, and a gap is reserved between the separation grooves and the support frame. According to the utility model, the elastic chuck is provided with the separation grooves, the support frame for positioning is arranged between the separation grooves, so that the clamping component is separated from the positioning component, the positioning end is invariable relative to the original point of a machine tool all the time, and the axial positioning repetition precision of the part to be processed is ensured; by arranging the symmetrical components and installing the components on the main shaft in an evenly distributed mode, the dynamic balance grade of the main shaft is unchanged, the vibration of the main shaft is prevented, and the machining precision is improved.

Description

Positioning fixture for micro shaft sleeve type parts

Technical Field

The utility model belongs to the technical field of machining, and particularly relates to a positioning clamp for a micro shaft sleeve part.

Background

When a numerically controlled gang tool lathe is used for machining precision microminiature shaft sleeve type parts, the requirement on the machining precision of the axial size of the parts is high, and when the parts are loaded into a main shaft chuck relative to the zero point or the original point position of a program of the machine tool during automatic loading and unloading batch machining, the high repeated positioning precision is also required for the axial clamping of the parts.

The clamp of the tiny shaft sleeve part in the current market is roughly divided into two types: the first is that a slender rod is arranged in a main shaft pull rod and then positioned, and a workpiece is positioned close to the front end surface positioned at the back; the second is that the inner hole of the spring chuck is provided with a pre-processed inner shoulder surface, and the workpiece is positioned by the inner shoulder surface. Both of these approaches have a number of disadvantages. The first method comprises the following steps: because the slender rod is arranged in the pull rod, the dynamic balance is changed when the main shaft rotates at a high speed, the dynamic balance level is degraded, vibration and noise are generated, and further the processing precision is influenced, meanwhile, the slender rod has bending deformation, so that the positioning end surface positioned after generates uncertain axial displacement, and the axial clamping repeated positioning precision of a workpiece is directly influenced; and the second method comprises the following steps: when the collet chuck is pulled by the pull rod to radially shrink and clamp a workpiece, the pre-processed positioning shoulder surface of the collet chuck can change in position degree along with shrinkage and expansion of the collet chuck, and further axial clamping repeated positioning accuracy of the workpiece is directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a positioning clamp for a micro shaft sleeve part aiming at the defects of the prior art. The positioning fixture divides the elastic chuck into symmetrical elastic blocks by arranging the symmetrically distributed separation grooves on the elastic chuck, and fixedly connects all parts in the positioning fixture in an evenly distributed mode, so that the parts can keep the same axial force in the high-speed rotation process, the axial dynamic balance of a main shaft is further kept, the vibration of the main shaft is prevented, and the processing precision of micro shaft sleeve parts is improved; meanwhile, a support frame with a positioning function is arranged in a gap of a separation groove of the elastic chuck, and the positioning component is separated from the clamping component, so that the positioning end face is always unchanged relative to the original point of the machine tool, the repeatability precision of axial positioning of workpieces processed in batches is improved, and the mechanical precision and the qualification rate of processing of the micro shaft sleeve parts are further improved.

In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides a small axle sleeve part positioning fixture, its characterized in that, include the adapter with the cooperation install in collet in the adapter, interior taper hole has been seted up to the right-hand member of adapter, collet's the right-hand member outside be equipped with interior taper hole complex external cone, collet's the left end outside processing has the external screw thread, collet right-hand member has seted up the separating tank of a plurality of symmetric distribution, just separating tank cuts apart collet's the right-hand member corresponding elastic block that separates into a plurality of lamellas each other, it has the support frame to settle in the separating tank, the centre bore of holding part of waiting to process is seted up at the center of support frame, separating tank with it is gapped between the support frame.

Foretell small axle sleeve class part positioning fixture, its characterized in that, install the holding ring on the taper hole excircle in the interior taper hole outside, evenly distributed's a plurality of third connecting hole is seted up to the side of holding ring, the third connecting hole will through cooperating with the second mounting the holding ring install in on the taper hole excircle, a plurality of evenly distributed's end face slot has been seted up to the right-hand member face of holding ring, the second connecting hole has been seted up to the end face slot, the support frame is installed through the third mounting in the second connecting hole.

The positioning fixture for the micro shaft sleeve type part is characterized in that the support frame is composed of a plurality of web strips which are symmetrically distributed, the web strips are arranged in the separation grooves, a gap is reserved between the outer sides of the web strips and the separation grooves, a center hole is formed in the intersection point of the web strips, a reference block is arranged at the tail end of each web strip, a fourth connecting hole is formed in the reference block, and the fourth connecting hole is matched with the third fixing piece to enable the reference block to be installed in the fourth connecting hole.

Foretell small axle sleeve part positioning fixture, its characterized in that, set up the first connecting hole of a plurality of evenly distributed on the adapter, first connecting hole will through cooperating with first mounting the adapter is fixed on the main shaft terminal surface, wherein, the main aspects terminal surface of adapter left end with the laminating of main shaft terminal surface, the main aspects hole of adapter left end and the flange cooperation of main shaft tip.

The positioning fixture for the micro shaft sleeve type parts is characterized in that two symmetrical guide grooves are formed in the outer surface of the left end of the elastic chuck.

Foretell small axle sleeve class part positioning fixture, its characterized in that, the outside of the main aspects excircle of adapter left end is provided with the protective cover, the protective cover passes through the fourth mounting to be fixed on main shaft overcoat terminal surface.

The positioning fixture for the micro shaft sleeve type part is characterized in that the second fixing piece is a jackscrew, and the first fixing piece, the third fixing piece and the fourth fixing piece are screws.

Compared with the prior art, the utility model has the following advantages:

1. according to the utility model, the separation grooves are formed in the elastic chuck, and the support frame for positioning is arranged between the separation grooves, so that the elastic chuck with the clamping function is separated from the support frame with the positioning function, and when automatic feeding and discharging batch processing is carried out, no matter the elastic chuck clamps or loosens a workpiece, the positioning end face is always unchanged relative to the original point of a machine tool, so that higher axial positioning repeated precision is ensured when a micro shaft sleeve part is installed in a main shaft, the mechanical precision of the micro shaft sleeve part processing is effectively improved, and the qualified rate of the workpiece is improved.

2. According to the utility model, the elastic chuck is divided into symmetrical elastic blocks by arranging the symmetrically distributed separation grooves on the elastic chuck, and all parts in the positioning fixture are fixedly connected to the main shaft in an evenly distributed manner, so that the same axial force can be kept in the high-speed rotation process, the axial dynamic balance of the main shaft is further kept, the vibration of the main shaft is prevented, and the processing precision of the micro shaft sleeve type parts is improved.

3. According to the utility model, the guide groove is arranged to be matched with the anti-rotation pin in the main shaft assembly for use, so that the elastic chuck is prevented from relatively rotating in the adapter, the elastic chuck can accurately move along the axis of the adapter, the side wall of the outer conical surface end can be more uniformly expanded or contracted, the part to be processed is more accurately positioned in the axial direction, and the repeated precision of the positioning of the part to be processed is further improved.

4. According to the utility model, the adapter is protected by the protective cover, so that the phenomenon that high-speed cutting scraps generated in the milling process scratch the radial installation reference surface of the adapter and influence the alignment precision of the adapter during repeated installation is avoided, and further the influence on the machining precision of a tiny shaft sleeve part is avoided.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a front view of the positioning jig of the present invention.

Fig. 2 is a schematic view of the back structure of the positioning jig of the present invention.

Fig. 3 is a front view of the positioning jig of the present invention.

Fig. 4 is a cross-sectional view at a-a in fig. 3.

Fig. 5 is a schematic structural view of an adapter in the positioning jig of the present invention.

Fig. 6 is a cross-sectional view at B-B in fig. 5.

Fig. 7 is a schematic structural view of the collet in the positioning jig of the present invention.

Fig. 8 is a schematic structural diagram of a positioning ring in the positioning fixture of the present invention.

Fig. 9 is a schematic structural view of the support frame in the positioning jig of the present invention.

Fig. 10 is a schematic view of the positioning jig of the present invention in a use state.

Description of reference numerals:

1-an adapter;	1-inner taper hole;	1-2-taper hole excircle;
			1-3-big end face;	1-4-large end inner hole;	1-5-a first connection hole;
1-6-big end excircle;	2-elastic collet;	2-1-external conical surface;
			2-elastic block;	2-3-separation tank;	2-4-external threads;
2-5-a guide groove;	3-a positioning ring;	3-1-end face groove;
			3-2 — a second connection hole;	3-third connection hole;	4, supporting frames;
4-1-central hole;	4-2-web panels;	4-3 — a reference block;
			4-fourth connection hole;	5-a protective cover;	6-a first fixing piece;
7-a second fixing member;	8-a third fixing member;	9-a fourth fixing member;
			10, parts to be processed;	11-end surface of the main shaft;	12-a feeding mechanism;
13-a pull rod;	14-anti-rotation pin;	15-a flange;
			16-end surface of the spindle sleeve.

Detailed Description

Example 1

As shown in FIGS. 1 to 7, the positioning fixture for micro shaft sleeve parts of the present embodiment comprises an adapter 1 and an elastic chuck 2 installed in the adapter 1 in a matching manner, an inner taper hole 1-1 is arranged at the right end of the adapter 1, an outer taper surface 2-1 matched with the inner taper hole 1-1 is arranged at the outer side of the right end of the elastic chuck 2, the outer side of the left end of the elastic chuck 2 is provided with external threads 2-4, the right end of the elastic chuck 2 is provided with a plurality of symmetrically distributed separation grooves 2-3, the separating groove 2-3 divides the right end of the elastic chuck 2 into a plurality of mutually separated elastic blocks 2-2, a support frame 4 is arranged in the separation groove 2-3, a central hole 4-1 for accommodating a part 10 to be processed is formed in the center of the support frame 4, and a gap is formed between the separation groove 2-3 and the support frame 4.

In the embodiment, an inner taper hole 1-1 at the right end of an adapter 1 is used for positioning and supporting an elastic chuck 2, the inner taper hole 1-1 is matched with an outer taper surface 2-1 at the right end of the elastic chuck 2 to clamp or loosen a micro shaft sleeve part to be processed, an outer thread 2-4 arranged at the left end of the elastic chuck 2 is used for being connected with a pull rod 13 on a main shaft, after the micro shaft sleeve part to be processed is clamped on the elastic chuck 2, the pull rod 13 on the main shaft moves leftwards under the action of tensioning drive, the elastic chuck 2 moves leftwards along with the pull rod, an elastic part at the right end of the elastic chuck 2 contracts under the action of an inner taper hole 1-1, a workpiece in the elastic chuck 2 is clamped, the pull rod 13 moves rightwards similarly, the elastic chuck 2 moves rightwards along with the pull rod, the elastic part at the right end of the elastic chuck 2 expands under the action of the inner taper hole 1-1, the workpiece in the elastic chuck 2 is loosened; the support frame 4 is arranged between the separation grooves 2-3 of the elastic chuck 2 and plays a role in positioning the clamping of the micro shaft sleeve type part to be processed, and a central hole 4-1 formed in the support frame 4 is used for accommodating and positioning the part 10 to be processed; the right end of the elastic chuck 2 is divided into the separated elastic blocks 2-2 by the separating grooves 2-3, a gap is reserved between the separating grooves 2-3 and the supporting frame 4, the elastic chuck 2 is separated from the supporting frame 4 by the gap, namely, the clamping functional part is separated from the positioning functional part, when the automatic feeding and discharging batch processing is carried out, the position of the supporting frame 4 is fixed, no matter the elastic chuck 2 clamps or loosens the part 10 to be processed, the supporting frame 4 is used as the positioning end of the part 10 to be processed and is invariable relative to the original point of a machine tool or the original point of a program, so that the micro shaft sleeve type part is ensured to have higher axial positioning repeated precision when being installed into a main shaft, the mechanical precision of the micro shaft sleeve type part processing is effectively improved, and the qualified rate of workpieces is improved; the right end of the elastic chuck 2 is provided with a plurality of symmetrically distributed separation grooves 2-3, the elastic chuck 2 is correspondingly divided into a plurality of symmetrically distributed elastic blocks 2-2, and the symmetrical distribution enables the elastic blocks to keep the same axial force in the high-speed rotation process, so that the axial dynamic balance of the main shaft is kept, the vibration of the main shaft is prevented, and the processing precision of workpieces is improved.

As shown in fig. 1 to 8, optionally, in this embodiment, a positioning ring 3 is installed on a taper hole excircle 1-2 outside the inner taper hole 1-1, a plurality of third connecting holes 3-3 are formed in a side surface of the positioning ring 3, the positioning ring 3 is installed on the taper hole excircle 1-2 by the third connecting holes 3-3 matching with a second fixing member 7, a plurality of end surface grooves 3-1 are formed in a right end surface of the positioning ring 3, second connecting holes 3-2 are formed in the end surface grooves 3-1, and the support frame 4 is installed in the second connecting holes 3-2 through the third fixing member 8. The positioning ring 3 is provided with the third connecting holes 3-3 and matched with the second fixing piece 7, so that the positioning ring 3 is installed on the excircle 1-2 of the taper hole, namely the positioning ring 3 is installed on the adapter 1, the positioning ring 3 rotates along with the rotation of the adapter 1, the third connecting holes 3-3 are uniformly distributed on the side surface of the positioning ring 3, the dynamic balance grade of the positioning ring 3 on the adapter 1 is kept unchanged, the vibration of a main shaft is prevented, and the machining precision of a micro shaft sleeve part is improved; the positioning ring 3 is used for mounting the support frame 4, and particularly the support frame 4 is fixedly mounted in a second connecting hole 3-2 in the end surface groove 3-1 through a third fixing piece 8; the end surface grooves 3-1 are also uniformly distributed on the right end surface of the positioning ring 3, and are also uniformly distributed to be beneficial to maintaining the dynamic balance in the rotating process of the main shaft.

As shown in fig. 1 to 9, optionally, in this embodiment, the supporting frame 4 is composed of a plurality of web strips 4-2 symmetrically distributed, the web strips 4-2 are disposed in the separation grooves 2-3, a gap is formed between the outer sides of the web strips 4-2 and the separation grooves 2-3, the center hole 4-1 is formed at the intersection of the web strips 4-2, a reference block 4-3 is disposed at the end of the web strips 4-2, a fourth connecting hole 4-4 is formed in the reference block 4-3, and the fourth connecting hole 4-4 is matched with the third fixing member 8 to mount the reference block 4-3 in the second connecting hole 3-2. The uniformly distributed web strips 4-2 are beneficial to keeping the dynamic balance of the support frame 4 on the main shaft, and a central hole 4-1 formed at the intersection point of the web strips 4-2 is positioned in the center of the support frame 4 and used for positioning a micro shaft sleeve part to be processed; the supporting frame 4 is fixedly arranged on the positioning ring 3 by arranging a fourth connecting hole 4-4 on the reference block 4-3, arranging a second connecting hole 3-2 in the end surface groove 3-1, and matching the fourth connecting hole 4-4 and the second connecting hole 3-2 with the third fixing piece 8; a plurality of symmetrically distributed web strips 4-2 are arranged between the separation grooves 2-3, a gap is arranged between the web strips 4-2 and the separation grooves 2-3, namely, the web plate strip 4-2 and the separation groove 2-3 are in a separated state and are not contacted with each other, the arranged support frame 4 plays a positioning role, the elastic chuck 2 plays a clamping role, the design of the parts with the functions of positioning and clamping the micro shaft sleeve parts to be processed is divided, so that when the elastic chuck 2 clamps or loosens the micro shaft sleeve parts to be processed, the position of the positioning end is invariable relative to the machine tool origin or the program origin of the numerical control machine tool, therefore, the positioning position of the micro shaft sleeve type parts can be repeated when the micro shaft sleeve type parts are installed in the main shaft, so that the positioning accuracy of the micro shaft sleeve type parts produced in batches is improved, and the machining accuracy of the micro shaft sleeve type parts is further improved.

As shown in fig. 6 and 10, optionally, in this embodiment, the adapter 1 is provided with a plurality of first connection holes 1-5 uniformly distributed, and the first connection holes 1-5 are matched with the first fixing member 6 to fix the adapter 1 on the end surface 11 of the spindle, wherein the large end surface 1-3 of the left end of the adapter 1 is attached to the end surface 11 of the spindle, and the large end inner hole 1-4 of the left end of the adapter 1 is matched with the flange 15 of the end portion of the spindle. A plurality of first connecting holes 1-5 which are uniformly distributed are formed in an adapter 1, the adapter 1 is matched with a first fixing piece 6 to be fixedly installed on a main shaft end face 11 of a numerical control machine tool, so that a large end face 1-3 of the adapter 1 is attached to the main shaft end face 11, the first connecting holes 1-5 which are uniformly distributed and the first fixing piece 6 ensure that the dynamic balance grade of the adapter 1 on a main shaft is unchanged, namely the adapter 1 and the main shaft end face 11 are axially fixed through the connection of the first fixing piece 6, a large end inner hole 1-4 is matched with a flange 15 of the main shaft end face to radially position the adapter 1, the stable installation of the adapter 1 ensures that an elastic chuck 2 sleeved in the adapter 1 is axially balanced to prevent the main shaft from vibrating, further ensure that a micro shaft sleeve part to be processed is stably clamped, and the defect that the dynamic balance is changed when the main shaft rotates at a high speed is overcome, further improving the processing precision. In the present embodiment, six first connection holes 1 to 5 are provided, thereby reducing the complexity of manufacturing the jig while ensuring stable installation.

As shown in fig. 7, optionally, in this embodiment, two symmetrical guide grooves 2-5 are formed on the outer surface of the left end of the collet 2. The guide groove 2-5 axially arranged on the outer surface of the left end of the elastic chuck 2 is matched with the anti-rotation pin 14 in the spindle assembly for use, so that the elastic chuck 2 is prevented from rotating relatively in the adapter 1, the elastic chuck 2 can accurately move along the axis of the adapter 1 under the guiding action of the anti-rotation pin 14 matched with the guide groove 2-5, the side wall of the end of the outer conical surface 2-1 can expand or contract more uniformly, the part 10 to be processed is positioned more accurately in the axial direction, and the repeated precision of the positioning of the part to be processed is further improved. In this embodiment, the width of the guide groove 2-5 is 3mm, and the guide groove is matched with the size of the anti-rotation pin 14 on the main shaft, so that the anti-rotation pin 14 is ensured to be clamped in the guide groove 2-5, and the axial guide of the collet 2 is realized.

As shown in fig. 1 to 6, optionally, in this embodiment, a protecting cover 5 is disposed outside the large-end outer circle 1-6 at the left end of the adapter 1, and the protecting cover 5 is fixed on the spindle housing end surface 16 by a fourth fixing member 9. The protective cover 5 is used for protecting the adapter 1, and preventing high-speed cutting chips generated in the milling process from scratching a radial installation reference surface of the adapter 1 and influencing the alignment precision of the adapter 1 during repeated installation, so that the machining precision of a tiny shaft sleeve part is prevented from being influenced; the protective cover 5 is fixed on the end face 16 of the spindle housing by the fourth fixing piece 9, the protective cover 5 does not contact with the adapter 1, namely, does not rotate with the adapter 1, and the adapter 1 and the end face 11 of the mounting spindle are protected from being scratched by high-speed chips.

As shown in fig. 1 to 4, optionally, in this embodiment, the second fixing element 7 is a jackscrew, and the first fixing element 6, the third fixing element 8 and the fourth fixing element 9 are screws. The adapter 1 is fixedly arranged on the end surface 11 of the main shaft by the arranged first fixing piece 6, the support frame 4 is fixedly arranged on the positioning ring 3 by the arranged third fixing piece 8, the positioning ring 3 is radially fixed on the excircle 1-2 of the taper hole of the adapter 1 by the arranged second fixing piece 7, the positioning ring 3 is prevented from axially rotating on the adapter 1 in the milling process, thereby ensuring the positioning accuracy of the support frame 4 arranged on the positioning ring 3, the fourth fixing piece 9 is arranged to fixedly arrange the protective cover 5 on the end surface 16 of the main shaft jacket, the first fixing piece 6, the third fixing piece 8 and the fourth fixing piece 9 play a role in fixing and mounting, screws are selected as mounting fixing pieces to be mounted in connecting holes matched with the mounting fixing pieces, the second fixing piece 7 plays a role in fastening, and jackscrews are selected as fastening fixing pieces to fix the positioning ring 3 on the outer side face of the adapter 1. In this embodiment, the first fastener 6 is an M6X25 socket head cap screw, the second fastener 7 is an M5X10 top cap screw, the third fastener 8 is an M3X8 socket head cap screw, and the fourth fastener 9 is an M5X30 socket head cap screw.

In this embodiment, the number of the separation grooves 2-3 is optionally three, the resilient block 2-2 is three-lobed, the end surface groove 3-1 is three, and the web strip 4-2 is three. This implementation sets up the quantity of dividing groove 2-3, elastic block 2-2, end face slot 3-1 and web strip 4-2 to three, when guaranteeing stability and intensity, saves manufacturing cost more.

It is noted that the number of web strips 4-2 provided should be equal to or less than the number of separation grooves 2-3, the number of end grooves 3-1 provided should be equal to or greater than the number of web strips 4-2, and the number of resilient blocks 2-2 should correspond to the number of separation grooves 2-3.

The mounting, production and use process of the positioning clamp for the micro shaft sleeve parts comprises the following steps: aligning an inner hole 1-4 at the large end of an adapter 1 with a flange 15 at the end face of a main shaft, installing the inner hole on the large end of the adapter 1 on the end face 11 of the main shaft through a first fixing piece 6, aligning a guide groove 2-5 of an elastic chuck 2 with an anti-rotation pin 14 on the main shaft, installing the anti-rotation pin into the adapter 1, rotating a pull rod 13 on the main shaft to be connected with an external thread 2-4, sleeving a positioning ring 3 on an excircle 1-2 of a taper hole, fixedly installing the positioning ring 3 by using a second fixing piece 7, fixing a support frame 4 in an end face groove 3-1 of the positioning ring 3 through a third fixing piece 8, finally fixing a protective cover 5 on an end face 16 of a main shaft sleeve through a fourth fixing piece 9, completing installation of a positioning clamp, feeding a part 10 to be processed into the elastic chuck 2 by a feeding mechanism 12, positioning the part 10 to be processed by combining the feeding mechanism 12 with the support frame 4, and then moving the pull rod 13 to the left under the driving of clamping power, the right end of the elastic chuck 2 contracts, the part 10 to be processed is clamped, and the part 10 to be processed is ready to be milled.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (9)

1. The positioning clamp for the micro shaft sleeve type part is characterized by comprising an adapter (1) and an elastic chuck (2) installed in the adapter (1) in a matched mode, wherein an inner taper hole (1-1) is formed in the right end of the adapter (1), an outer conical surface (2-1) matched with the inner taper hole (1-1) is arranged on the outer side of the right end of the elastic chuck (2), external threads (2-4) are machined on the outer side of the left end of the elastic chuck (2), a plurality of symmetrically-distributed separation grooves (2-3) are formed in the right end of the elastic chuck (2), the right end of the elastic chuck (2) is correspondingly divided into a plurality of mutually-separated elastic blocks (2-2), a support frame (4) is arranged in each separation groove (2-3), and a center hole (4-1) for containing the part (10) to be machined is formed in the center of the support frame (4) ) And a gap is reserved between the separation groove (2-3) and the support frame (4).

2. The positioning fixture for the tiny shaft sleeve type part according to claim 1, wherein a positioning ring (3) is installed on the outer circle (1-2) of the taper hole outside the inner taper hole (1-1), the side surface of the positioning ring (3) is provided with a plurality of third connecting holes (3-3) which are uniformly distributed, the third connecting hole (3-3) is matched with the second fixing piece (7) to install the positioning ring (3) on the excircle (1-2) of the taper hole, the right end face of the positioning ring (3) is provided with a plurality of end face grooves (3-1) which are uniformly distributed, a second connecting hole (3-2) is formed in the end face groove (3-1), and the support frame (4) is installed in the second connecting hole (3-2) through a third fixing piece (8).

3. The positioning fixture for the tiny shaft sleeve type part according to claim 2, characterized in that the supporting frame (4) is composed of a plurality of web strips (4-2) which are symmetrically distributed, the web strips (4-2) are arranged in the separation grooves (2-3), a gap is reserved between the outer side of the web lath (4-2) and the separation groove (2-3), a center hole (4-1) is arranged at the intersection point of the web lath (4-2), the tail end of the web lath (4-2) is provided with a reference block (4-3), the reference block (4-3) is provided with a fourth connecting hole (4-4), the fourth connecting hole (4-4) is matched with the third fixing piece (8) to install the reference block (4-3) in the fourth connecting hole (4-4).

4. The positioning fixture for the tiny shaft sleeve type part according to claim 1, wherein a plurality of first connecting holes (1-5) are uniformly distributed on the adapter (1), the first connecting holes (1-5) are matched with a first fixing member (6) to fix the adapter (1) on a main shaft end surface (11), wherein a large end surface (1-3) of the left end of the adapter (1) is attached to the main shaft end surface (11), and a large end inner hole (1-4) of the left end of the adapter (1) is matched with a flange (15) of the main shaft end.

5. The positioning fixture for the micro shaft sleeve type part as claimed in claim 1, wherein the outer surface of the left end of the elastic chuck (2) is provided with two symmetrical guide grooves (2-5).

6. The positioning fixture for the tiny shaft sleeve type part as claimed in claim 1, wherein a protecting cover (5) is disposed outside the large end outer circle (1-6) at the left end of the adapter (1), and the protecting cover (5) is fixed on the end face (16) of the spindle sleeve through a fourth fixing member (9).

7. The positioning fixture for the tiny shaft sleeve type part as claimed in claim 2, wherein the second fixing member (7) is a jackscrew, and the third fixing member (8) is a screw.

8. The positioning fixture for the tiny shaft sleeve type part as claimed in claim 4, wherein the first fixing member (6) is a screw.

9. The positioning fixture for the tiny shaft sleeve type part as claimed in claim 6, wherein the fourth fixing member (9) is a screw.

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