CN210435426U - Jig fixture - Google Patents

Abstract

The utility model discloses a jig anchor clamps, include: the base, the rotatable dabber that is equipped with the axis direction for predetermineeing inclination on the base, the spindle is connected with the indexing mechanism who is used for adjusting dabber turned angle, is connected with positioner on the spindle, and positioner is used for the up end and the lower terminal surface of centre gripping holding ring to drive the holding ring along with the coaxial rotation of dabber. Install the holding ring on positioner, the positioner centre gripping can make the installation of holding ring more stable in the up end of holding ring and terminal surface down to can support the holding ring, prevent that the part from warping, in addition, the utility model discloses on can being applied to ordinary drilling machine, the cost is lower for processing on five machining center equipment.

Description

Jig fixture

Technical Field

The utility model relates to a parts machining technology field, more specifically say, relate to a jig anchor clamps.

Background

32 evenly distributed holes in the engine positioning ring need to be machined through five-axis machining center equipment, the clamp is designed conventionally, is simple and easy to understand, can meet technological requirements, but the five-axis machining center equipment is short, equipment machining cost is high, control over production cost is not facilitated, and resources are optimized. In addition, the part is a thin-wall part (the wall thickness is only 2mm), and the milling cutter is perpendicular to the processed surface at an angle of 45 degrees due to the fact that the cutting force of five-axis machining is large, so that the excircle wall thickness deformation of the part is generated, and the processed surface is upwards convex.

In summary, how to prevent the deformation of the wall thickness of the outer circle of the part and reduce the cost when the part is machined is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a jig anchor clamps that can prevent to lead to part excircle wall thickness to warp and reduce cost when processing the part.

In order to achieve the above object, the present invention provides the following technical solutions:

a jig fixture, comprising: the base, the rotatable dabber that is equipped with the axis direction for predetermineeing inclination on the base, be connected with on the dabber and be used for adjusting dabber turned angle's indexing mechanism, the spindle is connected with positioner, positioner is used for the centre gripping the up end and the lower terminal surface of holding ring, and drive the holding ring is followed the coaxial rotation of dabber.

Preferably, the base including be in the bottom the diaphragm and set up in on the diaphragm, be equipped with the swash plate of predetermineeing inclination, be equipped with the perpendicular to on the swash plate the face of swash plate, be used for the installation the axle sleeve of dabber.

Preferably, the indexing mechanism comprises an indexing disc which is coaxially and fixedly connected with the mandrel, a plurality of indexing holes are uniformly distributed in the disc surface along the circumferential direction, the disc surface of the indexing disc is parallel to the plate surface of the inclined plate, the base is provided with a worm gear mechanism, the worm gear of the worm gear mechanism is axially connected with a handle which is used for driving the worm gear to rotate, and the rotation of the worm gear is used for driving the worm of the worm gear mechanism to linearly reciprocate so that the plug pin arranged at one end of the worm is inserted into or pulled out of one of the indexing holes.

Preferably, a worm sleeve for allowing the worm to axially move is arranged on the base, and an elastic part is arranged at one end of the worm, which is opposite to the inserted pin.

Preferably, a shaft hole is formed in one end, opposite to the plug pin, of the worm and is axially arranged along the worm, and a spiral spring is inserted into the shaft hole.

Preferably, the base is provided with a drill bushing for guiding the drill bit to drill towards the surface to be processed of the positioning ring.

Preferably, the positioning device includes a supporting portion for fitting to a lower end surface of the positioning ring and a pressing portion for pressing the upper end surface of the positioning ring so that the positioning ring is pressed to the supporting portion, and the supporting portion is fixedly connected to the mandrel.

Preferably, the supporting portion comprises a positioning body fixedly connected with the mandrel and a supporting ring sleeved on the positioning body, the supporting ring is used for supporting the lower end face of the to-be-machined surface of the positioning ring, the positioning body is used for supporting the axial lower end face of the positioning ring, a plurality of drill holes are formed in a ring surface, attached to the positioning ring, of the supporting ring, angles, corresponding to the axis of the supporting ring, of the drill holes correspond to angles, corresponding to the axis of the dividing plate, of the dividing holes one by one, and the axis of any one of the drill holes, located right below the drill sleeve, is collinear with the axis of the drill sleeve.

Preferably, the positioning body comprises a shaft rod, the lower end of the shaft rod is fixedly connected with the mandrel, an annular step surface is arranged on the periphery of the shaft rod, the annular step surface comprises a first annular step surface and a second annular step surface, the first annular step surface is used for supporting the axial lower end surface of the positioning ring, the second annular step surface is used for installing the pressing portion, and the pressing portion is used for pressing the positioning ring onto the first annular step surface.

Preferably, the pressing portion comprises a nut and a pressing plate sleeved on the second annular step surface, an external thread matched and connected with an internal thread of the nut is arranged on the periphery of the shaft rod upward along the second annular step surface, and the nut can be axially adjusted to be located on the external thread so as to push the pressing plate to be pressed on the upper end surface of the positioning ring or leave the pressing plate.

The utility model provides a pair of jig anchor clamps, include: the base, the rotatable dabber that is equipped with the axis direction for predetermineeing inclination on the base, the spindle is connected with the indexing mechanism who is used for adjusting dabber turned angle, is connected with positioner on the spindle, and positioner is used for the up end and the lower terminal surface of centre gripping holding ring to drive the holding ring along with the coaxial rotation of dabber.

The utility model provides a jig clamp can be applied to ordinary drilling machine and carry out processing, places the base on ordinary drilling machine's workstation, can be according to the angle adjustment dabber of drill bit preset angle to adjust the angle of holding ring, make the machined surface of holding ring process perpendicular drill bit, because the utility model discloses in be connected with positioner on the dabber, install the holding ring on positioner, positioner centre gripping in the up end and the lower terminal surface of holding ring, can make the installation of holding ring more stable, and can support the holding ring, prevent that the part is out of shape; in addition, because be equipped with indexing mechanism at the dabber, can adjust the turned angle of dabber, and positioner can rotate along with the dabber to drive the holding ring and can rotate along with the dabber is coaxial, and because be equipped with indexing mechanism on the dabber, after adjusting the dabber and rotating certain angle, the holding ring also can rotate certain angle, thereby makes the hole that the holding ring can process the equipartition.

The utility model discloses an upper and lower terminal surface of centre gripping holding ring is with the stable installation holding ring to make the holding ring obtain supporting and can prevent that the holding ring warp, in addition, the utility model discloses can be applied to on the ordinary drilling machine, the cost is lower for processing on five-axis machining center equipment.

Drawings

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

Fig. 1 is a cross-sectional view of a jig fixture provided by the present invention;

fig. 2 is a sectional view of the positioning ring according to the present invention;

fig. 3 is a schematic view of the handle installation provided by the present invention;

fig. 4 is a sectional view of the worm and gear mechanism provided by the present invention;

fig. 5 is a partial enlarged view of the index plate according to the present invention.

In FIGS. 1-5:

the device comprises a sliding rod 1, a drill bushing 2, a round nut 3, a nut 4, a pressure plate 5, a positioning ring 6, a support ring 7, an indexing disc 8, a shaft sleeve 9, a base 10, a mandrel 11, a drill plate 12, a positioning body 13, a handle 14, a worm wheel 15, a worm 16, a spiral spring 17, a bush 18, a plug 19, an indexing hole 20, an oil injection hole 21 and a sealing ring 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

The core of the utility model is to provide a jig anchor clamps that can prevent to lead to part excircle wall thickness to warp and reduce cost when processing the part

Referring to fig. 1 to 5, fig. 1 is a cross-sectional view of a jig fixture provided by the present invention; fig. 2 is a sectional view of the positioning ring according to the present invention; fig. 3 is a schematic view of the handle installation provided by the present invention; fig. 4 is a sectional view of the worm and gear mechanism provided by the present invention; fig. 5 is a partial enlarged view of the index plate according to the present invention.

A jig fixture, comprising: the base 10, the base 10 is last rotatable to be equipped with axis direction for predetermineeing inclination's dabber 11, is connected with the indexing mechanism who is used for adjusting 11 turned angle of dabber on the dabber 11, is connected with positioner on the dabber 11, and positioner is used for the up end and the lower terminal surface of centre gripping holding ring 6 to drive holding ring 6 along with the coaxial rotation of dabber 11.

It should be noted that the positioning ring 6 includes a flat ring and a to-be-processed ring which is arranged along the outer periphery of the flat ring and has a certain angle with the flat ring, the inner ring of the to-be-processed ring is connected to the outer periphery of the flat ring, the to-be-processed ring is in the shape of the annular outer peripheral surface of a circular truncated cone, an included angle between the to-be-processed ring and the flat ring is usually 45 °, the upper end surface of the positioning ring 6 is the upper end surface of the flat ring, the lower end surface of the positioning ring 6 includes the lower end surface of the flat ring and the inner side ring surface of the to-be-processed ring, and the drill passes through the outer side ring surface processing hole of. The utility model discloses owing to can be applied to and go up processing on the ordinary drilling machine, the drill bit is installed on ordinary drilling machine main shaft, the main shaft is perpendicular to drilling machine workstation, so must make the central line perpendicular to workstation in every hole that the part processed, the shape of workstation is flat, can set up the bottom surface of base 10 into the plane, can place stably on the workstation, the angle of predetermineeing of dabber 11 this moment can be for being 45 in the slant with the bottom surface of base 10, so that the flat ring of holding ring 6 is adorned on positioner with dabber 11 with axle sleeve 9, can make holding ring 6 wait to process the ring and be on a parallel with the workstation, the perpendicular to drill bit promptly.

Because a plurality of through holes processed on the ring to be processed of the positioning ring 6 are uniformly distributed on the ring surface of the ring to be processed, when the rotating angle of the mandrel 11 is adjusted, the indexing mechanism is utilized to rotate in a mode of equal rotating angle, so that the rotating angle of the mandrel 11 is equal, even if the positioning ring 6 and the mandrel 11 coaxially rotate, and the rotating angles of the positioning ring 6 and the mandrel 11 are equal.

The utility model provides a jig clamp can be applied to ordinary drilling machine and carry out processing, places base 10 on ordinary drilling machine's workstation, can be according to the angle adjustment dabber 11 of drill bit preset angle to adjust the angle of holding ring 6, make the machined surface of holding ring 6 perpendicular drill bit process, because the utility model discloses in be connected with positioner on dabber 11, install holding ring 6 on positioner, positioner centre gripping is in the up end and the lower terminal surface of holding ring 6, can make the installation of holding ring 6 more stable, and can support holding ring 6, prevent that the part is out of shape; in addition, because be equipped with indexing mechanism on dabber 11, can adjust the turned angle of dabber 11, and positioner can rotate along with dabber 11 to drive holding ring 6 and can rotate along with the dabber 11 is coaxial, and because be equipped with indexing mechanism on dabber 11, after adjusting dabber 11 and rotating certain angle, holding ring 6 also can rotate certain angle, thereby makes holding ring 6 can process the hole of equipartition.

The utility model discloses an upper and lower terminal surface of centre gripping holding ring 6 is in order to stabilize installation holding ring 6 to make holding ring 6 obtain to support and can prevent holding ring 6 and warp, in addition, the utility model discloses can be applied to on the ordinary drilling machine, the cost is lower for processing on five-axis machining center equipment.

On the basis of the above embodiment, the base 10 includes the diaphragm that is in the bottom and set up on the diaphragm, be equipped with the swash plate of predetermineeing inclination, be equipped with the axle sleeve 9 that is used for installing dabber 11 of the face of perpendicular to swash plate on the swash plate. The diaphragm is the flat board, and the bottom surface is the plane, can place on the workstation, and the swash plate is 45 angles in the slant with the diaphragm, because dabber 11 is 45 with the diaphragm, when setting up the axle sleeve 9 of dabber 11, makes the face of axis direction perpendicular to swash plate of axle sleeve 9 to can make the anchor ring 6 wait to process the anchor ring perpendicular to drill bit behind the installation anchor ring 6 on the dabber 11, be convenient for drill. The structure is simple, the arrangement is convenient, when the ring surface to be processed rotates to each angle, the ring surface to be processed right below the drill bit is perpendicular to the drill bit, and the drilling angle can be guaranteed.

On the basis of the above embodiment, the indexing mechanism includes an indexing disc 8 which is coaxially and fixedly connected with the mandrel 11 and is provided with a plurality of indexing holes 20 uniformly distributed along the circumferential direction on the disc surface, the disc surface of the indexing disc 8 is parallel to the plate surface of the inclined plate, the base 10 is provided with a worm gear mechanism, the worm gear 15 of the worm gear mechanism is axially connected with a handle 14 for driving the worm gear 15 to rotate, the rotation of the worm gear 15 is used for driving the worm 16 of the worm gear mechanism to linearly reciprocate, so that the plug pin 19 arranged at one end of the worm 16 is inserted into or pulled out of one indexing hole 20.

The dividing plate 8 is disc-shaped, the axis of the dividing hole 20 is perpendicular to the plate surface of the dividing plate 8, and the dividing plate 8 is coaxially and fixedly connected with the mandrel 11, so that the plate surface of the dividing plate 8 is perpendicular to the axis of the mandrel 11, and the plate surface of the dividing plate 8 is parallel to the plate surface of the inclined plate, so that no friction is generated between the dividing plate 8 and the base 10 when the dividing plate 8 rotates. The index holes 20 are uniformly distributed on the index plate 8, the number of the holes of the index plate 8 can be set according to the number of the holes on the positioning ring 6 which needs to be machined in actual needs, the number of the holes which need to be machined on the positioning ring 6 is consistent with the number of the index holes 20, and the spindle 11 and the positioning ring 6 synchronously rotate due to the synchronous rotation of the index plate 8 and the spindle 11, so that the index plate 8 and the positioning ring 6 synchronously rotate.

The outer end of the worm wheel 15 is connected with a handle 14, the handle 14 can drive the worm wheel 15 to rotate, when the worm wheel 15 is driven to rotate forwards and backwards, the worm 16 which is matched with the worm wheel 15 can do linear reciprocating motion, for example, when the worm wheel 15 is driven to rotate clockwise by the handle 14, the pin 19 arranged on the worm 16 is drawn out of the indexing hole 20, and the indexing disc 8 is rotated, so that the adjacent indexing hole 20 of the indexing hole 20 drawn out by the worm 16 is aligned with the pin 19; when the handle 14 is used for driving the worm wheel 15 to rotate anticlockwise, the inserted pin 19 arranged on the worm 16 is inserted into the indexing hole 20 corresponding to the inserted pin 19, so that the indexing rotation of the positioning ring 6 is completed.

The embodiment utilizes the worm gear mechanism to divide the positioning ring 6, thereby facilitating installation, processing and operation and ensuring accurate division.

In the above embodiment, the base 10 is provided with a worm sleeve for axially moving the worm 16, and the end of the worm 16 opposite to the plug 19 is provided with an elastic member. The worm housing is used to provide a place for movement of the worm 16 and a bushing 18 for reducing friction may be provided between the worm housing and the worm 16. The elastic member arranged at the other end of the worm 16 can provide elastic force to the axial direction of the worm 16, the elastic force is increased after the handle 14 drives the worm 16 to leave the indexing hole 20, after the indexing disc 8 is rotated, the worm 16 can be pushed to the indexing hole 20 under the action of the elastic force, so that the bolt 19 can be inserted into the indexing hole 20, and the bolt 19 can be ensured to be always inserted into the indexing hole 20 under the action of the elastic member without being driven by the handle 14.

In addition to the above-described embodiments, regarding the arrangement of the elastic member, it is preferable that the end of the worm 16 opposite to the plug 19 is provided with a shaft hole arranged along the axial direction of the worm 16, and the coil spring 17 is inserted into the shaft hole. One end of the spiral spring 17 is inserted into the shaft hole and abuts against the bottom surface of the shaft hole, and the other end abuts against the inner wall of the shaft sleeve 9 opposite to the shaft hole, so that elastic force is generated, the spiral spring 17 has good axial force, and the worm 16 can be ensured to be stressed axially.

On the basis of the above embodiment, in order to facilitate guiding the drill to point to the surface to be processed of the positioning ring 6, the drill bushing 2 for guiding the drill to point to the surface to be processed of the positioning ring 6 is arranged on the base 10. The drill bit is inserted into the drill sleeve 2, the drill sleeve 2 is hinged on the upper part of the inclined plate through the drill plate 12, when the drill needs to be drilled, the drill sleeve 2 is put down to align with the positioning ring 6, and then the drill bit is operated to penetrate through the drill sleeve 2.

On the basis of the above embodiment, the positioning device includes a supporting portion for being attached to the lower end surface of the positioning ring 6 and a pressing portion for pressing the upper end surface of the positioning ring 6 so as to press the positioning ring 6 against the supporting portion, and the supporting portion is fixedly connected to the mandrel 11. The positioning device can fix the positioning ring 6 from two directions, the supporting part is fixedly connected with the mandrel 11 and can synchronously rotate, and the pressing part can be connected with the supporting part to enable the positioning ring 6 to be clamped by the positioning device and the supporting part.

Preferably, the supporting portion comprises a positioning body 13 fixedly connected with the mandrel 11 and a supporting ring 7 sleeved on the positioning body 13, the supporting ring 7 is used for supporting the lower end face of the surface to be processed of the positioning ring 6, the positioning body 13 is used for supporting the axial lower end face of the positioning ring 6, a plurality of drill holes are formed in the ring surface of the supporting ring 7, which is attached to the positioning ring 6, the angles of the drill holes relative to the axis of the supporting ring 7 and the angles of the indexing holes 20 relative to the axis of the indexing disc 8 are in one-to-one correspondence, and the axis of any one drill hole positioned right below the drill sleeve 2 is collinear with.

It should be noted that the axial lower end surface of the positioning body 13 is the lower end surface of the flat ring and the lower end surface of the surface to be processed in the above description, the surface to be processed is the surface of the ring to be processed, the lower end surface is the inner side surface of the ring to be processed, when a drill hole on the supporting ring 7 rotates to a position right below the drill bit, the drill bit drills the positioning ring 6 downwards, the drill bit cuts off the part of the positioning ring 6 needing to be drilled, the part drops through the drill hole below to complete drilling, and because the angles of the plurality of drill holes relative to the axis of the support ring 7 and the angles of the indexing holes 20 relative to the axis of the indexing disc 8 correspond one to one, therefore, when the index plate 8 rotates by the angle of one hole, the drill hole also rotates by the angle of one hole, and the connecting line of the drill hole and the index hole 20 passes through the axis of the index plate 8, so that the angle between the adjacent drill holes is equal to the angle between the adjacent index holes 20. The drilling position of the support ring 7 provided by the embodiment is clearly visible, and the adjustment is convenient.

On the basis of the above embodiment, the positioning body 13 includes a shaft rod having a lower end fixedly connected to the mandrel 11, an annular step surface is provided on the outer periphery of the shaft rod, the annular step surface includes a first annular step surface for supporting the axial lower end surface of the positioning ring 6 and a second annular step surface for installing a pressing portion, and the pressing portion is used for pressing the positioning ring 6 onto the first annular step surface.

It should be noted that, axostylus axostyle and dabber 11 coaxial coupling, support ring 7 suit are equipped with the bar hole on the axostylus axostyle of the below of first annular step face, the opening direction in bar hole is towards the radial of axostylus axostyle, and the length direction in bar hole sets up along the radial of axostylus axostyle.

The axial of the upper end center along the axostylus axostyle is to having logical groove, and the bar hole is opened on the lateral wall that leads to the groove, and logical inslot interpolation is equipped with slide bar 1, and the lower extreme of slide bar 1 is equipped with the cylindric lock that passes the bar hole, and the length direction of cylindric lock is unanimous with the opening direction in bar hole, and the cylindric lock can slide in the bar hole under slide bar 1's drive, and logical groove endwise slip can be followed to slide bar 1.

The cylindrical pin extends out of the strip-shaped hole and abuts against the lower end face of the support ring 7, the upper end of the sliding rod 1 is provided with the round nut 3, the round nut 3 can provide pressing force for moving towards the second annular step face, so that the pressing part is pressed against the second annular step face, and after the round nut 3 moves towards the second annular step face until the second annular step face cannot move axially, the sliding rod 1 can slide upwards along the axial direction under the action of the threads, at the moment, the cylindrical pin can move upwards to press the support ring 7, and the support ring 7 is pressed against the bottom face of the first annular step face. The structure provided by the embodiment can stably fix the positioning ring 6, does not move in the machining process, and can prevent the positioning ring 6 from deforming.

On the basis of the above embodiment, the pressing portion includes the nut 4 and the pressing plate 5 sleeved on the second annular step surface, the outer periphery of the shaft lever upward along the second annular step surface is provided with the external thread in fit connection with the internal thread of the nut 4, and the nut 4 can be axially adjusted to be located on the external thread to push the pressing plate 5 to press on the upper end surface of the positioning ring 6 or leave the pressing plate 5.

It should be noted that the pressing portion is disposed between the round nut 3 and the second annular step surface, a washer is disposed on the shaft rod above the pressing plate 5, the nut 4 presses against the washer and transmits the pressing force to the pressing plate 5, and a round washer is further disposed between the round nut 3 and the nut 4, so that the transmitted pressing force can be dispersed to the pressing plate 5, and the pressing plate 5 can be pressed against the positioning ring 6. The embodiment has the advantages of simple structure and strong operability.

When the jig fixture works, cutting fluid and iron scraps are generated, and a sealing ring 22 is designed on the dividing disc 8 in order to prevent surrounding dust from immersing into the jig fixture. The oil injection hole 21 is designed on the index plate to facilitate the periodic oil injection, so that the index plate 8 can rotate flexibly during working. The screw in the oil filling hole 21 is screwed out, so that oil can be filled.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It is right above that the utility model provides a jig anchor clamps have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A jig fixture, comprising: base (10), rotatable dabber (11) that are equipped with the axis direction for predetermineeing inclination on base (10), be connected with on dabber (11) and be used for adjusting dabber (11) turned angle's indexing mechanism, be connected with positioner on dabber (11), positioner is used for the up end and the lower terminal surface of centre gripping holding ring (6), and drives holding ring (6) are followed dabber (11) coaxial rotation.

2. The jig clamp as claimed in claim 1, wherein the base (10) comprises a cross plate at the bottom and an inclined plate arranged on the cross plate and provided with a preset inclination angle, and the inclined plate is provided with a shaft sleeve (9) perpendicular to the surface of the inclined plate and used for mounting the mandrel (11).

3. The jig fixture as claimed in claim 2, wherein the indexing mechanism comprises an indexing disc (8) which is coaxially and fixedly connected with the mandrel (11) and is provided with a plurality of indexing holes (20) uniformly distributed along the circumferential direction on the disc surface, the disc surface of the indexing disc (8) is parallel to the plate surface of the inclined plate, the base (10) is provided with a worm gear mechanism, a handle (14) for driving the worm gear (15) to rotate is axially connected with a worm wheel (15) of the worm gear mechanism, and the rotation of the worm wheel (15) is used for driving a worm (16) of the worm gear mechanism to linearly reciprocate so as to enable a plug pin (19) arranged at one end of the worm (16) to be inserted into or pulled out of one of the indexing holes (20).

4. The jig clamp as claimed in claim 3, wherein the base (10) is provided with a worm sleeve for axially moving the worm (16), and the worm (16) is provided with an elastic member at an end opposite to the plug pin (19).

5. The jig clamp as claimed in claim 4, wherein the end of the worm (16) opposite to the pin (19) is provided with a shaft hole arranged axially along the worm (16), and a coil spring (17) is inserted into the shaft hole.

6. The jig clamp as claimed in claim 5, wherein the base (10) is provided with a drill bushing (2) for guiding a drill bit to drill towards the surface to be machined of the positioning ring (6).

7. The jig clamp as claimed in claim 6, wherein the positioning means comprises a support portion for engaging with the lower end surface of the positioning ring (6) and a pressing portion for pressing the upper end surface of the positioning ring (6) to press the positioning ring (6) against the support portion, the support portion being fixedly connected to the mandrel (11).

8. The jig clamp according to claim 7, wherein the supporting portion comprises a positioning body (13) fixedly connected with the mandrel (11) and a supporting ring (7) sleeved on the positioning body (13), the supporting ring (7) is used for supporting the lower end face of the surface to be processed of the positioning ring (6), the positioning body (13) is used for supporting the axial lower end face of the positioning ring (6), a plurality of drill holes are arranged on the ring surface of the supporting ring (7) and the positioning ring (6), the angles of the drill holes relative to the shaft center of the supporting ring (7) correspond to the angles of the indexing holes (20) relative to the shaft center of the indexing disc (8) in a one-to-one manner, and the axis of any one drill hole positioned right below the drill sleeve (2) is collinear with the axis of the drill sleeve (2).

9. The jig clamp as claimed in claim 8, wherein the positioning body (13) comprises a shaft rod fixedly connected at its lower end to the mandrel (11), and an annular step surface is provided on the outer circumference of the shaft rod, and the annular step surface comprises a first annular step surface for supporting the axially lower end surface of the positioning ring (6) and a second annular step surface for mounting the pressing portion for pressing the positioning ring (6) against the first annular step surface.

10. The jig clamp as claimed in claim 9, wherein the pressing part comprises a nut (4) and a pressing plate (5) sleeved on the second annular step surface, an external thread matched and connected with the internal thread of the nut (4) is arranged on the outer periphery of the shaft rod upwards along the second annular step surface, and the nut (4) can be axially adjusted to be in the position on the external thread so as to push the pressing plate (5) to press the upper end surface of the positioning ring (6) or leave the pressing plate (5).

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