CN210937210U

CN210937210U - Universal inner hole clamping fixture

Info

Publication number: CN210937210U
Application number: CN201921873717.1U
Authority: CN
Inventors: 姚朋昌; 熊培炽; 陈晓波; 曾庆豪; 齐真
Original assignee: Changzhou Shujia Machinery Co ltd
Current assignee: Changzhou Shujia Machinery Co ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-07-07
Anticipated expiration: 2029-11-01

Abstract

The utility model discloses a general hole clamping fixture, which belongs to the technical field of lathe clamping, and the technical scheme is characterized in that the general hole clamping fixture comprises a machine tool mandrel and a hole clamping workpiece, and further comprises a conical sleeve, a spring chuck and a locking nut, wherein the machine tool mandrel comprises an integrally formed chuck seat, a conical shaft and a threaded shaft, the spring chuck comprises a threaded part and a petal spring part, the conical sleeve is sleeved on the conical shaft, the threaded part is fixedly sleeved on the circumferential outer side of the chuck seat, the petal spring part is sleeved on the circumferential outer side of the conical sleeve, and the inner conical surface of the petal spring part is matched with the outer conical surface of the conical sleeve; the inner hole clamping workpiece sleeve is arranged on the circumferential outer side of the petal spring portion, and the locking nut is connected with the threaded shaft and locked towards one side of the petal spring portion. The utility model is suitable for a parts machining that needs centre gripping hole turning excircle, it is big to have specification application scope, convenient to use, and the lower effect of cost.

Description

Universal inner hole clamping fixture

Technical Field

The utility model belongs to the technical field of the lathe centre gripping technique and specifically relates to a general hole centre gripping anchor clamps are related to.

Background

The spring chuck is a lathe accessory which utilizes the elastic deformation of a clamping jaw to center and clamp a workpiece or a cutter, and is also the most commonly used lathe inner hole workpiece clamping fixture.

The pull-in type spring chuck is a typical structure of the spring chuck, and a head part with an outer cone is axially provided with 3 or 4 equally-divided long grooves to form clamping jaws capable of contracting. The shape of the inner hole of the spring chuck can be made into a circle, a square or a hexagon according to the section shape of an object to be clamped; the middle part is a thin-wall section which plays the role of elastic deformation; the part is threaded and is connected with the pull rod, and the outer conical surface of the spring chuck is matched with the conical hole of the main shaft.

Among the above-mentioned prior art scheme, collet chuck is generally designed according to the lathe model, belongs to nonstandard spare, and collet chuck cost of processing is higher, if the external diameter type of processing work piece is more need design the collet chuck of different specifications, increases the kind, and the cost is higher, and it is also inconvenient to use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a general hole centre gripping anchor clamps has that specification application scope is big, convenient to use, and the lower effect of cost.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a universal inner hole clamping fixture comprises a machine tool mandrel, an inner hole clamping workpiece, a conical sleeve, a spring chuck and a locking nut, wherein the machine tool mandrel comprises a chuck seat, a conical shaft and a threaded shaft which are integrally formed; the inner hole clamping workpiece sleeve is arranged on the circumferential outer side of the petal spring portion, and the locking nut is connected with the threaded shaft and locked towards one side of the petal spring portion.

Through adopting above-mentioned technical scheme, with the assembly of toper sleeve in collet chuck, only need design out corresponding collet chuck according to toper sleeve's size, can no longer redesign the collet chuck in the follow-up use and change, only need replace toper sleeve according to the size of hole centre gripping work piece to through lock nut's precession distance, the state of strutting of adjustment lamella spring portion can, specification application scope is big, convenient to use, and improved collet chuck's life-span, and can greatly reduced use cost.

The utility model discloses further set up to, screw thread portion orientation chuck seat one end is equipped with integrated into one piece's step axle, screw thread portion outer wall fixed cover is equipped with the holding ring, and the holding ring is located the step axle with between the hole centre gripping work piece.

Through adopting above-mentioned technical scheme, the holding ring is used for preventing that the angle that petal spring portion was propped open the deformation is too big, can be convenient for petal spring portion to keep the elasticity of recovering to effectively prolong petal spring portion's life.

The utility model discloses further set up to, the collet chuck inner wall is equipped with dodges the groove, just dodge the trench in screw thread portion with lamella spring portion junction.

Through adopting above-mentioned technical scheme, dodge the groove and can prevent that lamella spring portion inside wall and holder seat tip chamfer from producing the friction to be convenient for strut of lamella spring portion.

The utility model discloses further set up to, lock nut orientation the bell jar has been seted up to bell shaft one side inner wall, just the internal diameter of notch department of bell jar is greater than the little end external diameter of toper sleeve.

Through adopting above-mentioned technical scheme, the bell jar is used for dodging the toper sleeve tip, makes things convenient for lock nut to screw in towards petal spring portion one side for petal spring portion can further be propped open by the extrusion.

The utility model discloses further set up to, lock nut orientation the elastic retaining ring is connected to toper sleeve one side, just elastic retaining ring's internal diameter more than or equal to the internal diameter of notch department of bell jar.

Through adopting above-mentioned technical scheme, circlip is used for reducing lock nut to lamella spring portion head wearing and tearing to promote the life of lamella spring portion and lamella spring portion head, reduce collet chuck's replacement cost.

The utility model discloses further set up to, the taper sleeve orientation lock nut one end inside wall with be equipped with the elastic sealing material layer between the conical shaft.

Through adopting above-mentioned technical scheme, elasticity sealing material layer is used for preventing in impurity gets into the toper sleeve, and can strengthen the cooperation tightness between toper sleeve and the conical shaft.

The utility model discloses further set up to, the lock nut lateral wall is equipped with the non slipping spur along its axis symmetry.

Through adopting above-mentioned technical scheme, the non slipping spur is used for making things convenient for lock nut's precession, saves the required strength of swivel nut for lamella spring portion can be strutted fast, thereby makes hole centre gripping work piece by quick stable centre gripping.

To sum up, the utility model discloses following beneficial effect has:

1. through the arrangement of the conical sleeve, the spring chuck and the locking nut, the effects of large specification application range, convenience in use and lower cost can be achieved;

2. through the arrangement of the positioning ring, the effect of preventing the petal spring part from being expanded and deformed by an overlarge angle and facilitating the petal spring part to keep the recovered elasticity can be achieved;

3. through the arrangement of the avoiding groove and the conical groove, the effect of avoiding chamfers at the small end parts of the chuck seat and the conical sleeve and enabling the reed part to be further squeezed and opened can be achieved.

Drawings

Fig. 1 is a schematic view of the overall structure of the internal hole clamping fixture in the embodiment.

FIG. 2 is a schematic sectional view of the overall structure of the female clamping fixture of this embodiment.

Fig. 3 is a partially enlarged view of portion a of fig. 2, illustrating the connection of the resilient sealing material layer to the tapered sleeve.

In the figure, 1, a machine tool mandrel; 11. a chuck base; 12. a tapered shaft; 13. a threaded shaft; 2. a collet chuck; 21. a step shaft; 22. a threaded portion; 23. a reed part; 24 avoidance slots; 3. locking the nut; 31. anti-skid blocks; 32. a tapered groove; 4. the inner hole clamps the workpiece; 5. a tapered sleeve; 6. a positioning ring; 7. a layer of resilient sealing material; 71. a circlip is provided.

Detailed Description

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

Example (b):

referring to fig. 1, the universal inner hole clamping fixture disclosed in this embodiment includes a machine tool spindle 1, an inner hole clamping workpiece 4, a tapered sleeve 5, a collet chuck 2, and a lock nut 3. The machine tool mandrel 1 is positioned on a lathe (not shown in the figure), and conical sleeves 5 with different tapers are selected outside the machine tool mandrel 1 according to the size of an inner hole clamping workpiece 4 and are matched with spring chucks 2 with the same specification. The method comprises the following steps of sleeving a spring chuck 2 on a conical sleeve 5, installing the conical sleeve 5 on a machine tool mandrel 1, then, locking a locking nut 3 at one end of the machine tool mandrel 1 in a rotating mode and locking the end of the machine tool mandrel 1 towards one side of the spring chuck 2, so that the spring chuck 2 is unfolded, and an inner hole is clamped on a workpiece 4.

Referring to fig. 1 and fig. 2, further, in this embodiment, the machine tool spindle 1 includes a chuck base 11, a tapered shaft 12 and a threaded shaft 13 that are sequentially and integrally formed, the collet chuck 2 includes a threaded portion 22 and a petal spring portion 23, the threaded portion 22 is in threaded connection with an outer side wall of the chuck base 11, the tapered sleeve 5 is fixedly sleeved on the tapered shaft 12, the petal spring portion 23 is sleeved on an outer conical surface of the tapered sleeve 5, and an inner conical surface of the petal spring portion 23 is attached to the outer conical surface of the tapered sleeve 5. The locking nut 3 is in threaded connection with the threaded shaft 13 and screwed in towards one side of the petal spring part 23 to extrude the end face of the petal spring part 23, so that the middle part of the petal spring part 23 is stressed to be bent and spread, and the inner hole clamping workpiece 4 is clamped. Since the pressing force required by the petal spring portion 23 is large, in order to facilitate screwing the nut, anti-slip blocks 31 are symmetrically arranged on the outer side wall of the lock nut 3 along the axis thereof.

Referring to fig. 2 and 3, in order to reduce friction between the petal spring portion 23 and the collet holder 11 when the petal spring portion 23 is expanded along the taper direction of the outer tapered surface of the tapered sleeve 5, an avoiding groove 24 is formed in the inner wall of the collet chuck 2, and the avoiding groove 24 is located at the connection position of the threaded portion 22 and the petal spring portion 23. Further, in the present embodiment, in order to prevent the petal spring portion 23 from being further expanded due to the abutment with the small end of the tapered sleeve 5 when the lock nut 3 is screwed toward the petal spring portion 23, the inner wall of the lock nut 3 toward the tapered shaft 12 is provided with the tapered groove 32, and the inner diameter of the notch of the tapered groove 32 is larger than the outer diameter of the small end of the tapered sleeve 5 to avoid the small end of the tapered sleeve 5.

Referring to fig. 1, in order to prevent the spring chuck 2 from being deformed due to a too large angle of being spread, the positioning ring 6 is preferably fixed on the outer wall of the threaded portion 22, the integrally formed stepped shaft 21 is arranged at the end of the threaded portion 22 facing the chuck base 11, and the positioning ring 6 is located between the stepped shaft 21 and the inner hole clamping workpiece 4.

Referring to fig. 2 and 3, in order to prevent iron chips, dust particles and the like from penetrating between the tapered sleeve 5 and the tapered shaft 12 to cause abrasion of the tapered sleeve 5 when the lock nut 3 is screwed in, an elastic sealing material layer 7 is provided on an inner side wall of one end of the tapered sleeve 5 facing the lock nut 3. In this embodiment, the elastic sealing material layer 7 is made of a sealing rubber material. Preferably, in order to reduce the abrasion of the locknut 3 to the end of the collet chuck 2, a circlip 71 is connected to the locknut 3 facing the tapered sleeve 5, and the inner diameter of the circlip 71 is greater than or equal to the inner diameter of the notch of the tapered groove 32.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a general hole centre gripping anchor clamps, includes lathe dabber (1) and hole centre gripping work piece (4), its characterized in that: the machine tool spindle comprises a machine tool spindle body and is characterized by further comprising a conical sleeve (5), a spring chuck (2) and a locking nut (3), wherein the machine tool spindle body (1) comprises a chuck base (11), a conical shaft (12) and a threaded shaft (13) which are integrally formed, the spring chuck (2) comprises a threaded portion (22) and a petal spring portion (23), the conical sleeve (5) is sleeved on the conical shaft (12), the threaded portion (22) is fixedly sleeved on the circumferential outer side of the chuck base (11), the petal spring portion (23) is sleeved on the circumferential outer side of the conical sleeve (5), and an inner conical surface of the petal spring portion (23) is matched with an outer conical surface of the conical sleeve (5); hole centre gripping work piece (4) cover is established petal spring portion (23) circumference outside, lock nut (3) with threaded shaft (13) are connected and are faced petal spring portion (23) one side locking.

2. The universal female clamping fixture as recited in claim 1, further comprising: screw thread portion (22) orientation holder (11) one end is equipped with integrated into one piece's step axle (21), the fixed cover of screw thread portion (22) outer wall is equipped with holding ring (6), and holding ring (6) are located step axle (21) with between hole centre gripping work piece (4).

3. The universal female clamping fixture as recited in claim 1, further comprising: the inner wall of the spring chuck (2) is provided with an avoiding groove (24), and the avoiding groove (24) is positioned at the joint of the threaded part (22) and the petal spring part (23).

4. The universal female clamping fixture as recited in claim 1, further comprising: the locking nut (3) faces towards the inner wall of one side of the conical shaft (12) and is provided with a conical groove (32), and the inner diameter of the notch of the conical groove (32) is larger than the outer diameter of the small end of the conical sleeve (5).

5. The universal female clamping fixture as recited in claim 4, further comprising: one side, facing the conical sleeve (5), of the locking nut (3) is connected with an elastic check ring (71), and the inner diameter of the elastic check ring (71) is larger than or equal to that of the notch of the conical groove (32).

6. The universal female clamping fixture as recited in claim 1, further comprising: and an elastic sealing material layer (7) is arranged between the inner side wall of one end of the conical sleeve (5) facing the locking nut (3) and the conical shaft (12).

7. The universal female clamping fixture as recited in claim 1, further comprising: and the outer side wall of the locking nut (3) is symmetrically provided with anti-skidding blocks (31) along the axis.