CN219665764U - Switchable center hole-free shaft top clamping tool - Google Patents

Abstract

The utility model relates to the technical field of shafting device machining, in particular to a switchable shaft top clamp tool without a center hole. This top presss from both sides frock includes: a plug-in part and a top-connection part; a clamping groove is formed in one end of the plug-in part; the top connection part is arranged at the other end of the plug-in part, and a central hole is arranged at one end of the top connection part far away from the plug-in part; the plug-in part is further provided with a plurality of first bolt holes at one end provided with the top connection part, and the first bolt holes are axially communicated with the clamping grooves; the external diameter of grafting portion is equipped with the second bolt hole of a plurality of circumference distribution, and the radial intercommunication of second bolt hole is to the draw-in groove. The top clamp fixture is inserted into one end of the shaft body without a central hole, so that the top clamp fixture wraps the end part of the shaft body without the central hole, and bolts are fixed in the first bolt hole and the second bolt hole, so that the top clamp fixture is fixed; and the center hole on the top clamp tool can be matched with a center on a lathe, and the top clamp tool replaces a shaft body to perform splicing work.

Description

Switchable center hole-free shaft top clamping tool

Technical Field

The utility model relates to the technical field of shafting device machining, in particular to a switchable shaft top clamp tool without a center hole.

Background

The existing processing of shaft parts generally adopts a mode of clamping and jacking, and is mainly characterized in that one end of a shaft body is clamped by a claw, and the other end of the shaft body is a center hole of which the tip abuts against the end. The machining of the center hole is time-consuming and labor-consuming, the machining cost is high, the machining precision of the center hole is difficult to ensure, and machining errors are often caused, so that the parts cannot meet the use requirements. Meanwhile, the central hole can damage the end face of the shaft part, the end face plays an extremely important role for some special shaft parts, in order to protect the shaft body, the central hole can not be arranged before the shaft part is processed, but the shaft part cannot be processed when the shaft body is not provided with the central hole or the precision is insufficient due to the damage of the central hole.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a switchable shaft top clamp tool without a central hole, and the shaft parts can be processed by the top clamp tool under the condition that the shaft body is not provided with the central hole or the precision of the central hole of the shaft body is insufficient.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a switchable centerless bore shaft top clamp tooling, the tooling comprising:

the plug-in part is provided with a clamping groove at one end;

the top connection part is arranged at the other end of the plug-in part; the top connection part is provided with a central hole at one end far away from the plug connection part;

the plug-in part is further provided with a plurality of first bolt holes at one end provided with the top connection part, and the first bolt holes are axially communicated with the clamping grooves;

the external diameter of grafting portion is equipped with the second bolt hole of a plurality of circumference distribution, second bolt hole radial intercommunication is to the draw-in groove.

Preferably, 6 to 12 second bolt holes are formed, and the insertion part is uniformly divided according to the second bolt holes.

Preferably, the center hole includes a first taper hole and a second taper hole, the first taper hole is provided at an end of the top connection portion away from the insertion portion, the second taper hole is provided at a taper tip of the first taper hole, and the taper tip of the second taper hole axially extends toward an inside of the top connection portion.

Preferably, the taper of the first taper hole is 120 degrees, and the taper of the second taper hole is 60 degrees.

Preferably, the central hole further comprises a third taper hole, and the third taper hole is arranged at the taper point of the second taper hole.

Preferably, the slot is provided with a rounded corner for transition at the slot opening.

In summary, the utility model has the following advantages:

1. the top clamp fixture is inserted into one end of the shaft body without a central hole, so that the top clamp fixture wraps the end part of the shaft body without the central hole, and bolts are fixed in the first bolt hole and the second bolt hole, so that the top clamp fixture is fixed on the shaft body; and the center hole on the top clamp tool can be matched with a center on a lathe, and the top clamp tool replaces a shaft body to perform splicing.

2. The installation bolt in the first bolt hole can axially position the shaft body, and the installation bolt in the second bolt hole can radially position the shaft body; when the shaft body and the top clamping tool are clamped and propped on a lathe, radial runout of the shaft body needs to be checked. When the radial runout is overlarge, the radial runout of the shaft body is controlled in a specified range by adjusting the bolts in the second bolt holes, so that the top clamping tool can be stably fixed on the shaft body, and the top clamping work is performed by replacing the shaft body.

3. The second bolt holes distributed at least in the circumference are formed in the inserting portion, and radial runout of the shaft body can be better adjusted by arranging more second bolt holes in the circumference.

Drawings

FIG. 1 is a schematic diagram of a shaft body top clamping tool without a center hole and a shaft body;

FIG. 2 is a right side view of the tool and the shaft;

FIG. 3 is a schematic structural diagram of the tooling;

FIG. 4 is a schematic structural view of a sheet;

FIG. 5 is a schematic cross-sectional view of the tool and the shaft;

FIG. 6 is a cross-sectional view of the tooling;

FIG. 7 is a cross-sectional view of a wafer attached to a card slot;

reference numerals: 1. a top clamping tool; 2. a shaft body; 3. a sheet; 11. a plug-in part; 12. a top connection portion; 13. a clamping groove; 14. a central bore; 15. a first bolt hole; 16. a second bolt hole; 21. a shaft end; 22. a third bolt hole; 131. round corners; 141. a first taper hole; 142. a second taper hole; 143. and a third taper hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

At the same time, it should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The following describes the embodiments of the present utility model in detail with reference to the drawings.

As shown in fig. 1 to 7, the top clamping fixture 1 comprises a plugging portion 11 and a top connecting portion 12, the plugging portion 11 is a snap ring, the top connecting portion 12 is a bump integrally arranged at one end of the snap ring, the other end of the snap ring is provided with a clamping groove 13 for plugging the shaft body 2, the overall shape of the top clamping fixture 1 is a stepped convex structure, and a first bolt hole 15 axially communicated with the clamping groove 13 and a second bolt hole 16 radially communicated with the clamping groove 13 are arranged at other positions of the plugging portion 11 except the top connecting portion 12. The clamping groove 13 is provided with a round corner 131 for transition at the notch, and the shaft body 2 is inserted after the convenience.

As shown in fig. 1 and 2, the first bolt holes 15 are circumferentially distributed around the center point on the end of the plugging portion 11 and are located at the periphery of the top connection portion 12, and six first bolt holes 15 are formed, so that the shaft body 2 can be better connected later, and the shaft body 2 is prevented from loosening and falling off in the process of carrying.

As shown in fig. 1 and 2, the second bolt holes 16 are circumferentially arranged around the plugging portion 11, 12 second bolt holes 16 are provided in total, the plugging portion 11 is uniformly and equally divided into 12 parts according to the 12 second bolt holes 16, and the more the second bolt holes 16 are provided, the more accurately the radial runout of the shaft body 2 can be adjusted when the top clamping tool 1 is connected with the shaft body 2.

As shown in fig. 1, 2, 3, 5 and 6, the top connection portion 12 is provided with a central hole 14 for inserting the tip at a middle portion of one end far from the insertion portion 11, and the central hole 14 includes a first taper hole 141, a second taper hole 142 and a third taper hole 143. The first, second and third tapered holes 141, 142 and 143 communicate with each other and sequentially extend axially toward the inside of the top joint 12. Wherein, the first taper hole 141 is disposed at an end of the top connection portion 12 away from the plug portion 11, the second taper hole 142 is disposed at a taper point of the first taper hole 141, and the third taper hole 143 is disposed at a taper point of the second taper hole 142. As seen in the figure, the cross-sectional shapes of the first taper hole 141 and the second taper hole 142 are isosceles trapezoids; the taper of the first taper hole 141 is 120 degrees, so that the second taper hole 142 is protected, and the second taper hole 142 is prevented from being damaged and deformed due to collision when the tip is inserted; the taper of the second taper hole 142 is 60 degrees with the taper of the center, and the space area occupied by the second taper hole 142 is the largest, which is used for ensuring that the tool can be well contacted and matched with the center when the tool is clamped at the top. Wherein the third tapered hole 143 is also provided to avoid sharp corners of the tip from damaging the second tapered hole 142.

As shown in fig. 1 to 7, the shaft body 2 is provided with shaft ends 21 of an integral structure at the middle parts of two ends of the shaft body, the diameter length of the shaft ends 21 is smaller than that of the shaft body 2, and the shaft ends 21 are arranged to facilitate the insertion of the top clamping tool 1.

Before the top clamping tool 1 is inserted into the shaft end 21 without the central hole 14 or the damage of the central hole 14, a circle of thin sheet 3 is arranged in the clamping groove 13, and the thin sheet 3 is attached around the second bolt hole 16 at the inner wall of the clamping groove 13. Wherein the material of the thin sheet 3 is copper or rubber material with soft whole; and the overall length of the sheet 3 is slightly smaller than the inner diameter circumference of the clamping groove 13, so that the sheet 3 cannot completely cover the inner annular wall of the clamping groove 13. At this time, there is a distance L1 between two ends of the sheet 3, and the distance L1 is smaller than the distance L2 between two second bolt holes 16, and when the sheet 3 is attached to the inner wall of the clamping groove 13, all the second bolt holes 16 connected to the clamping groove 13 are completely wrapped. If the two ends of the sheet 3 are in contact with each other during the lamination, the sheet 3 will overlap, which prevents the tool from being inserted into the shaft end 21 and makes the overall structure unstable.

After the sheet 3 is installed, the clamping groove 13 of the tool is sleeved into the shaft end 21 without the central hole 14, the outer diameter surface of the shaft end 21 is abutted against the sheet 3, and the end part of the shaft end 21 is abutted against the inner bottom surface of the clamping groove 13. The tooling is then rotated to align the third bolt hole 22 with the first bolt hole 15, and bolts are used to pass through the first bolt hole 15 and the third bolt hole 22 and lock them. Then wrapping a circle of sheet 3 on the outer diameter of the shaft end 21 at the other side of the shaft body 2, and clamping the shaft end 21 of the wrapped sheet 3 by using a lathe three-jaw; the stress area of the shaft end 21 can be increased by arranging the sheet 3 on the shaft end 21, so that the sheet is not easy to deform when the lathe is clamped by three clamping jaws; the overall length of the foil 3 is here smaller than the outer diameter circumference of the shaft end 21. Thereafter, the lathe is tipped into the center hole 14 of the tooling tipping portion 12, and bolts are installed in the second bolt holes 16; at this time, the sheet 3 provided in the locking groove 13 increases the force receiving area of the shaft end 21 inserted into the locking groove 13, and is not easily deformed by the pressure when the bolt in the second bolt hole 16 is locked.

At this time, the top clamping work is basically completed, but radial runout of the shaft body 2 needs to be checked, and radial runout of the shaft body 2 after the three-jaw clamping and top clamping of the lathe is checked by using a dial indicator. When radial runout of a certain part of the shaft body 2 is larger, the bolts in the first bolt holes 15 need to be loosened slightly, and then the bolts in the second bolt holes 16 corresponding to the radial runout are tightened according to the specific position of the radial runout, wherein the bolts are bolts in the second bolt holes 16 closest to the detection position in a straight line. When the radial runout of the shaft body 2 is within the design range, the bolts in the first bolt holes 15 are locked again, and the lathe can be controlled to process the shaft body 2.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A switchable centerless bore shaft top clamp tooling, the tooling comprising:

the plug-in part (11), one end of the plug-in part (11) is provided with a clamping groove (13);

a top connection part (12) arranged at the other end of the plug-in part (11); the top connection part (12) is provided with a central hole (14) at one end far away from the plug-in part (11);

the plug-in part (11) is further provided with a plurality of first bolt holes (15) at one end provided with the top connection part (12), and the first bolt holes (15) are axially communicated with the clamping grooves (13);

the novel socket is characterized in that a plurality of circumferentially distributed second bolt holes (16) are formed in the outer diameter of the plug-in connection portion (11), and the second bolt holes (16) are radially communicated to the clamping groove (13).

2. The switchable centerless shaft top clamp tool according to claim 1, wherein 6-12 second bolt holes (16) are provided, and the plug-in parts (11) are uniformly equally divided according to the second bolt holes (16).

3. The switchable centerless shaft top clamp tool according to claim 1, wherein the center hole (14) comprises a first taper hole (141) and a second taper hole (142), the first taper hole (141) is arranged at one end of the top connection portion (12) far away from the plug connection portion (11), the second taper hole (142) is arranged at a taper point of the first taper hole (141), and the taper point of the second taper hole (142) axially extends towards the inside of the top connection portion (12).

4. A switchable centerless shaft top clamp assembly according to claim 3 wherein the taper of the first tapered bore (141) is 120 ° and the taper of the second tapered bore (142) is 60 °.

5. A switchable centerless shaft top clamp according to claim 1 or 3, wherein the centerless shaft (14) further comprises a third tapered bore (143), the third tapered bore (143) being disposed at the tip of the second tapered bore (142).

6. The switchable centerless shaft top clamp fixture according to claim 1, wherein the clamping groove (13) is provided with a fillet (131) for transition at a notch thereof.