CN211638366U

CN211638366U - Clearance-eliminating tensioning mandrel

Info

Publication number: CN211638366U
Application number: CN201922063237.5U
Authority: CN
Inventors: 陈超
Original assignee: Changzhou South Drive Technology Co ltd
Current assignee: Changzhou South Drive Technology Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-10-09
Anticipated expiration: 2029-11-26

Abstract

The utility model relates to the technical field of workpiece processing and fixing devices, in particular to a clearance eliminating tensioning mandrel, which comprises a mandrel body, wherein the left end of the mandrel body is a fixing excircle of a striking device, the left end surface of the fixing excircle of the striking device is provided with a first central hole, the right end surface of the fixing excircle of the striking device is provided with a transition excircle, the diameter of the transition excircle is smaller than that of the fixing excircle of the striking device to form a positioning shoulder blade surface, the right end surface of the transition excircle is sequentially provided with a taper excircle and a screw rod, the right end surface of the screw rod is provided with a second central hole, an elastic expansion sleeve is sleeved on the taper excircle, the right end of the elastic expansion sleeve is compressed and fixed through a pressing plate and a nut, the utility model has the beneficial effects that the elastic expansion sleeve can be subjected to left acting force under the compression action of the nut, and then generates elastic deformation under the action of the taper excircle, the concentricity of the inner hole and the outer circle of the workpiece after machining is ensured to be good.

Description

Clearance-eliminating tensioning mandrel

Technical Field

The utility model belongs to the technical field of the work piece processing fixing device technique and specifically relates to a crack tight dabber that rises disappears.

Background

In the machining and manufacturing of the planetary gear, a mandrel is generally matched according to the size of an inner hole of a workpiece, and in the prior art, the positioning size generally keeps a gap in combination with the length of the workpiece. The longer the registration size, the larger the required fit clearance. The larger the fit clearance is, the less ideal the concentricity between the outer circle and the inner hole of the machined part is. However, in consideration of the problem of convenience in disassembly and assembly, the clearance of the mandrel needs to be reserved, so that the concentricity of the finished workpiece is poor.

SUMMERY OF THE UTILITY MODEL

In order to overcome the poor not enough of work piece finished product concentricity that current dabber clearance caused, the utility model provides a crack tight dabber that rises disappears.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a clearance that disappears rises and tightly dabber, contains the dabber body, dabber body left end is the fixed excircle of striking gear, the left end face of the fixed excircle of striking gear is provided with centre bore one, and the right-hand member face of the fixed excircle of striking gear is provided with the transition excircle, the diameter of transition excircle is less than the fixed excircle of striking gear and forms the location shoulder blade, transition excircle right-hand member sets gradually tapering excircle and screw rod, screw rod right-hand member is provided with centre bore two, the elasticity cover that rises is established to taper excircle department cover, elasticity cover right-hand member that rises compresses tightly fixedly through clamp plate and nut, the nut links to each other with the screw rod screw thread.

According to the utility model discloses a further embodiment, further include, the elasticity cover that rises sets up the interior awl with tapering excircle complex. The tensioning performance of the elastic expansion sleeve is ensured.

According to the utility model discloses a further embodiment, further include, the elasticity rises set outer wall and is seted up slottedly.

According to the utility model discloses a further embodiment, further include, the quantity in groove is at least two sets of, further improves the tight performance that rises of elasticity cover that rises.

According to another embodiment of the present invention, further comprising, the nut is a shoulder nut. Further improving the compression stability of the nut.

The beneficial effects of the utility model are that, under the nut compresses tightly the effect, can make elasticity rise the cover and receive effort left, elasticity rises the cover and produces elastic deformation under the effect of tapering excircle, eliminates positioning gap to make work piece and elasticity rise and do not have fit clearance between the cover, guarantee to process that the concentricity condition of accomplishing back work piece hole and excircle is good.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the present invention;

FIG. 3 is a schematic view of a mandrel body construction;

FIG. 4 is a schematic view of the present invention in use;

fig. 5 is a schematic view of the structure of the elastic expansion sleeve.

In the drawing, 1, a mandrel body, 2, a shifting device fixing excircle, 3, a center hole I, 4, a transition excircle, 4-1, a positioning shoulder blade, 5, a taper excircle, 6, a screw, 7, a center hole II, 8, an elastic expansion sleeve, 8-1, an inner conical surface, 8-2, a groove, 9, a pressing plate, 10, a nut, 11, a workpiece, 12 and a shifting clamp are included.

Detailed Description

Fig. 1 to 3 are the utility model discloses a structural schematic diagram, a clearance that disappears rises and tightly dabber contains dabber body 1, 1 left end of dabber body is the fixed excircle 2 of shifter, the left end face of the fixed excircle 2 of shifter is provided with centre bore one 3, and the right-hand member face of the fixed excircle 2 of shifter is provided with transition excircle 4, the diameter of transition excircle 4 is less than the fixed excircle 2 of shifter and forms location shoulder blade 4-1, 4 right-hand members of transition excircle set gradually tapering excircle 5 and

screw rod

6, 6 right-hand members of screw rod are provided with centre bore two 7, the elasticity cover 8 that rises is established to 5 covers of tapering excircle, the elasticity cover 8 right-hand members that rises compresses tightly fixedly through clamp plate 9 and nut 10, nut 10 links to each other with 6 screw threads of screw rod.

In the application, a center hole I3 and a center hole II 7 at two ends of a mandrel body 1 of the backlash eliminating tensioning mandrel are respectively connected with a machine tool spindle center and a tailstock center to form a two-top clamping mode, as shown in figure 4, a toggle clamp 12 is sleeved at a fixed excircle 2 of a toggle device to drive the backlash eliminating tensioning mandrel to do rotary motion, meanwhile, the fixed excircle 2 of the toggle device has a certain length to avoid interference, an inner hole of a workpiece 11 is matched with an elastic tensioning sleeve 8, the left end face of the workpiece 11 is tightly propped against a positioning shoulder blade face 4-1, a pressing plate 9 and a nut 10 are used for tightly pressing and fixing the elastic tensioning sleeve 8, the elastic tensioning sleeve 8 can be subjected to leftward acting force under the pressing action of the nut 10, the elastic tensioning sleeve 8 is sleeved under the action of a taper excircle 5 to generate elastic deformation and eliminate a positioning gap, so that no fit gap exists between the workpiece 11 and the elastic tensioning sleeve 8, the concentricity of the inner hole and the outer circle of the workpiece 11 after the machining is finished is ensured to be good. When the workpiece 11 is dismantled, the workpiece 11 can be taken down only by screwing down the nut 10 and removing the elastic expansion sleeve 8. The concentricity of the workpiece 11 machined by the tool is easy to guarantee.

According to another embodiment of the present invention, further comprising that the elastic expansion sleeve 8 is provided with an inner conical surface 8-1 cooperating with the taper outer circle 5. The tensioning performance of the elastic expansion sleeve 8 is ensured.

According to another embodiment of the present invention, it further comprises that the outer wall of the elastic expansion sleeve 8 is provided with a groove 8-2, as shown in fig. 5.

According to the utility model discloses a further embodiment, further include, the quantity of groove 8-2 is at least two sets ofly, further improves the tight performance that rises of elasticity cover 8 that rises.

According to another embodiment of the present invention, it is further included that the nut 10 is a shoulder nut. Further improving the pressing smoothness of the nut 10.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A clearance-eliminating tensioning mandrel comprises a mandrel body (1) and is characterized in that the left end of the mandrel body (1) is provided with a fixed excircle (2) of a shifting device, the left end face of the fixed excircle (2) of the shifting device is provided with a first central hole (3), the right end face of the fixed excircle (2) of the shifting device is provided with a transition excircle (4), the diameter of the transition excircle (4) is smaller than that of the fixing excircle (2) of the toggle device to form a positioning shoulder blade surface (4-1), the right end of the transition excircle (4) is sequentially provided with a taper excircle (5) and a screw (6), a second central hole (7) is formed in the right end face of the screw rod (6), an elastic expansion sleeve (8) is sleeved at the taper excircle (5), the right end of the elastic expansion sleeve (8) is compressed and fixed through a pressing plate (9) and a nut (10), and the nut (10) is in threaded connection with the screw (6).

2. The clearance-eliminating tensioning mandrel as claimed in claim 1, wherein the elastic expansion sleeve (8) is provided with an inner conical surface (8-1) which is matched with the tapered outer circle (5).

3. The anti-backlash tensioning mandrel as claimed in claim 1 or 2, wherein the outer wall of the elastic expansion sleeve (8) is provided with a groove (8-2).

4. A backlash-eliminating tensioning mandrel as claimed in claim 3, characterized in that the number of grooves (8-2) is at least two.

5. The anti-backlash tensioning mandrel as claimed in claim 1, wherein the nut (10) is a shoulder nut.