JPS59232705A - Expanding mandrel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expanding mandrel that presses the outer surface of a segment against a clamping member of a workpiece.

For example, by arranging segments around a conical tapered member and moving the member relative to the segments in the longitudinal axis direction, the segments are displaced in the radial direction and are brought into IF contact with the cutting surface of the workpiece. Mandrels of this type are already known. In this known mandrel, the segments are independent of each other. The drive of this known mandrel takes place via means specifically provided for this purpose.

There are many shortcomings in this well-known Shinshin, the main ones of which are as follows.

- generally complex in structure and therefore high in cost;

- Being independent of each other, the segments must be relatively long to obtain the necessary cooperation for tightening.

-Shinshin rotation drive system must be installed separately.

The object of the present invention is to provide a mandrel that does not have the above-mentioned drawbacks and is advantageous for mass production.

To this end, the present invention provides a spreading mandrel comprising a body, a pusher consisting of a plurality of segments for tightening the workpiece by varying the diameter, and means for varying the diameter, the body including a forwardly disposed portion. At least two radial protrusions are provided on the curved blade portion of one main body in s 1tI
This is achieved by an expanding mandrel characterized in that a notch is provided at the rear end of each of the segments 1, and the notch cooperates with the protrusion t3fJ to rotate the mandrel.

The expansion mandrel of the invention also has the same number of segments as the protrusions, and the segments are connected to each other in a known manner by bonding a thin layer of rubber or the like to the sides of the segments by hardening or gluing. It is also characterized by

Further features of the invention include a first cylindrical portion, in which the mandrel body, in a known manner, fits at least partially into a corresponding recess formed in the adapter plate for the machine tool towards the mandrel end; A second cylindrical part coaxial with the first cylindrical part, @
a fifth cylindrical part having a coaxial relationship with the second cylindrical part and having the radial protruding part having exactly the same one dimension; a fourth part having a coaxial relationship with the third cylindrical part and tapered in the direction; and a fourth part having an enlarged diameter. It consists of a bush that can be moved in the longitudinal axis direction of the mandrel while remaining in close contact with the taper part of the main body so that the workpiece 1-m is attached to the workpiece 1-m and the workpiece 1-m is tightened with a diameter of 1-m. and all segments have a notch on at least a portion of their trailing ends.

Each of the segments has notches that are arranged at equal intervals and interlock with the projection, and there is a slight operational play between the sides of each notch and each segment.

The height h of the protrusion is also smaller than the height H of the segment.

In such an embodiment, an appropriate stress distribution can be obtained during machining.

The tightening means consists of a rod whose rear end is screwed into the actuating device, and the front end of the rod is equipped with a head that comes into contact with the front end of the segment, and the head has a rearward play by the actuating device approximately equal to jl. It is energized by the distance and moves 'Id+
Button f:1 is driven while moving.

When the crest 7- expands in diameter against the elastic action of the annular return spring and fNIWj such as rubber, the @ segment moves in the longitudinal direction, and the clamping member of the workpiece is pressed against the surface in the radial direction.

That is, when tightening the workpiece, the pusher is provided in a circular groove formed in the WJ layer and the curved surface of the pusher so as to be inclined toward the axis of the mandrel, fP-, against the elastic action of the W-shaped return spring. Expand the diameter. Since the return spring is fitted onto the front surface of the pusher, the return spring is not affected by the outer diameter of the pusher.
It is possible to adapt the bore diameter of the workpiece without disturbing the write-back spring.

The unclamping means pass through a hole formed in a part of the body and consist of a plurality of rods acting on the rear end of the segment, each rod associated with a respective segment, the rod being an integral part of the actuating device. actuated by the curved surface of the flange. said actuator moves forward to untighten the mandrel, and at the same time drives the head and rod t-forward;
The segment is pushed forward and the bushing regains its initial shape under the action of the return spring and the elastic thin film Jω.

Each of the rods, which plays the role of a return button that is a means of unfastening the workpiece, has an annular pad such as rubber fitted into a radial groove formed in each P7 hole in a hole formed in a part of the mandrel body. include.

An annular parallax made of rubber or the like is fitted into a radial groove formed in each rod that acts as a return button, thereby preventing the rod from unintentionally protruding from its receptacle, that is, the hole formed in the mandrel body. can be prevented.

The segments are made of a hard and almost inelastic material.

Other features and advantages will become apparent from the following description and the associated drawings, which illustrate one embodiment of a mandrel according to the invention.

As shown in Figure 1, the machine tool adapter table 1
G is lil to the machine tool by screw 11! 1 is fixed. At least a portion of the first cylindrical portion 11 of the mandrel body 1 doubles in size in the center cutout of the mandrel body 1 . The second cylindrical portion 12 following this first cylindrical portion 11 is the target of the first cylindrical portion 11.
It is coaxial with The diameter of the second cylindrical portion 1□ is the first cylindrical portion 11
smaller than the diameter of The second cylindrical portion 12 is coaxially followed by an M3 cylindrical portion 13 having a smaller diameter. A radial protrusion 14 vi, which acts as a tooth for rotationally driving the mandrel as will be described later, is formed integrally with the third cylindrical portion 13 . The height h (FIG. 2) of this protruding portion 14 is set such that the diameter of a circle corresponding to the diameter of the third cylindrical portion 15 plus the height ht - the length is smaller than the diameter of the second cylindrical portion 120. Set. The third cylindrical portion 13Vc is followed by the tapered portion 15. In the illustrated embodiment, this tapered portion 15 is conical. However, it does not depart from the scope of the present invention even if the tapered portion 15 is formed into a truncated pyramid shape. If the book 2t fitted into this tapered portion 15 is moved to the left (upward in FIG. 1).

The workpiece Pt can be tightened, and the tightening can be unfastened by moving it to the right (upper part of Figure 1).

Push pin 2 consists of the same number of segments as drive teeth 14.

Segment F 21e 2z, 25+ 24* 25
are connected to each other by a thin layer 3 of rubber or the like which is adhered to the side surface of the segment by hardening or contacting. The outer diameter of the bush 2 is the same over its entire length, there is no cut on the outer surface of the pusher 2, the workpiece P is attached to the outer surface of the pusher 2, and the connection between this outer surface and the hole of the workpiece P is Tighten with crimp.

A return spring 4 is provided in the inclined steel groove 12 of the curved surface 2f of the push 7=-2 in order to return the push 2'ft when the tension is released and to maintain the segment in the neutral position.

The length of the push-in is determined by the length of the push-in with the mandrel untightened.
It is set so that there is play jl in the opening between the front end of the conical part 15 and the front end of the conical part 15. As is clear from FIGS. 2 and 4, at the rear end of each segment are notches 21'e, 22'e, and 24Z at regular intervals at the same time as the rotary driving teeth 14 of the mandrel.
25' is provided. The rotation takes place in the direction of arrow f.

There is a play a necessary for operation between the teeth 15 and the rear surface of the cut. As a result, in the case of mass production, the workpieces P can be completely uniformly rolled. segment 2112
2%...25 is a hard material with poor elasticity.
Therefore, it can be formed from a material that is inexpensive and reduces the wear and tear of the segments, which is particularly advantageous for mass production of the workpiece P.

A center hole is formed in the main body 1 so that the rod 5 can slide in the longitudinal direction while closely contacting the wall of the center hole. The rod 5 has a head 51 at its curved end, and the rear surface of the head has a bulge and a sea 2.
Workpiece Pf: is tightened by pushing the pusher to the left (upward in Fig. 1) in cooperation with the front end of Pf.

The intermediate portion 52 of the rod 5 can be slid 11+ while remaining in close contact with the inner wall of the center hole of the main body 1.The rear end 53 of the rod 5 is cut from the center of the table 10 by a distance j3 necessary for tightening or releasing the rod. It is screwed onto an actuating means 7 having a clamp/shift 1 movable within the recess. The curved surface of the club/shifter 1 cooperates with the rear end of the rod 6 inserted into holes arranged concentrically with the center holes formed in the cylindrical portions 11 and 12 of the main body 1 to form a curved end of the rod 6. segment 21,
22° 23, 24+ 25, and release the tightening of the mandrel as described in detail later. Each segment/1
・Make one mouth and one C in succession. Cylindrical portions 11 and 12t of main body 1 - Cylindrical portion 1 of the through holes
A radial groove 13 is formed in each rod 6 at the penetrating portion thereof, and an annular packing 14' made of rubber or the like is attached thereto. The stopper 8'f: is fixed to the main body 1 with the screw 9, and the workpiece P is held against the stopper 7 by its @ surface.
．． Position accurately relative to 2.

The workpiece P is tightened as follows.

Means 7Q that can be controlled by mechanical, hydraulic, electrical means, etc.
The rod 5t is driven in the direction of the arrow fs.

Rod head 51 is pushy 2f! :Same arrow fs
In the direction of play jl, grooves 21/, 22'1. ,・,,
, 25/ and the drive tooth until the play jl and play j5 disappear. Although the play for tightening jl, -j2 and j6 are almost the same, it does not depart from the scope of the present invention even if it is set so that j3≧32>il.
The rod 6, which serves as a return button, is pushed backwards. When moving in the direction of the arrow - while being in close contact with the conical part 15 of the main body 1, the pusher 7 resists the elastic action of the return spring 4 and the thin part 3.
- is increased in diameter, the workpiece P is first gripped, positioned against the rear side of the handle 8 and finally completely tightened. By thus moving the pusher 2 in the direction of the arrow f9, the drive'@ tooth 14 moves into the segment 21+.
22e 2124625 tD cut "j'L 2
2Z 2S/.

・・・・・・25' can be correctly occlusated. As the book #, 1 rotates, the tooth 14 changes to the bush 2 and the workpiece P.
to drive.

To untighten the mandrel, the control device moves the means 7 in the direction of the arrow fd. Under the action of the fly/shift 10, the rod 6 moves to the right by a distance approximately equal to the play j5 (arrow fd
direction). At the same time, the means 7 also move the rod 5 in the direction of the arrow fd, so that the head 51 moves by a distance approximately equal to the play jl. The pusher 2 with the curved blade ' released is pushed in the direction of the arrow f by the rod 6 until the play jl and jl are completely restored.

Under the elastic action of the return spring 4 and the thin layer 3, the outer diameter of the pusher 2 again assumes a neutral value of tightening and releasing. The workpiece P that has been machined is removed, for example, by an automatic mechanism, and a new workpiece P is removed.
is questioned by Putu 7-2.

Various modifications and changes can be made without departing from the scope of the invention. For example, the structure may be such that the workpiece Pi is tightened one rotation not by the shaft hole but by the outer diameter.

In addition, there are two consecutive segments with cutting depth zl, 22s 25...... 21e 22.2B...
It may be configured to span...

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the expanding mandrel according to the present invention, and FIG. 2 is an enlarged Ω diagram of the mandrel taken along the line A-A, 1 in FIG. FIG. 3 is an enlarged cross-sectional view of the mandrel taken along the line B--B in FIG. In fig. 1: Spreading shaft main body 11: First cylindrical portion 12: @2 cylindrical portion 13: Curved blade portion 14: Radial protrusion 15: Tapered portion 2: Push Δ 25: Curved surface 2j+ 22+ 2Ss 24+ 25...・・・
: Segment"1'+22'+ 23Z 24'
+ 25/...: Cutting car 3: Thin layer 4: Annular return spring 6: Rod 12: Circular groove 13: Diameter groove 14: Annular para-command a: Play P: Workpiece

Claims (1)

[Claims] 1. A main body, a push gourd comprising a plurality of segments and tightening a workpiece by changing the diameter, means for changing the diameter, and fcJ! The main body is provided with at least two radial protrusions 14 on the front part 13 of the main body 1 in the spreading mandrel, including the part located at the front, and the segments 21122.23°24.25... Cut 21'L"2'+23'+"4'* at the rear end of each
25'... An expanding mandrel, characterized in that the notches, which are completely provided, cooperate with the protrusion to rotate the mandrel. 2. Segment 2+ 122m"3e241"5...
... are the same number as the protrusions 14, and the R layer 3 made of rubber or the like is joined to the side surface of the segment [-] by hard material or adhesive in a known manner, so that the segments [-] are connected to each other. Spreading mandrel according to claim 1, characterized in that: 3. A first cylindrical part 1 in which the mandrel body 1 fits at least partially in a corresponding recess formed in the adapter plate 10 for the machine tool in a known manner towards the mandrel @ end.
1. 141 Second cylindrical part 12 coaxial with the cylindrical part 11
．． A fifth cylindrical portion 13 having the radial protrusion 14 which is coaxial with the second cylindrical portion 12 and having exactly the same dimension as the second cylindrical portion 12, and a fourth portion 15 which is coaxial with the third cylindrical portion 13 and tapers forward. and a bush 2 which is movable in the longitudinal axis direction of the mandrel while being in close contact with the tapered portion 15 of the main body 1 so as to expand in diameter to tighten the workpiece and to contract in diameter to release the tightening. 2t-tf2 growth segment)
2++22. ．． The number of 15*2s*2s... is the same as SB14, and all segments 21゜22*'' S + 24 s 25...
... has a cut 21'L in at least a part of the rear end
22's25'+"4'+25'..." The spreading mandrel according to claim 941 or 2, characterized in that it has the following: 4. Each of the segments has a notch. , the notches are arranged at equal intervals, and engage with the protrusion 14,
Claim 1 characterized in that there is a slight operational play a between the sides of each cut and each segment.
The spreading mandrel described in any one of paragraphs 6 to 6. 5. Any one of claims 1 to 4 in which the height of the protrusion is smaller than the height H of the segment in a known manner is defined as FF[& The spreading mandrel described in paragraph 1. 6. When tightening the workpiece P, the pusher 2 is moved by an annular return spring 4 provided in a circular groove 12 formed in the thin layer 3 and the curved surface 2f of the plan 2 so as to be inclined toward the axis of the mandrel. The expanding mandrel according to any one of claims 1 to 5, wherein the expanding mandrel expands in diameter against the elastic action of. Z The tightening of the workpiece P is carried out by means of the first cylindrical portion 1.
Claims 1 to 6 include an annular packing 14 made of rubber or the like fitted into semi-flexural grooves 13 formed in each of the rods 16 in the holes thereof. Kaishin Shinshin described in section.