JPH0468056B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary roll forming machine, and particularly to a rotary roll forming machine suitable for pulley forming.

[Conventional technology]

The conventional device, as described in JP-A-53-63263, fixes a cylindrical material to the chuck body (rotary receiver type), and uses a rotating roller for inner forming and a rotating roller for V-groove forming to form a V-groove pulley made of steel plate. It began to form. However, no consideration was given to forming the outer circumferential groove using only the rotating roller for forming the V-groove.

Furthermore, a technique for forming a V-groove on the outer periphery of a material by rotating a forming roller is also known from Japanese Patent Application Laid-Open No. 60-64739. No consideration is given to eliminating the molding rotary roller and forming the outer circumferential groove using only the forming rotary roller.

[Problems to be Solved by the Invention] The above-mentioned conventional technology eliminates the back-up roller that receives forming pressure when forming grooves on the outer periphery of a disc material by cold rolling, and forms outer circumferential grooves only using forming rotating rollers. No consideration was given to the formation of a molded product, and the molding mechanism was complicated, making it difficult to improve the molding accuracy of the finished product.

In addition, there was a problem that the process from chucking the material to releasing it was complicated and the molding speed was slow.

An object of the present invention is to provide a rotary roll forming machine with an extremely simple forming mechanism and high forming accuracy.

[Means for solving problems]

The above object is to provide a tail stock that is held and fixed to a base and has a hollow part, a piston body that is supported in the hollow part of the tail stock so as to be able to reciprocate, and a driven side that is rotatably supported in the hollow part of the piston body. This is achieved by forming a chuck device with a rotating shaft and a chuck fixed to one end of the rotating shaft.

[Effect]

When the drive shaft is rotated, the hollow material held by the chuck main body and the driven chuck rotates via the mandrel, and a groove is formed on the outer periphery of the material by a shaping transfer roller that is pressed from the outer periphery.
The driven side chuck is supported by the tail stock through the piston body, and the hollow material is attached to and removed from the chuck by the reciprocating movement of the piston. During product processing, the driven side rotating shaft is pressed together with the piston body, and the driven shaft is pressed against the drive shaft. Rotates synchronously and driven.

On the other hand, the driven side rotating shaft slides on the tail stock via a piston, and since there is little protruding outward from the end surface of the tail stock, stable centering accuracy can be achieved even if shaping roller pressure is applied from only one direction. It will rotate. Therefore, products with high dimensional accuracy can be obtained by cold rotary roll forming.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Fig. 2 shows the top external appearance of the rotary roll forming machine, in which the spindle head 2 shown in detail in Fig. 3 is arranged and fixed on the top surface of the base 1, and the tail stock shown in detail in Fig. 1 is mounted on the opposite surface. 3 is fixed in position. This tail stock applies back pressure to the workpiece attached to the chuck to properly hold the workpiece.It is placed opposite the spindle head 2 on the drive shaft side, and the driven side chuck 31 is also attached to the drive side. It is arranged facing the chuck main body 21 on the same axis.

On the other hand, the rolling device 4 that shapes the workpiece is
The chucks 21 and 31 are arranged and fixed at positions perpendicular to their axial directions. Further, a speed reducer 22 is arranged behind the spindle head 2, and is connected to the drive motor 5 installed in parallel via a belt or the like.

The spindle head 2 shown in FIG. 3 is commonly used, and is equipped with a drive shaft 25 having a chuck body 21 fixed at its tip and a rod 24 for operating an eject pin 23 in the center. 25 is rotationally driven via a reduction gear 22, and the rod 24 is operated by an ejector cylinder 26 which is hydraulically driven.

Next, the tail stock device, which is the main part of the present invention, will be explained with reference to FIG. A hollow piston body 33 is inserted into the hollow portion 32 of the hollow tail stock 3 so as to be able to reciprocate, and an operating shaft 34 is fixed to the rear end with a bolt 34a, thereby forming a first hydraulic chamber 35. There is. Further, the rear of the operating shaft 34 is supported by a T-tube flange 36 fixed to the rear end surface of the tail stock 3 with bolts 36a, forming a second hydraulic chamber 37. Of course, the open end of the second hydraulic chamber 37 is hermetically closed by a lid 38, which supports the rear end of the operating shaft 34. Note that 3a is a main feed operating passage of the piston body 33 that communicates with the first hydraulic chamber 35, 38a is a rapid feed operating passage of the piston body 33 that communicates with the second hydraulic chamber 37, and 38b is fixed on the operating shaft 34. Third hydraulic chamber 3 formed by partition ring 34b
This is a piston body return operation passage communicating with 7a.

Next, a driven rotating shaft 40 disposed in the hollow part 39 of the piston body 33 is supported via a radial bearing 41 on the opening side of the hollow part 39, and supported via a thrust bearing 42 and a taper bearing 43 at the rear. Movement in the axial direction is prevented by stepped surfaces formed on the inner diameter surface of the piston body and the outer diameter of the rotating shaft, and the open end is held by a press plate 45. Furthermore, the driven side rotating shaft 4
A driven side chuck 31 made of die steel and having a hollow portion 46 is fixed to the end face of the shaft 0 with a bolt 47. In addition, in FIG. 1, the piston body 33
The outer circumferential distance 2D of the piston main body in contact with the tail stock 3 during maximum movement is approximately twice that of the piston main body D, and the support range 2d of the driven side rotating shaft supported by the piston main body 33 is the same as that of the rotating shaft 40.
The piston body 33 is designed to be approximately twice as large as the base of the rotary shaft 40 and the piston body 33 to increase rigidity and to minimize the portions of the rotating shaft 40 and the piston body 33 that protrude to the outside.

As shown in FIG. 4, the rolling device 4 has a fork portion 4a at its tip that supports a shaping rotation roller 48, and the roller 48 is rotatably supported on the fork portion 4a via a support pin 49. There is. Note that 50 is a mandrel.

In the above structure, if the hollow material W is explained using FIG. It is held by a chuck 31. At this time, the mandrel 50 is fitted into the hollow portion 46 of the driven chuck 31, and positioning between the two is performed. Next, the pressure in the first hydraulic chamber 35 is increased, and the driven chuck 31 is strongly pressed together with the piston body 33, completely chucking the hollow material W.

When the drive motor 5 shown in FIG. 2 is driven while maintaining this state, the hollow material W also begins to rotate. Therefore, the shaping rotary roller 48 of the rolling device 4 is advanced only in one direction and is pressed against the outer periphery of the hollow material W to form a groove of the required shape by cold rolling. When the molding is completed, the internal pressure of the third hydraulic chamber 37a is increased to return the piston body 33 and the driven chuck 31, and the molded product is removed from the mandrel 50 using the edge pin to complete the work.

During this series of molding operations, the driven side rotating shaft 40, which is rotatably arranged, is supported by the tail stock 3 via the hollow piston body 33, so it has extremely high rigidity, and is more rigid than the tail stock 3. By making the externally protruding part as short as possible, the hollow material will not run out even if forming pressure is applied to the chuck device from only one direction, and as a result, highly accurate grooved molded products can be cold rolled. This further improves molding speed. Furthermore, unlike the conventional method, a special backup roller is not required, so the device itself is simple and maintenance is also advantageous.

Note that the groove shape itself is arbitrarily determined depending on the product to be molded, such as a poly V pulley, a V pulley, or a gear.

〔Effect of the invention〕

As described above, according to the present invention, a rotary roll forming machine with an extremely simple forming mechanism and high forming accuracy is provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary roll forming machine of the present invention, and FIG. 1 is a half-longitudinal sectional view of the tail stock device, FIG. 2 is a top view, FIG. 3 is a half-longitudinal sectional view of the spindle head, and FIG. 4 is a half-longitudinal sectional view of the spindle head. is an enlarged sectional view of the main part of FIG. 2; 1...Base, 2...Tail stock, 31...
... Driven side chuck, 33 ... Piston body, 40
...Driver side rotating shaft.

Claims (1)

[Scope of Claims] 1. A drive shaft rotatably held and fixed to a spindle head fixed to a base and having a chuck body fixed to one end thereof, a tail stock fixed to the base facing the chuck body, and a driven chuck device rotatably held and fixed on the same rotation axis, the driven chuck device comprising: a tail stock held and fixed to a base and having a hollow portion; The piston body is comprised of a piston body that is reciprocatably supported in a hollow part, a driven rotating shaft that is rotatably supported in the hollow part of the piston body, and a chuck that is fixed to one end of the rotating shaft. Characteristic rotary roll forming machine. 2. In claim 1, the outer circumferential distance of the piston body in contact with the tail stock at the time of maximum movement of the piston body is approximately twice the diameter of the piston body, and the driven side rotation shaft supported by the piston body A rotary roll forming machine characterized in that a support range of the rotary shaft is approximately twice that of the base of the rotary shaft.