JPS6171141A - Center roll device of annular metal rolling mill - Google Patents

Abstract

PURPOSE:To improve a rolling quality of an annular product by making a shaft center line of a center roll cross a shaft center line of a main roll at a prescribed angle. CONSTITUTION:A chock 5 is supported pivotally by a working table 7 on a vertical axis of the center of a center roll 2. A worm wheel 12 is provided on the end part on the chock 5, and also a worm 13 and its driving means 14 are fixed and placed on the working table 7. The worm 13 is rotated by the driving means 14, and the chock 5 is turned together with the worm wheel 12 to the minute extent through a center pin 8. By this mechanism a shaft center line of the center roll 2 is made to cross the center line of a shaft 3' of a main roll 3 at a prescribed angle. Accordingly, rolling between the center roll 2 and the main roll 3 is equalized in each part, and a rolling quality of an annular product whose inside periphery or outside periphery is tapered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a center roll device of a circular metal rolling mill for producing inner and outer rings of a tapered roller bearing, and other circular metal products, in which the thicknesses of both end portions of a cylindrical shape are different. 〇Prior art related to Figs. 7, 8 and 9, a pair of inclined split rolls 41 as main rolls are mounted on a fixed frame (not shown), and the actuating tape A1 has a lifting means 52.
A bearing stand 46 is installed on the bearing 50. 54 is a clamp for fixing the bearing stand 46.

The pair of inclined split rolls 41 are formed and arranged so as to roll the outer circumference and both side surfaces of the annular material 43.

The center roll 42 corresponds to the shape of the inner periphery of the annular material 43 after rolling and is formed into a tapered shape as shown in FIG. Each part of the center roll has the same diameter.

The annular material 43 is fitted into the hole in the center row/I/42, and the actuating tape A150 is raised in a controlled manner to roll the inner peripheral portion of the annular material 43.

One end of the shaft of the center roll 42 is supported by a cantilever on a bearing stand 46, and the other end is rotatably supported by a movable frame 49, and rotates as a result of rotation when the *-shaped material is rolled by the main roll. When the rolling of the annular material is completed, only the movable frame 49 is retracted in the direction of the arrow, and the rolled annular product is taken out from the center roll 42.

Behind the center roll 42, a group of outer diameter forcing rolls 44 is arranged to determine the outer diameter of the annular material 43 after rolling. The holder 44a that pivotally supports the outer diameter forced roll 44 is 1
It is slidably supported by radial lines 11145 provided on the wall of the bearing stand 46. A bolt 48 fixes the holder 44& to a long hole 51 formed along the radial groove 45.

The head of the retaining bolt 47 screwed into the holder 44 & is brought into contact with the bearing stand 46 to regulate the position of the outer diameter forcing roll 44 .

Problems to be Solved by the Invention As shown in FIG. 9, the center line of the axis of the inclined split roll 41, which is the main roll, and the center line of the axis of the center roll 42 are parallel,
If the inner circumference of the rolled annular material is tapered as shown in the figure,
The rolling force of the center row/I/42 acting on the annular material 43 is not uniform at both ends of the annular material 43. As a result, the internal parts of the annular material are rolled non-uniformly, resulting in non-uniform rolling of the internal structure and occurrence of rolling burrs at the edges with excess thickness such as poultry meat or uneven thickness.

These problems occur not only in the case of the outer ring of the tapered bearing shown in the figure, but also in products with a tapered outer periphery and the same inner diameter.As a result, if only the internal structure of the product is non-uniform, A problem arises in that the shape of the piston cannot be accurately formed by rolling.

In view of this, the present invention intersects the center line of the shaft of the center roll at a predetermined angle with the center line of the shaft of the main roll that presses the outer part and both side surfaces of the annular material.
It is an object of the present invention to provide an apparatus capable of uniformly rolling a ring-shaped material at each part. It also makes it easier to adjust the device.
The purpose of this document is to be constructed in such a way that it can be carried out accurately.

Means for Solving the Problems In FIGS. 1, 2, and 3, the center roll 2 is moved along the vertical axis corresponding to the vertical axis below the center of the center roll 2 that rolls the inner part of the annular material l. Pivotally supported bearing stand 5
is pivotally connected to the operating table 7 by a pin 8, and the bearing stand 5 is made rotatable.

The present invention is also characterized in that the bearing stand 5 is rotatable on the operating table 7 about the pin 8, and is provided with a driving means 14 for controlling the rotation. The center line of the center row/I/2 axis is aligned with the axis 3' of the main roll 3.
can intersect the center line at an angle θ shown in FIG. 3, for example, so that the rolling force is applied as uniformly as possible to each part of the annular material to be rolled by the center roll 2 and the main roll 3MO.

Further, since the worm 13 is rotated by the driving means 14 and the bearing stand 5 can be rotated together with the worm wheel 12 to a minute degree in the direction of the arrow in the figure about the 1 center pin 8, the angle θ can be easily adjusted. Accurate.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 1 and 3. A bearing stand 5 is placed on an operating table 7 having a lifting means (not shown), and an S movable frame 18 is designed to retreat above the bearing stand 5 in the direction of the arrow in the figure. 17 is a guide post for moving the operating table 7 up and down, and 116 is a clamp for fixing the bearing stand 5.

A pair of inclined portions @a-rules 3 are fixed to the tips of respective drive shafts 3' rotating on intersecting # lines, and the drive shafts are supported by a fixed frame (not shown) and connected to a drive source.

Both ends of the shaft of the center roll 2, which is passed through a hole in the annular material 1 to roll the inner circumference, are supported by the bearing stand 5 and seven movable frames 1gK, respectively, as in the prior art.

Behind the central four-wheel 2, a group of four outer diameter force rolls that come into contact with the outer circumference of the 1W4-shaped material 1 and determine the outer diameter of the annular material 1 are arranged, and a holder 4a that pivotally supports the outer diameter force roll 4.
is slidably supported in a radial groove 5a formed inside the bearing stand 5.

The length of the retainer bolt 6 screwed into the holder 4& is adjusted and brought into contact with the bottom of the bearing stand 5.

The holder 4 & has a long hole 5 formed in the radial groove 5 &
It is fixed to the υ bearing stand 5 by the pin 11 that penetrates through b.

In the present invention, a center pin 8 is used as K for pivotally supporting the bearing stand 5 to the table 7 on the vertical axis of the center of the center roll 2. Reference numerals 9 and 10 are shaft holes for center pins in the bearing stand 5 and table 7.

A worm wheel 12 is fixed to the end of the bearing stand 5, a worm 13 for the worm wheel 12, and a driving means 14 such as a motor with a speed reducer connected to the worm 13 are fixed to the upper end of the operating table 7, respectively. has been done. 15 is a cover In FIGS. 4, 5, and 6 showing the second embodiment of the present invention, the same reference numerals are used for the same parts as in the first embodiment. The main roll is configured such that the annular rolling roll 20 and side rolling rolls 21 and 22 correspond to the outer peripheral shape of the annular material 1 after rolling, and can be separated into a driving shaft 23 and a driven shaft 24, which rotate on the same axis. Consists of a combined structure.

Reference numeral 25 denotes a drive device for the roll device, and the side rolling roll 21 is moved forward and backward in the direction of the arrow in the 9% diagram by an advance/retreat device 26 (the drive device 25 and the advance/retreat device 26 are attached to the upper frame 27). It is being

The center roll 2 and the bearing stand 5 supporting it are constructed in the same manner as in the first embodiment, and the axis of one center roll 2 is designed to intersect with the axis of the main roll at an angle θ.

Of course, in the above embodiment, a handle with a scale display may be provided in order to quantitatively rotate the bearing stand 5.

Effects of the Invention According to the present invention, the intersection angle of the center lines of the respective axes of the main roll and the center roll can be easily adjusted to vIi.
In addition, since the above-mentioned crossing angle can be easily and accurately adjusted by the drive device and the control device, it is possible to roll annular products with tapered inner or outer circumferences under high quality control. 0

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a plan view thereof, and Fig. 4 is a sectional view of a main part showing another embodiment. FIG. 6 is a plan view showing the state in operation. FIGS. 7 and 8 are sectional views showing a conventional example, and FIG. 9 is a plan view thereof. l... Annular material, 2... Center roll, 3... Inclined split roll, 4... Outer diameter forced roll, 5... Bearing stand, 7... Operating table, 8... Center pin, 12
...worm wheel, 13...worm, IB・
...Movable frame, 20...Annular rolling roll, 21.
22...Side rolling whirl Applicant Koyo Seio Co., Ltd.' Figure 1 Figure 2 Figure 3 rjJ Figure 4 Figure 5 ri! J Figure 6

Claims (2)

[Claims] (1) In an annular metal rolling mill that is equipped with a main roll, a center roll, and a group of forced outer diameter rolls, and in which the axis of the center roll is supported on a bearing stand on an operating table and a movable frame, the bearing stand is A center roll device for an annular metal rolling mill, characterized in that the center roll is pivotally supported on the operating table at the center vertical line of the center roll, so that the axis of the center roll can intersect with the axis of the main roll. (2) A center roll device for a circular metal rolling mill according to claim 1, wherein the amount of rotation of the bearing stand on the operating table is controlled by a driving means.