JPH0227044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cross-type inclined rolling mill in which the crossing angle and inclination angle of inclined rolls can be easily adjusted.

[Prior art]

Generally, this type of inclined rolling mill, such as a piercer, is constructed as shown in FIGS. 4 and 5.

FIG. 4 is a schematic plan view of a conventional inclined rolling mill, that is, a rolling mill in which the inclination angle can be freely set;
FIG. 5 is an exploded perspective view showing the configuration of the inclination angle changing means, in which the inclined rolls 1l and 1r are supported on a yoke 2 and a cradle 3 using box-shaped chocks 1a and 1b provided at both ends of the roll shafts. It is arranged in the housing 4 in a state where it is held up. Corner ends of transmission shafts 1c and 1d are connected to one end of the roll shaft, respectively, and are driven to rotate in the same direction by a drive source (not shown). The billet B fed from the direction of the white arrow is bitten between the inclined rolls and is moved in a spiral manner, and the plug 6 supported by the mandrel 5 is penetrated from the tip surface thereof, and the billet B is perforated or stretched/diameter-expanded. It is now being rolled. Incidentally, the support means for the inclined rolls 1l and 1r are chock 1 provided at both ends of the roll shaft as shown in FIG.
a, 1b, a yoke 2 supporting them, a cradle 3, a housing 4, etc. York 2
1a from the four corners of the rectangular base plate 21,
The supports 22a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23a, 23, 23, 23, 23, 4, 4, 3, 4, 4, 3,3, 3
Between a and a, vertical grooves 1e and 1e formed on both sides of the chock 1b are slidably fitted onto the pillars 23a and 23a, and the pillar 22 forming the seat 22
A chock 1a is slidably fitted between a and 23a.

In addition, the yoke 2 itself is provided with vertical grooves 22b, 23b on the outer surfaces of its supports 22a, 23a. Therefore, it can be assembled into the cradle 3.

The cradle 3 is formed in a cylindrical shape with a bottom, and the peripheral wall is removed over a required length at two locations separated by 180 degrees, and is provided with seats 32 and 33 having guide protrusions 32a and 33b for supporting the yoke 2. Although the rear surface of the bottom wall 31 is not shown in the drawing, it is equipped with a shaft in the center, and with the shaft horizontal, the housing 4
It is rotatably supported around an axis as shown by the arrow inside.

When changing the inclination angle of the inclination roll 1l (or 1r), the cradle 3 is rotated within the housing 4 around the axis at the center of its bottom, so that the roll axis is parallel to the pass center of the billet B in plan view. This means that the inclination angle can be changed as appropriate while maintaining the angle of inclination.

Although the above example is a case in which only the adjustment of the inclination angle can be changed, an inclination rolling mill configured to adjust both the inclination angle and the crossing angle was configured as follows. That is, spherical chock is provided at both ends of the roll shaft of the inclined roll in place of the box-shaped chock, and each chock is supported by an individual yoke provided with a spherical seat, and each yoke is arranged as shown in FIG. It is supported on a cradle in a manner similar to that shown in Figure 1, and is constructed by passing through the bottom of the cradle and connecting the rods of hydraulic cylinders to each yoke.

With the above-described configuration, the intersecting angle can be adjusted by individually operating the hydraulic cylinders to move the position of the yoke in the seat of the cradle toward or away from the path center. The angle of inclination is adjusted by rotating the cradle in the same manner as shown in FIGS. 4 and 5.

By the way, the influence of the crossing angle of the inclined rolls in conventional inclined rolling mills on perforation or diameter expansion has not been fully recognized, and in many cases the angle of inclination as shown in Figs. This was a rolling mill that could only be adjusted, but in recent years, as the influence of the intersecting angle of the inclined rolls on perforation or diameter expansion rolling has been recognized, both the inclination angle and the intersecting angle can be adjusted as described above. Inclined rolling mills that have made this possible are beginning to be used. However, modifying a rolling mill that can only adjust the inclination angle as shown in Figs. 4 and 5 so that both the inclination angle and the crossing angle can be adjusted requires changing not only the yoke but also the yoke and cradle.
There was a problem that equipment costs were extremely high.

It should be noted that a configuration as shown in FIG. 6 can be considered as a means for making the inclination rolling mill, which is variable in only the inclination angle, as shown in FIGS. 4 and 5, also variable in the crossing angle at the lowest possible cost. That is, the yoke 3 that supports the yoke 1a, 1b of the inclined roll 1l (or 1r) is a catch plate 23.
The left and right sides of the columns 23, 23a are cut so that the roll axis can be tilted with respect to the columns 23a, 23a that make up the structure, and the columns 23a, 23a are tilted from the state shown by the broken line to the state shown by the solid line. The supports 22a, 2 forming the catch seat 22 are
It is conceivable that a liner 22c, which supports the lower surface of the box-type chock 16 in an inclined state, be fixed between the two a.

However, in such a configuration, the seat 23, which receives thrust force during drilling or diameter expansion rolling, is cut to be in an inclined state as described above, resulting in a decrease in strength and a problem in that sufficient supporting force cannot be obtained. There is also an inclined roll 1l (1
There were problems such as the attachment and detachment of item r) was difficult and required a special jig.

〔the purpose〕

The present invention has been made in view of the above circumstances, and its object is to provide an inclined rolling system in which only the inclination angle can be adjusted by improving the connection between the inclined roll and the yoke that supports it. To provide a cross-type inclined rolling mill configured so that the cross angle can be adjusted at low cost.

〔composition〕

The cross-type inclined rolling mill according to the present invention has a cradle in which the inclined roll shaft is mounted on a yoke using chock provided at both ends thereof, and the yoke is rotatable around an axis perpendicular to the pass center of the workpiece material. In a cross-type inclined rolling mill in which the inclined roll shaft is held in place, the chock at one end of the inclined roll shaft is constituted by a chock having a spherical surface on the outer peripheral surface, and this chock is supported by the yoke so as to be able to change direction. The chock at the other end is supported within the seat of the yoke so that it can be adjusted to move near or far from the pass center in order to vary the intersecting angle of the tilted roll axis with respect to the pass center, and the roll axis is set between the chock and the seat of the yoke. It is characterized by having a pedestal that is held in position removably fixed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a schematic plan view of an inclined rolling mill according to the present invention, in which 1l and 1r are inclined rolls, 8 is a yoke, 3 is a cradle, 4 is a housing, 5 is a mandrel, and 6 is a plug. There is. One end in the axial direction of the inclined rolls 1l, 1r is connected to a transmission shaft 1c, 1d via a coupling, and each transmission shaft 1c, 1d is further connected to a reducer 7 via a coupling, and a drive (not shown) is connected to the transmission shaft 1c, 1d. The two are rotated in the same direction around the axis by the source. Further, the plug 6 is attached to the tip of the mandrel 5 and the inclined rolls 1l, 1
It is located between r. The billet B, which is the raw material, is fed to the punching machine from the white arrow mark, and is bitten between the inclined rolls 1l and 1r.
r, it is rotated around the axis line and moved in the axial direction, so-called spiral movement, and the plug 2 is penetrated from the tip along the axis line, and piercing rolling is performed. It is now formed into a raw pipe.

Each of the inclined rolls 1l and 1r is mounted on an axis in such a manner that its inclination angle and intersecting angle can be adjusted, but since both are substantially the same in structure, the support structure of the inclined roll 1l will be explained below. . FIG. 2 is a partially cutaway plan view showing the support structure for the inclined roll 1l, and FIG. 3 is an exploded perspective view of the inclined roll 1l. Each has an inlet surface 1h and an outlet surface 1i each having a truncated conical shape. Chocks 1j and 1 are provided at both ends of the roll axis of the inclined roll 1l, respectively.
The yoke 8 is supported by the cradle 3. The yoke 8 is supported by the cradle 3. Chiyotsuk 1k has 1 neck bearing inside.
The chock 1j is also comprised of a box-shaped chock having a neck bearing 1n inside, and the chock 1k is located inside the spherical seat 83 of the yoke 8. Similarly, the yoke 1j is fitted into a rectangular seat 82 of the yoke 8, respectively.

The yoke 8 is provided with a hemispherical catch seat 83 on one side along both edges in the longitudinal direction of a rectangular base plate 81, and a pedestal 84 for giving an inclination to the roll axis is removably attached to the other side. The catch seat 83 is provided with a retainer 83e formed on the half-sphere surface constituting the catch seat 83, and is removably screwed to the catch seat 83. Stop plate 8
2e is also removably screwed. The pedestal 84 is plate-shaped, and is formed so that the wall thickness becomes thinner from one edge side to the opposite side edge side, and the edge on the thinner side is located outside of the catch seat 82. It is removably fixed to the inner inner wall of the seat 82 with a set screw 84a. Various types of pedestal 84 are available with different inclination angles depending on changes in wall thickness, and the pedestal 84 is appropriately selected and used depending on the intersection angle to be set.

Concave grooves 82b and 83b are formed on the outer peripheral surface of each seat 82 and 83 of the yoke 8.
Guide protrusion 32 of cradle 3 at b, 83b
a, 33b. The structure of the cradle 3 is substantially the same as that of the cradle 3 shown in FIGS. 4 and 5 described above.

In the product of the present invention constructed as described above, the angle of inclination can be changed by rotating the cradle 3.
Further, the crossing angle can be changed by rotating the spherical chock 1k provided at one end of the roll shaft of the inclined roll 1l (1r) within the spherical catch 83 to maintain the roll shaft at a predetermined angle according to the tendency of the roll shaft. Pedestal 8 required for
4 in the seat 82, the angle of the roll axis, in other words, the intersecting angle of the inclined rolls can be arbitrarily set.

If you want to further change the intersection angle, use the retaining plate 8.
2c, move the chock 1j in the direction in which it comes out of the catch 82, and replace the pedestal 84.
What is necessary is to push the chock 1j into the catch seat 82 again and fix the retaining plate 82c.

〔effect〕

As described above, with the product of the present invention, a low-cost incline rolling mill in which only the inclination angle can be changed can be constructed so that not only the inclination angle but also the crossing angle can be changed at will by simply repairing the yoke and chock. The present invention has excellent effects such as being able to do the following.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of the product of the present invention, FIG. 2 is an enlarged plan view, FIG. 3 is an exploded perspective view showing the support structure of the inclined roll, and FIG. 4 is a schematic plan view of the conventional product. FIG. 5 is an exploded perspective view showing the support structure of the inclined rolls, and FIG. 6 is an explanatory diagram showing an example in which the inclined rolling mill shown in FIGS. 4 and 5, in which only the inclination angle is variable, is modified to have a variable intersecting angle. 1l, 1r... inclined roll, 1a, 1b... chock, 1c... concave groove, 3... cradle, 4...
... Housing, 5 ... Mandrel bar, 6 ... Plug, 8 ... Yoke, 81 ... Base plate, 82, 83
...Catch, 84...Pedestal.

Claims (1)

[Claims] 1. In a cross-type inclined rolling mill in which an inclined roll shaft is mounted on a yoke using jocks provided at both ends thereof, and the yoke is held in a cradle that is rotatable around an axis perpendicular to the pass center of the workpiece material. The chock at one end of the tilted roll shaft is constituted by a chock having a spherical surface on the outer circumferential surface, and is supported by a yoke so as to be able to change direction, and the chock at the other end of the tilted roll shaft is disposed within a seat of the yoke. ,
In order to make the intersecting angle of the inclined roll axis with respect to the pass center variable, the pass center is supported so as to be adjustable in distance and distance, and a pedestal for holding the roll axis at a set position is removably fixed between the chock and the seat of the yoke. A cross-type inclined rolling mill characterized by the following.