JPH0328961Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Technical Field) The present invention relates to an improvement in a drilling machine for drilling into billets using a pair of rolls and a mandrel.

(Prior Art) As shown in FIG. 2, in a punching machine that punches a hole in a billet 3 using a pair of mill rolls 1 and a mandrel 2, the mill roll 1 has conventionally been moved in a direction perpendicular to the line traveling direction. In a mill that moves the mill roll 1 in a perpendicular direction in this way, when the mill roll 1 is tilted at an angle θ toward the entry side when viewed from the material feeding direction and rolled down as shown in FIG. 4, the roll intersection angle θ (the angle between the material pass line and the roll axis) cannot be increased, so it was necessary to increase the distance between the yokes 4 and 4 relative to the width of the mill roll 1. For this reason, the distance between the fulcrums of the roll axis becomes longer,
As the device became larger, it also became a problem in terms of strength. Further, the pressure receiving surface of the pressure receiving portion B of the yoke relative to the bearing 5 of the mill roll 1 was reduced, which caused a problem.

(Problems to be solved by the invention) To solve the above-mentioned problems of the prior art, that is,
To arrange a main frame so that the mill roll does not interfere with a yoke even when the mill roll is rolled down by tilting it toward the entry side, and the pressure receiving area of the pressure receiving part can be sufficiently secured.

(Solution of invention) A pair of yokes are arranged in parallel on a main frame supporting a pair of mill rolls so as to be movable back and forth along the longitudinal direction of the main frame, and a pair of yokes are connected to the pair of yokes via spherical bearings. Along with supporting the mill roll,
Each of the yokes is provided with a drive device that moves the yoke forward and backward, and a pullback device that pulls each yoke backward, and the main frame is tilted at an angle α toward the entry side from a position perpendicular to the direction of movement of the material. Formed.

(Example) An explanation will be given based on FIG. 1. In Figure 1, 6
is a main frame, with the longitudinal direction of the main frame 6 extending in a direction that intersects the direction of material progress, and is bent at an angle α from a position perpendicular to the direction of material progress toward the entry side, forming a dogleg shape. The angle α has a value midway between the maximum and minimum roll crossing angles of the drilling machine (FIG. 3).

The main frame 6 includes a main frame 6
Two parallel yokes 4, 4 are arranged in parallel so that they can move forward and backward along the longitudinal direction of the yokes 4, 4.
A spherical bearing 5 is attached to 4, and the mill roll 1 is pivotally supported by this. A drive device consisting of a screw down screw 7 is provided at the rear end of each of the yokes 4. A yoke center 8 is pivotally supported at the rear end of the yoke 4 via a pin, and a pullback device 9 for pulling the yokes 4 rearward is provided at an intermediate portion of the yoke center.
Therefore, the direction in which the mill roll 1 is rolled down is along the direction of the angle α.

Since the method of rolling down from the direction of the angle α is used, the rolling direction (arrow a in Figure 1) and the pullback direction (arrow b in Figure 1) are also parallel to the main frame 6, that is, at an angle α with the direction of material progress. There is. When applying a rolling force to the material, it is sufficient to move each rolling screw 7 forward by an equal distance in the direction of arrow a, and when it is desired to change the roll intersection angle, move each rolling screw 7 in opposite directions to each other. All you have to do is move it the same distance.

(Effects) As described above, in the present invention, the main frame supporting a pair of mill rolls is formed into a dogleg shape with an angle α inclined toward the entry side from a position perpendicular to the progress of the material, and the mill rolls are aligned along the longitudinal direction of the main frame. Because it is movable, the distance between the yoke and the mill roll can be narrower than before.
The device can be made smaller, and the pressure receiving area of the yoke relative to the bearing of the mill roll can be increased.

Furthermore, by moving the respective yokes in opposite directions, the roll intersection angle can be adjusted, and since the yokes are moved along the main frame, even when the roll intersection angle is adjusted, the roll intersection angle can be adjusted. Misalignment of the mill roll with respect to the mandrel can be minimized.

In addition, since the main frame receives the rolling reaction force from the mill rolls, bearings, and yoke via the rolling screw, it is possible to receive a large reaction force in terms of strength.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a drilling machine according to the present invention, Fig. 2 is a plan view of a conventional drilling machine (the lower half is omitted), and Fig. 3 is a plan view of a conventional drilling machine (the lower half is omitted).
The figure is a plan view when the mill roll is replaced and the mill roll is tilted at an angle θ to the entry side. In the figure, 1... mill roll, 2... mandrel, 3... billet, 4... yoke, 5... bearing, 6... main frame, 7... lowering screw, 8... yoke center, 9... pullback Apparatus, a...downward direction, b...pullback direction.

Claims (1)

[Scope of utility model registration request] A main frame 6 supporting a pair of mill rolls 1 is provided with a pair of yokes 4, 4 arranged in parallel so as to be movable back and forth along the longitudinal direction of the main frame 6, and a spherical bearing 5 is connected to the pair of yokes. The mill roll 1 is pivotally supported by the yoke, and each of the yokes is provided with a drive device for moving the yoke back and forth, and a pullback device for pulling each yoke backward, and the main frame 6 is moved to a position perpendicular to the direction of movement of the material. A drilling machine characterized by being formed in a dogleg shape with an angle α inclined toward the entry side.