JPS6116885Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pusher head for an inclined rolling mill.

As shown in FIG. 1, for example, as shown in FIG. 1, a material 2 is rotated and moved by an inclined rolling mill 1, and its outer diameter is There is a so-called Mannesmann type drilling method in which drilling is performed using the plug 3 while reducing the amount of damage.

In this case, the pusher head of the pusher 4, which presses the end of the material 2 until it is bitten by the inclined rolling mill 1, has conventionally been designed as shown in FIG. That is, a pusher head 7 is attached to the tip of a ram head 6 fixed to the tip of the ram 5. The rear end of the pusher head 7 is formed into a spherical shape, and is loosely fitted to the tip of the ram head 6. Since the pusher head 7 is attached to the ram head 6 in this manner, the rotational force acting on the pusher head 7 is not directly transmitted to the ram 5. As a result, since no large rotational force is applied to the ram 5, the diameter of the elongated ram 5 can be made small, thereby reducing the weight of the ram 5 and equipment costs.

However, when the end of the material 2 is pressed by the pusher head 7 until the material 2 is bitten into the inclined rolling mill 1, the material 2 is bitted into the inclined rolling mill 1 and simultaneously rotates. The pusher head 7 that is in contact with the rotating material 2 is solid and has considerable weight, so even though the pusher head 7 is rotatable around its axis, the material 2 immediately
It does not rotate together with the material 2, and therefore friction occurs on the contact surface with the material 2. For this purpose, the pusher head 7
As a result of abrasion occurring on the contact surface between the pusher head 7 and the material 2, or damage to the neck portion 7' of the pusher head 7, the pusher head 7 had to be replaced frequently.

This invention was devised to solve the above-mentioned problems, and is characterized in that a short tubular pressing member with a bottom is attached to the tip of the pusher head body so as to be rotatable around its axis.

This invention will be explained by way of examples with reference to the drawings.

FIG. 3 is a sectional view of a main part of the pusher head of this invention.

In Fig. 3, 8 is the pusher head body;
Reference numeral 9 designates a bottomed short tubular pressing member (hereinafter simply referred to as pressing member) which is attached to the tip of the pusher head body 8 via a bearing so as to be rotatable around its axis as described later. The tubing material is abutted. The outer diameter of the tip 8' of the pusher head body 8 is smaller than the outer diameter of the pusher head body 8, and a pressing member 9 having the same diameter as the pusher head body 8 is attached to this portion via a radial bearing 10 and a thrust bearing 11. is mounted rotatably around its axis. A greasing port 12 is formed in the pusher head body 8, from which a lubricant such as grease is supplied to the bearings 10 and 11 through a groove 13, so that smooth rotation of the pressing member 9 can be maintained. . The contact portion between the pusher head body 8 and the pressing member 9 is sealed by a labyrinth seal 14. The pusher head body 8 and the ram 5 are integrally connected in the same manner as the ram 5 and ram head 6 shown in FIG.

With this structure, when the material is pressed by the pusher head, the material is bitten into the inclined rolling mill, and at the same time, the pressing member 9, which is shorter and hollow, is lighter in weight than the conventional pusher head. However, since it quickly rotates around its axis independently of the pusher head main body 8, no excessive force is applied to the pusher head main body 8, which of course prevents damage to the neck part (see Figure 2). , it is possible to prevent wear on the tip of the pusher head.

As explained above, according to this invention, by attaching a lightweight pressing member to the tip of the pusher head body via a bearing so that it can freely rotate around its axis, no unreasonable force is applied to the pusher head. Breakage and wear of the pusher head can be prevented, and as a result, the service life of the pusher head can be significantly extended, which is a very useful effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a Mannesmann type perforation mode, FIG. 2 is an explanatory diagram of a conventional pusher head, and FIG. 3 is a sectional view of a main part of the pusher head of this invention. In the drawings, 1... Incline rolling mill, 2... Material, 3... Plug, 4... Pusher, 5... Ram, 6... Ram head, 7... Pusher head, 8... Pusher head body, 7'... 7's net section, 8'...
Tip portion of 8, 9... Short tubular pressing member with bottom, 9'...
...bottom, 10, 11...bearing, 12...greasing port,
13...Groove, 14...Labyrinth seal.

Claims (1)

[Scope of utility model registration request] A short tubular pressing member with a bottom is rotatably attached to the tip of the pusher head body through a bearing around its axis, and thus the pressing member is rotatable independently of the pusher head body, and the pressing member is rotated independently of the pusher head body. A push shear head for an inclined rolling mill, characterized in that a hollow rough tube material is brought into contact with the bottom part.