JPS637366Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pinch roll, particularly a pinch roll used in a rolling line to deliver a rolled material while generating strong tension.

In the rolling process, it is known that applying strong tension to the material to be pressed at the exit side of the rolling machine improves the shape of the rolled material after rolling, and the rolling line is equipped with various devices to generate tension. It is being

A pinch roll is one of the devices that generate this tension.

Pinch rolls pinch the rolled material between upper and lower rolls and send it out while applying tension.The tension that can be generated is determined by the pinching pressure of the pinch rolls, and the greater the pinching pressure, the stronger the tension. Can be done.

However, if the clamping force is too large, the rolled material will undergo plastic deformation, so the clamping force is limited to a range in which the rolled material does not undergo plastic deformation.

Referring to FIG. 1, a state in which a rolled material is pinched by conventional pinch rolls will be described.

When the pinching force of the rolled material d is increased in the pinch rolls a, elastic deformation occurs at the contact portions of the width ends of the rolled material between the upper and lower rolls b and c, and the width end portions of the rolled material are first plastically deformed. If the clamping force is further increased, the entire rolled material undergoes plastic deformation. Here, between the clamping force at which the width end of the rolled material begins to undergo plastic deformation and the clamping force at which the entire rolled material begins to undergo plastic deformation, the latter is much greater. Therefore, if plastic deformation at the width ends of the rolled material can be prevented, the clamping force that can actually be applied to the rolled material will be significantly increased.

The present invention was developed in view of the above-mentioned circumstances, and by relieving the partial pinching force at the width end of the rolled material where the rolled material tends to undergo elastic deformation due to the pinching force of the pinch rolls, the overall This makes it possible to increase the pinching force and generate stronger tension with the pinch rolls.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an embodiment of the present invention.

As shown in the figure, at least one of the upper and lower rolls 8 of the pinch roll has a double structure of a core body 1 and a sleeve 2 firmly fitted to the core body 1 by shrinkage fit or the like.

A recess 4 of an appropriate shape is carved on the outer periphery of the core body 1 and near the width end of the rolled material 3 in the axial direction, and the recess 4 and the sleeve 2 form an annular oil chamber 5. The oil chamber 5 and the oil pressure source 6 are connected via a pressure regulating valve 7.

In the above configuration, the radial rigidity of the oil chamber 5 portion is the sum of the rigidity of the sleeve 2 itself and the hydraulic pressure supplied to the oil chamber 5. Therefore, by adjusting the oil pressure using the pressure regulating valve 7, the rigidity of the oil chamber portion can be changed as desired.

Next, the distribution of the squeezing force P acting on the rolled material 3 when the rolled material 3 is pinched by the rolls described above is shown below the rolled material 3 in FIG. Thus, the distributed pressure at the width end portion of the rolled material 3 is made lower than that at the portion where the sleeve 2 and the core body 1 are engaged. Thus, the deformation of the width end portion of the rolled material of the roll 8 as shown in FIG. 1 can be prevented, and the overall clamping force can be significantly increased.

FIG. 3 shows another embodiment of the present invention, in which the end of the core 1 is stepped, a seal 9 is provided at the end of the sleeve 2 and the end of the core 1, and the roll is rolled. 8, an oil chamber 5 is formed at the end thereof.

Figures 4 and 5 show the pinch roll 1 according to the present invention.
0 is installed in a rolling line, and in the figure, 11 is a back-up roll, 12 is an intermediate roll, 13 is a work roll, 14 is a support roll, and 15 is a horizontal deflection prevention cylinder. A high tension can be applied to the rolled material 3 on the outlet side of the rolling mill 16 by the pinch rolls 10, and the shape accuracy of the rolled material 3 can be improved.

As described above, according to the present invention, plastic deformation of the width end portion of the rolled material can be prevented, so that the clamping force can be increased and high tension can be generated in the rolled material.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the pinching state of a rolled material in a conventional pinch roll, FIG. 2 is an explanatory diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the present invention. FIG. 4 and FIG. 5 are explanatory diagrams when the pinch roll according to the present invention is installed in a rolling line. 1 is a core body, 2 is a sleeve, 3 is a rolled material, 5 is an oil chamber, and 6 is a hydraulic power source.

Claims (1)

[Scope of utility model registration request] A pinch roll characterized in that an annular oil chamber is formed in a portion of at least one of the upper and lower rolls of the pinch roll corresponding to the width end position of the rolled material, and the oil pressure of the oil chamber can be adjusted.