JP4970338B2 - Cold pilger feed claw with leaf spring - Google Patents

Description

  The present invention relates to a cold pilger feed claw using a leaf spring in a cold rolled steel pipe line.

  Conventionally, in cold pilger rolling, cushion rubber is used to open and close the claw of the feed base that holds and feeds the raw pipe. FIG. 6 is a view showing a cushion rubber used in a conventional cold pilger feed base claw. FIG. 6A is a diagram illustrating a state in which the feed claw opening / closing is normal, and FIG. 6B is a diagram illustrating an abnormally deformed state after using the feed claw opening / closing for a long time. As shown in FIG. 6 (a), the raw tube 1 before rolling is placed on the feed base, and the raw tube 1 is fed by opening and closing the feed base claw 2 on the feed base. The feed claw 2 is provided around the base tube 1, the feed claw 2 is supported by a cushion rubber 3, and the feed claw 2 is opened and closed by opening and closing the feed claw 2 by operating the holder 4. Sent.

  However, when the feed claw is used for a long period of time, as shown in FIG. 6B, the cushion rubber 3 for opening and closing the feed claw is crushed by deformation and wear due to opening and closing of the claw 5 Eventually, cracks occur and the feed base claw 2 generates the holder 4 and the interference portion 6, which causes a failure in opening and closing the feed base claw. Thus, the cushion rubber has a very short life, the deformed rubber makes it impossible to open and close the feed claw, rolling stops due to abnormal opening and closing of the claw, and it also takes time to replace the rubber, cold pill The fact is that it is inhibiting the productivity of gar.

On the other hand, as an example similar to the principle of a feed claw for inserting a steel pipe in cold pilger rolling, for example, an improved cosmetic as disclosed in JP-A-11-137335 (Patent Document 1). With regard to the pencil, without holding the tip of the lead by the fingertip, the lead is moved not only in the forward direction but also in the backward direction only by the forward operation by the knock and the pressing force to the rear of the spring. Proposals have been made to use rubber packings for retaining and delivering the cores that are made possible.
Japanese Patent Laid-Open No. 11-137335

  However, the cushion rubber that holds the tube in cold pilger rolling and that is used to open and close the claw of the feed base has a short life and is accompanied by abnormal opening and closing of the feed claw. Eliminating open / close abnormalities was an important issue.

In order to solve the above-mentioned problems, the inventors have intensively developed, and as a result, provided a cold pilger feed claw that uses a long-lasting leaf spring instead of cushion rubber to open and close the feed claw. To do.
The gist of the invention is that
(1) In the opening and closing of the feed base claws that hold and feed the cold piper rolling in the cold rolled steel pipe line, a leaf spring is provided between the feed base claws, and a trapezoidal holder with a narrow tip A trapezoidal feed base claw with a narrow rear end opposite to the holder, and a support body provided with a fulcrum at the center and a cylinder at the upper end are arranged at the rear of the holder , and the upper end of the support is front and rear. A cold pilger feed claw using a leaf spring, wherein the feed claw is opened and closed by moving the holder back and forth.
(2) A cold pill using a leaf spring, characterized in that the opening and closing of the feed base claw described in (1) is made by using a taper between the feed base claw and the holder and a stretching reaction force of the leaf spring. It is on the guard plate claw.

  As described above, by using a leaf spring that has a long life instead of cushion rubber for opening and closing the feed base claw according to the present invention, there is no deformation such as spreading, sticking, bending, etc. of the leaf spring, causing an opening / closing abnormality. Therefore, the productivity can be improved, and a very excellent effect can be obtained in which a life of 10 times or more as compared with the conventional cushion rubber can be obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a process in cold pilger rolling in a cold rolled steel pipe line. As shown in FIG. 1, the raw tube 1 before rolling is placed on a raw tube table 7, and the raw tube 1 supplied from the raw tube table 7 is clamped by a feed table 8 and sent through a control box 9, The feed stand 8 is sent to the roll stand 10. The raw tube 1 sent to the roll stand 10 is rolled while applying roll oil to the outer surface and the inner surface in the stand. The rolled product passes through the product table 12 via the crank 11, passes through the intermediate kicker 13, is cut to a predetermined length, and is conveyed to the cradle 14.

  FIG. 2 is a view showing an opening / closing part of a feed base according to the present invention. As shown in FIG. 2, the feed of the raw tube 1 before rolling is configured such that the holder 4 is operated back and forth by a cylinder, and the feed claw 2 is opened and closed by a leaf spring 15 by a wedge effect. . FIG. 3 is a view showing a state in which the feed base claw is closed according to the present invention. As shown in FIG. 3, the support 17 advances the holder 4 with the fulcrum 18 as a fulcrum by advancing the upper end of the support 17 by the advance of the cylinder 16. As a result, since the holder 4 forms a trapezoidal shape with a narrow tip, the feed base claw 2 is closed by the wedge effect by the leaf spring 15 by moving forward.

  FIG. 4 is a view showing a state where the feed base claw is open according to the present invention. As shown in FIG. 4, contrary to FIG. 3, when the cylinder 16 is retracted, the upper end portion of the support body 17 is retracted with the fulcrum 18 as a fulcrum, and the holder 4 is retracted. As a result, since the tip of the holder 4 forms a narrow trapezoidal shape, the feed base claw 2 is opened by the reaction force of the leaf spring 15 by retreating.

  FIG. 5 is a detailed view of a feed base claw portion using a leaf spring according to the present invention. FIG. 5A is a top view and FIG. 5B is a side view. As shown in FIG. 5, three feed base claws 2 are configured as one set on the circumference of the steel pipe 19, and a leaf spring 15 is provided between the three feed base claws 2 as shown in FIG. 5B. It is configured. The circumferential surface of the steel pipe 19 is gripped by the feed claw 2 or opened by the expansion / contraction reaction force of the leaf spring 15.

Hereinafter, the present invention will be specifically described with reference to examples.
As shown in FIG. 1, a raw tube 1 before rolling is placed on a raw tube base 7, and the raw tube 1 supplied from the raw tube base 7 is clamped by a feed base 8, passed through a control box 9, and rolled into a roll stand. 10 is sent. In clamping in the feed table 8 in these processes, a leaf spring 15 is used to open and close the feed claw 2 that holds the base tube 1. The thickness of the feed claw at this time was 8 mm or more, and the outer diameter of the steel pipe that can be held by the feed claw at that time was φ45 to 82 mm. After this use, the degree of deformation such as spreading, settling, and bending of the leaf spring was confirmed, and the number of times of abnormal opening / closing of the feed base was confirmed. As a result, when the conventional cushion rubber was used, an opening / closing abnormality of 25 times / month occurred. On the other hand, when the leaf spring of the present invention was used, the result was 2 to 3 times / month, and it was possible to obtain a long life of about 10 times.

  As described above, the use of leaf springs to open and close the conventional feed base pawls can extend the life of the leaf springs, and there is no deformation such as spreading, sticking, bending, etc. Rolling becomes possible, and an extremely excellent effect that productivity can be improved is achieved.

It is a figure which shows the process in the cold pilger rolling in a cold rolled steel pipe line. It is a figure which shows the opening-and-closing part of the feed stand which concerns on this invention. It is a figure which shows the state of a feed stand nail | claw closing which concerns on this invention. It is a figure which shows the state of a feed stand nail | claw opening which concerns on this invention. It is detail drawing of the feed stand nail | claw part which uses the leaf | plate spring which concerns on this invention. It is a figure which shows the cushion rubber used for the conventional cold pilger feed stand nail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elementary tube 2 Feeding table nail 3 Cushion rubber 4 Holder 5 Crushed state 6 Interference part 7 Elementary tube table 8 Feeding table 9 Control box 10 Roll stand 11 Crank 12 Product table 13 Intermediate kicker 14 Cradle 15 Leaf spring 16 Cylinder 17 Support body 18 fulcrum 19 steel pipe


Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney: Attorney Shiina

Claims (2)

In the opening and closing of the feed claw that holds the cold pilger rolling raw pipe in the cold rolled steel pipe line, a leaf spring is provided between the feed claw, and a trapezoidal holder with a narrow tip and the above holder Is a trapezoidal feed base claw with a narrow rear end, and a support with a fulcrum at the center and a cylinder at the upper end arranged at the rear of the holder , and the upper end of the support is moved forward and backward A cold pilger feed claw using a leaf spring, wherein the holder is moved forward and backward to open and close the feed claw. A cold pilger feed claw using a leaf spring characterized in that the feed claw according to claim 1 is opened and closed using a taper between the feed claw and a holder and a stretching reaction force of the leaf spring. .

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