JPS6068111A - Method for controlling dimension of extruded material - Google Patents

Abstract

PURPOSE:To obtain an extruded material excellent in dimensional accuracy by arranging a control die of a small reduction rate of area at the exit side and moving the die vertically with respect to an extrusion center line basing on the deviation of the detected dimension of extruded material at the exit side from its reference value. CONSTITUTION:A control die 18 of a small reduction rate of area and a die holder 19 are provided to the exit side of an extrusion device 1, and hydraulic devices 21, 21' move vertically the die 18 and the holder 19 while interlinking themselves to each other. The 1st holder frame body 20 is provided with hydraulic devices 22, 22' and is laterally movable with respect to the 2nd holder frame body. A dimension detector 24 detects the dimension of an extruded material 2' to transmit a signal to a control arithmetic device 25, which operates the moving direction and quantity of the die 18 basing on the deviation of the detected value from its reference value. Based on the operated values, the devices 21, 22, etc. move the die 18 by a required quantity, and the extrusion of material 2' is correctingly controlled to obtain a product excellent in dimensional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the dimensions of hot extruded metal materials, such as seamless steel pipes.

Furthermore, the present invention provides the I-type with at least one 1filJ standard die with a relatively small area reduction rate on the exit side of the extrusion device, detects the uneven thickness of the material after extrusion, and adjusts the size according to the amount of uneven thickness. The purpose of the present invention is to provide extruded material products with high dimensional accuracy by moving a control die vertically from the extrusion center axis to perform extrusion for dimensional control.

Many methods have been proposed to improve the dimensional accuracy of conventional extruded material products at night, such as improving the precision of the extrusion device itself, improving the jig, or eliminating uneven heat in the extruded material. These methods are important factors in improving the dimensional accuracy of products. However, improving and managing the precision of the extrusion device itself or the jig requires long equipment outages, resulting in a decrease in production efficiency, and it is not possible to deal with uneven heat of the material. Furthermore, even if efforts are made to improve the quality of the material and eliminate uneven heat distribution, it has not been possible to completely eliminate dimensional errors in hot extrusion products because they are caused by many factors as described above.

A method for correcting such dimensional defects in hot extrusion products based on actual measurements of product dimensions is disclosed in Japanese Patent Application Laid-Open No. 53-112255.
proposed in No. The technology described in this publication detects the dimensions of an extruded material product or the response pattern that occurs in an extrusion processing tool, and determines whether one of the container, die, mandrel, or stem of the extrusion device is determined based on the deviation of the detected value from the standard value. or to a method and apparatus for controlling position relative to one or more extrusion centers.

However, during hot extrusion, a large force of 200 to 400 tons is applied to the container, die, mandrel, stem, etc., so it is extremely difficult to move these parts during extrusion, and hot extrusion processing is difficult. Since the material deformation in this process is concentrated in the die area and occurs at an extremely high speed, it is difficult to control the material so as to reliably eliminate uneven thickness areas. Furthermore, in this prior art method, the dimensions of the extruded material are detected on the exit side of the extrusion device, and the extrusion device itself is controlled by feed hack based on this, so it is not possible to reliably prevent uneven thickness of the extrusion mill distributed in the extrusion direction. .

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a simple and reliable method for controlling the dimensions of hot extruded materials.

More specifically, it is an object of the present invention to provide a product free of radial dimensional deviations distributed in the extrusion direction during hot extrusion of metal tubes such as seamless steel tubes.

According to the present invention, at least one size control die with a small area reduction rate is provided on the exit side of a metal hot extrusion device, and the dimensions of the extruded material are detected on the exit side of the extrusion device. A method for controlling dimensions of an extruded material, characterized in that extrusion for controlling dimensions is performed by moving the dimension controlling die in a vertical direction from the extrusion center axis of the extrusion device based on the deviation between the standard value and the detected value. is provided.

The extrusion center refers to the axial center of the mandrel of the extrusion device.

The size control die is perpendicular to the extrusion direction and is preferably configured to be movable in directions orthogonal to each other, for example, up, down, left and right directions, and is preferably movable in any direction within a plane perpendicular to the center of extrusion. .

Further, it is preferable that the size control die be a roller die so that the extruded material can be easily bitten and extruded.

In the method of the present invention, a die for size control is specially provided, and the area reduction rate of this die for size control is made low, so that the size control die can be easily moved. Fine dimensional control becomes possible.

Furthermore, since the dimensions of the extruded material are corrected based on actual measurements, the dimensional accuracy in the axial direction of the extruded material is improved.

Furthermore, the method of the present invention can be carried out using a simple device, and the device can be easily maintained and inspected.

Other features and effects of the present invention will become clearer from the following description of embodiments with reference to the accompanying drawings.

Implementation Jfi Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an apparatus for practicing one aspect of the invention.

The extrusion device, designated in its entirety by the reference numeral 1, is for example a biresol l-
Container means 3 for accommodating heated extruded material 2 such as
, a die means 4 which is arranged behind the container means 3 and determines the external shape of the extruded material, and a bolster 5 which supports and guides the extruded material 2'. and mandrel means 6.

More specifically, the container means 3 includes a container liner 7 that defines a space for accommodating the material 2 and is formed so that the material 2 slides at the same temperature during extrusion, and a container liner 7 that is rigid in the circumferential direction. It is composed of a liner boulder 8 that is held in place by the container means, and a frame body 9 that is rigidly integrated with the liner holder 8 and holds the liner boulder 8 to form an outer frame of the entire container means.

The die means 4 is composed of a die body 10, a die cutter 11 that fixes and holds the die body 10 in the extrusion direction, and a die boulder 12 that groove-joins the die cutter 11 and fixes and holds the die body 10 in the radial direction. At a position immediately in front of the die body 10, a moisturizing material such as water glass is sprinkled onto the surface of the material 2 by means not shown.

The container means 3, the die means 4 and the bolster 5 are rigidly installed relative to each other so as to withstand stress during compression.

Extrusion processing is carried out by pressing the material 2 in the container liner 7 with an amplifier set therein by the mandrel means G. The mandrel 15 is rigidly held by a mandrel 15. The inner surface of the material 2 is extruded into a shape determined by a mandrel I5 and the outer surface by a die 10.

Since the second configuration is the same as that of a known extrusion device, further detailed explanation will be omitted.

The purpose of the present invention is to eliminate uneven thickness of extruded material, and according to the present invention, a dimension control die device 17 is disposed on the exit side of the extrusion device 1.

The dimension control die device 17 is equipped with a control die I8 and a control die holder 19 that holds it, and the die holder 19 is equipped with a hydraulic device provided on both sides and below of the first holder frame 20, respectively. 21. It is connected to 21゛. These hydraulic devices 21 and 21' are configured to interlock with each other and move the die 18 and the die holder 19 up and down integrally. For this reason, dice boulder 1
9 is fitted into a vertical groove in the first boulder frame 20 and is movable only in the vertical direction, and is rigidly supported in other directions.

FIG. 2 is a cross section taken along the line AA in FIG. 1, and the first holder frame 20 is equipped with a plurality of hydraulic drive devices 22.22' on the left and right sides. The hydraulic drive device 22.22" is also configured to operate in conjunction with the hydraulic drive device 21.21" to move the holder first frame 20 in the left and right direction with respect to the extrusion center direction (in the direction perpendicular to the paper surface of FIG. 1). ing.

The first frame 20 of the holder is fitted into the second frame 23 in a horizontal dovetail groove, and therefore the first frame 20 of the holder is fitted with the second frame 23 in a horizontal dovetail groove.
8. It is movable only in the left and right direction together with the die holder 19, and is rigidly supported in other directions.

A dimension detector 24 is arranged downstream of the second support frame 23. The dimension detector 24 is configured to detect the wall thickness of the extruded material 2'' at appropriate positions equally spaced in the circumferential direction of the extruded material 2''. A sonic type is preferred.An optical type may be used to detect the outer diameter of the extruded material in each direction of 2°.

The detection signal of the dimension detector 24 is input to the control calculation device 25, which calculates the deviation value from the standard value and the movement direction and movement amount of the dimension control die 18 necessary to correct the deviation value and adjusts the hydraulic pressure. Drives 21, 21' and 22 and 22°
Output to. In order to clearly illustrate the configuration, the attached drawings show the control calculation device 25 and the hydraulic drive device 2L 21° and 22.
．． 22' is not shown.

Although the dimension detector 24 may be arranged downstream of the dimension control device 17 as shown in the figure for feedback control, it may also be arranged upstream of the dimension control die on the exit side of the extrusion device 1 for feedforward control. Good too.

For example, when the cross section of the extruded material 2'' is thick at a 45° clockwise position and thin at a symmetrical position, the movement of the die 8 is controlled to move the die 18 downward and to the left at 45°. The die 18 is moved by the distance calculated by the calculation device 25. This movement is performed by lowering the dice 18 by the vertical component of the above distance using the hydraulic drive device 21.21', and by moving the dice 18 by the horizontal component by the hydraulic drive device 22.22'. This is done by moving the dice 18.

Although the present invention has been described above by way of embodiments with reference to the accompanying drawings, it goes without saying that the scope of the present invention is not limited to these embodiments.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of lines used to carry out a method according to one aspect of the invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. (Main reference numbers) 1: Extrusion device, 2: Extruded material (billet), 3: Container means, 4: Die means, 5: Bolster, 6: Mandrel means, 17: Dimensional control die device, 18 Two-dimensional system Zen dice, 19: Dice holder, 20: Holder first frame, 21.21.22, 22: Hydraulic drive device, 23: Second
Support frame body, 24: Dimension detector, 25: Control calculation device Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Masahiko Arai

Claims (1)

[Claims] At least one dimension control die with a small area reduction rate is provided on the exit side of a metal hot extrusion device, and the dimensions of the extruded material are detected on the exit side of the extrusion device, and based on the deviation between the standard value and the detected value. A method for controlling the dimensions of an extruded material, characterized in that extrusion for controlling the dimensions is performed by moving the die for dimension control in a vertical direction from the extrusion center axis of the extrusion device.