JP2002210504A - Method and apparatus for rolling by ring rolling - Google Patents

Method and apparatus for rolling by ring rolling

Info

Publication number
JP2002210504A
JP2002210504A JP2001011339A JP2001011339A JP2002210504A JP 2002210504 A JP2002210504 A JP 2002210504A JP 2001011339 A JP2001011339 A JP 2001011339A JP 2001011339 A JP2001011339 A JP 2001011339A JP 2002210504 A JP2002210504 A JP 2002210504A
Authority
JP
Japan
Prior art keywords
rolled
diameter
rolling
mandrel
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2001011339A
Other languages
Japanese (ja)
Inventor
Shoichi Ando
Takashi Ariizumi
Yoshihiro Hirase
Sadakazu Masuda
Takeshi Yamada
貞和 升田
正一 安藤
猛志 山田
欣弘 平瀬
孝 有泉
Original Assignee
Nkk Corp
日本鋼管株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nkk Corp, 日本鋼管株式会社 filed Critical Nkk Corp
Priority to JP2001011339A priority Critical patent/JP2002210504A/en
Publication of JP2002210504A publication Critical patent/JP2002210504A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of defects in shape such as dents on a ring- like material to be rolled and to perform forming by ring rolling while keeping the ring-like material to be rolled in the circular shape. SOLUTION: As a mandrel for performing thickness reduction in the radius direction of a material 1 to be rolled together with a main roll 2, a mandrel 3C the diametral ratio to the main roll 2 of which is 10-25% is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for performing ring rolling rolling so that a ring-shaped material to be rolled has a target outer diameter, inner diameter, and height.

[0002]

2. Description of the Related Art FIG. 3 schematically shows an example of a conventional ring rolling mill (hereinafter referred to as a first conventional example), where (a) is a side view including a partial cross-sectional view, and (b). Is a plan view thereof. FIG. 4 is an explanatory view of a deformed shape of a ring-shaped material to be roll-formed by the first conventional apparatus.

In FIG. 3, 1 is a ring-shaped material to be rolled (hereinafter simply referred to as a material to be rolled), 2 is a main roll, 3A is a small-diameter mandrel whose diameter ratio to the main roll 2 is set to 10% or less. Is an edger roll (hereinafter simply referred to as an edger), 5 is a tracer, and 6a to 6d are guide rolls, which are arranged before and after the main roll 2 and the mandrel 3A, and before and after the edger 4, and are subjected to ring rolling forming. It has the function of holding one circle.

In the ring rolling rolling, while the diameter of the material 1 to be rolled is detected by the tracer 5, the material 1
Is rolled in the radial direction by the main roll 2 and the mandrel 3A, and the height is rolled in the axial direction by the upper and lower conical edgers 4 and 4. The rolled material 1 can grow in outer diameter while being kept circular by the guide rolls 6a to 6d.

The main roll 2 is fixed, and has a function of rotating the material to be rolled 1 at a constant peripheral speed while rotating at a constant speed. The mandrel 3 </ b> A is driven and disposed on the inner diameter side of the material to be rolled 1, sandwiches the ring-shaped material to be rolled 1 together with the main roll 2, moves in the direction of the main roll, and performs reduction in the thickness direction. I have.

In the edgers 4, 4, one or both of the conical rolls are generally arranged vertically at positions 180 ° different from the main roll 2, and usually, the upper roll moves downward to be rolled. The material 1 is reduced in the height direction. The reason why the edgers 4 and 4 have a conical shape is that the peripheral speed of the material 1 to be rolled is different between the inner peripheral side and the outer peripheral side (inner peripheral side <outer peripheral side).
This is because it is necessary to absorb the peripheral speed difference. Therefore, the edgers 4, 4 are arranged so that the tip of the conical roll coincides with the center of the material 1 to be rolled. It moves in the direction (larger diameter side).

FIG. 5 schematically shows another example of a conventional ring rolling mill (hereinafter, referred to as a second conventional example), in which (a) is a side view including a partial sectional view, and (b). Is a plan view thereof. FIG. 6 is an explanatory view of a deformed shape of a ring-shaped material to be roll-formed by the first conventional apparatus. In the respective drawings, the same parts as those of the above-mentioned first conventional example are denoted by the same reference numerals.

The ring rolling mill of the second conventional example uses a large-diameter mandrel 3B whose diameter ratio to the main roll 2 is set to 25% or more as a mandrel. The above-mentioned first
This is basically the same as the conventional device.

Such a method of controlling the ring rolling mill is described in, for example, JP-A-54-155977 (hereinafter referred to as a third conventional example) and JP-A-54-161.
No. 560 (hereinafter, referred to as a fourth conventional example), and a method of controlling a guide roll is disclosed in Japanese Patent Application Laid-Open No. 54-6855 (hereinafter, referred to as a fifth conventional example). Can be.

The control method shown in the third conventional example controls the outer diameter growth rate of the material to be rolled so as to coincide with the previously stored outer diameter growth rate of the material to be rolled.

Further, in the control method shown in the fourth conventional example, the rolling step in the radial direction for the material to be rolled is constituted by a plurality of steps, and the rolling force of the material to be rolled is made constant within the section. To control.

The control method shown in the fifth conventional example controls the upper and lower edgers so that the contact pressure between the material to be rolled and the guide rolls is kept constant.

[0013]

However, in the methods described in the first to fifth prior art examples, the method of setting the initial shape for the final shape of the material to be rolled and the method for changing from the initial shape to the final shape are all used. It has not been verified what kind of route and how much time to reduce.

According to the experiment of the present inventor, the shape of the material to be rolled is superior or inferior. It has been found that dents (indentations in the height direction) 1a and 1b and dents (indentations in the thickness direction) 1c and 1d occur on both side surfaces and that the circular shape cannot be maintained.

That is, rolling is started after the mandrel is inserted into the material to be rolled. Therefore, as the diameter of the mandrel is smaller than that of the main roll, rolling can be performed from the time when the initial shape (inner diameter shape) of the material to be rolled is small, so that a growth step (pre-processing) for forming is not required, and There is the advantage that less material is wasted and discarded to insert the mandrel. However, the smaller the diameter of the mandrel, the smaller the arc length of contact with the material to be rolled, and the more the mandrel bites into the main roll. In particular, as shown in FIG. In the case where a small-diameter mandrel 3A having a diameter ratio to 10% or less is used, the material 1 to be rolled 1 is asymmetrically recessed in the thickness direction in which the mandrel side is greatly deformed as shown in FIG. 1b occurs.

The main roll 2 is used as a mandrel.
In the case of the second conventional example (FIG. 5) using a large-diameter mandrel 3B whose diameter ratio is set to 25% or more, the contact arc length of the mandrel 3B with the material 1 to be rolled increases, and pressure is distributed. The occurrence of biting is reduced, and as shown in FIG. 6, the recesses 1a and 1b in the height direction and the recesses 1c and 1d in the thickness direction of the material 1 to be rolled fall within the allowable ranges. However, as the diameter of the mandrel 3B approaches the main roll 2, the contact arc length with the material 1 to be rolled increases, and the material 1 to be rolled can be advanced in the tangential direction. Even if an attempt is made to forcefully maintain the circular shape by 6a to 6d, the circular shape cannot be maintained due to springback or the like existing in the material 1 to be rolled. As a result, even if the upper and lower edgers are controlled while keeping the contact pressure between the material to be rolled and the guide rolls constant as in the fifth conventional example, the material to be rolled runs around, and when it is severe, the material as shown in FIG. The material 1 is deformed into an elliptical shape.

In view of the above, an object of the present invention is to reduce the occurrence of shape defects such as dents in a ring-shaped material to be rolled, and to perform ring rolling while maintaining the ring-shaped material to be rolled in a circular shape. To be able to do it.

[0018]

According to a first aspect of the present invention, there is provided a ring rolling rolling method, wherein the outer diameter of a ring-shaped material to be rolled is detected by a tracer while reducing the radial thickness reduction of the material to be rolled. A main roll and a mandrel,
By a pair of upper and lower edger rolls that reduce the height of the material to be rolled in the axial direction, the outer diameter, the inner diameter, which targets the material to be rolled,
The method of performing ring rolling rolling so as to have a height is characterized in that a mandrel having a diameter ratio to a main roll of 10 to 25% is used as a mandrel, and the thickness of a material to be rolled is reduced in a radial direction.

The apparatus according to claim 2, which is used in this method, comprises a main roll and a mandrel for reducing the thickness of the material to be rolled in the radial direction while detecting the outer diameter of the material to be rolled by a tracer. And, by a pair of upper and lower edger rolls that perform the height reduction in the axial direction of the material to be rolled, in a device that performs ring rolling rolling so that the material to be rolled has the target outer diameter, inner diameter, and height, The diameter is set to 10 to 25% of the diameter of the main roll.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ring rolling method according to an embodiment of the present invention and an apparatus used in the method will be described below with reference to FIGS. FIG. 1 schematically shows a ring rolling mill according to the present embodiment, in which (a) is a side view including a partial sectional view, and (b) is a plan view thereof. FIG. 2 is an explanatory view of a deformed shape of a ring-shaped material to be roll-rolled by the apparatus of the present embodiment. In each figure, the same reference numerals are given to the same parts as those of the first conventional example. It is.

In the ring rolling mill of the present embodiment, the mandrel 3C for performing the thickness rolling of the material 1 to be rolled in the radial direction together with the main roll 2 has a diameter ratio to the main roll 2 of 10 to 25%. Is characterized in that it is the same as that of the first embodiment described above.
This is basically the same as the conventional device.

The reason why the diameter ratio of the mandrel 3C to the main roll 2 is set to 10 to 25% in the ring rolling mill of the present embodiment is as follows. That is, the mandrel 3C with respect to the diameter of the main roll 2
When the diameter is smaller than 10%, deformation occurs such that the mandrel 3C bites into the material 1 to be rolled during ring rolling, and as a result, dents when the thickness is reduced are localized on the mandrel side, and the amount of dents is large. And even if the height direction is rolled by the edgers 4 and 4, dents accumulate,
This is because it becomes difficult to remove. When the diameter of the mandrel 3C is larger than 25% of the diameter of the main roll 2, the guide rolls 6a to 6d are formed at the time of ring rolling.
This is because even if an attempt is made to control the roundness of the material 1 to be rolled in 6d, the material 1 to be rolled cannot maintain a circular shape and becomes elliptical or run around.

As in the present embodiment, the diameter of the mandrel 3C is set to be 10 to 25% of the diameter of the main roll 2 and ring rolling is performed to reduce dent deformation during thickness rolling. The rolling can be reduced, and normal rolling can be performed while maintaining the circular shape of the material 1 to be rolled.

The results of forming by the ring rolling method of the present invention are shown in Table 1 below in comparison with the case where the mandrel / main roll diameter ratio is not within the range of the present invention.

[0025]

[Table 1]

In Table 1, the steel type used was S45C
The material before ring rolling has an outer diameter of 500 mm, an inner diameter of 240 mm, a height of 130 mm, and the final product shape has an outer diameter of 12 mm.
It is 40 mm, inner diameter 1100 mm, and height 76.3 mm. When the outer diameter is 500mm to 1220mm, the outer diameter growth rate is 6mm / s
ec and the outer diameter is from 1220mm to 1240
Control the outer diameter growth rate to 2 mm / sec up to mm,
The position of the height of the ring-shaped material to be rolled was controlled with respect to the outer diameter. From an initial height of 130 mm when the outer diameter is 500 mm to an outer diameter of 124
The height was linearly controlled with respect to the outer diameter up to a height of 76.3 mm at 0 mm.

Further, when the diameter of the main roll was 1200 mm, the dent amount and the overall shape of the molded product were compared while changing the mandrel diameter from 100 mm to 320 mm.

As is apparent from Table 1, when a mandrel having a mandrel / main roll diameter ratio of 10 to 25%, which is the range of the present invention, is used, the mandrel / main roll diameter ratio is not within the range. Compared with the example, the dent amount was reduced, and the rolling could be performed while maintaining the circular cross section.

[0029]

As described above, according to the ring rolling rolling method of the first aspect of the present invention and the apparatus of the second aspect used in this method, it is possible to reduce the dent on the surface of the ring rolling molded product. In addition, a perfectly circular molded product could be molded with good reproducibility. Therefore, the step of finishing the molded article can be omitted, and the yield and productivity of the product have been improved.

[Brief description of the drawings]

FIG. 1 is a side view and a plan view schematically showing a ring rolling mill according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a deformed shape of a ring-shaped material to be roll-formed by the apparatus according to the embodiment.

FIG. 3 is a side view and a plan view schematically showing a ring rolling mill of a first conventional example.

FIG. 4 is an explanatory diagram of a deformed shape of a ring-shaped material to be roll-formed by ring rolling using the apparatus of the first conventional example.

FIG. 5 is a side view and a plan view schematically showing a ring rolling mill of a second conventional example.

FIG. 6 is an explanatory view of a deformed shape of a ring-shaped material to be roll-formed by ring rolling using the apparatus of the second conventional example.

FIG. 7 is an explanatory diagram of a problem (occurrence of dent) according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped material to be rolled 2 Main roll 3A, 3B, 3C Mandrel 4 Edger roll 5 Tracer 1a, 1b Indentation in height direction 1c, 1d Indentation in thickness direction

Continued on the front page (72) Inventor Sadaka Masuda 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Takeshi Yamada 4-6 Kojimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside processing company (72) Inventor Shoichi Ando 4-6 Kojimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Pref.

Claims (2)

[Claims]
1. A main roll and a mandrel for reducing the thickness of a material to be rolled in a radial direction while detecting an outer diameter of the material to be rolled by a tracer, and an axial height of the material to be rolled. A method in which a pair of upper and lower edger rolls for rolling perform ring rolling rolling so that the material to be rolled has a target outer diameter, inner diameter, and height, wherein the mandrel has a diameter ratio of 10 to the main roll. A ring rolling rolling method, wherein a thickness of the material to be rolled is reduced in a radial direction using a mandrel of up to 25%.
2. A main roll and a mandrel for reducing the thickness of a material to be rolled in a radial direction while detecting an outer diameter of the material to be rolled by a tracer, and an axial height of the material to be rolled. By a pair of upper and lower edger rolls to perform rolling, in the apparatus that performs ring rolling rolling so that the material to be rolled has the target outer diameter, inner diameter, and height, the diameter of the mandrel is the diameter of the main roll. 1
A ring rolling mill characterized by being set to 0 to 25%.
JP2001011339A 2001-01-19 2001-01-19 Method and apparatus for rolling by ring rolling Withdrawn JP2002210504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001011339A JP2002210504A (en) 2001-01-19 2001-01-19 Method and apparatus for rolling by ring rolling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001011339A JP2002210504A (en) 2001-01-19 2001-01-19 Method and apparatus for rolling by ring rolling

Publications (1)

Publication Number Publication Date
JP2002210504A true JP2002210504A (en) 2002-07-30

Family

ID=18878486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001011339A Withdrawn JP2002210504A (en) 2001-01-19 2001-01-19 Method and apparatus for rolling by ring rolling

Country Status (1)

Country Link
JP (1) JP2002210504A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102615224A (en) * 2012-03-30 2012-08-01 山东建筑大学 Radial-axial rolling forming method for inner step section ring pieces
JP5581429B1 (en) * 2013-08-06 2014-08-27 株式会社山下鍛造所 Ring rolling mill
CN105108016A (en) * 2015-09-23 2015-12-02 武汉理工大学 Radial rolling method for ring piece with controllable strain distribution
CN105382154A (en) * 2014-12-15 2016-03-09 贵州安大航空锻造有限责任公司 Rolling molding method for nickel-based high-temperature alloy thick-wall ring forge piece
CN105562571A (en) * 2016-02-29 2016-05-11 无锡市派克重型铸锻有限公司 Aluminum alloy forging grinding ring lubricating process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102615224A (en) * 2012-03-30 2012-08-01 山东建筑大学 Radial-axial rolling forming method for inner step section ring pieces
CN102615224B (en) * 2012-03-30 2015-12-02 山东建筑大学 The method that inner step profile section ring parts radial-axial rolling is shaped
JP5581429B1 (en) * 2013-08-06 2014-08-27 株式会社山下鍛造所 Ring rolling mill
CN105382154A (en) * 2014-12-15 2016-03-09 贵州安大航空锻造有限责任公司 Rolling molding method for nickel-based high-temperature alloy thick-wall ring forge piece
CN105108016A (en) * 2015-09-23 2015-12-02 武汉理工大学 Radial rolling method for ring piece with controllable strain distribution
CN105108016B (en) * 2015-09-23 2017-03-22 武汉理工大学 Radial rolling method for ring piece with controllable strain distribution
CN105562571A (en) * 2016-02-29 2016-05-11 无锡市派克重型铸锻有限公司 Aluminum alloy forging grinding ring lubricating process
CN105562571B (en) * 2016-02-29 2018-02-09 无锡派克新材料科技股份有限公司 A kind of aluminum alloy forged rolling ring lubricating process

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A300 Withdrawal of application because of no request for examination

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Effective date: 20080401