JPS5935812A - Method and device for performing cropless rolling by planetary type skew roll mill - Google Patents

Abstract

PURPOSE:To prevent a crop and to improve yield, by forming the front and rear end-parts of a blank material to be rolled into prescribed shapes before supplying the material to a conical roll of a rolling mill. CONSTITUTION:The front end part A1 of a blank material A to be rolled is formed into a truncated conical frustum corresponding to the working zone of rolling of a conical roll 1. Further, the rear end part A2 of the material A is formed into a truncated conical frustum almost symmetrical with respect to that of the part A1. And the length l1 of the frustum at the front end side of the material A is made longer than the length l2 of the frustum at the rear end side. The blank material having the formed both front and rear ends A1, A2 is supplied to the roll 1 rotating on its own axis and revolving around the material A to perform drawing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling method and apparatus for eliminating crops that conventionally occur at the front and rear ends in rolling work of medium-sized material using a planetary inclined roll mill. It is something.

Generally, as shown in Fig. 1, a planetary inclined roll rolling mill rolls a rolled material A having a circular cross section or a polygonal cross section close to this by rotating and revolving three or more circles 6110-1. A roll shaft 2 having a circular polygon 110-ru 1 attached to its tip is moved within three or more individual roll heads 4 held by a rotor 3. Distributed at equal intervals on the inclined axis of the rolled material △,
The rotor 3 is rotatably supported on a fixed housing 5 on the foundation via a hollow shaft 6, and the rotor 3 is rotated by a main drive device via a bevel gear set 7, and an auxiliary drive device rotates the rotor 3 via a bevel gear set 7. The hollow shaft 6 is rotated via the phase 8, and the conical roll 1 is rotated by interlocking the hollow shirt 1 with the roll gears 71 to 2 via the sun gear 9 of 6, the planetary gear 10 that meshes with these gears, and the bevel gear set 11. It's designed to stir.

-3- By the way, the material rolled by this type of rolling mill has conventionally been generally a rolled material A having a circular cross section or a polygonal cross section close to this, with both front and rear ends cut at right angles to its axis. Therefore, when the rolled material Δ is sent from the guide tube 6 to the conical roll 1, the peripheral corner of the frontmost end of the cable material Δ may hit the inclined surface of the circular if roll 1 and be damaged. Immediately after the start, the surface layer of the material Δ was stretched forward, and a hollow crop R1 was formed at the front end, as shown in FIG. 2(a).

Furthermore, just before the end of rolling, the surface layer of material A was stretched rearward, and as shown in FIG. As shown in FIG. 3, the length of the rear end crop R2 was slightly shorter than the front end crop R1.

By the way, the occurrence of J: beat lop R+ and R2 is because the equilibrium relationship of force does not hold at both ends of the material △ as in the middle part of the material, and also because = 4 - crop between the front end and the rear end It is thought that the reason why the length is important is that the working conditions of the force including the rolling blade between the conical roll 1 and the material A are slightly different.

Therefore, conventionally, it is necessary to cut the crops R+ and R2 formed at both the front and rear ends after rolling with a shear, resulting in a low yield and poor work efficiency. Since the conical roll is damaged, there are drawbacks such as shortened conical roll life.

This invention was made in view of the above-mentioned points, and by compressing both the front and rear ends of the rolled material into a truncated conical shape before supplying the material to a planetary inclined roll rolling machine, cropping is prevented. The main purpose is to prevent

The truncated conical shape of both the front and rear ends may be formed by, for example, a compression method using a press or machining using a lathe or the like, and the selection may be made depending on the training effect required in the subsequent process.

Hereinafter, pressing mainly by press-5- of this invention The rolling method employing forming will be explained based on FIG. 4.

Reference numeral 1 designates the circular it roll of the rolling mill B described above, and this roll 1 has a truncated cone-shaped rolling area 1a whose contact surface is inclined with respect to the axis of the rolled material A and mainly performs rolling work; It consists of a small-diameter, truncated cone-shaped straightening area 1b located at the tip of this, whose contact surface is parallel to the axis of the rolled material A, and which performs finishing work to roll the rolled material A to a predetermined size. Further, three conical rolls 1 are usually arranged at intervals of 120° in the circumferential direction.

Then, in a rolling line where the rolled material is heat-treated in a heating furnace, formed into a predetermined shape by a shaping rolling mill, and sent to rolling mill B, the front end A1 of the rolled material is preliminarily cut before being supplied to rolling mill B. The shape formed by the rolling action area 1a of the conical roll 1 or a shape similar to the truncated truncated cone is press-formed by a press device described later, and the rear end A2 of the rolled material A is also formed into a truncated truncated cone shape at the front end. The truncated conical shape is pressed into a truncated conical shape that is approximately symmetrical to the truncated cone and faces backward.The length of the truncated conical shape on the rear end side is /I>
72, so that it is wider than the front end side.

Therefore, if you start the rolling operation in this way,
The front end of the rolled material A comes into contact with the conical roll 1 along the rolling action area 1a, and is drawn and sent forward, making it difficult for the surface layer of the rolled material △ to stretch forward, and the cropping is reduced. Almost never occurs.

Also, at the rear end of the rolled material Δ, when the rolled material Δ is sent forward while being drawn by the rolling action area 1a of the circle ξ110-rule 1, the surface layer of the rolled material A will be stretched rearward. However, since it is absorbed by the truncated conical part whose outer diameter is gradually reduced toward the rear, no cropping occurs.

FIG. 5 shows another embodiment of the present invention, in which, as described above, the circular tit roll 1 has a straightening action area 1b at the tip of the rolling action area 1a, and a plurality of (usually three) conical rolls 1 are provided. Even in the rolling operation using the rolling action area 1a, there remains a portion that is not rolled, but since that part is rolled in this straightening action area 11), cropping is also caused by the straightening action area 11), albeit slightly. Therefore, in order to prevent the occurrence of Rozzo,
When the front and rear ends of the rolling material Δ are pressed into a truncated cone shape, cylindrical portions A11 and Δn corresponding to the outside diameter of the exit side of the rolling mill B are simultaneously pressed and formed in front and behind the rolling material Δ. Ogi, this cylindrical part △11, A? 2 prevents the occurrence of cropping in the straightening action area 11) and allows the rolling material A to be rolled into a perfect circular cross section. In addition,
The length of the front end O': and the rear end cylindrical part A11, △n is 1 circle.
1 [Pitch obtained by one revolution of roll 1, in other words, rolling material A is changed to rolling mill B by one revolution of conical roll 1
The reason for this is that when there are three or more conical rolls, the unrolled portion between the rolling action areas of adjacent conical rolls is 1/3 or less of the pitch of the conical rolls. This is because it becomes.

Next, an embodiment of a press apparatus for carrying out the rolling method of the present invention will be described with reference to FIGS. 6 and 7.

The press device C is installed in front of the planetary inclined roll rolling mill B, and the device main body 12 is movably mounted on rails 13.13 laid parallel to the rolling line of the rolled material A. In addition, a rack 14 is attached to the lower surface of the device main body 12 in the running direction, and a binion 15 that meshes with this rack 14 is attached.
is connected to a drive device 16, such as a DC motor, whose rotational speed is adjustable, so that the device main body 12 can be driven at a controlled speed.

A front-end press mechanism 17 for press-forming the front end of the rolled material A into a truncated cone shape and a rear-end press mechanism 18 for press-forming the rear end of the rolled material A into a truncated-cone shape are provided. , are arranged in parallel on the main body 12 of the apparatus along the rolling line in a contracted and expanded manner. Moreover, these press mechanisms 17.
113 has four parts 19 and 20 which are each integrally assembled to form a predetermined frustoconical shape, and the rolled material A
A pair of profile members 23 and 24 are arranged so as to be movable relative to each other via frames 21 and 22 so as to sandwich the members, and -〇
- consisting of a rack 27.28 fixed oppositely to the lower end of the frame 21.22 and interlocking with an intermediate binion 25.26, which can be rotated via a drive 29 to produce a pair of profiles; 23 and 24 move in opposite directions.

Note that the drive device 29 is common to drive the shapes 23.24 of the front end side and rear end side brace mechanisms 17.18;
3.24 is selectively driven, for example, via a conduction direction switching mechanism. Of course, each breath mechanism 17
．． 18 may be provided with a dedicated drive device and used for different purposes. Further, the reference numeral indicates a shaping rolling mill, and E indicates a heating furnace.

Here, to explain the mode of operation of the press apparatus C of the above embodiment, in FIG. When the position corresponding to the mold material 23 of the front end side press mechanism 17 of the device C is reached, a stopper (not shown) is pressed.
After pressing the front end of the rolled material A to the shape material 23 into a truncated cone shape, the stopper is released = 1
0 - starts feeding the rolling material Δ, feeds it into the guide tube 6 of the rolling IJI B, and causes the tit roll 1 to perform rolling work. Then, when the rear end of the rolled material Δ reaches the position corresponding to the shape material 24 of the rear end side press mechanism 18, the rolling operation is carried out while the device main body 12 is traveling in synchronization with the moving speed of the rolled material A. Without interruption, the rear end of the rolled material A is press-formed into a truncated conical shape using the die '4A24. In this way, the above-described rolling method embodiment of the present invention should be noted. In the above-mentioned embodiment, the compression forming of both front and rear ends of the rolled material is performed at the rear of the heating furnace E; You can also do it with In addition, although the work efficiency is lower than in the above embodiment, two press machines equipped with truncated conical shapes corresponding to the predetermined front end and rear end shapes are adapted to the length of the rolled material A. After the rolled material is stopped at a predetermined position by a stopper, the front end and the rear end can be pressed and formed at the same time.

= 11 - As explained above, according to the rolling method of the present invention, when a rolled material is rolled by a planetary inclined roll mill, the front and rear ends of the rolled material are rolled by the conical rolls of the rolling mill in advance. Since rolling is performed by compression forming into a truncated 11F trapezoid corresponding to the action area, it hardly occurs that only the surface layer of the cable is stretched forward or backward at the front and rear ends of the rolled material. It is possible to reliably prevent the occurrence of cropping. Further, according to this invention, the front end of the rolled material J:
The rolling blade of the circle &lt roll that acts on the truncated conical part at the truncated cone and the rear end becomes smaller, but since the rolling blade acts on these parts when they are compressed into the truncated conical shape, other parts The training effect is not particularly low compared to the rolled parts, so it can be fully utilized as a product, and the yield is improved compared to the conventional rolling method, and there is no need to cut off the cropped parts, so the overall work efficiency is improved. In addition, the feeding of the rolled material to the conical roll is smooth and there are fewer troubles, and the conical roll is not damaged at the frontmost corner of the rolled material as in the conventional method. This has the effect of significantly extending the life of the roll.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the basic structure of a typical planetary inclined roll rolling mill, and Figure 2 is an explanatory diagram showing the process of forming a crop using the conventional rolling method. The leading end of the rolled material A is shown in FIG. 6(b). FIG. 3 is a front view showing a cross section of a part of the material rolled by the conventional rolling method, FIG. 4 is an explanatory diagram showing the rolling method of the present invention,
FIG. 5 is an explanatory diagram showing a rolling method according to another embodiment of the present invention, FIG. 6 is a schematic plan view showing a press apparatus for carrying out the rolling method of the present invention, and FIG. 7 is an explanatory diagram showing a rolling method according to another embodiment of the present invention. It is an enlarged view of the ■-■ line. 1... Circle 8ft roll, 2... Roll shaft, 3
...Rotor, 4...Roll head, 5...Fixed housing, 6...Guide tube, 7.8.11...
・All gear set, 9...Sun gear, 10...Planetary gear,
12...Press device main body, 13...Rail, 14.
... Rack, -13- 15 ... Binion, 16 ... Drive device, 17.18
... Press mechanism, 19.20 ... Recess, 21.22
... Frame, 23.24 ... Shape material, 25.26.
... Binion, 27.28 ... Rack, 29 ... Drive device, Δ ... Rolling material, B ... Planetary inclined roll rolling machine, C ... Press device, D ... Shaping rolling Machine, E
...Heating furnace, R...Crop. Patent applicant agent name -14-

Claims (5)

[Claims] (1) In a rolling operation in which a conical roll of 3 details is rotated and revolved around the rolled material using a planetary inclined roll rolling machine, and the rolled material is drawn, before the rolled material is supplied to the circular button roll. In advance, the front end of the rolled material is formed into a truncated cone shape corresponding to the rolling action area of the conical roll, and the rear end of the rolled material is formed into a truncated truncated cone shape that is approximately symmetrical to the truncated cone shape. Cropless rolling method is characterized by: (2) The length of the truncated cone C1 on the front end side of the rolled material is longer than that of the truncated cone on the rear end side.
Cropless rolling method described in Section. (3) The front side of the truncated cone on the front end side and the rear side of the truncated cone on the rear end side of the rolled material are formed into a cylindrical part corresponding to the outside diameter on the exit side after rolling. Cropless rolling method according to item 1 or 2. (4) The length of the cylindrical part of the rolled material is set to 1/3 or less of one revolution pitch of the conical roll.
Cropless rolling method according to item 3 of 11fl. (5) A device body is installed in front of the planetary inclined roll rolling machine so that it can run along the rolling line, and the device body is movable relative to the body so as to be able to clamp the rolled material, and one end of the material is shaped like a truncated cone. A press mechanism for the front end of the material and a press mechanism for the rear end of the material, each having a pair of mold materials for compression molding, are lignified, and a driving device for selectively driving the mold material of one of the press mechanisms is provided, and the main body A press apparatus characterized in that the drive device is configured to run in synchronization with the speed of the material on a rolling line when pressing the rear end side of the material.