JPS63123545A - Manufacture of bar stock of dissimilar diameter - Google Patents

Abstract

PURPOSE:To obtain the bar of dissimilar diameter in the necessary length with good accuracy by using the slanting rolling mill made by biholding the rolls in the necessary number by facing to a pass line and forming the bar of dissimilar diameter from a cylindrical blank by adjusting the distance between the roll and pass line with oil pressure. CONSTITUTION:A slanting rolling mill 20 faces three or four conical rolls 1... around a pass line and each roll shaft le... is supported by biholding it with checks 23, 24 at the inlet side and outlet side respectively. This rolling mill 20 moves the cylindrical hot blank 10 bitten between the rolls 1... in the shaft length direction with driving it by rotating around the shaft center line thereof and works the dissimilar diameter bar 11 whose outer diameter varies at the position in the shaft length direction. In case of working, the distance between each roll 1... and the pass line is adjusted via the chocks 23, 24 by the hydraulic cylinders 25, 26 fixed to a rotary and stationary housings 21, 22 respectively. The dissimilar diameter bar in the necessary length can be thus manufactured with good dimensional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing a different diameter bar such as a different diameter steel bar whose outer diameter differs depending on the position in the axial direction by processing a cylindrical material.

[Prior art]

Different diameter steel bars have different outer diameters depending on their position in the axial direction.
Conventionally, round steel pieces have been manufactured by hot forging to change the outer diameter in the axial direction position, forming the outer surface into a stepped shape, and cutting this into a predetermined size.

This method has the disadvantage that noise is generated by intermittent hammering during hot forging.

As a method for solving this difficulty and producing steel bars of different diameters,
There is a helical roll processing method. This method involves three rolls 31, 31 placed around the pass line as shown in Figure 9.
．． The tip of a cylindrical material 35 is bitten between the holes 31 and 31, and after the tip is clamped by the chuck 34, the material 35 is pulled out, and the distance between the roll and the pass line is adjusted to the position in the axial direction of the material 35. This is a method of manufacturing steel bars 36 of different diameters by changing the method accordingly.

[Problem that the invention seeks to solve]

However, in the case of the above method, since the shaft 31a supporting the roll 31 is of a cantilever type (see FIG. 9),
The problem is that the shaft 31a etc. are bent during processing, the dimensional accuracy of the steel bar of different diameter is poor, and the length that can be pulled out of the material 35 is determined by the equipment because it is pulled out by the chuck 34, making it impossible to manufacture a long steel bar of different diameter 36. There was a point.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing bars of different diameters with good dimensional accuracy and regardless of length.

[Means for Solving Problem C] The present invention allows the material to move in the axial direction by itself by processing the material, supports the roll in a double-supported type, and reduces the distance between the roll and the pass line. An inclined rolling mill that is adjusted by a hydraulic mechanism is used to adjust the above-mentioned distance during processing of the material.

That is, the method for manufacturing bars of different diameters according to the present invention is a method of processing a cylindrical material to produce bars of different diameters whose outer diameters differ depending on the position in the axial direction. Alternatively, the material can be processed using an inclined rolling mill that has four rolls, the axis of each roll is supported on both sides of the roll, and the distance between the roll and the pass line can be adjusted by hydraulic pressure. In this case, bars with different diameters are manufactured by adjusting the distance.

[Effect]

In the present invention, the material is rolled with inclined rolls of a double-sided type to reduce its diameter, and the material is rolled further, and during rolling, the distance between the rolls and the pass line is adjusted by hydraulic control. , resulting in bars with different diameters.

Therefore, +A with excellent dimensional accuracy and suppresses noise generation.
It can be manufactured regardless of the length of the radial material.

〔Example〕

Hereinafter, the present invention will be specifically explained based on the drawings regarding the case where a roll of H[lil is used. Fig. 1 is a side cross-sectional view of an inclined rolling mill showing the implementation state of the present invention together with a block diagram (a view taken along the line [-I in Fig. 2]), and Figs. 2 and 3 are its front and rear views. , FIG. 4 is a side view showing the vicinity of the roll (roll 1.2 in the figure is a sectional view taken along the line rV-rV in FIG. 5), FIG. 5 is a front view taken along the line V-V in FIG. 4, FIG. 6 is a side view showing the (IJi oblique angle β), in which IO indicates a cylindrical material. The material 10 is heated to a predetermined temperature in a heating furnace (not shown), and then While being spirally transferred in the axial direction (in the direction of the white arrow), the reduction amount is changed in stages according to the axial position in the cross-type inclined rolling TA20, which is capable of high workability rolling. The steel bar 11 is rolled and reduced in diameter, thereby becoming a different diameter steel bar 11, which is then cooled in a cooling device (not shown) and sent further downstream.

The inclined rolling mill 20 has three cone-shaped rolls 1, 2.3 facing around the pass line (see 2nd TyJ), each roll 1. 2. The shafts 1e, 2e, 3e of 3 are rotatably supported on the entry side and the exit side by the entry side chock 23.23.23 and the exit side chock 24.24.24 with each roll 1°2.3 in between. The inlet chocks 23, 23, 23 and the outlet chocks 24, 24, 24 are supported by support rods 23a, 23, 24, 24, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 type type type types types have be in the inlet side of.
The base end portions of a, . . . are connected to the rotating housing 21. It is slidably inserted into a hole (not shown) formed in the fixed housing 22 (see FIGS. 2 and 3). In other words, the rolls 1, 2.3 are of a dual-support type.

Three entry chocks 23. The cylinder rod of each hydraulic cylinder 25, 26 is attached to the base end of the outlet chock 24, and the cylinder tube of each hydraulic cylinder 25, 26 is connected to the rotating housing 21, respectively. It is fixedly installed in the fixed housing 22. The distance between the entry chock 23 and the pass line and the distance between the exit chock 24 and the pass line are adjusted by hydraulic cylinders 25 and 26, respectively. Therefore, the distance between the roll and the pass line is adjusted by adjusting the distance between the pass line and the entry and exit chocks that support both ends of the roll.

A cylinder rod of a hydraulic cylinder 27 is attached to the rotating housing 21, and a cylinder tube of the hydraulic cylinder 27 is fixed to the fixed housing 22. The rotary housing 21 is rotated relative to the fixed housing 22 by a hydraulic cylinder 27.

The hydraulic cylinders 25, 26, and 27 are each provided with a rolling control device 40 that controls the flow rate and pressure of pressure oil supplied thereto. The rolling control device 40 is equipped with an input setting device 41 for inputting the dimensions of the material 10, the dimensions of the different diameter steel bar 11, etc., and the signals inputted to the input setting device 41 are given to the /i1 calculation control device 42. The arithmetic and control unit 42 controls three sets of hydraulic cylinders 25.2 provided for each roll based on input signals.
6 and the pressure and flow rate of the pressure oil supplied to the hydraulic cylinder 27 for rotating the rotary housing.
A subtractor 43 is provided for each hydraulic cylinder 27. ... to the servo amplifier 44. It is designed to be given to... Servo amplifier 44. ... is a servo valve 4 installed in the middle of a pipe (not shown) through which pressure oil flows.
5. ... and supplies pressure oil to three sets of hydraulic cylinders 25, 26 and another hydraulic cylinder, cylinder 27.

Each servo valve 45. ... has a speed displacement meter 46. ... is provided, and a speed displacement meter 46. . . . measures the oil amount and sends the measurement signal to the servo amplifier 44. The flow rate of pressure oil is controlled by applying it to...

In addition, the hydraulic cylinders 25, 26, 27 have pressure sensors 4.
7,... are attached, and the pressure sensor 47.・・・
- Measures the hydraulic pressure in the hydraulic cylinder, and applies the measured signal to the subtractor 43 via the pressure amplifier 48 to perform pressure control. Furthermore, the entry and exit chocks 23,24 and the hydraulic cylinder 2 are actuated by the hydraulic cylinders 25,26.
A position sensor 49 is attached to each cylinder rod of position sensor 49.7. ... is the entry side.

Advancement of exit chock 23, 24 and cylinder rod.

The amount of work is measured and a measurement signal is given to the arithmetic and control unit 42. The arithmetic and control device 42 includes a position sensor 49 . If the input signal from . . . differs from the cylinder rod advance and machining amount settings, a compensation signal is sent to the servo amplifier 44 so that they match. ... to control the hydraulic cylinders 25 and 26.

The three rolls 1, 2.3 have a gorge portion 1a in the center.

2a and 3a (see Fig. 4), and the entrance side of the material 10 with this gorge as a border includes entrance side inclined parts 1b, 2b, and 3b whose diameters are gradually reduced toward the shaft end, and A reeling part 1c whose diameter is gradually enlarged toward the exit end.
, 2c, and 3c, followed by outlet inclined portions 1d, 2d, and 3d whose diameters are gradually reduced. still,
In the reeling parts 1c, 2c, and 3c, the distance from the pass line is made to match the distance between the gorge part and the pass line.

Each of the rolls 1, 2.3 having such a shape has its inlet inclined portions 1b, 2b, 3b located upstream in the direction of movement of the material 10, and the axial center line Y-Y, the gorge portion 1a, 2a and 3a (hereinafter referred to as the roll setting center) are arranged to be located at approximately equal intervals around the bus line XX on the same plane perpendicular to the pass line XX of the material 10. It is set up. The axial center line Y-Y of each roll 1, 2.3 is centered around the roll setting center, and the front axis end is located at the pass line X-X as shown in FIG. are crossed (inclined) by a crossing angle T so as to approach toward
figure.

As shown in FIG. 6, the front shaft end is inclined toward the same side in the circumferential direction of the material 1O by an inclination angle β.

The intersection angle γ and the inclination angle β are determined by three hydraulic cylinders 25.
It is adjusted by advancing and retracting the cylinder rods 26 and 27. In particular, the crossing angle T is mainly adjusted by the hydraulic cylinders 25 and 26, and the inclination angle β is mainly adjusted by the hydraulic cylinder 27, respectively.

However, β and γ are within the ranges specified below for rolling purposes.

0° γ<15°3°<β<20°5°<T+β<25° The values of β and γ above are determined based on the dimensions of the material 10 and the different diameter rod &H11, and the relationship between the two is determined by the arithmetic and control device. 42 as a table, and when the dimensions of the material 10 and the different diameter steel bar 11 are input, the arithmetic and control unit 42 can read out β and γ from the table.

The rolls 1.2.3 are connected to a drive source (not shown) and are driven to rotate in the same direction as shown by arrows in FIG. 5, and the hot material 10 caught between these rolls is It is rotated around the core edge and moved in the axial direction, that is, it is moved in a spiral manner.

A tachometer generator 50 is attached to the shaft 1e of the roll 1, and a length signal detected by the tachometer generator 50 is given to an arithmetic and control unit 42 to measure the rolled length.

Optical thermometers 51 and 52 such as radiation thermometers are provided with side temperature fields facing the moving areas of the steel bars 11 of different diameters on the upper and downstream sides of the rolls 1 and 2.3, respectively. 52 measures the temperature of the material 10 and the temperature of the different diameter steel bar 11, respectively, and outputs a 11 constant signal to the arithmetic and control device 42 of the rolling control device 40.

When the temperatures at the entrance and exit sides of the roll are input, the arithmetic and control unit 42 estimates the deformation resistance of the material 10 based on this, and performs an analytical analysis using the estimated value and the finite element method set in advance. Based on the mill stiffness curve obtained in
The forward/backward change amount is calculated based on the signal regarding the forward/backward amount of No. 4, and a control signal corresponding to the calculated value is sent to each servo amplifier 44.
．． Output to...

The method of the present invention, which is carried out using the inclined rolling mill configured as described above, will be explained below.

First, the dimensions of the different diameter steel bar shown in Fig. 7, that is, the outer diameter of the large diameter part: I) o, the length of the large diameter part: Lo, and the outer diameter of the small diameter part:
Dl, length of small diameter part: L1. Angle formed with the axis of the inclined surface whose diameter decreases from the large diameter part to the small diameter part: α.

Angle formed with the axis of the inclined surface whose diameter increases from the small diameter part to the large diameter part: α2. The number of small diameter parts and large diameter parts and the outer diameter of the material 10,
The length etc. are input from the input setting device 41 to the arithmetic and control unit 42 .

The arithmetic and control unit 42 stores the input signal and reads out the set values of β and γ when rolling the small diameter portion based on the input signal and the table set in advance for the input signal.
The control signal is sent to all servo amplifiers 44. ... to adjust the amount of movement of each cylinder rod of the hydraulic cylinders 25, 26, 27. As a result, β and γ become set values, and the distance between the pass line and the roll becomes D1/2.

When this operation is completed, the rolls 1.2.3 are rotated and the material 10 is fed. As a result, material 1
0 is rolled to form a small diameter portion having an outer diameter of Dl.

Based on the signal from the tacho generator 50, when the rolling length of the large diameter portion reaches Ll, the arithmetic and control unit 42 controls both the entrance and exit chocks 23 and 24 according to the rolling length when rolling a predetermined length. The same amount will be withdrawn in a proportional relationship. As a result, an inclined surface having an angle α2 is formed. However, the amount of chock movement is (D.

-DI)/2 does not match. Here, the reason will be explained.

Originally, the mill settings were the opening of the inlet and outlet chocks and the inlet and outlet chocks.
This is done by adjusting the relative rotation angle of the exit housing to obtain a predetermined roll inclination angle, crossing angle, and set outer diameter at the gorge. However, controlling three set values simultaneously is complicated and impractical. The description here is based on the assumption that the input and output chips are moved by the same amount at the same time. Therefore, in this case, even if the chock is moved by the same amount (1) on the input and output sides, the outer diameter set at the gorge portion does not change by 2.

An example is shown in FIG.

In Figure 8, the horizontal axis shows the amount of movement of the chock in the opening direction from the reference position, and the vertical axis shows the amount of increase in the outer diameter of the different diameter steel bar and the IIFi angle β.
FIG. 3 is a diagram showing the relationship between the four values, taking the amount of change in the intersection angle γ and the amount of change in the intersection angle γ. As can be understood from this figure, when the chock is moved in the opening direction from a certain setting value, β and γ increase as shown by the dashed line and -dotted chain line, respectively.For example, when the chock is moved away from the lO Tsuru pass line, the chock is Even if the opening degree is increased by 201 on the inlet and outlet sides, the increase in outer diameter (solid line) will not be 20 dragons, but will be slightly smaller than that. Therefore, when changing to D, -'D, the movement amount of the chock is (Do -DI)/2+Δt(Δt
: positive variable). However, Δt is determined by functions such as the reference setting outer diameter D1, the roll inclination angle/crossing angle, and the relative positional relationship between the gorge portion and the chock.

For the reason mentioned above, the amount of movement of the chock is (Do DI )/2+ΔL based on the signal from the position sensor 49.
When it reaches , it is kept constant. This makes the outer diameter Do
A large diameter portion is formed.

Thereafter, when the rolling length of the large diameter portion becomes LD based on the signal from the tachogenerator 50, the arithmetic and control unit 42 determines that the distance between the pass line and the roll increases by /2 when rolling is performed for a predetermined length. Iri side so that it becomes.

, the outlet chocks 23 and 24 are both advanced by the same amount in proportion to the rolling length. As a result, an inclined surface having an angle α1 is formed.

Then, based on the signal from the position sensor 49, the distance between the pass line and the roll reaches D1/2.

/2, and thereafter similar control is repeated depending on the number of small diameter parts and large diameter parts.

In the above embodiment, the initial reference setting value is set to the small diameter portion, but in the present invention, the reference setting value may be set to the large diameter side, or may be set to an arbitrary position in between.

The steel bar 11 with different diameters manufactured in this way has a shaft 1e, a
Because there is almost no deflection in 2g and 3e, and because pressure is controlled by hydraulic pressure for reasons explained later, the dimension 18
Excellent degree.

The reason for performing the above-mentioned hydraulic reduction control is that the moment of inertia is large in the conventional electric reduction method that combines an electric motor, reduction gear, and reduction screw, and the power transmission efficiency of the reduction screw is low. This is to solve the problem of poor response speed.

In the above example, the steel bar is manufactured using an inclined rolling mill equipped with three rolls, but the present invention is not limited to this. It is possible to manufacture steel materials with different diameters such as

[Numerical example]

Using a material with an outer diameter of 50s-φ, there are 3 small diameter parts and 4 large diameter parts, Do: 40mφ, D1: 20n+φ
.

Lo: 301m, L+: 200m,
α 1 and α 2 : Numerical examples are shown when steel bars with different diameters of 45° are manufactured by the method of the present invention. The manufacturing conditions for the large diameter part are roll opening: 40 φ, T: 3°, β
: 15°, roll rotation speed (rolling speed): 1001
00 rpm, 16 m/sec), and the roll opening degree of the small diameter part was: 2 o dragon φ, r: 2.8°, β: 13°, and the chock movement amount at that time was 10.5 m. Other conditions include: outer diameter of the gorge part of the roll: 120mmφ;
Roll material: SCM445. Heating temperature for material 10:
1200'l:, Material 10 (7) Material: 545 (, Te was.

〔effect〕

As described in detail above, in the case of the present invention, an inclined rolling mill having three or four double-supported rolls and controlling the reduction by hydraulic pressure is used, so that the material progresses as it is rolled.
This provides an excellent effect in that bars of different diameters with good dimensional accuracy can be manufactured regardless of length.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view (view taken along line 1-1 in Fig. 2) showing the implementation state of the present invention, Figs. 2 and 3 are front and rear views thereof, and Fig. 4 is a view of the vicinity of the roll. 5 is a front view taken along the line V-V in FIG. 4, FIG. 6 is a side view showing the inclination angle β, and FIG. 7 is a dimensional explanatory diagram for manufacturing a steel bar with different diameters. Figure 8 shows the movement of the chock and the small diameter section of the steel bar with different diameters.
FIG. 9 is an explanatory diagram of the relationship with changes in the outer diameter of the large diameter portion, etc., and is an explanatory diagram of the prior art. 1, 2. 3-0-ru Ie, 2e, 3e...axis
10-...Material 11...Steel bar with different diameter 23...Inlet chock 24Outlet side chock 25, 26.27...
Hydraulic cylinder patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Noboru Kono 5th Gll? 4'7tl Chia-1'7I) Between self] Progress amount (mm) 1st circle

Claims (1)

[Scope of Claims] 1. A method for manufacturing a bar material with different diameters whose outer diameter differs depending on the position in the axial direction by processing a cylindrical material, which includes three or four rolls facing around the pass line. Then, an inclined rolling mill is used in which the axis of each roll is supported on both sides of the roll, and the distance between the roll and the pass line can be adjusted by hydraulic pressure, and the distance can be adjusted when processing the material. 1. A method for producing bars of different diameters, the method comprising producing bars of different diameters.