JPH06335743A - Form-rolling device provided with tie-bar - Google Patents

Abstract

PURPOSE:To provide a form-rolling device with a tie-bar in which the opening of opposing frames is restrained when a material is form-rolled and by which the accuracy of form-rolling is further improved. CONSTITUTION:This device is provided with a main body 1 having a couple of opposing frames 11, a movable frame having a form-rolling die 25 and a tie-bar 3 by which expanding of distance between opposing frames is prevented. A main wedge part 4 is inserted between the rear surfaces 11b of opposing frames 11 and the end part 30 of tie-bar 3. A spacer 5 is arranged between the opposing surfaces 11a of couple of opposing frames 11. A sub wedge part 7 is inserted between the opposing surfaces 11a of opposing frames 11 and the end surface of spacer 5. Consequently, the spacer 5 is deformed by pressure and the tie-rod 3 is deformed by tensile force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling device equipped with a tie bar.

[0002]

2. Description of the Related Art Conventionally, as a rolling device provided with a tie bar, as shown in FIGS. 4 and 5, a main body 101 having a pair of opposed frames 100 facing each other with a space therebetween.
And a pair of movable frames 201 which are slidably held on the respective facing surfaces 100a of the facing frame 100 and hold the rolling die 200, and a tie bar 300 which prevents the distance between the facing frames 100 from expanding. Has been.

In this apparatus, the rolling die 200 operates in the direction of the arrow A1 together with the movable frame 201 to roll the work W. Opposing frame 1 due to reaction force during rolling
00 is urged in the opening direction. In order to ensure the accuracy of the rolling process, the opening amount of the opposing frame 100 is preferably small. Therefore, in the rolling device described above, the tie bar 30
0 is integrated with the anvil part 300f to face the opposite frame 100.
It is placed between the tie bars 300 and the anchor 30
0f and the facing surface 100a of the facing frame 100, the spacer 500 is interposed, and further, the wedge portion 400 is inserted between the end portion 302 of the tie bar 300 and the back facing surface 100b of the facing frame 100. Frame 10
Holds the zero gap. In this device, the tie bar 300
Is basically not set in a tensioned state.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a further technical advance of the above-mentioned device, and its object is to suppress the opening of the opposite frame more than the above-mentioned device.
It is an object of the present invention to provide a rolling device equipped with a tie bar that can further improve the precision of rolling.

[0005]

A rolling device provided with a tie bar according to the present invention is slidably mounted on a main body having a pair of opposing frames facing each other with a space therebetween, and on each opposing surface of the opposing frame. A set of movable frames that are held and hold the rolling die, a tie bar whose both ends press the back-to-back surfaces of the facing frames facing each other and prevent the distance between the facing frames from widening, and the facing surface of the facing frames. Provided on at least one of the spacer sandwiched between the two, the back surface of the one opposing frame and the end of the tie bar that presses the back surface, and the opposing surface of the one opposing frame and the spacer. And a widening means for urging the one space in a direction to widen the one space.

The widening means can be composed of, for example, a wedge portion and a hydraulic drive portion driven by hydraulic pressure.

[0007]

In the device of the present invention, the widening means causes the tie bar to be tensilely deformed, the spacer to be compressed and deformed, and the interval between the opposing frames is displaced. Now, let this displacement be λ _1, and let the drag force with respect to a predetermined portion of the tie bar, the spacer and the opposite frame be F _t , F
_{Given s} and F _f , the following equation holds.

F _t × λ ₁ = F _s × λ ₁ + F _f × λ ₁ =
(F _s + F _f ) λ ₁ The rolling process is performed in this state. It is assumed that a maximum P force is required for the rolling process, and at that time, the interval between the opposing frames opens to λ ₂ . At this time, (F _s + F _f ) (λ ₁ −λ ₂ ) + P = F _t (λ ₁ + λ
₂ ) P = F _t λ ₂ + (F _s + F _f ) λ ₂ = (F _t + F _s + F _f ) λ ₂ .

That is, in the rolling process, not only the rigidity of the tie bar and the opposing frame but also the spacer is involved in the force for maintaining the interval between the opposing frames, and the rigidity of the spacer is added. Therefore, if the force P required for the rolling process is constant, the displacement of the interval between the opposing frames is reduced by the addition of the spacer. Displacement of the counter frame that occurs when pre-tensioning and pre-compressing the tie bar and the spacer can be solved by providing a sub wedge portion between the counter frame and the spacer to absorb the displacement of the counter frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rolling device equipped with a tie bar according to the present invention will be described below with reference to the embodiments shown in FIGS. This device includes a main body 1, a movable frame 2, a tie bar 3, a main wedge portion 4 as a widening means, and a spacer 5.

The main body 1 has a lower base portion 10, a pair of opposing frames 11 standing upright from the lower base portion 10, and a ceiling portion 12 connecting the upper portions of the respective opposing frames 11 in series. The opposing frames 11 are opposed to each other with a space therebetween. The movable frame 2 is held on each of the facing surfaces 11a of the facing frame 11 and is slidable in the arrow B1 direction and the arrow B2 direction. A rolling die 25 for rolling the work W is held on each of the movable frames 2.

The tie bar 3 prevents the interval between the opposing frames 11 from expanding. The tie bar 3 is made of metal and has an end portion 30 and an intermediate portion 3 extending between the end portions 30.
It is formed with 2. The end portion 30 of the tie bar 3 faces the back surface 11b of each opposing frame 11. The main wedge portion 4 is inserted between the back surface 11 b of one facing frame 11 and the end portion 30 of the tie bar 3. Main wedge part 4
Is to urge the pair of opposing frames 11 in a direction to reduce the distance between them. The main wedge portion 4 is prevented from coming off by the head portion of the first bolt 45 held by the end portion 30.

The spacer 5 is made of metal and is arranged between the facing surfaces 11a of the pair of facing frames 11. Further, in this embodiment, the sub-wedge portion 7 is inserted between the facing surface 11 a of the facing frame 11 and the end surface of the spacer 5. The sub-wedge portion 7 urges the pair of opposing frames 11 in a direction to increase the distance between them. As a result, the facing frame 11 is set to the neutral position in the state where the rolling process is not performed. The sub wedge portion 7 is prevented from coming off by the head of the second bolt 75 held by the spacer 5.

During the rolling process, the work W is chucked by the chuck 8
In the state of being held at 0, the rolling die 25 operates in the direction of the arrow B1 together with the movable frame 2 and approaches each other, and the die surface portion of the rolling die 25 is transferred to the outer peripheral surface of the work W. During such a rolling process, the opposing frame 11 is biased in the opening direction. By the way, in the present embodiment, when the main wedge portion 4 is inserted, the tie bar 3 is tensilely deformed, the spacer 5 is compressively deformed, and the opposing frame 11 is displaced in the direction in which the interval is narrowed. Now, let this displacement be λ _1, and let the drag force on the tie bar 3, the spacer 5 and the predetermined portion of the opposing frame 11 be F.
_{Given t} , F _s , and F _f , the following equation holds.

F _t × λ ₁ = F _s × λ ₁ + F _f × λ ₁ =
(F _s + F _f ) λ ₁ Rolling is performed in this state. It is assumed that a maximum P force is required for the rolling process and the interval between the opposing frames 11 is opened to λ ₂ . At this time, (F _s + F _f ) (λ ₁ −λ ₂ ) + P = F _t (λ ₁ + λ
₂ ) P = F _t λ ₂ + (F _s + F _f ) λ ₂ = (F _t + F _s + F _f ) λ ₂ .

That is, in the rolling process, the opposing frame 11
The force to maintain the space between the tie bar 3 and the opposing frame 1 is
In addition to the rigidity of 1, the spacer 5 is involved,
The rigidity of is added. Therefore, if the force P required for the rolling process is constant, the spacer 5 is added and the opposing frame 11 is added.
The displacement of the interval is reduced. Therefore, in this embodiment, it is advantageous to suppress the opening of the opposing frame 11, and the precision of the rolled product is ensured.

Further, in the present embodiment, a sub wedge portion 7 is used in addition to the main wedge portion 4, and the sub wedge portion 7 is one counter frame 1
Since it is inserted between the facing surface 11a of No. 1 and the end surface of the spacer 5, it is advantageous to bring the spacer 5 into a compressed state. (Other example) Although the spacer 5 is made of metal, the rigidity of the spacer 5 contributes, so the spacer 5 can be made of ceramics having a large elastic modulus.

In the above-described example, the tie bar 3 is provided on only one side in the width direction of the opposing frame 11 as shown in FIG. 1, but the invention is not limited to this, and as in another example shown in FIG.
The tie bar 3, the main wedge portion 4, the sub wedge portion 7, and the spacer 5 can also be provided on the other side of the opposing frame 11 in the width direction.

[0019]

According to the apparatus of the present invention, it is advantageous to prevent the opposing frame from opening during the rolling process. Therefore, the precision of the rolling relationship, for example, the gear diameter relationship (pitch diameter,
This is advantageous for improving the accuracy of single pitch, cumulative pitch, etc.) and tooth width.

[Brief description of drawings]

FIG. 1 is a view taken along the line S-S of FIG.

FIG. 2 is a side view of the device.

FIG. 3 shows another embodiment and is equivalent to FIG.

FIG. 4 is a view taken along the line TT of FIG.

FIG. 5 is a side view of a conventional device.

[Explanation of symbols]

In the figure, 1 is a main body, 11 is a facing frame, 2 is a movable frame, 25 is a rolling die, 3 is a tie bar, 30 is an end portion, 4 is a main wedge portion, 5 is a spacer, and 7 is a sub wedge portion.

Claims (1)

[Claims] 1. A main body having a pair of opposing frames facing each other with a space therebetween, and a pair of movable frames slidably held on the respective facing surfaces of the facing frame to hold a rolling die. A tie bar whose both ends press the back-to-back surfaces of the facing frames facing each other to prevent the distance between the facing frames from widening; and a spacer sandwiched between the facing surfaces of the facing frames, 1 Between the back surface of the opposing frame and the end of the tie bar that presses the back surface, and between at least one of the facing surface of the opposing frame and the spacer, A rolling device provided with a tie bar, comprising: a widening means for urging the space in the direction of widening.