JP2860040B2 - Rolling equipment with tie bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling device provided 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 provided with a pair of opposed frames 100 facing each other at an interval.
And a tie bar 300 that is slidably held on each opposing surface 100a of the opposing frame 100 and holds the rolling die 200, and a tie bar 300 that prevents the interval between the opposing frames 100 from widening. Have been.

In this apparatus, the rolling die 200 is operated together with the movable frame 201 in the direction of arrow A1 to roll the workpiece W. Opposing frame 1 due to reaction force during rolling
00 is biased in the opening direction. In order to secure the accuracy of the rolling process, it is preferable that the opening amount of the opposing frame 100 is small. Therefore, in the above-described rolling device, the tie bar 30
0 and the soldering part 300f integrated with the counter frame 100
The tie bar 300 is disposed between the
0f and the opposing surface 100a of the opposing frame 100 with a spacer 500 interposed therebetween, and further, a wedge portion 400 is inserted between the end 302 of the tie bar 300 and the back facing surface 100b of the opposing frame 100. Frame 10
The opening of 0 is suppressed. In this device, a tie bar 300
Is basically not set in a tensile state.

[0004]

SUMMARY OF THE INVENTION The present invention is a further technical advance of the above-described device, and its object is to suppress the opening of the opposing frame more than the above-described device.
An object of the present invention is to provide a rolling device provided with a tie bar that can further improve the accuracy of the rolling process.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rolling device provided with a tie bar, comprising: a main body having a pair of opposed frames facing each other at a distance from each other; A pair of movable frames that are held to hold the rolling dies, tie bars whose opposite ends press against the opposing surfaces of the opposing frames that oppose each other, and prevent the interval between the opposing frames from widening; The spacer is provided between at least one of the spacer interposed therebetween and the back surface of the one opposing frame and the end of the tie bar that presses the back surface, and between the opposing surface of the one opposing frame and the spacer. And a widening means for urging in a direction to widen the one interval.

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

[0007]

In the apparatus of the present invention, the tie bars are tensile-deformed by the widening means, the spacers are compressed and deformed, and the distance between the opposing frames is displaced. Now, let this displacement be λ _1, and the drag force on the tie bar, the spacer and the predetermined portion of the opposing frame be F _t , F
_{Assuming s} and F _f , the following equation is obtained.

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 the rolling process requires a maximum force of P, at which time the interval between the opposing frames increases 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) the lambda _2.

That is, the force for maintaining the interval between the opposing frames in the rolling process involves not only the rigidity of the tie bar and the opposing frame but also the spacer, and the rigidity of the spacer is added. Therefore, assuming that 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. In addition, the displacement of the opposing frame that occurs when the pre-tension and the pre-compression are applied to the tie bar and the spacer can be solved by providing a sub-wedge between the opposing frame and the spacer to absorb the displacement of the opposing frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rolling device provided with a tie bar according to the present invention will be described below with reference to an embodiment 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 10, a pair of opposing frames 11 erected from the lower base 10, and a ceiling 12 connecting the upper portions of the opposing frames 11. The opposing frames 11 oppose each other with an interval therebetween. The movable frame 2 is held on each opposing surface 11a of the opposing frame 11, and is slidable along the directions of the arrows B1 and B2. Each of the movable frames 2 holds a rolling die 25 for rolling the work W.

The tie bar 3 prevents the interval between the opposing frames 11 from increasing. 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.
2 are formed. The end 30 of the tie bar 3 faces the rear facing surface 11 b of each of the opposing frames 11. The main wedge portion 4 is inserted between the back-facing surface 11 b of the one opposing frame 11 and the end 30 of the tie bar 3. Main wedge part 4
Is to urge the pair of opposed frames 11 in a direction to reduce the interval. The main wedge 4 is prevented from coming off by the head of the first bolt 45 held at the end 30.

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

In the rolling process, the work W is held by the chuck 8
In the state of being held at 0, the rolling die 25 moves together with the movable frame 2 in the direction of arrow B1 to approach each other, and the die surface portion of the rolling die 25 is transferred to the outer peripheral surface of the work W. At the time of such a rolling process, the opposing frame 11 is urged in the opening direction. By the way, in this embodiment, when the main wedge portion 4 is inserted, the tie bar 3 undergoes tensile deformation, the spacer 5 undergoes compressive deformation, and the opposing frame 11 is displaced in a direction in which the distance therebetween is reduced. Now, let this displacement be λ _1, and let the tie bar 3, the spacer 5, and the opposing frame 11
_{Assuming t} , F _s and F _f , the following equation is obtained.

F _t × λ ₁ = F _s × λ ₁ + F _f × λ ₁ =
_{(F s + F f) λ} 1 to rolling in this state. It is assumed that a maximum P force is required for the rolling process, and at this time, 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) the lambda _2.

That is, in the rolling process, the facing frame 11 is formed.
The tie bar 3 and the opposing frame 1
1 as well as the spacer 5
Stiffness is added. Therefore, assuming that the force P required for the rolling process is constant, only the spacer 5 is applied to the facing frame 11.
The displacement of the interval is reduced. Therefore, in the present embodiment, it is advantageous to suppress the opening of the opposing frame 11, and the accuracy of the rolled product is ensured.

Further, in this embodiment, a sub wedge 7 is used in addition to the main wedge 4, and the sub wedge 7 is
Since it is inserted between the first opposing surface 11a and the end face of the spacer 5, it is advantageous to make the spacer 5 in a compressed state. (Other Example) Although the spacer 5 is made of metal, the rigidity of the spacer 5 contributes. Therefore, the spacer 5 can be made of ceramic 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 facing frame 11 as shown in FIG. 1. However, the present invention is not limited to this, and as shown in FIG.
The tie bar 3, the main wedge part 4, the sub wedge part 7, and the spacer 5 can also be provided on the other side in the width direction of the opposing frame 11.

[0019]

According to the apparatus of the present invention, it is advantageous to suppress the opening of the opposing frame during rolling. Therefore, the accuracy of the diameter relationship of a rolled product such as a gear (pitch diameter,
This is advantageous in improving the accuracy of single pitch, cumulative pitch, etc.), tooth width and the like.

[Brief description of the drawings]

FIG. 1 is a view taken along line SS in FIG. 2;

FIG. 2 is a side view of the device.

FIG. 3 shows another embodiment, and is a view corresponding to FIG.

FIG. 4 is a view taken along line TT of FIG. 5;

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

[Explanation of symbols]

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

Claims (1)

(57) [Claims] A main body including a pair of opposed frames facing each other at an interval; a set of movable frames slidably held on each of the opposed surfaces of the opposed frames to hold a rolling die; A tie bar whose both end portions press against the opposing back-facing surfaces of each of the opposing frames to prevent the interval between the opposing frames from widening; a spacer sandwiched between the opposing surfaces of the opposing frames; And at least one between the facing surface of the opposed frame and the end of the tie bar pressing the facing surface and between the facing surface of the opposed frame and the spacer. A rolling device provided with a tie bar, comprising: a widening means for urging in a direction to widen the gap;