JP2503728Y2 - Wire forming roll - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod forming roll in which a roll body is integrally fitted to an arbor.

[0002]

2. Description of the Related Art As shown in FIG. 6, a wire rod forming roll R'has a roll body 42 integrally fitted in an arbor 41. By arranging them and rotating them inversely to each other, the wire L is inserted between the annular forming grooves 43 provided on the outer circumference of each roll body 42 to perform the forming. Since the forming groove 43 of the roll body 42 is depressed due to long-time use and its shape is collapsed, the roll body 42 is used after being replaced for a predetermined time.

Since the roll body 42 is required to have a high hardness due to its action, it is made of cemented carbide or tool steel. Therefore, as a means for fitting the roll body 42 into the arbor 41 and fixing it in a non-rotatable manner, it is actually opened.
Using a key as disclosed in Japanese Laid-Open No. 5-18703
Then, stress concentration occurs in the keyway part, causing cracking.
Will end up. Therefore, the technology disclosed in the above publication is
"It has an outer sleeve and a recess (key groove) on the inner peripheral surface.
And a sleeve core body fitted inside the outer sleeve,
By shrink-fitting, and by shrink-fitting the sleeve core body
The compressive residual stress applied to the
It is intended to prevent cracks in the groove portion. " Shi
However, the outer sleeve and sleeve core are integrated into one
The keyway is provided on the inner surface of the "Leave",
Since it is exactly the same as the conventional sleeve, is it the keyway part?
These cracks may be less likely to occur, but these cracks
Cannot be completely prevented.

For this reason , as a means for fitting the roll body 42 into the arbor 41 and integrating them, shrink fit is often used . However, at the time of molding, the roll body 42 is heated by the molding heat and expands.
The shrink-fitting of the roll body 42 against the roll body may be loosened, and the roll body 42 may rotate with respect to the arbor 41. If this happens, the wire L cannot be molded. Therefore, the roll body fitting portion of the arbor 41 and the roll body 4
When the shape of the second hole is elliptical, the roll body 42 can be prevented from rotating with respect to the arbor 41 even if the roll body 42 is thermally expanded. However, when this is done, a slight pulsation occurs every half rotation of the roll body, which impairs the rotational balance of the forming roll and adversely affects the forming accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention prevents the roll body from rotating with respect to the arbor even when the roll body expands due to molding heat, and also improves the rotational balance of the roll body to improve the molding accuracy. The problem was to prevent the decrease of

[0006]

SUMMARY OF THE INVENTION According to the present invention, a roll body integrally fitted with an arbor is arranged as a one-to-one pair so as to face each other, and these rolls are rotated in reverse to each other. A wire rod forming roll configured to pass a wire rod between each annular forming groove provided on the outer peripheral surface, the cross-sectional shape of a portion of the arbor into which the roll body is fitted, A bulged portion having the same shape is provided at three equally divided positions along the circumferential direction to form a non-circular shape constituted by a continuous curve all around , and the shape of the hole portion of the roll body is changed to the arbor. The roll body fitting portion is formed so as to correspond to the non-circular shape, and the roll body is shrink-fitted and fixed to the roll body fitting portion of the arbor.

[0007]

[Operation of the device] In the roll body fitting portion in the arbor,
When a roll body having a hole shape corresponding to the cross-sectional shape of the part is fitted by shrink fitting to be integrated and the wire body is formed by rotating this roll body, the cross-sectional shape of the roll body fitting part of the arbor is obtained. However, the cross-sectional shape of the roll body fitting portion of the arbor is circular because it has a non-circular shape with bulging portions of the same shape provided at three positions along the circumferential direction on the outer circumference of the basic circle. Or, it can rotate smoothly in almost the same state as in the case close to this, and the wire can be formed with high accuracy, and even if the roll expands due to the forming heat, the roll does not rotate with respect to the arbor. . Further, since the shrink fit of the roll body to the arbor may be performed to such an extent that the roll body does not move in the axial direction due to thermal expansion, the removal of the roll body from the arbor becomes easy. Also, low
The cross-sectional shape of the hole in the ruler body is
Corresponding to the cross-sectional shape of
It has a non-circular cross section, so it may have a non-circular cross section.
However, there is no notch where stress concentration occurs,
The crack of the roll body will not occur.

[0008]

EXAMPLES The present invention will be described in more detail below with reference to examples. FIG. 1 is a front view of a wire rod forming roll R according to the present invention, FIG. 2 is a front view of a state before a roll body 20 is fitted into an arbor 10, and FIG.
It is a line expanded sectional view, and FIG. 4 is an YY line expanded sectional view of FIG. In the arbor 10, only the roll body fitting portion 11 into which the roll body 20 is fitted has a non-circular cross-sectional shape, and the other portions have a circular cross-sectional shape. In FIG. 2, (L) is a roll body fitting portion 1 of the arbor 10.
1 has a length of 1, and a flange portion 12 is provided at one end thereof. As shown in FIG. 4, the cross-sectional shape of the roll body fitting portion 11 of the arbor 10 is a bulge portion having the same shape at a position divided into three equal parts along the circumferential direction on the outer circumference of the basic circle A _1. 11a is provided, and the entire circumference is a continuous curve
It has a non-circular structure . That is, the three bulges 1
The circumscribing circle A _{2 of} 1a is concentric with the basic circle A ₁ . In FIG. 4, C ₀ indicates the center of the basic circle A ₁ .

The roll body 20 has a cylindrical shape, and the cross-sectional shape of the hole portion 21 corresponds to the cross-sectional shape of the roll body fitting portion 11 of the arbor 10 and is a curved line whose entire circumference is continuous.
Is formed into a non-circular shape, and three annular molding grooves 22 having a semi-elliptical cross section are formed on the outer peripheral surface thereof.

The arbor 10 is machined by shaving, and in order to improve the material yield, a ring body 31 is shrink-fitted to the collar portion 12 to secure a predetermined outer diameter. . Then, the roll body fitting portion 1 of the arbor 10
In order to fit the roll body 20 into the roll body 20 so that the roll body 20 is integrated, the roll body 20 is fitted into the roll body fitting portion 11 with the roll body 20 heated to a predetermined temperature and cooled by shrink fit. The shrink-fitting temperature of the roll body 20 may be such that the roll body 20 does not move in the axial direction of the arbor 10 due to expansion due to molding heat. If so, the temperature may be low. In this way, after shrink-fitting the roll body 20 on the arbor 10, the ring body for preventing the roll body 20 from moving in the axial direction at the portion connected to the roll body fitting portion 11 of the arbor 10. Shrink 32.

Then, as shown in FIG. 5, a pair of wire rod forming rolls R having the above-described structure are arranged so as to face each other, and these are rotated in reverse to each other so that the gap between the forming grooves 22 of each roll body 20 is increased. The wire L is passed through and the molding is performed. Here, since the wire rod body fitting portion 11 of the arbor 10 has a non-circular cross-sectional shape as described above, and the phases of the three bulging portions 11a along the circumferential direction are shifted by 120 °. In addition, the bulging portion 11a is not located at a position symmetrical with respect to the rotation axis of the wire rod forming roll R [same as the center (C ₀ ) of the basic circle A ₁ ]. As a result, the rotation balance of the wire forming roll R is improved, and the roll body fitting portion 11 of the arbor 10 smoothly rotates in a state similar to the case where the cross-sectional shape of the roll body fitting portion 11 is circular or close to this. The molding accuracy does not decrease. In this respect, when the roll body fitting portion 11 of the arbor 10 has an elliptical cross-sectional shape, two portions corresponding to the bulging portion in the above-described embodiment are
Since the wire rod is symmetrically positioned with respect to the axis of rotation of the wire rod, this is different from the fact that a small pulsation occurs every 180 ° rotation of the wire rod.

Further, the roll body 20 can be used for a long time.
When the shape of the forming groove 22 is broken, the roll body 20 is removed from the arbor 10. However, the shrink fit temperature of the roll body 20 is low due to the above-mentioned reason, and the shrink fit stress generated is also generated. Due to its small size, the removal of the roll body 20 from the arbor 10 is relatively easy.

[0013]

The wire forming roll according to the present invention has a cross-sectional shape of a portion of the arbor into which the roll body is fitted.
A bulged portion of the same shape is provided at a position that is divided into three equal parts along the circumferential direction on the outer circumference of the basic circle, and the entire circumference is formed by a continuous curve.
Formed into a non-circular shape, and the shape of the hole portion of the roll body is formed so as to correspond to the non-circular shape of the roll body fitting portion of the arbor, and the roll body is rolled into the roll body fitting portion of the arbor. Since the body is shrink-fitted and fixed, the structure prevents the roll body from rotating with respect to the arbor even when the roll body expands due to the molding heat. It is possible to prevent a decrease in accuracy. Further, since the shrink-fitting temperature of the roll body with respect to the arbor is lower than the normal shrink-fitting temperature and the shrink-fitting stress is small, it is necessary to remove the roll body from the arbor at the time of replacement of the roll body. Easy to do with relatively little force. In addition, the cross-sectional shape of the hole of the roll body is
Corresponding to the cross-sectional shape of the roll fitting part , the entire circumference is continuous.
Since it is a non-circular shape composed of curved lines,
Notch where stress concentration occurs even though it is a surface
Is eliminated and the roll body is not cracked.

[Brief description of drawings]

FIG. 1 is a front view of a wire rod forming roll R according to the present invention.

FIG. 2 is a front view showing a state before the roll body 20 is fitted into the arbor 10.

FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 4 is an enlarged sectional view taken along line YY of FIG.

FIG. 5 is an operation explanatory view of the wire rod forming roll R according to the present invention.

FIG. 6 is an explanatory view of the action of the wire rod forming roll.

[Explanation of symbols]

A ₁ : Basic circle of the cross section of the roll body fitting part of the arbor A ₂ : Circumscribing circle of the cross section of the roll body fitting part of the arbor R: Wire rod forming roll 10: Arbor 11: Roll body fitting part 11a: Roll body fitting Swelling portion of the recessed portion 20: Roll body 22: Forming groove

Claims (1)

(57) [Scope of utility model registration request] 1. An annular arbor provided on the outer peripheral surface of each roll body by disposing the roll bodies integrally fitted to the arbor in a one-to-one pair so as to face each other and rotating them in opposite directions. A wire rod forming roll configured to pass a wire rod between each of the forming grooves, wherein the cross-sectional shape of a portion of the arbor into which the roll body is fitted is divided into three equal parts along the circumferential direction on the outer circumference of the base circle. Curved line where the entire circumference is continuous with bulging parts of the same shape
The non-circular shape of the arbor is formed into a shape corresponding to the non-circular shape of the roll body fitting portion of the arbor, and the roll body fitting portion of the arbor is formed. A wire forming roll characterized by shrink-fitting and fixing a roll body.