JPH0586302B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for twisting a long belt-like product, and particularly to a long belt-like product suitable for imparting twist to a long belt-like product at low cost. This relates to a twisting method.

[Conventional technology]

Conventionally, twisting of a long belt-like article has been carried out by clamping both ends of a portion of the long belt-like article to be twisted, and applying twisting torque to the clamps. However, with this processing method, not only deformation was concentrated in the clamp portion, but also the spring back was large. Therefore, in order to impart a predetermined twist, it has been necessary to perform repeated machining or to determine the value of the spring back through preliminary experiments before machining. However, according to the former method, the machining time becomes long, and according to the latter method, the spring back changes depending on variations in material properties and shape, resulting in poor machining accuracy. Further, in the case of a long belt-like article whose cross section changes in the longitudinal direction, uniform twisting cannot be obtained unless the interval between the clamps is shortened and twisting is performed. Regardless of which method is used, the method of applying twisting torque to perform the twisting process requires specialized equipment and lacks versatility.

In addition to the above method, when the workpiece is small, a method of twisting the workpiece by press using a mold is used, but this method requires an expensive mold. When using a full mold, the processing force increases as the workpiece becomes larger, requiring a large-sized press, and it is not possible to impart large torsions.

In addition, as shown in Japanese Unexamined Patent Publication No. 57-87913, there is also a method in which torsion torque is applied while locally heating the torsion applying part by high-frequency induction heating, and the heating position is sequentially moved to twist the entire part. However, it requires expensive equipment such as a high-frequency power source, and it is difficult to set processing conditions such as the moving speed of the heating body, the cooling method, and the timing of applying torsional torque.

[Problem that the invention seeks to solve]

As mentioned above, the conventional twisting method has a problem in that it is not possible to twist a long strip at low cost.

The present invention improves the problems of the prior art as described above, and provides a method for twisting a long strip-like product, which can give twist to a long strip-like product at low cost by using an existing press. Its purpose is to provide.

[Means for solving problems]

The structure of the method for twisting a long strip according to the present invention is such that the long strip is inserted between an upper tool and a lower tool that are arranged to face each other in the vertical direction. In a method for twisting a long strip in which the long strip is twisted by applying pressure from above and below with both tools, the upper tool is used so that the widthwise restraint section is wider than the plate width of the long strip. an upper restraining tool having a restraining surface that is also long; and an upper restraining tool having a pressing part in the width direction that is longer than the plate width of the long strip product and having a pressing surface that is inclined at a predetermined inclination angle with respect to the width direction of the restraining surface. an upper tool formed by overlapping a punch; A lower tool is formed by overlapping a lower punch whose directional pressing portion is longer than the plate width of the long strip-shaped product and has a pressing surface parallel to the pressing surface, and the upper tool and the lower tool are stacked together. The total length of the plate width of the long strip inserted between
After being restrained by the upper and lower restraining tools, the upper and lower punches are used to apply pressure to an appropriate length in the longitudinal direction and compression amount in the thickness direction, and partially shear the material. , by repeatedly feeding the long strip from one side to the other along its longitudinal direction and partially shearing it again, the long strip is twisted in the direction of the inclination angle. It is designed to give

[Effect]

After gripping the entire width of the long strip by a pair of upper and lower restraint tools having restraint surfaces longer than the width of the long strip, the upper and lower restraint tools hold the long strip. A pair of upper and lower punches having pressurizing surfaces inclined at a predetermined angle in the width direction of the long strip with respect to the restraining surfaces of the upper and lower restraining tools superimposed on the side surfaces in the feeding direction of the Then, by sequentially applying pressure along the longitudinal direction of the long strip-like product over a predetermined total pressurizing length with an appropriate pressure length in the longitudinal direction and an appropriate compression amount in the thickness direction, the long strip-like product is A predetermined uniform twist is imparted to the

〔Example〕

Hereinafter, the present invention will be explained with reference to Examples.

FIG. 1 shows the upper and lower tools used to carry out the twisting method for a long strip according to an embodiment of the present invention, and the long strip to be processed by the tools. , FIG. 1a is a front view, FIG. 1b is a side view, FIG. 2 is a perspective view showing details of the long strip in FIG. 1, and FIG. 3 is a front view, FIG. It shows the state in which the long strip-shaped article is restrained, and Fig. 3a is a front view, Fig. 3b is a side view, and Fig. 4 is a side view.
The figure shows a long strip product restrained by upper and lower restraint tools.
Figure 4a shows the front view, Figure 4b shows the side view, and Figure 5 shows the long strip after being pressed for the first time. The main part perspective view shown in FIG. 6 shows a state in which only one pitch of the long belt-shaped product is fed, and FIG. 6a is a front view,
Fig. 6b is a side view, Fig. 7 is a perspective view of the main part showing the long strip after the second pressurization, and Fig. 8 is a twist given to the long strip after processing is completed. FIG. 9 is a perspective view showing the twisted product that has been twisted, and is a view taken along the arrow in FIG.

An overview of this embodiment will be explained using drawings.
It is as follows.

A long strip-like product 1 is inserted between an upper tool and a lower tool that are arranged to face each other in the vertical direction, and the long strip-like product 1 is pressurized from above and below by both of the tools. A method for twisting a long strip product 2 by applying twist to a long strip product 1.
a Restriction surface 3a where _P is longer than the plate width w of the long strip 1
an upper restraining tool 3 having a width direction pressing part length _aK longer than the plate width w of the long strip-shaped product 1 and a pressing surface 5a that is inclined at a predetermined inclination angle θ with respect to the width direction of the restraining surface 3a. An upper tool 7 is formed by overlapping an upper punch 5 having A lower restraining tool 4 having a surface 4a and a lower punch 6 having a pressing surface 6a whose width direction pressing portion length aK' is longer than the plate width w of the long strip 1 and parallel to the pressing surface 5a are stacked. The lower tool 8 is formed by combining the upper tool 7 and the lower tool 8.
The entire length of the strip width w of the long strip 1 inserted between the After partially shearing by applying pressure to the compression length and the amount of compression in the plate thickness direction, the long strip 1 is sent along its longitudinal direction from the restraint tool side to the punch side and partially sheared again. By repeating the processing, a twisted product 2 in which the long strip-shaped product 1 is twisted by a twist angle α in the direction of the inclination angle θ is manufactured.

This will be explained in detail below.

As shown in detail in FIG. 2, the long strip-shaped product 1 is a plate material having a total length l, a plate width w, and a plate thickness t. A twist of a twist angle α is applied to the applied length l′). 1b is a handling device (not shown)
The clamp-side member 1c is held by the feed-side member.

An upper tool 7 and a lower tool 8 used to impart a twist to the twist imparting portion 1a of the long strip-shaped article 1 are as follows:
This will be explained using FIG. The upper tool 7 has a widthwise restraint section longer than the plate width w of the long strip-shaped product 1.
a _P , an upper restraining tool 3 having a restraining surface 3a with a longitudinal restraining length b _P , and a _K (= a _P ), the longitudinal direction pressurized portion is the constraint surface 3
With b _K (=b _P ) equal to the longitudinal pressurized section of a,
In addition, an upper punch 5 having a pressurizing surface 5a inclined at an inclination angle θ with respect to the width direction of the restraining surface 3a is stacked on top of the upper punch 5. ) is installed. The lower tool 8 has a widthwise restraint length aP′ (= _aP ) equal to the widthwise restraint length of the restraint surface 3a of the upper restraint tool 3, and a longitudinal restraint length equal to the restraint surface 3.
bP′ (=b _P ), which is equal to the longitudinal restraint length of a,
In addition, the lower restraining tool 4 has a restraining surface 4a parallel to the restraining surface 3a, and aK' whose widthwise pressing section is equal to the widthwise pressing section of the pressing surface 5a of the upper punch 5.
(=a _K = a _P ), the longitudinal direction pressurizing part is the pressurizing surface 5a
bK´ (=b _K = b _P ), which is equal to the longitudinal pressurized section of
and the lower punch 6 having a pressing surface 6a parallel to the pressing surface 5a is connected to the upper restraining tool 3 and the lower restraining tool 4.
are opposed in the vertical direction, and the upper punch 5 and lower punch 6
are arranged and stacked so as to face each other in the vertical direction. The lower tool 8 is attached to the lower ram (not shown) of the double-acting press, and the upper restraint tool 3 and the lower restraint tool 4 can be moved toward or away from each other at the same time with the same stroke. Furthermore, the upper punch 5 and the lower punch 6 can simultaneously approach or separate from each other with the same stroke, independently of the movements of the upper and lower restraining tools 3 and 4.

Using the upper and lower tools 7 and 8 configured as described above, a method of twisting a long strip-shaped article according to an embodiment of the present invention will be described.

First, the clamp-side member 1b of the long strip-shaped product 1 is clamped, and the clamp-side member 1b is moved by a handling device (not shown) that can transport the long strip-shaped product 1 in the longitudinal direction at a set pitch. grasp. Insert the feed side member 1c of the long strip-shaped article 1 into between the upper and lower tools 7 and 8 in the open state from the restraining tool side, and insert the feed side member 1c of the elongate strip-shaped product 1 into the space between the upper and lower tools 7 and 8 in the open state. The boundary surfaces (indicated by broken lines) are aligned with the tool mating surfaces 7a and 8a (FIG. 1).

When the double acting press is turned on, the upper and lower restraint tools 3 and 4 are driven, and both restraint tools 3 and 4 are driven.
approach each other, and clamp and restrain the torsion imparting portion 1a from above and below (FIG. 3). In this state,
The upper and lower punches 5, 6 are driven, and both punches 5,
6 approach each other, and pressurizes (pressurizes to plate thickness t') the part of the feed side member 1c adjacent to the boundary surface (the part where the longitudinal pressing length is b _K ) to shear the part. After machining (Fig. 4), upper and lower tools 7 and 8
becomes open and the first pressurization is completed.

As shown in FIG. 5, the long strip-like product 1 after this first pressurization is such that the feed side member 1c is twisted at the twisting portion 1a.
Pressure surfaces 5a and 6a of upper and lower punches 5 and 6
is twisted by an angle equal to the inclination angle θ, and the pressurized portion of the feed side member 1c is compressed by an amount of compression equal to (t-t') in the plate thickness direction.
Further, the gap, ie, the step difference δ, between the twist imparting member 1a and the feed side member 1c, which occurs on the right side when viewed from the handling device side, is approximately given by the following equation.

δ=(w/2)×sinθ−(t−t′)/2 Next, the long strip 1 is moved in the feeding direction 9 (the feeding direction from the restraining tool side to the punch side) by the handling device. It is fed by the set pitch (=length of the longitudinal pressing portion of the upper and lower punches 5 and 6) (Fig. 6). Here, in the same manner as the first pressurization,
The upper and lower restraining tools 3 and 4 are driven to twist the torsion imparting part 1.
a is restrained from above and below, and the upper and lower punches 5 and 6 are driven to pressurize a portion of the torsion imparting portion 1a (longitudinal pressing length = portion b _K ) adjacent to the pressurized portion. After shearing the portion, the upper and lower tools 7 and 8 are opened to complete the second pressurization. The long strip-shaped product 1 after this second pressurization is
It is shown in FIG.

Thereafter, the pressurization is repeated in the same way, and the torsion imparting portion 1a
When the pressurization of the total twisting length l' is completed, the eighth,
A twisted product 2 having a desired twist angle α as shown in FIG. 9 is obtained, and the double-acting press is turned off.

A specific example will be shown.

Total length l = 2000mm, plate width w = 200mm, plate thickness t = 20
Twisted portion 1 of aluminum long strip 1 of mm
When applying a twist with a twist angle α = 50° to a (twisting length l' = 1000 mm).

Length of the restraint part in the width direction of the restraint surface 3a of the upper restraint tool 3
a _P = 300 mm, length of the restrained part in the longitudinal direction b _P = 20 mm, length of the pressed part in the width direction of the pressing surface 5a of the upper punch 5 a _K = 300
mm, longitudinal pressure section length b _K = 20 mm, inclination angle θ = 1°
Width direction restraint part length aP' of restraint surface 4a of upper tool 7 and lower restraint tool 4 = 300 mm, longitudinal direction restraint part length
bP' = 20 mm, length of the pressing part in the width direction of the pressing surface 6a of the lower punch 6 aK' = 300 mm, length of the pressing part in the longitudinal direction bK' =
A lower tool 8 of 20 mm and an inclination angle θ = 1° was used.
Adjust the pitch of the handling device using upper and lower punches 5,
It was set to 20 mm, which is equal to the length of the pressurized section in the longitudinal direction of 6. In other words, the length of one pressurization in the longitudinal direction is
The length is 20 mm, which is equal to the longitudinal pressing length of the upper and lower punches 5 and 6. The magnitude of the restraint force on the long strip 1 by the upper and lower restraint tools 3 and 4 is an average surface pressure of 5 kgf/mm ² to the extent that plastic deformation does not occur due to the restraint tools.
The amount of compression in the plate thickness direction is 1 mm (=t-t'=20
mm - 19 mm).

When the long strip-shaped product 1 was processed in this manner, the twist angle produced by one pressurization was 1°, which was equal to the inclination angle θ of the punches 5 and 6. By repeating this pressurization 50 times,
α=
Twisted product 2 having a twist angle of 1°×50=50° could be obtained. Note that when the step difference δ is calculated using the above-mentioned calculation formula, it is δ=1.25 mm.

According to the embodiment described above, the existing press,
That is, by using the double acting press,
Twisting can be easily imparted to the long strip-shaped article 1 at low cost. Also, upper and lower punches 5 and 6
By repeating and accumulating local shearing processes, the entire torsion imparting part 1a is machined. Therefore, deformation concentrates on each sheared part, hardly causing spring back, and increasing height. This has the effect of allowing precision machining to be performed.

In this embodiment, only the clamp-side member 1b of the long strip-shaped product 1 is gripped by the handling device, but the feed-side member 1 is also gripped by the handling device.
If c is gripped by an auxiliary handling device that is rotatable and can reciprocate with respect to feeding in the longitudinal direction, the center axis of torsion can be secured, and the bending of the long strip-shaped product 1 during processing can be prevented. Since this can be prevented, there is an advantage that machining accuracy is further improved.

Furthermore, in this example, the long strip-shaped product 1
is sent from the restraint tool side to the punch side, but it may be sent in the opposite direction from the punch side to the restraint tool side. In this case, it is necessary to rotate the handling device by the inclination angle θ of the upper and lower punches 5 and 6 in the opposite direction to the twisting direction each time one pressurization is completed.

Furthermore, in this embodiment, the thickness of the long strip 1 is adjusted to t'=19 mm by the upper and lower punches 5 and 6.
Although the amount of compression (t-t') may be zero. However, when the amount of compression is applied, the portions pressed by the upper and lower punches 5 and 6 become more flat. In addition, if the edges of the restraint surfaces of the upper and lower restraint tools 3 and 4 and the pressurizing surfaces of the upper and lower punches 5 and 6 are rounded, adjacent pressing parts can be connected by a smooth surface shape. do.

In addition, in this embodiment, the upper and lower tools 7,
8 is attached to a double-acting press, but instead of the double-acting press, it is attached to a single-acting press, and the above-mentioned upper and lower restraining tools 3, 4 and the upper, The same operation as that of the lower punches 5 and 6 may be performed.

Finally, in this embodiment, a case has been described in which a uniform twist is imparted to a long strip product 1 of uniform cross section. However, using the upper and lower tools 7 and 8, It is also possible to perform the twisting process on a long strip tapered in the thickness direction. Further, if it is desired to change the twist angle to θ' during processing, the punches with the inclination angle θ' can be replaced with upper and lower punches and the processing is performed.

Next, another embodiment will be described.

In the embodiment, the upper and lower restraint tools 3, 4
The long strip-shaped product 1 was processed by alternately driving the upper and lower punches 5 and 6.
The torsion angle (=tilt angle θ) per pressurization is small,
In addition, when performing machining with a small compression amount (t-t'), for example, when machining θ = 1°, t-t' = 1 mm, the restraining surface and the pressurizing surface are can be processed using an upper tool in which the upper restraint tool and the upper punch are integrated, and a lower tool in which the lower restraint tool and the lower punch are integrated, in which the upper restraint tool and the lower punch intersect at approximately the center of the width.

The reason for this is that when the twist angle per twist is small and the amount of compression is small, the thickness center line of both interfaces at the boundary between the restraining tool side and the punch side of the sheared part of the long strip , when viewed from the direction perpendicular to the width, intersect approximately at the center of the width of the elongated strip.

As described above, in this embodiment, since the upper and lower tools are each integrated, there is an advantage that the structure is simple and the driving operation is easy.

〔Effect of the invention〕

As explained in detail above, according to the present invention, by using an existing press, it is possible to
It is possible to provide a method for twisting a long strip-shaped article, which can impart twist to the long strip-shaped article.

[Brief explanation of the drawing]

FIG. 1 shows the upper and lower tools used to carry out the twisting method for a long strip according to an embodiment of the present invention, and the long strip to be processed by the tools. , FIG. 1a is a front view, FIG. 1b is a side view, FIG. 2 is a perspective view showing details of the long strip in FIG. 1, and FIG. 3 is a front view, FIG. It shows the state in which the long strip-shaped article is restrained, and Fig. 3a is a front view, Fig. 3b is a side view, and Fig. 4 is a side view.
The figure shows a long strip product restrained by upper and lower restraint tools.
Figure 4a shows the front view, Figure 4b shows the side view, and Figure 5 shows the long strip after being pressed for the first time. The main part perspective view shown in FIG. 6 shows a state in which only one pitch of the long belt-shaped product is fed, and FIG. 6a is a front view,
Fig. 6b is a side view, Fig. 7 is a perspective view of the main part showing the long strip after the second pressurization, and Fig. 8 is a twist given to the long strip after processing is completed. FIG. 9 is a perspective view showing the twisted product that has been twisted, and is a view taken along the arrow in FIG. 1...Long strip product, 2...Twisted product, 3...Upper restraint tool, 3a...Restriction surface, 4...Lower restraint tool, 4
a...Restriction surface, 5...Upper punch, 5a...Pressure surface, 6...Lower punch, 6a...Pressure surface, 7...Upper tool, 8...Lower tool, 9...Feed direction, a _K ...
...Length of the pressure section in the width direction of the upper punch, aK´...Length of the pressure section in the width direction of the lower punch, _aP ...Length of the constraint section in the width direction of the upper restraint tool, aP´...Restraint in the width direction of the lower restraint tool Length of part, b _K ... Length of the longitudinal direction of the upper punch,
bK´... Length of the longitudinal direction of the lower punch, b _P ...
Length of the longitudinal restraint part of the upper restraint tool, bP´...Length of the longitudinal restraint part of the lower restraint tool, w...Plate width of the long strip product, α...Twist angle, θ...Inclination angle.

Claims (1)

[Scope of Claims] 1. A long strip-like product is inserted between an upper tool and a lower tool that are arranged to face each other in the vertical direction, and the long strip-like product is processed from above and below by both tools. In a method for twisting a long strip by applying pressure to the long strip, the upper tool is an upper restraining tool having a restraining surface whose width direction restraining portion is longer than the plate width of the long strip. and an upper punch having a widthwise pressing portion longer than the plate width of the long strip-shaped product and having a pressing surface inclined at a predetermined angle with respect to the width direction of the restraining surface. and the lower tool is a lower restraint tool having a restraining surface whose widthwise restraining part is longer than the plate width of the elongated strip and parallel to the restraining surface, and a lower tool whose widthwise pressing part is the long strip. The long strip-shaped product is inserted between the upper tool and the lower tool, the lower tool being formed by overlapping a lower punch with a pressure surface that is longer than the plate width of the strip-shaped product and parallel to the pressure surface. The total length of the plate width is
After being restrained by the upper and lower restraining tools, the upper and lower punches are used to apply pressure to an appropriate length in the longitudinal direction and compression amount in the thickness direction, and partially shear the material. , by repeatedly feeding the long strip from one side to the other along its longitudinal direction and partially shearing it again, the long strip is twisted in the direction of the inclination angle. A method for twisting a long belt-like product, characterized by imparting the following properties. 2. The long strip according to claim 1, wherein the long strip is repeatedly fed along its longitudinal direction from the restraining tool side to the punch side and partially sheared again. How to twist products. 3. The upper and lower sides of the restraining tool and the punch are integral, where the inclination angle of the pressing surface with respect to the width direction of the restraining surface is small, and the restraining surface and the pressing surface intersect approximately at the center of the width when viewed from the direction perpendicular to the width. The long strip product according to claim 1, which is partially sheared by applying pressure with a small or zero compression amount in the thickness direction using a tool. Twisting method.