JP2010162578A - Grooved bar having deformed cross section and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a bar having a deformed cross section, which is easily punched into desired dimensions. <P>SOLUTION: A bar having a deformed cross section has a thick-walled portion and a thin-walled portion, which are formed in the width direction of the bar. On either or both of the front surface and the rear surface of the bar, grooves extending in the width direction of the bar are formed with predetermined intervals in the longitudinal direction of the bar. After manufacturing, by rolling, the bar having a deformed cross section, grooves are formed on the bar, by conducting rolling with rolls, on the surfaces of which a plurality of projections are formed, or by conducting pressing with a die, on the surface of which projections are formed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a modified cross-section for manufacturing various parts by punching to a desired dimension and a manufacturing method thereof.

  Conventionally, lead frames for electronic parts and retainers for bearings are manufactured using a modified cross-section strip 3 in which a thick portion 1 and a thin portion 2 are formed in the plate width direction as shown in FIG. . Parts such as a lead frame and a retainer are manufactured from the irregular cross-section strip 3 by cutting the irregular cross-section strip 3 in accordance with the shape and dimensions of a desired part or by punching with a press (for example, Patent Document 1). reference). In order to facilitate such processing, the deformed section strip 3 is mainly a relatively thin section strip having a thickness of about 1 mm.

However, in recent years, there has been an increasing demand for cost reduction of parts by omitting processes at the time of parts processing, and various parts that have been manufactured by other methods have been manufactured from irregular cross-sections.
For example, a pedestal 6 ′ for fixing a pipe-shaped or bar-shaped member 4 as shown in FIG. 2 to a base part 5 with a bolt 7 is manufactured from a modified cross-section strip 6. The deformed cross-section strip 6 for manufacturing the pedestal 6 'is made of special steel having a high hardness with a carbon content of 0.2% or more in order to suppress deformation and wear during bolt tightening. Is a thick plate with a thickness of 5 mm or more.

Japanese Patent Laid-Open No. 9-47818

  In order to manufacture the pedestal 6 'shown in FIG. 2 from the modified cross-section strip 6, as shown in FIG. 3, the step of punching the modified cross-section strip 6 into a specified dimension by press working and the hole 8 for inserting the bolt by press working. A punching process is required. However, the step of punching the irregular cross-section strip 6 into a specified dimension by press working is particularly difficult because the material constituting the irregular cross-section strip 6 has high hardness and it is necessary to punch out the thick wall portion. There was a problem that the wear and chipping of the mold increased and the mold cost increased.

  Further, in order to punch out the irregular section strip 6 to a prescribed dimension corresponding to the dimension of the pedestal 6 ', it is necessary to stop the irregular section strip 6 so as to have a prescribed dimension in the mold. As shown in FIG. 4, a method is generally employed in which a stopper 12 is installed downstream of a die 10 provided with a punch 9 and an ejector 11 which are punching dies to stop the deformed cross section 6. However, with this method, when the punching dimensions are changed, it is necessary to change the position of the stopper 12 in addition to the punching punch 9, the ejector 11, and the die 10. .

  Further, regardless of the rolling method, the extrusion method, or the drawing method, the manufactured irregular cross-section strip 6 is once wound into a coil shape and then conveyed to the component manufacturing process. In the component manufacturing process, it is necessary to correct the deformed cross-section strip 6 before the punching process in order to remove the winding wrinkles of the deformed section strip 6 when the deformed section strip 6 wound in the coil shape is discharged to the punching process. is there. However, when the thickness of the deformed cross-section strip 6 is large, the amount of correction must be increased, and the rigidity of the correction device must be increased.

The present invention has been devised to solve such problems, and provides a low-cost component manufactured by punching into a predetermined dimension using a deformed cross-section wound in a coil shape. The object is to provide an irregular cross section that can be made.
Furthermore, it aims at providing the method of manufacturing such an irregular cross-section at low cost.

In order to achieve the object, the grooved deformed section strip of the present invention has a longitudinal direction of the deformed section strip on either the front surface or the back surface of the deformed section strip in which a thick portion and a thin portion are formed in the width direction. On the other hand, grooves extending in the width direction at predetermined intervals are formed. Grooves extending in the width direction at predetermined intervals with respect to the longitudinal direction of the deformed section strip are formed at the same positions on both the front and back surfaces of the deformed section strip in which the thick section and the thin section are formed in the width direction. May be.
The method for producing a grooved deformed section strip according to the present invention includes forming a deformed section strip having a thick portion and a thin portion in the width direction, and then using the roll having a plurality of protrusions on the surface. By rolling, a groove extending in the width direction is formed at a predetermined interval with respect to the longitudinal direction of the deformed section strip. After forming a deformed cross-section having a thick part and a thin part in the width direction, the deformed cross-section is pressed by a mold having a protrusion, thereby giving a predetermined length in the longitudinal direction of the deformed cross-section. Grooves extending in the width direction at intervals may be formed.

The profiled strip with groove according to the present invention has a groove formed in advance at a position where punching is performed in order to cut into a predetermined dimension, and is in a state where a notch exists. It can be punched with a relatively low load compared to the case where there is no. For this reason, the burden on the punching die is reduced, and the life of the die is increased.
Moreover, since the groove | channel of the irregular cross-section strip with a groove | channel of this invention is formed in the predetermined space | interval, it becomes possible to determine a punching position by detecting the position of a groove | channel, and a stopper becomes unnecessary.

Furthermore, since the profiled strip with groove of the present invention has a thin plate thickness at the portion where the groove is formed, the deformation concentrates on the groove portion when the coil is wound, and the other portion is significantly curved. Since it is wound up in a coil shape, the groove part deformed when it is paid out only returns to its original shape, and the flat part other than the groove part has almost no so-called curl so that it is relatively mild correction. There is an advantage that it can be inserted into a punching die depending on the amount.
When manufacturing the grooved deformed section strip of the present invention by a rolling method, the groove can be formed on the deformed section strip by a rolling method or a press working method after the rolling process. Implementation is possible, and grooves can be formed without reducing production efficiency.

A diagram showing a modified cross section of a conventional thin plate The figure which shows an example of the use condition of the irregular section strip of the thick plate Schematic diagram showing the processing status from thick-walled irregular cross-section strips to parts Overview of conventional punching of irregular cross-section strips Overview of groove detection with sensors The figure which shows the method of forming the groove | channel for punching of this invention by rolling The figure which shows the method of forming the groove | channel for punching of this invention by press work The figure which shows the cross-sectional shape of the irregular shaped cross section with a groove | channel of an Example.

The inventors of the present invention use a deformed cross section having a high hardness and a large thickness as a raw material, and apply a punching method to the deformed cross section to manufacture a desired punched part while appropriately cutting the deformed cross section into a length. At the same time, various methods have been studied for reducing the burden on the punching die.
The load applied to the punching die increases when the deformed cross section has a high hardness, is thick and has a large punching area, and wear of the punching die increases to shorten the service life. In order to reduce the load borne by the punching die, it is necessary to reduce the strength of the portion to be punched out of the irregular cross-section. One possible method is to reduce the hardness of the material. However, since the hardness affects the performance of the part, it is necessary to heat it after processing it into a part shape to obtain a predetermined hardness. Efficiency will decrease.
As another method, there is a method of reducing the thickness of the material of the punched portion, and the present inventors have found the action and completed the present invention.

The effect of reducing the load borne by the punching die due to the reduction in the plate thickness is due to the fact that the strength of the portion itself is lowered by reducing the cross-sectional area of the punched portion. As a method for reducing the thickness of the punched portion, a groove may be formed at a location where the irregular cross-section strip is to be punched according to the part dimensions. That is, it is only necessary to form grooves extending in the plate width direction at a predetermined interval corresponding to the component dimensions with respect to the longitudinal direction of the deformed cross section.
From the viewpoint of reducing the punching load, it is preferable to provide a groove in the entire plate width along the irregular cross section. However, when the irregular cross section has a complicated shape, it is necessary to match the mold for forming the groove with the irregular cross section, which causes a problem that it becomes difficult to manufacture the mold. Depending on the type of the irregular cross-sectional shape, a separate mold is required, and the versatility of the mold is reduced. Therefore, when the groove is formed in the plate width direction of the irregular cross-section strip in which the thick portion and the thin portion are formed in the width direction, a groove having a shape that is deep in the thick portion and shallow in the thin portion is provided. In an extreme case, as shown in FIG. 6, the groove may be formed only in the thick part.

A deformed cross-section having a thick portion and a thin portion formed in the width direction is generally provided with irregularities due to the thick portion and the thin portion on one surface and a flat surface on the opposite side. If the uneven surface is the front surface of the irregular cross-section strip and the flat surface is the back surface, the groove may be formed on either the front surface or the back surface of the irregular cross-section strip, Also good. When forming on both surfaces, the groove should be formed at the same position. When a groove is formed on the surface of the irregular cross-section strip, the groove can be formed only on the thick portion, or the groove can be formed over the entire plate width direction of the irregular cross-section strip.
The shape of the groove is not particularly limited, and a V-shaped or U-shaped groove can be formed.

Usually, after manufacturing an irregular cross-section strip, it is wound into a coil shape, and the coil-shaped irregular cross-section strip is delivered to a punching process. If the deformed section strip wound in a coil shape is paid out to the punching process, it becomes difficult to insert the deformed section strip into the punching die by the winding rod, so it is necessary to correct the deformed section strip. In some cases, it is difficult to deform, so the amount of correction needs to be increased. However, in the case of the grooved profiled section shall, only that portion to the thickness of the portion forming the groove is thin easily deformed, because only the deformed portion is deformed restored upon dispensing, the relatively amount of correction It can be inserted into a punching die with a small amount.

  The depth of the groove formed in the deformed section strip is not only the effect of reducing the load imposed on the punching die by reducing the plate thickness as described above, but also winding or punching the deformed section strip formed with the groove into a coil shape. It must also be determined in consideration that the discharge to the process can be performed satisfactorily and that the metal properties of the part are not deteriorated by the stress applied to the vicinity of the bottom of the groove during winding or discharge. Although depending on the material constituting the deformed section strip and the shape of the deformed section strip, the total groove depth applied to one or both sides is about 5 to 30% of the thickness of the thick section of the deformed section strip. Is preferred.

If the groove depth is less than 5%, the area to be cut increases, and it is difficult to reduce the cutting load, which is an effect of the present invention. If the groove depth is shallow, the material winding load increases, and it becomes difficult to correct the shape after the material is dispensed in the cutting process.
On the other hand, when the groove depth becomes deeper than about 30%, the load on the mold for attaching the groove becomes excessive, and it becomes difficult to obtain the target groove depth. Further, when the groove depth becomes deep, there is a possibility that a stress concentration in the groove portion becomes remarkable and the material breaks during winding or correction after the material is discharged in the cutting process.
Usually, in rolling a single-sided irregular cross-section material, it is preferable to pass the plate with the deformed surface on the upper side so that the deformed surface can be directly visually observed from the viewpoint of plate workability and manageability.
When grooves are provided on both sides, as described above, it is difficult to position the upper and lower rolls with a roll, and thus the method is limited to a groove applying method using a press.

  The detection of the groove formed in the deformed cross-section strip uses, for example, a non-contact optical distance meter as the sensor 13 as shown in FIG. 5 to detect a change in distance from the sensor 13 to the groove-shaped cross section strip surface 14. Can be done. That is, since the distance in the groove 15 becomes longer, the position of the groove 15 can be detected. By using a constant distance between the sensor 13 and the punch 9 for punching and using this detection signal, it is possible to calculate the length for feeding the grooved deformed section 14 into the punching die. By controlling in conjunction with each other, it becomes possible to punch out the grooved deformed cross section 14 at an accurate position. The sensor 13 is not limited to a non-contact type and may be a contact type. In the case of the contact type, the contact 15 fluctuates up and down in the groove 15, so that the groove 15 can be detected by sensing its operation.

Next, a method for manufacturing the grooved deformed section strip 14 will be described. First, in order to obtain an irregular cross-section 6 having a predetermined irregular cross-sectional shape, rolling is performed using a roll having irregularities corresponding to the shape, and then a punching groove 15 is formed. In addition, this invention does not limit the rolling method as a shaping | molding method of an irregular cross-section strip. The deformed cross section may be formed using an extrusion method or a drawing method.
As shown in FIG. 6, the groove 15 is formed by using a roll 16 having a plurality of protrusions on the surface at a predetermined interval that matches the size of the part, that is, a pitch that matches the interval of the punching portion. This is done by rolling Article 6. In this method, since it becomes possible to provide a rolling device for forming the groove 15 on the extension of the line for producing the deformed cross-section strip 6 by rolling, the production efficiency does not decrease due to the formation of the groove 15. Also, the production cost is not increased.
In FIG. 6, the method of forming the groove 15 on the surface of the irregular cross-section strip 14 is shown, but the groove 15 may be formed on the back surface.

As another method, as shown in FIG. 7, the groove 15 can be formed by pressing the deformed cross-section strip 6 using a mold 17 having a projection on the surface. Also in this method, after manufacturing the irregular cross-section strip 6 by rolling, it is possible to form the groove 15 by the mold 17 having the protrusion on the surface on the same line. Also in this case, the production efficiency is lowered and the production cost is reduced. There will be no increase.
FIG. 7 shows a method of forming the grooves 15 on the surface of the modified cross-section strip 14. However, the grooves 15 may be formed on the back surface, or the mold 17 having protrusions on the surface may be formed on the deformed section strip 6. You may make it form the groove | channel 15 in both front and back of the irregular cross-section strip 14 by arrange | positioning up and down and pressing it synchronously.

Using an S20C having a plate width of 20 mm, a plate thickness of 6 mm, and a cross-sectional hardness of HV130 as a material, an uneven roll having a convex portion having the same dimensions as the thin wall portion shown in FIG. As a result, a deformed cross-section 6 having a cross-sectional shape shown in FIG. 8 was produced by rolling. This deformed section 6 has an overall width W1 of 22 mm, a width W2 of the thin portion of 8 mm, a taper angle α from the thick portion to the thin portion of 45 °, a thickness t of the thin portion of 3 mm, and a plate of the thick portion The thickness T is 5.5 mm.
Grooves 15 were formed in the deformed section strip 6 by a method of rolling using a roll having a plurality of protrusions on the surface shown in FIG. On the surface of the roll for forming the groove, V-shaped projections having a tip angle of 10 ° and a height of 2 mm are installed at intervals of 20 mm in the circumferential direction of the roll, and the tip of the deformed section strip 6 is spaced at intervals of 20 mm. A groove 15 having an angle of 10 ° and a depth of 1 mm was formed, and a deformed cross section 14 with a groove was formed.

The grooved deformed cross-section strip 14 having the groove 15 was wound into a coil shape, taken out from the coil, and subjected to punching. The grooved deformed cross-section 14 manufactured in this way and the deformed cross-section 6 without only the formation of the groove 15 are punched into a length of 20 mm, the load during processing, and the correction amount of the material after being discharged from the coil Compared.
For correction, a roller having a diameter of 100 mm and three roller levelers on the upper side and four on the lower side were used, and the maximum pressing amount of the roll was compared as the correction amount.
As a result of punching, the deformed cross-section 14 with the groove was able to reduce the load at the time of punching by 20% compared to the deformed cross-section 6 without the groove 15. Further, the correction amount of 2 mm was necessary for the modified cross-section strip 6 without the groove 15, but the correction amount of 0.5 mm was sufficient for the modified cross-section strip with groove 14, which can be greatly reduced. did it.

  Further, in the punching of the grooved deformed section strip 14, as shown in FIG. 5, a non-contact optical sensor 13 is installed upstream of the punching die, and the grooved deformed shape is formed so that the groove 15 is at the punching position. The feeding of the cross-section strip 14 was controlled. When the punching position was confirmed, it was possible to stably punch the groove 15 from the start end to the end of the coil.

1 ... thick part, 2 ... thin part, 3 ... shaped cross section of thin plate,
4 ... Pipe-like or bar-like parts, 5 ... Base parts, 6 ... Thick plate deformed section strips, 7 ... Bolts, 8 ... Holes, 9 ... Punches, 10 ···dice,
DESCRIPTION OF SYMBOLS 11 ... Ejector, 12 ... Stopper, 13 ... Sensor 14 ... Deformed cross section with groove, 15 ... Groove, 16 ... Roll provided with a plurality of protrusions,
17 ... Mold having protrusions on the surface,
W1 ... Wide width, W2 ... Thin portion width, t ... Thin portion thickness,
T: Thickness of thick part, α: Taper angle

Claims (4)

  A groove extending in the width direction at a predetermined interval with respect to the longitudinal direction of the deformed section strip is formed on either the front surface or the back surface of the deformed section strip in which the thick section and the thin section are formed in the width direction. An irregular cross-section with grooves, characterized in that   Grooves extending in the width direction at predetermined intervals with respect to the longitudinal direction of the deformed section strip are formed at the same positions on both the front and back surfaces of the deformed section strip in which the thick section and the thin section are formed in the width direction. An irregular cross-section with grooves, characterized in that   After forming a deformed cross section having a thick part and a thin part in the width direction, by rolling the deformed cross section using a roll having a plurality of protrusions on the surface, in the longitudinal direction of the deformed cross section 3. The method for producing a grooved irregular cross-section according to claim 1 or 2, wherein a groove extending in the width direction at a predetermined interval is formed.   After forming a deformed cross-section having a thick part and a thin part in the width direction, the deformed cross-section is pressed by a mold having a protrusion, thereby giving a predetermined length in the longitudinal direction of the deformed cross-section. 3. The method for producing a grooved irregular cross-section according to claim 1 or 2, wherein grooves extending in the width direction at intervals are formed.

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