JPH07276147A - Manufacture of u-bolt having seat plate - Google Patents

Abstract

PURPOSE:To efficiently manufacture a U-bolt having a seat plate, and correctly mount the seat plate by press-fitting the seat plate to the position of a stepped part through a tapered part. CONSTITUTION:A rod is cut to the prescribed length, and both ends are cut to a slightly small diameter to the prescribed position of a seat plate 2, and a stepped part (a) is cut to have an angle of approximately 3 deg.. The off-centered seat plate 2 which is blanked by a blanking machine is fitted into the small diameter part so that the inner diameter of the seat plate may be smaller, and the seat plate is simultaneously press-fitted from the right and left by a press-fitting machine through a tapered part to the prescribed position of the stepped part (a). The stepped part (a) is cut to the angle of approximately 3 deg., and the corner part is raised by the press-fitting, and strongly reinforced against the screw tightening torque. In addition, the threading is executed on the small diameter part on both end sides of the rod 1 to the stepped part (a) by a thread rolling machine, and the rod 1 is bent in a U-shape from the center in a symmetrical manner in the right- to- left direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a U-shaped bolt with a seat plate used for piping or the like.

[0002]

2. Description of the Related Art Conventional U-shaped bolts are used in various ways, especially in connection with electric wires or pipes. In this case, when a seat plate is attached, welding is required when the seat plate is attached to the bolt shaft. Is common.

[0003]

When the above-mentioned seat plate is welded to the bolt shaft portion, there is a weak point in strength because the seat plate is deformed when it is tightened to the mounting plate or the like so that it cannot be accurately mounted. Further, various adverse effects such as dimensional error occurred during welding.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, the present invention addresses the above-mentioned problems by positioning a seat plate fitted on a rod into a set position by press-fitting a groove provided in a movable plate and positioning the left and right sides. The present invention provides a manufacturing method in which the movable plate is carried out by a press-fitting machine which is simultaneously press-fitted from the left and right by the pressing surface provided on the lifting plate, and the work is efficiently performed by bending.

[0005]

[Operation] While cutting one rod 1 into a predetermined length,
Both ends are cut to a slightly smaller diameter up to the set position of the seat plate 2, and the step a is cut so as to form an angle of about 3 °, and the knurls are formed around the small diameter side of the cut step a. b processing is performed, and further, the inner diameter of the eccentric seat plate 2 punched by the punching machine is reamed, and after this seat plate 2 is fitted in the small diameter portion, the press fitting machine B moves to the predetermined step a position left and right. Press in at the same time. At this time, the step portion a is cut at an angle of about 3 °, and the corner portion is bulged by press-fitting and is strongly reinforced against the screw tightening torque.

The rod 1 having the seat plate 2 press-fitted by the press-fitting machine B in this manner is relatively close to one another on the support 14 between the pair of screw engraving rollers 13, 13a by the thread rolling machine C. After the screw is formed, a seat plate 2 is additionally provided, and the rod 1 is mounted on the pad 17 by positioning the center part and the seat plate 2 in the same direction. On the other hand, the punch 16 is lowered while being held between the punch 16 and the pad 17, and is guided by a pair of roller guides 18 and 18a arranged in front of and behind the punch 16 to complete the bending work into a U shape, 16 is lifted and the U-bolt bent into a U-shape after that is extracted from the punch 16 and the molding is completed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a method for manufacturing a U-shaped bolt with a seat plate according to the present invention, which will be described below with reference to the drawings.

Reference numeral 1 is a rod body cut into a predetermined length, and the seat plate 2 has a slightly smaller diameter on the left and right ends of the rod body 1.
The cutting process is performed up to the set position, and the step a formed by the cutting process is cut at an angle of about 3 ° (see FIG. 1a).

Knurling is performed on the small-diameter portion side of the stepped portion a on which the shaving is performed. In this knurling process, a supporting piece 4 and a positioning receiving piece 4 are provided between a pair of knurled rollers 3 and 3a of the knurling rolling machine A, the rod 1 is positioned on the supporting piece 4, and the receiving piece 5 is placed. The roller 3a is positioned by contacting it, and the roller 3a is relatively rotated while approaching the other roller 3 to knurl the fixed position of the stepped portion a (see FIG. 1b).

Into the small diameter portion of the rod body 1 which has been subjected to this processing, the seat plate 2 which is formed by stamping a band-shaped plate material and which has been reamed and finished with holes is fitted, and the seat plate 2 is attached. Press into the knurled b at the step a position.

The press-fitting machine B includes a fixed plate 7 provided on the machine body 6, sliding plates 8 and 8 arranged on the left and right sides of the fixed plate 7, and movable plates slidably fitted to the sliding plates 8 and 8, respectively. 9, 9 and moving board 9, 9
The lifting plate 10 located at the upper part of the table is moved up and down.

The elevating plate 10 is attached to a ram of a press machine, and pressing slopes 10a, 10a for pressing the back parts of the moving plates 9, 9 are formed in a claw shape on the left and right sides of the lower surface.

Further, each of the movable plates 9 and 9 has, on the back side thereof, the same slopes 9a and 9a as the pressing slopes 10a and 10a provided on the elevating plate 10, and is further fitted to the rod 1 in the longitudinal direction. A guide rod 9c of a return spring 11 provided between the fixed platen 7 and the movable platen 9 is provided so as to project toward the fixed platen 7 in the grooves 9b, 9b into which the seat plate 2 is fitted and the front end side. Therefore, when the elevator board 10 is lowered, the rod body 1 in which the seat plate 2 is fitted to the movable boards 9 and 9 is returned and the movable board 9 is resisted against the spring 11.
And the seat plate 2 is press-fitted to the position of the step a of the rod 1 by this movement. The movable platen 9 that has moved to the press-fitting position is returned by the rise of the elevating plate 10 and returned to the original position by the spring 11.

The rod 1 having the press-fitted seat plate 2 is thread-rolled by the thread-rolling machine C in the next step. The thread rolling machine C is provided with a support body 14 for supporting the rod body 1 and a receiving piece 15 for setting a screw forming position between a pair of screw rollers 13, 13a in which thread grooves 12, 12 are engraved. The rod 15 is supported by the receiving piece 15, and the screw roller 1
3, the rod body 1 is sandwiched by 3 and 13a, and the screw roller 13 is relatively rotated while approaching the opposite screw roller 13a to perform screw molding.

Next, the bending machine D will be described. The rod body 1 that has been screwed is a punch 16 having a circular cross section attached to the press machine, a cushion pad 17 provided under the punch 16 and a pair of guide rollers 18 arranged in front of and behind the punch 16 and corresponding to a die. 18a, the rod 1 is mounted on the pad 17 and positioned, and then the punch 16 is lowered to hold the rod 1 between the pad 17 and the punch 16 and lower the punch 16 to roll the rollers 18, 18a. A rod body is bent in a U-shape along with, and the rod body 1 bent by the ascent of the punch 16 ascends and is pulled out from the punch 16 to form a U-bolt.

[0016]

As described above, according to the present invention, the seat plate serving as the stopper is press-fitted and fixed, and the manufacturing is simple, unlike the conventional welding, and is accurate and beautiful. Further, since the seat plate has a configuration in which a certain angle is provided on the step portion and press-fitting can be stopped by the receiving surface that is cut, it becomes strong against tightening torque,
Further, since the seat plate is press-fitted at one time when the lift plate is lifted, there is an effect that the seat plate is not biased or deformed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a process sequence of a method of manufacturing a U-shaped bolt with a seat plate according to the present invention.

FIG. 2 is a front view of a turret forming rolling machine.

FIG. 3 is a front view of a seat plate press-fitting machine.

FIG. 4 is a front view of a thread rolling machine.

FIG. 5 is a side view of the bending machine.

FIG. 6 is a front view of a U-shaped bolt.

FIG. 7 is a bottom view of FIG.

[Explanation of symbols]

 1 bar body 2 seat plate 3,3a roller 4 support piece 5 receiving piece 6 machine body 7 fixed plate 8 sliding plate 9 moving plate 9a slope 9b groove 9c guide rod 10 lift plate 10a pressing slope 11 return spring 12 screw groove 13, 13a Screw roller 14 Support 15 Receiving piece 16 Punch 17 Cushion pad 18, 18a Guide roller A Knurling machine B Pressing machine C Screw rolling machine D Bending machine a Step b Knurling

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[Procedure amendment]

[Submission date] June 19, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances to solve the above-mentioned problems, that is,
Both ends of one rod cut into a predetermined length are machined to a seat plate setting position with a slightly smaller diameter to provide step portions, and the step portions are ground at a slight angle. The small diameter side of the stepped portion is provided with a taper that is punched and has a notched inner diameter side to improve the biting of the seat plate.The seat plate is press-fitted to the stepped portion position via this taper. A U-shape with a seat plate, characterized in that the small diameter portion on both ends is threaded by a screw transfer machine up to the step, and the rod body is symmetrically bent from the center into a U shape. It provides a bolt manufacturing method.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

[Operation] While cutting one rod 1 into a predetermined length,
Both ends are cut to a slightly smaller diameter to the set position of the seat plate 2, and the step a is cut to form an angle of about 3 °, and a small diameter side of the cut step a is cut by a punching machine. By narrowing the inner diameter of the punched eccentric seat plate 2,
After fitting in the small-diameter portion, it is simultaneously press-fitted from the left and right by the press-fitting machine B to the predetermined step a position via the taper. At this time, the step portion a is cut at an angle of about 3 °, and the corner portion is bulged by press-fitting and is strongly reinforced against the screw tightening torque.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

The rod 1 having the seat plate 2 press-fitted by the press-fitting machine B in this manner is relatively close to one another on the support 14 between the pair of screw engraving rollers 13, 13a by the thread rolling machine C. After the screw is formed, a seat plate 2 is attached and the rod 1 is mounted on the pad 17 by eccentrically positioning the center position and the seat plate 2 in the same direction. On the other hand, while the punch 16 and the pad 17 hold the punch 16, the punch 16 descends and is guided by a pair of roller guides 18 and 18a arranged in front of and behind the punch 16 so as to be bent symmetrically in a U shape. Give, finish this processing,
The punch 16 rises and the U-bolt bent in a U shape after that is extracted from the punch 16 and the molding is completed.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

In the small-diameter portion of the rod body 1 that has been subjected to this processing, a strip-shaped plate material is formed by punching with an eccentric shape narrowed between the holes 2a, and the holes are reamed to finish the holes. Then, the seat plate 2 is fitted and the seat plate 2 is press-fitted to the position of the step portion a via the taper.

Claims (1)

[Claims] 1. A rod body is cut into a predetermined length, and a step portion is provided by cutting from each end side to a slightly smaller diameter up to the seat plate setting positions on both end sides of the rod body, The step is cut at a slight angle, knurling is performed on the small diameter side of the step, and the small diameter portion on both ends of the rod is fitted with a seat plate that has been punched and reamed. The rods with seat plates fitted at both ends are a fixed plate fixedly installed on the machine body, sliding plates arranged on the left and right sides of the fixed plate, and a groove for positioning the seat plates by fitting them in the central longitudinal direction. In addition, slidable pressing plates are provided on the back and sliding plates are provided on the front side, and guide rods of return springs are provided on the front side toward the fixed plate. The seat plate is provided with an elevating and lowering plate having a c-shaped pressing surface formed on the same slope as the pressing surface. Is pressed into the stepped position, and the small diameter portion on both ends of the rod body is subjected to screw processing by a screw rolling machine consisting of a pair of screw rollers with engraved screws, and then a conical punch and cushion pad that can be raised and lowered. And a method of manufacturing a U-shaped bolt with a seat plate in which a rod and a punch are used to position and hold the rod body by a bending machine including a pair of guide rollers, and the rod body is bent into a U shape when the punch descends.