JP2003136156A - Method for punching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for punching by suppressing the occurrence of a cutting scum or burr in the case of batch punching a plurality of holes and easily removing the generated scum or the burr. SOLUTION: The method for punching a plurality of holes comprises the steps of coating a pipe 1 of a material to be worked on a support pole 12, and punching the plurality of the holes at the side face of the pipe 1. The method further comprises the steps of arranging punch units 14, 18 having first punches 17a, 21a, second punches 17b, 21b and third punches 17c, 21c so as to interpose the pole 12 between the punch units 14 and 18, punching the plurality of the holes with a deviation of a slight time when the punch units 14, 18 are moved toward the pole 12 mounting the pipe 1, and removing the generated scrum 31 to the cavity 8 in the pole 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling method for forming a plurality of holes on the surface of various pipes.

[0002]

2. Description of the Related Art A large number of thin pipes are arranged inside an automobile or an air conditioner, and are branched in various directions. Since such pipes are mainly made of a metal material and are piped while branching into a limited space, a plurality of holes are often provided on the surface of the pipe in a state where the intervals are narrowed. Conventionally, such a plurality of holes are drilled in a metal pipe by drilling one by one with a drilling machine or by simultaneously using a multi-axis drilling machine equipped with a plurality of drills. It was common to open it.

[0003]

However, in the processing method using the drilling machine as described above, shavings and burrs are generated, so that the processed surface cannot be finished cleanly. Further, when a plurality of multi-axis drilling machines are used to open a plurality of holes at the same time, a large amount of shavings and burrs generated during drilling will clog the pipes and hinder drilling work. For this reason, it is necessary to perform the drilling work while sequentially removing these scraps and burrs, which causes a decrease in work efficiency.

Further, since a plurality of holes are simultaneously drilled in the pipe, there is a possibility that the fixing position of the pipe may be displaced during the drilling, and the machining position or the dimensional accuracy is lowered.

Further, in a processing apparatus equipped with a drill such as a drilling machine, it is necessary to provide a driver space for fixing each drill, so that it is difficult to arrange the drills with a narrow interval. For this reason, a method of making a hole while moving the pipe, which is the work piece, toward the fixed drill is taken, but it is difficult to accurately control the movement of the pipe with this method, and the processing time There was also a problem that it took a lot of money.

Therefore, a first object of the present invention is to prevent the generation of shavings and burrs when a plurality of holes are collectively formed, and to easily remove the generated shavings and burrs. It is to provide a processing method.

A second object of the present invention is to provide a drilling method in which the accuracy of processing is improved by suppressing the deviation of the workpiece when the hole is drilled.

A third object of the present invention is to provide a drilling method capable of collectively punching workpieces without moving the workpieces when punching a plurality of holes at narrow intervals. is there.

[0009]

In order to solve the above-mentioned problems, according to a drilling method of a first aspect of the present invention, a support pillar is covered with a cylindrical work piece, and the support pillar is turned toward this work piece. A method of projecting a punch to form a hole in a side surface of a workpiece, wherein a plurality of the punches are arranged along the support column,
When the plurality of punches are projected, a plurality of holes are formed with a slight deviation in the time when the tips reach the side surface of the workpiece.

According to the present invention, when a plurality of holes are formed on the side surface of the work piece, the tips of the punches do not reach the side surfaces of the work piece at the same time, and there is a slight time lag between the work piece. Since it is projected to, the scraps and burrs can be sequentially removed from the punched holes. Therefore, a large amount of shavings and burrs do not clog the inside of the workpiece, and the drilling work can be performed smoothly. Further, since a plurality of holes are punched with a time difference, the force applied to the punch portion can be dispersed.

According to a second aspect of the present invention, in the boring method according to the first aspect, a hollow portion is formed inside the support column, and dregs when the hole is bored in the workpiece are used as the hollow portion. Characterized by dropping.

According to this invention, since the hollow portion is provided inside the support column, the scraps and burrs at the perforated portion fall into the hollow portion, and the labor of the removing work can be saved.

According to a third aspect of the present invention, in the punching method according to the first aspect, the tips of the plurality of punches are arranged with a slight distance from the side surface of the workpiece. When the plurality of punches are projected at the same time, a slight deviation occurs in the time when the tips of the punches reach the side surface of the workpiece.

According to the present invention, since the tips of the plurality of punches are arranged with a slight distance from the side surface of the workpiece, the timing of punching the workpiece can be easily shifted. You can

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a drilling method according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an outline view of a pipe before and after being processed by the drilling method of the present invention, and FIG. 2 is an explanatory view showing the principle of drilling.

The drilling method of the present invention is shown in FIG.
As shown in (b), it is intended to process relatively small pipes arranged inside an automobile, an air conditioner or the like. Such a pipe 1 has a hollow inside, and a plurality of holes 2 for connecting other pipes are formed in the outer surface of the pipe 1 at narrow intervals. In this embodiment, a hollow pipe 1 having a constant wall thickness as shown in FIG.
A pipe 1 having a plurality of holes 2 as shown in FIG.
To form. As an example of drilling, the holes 2 to be drilled are round holes having a diameter of about 5 mm, and the distance between the holes 2 is set to 1 mm or less. Then, three holes 2 were provided in the longitudinal direction of the pipe 1, and three holes 3 were provided on the surface facing the pipe 1 at a regular interval. Hereinafter, a device configuration and a processing method for forming the hole 2 will be described.

In order to make a plurality of holes 2, a hole making device 11 as shown in FIG. 2 is used. The punching device 11 has a support column 12 on which a pipe 1 as a workpiece is mounted, a pressing base 13 for pressing the pipe 1 mounted above the support column 12, and a support column 12 sandwiched between them. It is composed of a pair of punch portions 14 and 18.

The punch section 14 supports a group of punches 15 arranged in a direction orthogonal to the side surface of the support column 12, and a punch body section that supports the punch group 15 and is movable toward the support column 12. 16 and. The punch group 15 is composed of three punches, and the first punch 17a, the second punch 17b, and the third punch 17c are arranged in a line at equal intervals from below the punch body 16. As shown in the drawing, the lengths of the punches are different from each other, and the first punches 17a on the lower side are sequentially shorter.

On the other hand, the punch portion 18 located on the right side of the support column 12 has the same structure as the punch portion 14, and has a first punch 21a, a second punch 21b, and a third punch 21c.
The punch group 19 and the punch main body 20 that fixes the punch group 19 are configured. The pair of punch portions 14 and 18 are arranged in symmetrical positions with the support column 12 in between.

The support column 12 sandwiched between the pair of punch portions 14 and 18 is formed in a cylindrical shape from a thick steel material having a hollow portion 8 inside, and is perpendicular to a flat work table 9. It is provided so as to project. Then, the punch group 1 is provided on the side surface thereof.
5, a through hole portion 22 corresponding to No. 5 is provided, and a first hole portion 23a, a second hole portion 23b, and a third hole portion 23c are provided from below. A through hole portion 24 corresponding to the punch group 19 is provided at a position facing the through hole portion 22.
The hole 24a, the second hole 24b, and the third hole 24c are provided.

In the punching device 11, the pipe 1 in which the pair of punch portions 14 and 18 are mounted on the support column 12 is used.
When the punch groups 15 and 19 are pushed with a strong force toward the base plate, a difference in length between the punches causes a difference in time for penetrating the plate thickness of the single wall of the pipe 1. By thus forming a plurality of holes with a certain time difference, it is possible to sequentially drop and remove the generated shavings and burrs in the hollow portion 8 of the support column 12. In order to shift the time for penetrating the pipe 1, it is necessary to set the difference in the length of the punch to be equal to or more than the wall thickness of the pipe 1 to be processed. However, if the lengths are made too different, it takes time to open all the holes, and the work efficiency is reduced. Therefore, it is preferable to provide a difference about the same as the wall thickness of the pipe 1.

Next, the procedure for making a predetermined hole in the pipe 1 which is the workpiece by using the hole making device 11 will be described with reference to FIGS. 2 to 8. The pipe 1 is attached to the support column 12 of the drilling device 11 (FIG. 3). The upper surface of the pipe 1 is sandwiched between the fixing portions 10 of the pressing base 13 and the pipe 1 is firmly fixed so as not to shift (FIG. 4). The punches 14 and 18 are pushed toward the support columns 12 from the left and right with a strong force toward the through holes 22 and 24 formed in the support columns 12 by the pressure of the electric motor or the hydraulic valve (FIG. 5). First, the first punches 17a and 21a at the lowermost end penetrate the pipe 1 to open lower holes. The shavings 31 generated at that time fall into the hollow portion 8 of the support column 12. The second punches 17b and 21b are in contact with the surface of the pipe 1. When the punch portions 14 and 18 are further pushed in from the above state, the second punches 17b and 21b penetrate the pipe 1 to open the second hole from the bottom (FIG. 6). Reference numeral 32 is a shaving residue generated at that time, and falls into the cavity 8 after the shaving residue 31. At this time, the first punches 17a, 2
Although 1a is in a state of completely penetrating the first hole portions 23a and 25a of the support column 12, the third punches 17c and 21c are still in contact with the surface of the pipe 1. When the punch portions 14 and 18 are further pushed in from the above state, the third punches 17c and 21c penetrate the pipe 1 to open the uppermost hole (FIG. 7). Reference numeral 33 is a shaving generated at that time, and drops into the hollow portion 8 following the shaving 32. At this time, the second holes 23b and 25b
Is also completely penetrated by the second punches 17b and 21b. After all the holes have been opened, the punch unit 1
The pipes 1 and 4 are moved to their original positions and the pipe 1 on which the perforation process has been performed is taken out (FIG. 8).

As described above, in the drilling method of the present invention, a plurality of holes 2 are formed in the pipe 1, which is the workpiece.
When punching holes, punch groups 15, 18 having different lengths are provided in punch portions 14, 18 arranged toward the pipe 1.
Since the holes 19 are drilled with a slight time lag, the generated scraps and burrs can be sequentially removed from the drilled portion. Therefore, as compared with the conventional case where a plurality of punches are punched at the same time, scraps and burrs can be discharged smoothly, and the pipe 1 and the processing device are not clogged. Further, since the plurality of holes 2 are punched from the punch portions 14 and 18 with a time lag, the load applied to the pipe 1 is dispersed, so that deformation during processing can be suppressed and the punch portions 14 and 18 can be suppressed. It is possible to reduce the load on the device by dispersing the force applied to the device.

In the above embodiment, the workpiece is tubular like a pipe, and the holes to be drilled are set at six symmetrical positions along the longitudinal direction of the workpiece. By changing the configuration, it is possible to make many holes. Further, the positions of the holes to be drilled are not limited to the left-right symmetrical positions with the center line of the workpiece being sandwiched therebetween, and three or more holes may be provided. However, when processing
In order to perform the work accurately without blurring, it is necessary that the center of the force required for working be directed to the center axis of the work.

[0025]

As described above, according to the hole drilling method of the present invention, when the plurality of holes are formed in the side surface of the workpiece, the tip of the punch reaches the side surface of the workpiece at the same time. Instead, they are projected onto the work piece with a slight time lag, so that scraps and burrs can be sequentially removed from the punched holes. Therefore, a large amount of shavings and burrs do not clog the inside of the workpiece, and the drilling work can be performed smoothly.

Further, since the hollow portion is provided inside the support column, shavings and burrs at the perforated portion fall into the hollow portion, and the labor of the removing work can be saved.

[Brief description of drawings]

FIG. 1 is an external view of a pipe processed by a drilling method of the present invention.

FIG. 2 is a conceptual diagram of a punching device of the present invention.

FIG. 3 is a cross-sectional view showing a state where a pipe is set in the punching device.

FIG. 4 is a cross-sectional view showing a state in which the set pipe is fixed.

FIG. 5 is a cross-sectional view showing a state in which the pipe is perforated by a first punch.

FIG. 6 is a cross-sectional view showing a state in which the pipe is punched with a second punch.

FIG. 7 is a cross-sectional view showing a state where the pipe is perforated by a third punch.

FIG. 8 is a cross-sectional view showing a state in which the drilling of the pipe has been completed.

[Explanation of symbols]

1 Pipe (workpiece) 2 holes 8 cavity 11 Drilling machine 12 Support pillars 14,18 Punch part 17a, 21a 1st punch 17b, 21b 2nd punch 17c, 21c 3rd punch 31, 32, 33 Shavings

Claims (3)

[Claims] 1. A method of covering a support pillar with a cylindrical work piece, projecting a punch toward the work piece, and forming a hole in a side surface of the work piece. Plural holes are arranged along the pillar, and when these plural punches are projected, there are slight deviations in the time when their tips reach the side surface of the workpiece, and plural holes are bored. A drilling method characterized by. 2. The drilling method according to claim 1, wherein a hollow portion is formed inside the support column, and dregs when the hole is drilled in the workpiece are dropped into the hollow portion. 3. When the tips of the plurality of punches are arranged at a slight distance from the side surface of the work piece so that the plurality of punches are simultaneously projected,
The drilling method according to claim 1, wherein a slight deviation is caused in a time when the tips reach the side surface of the workpiece.