JPH0810868A - Method for drilling hollow shaped material - Google Patents

Abstract

PURPOSE:To improve the productivity by executing perforating of a through hole for working and attaching with a press punching system without using a die. CONSTITUTION:An outer flange face 1f of a Banbury enforcement 1 is punched with a press and a large working piercing hole ld is formed by moving a 1st punch member 6 to the direction of a 2nd punch member 8. When a punching face 6c of the 1st punch member 6 is brought in contact with an internal flange face 1g, the movement of the 1st punch member 6 is stopped, the internal flange face 1g is punched with the press and the small attaching piercing hole 1e is formed by moving the 2nd punch member 8 to the direction of the 1st punch member 6 while making the punching face 6c of the 1st punch member 6 bring into contact with the internal flange face 1g.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-diameter through-hole and a small-diameter through-hole so that a small-diameter through-hole has a high dimensional accuracy on one surface and the other surface of a hollow member to be bent. The present invention relates to a method for forming a hole in a hollow shape member for coaxially forming the above.

[0002]

2. Description of the Related Art Hollow frame members are used in various fields, and a typical example thereof is a bumper reinforcement which is a constituent member of a bumper device for automobiles. A bumper device for an automobile usually has a bumper resin molded product, a lamp, etc. as constituent members in addition to bumper reinforcement.
It is fitted into and supported by a through hole formed in the bumper reinforcement.

Further, bumper reinforcement is
It can be attached to the vehicle body via a stay or the like, or can be attached to the side member of the vehicle. The attachment method is to form a through hole for work on the outer flange surface of the bumper reinforcement. , A mounting through hole with a smaller diameter than the working through hole is formed coaxially with the inner flange surface, and after aligning the mounting through hole with the mounting site such as the stay or side member, the screw member is penetrated through the work. The holes are inserted into the mounting through holes and screwed into the female screw portion of the mounting portion.

As described above, the bumper reinforcement is usually formed with a large number of through holes, and when forming these through holes, the following drilling method has been conventionally used. ing. That is, the first punching method is, as shown in FIG. 6, a press punching method in which a die 51 is inserted into a bumper reinforcement 52 and punched from above with a punch 53 having a predetermined shape to form a through hole. However, this method is often used when forming an elliptical through hole for a lamp or the like. Also,
A second drilling method is a drill method in which a through hole is formed by cutting with a drill, and this method is generally adopted when forming a circular through hole for work or mounting. Has been done.

[0005]

By the way, in recent years, the bumper reinforcement 52 is often subjected to a bending process due to a design to cope with an oblique collision and a design limitation, and such a bumper reinforcement 52 is often used. When 52 is punched by the press punching method, press punching is performed by adding a press step before the bending step, or by punching after setting the curved surface by inserting a movable die after the bending step. Since it has to be done, there is a problem that productivity is greatly reduced.

Therefore, as shown in FIG. 7, the middle rib 54. of the bumper reinforcement 52 is used for drilling a relatively large size oval lamp lamp or the like.
54 as a die and the punch 53 as a medium rib 54.
Japanese Patent Laid-Open No. 1-13
It is disclosed in Japanese Patent No. 3619. According to this punching method, since punching is performed without using a die, productivity is improved, punching can be performed after bending, and the degree of freedom in line configuration is also improved.

However, like the through holes for working and mounting which are formed on the outer flange surface and the inner flange surface of the bumper reinforcement 52, the inner ribs 54, 54 have a diameter that cannot be used as a die. When the through hole is formed, if the above-described processing method is applied, a recess is formed around the through hole, and the dimensional accuracy of the through hole is reduced. Therefore, when forming a mounting through hole that requires high dimensional accuracy without using a die, it is necessary to perform drilling using a drill method, and conventionally, high dimensional accuracy is not required. Work through holes are also drilled by a drilling method.

The above-mentioned drilling method for drilling has improved working efficiency with the recent progress of NC (Numerical Control), but requires a cutting time, so that it is compared with the ordinary press punching method. Productivity has declined. Therefore, focusing on the fact that the work through hole and the mounting through hole exist on the same axis, by using a step drill, the work through hole and the mounting through hole are simultaneously drilled to improve productivity. Although a method of improving it is conceivable, in this case, the tool life and the tool cost of the step drill will increase the production cost.

As described above, in the conventional drilling method,
Bumper reinforcement 52 that is bent
For punching large diameter and small diameter through-holes on both sides of a hollow shaped material such as, for example, with high dimensional accuracy, press punching using a movable die It is necessary to drill both through holes by the method or drill method, which is a big problem when improving the productivity. Therefore, the present invention is to provide a method for punching a hollow shape member capable of improving the productivity by enabling the punching of both through holes by a press punching method without using a die. It is what

[0010]

In order to solve the above-mentioned problems, a large-diameter through hole having a small diameter is formed on one surface and the other surface of a hollow shaped member to be bent so as to have a high dimensional accuracy. And a small-diameter through hole are formed coaxially, and have the following features.

That is, the second punch member having a punching surface corresponding to the small-diameter through hole at the tip portion and the punching surface corresponding to the large-diameter through hole at the tip portion, the punching surface having the above-mentioned The first punch member having a housing portion capable of housing the tip portion of the second punch member is coaxially arranged on both sides of the hollow shape member so that the punching surfaces face each other.
By moving the first punch member toward the second punch member, one surface of the hollow shape member is press-punched to form a large-diameter through hole, and the punching surface of the first punch member is hollow. When the second punch member is brought into contact with the other surface of the material, the movement of the first punch member is stopped, and the punching surface of the first punch member is brought into contact with the other surface of the hollow shape member while the second punch member is moved to the above It is characterized in that the other surface of the hollow shape member is press-punched to form a through hole having a small diameter by moving in the direction of the first punch member.

[0012]

As a result, by supporting the other surface of the hollow shape member by the punching surface of the first punch member obtained by press-punching the one surface of the hollow shape member, and pressing the other surface by the second punch member, It is possible to form a small-diameter through hole with high dimensional accuracy.
Therefore, since both through holes are formed by press punching without using a die, it is possible to improve productivity as compared with the case of forming by a press punching method or a drill method using a movable die. Has become.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3, the method for forming a hole in a hollow shape member according to the present embodiment is used, for example, when forming a through hole in a bumper reinforcement 1 (hollow shape member) of a bumper device for an automobile. Has become. The bumper reinforcement 1 is composed of a straight portion 1a arranged parallel to the vehicle width direction and a pair of projecting portions 1b and 1b bent from both ends of the straight portion 1a toward the vehicle body. Extruded profile and drawn profile,
It is formed so as to have a uniform cross section in the length direction by using a press-worked material of a steel plate, a welded assembly material, or a composite material of these members. The bumper reinforcement 1 is provided with reinforcing middle ribs 2, 2 inside in two steps, and has a cross-sectional shape of "eye".

On the outer flange surface 1f of the overhanging portions 1b, 1b of the bumper reinforcement 1 described above,
Through holes 1c, 1c into which the lights 3 are fitted are formed respectively. In addition, from the overhanging portions 1b and 1b to the straight portion 1
A plurality of work through-holes 1d, which do not require high dimensional accuracy, are formed on the outer flange surface 1f bent to a, and the inner flange surface 1g coaxial with the work through-holes 1d. , The through-hole 1e for mounting, which has a smaller diameter than the through-hole 1d for working and requires high dimensional accuracy.
... are formed. A screw member 5 is inserted into each of the mounting through holes 1e, and the screw member 5 is screwed into the female screw portion 4a of the stay 4 that is in contact with the inner flange surface 1g, so that the bumper reinforcement is strengthened. The ment 1 and the stay 4 are fixed to each other.

The work through hole 1d and the mounting through hole 1e of the bumper reinforcement 1 are formed by a press punching device. As shown in FIGS. 1 and 2, the press punching device includes a mounting table 10 on which the bumper reinforcement 1 is mounted,
Cylindrical first punch member 6 having a punching surface 6c corresponding to the large-diameter work through hole 1d at its tip, and a punching surface 8b corresponding to the small-sized mounting through hole 1e at the tip. The second punch member 8 of FIG.

The mounting table 10 has an insertion hole 10a through which the second punch member 8 can be inserted. A first punch member 6 is provided above the insertion hole 10 a, and the first punch member 6 is provided with a first holder (not shown) via a first holder 7.
It is provided in the pressing means. Then, the first pressing means lowers the punch member 6 from above the bumper reinforcement 1 mounted on the mounting table 10 to punch out the outer flange surface 1f, and then the punching surface 6c contacts the inner flange surface 1g. When they come in contact with each other, the descent is stopped and fixed.

The punched surface 6c of the punch member 6 is
It is formed in a flat shape so as to be parallel to the inner flange surface 1g, and a housing portion 6a capable of housing the tip portion of the second punch member 8 is formed in the center portion. Accommodation part 6a
Is connected to one end of an air supply hole 6b formed inside the first punch member 6, and the other end of the air supply hole 6b is connected to an unillustrated first via an air supply path in the first holder 7. 1 Pneumatic feeding means. Then, as shown in FIG. 1, when the first punch member 6 punches out the outer flange surface 1f, the first air pressure feeding means pressure feeds air to the housing portion 6a via the air supply hole 6b. The punching piece 11 remaining on the punching surface 6c is blown off and removed.

On the other hand, a second punch member 8 is provided below the insertion hole 10a of the mounting table 10, and the punching surface 8b of the second punch member 8 faces the punching surface 6c of the first punch member 6. The first punch member 6 is coaxially arranged. The second punch member 8 has a second holder 9
Is provided in the second pressing means (not shown) via
The second pressing means lifts the second punch member 8 from below the insertion hole 10a to punch out the inner flange surface 1g, and then stores the tip of the second punch member 8 in the housing portion 6a of the first punch member 6. It is designed to let you.

An air supply hole 8a is formed inside the second punch member 8, and one end of the air supply hole 8a is located on the punching surface 8b of the second punch member 8. On the other hand, the other end of the air supply hole 8a is connected to a second air pressure feeding means (not shown) via an air supply path in the second holder 9, and the second air pressure feeding means, as shown in FIG. After the second punch member 8 punches out the inner flange surface 1g, when the first punch member 6 moves up, the air supply hole 8
Air is pressure-fed to the punching surface 8b of the second punch member 8 through a so that the punching piece 11 remaining on the punching surface 8b is blown away and removed.

In the above structure, a bumper reinforcement 1 is prepared by using an extruded profile of 6000 series aluminum alloy having a wall thickness of about 2 mm, and the outer flange surface 1f and the inner flange surface 1g of the bumper reinforcement 1 are Work through hole 1 that is a round hole with a diameter of 20 mm
A drilling method will be described through the operation of the press punching device when forming d and the mounting through hole 1e, which is a circular hole having a diameter of 8 mm, respectively.

First, as shown in FIG. 1, a first punch member 6 having a punched surface 6c of 20 mm corresponding to the large-diameter work through hole 1d and the small-diameter mounting through hole 1e, respectively. The second punch member 8 having the punching surface 8b of 8 mm is attached to the first holder 7 and the second holder 9 of the press punching device, respectively. The accommodating portion 6a of the first punch member 6 has a gap of 0. 0 when the second punch member 8 is accommodated in consideration of the mounting accuracy of the first and second punch members 6 and 8 and the deviation.
It is formed to be about 5 mm.

After that, when the bumper reinforcement 1 having both ends bent is automatically conveyed and positioned on the mounting table 10, the first punch member 6 descends (second
The first punch member 6 is moved toward the punch member 8).
By punching out the outer flange surface 1f of the bumper reinforcement 1 with the punched surface 6c, a working through hole 1d having a diameter corresponding to the punched surface 6c is formed in the outer flange surface 1f. At this time, during press punching with the first punch member 6, since the inner side of the outer flange surface 1f is not supported by a die or the like, a recess (a recess amount of about 1 mm) is formed around the work through hole 1d. However, this is not a problem for the working through-hole 1d that does not require dimensional accuracy and is used for tool insertion and screwing work.

The first punch member 6 will continue to descend even after the outer flange surface 1f is punched out. When the descent is continued, the punching piece 11 remaining on the punching surface 6c is blown off by the pressure-feeding air from the first air pressure feeding means (not shown) to the fitting portion 6a through the air supply hole 6b. Will be removed. After that, when the punching surface 6c of the first punch member 6 comes into contact with the inner flange surface 1g, the first punch member 6 is stopped and fixed.

Next, as shown in FIG. 2, the second punch member 8 located below the mounting table 10 is lifted (moved toward the first punch member 6), and the punching surface of the second punch member 8 is moved. By punching the inner flange surface 1g by 8b, a mounting through hole 1e having a diameter corresponding to the punched surface 8b is formed in the inner flange surface 1g. At this time, when press punching with the second punch member 8, the inside of the inner flange surface 1g is the punching surface 6 of the first punch member 6.
Since it is in the state of being supported by c, no recess is formed around the mounting through hole 1e. Therefore, the mounting through hole 1e is formed in the inner flange surface 1g with high dimensional accuracy. Further, at the time of press punching by the second punch member 8, since the tip end portion of the second punch member 8 is accommodated in the accommodation portion 6a of the first punch member 6,
When the tip end portion of the punch member 8 is lifted above the inner flange surface 1g, the first punch member 6 that supports the inner flange surface 1g instead of the die does not become an obstacle.

After that, the first punch member 6 is raised, and the tip of the second punch member 8 is moved to the receiving portion 6 of the first punch member 6.
When removed from a, air is pressure-fed to the punching surface 8b of the second punch member 8 from the second air pressure feeding means (not shown) through the air supply hole 8a, and the punching piece 11 remaining on the punching surface 8b is blown off. Will be removed.

In the present embodiment, the punching surface 6c of the first punch member 6 is formed in a flat shape, but it is not limited to this. That is, the punching surface 6c of the first punch member 6 may be formed in an oblique blade shape or a horseshoe shape as shown in FIGS. 4 and 5, and in this case, the recess amount is 0.2 mm or less. It becomes possible to suppress.

As described above, according to the drilling method of this embodiment, as shown in FIGS. 1 and 2, the outer flange surface 1f (one side surface) of the bumper reinforcement 1 (hollow shape member) to be bent is processed. ) And the inner flange surface 1g (the other surface) are coaxially provided with a large diameter working through hole 1d and a small diameter mounting through hole 1e so that the small diameter mounting through hole 1e has high dimensional accuracy. In order to form the sheet, press punching is performed by the following procedure.

That is, the second punch member 8 having a punching surface 8b corresponding to the small-diameter mounting through hole 1e at the tip thereof.
And a punching surface 6 corresponding to the large-diameter work through hole 1d
A first accommodating portion 6c having a front end portion c and a punching surface 6c in which a front end portion of the second punch member 8 can be accommodated is formed.
The punch member 6 is coaxially arranged on both sides of the bumper reinforcement 1 so that the punching surfaces 6c and 8b face each other, and the first punch member 6 is moved in the direction of the second punch member 8 to obtain the bumper reinforcement. When the outer flange surface 1f of the ment 1 is press-punched to form a large-diameter through hole 1d for working and the punched surface 6c of the first punch member 6 abuts the inner flange surface 1g,
While stopping the movement of the punch member 6 and bringing the punching surface 6c of the first punch member 6 into contact with the inner flange surface 1g,
By moving the punch member 8 in the direction of the first punch member 6, the inner flange surface 1g is press-punched to form a small-diameter mounting through hole 1e.

As a result, the inner flange surface 1g is supported by the second punch member 8 while the inner flange surface 1g is supported by the punching surface 6c of the first punch member 6 obtained by press-punching the working through hole 1d which does not require dimensional accuracy. Since it is designed to be punched by a press, no recess is formed around the mounting through hole 1e formed by the punching of the second punch member 8, and the mounting through hole 1e has a high dimensional accuracy. It will be formed to 1 g. Therefore, the work through-hole 1d and the mounting through-hole 1e are formed by press punching without using a die, so that both through-holes 1d and 1e are formed by a press punching method or a drill method using a movable die. It is possible to improve productivity as compared with the case of doing.

[0030]

As described above, according to the present invention, the second punch member having the punching surface corresponding to the small-diameter through hole at the tip portion and the punching surface corresponding to the large-diameter through hole at the tip portion are provided. A first punch member having an accommodating portion formed on the punching surface, the accommodating portion capable of accommodating the tip end portion of the second punch member,
By arranging coaxially on both sides of the hollow shape member so that the punching surfaces face each other, and moving the first punch member in the direction of the second punch member, one surface of the hollow shape member is press-punched. A large-diameter through hole is formed, and when the punching surface of the first punch member comes into contact with the other surface of the hollow shape member, the movement of the first punch member is stopped and the punching of the first punch member is performed. By moving the second punch member toward the first punch member while abutting the surface against the other surface of the hollow shape member, the other surface of the hollow shape member is press-punched to form a through hole having a small diameter. This is the configuration.

As a result, the punching surface of the first punch member, which is formed on one surface by press punching of a large-diameter through hole that does not require dimensional accuracy, supports the other surface of the hollow shape member while supporting the other surface of the second punch. Since the member is press-punched with a member, the small-diameter through hole formed by press-punching the second punch member is formed with high dimensional accuracy. Therefore, since both through holes are formed by press punching without using a die, it is possible to improve productivity as compared with the case where a press punching method or a drill method using a movable die is applied. Has the effect of being.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a drilling method of the present invention.

FIG. 2 is an explanatory diagram showing a drilling method of the present invention.

FIG. 3 is a perspective view of a bumper reinforcement.

FIG. 4 is an explanatory view showing a shape of a punching surface of a first punch member.

FIG. 5 is an explanatory diagram showing a shape of a punching surface of a first punch member.

FIG. 6 is an explanatory diagram showing a conventional drilling method.

FIG. 7 is an explanatory diagram showing a conventional drilling method.

[Explanation of symbols]

 1 Bumper Reinforcement 1a Straight part 1b Overhanging part 1d Work through hole 1e Mounting through hole 1f Outer flange surface 1g Inner flange surface 3 Light 4 Stay 5 Screw member 6 1st punch member 6a Storage part 6b Air supply hole 6c Punching Surface 7 first holder 8 second punch member 8a air supply hole 8b punching surface 9 second holder 10 mounting table 11 punching piece

Claims (1)

[Claims] 1. A large-diameter through hole and a small-diameter through-hole are coaxially formed on one surface and the other surface of a hollow shaped member to be bent so that the small-diameter through hole has high dimensional accuracy. In the method for boring a hollow shaped member, a second punch member having a punching surface corresponding to the small-diameter through hole at the tip and a punching surface corresponding to the large-diameter through hole at the tip. A first accommodating portion is formed on the punching surface for accommodating the tip portion of the second punch member
The punch member and the punch member are coaxially arranged on both sides of the hollow shape member so that the punching surfaces face each other, and the first punch member is moved in the direction of the second punch member to obtain one of the hollow shape members. When the punching surface of the first punch member comes into contact with the other surface of the hollow shape member, the movement of the first punch member is stopped, While the punching surface of the first punch member is brought into contact with the other surface of the hollow shape member, the second punch member is moved in the direction of the first punch member, so that the other surface of the hollow shape member is press-punched to have a small diameter. A method for boring a hollow shape member, which comprises forming a through hole.