JP2591390B2 - Hole punch type - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large number of plate-like materials such as side rails and cross members which constitute a chassis frame of a truck, a tractor, etc., for inserting a fastener such as rivets or bolts into a large number of plate-like materials. The present invention relates to a punching die suitable for punching a hole with a press.

[0002]

2. Description of the Related Art Conventionally, medium and large-sized trucks, tractors and the like have a pair of left and right side rails extending in the front-rear direction of the vehicle body, and extend in the vehicle width direction and have both ends attached to the side rails by rivets or bolts. Ladder-shaped underframes composed of a plurality of fixed cross members are widely used. The side rails of the chassis frame are usually formed of a steel plate channel having a thickness of about 6 to 8 mm,
Further, the cross member is formed of a grooved material, a working material, a hat-shaped press-formed product or the like of a steel plate having a thickness of about 4 to 6 mm.

[0003] The side rail and the cross member include:
A number of holes are provided to insert rivets and bolts to connect the two together and to mount engines, suspension devices, and various other components. As is well known in the art, in the case of medium and large trucks, a large number of series models are manufactured for one basic model with different specifications such as the type and size of parts to be mounted, such as an engine. Normally, in order to reduce the manufacturing cost, the basic model and the series model use an essentially common chassis frame, and the side rails and the cross members have a large number of holes for inserting the rivets and bolts. A powerful punch using a punching die consisting of an upper die adapter or a punch holder provided with a number of punches for punching holes, and a lower die adapter or a die holder having a die with a die hole cooperating with each of the punches. Processed by pressing.

[0004] A typical configuration of the above-mentioned hole punching die, which has been widely adopted in the past, will be described with reference to FIG. Symbol 1 in the figure
0 is a lower mold adapter or die holder which is attached to a press bed or a lower mold mounting base by an appropriate fixing means;
Is a die mounted on the lower adapter 10;
The die 12 is provided with a large number (only two are shown for simplicity) of a die bush 18 having punched holes 16 for punching holes in cooperation with a punch 14 in accordance with a desired hole arrangement pattern. It is arranged. An upper adapter or a punch holder 20 is attached to the shank or ram of the press so as to face the lower adapter 10.
A large number of punches 14 are provided on a punch plate 22 which is detachably mounted on the lower surface of the punch guide 2 according to a desired hole arrangement pattern.
4 attached. A guide plate 28 is disposed below the punch plate 22 via an elastic member 26 such as rubber or a spring. The guide plate 28 is connected to the upper mold adapter 20 via a guide member such as a guide post (not shown). It is configured to move up and down together with.

[0005] In the case of drilling a side rail or a cross member of a chassis frame using the punching die having the above structure, a plate material B having a thickness of about 4 to 8 mm first.
Is mounted at a predetermined position on the upper surface of the die 12. Next, when the upper mold adapter 20 attached to the shank or ram of the press descends toward the die 12, the guide plate 28 abuts on the upper surface of the plate-shaped material B and presses the same material B. By lowering the elastic member 26 while compressing it, the punches 14 cooperate with the punched holes 16 of the die bush 18 to make a hole in the material B. FIG. 3 shows a state in which the punching by the punch 14 is completed, and thereafter, the upper die adapter 20 moves up together with the punch 14, and the small-diameter punched portion of the punch 14 comes out of the punched hole, and the drilling process is completed. . While the punched portion of the punch 14 escapes from the punched hole of the material B, the material B is pressed by the elastic member 26, so that the punch can escape smoothly.

[0006] The punch plate 22 on which the large number of punches 14 are mounted has a lateral dimension of 50 cm or more in FIG. 3 depending on the case, and a dimension perpendicular to the plane of FIG. It is a large and heavy member, and its price is obviously high.
Since a lot of time is required to attach and detach the punch plates, preparing a large number of types of punch plates 22 having different hole arrangement patterns for each of the above-mentioned series models will significantly increase the manufacturing cost. Therefore, after forming a large number of common punched holes including all hole arrangement patterns in the material B so that the material B can be shared by many types of vehicles, for example, in the case of a side rail, the material B is bent into a groove shape. Processed. Thereafter, for each specific vehicle type, a necessary one of a number of punched holes is selected to connect the side rail to the cross member, and other parts are attached. The remaining punched holes are so-called discarded holes. Left as. As an example, when investigating a certain vehicle type, among the punched holes in the chassis frame, the holes actually used are about 60-70% of the whole,
The remaining 30 to 40% was discarded. as mentioned above,
The existence of a large number of discarded holes inevitably adversely affects the strength of the chassis frame itself, and there is a problem that erroneous assembly is apt to be performed using the wrong hole when mounting parts and the like. There is a problem that the user of a truck or the like fosters vague anxiety and distrust, such as insufficient strength and insufficient mounting of parts.

In order to solve the various problems associated with the above-mentioned disposal hole, the present applicant has previously proposed an improved punching die as shown in FIG. In this proposed hole punching die, a large number of punches 14 are mounted so as to be freely slidable in the punch axis direction, that is, in the vertical direction in the figure, with respect to the punch plate 22. Corresponding to the hole arrangement pattern of the vehicle type, a shallow recess 30 for accommodating the punch head 14a is provided for the punch 14 to punch a hole in the material B so that displacement in the axial direction is prohibited. Head 14 of punch 14 corresponding to a discard hole
The portion corresponding to a is provided with a deep recess 32 that allows the punch to be displaced in the axial direction.

As shown in the figure, when the plate-shaped material B is mounted on the upper surface of the die 12 mounted on the lower adapter 10 and the upper adapter 20 is lowered, the head 14a is accommodated in the shallow recess 30. The punch 14 is operated as usual and punches a hole in the material B, and the punch 14 whose head 14a is accommodated in the deep recess 32 moves idly in the axial direction. It is not punched out and therefore no dump holes are created. Adopting this improved hole punching die has the advantage of eliminating all of the various problems associated with the dump hole. However, for each model with different punch hole arrangement patterns,
Since a large number of large and heavy upper adapters 20 must be prepared, there is a drawback that a large increase in manufacturing cost cannot be avoided. Further, in order to cope with a slight change in the hole position that is frequently performed everyday, for example, a movement of several millimeters, the punch guide hole 34 through which the punch 14 of the punch plate 22 is slidably inserted is temporarily filled even in the same model. Since it is necessary to perform the re-drilling again, it has been found that there is a lack of flexibility with respect to a slight design change, which eventually leads to an increase in the chassis frame manufacturing cost, and that further improvement is required.

[0009]

SUMMARY OF THE INVENTION The present invention not only solves the various disadvantages caused by the existence of the above-mentioned discarded holes, but also improves the disadvantages of the above-mentioned hole punching dies, thereby manufacturing a chassis frame and the like. It is an object of the present invention to provide a punching die of this kind that can further reduce the cost.

[0010]

SUMMARY OF THE INVENTION The present invention has been devised to achieve the above object, and has a large number of punched holes for punching holes in a plate-like material in cooperation with a large number of punched punches. A die, and the large number of punches arranged opposite to the die are detachably attached via respective punch guides,
An upper die adapter having an escape hole coaxially arranged with respect to each punch so as to allow the idle movement displacement of each punch in a direction away from the die, and a desired hole detachably mounted on the upper die adapter. A floating plate having a plug inserted into the relief hole corresponding to the punch of the hole to be punched in accordance with the opening pattern and prohibiting the punch from moving in a direction away from the die. The present invention proposes a punching die characterized by the following.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. (Note that members and portions that are substantially the same as or correspond to the conventional typical punching die shown in FIG. 3 and the proposed punching die shown in FIG. 4 are denoted by the same reference numerals, and overlapped. According to the present invention, the description is omitted.
A large number of punches 14 are detachably mounted on the lower surface of the upper die adapter 20 facing the die 12 via a punch guide 24 according to a desired hole arrangement pattern. The adapter 20 is coaxial with the punch 14,
Escape holes 36 each having a diameter sufficiently larger than the outer diameter of the punch head 14a are respectively formed. On the other hand, in the recess 38 provided on the upper side surface of the upper mold adapter 20, the floating plate 22
Is inserted and fixed to the upper adapter by an appropriate fixing tool such as a bolt.

The floating plate 22 has an escape hole 36 corresponding to the punch 14 in which a hole is to be punched according to a hole arrangement pattern of a specific vehicle type, and has an axial direction in which the punch 14 moves away from the die 12. Of the punch 14 is detachably attached by a bolt 42, and a relief hole 36 corresponding to another conventional discard hole is left as a hole that allows the idle movement of the punch 14 in a direction away from the die 12. . Floating plate 22
Usually, a plurality of holes are preferably prepared. While the floating plate 22 having a certain hole arrangement pattern is being attached to the upper die adapter 20 and the hole punching operation is being performed, the subsequent hole punching operation is performed. For this reason, it is desirable that a preparation operation for mounting the plug 40 be performed in accordance with each hole arrangement pattern. It should be noted that the structure of each member other than the floating plate 22 and the upper die adapter 20 is substantially the same as that of the conventional hole punching die and the already proposed hole punching die as apparent from the drawing.

FIG. 1 shows a state in which a plate-shaped material B is mounted at a predetermined position on the upper surface of the die 12 mounted on the lower die adapter 10, and then the upper die adapter 20 is lowered to move the guide plate 28 to the upper surface of the material B. Shows the moment of contact. When the upper die adapter 20 descends, the punch 14 descends while the elastic member 26 is compressed, as shown in FIG.
A hole is punched out of the material B by the punch 14 that abuts on the material B, and the punch 14 arranged coaxially with the escape hole 36 into which the plug 40 is not inserted moves in the escape hole 36, so that the hole is formed in the material B. Are not punched, and a large number of holes are punched in the material B according to the desired hole arrangement pattern.

According to the hole punching die according to the present invention, since the discarded holes can be removed from the side rails and the cross members of the series vehicles having different hole arrangement patterns, the strength of the chassis frame can be reduced due to the discarded holes and the parts can be reduced. There is an advantage that the erroneous assembly can be effectively prevented, and the user's vague anxiety or distrust can be eliminated. Further, when punching holes such as side rails having different hole arrangement patterns, the floating plate 22 that is sufficiently small and lightweight compared to the upper die adapter 20 may be replaced, so that there is an advantage that the work is easy. Further, since the punch 14 is mounted on the upper die adapter 20 by the punch guide 24, the diameter of the escape hole 36 is formed sufficiently larger than the outer diameter of the punch head 14a, so that the hole position which is frequently performed on a daily basis is reduced. There is an advantage that a slight change can be easily dealt with simply by shifting the position of the punch 14. As another embodiment of the present invention, a plug insertion hole corresponding to the escape hole 36 of the upper die adapter 20 is coaxially formed in the floating plate 22 so as to correspond to the hole arrangement pattern from the upper surface of the floating plate 22. By configuring the plug 40 to be inserted into the escape hole 36, the conversion of the floating plate 22 can be omitted. In this case, since the punching reaction force of the punch 14 is transmitted to the plug 40, whether the plug 40 is sufficiently firmly attached to the floating plate 22
Alternatively, it is necessary that the punching reaction force acting on the plug 40 be carried by the shank or ram on the press side. In addition, the hole punching die according to the present invention is not only for punching holes in the side rails and cross members of the truck chassis frame, but also for punching a large number of holes in a relatively thick plate-like material at the same time by punching. Can be widely applied.

[0015]

As described above, the punching die according to the present invention comprises a die having a large number of punching holes for punching holes in a plate material in cooperation with a large number of punching punches, The punches are arranged so as to be detachably mounted via punch guides, and are coaxially arranged with respect to the punches so as to allow the punches to move in the direction away from the die. An upper die adapter having a relief hole, and a detachably attached to the same adapter, and inserted into the relief hole corresponding to a punch of a hole to be punched according to a desired drilling pattern, from a die of the punch. A floating plate provided with a plug for prohibiting idling movement displacement in a direction away from the plate, wherein a plate-like material having a large number of holes arranged in various hole arrangement patterns is provided with discard holes. This Since no can be inexpensively processed, industrially it is very useful.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state immediately before punching of a punching die according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state after punching holes of the hole punching die shown in FIG. 1;

FIG. 3 is a cross-sectional view of a conventional hole punching die.

FIG. 4 is a cross-sectional view of a previously proposed die in which the hole punching die shown in FIG. 3 is improved.

[Explanation of symbols]

 10 Lower Adapter 12 Die 14 Punch 20 Upper Adapter 22 Floating Plate 24 Punch Guide 26 Elastic Member 28 Guide Plate 36 Escape Hole 40 Plug B Plate Material

Claims (1)

(57) [Claims] 1. A die having a large number of punched holes for punching holes in a plate-shaped material in cooperation with a large number of hole punching punches, and a punch guide arranged to face the die and a punch guide respectively. The upper and lower adapters have relief holes coaxially arranged with the punches so as to allow the punches to move in the direction away from the die while allowing the punches to move away from the die. Floating with a plug that is freely mounted and that is inserted into the relief hole corresponding to the punch of the hole to be punched according to the desired drilling pattern and prohibits the punch from moving in the direction away from the die. A hole punching die comprising a plate.