JP2001353694A - Pierce-cutting method and apparatus for soft molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure removal of end material by enhancing the cutting property of a pierce-cutting method and apparatus for pierce-cutting an opening in a predetermined portion of a soft molding such as an insulator dashboard. SOLUTION: The press drag 20 of the pierce-cutting apparatus 10 includes a drag pad 22 vertically movable via a buffer spring 23, and a cutting blade 24 provided on the drag pad 22 while avoiding interference therewith. A press cope 30 is provided with receiving rubber 32 corresponding to the cutting blade 24. Also, a pressure plate 33 driven by an air cylinder 32 as a tensioning mechanism imposing a tearing force on a pierce-cut portion or a pressure plate 33 energized downwards by a coil spring 35 is used to apply tension in tearing direction to the pierce-cut portion during cutting operation so as to increase the cutting property of the apparatus. The operation of the pressure plate 33 is continued to ensure collection of the end material (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piercing method and a piercing device for a soft formed body for piercing an opening at a desired position of a soft formed body such as an insulator dash for an automobile, and more particularly to improving cutting performance. Accordingly, the present invention relates to a piercing cut method and a piercing device for a soft formed body capable of improving productivity.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, a dash panel 1 for partitioning an engine room E and a passenger compartment R of a passenger car or the like.
An insulator dash 2 having soundproofing properties is mounted on the indoor side of the vehicle.
Is composed of a laminate of a sound insulating material layer 2a having a relatively high areal density and a sound absorbing material layer 2b based on a porous sound absorbing material.

[0003] The desired sound absorbing effect of the sound absorbing material layer 2b reduces the level of noise transmitted through the dash panel 1 into the cabin R, while the double-wall sound insulating between the dash panel 1 and the sound insulating material layer 2a. The function makes it possible to exhibit excellent soundproofing properties in addition to the above sound absorbing effect.

[0004] By the way, the insulator dash 2
Is composed of a soft molded body having elasticity so as to fit into the interior surface of the dash panel 1, and as shown in FIG. 7, wiring harnesses and pipes connected to an air conditioning unit and electric components in the vehicle interior. A plurality of openings 3 for penetrating through are provided.

[0005] Conventionally, the insulator dash 2
As a method for opening the opening 3 in the pier, a piercing device 4 shown in FIG. 8 is used.

The piercing cut device 4 is a press upper and lower die (press lower die 5, press upper die 6) capable of clamping and opening the die.
In the press lower die 5, a lower die pad 5b is mounted on a lower plate 5a via a buffer spring 5c so as to be vertically movable, and a cutting blade 7 is mounted on a pierce cut portion via a bracket 7a. Lower table 5
a.

On the other hand, in the upper press die 6, a receiving rubber 6a is embedded corresponding to the cutting blade 7 so that the cutting edge of the cutting 7 bites.

Next, an opening 3 is formed in the insulator dash 2.
First, as a piercing method to cut piercing,
After placing the product surface of the insulator dash 2 on the lower side and placing it on the lower die pad 5b, the press upper die 6 is lowered by operating a lifting cylinder (not shown). Then, the lower mold pad 5b is contracted by the press pressure from the upper press mold 6, and descends by contracting the buffer spring 5b.
Since the cutting blade 7 has a fixed structure, the cutting blade 7 rises relatively to the lower die pad 5b, and the cutting blade 7 penetrates through the insulator dash 2 and is in the receiving rubber 6a of the upper press die 6. As a result, piercing is performed as shown in FIG.

[0009]

As described above, the insulator dash 2 is formed by using the conventional piercing and cutting device 4.
In the method of piercing and cutting the opening 3, the opening of the lower die pad 5 a is about 10 mm with respect to the piercing diameter of the cutting blade 7 so that the lower die pad 5 a does not interfere with the cutting blade 7. Because the diameter is set to be large, a sufficient amount of clamping (indicated by d in FIG. 10) for clamping the insulator dash 2 cannot be ensured, and the insulator dash 2 cannot be reliably clamped at the pierce cut portion. In addition, many cutting defects occurred, which was a major factor in lowering workability.

The present invention has been made in view of such circumstances, and when piercing and cutting an opening in a soft molded body such as an insulator dash, it is possible to eliminate a cutting defect and greatly increase productivity. It is an object of the present invention to provide a piercing method and a piercing device for a soft molded product.

[0011]

Means for Solving the Problems To achieve the above object, the present invention provides a method of placing a soft compact on a lower pad of a lower die of a press, and lowering the upper die of the press by lowering the lower die of the press. In the piercing cut method of the soft molded body, in which the cutting edge of the cutting blade of the mold bites into the receiving rubber of the upper press die to pierce an opening at a predetermined position of the soft molded body, the cutting blade is used when the upper and lower press dies are clamped. Immediately before the cutting process, the pressing plate of the tension applying mechanism provided on the press upper die is pressed against the opening portion of the soft molded body to apply tension downward, and the cutting force of the cutting blade and the tearing by the pressing plate are applied. The piercing cut processing is performed by force.

Further, the piercing and cutting apparatus used in the method of the present invention is a piercing and cutting apparatus for a soft formed body which opens an opening at a predetermined position of the soft formed body. The press lower mold has a lower mold pad mounted on the lower plate via a shock-absorbing spring so that it can move up and down. It is arranged toward the, the opening of a larger diameter than the piercing opening of the cutting blade is opened in the lower die pad, while the press upper die is buried with receiving rubber corresponding to the cutting edge of the cutting blade, In addition, a tension applying mechanism is provided at the pierced cut portion, and the tension applying mechanism has an area corresponding to the pierced cut area, pushes the pierced cut portion downward, and pulls it. A pressing plate imparting can force, characterized by comprising the drive means of the pressing plate.

Here, as a driving means for pushing down the pressing plate, the pressing plate may be moved up and down by a predetermined stroke by an air cylinder, or a biasing spring may be wound around the outer periphery of a shaft supporting the pressing plate. And the pressing plate may be urged downward by the spring force of the spring.

As is apparent from the above configuration, according to the method of the present invention, when the upper and lower dies of the press are clamped, the opening portion of the soft formed body immediately before the cutting blade provided in the lower die cuts into the soft formed body. Can be applied in the cutting blade direction by a tension applying mechanism. Therefore, the cutting performance is improved because the push-off force when the cutting blade bites into the receiving rubber and the tearing force for tearing the pierce cut portion of the soft molded body act.

Furthermore, after the piercing cut processing, when the upper die of the press is lifted, if the tensioned state is maintained by the tension applying mechanism, the end material can be reliably removed.

Next, according to the piercing device according to the present invention, since the opening of the lower die pad is formed to be larger than the piercing diameter of the cutting blade, the cut blade and the lower die pad interfere with each other in the piercing cutting step. In addition to ensuring a smooth cutting process without the need to use a press plate that moves up and down with an air cylinder as a mechanism to apply tension to the pierced cut portion of the soft molded product, the stroke length of the air cylinder can be adjusted appropriately By setting to
Appropriate tension can be imparted to the soft molded body.

[0017] Further, in the configuration in which the pressing plate is tensioned in the cutting direction by the spring force of the urging spring, the mold equipment can be simplified.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a piercing method and an apparatus for piercing a soft molded article according to the present invention will be described in detail with reference to the accompanying drawings.

As the soft molded body, as in the conventional example,
The present invention is applied to an insulator dash 2 made of a laminated molded body of a sound insulating material layer 2a and a sound absorbing material layer 2b, and a method of piercing and cutting an opening 3 for passing a wiring harness, piping, etc. through the insulator dash 2, and a piercing cut device. Will be described below.

FIG. 1 shows a piercing device 10 according to the present invention.
1 shows a first embodiment of the present invention.
Reference numeral 0 denotes a press lower mold 20 and a press upper mold 30 which can move up and down by a predetermined stroke. The specific structure of the press lower mold 20 is as follows. Is attached via a buffer spring 23, and the lower mold pad 22 is lowered by a predetermined stroke by the press pressure applied from the press upper mold 20, and is movable up and down so as to return to the base position when the press pressure is released. Has become.

A cutting blade 24 is attached to the lower plate 21 for each piercing cut portion via a bracket 25 so that the cutting edge of the cutting blade 24 has a loop shape that matches the outer shape of the opening 3. The lower plate 21 is provided with an opening 26 so that the end material punched out by the cutting blade 24 can be removed out of the mold.

In order to avoid interference between the cutting blade 24 and the lower die pad 22, the opening of the lower die pad 22 (reference numeral d2 in the drawing) is set with respect to the piercing diameter (indicated by d1 in the drawing) of the cutting blade 24. ) Is set to have a large diameter of about 10 mm, so that interference between the cutting blade 24 and the lower mold pad 22 is avoided.

On the other hand, the press upper die 30 can be moved up and down by a predetermined stroke by an elevating cylinder (not shown).
The press upper die 30 is clamped to the press lower die 20, and a receiving rubber 31 into which the cutting edge of the cutting blade 24 bites is buried and fixed to the die surface of the press upper die 30 corresponding to the cutting blade 24. In addition, an air cylinder 32 is disposed as a tension applying mechanism for each portion where the cutting blade 24 is provided, and a pressure having a diameter slightly smaller than the piercing diameter of the cutting blade 24 is applied to the tip of the piston rod 32 a of the air cylinder 32. A plate 33 is attached.
Is housed in the recess 30a of the upper press die 30 when the air cylinder 32 contracts.

When the opening 3 is formed on the insulator dash 2 by the piercing cutting process, the tension applying mechanism including the pressing plate 33 operated by the air cylinder 32 applies a tension toward the cutting dash 24 to the insulator dash 2. In addition, it has a function of ensuring good cutability.

The piercing device 10 according to the present invention is configured as described above. Hereinafter, each step of the piercing method for the insulator dash 2 will be described.

First, as shown in FIG. 2, the sound insulating material layer 2a of the insulator dash 2 faces downward, and
The insulator dash 2 is set on the lower mold pad 22 of No. 0. At this time, since the buffer spring 23 in the press lower die 20 is in an extended state, the cutting edge of the cutting blade 24 is located below the lower die pad 22.

After the insulator dash 2 is set at an appropriate position, the elevating cylinder of the press upper die 30 operates to lower the press upper die 30 by a predetermined stroke, and as shown in FIG. The mold surface pushes the insulator dash 2 downward, and is fixed to the lower plate 21 as the lower mold pad 22 descends due to the cushioning action (shrinkage action) of the cushioning spring 23 in the press lower mold 20. The cutting blade 24 is the lower mold pad 22
, The cutting edge of the cutting blade 24 penetrates through the insulator dash 2 and bites into the receiving rubber 32 of the upper press die 30.

At this time, the air cylinder 32 operates just before the cutting blade 24 touches the surface of the sound insulating material layer 2 a of the insulator dash 2.
The pressing plate 33 attached to the tip of the piston rod 32a is used to cut the cutting blade 24 of the insulator dash 2.
Is pressed downward as indicated by an arrow in the figure.

That is, the tension is applied in the cutting direction over the entire portion of the insulator dash 2 where the opening 3 is to be formed.
The tension (acting as a tearing force) from the pressing plate 33 can be applied, so that a cutting defect does not occur, a reliable cutting process is performed, and the piercing of the opening 3 along the peripheral shape of the cutting blade 24 is performed smoothly. It is performed.

Then, after the piercing cut processing is performed, the upper press die 30 is raised by the operation of the lifting cylinder. At this time, as shown in FIG. If the cutting blade 24 is pushed down by the action of
Scrap a does not remain on the insulator dash 2,
The offcuts a can be completely removed. In addition, this end material a
Is not always necessary and may be omitted.

As described above, the air cylinder 32 and the pressing plate 3
3, the cutting blade 24
At the time of cutting by, over the entire pierce cut site,
By pushing in the cutting direction and applying a tearing force to the cut part, the cutting efficiency can be increased,
Further, if desired, after the cutting process, if the press plate 33 is further operated by the air cylinder 32 to assist the work of removing the scraps a, there is an advantage that the work of collecting the scraps a can be performed smoothly.

Next, FIG. 5 shows a second embodiment of the piercing device 10 according to the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted.

In the second embodiment, as a tension applying mechanism, the pressing plate 33 is supported by a support shaft 34, and a coil spring 35 is wound around the outer periphery of the support shaft 34.

Accordingly, the pressing plate 33 is always urged downward by the urging force of the coil spring 35,
At the time of cutting with the cutting blade 24, the pressing plate 33 is pressed down by the spring pressure of the coil spring 35 to apply tension in the tear direction to the pierce cut portion (the planned portion of the opening 3) of the insulator dash 2. .

According to the second embodiment, an appropriate tension can be applied to the pierce cut portion of the insulator dash 2 and a good cut process can be performed. In particular, by using the coil spring 35, the air cylinder The cost can be reduced as compared with the structure using 32.

Each of the embodiments described above is applied to the method of piercing the opening 3 at a predetermined position of the insulator dash 2. However, the processing object is not particularly limited as long as it is a soft molded body.

[0037]

As described above, according to the piercing method and the piercing device for a soft molded product according to the present invention, when a predetermined opening is opened in the soft molded product by the pressing action of the cutting blade, the piercing cut is performed. By imparting the tension in the tearing direction to the portion, the pierce-cut portion has an effect that the piercing-cutting force and the tearing force act to perform a good piercing-cutting process, thereby improving the cutting workability.

Furthermore, after the piercing cut processing, the tension is applied in the direction of removing the scraps by the tension applying mechanism, whereby the scraps can be reliably removed, and the workability of collecting the scraps is improved. This has the effect that a smooth processing cycle can be ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a configuration of a first embodiment of a piercing device for a soft molded product according to the present invention.

FIG. 2 is an explanatory view showing a setting step of a soft molded body in the method of the present invention.

FIG. 3 is an explanatory view showing a piercing cut processing step of a soft molded article in the method of the present invention.

FIG. 4 is an explanatory view showing a step of removing the offcuts after piercing in the method of the present invention.

FIG. 5 is a cross-sectional view of a principal part showing a second embodiment of the piercing and cutting apparatus for a soft molded product according to the present invention.

FIG. 6 is an explanatory view showing an installation location of an insulator dash.

FIG. 7 is a front view of the insulator dash.

FIG. 8 is an explanatory diagram showing a configuration of a conventional piercing device.

FIG. 9 is an explanatory diagram illustrating a piercing step using a conventional piercing device.

FIG. 10 is an explanatory view showing a clamp portion in a conventional piercing cut step.

[Explanation of symbols]

 2 Insulator dash (soft molded body) 3 Opening 10 Pierce cutting device 20 Press lower die 21 Lower plate 22 Lower die pad 23 Buffer spring 24 Cut blade 25 Bracket 26 Opening 30 Press upper die 31 Receiving rubber 32 Air cylinder 32a Piston rod 33 Press plate 34 Support shaft 35 Coil spring a End material

Claims (5)

[Claims] A lower pad (2) for a press lower die (20).
2) After placing the soft compact (2) on the upper press die (30), the cutting edge of the cutting blade (24) of the press lower die (20) is adjusted to the cutting edge of the press upper die (30). Receiving rubber (3
In a piercing cut method of a soft molded body, wherein an opening (3) is pierced at a predetermined position of the soft molded body (2) by cutting into the soft molded body (1), a cutting blade is used when the upper and lower press dies (20, 30) are clamped. (2
Immediately before the cutting process according to 4), the pressing plate (33) of the tension applying mechanism provided on the upper press die (30) is pressed against the opening (3) of the soft molded body (2) at a predetermined site to apply tension downward. And the pressing force by the cutting blade (24),
A piercing cut method for a soft molded product, wherein a piercing cut is performed by a tear force of a pressing plate (33). 2. After the piercing cut by the cutting blade (24), when the upper press die (30) is lifted, tension is applied in the direction of removing the scrap (a) from the pressing plate (33). A method for piercing a soft molded article according to claim 1. 3. A piercing cut device (1) for a soft molded body, which has an opening (3) at a predetermined position of the soft molded body (2).
0), comprising a press upper and lower mold (20, 30) capable of clamping and opening the mold, and a press lower mold (20).
Has a lower pad (22) mounted on a lower plate (21) via a cushioning spring (23) so as to be vertically movable, and a cutting blade is provided on the lower plate (21) in accordance with a piercing cut portion. (24) is disposed with its cutting edge facing upward, and an opening having a diameter larger than the piercing opening of the cutting blade (24) is opened in the lower die pad (22), while the press upper die (30) is A receiving rubber (31) is embedded corresponding to the cutting edge of the cutting blade (24), and a tension applying mechanism is provided at a piercing cut portion;
The tension applying mechanism has an area corresponding to the piercing cut area, and pushes the piercing cut portion downward to apply a tearing force, and a pressing plate (33).
A piercing cut device for a soft molded body, comprising the driving means of 3). 4. An apparatus according to claim 3, wherein the driving means of the pressing plate (33) is an air cylinder (32). 5. An apparatus according to claim 3, wherein the driving means of the pressing plate is a biasing spring.