JP2002225124A - Method for trimming skin and mold for trimming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for trimming a skin which is improved in cutting performance when the skin, after being stuck to the surface of a core material by vacuum forming, is cut in a trimming shape and a mold for trimming which is used in the method. SOLUTION: A channel 36 for cutting is formed in a molding lower mold 30 corresponding to a vertically moving cutting blade 43, and an uneven part for adjusting skin tension which draws the skin 12 deeply is formed along the periphery of the channel 36 so that proper tension is applied to the skin 12 in the channel 36. An enough engagement of the cutting blade 43 is secured, and by eliminating the dislocation of the skin 12 during cutting by the cutting blade 43, trimming performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for trimming a skin of a vehicle interior part such as a door trim for a vehicle, a corner trim for a vehicle, and a molding die for trim cutting. The present invention relates to a method for trimming a skin and a molding die for trim cutting which can be performed easily and easily and can shorten a molding cycle.

[0002]

2. Description of the Related Art Normally, various interior parts such as door trims and rear corner trims are mounted on the interior side of a vehicle body panel. In many cases, the skin with a good feel is integrated, and as the process of integrating the core and the skin, an injection molding method and a mold are used in which the skin set in advance in the molding die is integrated with the molding of the core at the same time. A press forming method and a vacuum forming method in which a non-breathable skin is overlapped on a surface of a breathable core material and the air intervening between the two are vacuum-sucked to bond and fix the skin to the surface of the core material have been conventionally known. Have been.

A specific example of the latter will be described with reference to FIG.
First, a core material 2 previously formed into a required shape is formed in a lower mold 1.
The surface of the core material 2 is coated with an adhesive in advance. Then, the upper skin 3 is put in a state in which the peripheral edge is held by the clamp device 4.
Are preheated to a temperature at which they soften.

Further, a cutting blade 6 is attached to the upper die 5 located above, and the pattern of the cutting blade 6 is adapted to the trim cut shape of the skin 3, and from the outer peripheral edge of the core 1. The cutting lower mold 1 is provided with a cutting groove portion 7 corresponding to the cutting blade 6 so as to have a trim cut shape that allows for the winding white.

First, the outer surface of the core material 2 is sealed by the skin 3 by raising the lower molding die 1 on which the core material 2 is set or by lowering the clamp frame 4 holding the skin 3. By operating the vacuum suction mechanism 8 provided in the lower molding die 1, the skin 3 is vacuum-adhered to the surface of the core material 2.

Then, after cooling the surface of the skin 3 by air cooling with a fan or water spray, the upper die 5 is lowered by a predetermined stroke so that the cutting blade 6 enters the cutting groove 7 of the lower molding die 1. Thereby, the skin 3 is trimmed along a predetermined trim cut shape.

In this case, the thickness of the cutting blade 6 is 1 to 3
mm, the groove width of the cutting groove portion 7 is adjusted by a width larger by 1 to 5 mm than the thickness of the cutting blade 6, and the bite amount of the cutting blade 6 is set to 10 to 20 mm.

[0008]

However, in the conventional trim cutting method for the skin 3, as shown in FIG. 12, when the skin 3 is deeply sucked into the cutting groove 7 by vacuum forming, the cutting blade 6 is cut. Has been pointed out as a disadvantage that the bite of the cutting becomes insufficient, cutting defects frequently occur, and the cutting performance deteriorates.

Furthermore, when the cut amount is set to a large stroke amount to enhance the cut workability, the size of the winding surface of the skin 3 is increased, so that the winding operation becomes difficult, and the winding work becomes difficult. There is a problem that the workability in the terminal processing work is reduced, for example, interference easily occurs.

In addition, a prolonged cooling cycle for cooling the skin 3 by an air cooling method, a water cooling method, or the like has also been an obstacle in improving productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a trim cut method for a skin to be adhered to a core material surface by vacuum forming, and a trim cut mold structure used therefor. An extremely practical method of trimming and trimming the skin, in which a reliable cutting performance can be obtained without having to set a large vertical stroke of the skin, and the wraparound of the skin can be set small and the cooling cycle of the skin can be shortened. The purpose of the present invention is to provide a molding die.

[0012]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present application is to trim the outer peripheral end of the skin after attaching the skin to the surface of the core material by vacuum forming. A trim cut method for the skin to be treated, in which the skin is shaped irregularly along the outer periphery of the trim cut part of the skin, thereby imparting appropriate tension to the cut part of the skin and controlling the slippage of the skin. It is characterized by performing trim cut processing of the epidermis while performing.

[0013] The trim-cutting mold used in the above method is a trim-cutting mold for trimming an outer peripheral end of the skin after adhering the skin to the core material surface by vacuum forming. A lower mold having a vacuum suction mechanism for setting a core material molded into a required shape, and an upper mold having a cutting blade which can be moved up and down a predetermined stroke and is arranged along a trim cut line of a skin. The lower mold is provided with a cut groove corresponding to the cutting blade, and a concave / convex portion for adjusting the skin tension is provided for drawing and forming the skin along the outer circumference of the cut groove. It is characterized by having been done.

Here, the concave / convex portion for adjusting the skin tension may be a concave or convex portion having a rectangular cross section, a curved concave portion or a convex portion such as a semicircular cross section, or a concave or convex portion having a semicircular shape. The formation of the portion is preferable from the viewpoint of mold processing.

In addition, if a vacuum suction hole is provided in the concave portion for adjusting the skin tension among the concave and convex portions for adjusting the skin tension, the skin can be surely formed into a concave shape, and the shape retention and holding force of the skin can be improved. Can be strengthened.

According to the present invention, since the skin is drawn along the skin tension adjusting irregularities provided on the outer periphery of the cutting groove of the lower molding die, it is suitable for the skin located in the cutting groove. As a result, a sufficient amount of bite of the cutting blade is secured, and a reliable trim cutting process can be performed.

Furthermore, since the trim cut processing of the skin can be performed with a small descending stroke amount, no extra winding is generated, and the terminal processing of the skin can be easily performed.

Further, since the trim cut of the skin can be easily performed, the cooling time of the skin before the cut blade is processed can be shortened, and the total molding cycle time can be shortened.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a trim cut method for a skin and a mold for trim cut according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing the structure of a door trim for an automobile manufactured by applying the method of the present invention, and FIG. 2 is a schematic view showing the structure of a trim cutting mold used in carrying out the method of the present invention. FIGS. 3 to 8 are explanatory views showing each step of the method for trimming the epidermis according to the present invention, and FIGS.
FIG. 1 is a configuration explanatory view showing an embodiment of a trim cutting molding die according to the present invention.

First, the object to which the method of the present invention is applied is not particularly limited as long as it is a structure in which a skin is adhered to the surface of a core material by vacuum forming. Door trim, rear corner trim, Rear parcel shelf,
Widely applied such as luggage trim.

FIG. 1 shows a cross-sectional structure of a door trim for an automobile. A skin 12 is adhered to the surface of a core material 11 formed in a required shape via an adhesive. Is wound around the back side of the core material 11.

In the present invention, since the skin 12 is adhered by vacuum forming, the core material 11 may have air permeability or a vacuum hole may be opened even if it is a non-air permeable material. In this embodiment,
A wood-based core material having air permeability is used.

The outer skin 12 is made of a non-breathable synthetic resin sheet or a non-breathable synthetic resin sheet with a cushion layer on the back surface. In this embodiment, a laminated sheet material in which a polyethylene foam is lined on the back surface of a TPO (thermoplastic olefin) sheet is used.

Next, a trim-cutting mold 20 for vacuum-adhering the skin 12 to the surface of the core material 11 and trim-cutting the trim of the skin 12 in view of the winding white 13 will be described with reference to FIG. To explain, the trim cutting molding die 20 is a lower molding die 3 having a vacuum suction mechanism.
0 and an upper mold 40 which is located above the lower mold 30 and has a cutting function capable of moving up and down by a predetermined stroke.

More specifically, the lower mold 30 has a plurality of vacuum suction holes 31 formed in the mold surface, and a vacuum suction pipe 33 communicating with the internal air chamber 32 is connected to a vacuum pump 34. An opening / closing valve 35 is provided.

The upper die 40 is provided with a lifting cylinder 41.
An elevating plate 42 is mounted on the lower surface of the elevating plate 42. On the lower surface of the elevating plate 42, a cutting blade 43 corresponding to the trim cut shape of the skin 12 is provided. In addition, a cutting groove 36 is provided in the lower molding die 30 so as to correspond to the trim cut blade 43, and a skin tension adjusting groove 37 is provided along the outer periphery in a rectangular cross section. .

Next, this trim cutting molding die 20
An embodiment applied to the method of manufacturing the door trim 10 will be described with reference to FIGS.

First, as shown in FIG.
2 is located above, and when the trim cutting mold 20 is in the mold open state, the preformed core 11 is set on the mold surface of the lower mold 30 and the preheated outer skin 12 periphery. Is held in the mold while being held by the clamp frame 50. The surface of the core material 11 is coated with an adhesive in advance.

Thereafter, as shown in FIG.
Is moved up or the clamp frame 50 is moved down, so that the skin 1
2 and a vacuum suction mechanism attached to the lower molding die 30 is operated to vacuum adhere the skin 12 to the surface of the core material 11.

At this time, the air interposed between the core material 11 and the skin 12 is exhausted to the outside through the vacuum suction holes 31 provided in the lower mold 30 and the core material 11 and the skin 1.
2, the skin 12 can be satisfactorily adhered to the surface of the core material 11 without air accumulation, and the skin located outside the outer peripheral edge 11a of the core material 11 as shown in FIG. Reference numeral 12 denotes a relationship in which a cut groove 36 and a skin tension adjusting groove 37 formed on the mold surface of the lower mold 30 are formed. The skin 12 includes a groove depth and a groove width of the skin tension adjusting groove 37. Is held in the lower molding die 30, so that in the cutting groove 36,
An appropriate tension is applied to the skin 12.

Then, as shown in FIG. 6, the elevating cylinder 41 is operated, and the elevating plate 42 and the cutting blade 43 are operated.
7, the cutting blade 43 moves the cutting groove 3 of the lower forming die 30 as shown in FIG.
6, the skin 12 is cut along a desired trim cut shape.

At this time, the skin tension adjusting groove 37 is formed.
Since the skin 12 is formed and held therein, when the cutting blade 43 bites into the skin 12, a sufficient amount of bite is secured,
Cutting of the epidermis 12 can be easily performed.

Further, as a synergistic effect, since the skin 12 is formed and fixed in the shape of the skin tension adjusting groove 37, when the cutting blade 43 descends into the cutting groove 36, the skin 12 is prevented from slipping. Therefore, the cutting can be performed more reliably.

Before the cutting blade 43 descends, the skin 1
2 is cooled by air-cooled air and water spray, etc., but even if there is some residual heat, reliable trim cutting can be performed, so that the cooling time can be shortened and the molding cycle can be shortened. .

Next, when the trim cutting by the cutting blade 43 is completed, the operation of the elevating cylinder 41 causes
After the cutting blade 43 and the elevating plate 42 are raised, a semi-finished product obtained by integrating the skin 12 on the surface of the core material 11 is taken out from the lower molding die 30, and as shown in FIG. Although it is sufficient to perform the winding process on the back side of the material 11, as described above, according to the method of the present invention, a reliable cutting process can be performed with a small descending stroke of the cutting blade 43, so that a large amount of winding white does not occur. In addition, the terminal processing operation of the wrapping white 13 can be simplified.

Next, FIGS. 9 and 10 show another embodiment of the molding die 20 for carrying out the method of the present invention.
FIG. 9A shows another embodiment of the skin tension adjusting groove 37 provided on the outer periphery of the cutting groove 36 of the molding die 20.
As shown in FIG. 9, a concave portion 37a having a semicircular cross section is provided along the outer periphery of the cutting groove 36, or as shown in FIG. 9B, a semicircular concave portion 37a is formed along the outer periphery of the cutting groove 36. The projection 37b is provided.

When the concave portion 37a or the convex portion 37b having a semicircular cross section is provided as described above, the skin 1
At the time of vacuum forming of 2, the semicircular narrowed portion is formed along the outer periphery of the trim cut portion of the skin 12, so that an appropriate tension is applied to the trim cut portion and the bite of the cutting blade 43 is sufficiently secured. As in the above-described embodiment, it is possible to improve the cutting performance and to prevent the skin 12 from slipping, thereby obtaining a simple and reliable cutting performance, as shown in FIG. When the semicircular concave and convex portions 37a and 37b are set,
There is an advantage that die machining can be simplified.

Further, as shown in FIG. 10, a skin tension adjusting groove 37 is provided in a rectangular shape along the outer periphery of the cutting groove 36, and when the vacuum suction hole 31a is provided in the groove 37, the skin 12 During vacuum forming, since the shape retention of the groove shape and the holding force of the skin 12 can be further enhanced,
Even if the groove depth and the groove width of the skin tension adjusting groove 37 are set to be small, it is possible to secure a sufficient bite amount of the cutting blade 43 and to control the displacement of the skin 12. Note that, instead of the rectangular groove portion 37, a semicircular concave portion provided with the vacuum suction hole 31a may be employed.

[0040]

As described above, according to the method for trimming the skin according to the present invention and the molding die for trim cutting used in the method, after the skin is vacuum-adhered to the surface of the core material by vacuum forming, the upper mold is cut. When the cut blade provided in the lower mold is cut into the cut groove provided in the lower mold, and the outer skin is trimmed, irregularities for adjusting the skin tension are provided along the outer circumference of the cut groove in the lower mold. Because, during vacuum forming of the skin, the skin is formed and held along the outer circumference of the trim cut line, and when cutting with the cutting blade, a sufficient amount of cutting of the cut blade can be secured, and the displacement of the skin can be regulated, This has the effect of significantly improving the trim cut performance of the skin.

Further, by improving the cutting performance of the skin located in the cutting groove of the lower mold, reliable cutting can be performed even when the stroke of the cutting blade is set small. The vacuum molding process can be performed easily, and the trimming process can be performed reliably even if residual heat remains in the cooling process after vacuum forming. This has the effect that the cycle can be shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an automobile door trim manufactured by applying the method of the present invention.

FIG. 2 is a schematic view showing the entire configuration of a molding die for trimming a skin according to the present invention.

FIG. 3 is an explanatory view showing a material setting step in the skin trim cutting method according to the present invention.

FIG. 4 is an explanatory view showing a vacuum forming step of the skin in the skin trim cutting method according to the present invention.

FIG. 5 is an explanatory view showing a state of a trim cut portion and an outer peripheral portion thereof in a vacuum forming step of the skin shown in FIG. 4;

FIG. 6 is an explanatory view showing a skin cutting step in the skin trim cutting method according to the present invention.

FIG. 7 is an explanatory view showing a state of a trim cut portion and an outer peripheral portion thereof in a skin cutting step shown in FIG. 6;

FIG. 8 is an explanatory view showing a terminal processing step after trim cut processing of the skin according to the present invention.

FIG. 9 is an explanatory view showing another embodiment of a trim cutting molding die according to the present invention.

FIG. 10 is an explanatory view showing another embodiment of a trim cutting molding die according to the present invention.

FIG. 11 is an explanatory view showing a conventional trim cutting molding die.

FIG. 12 is an explanatory view showing a trim cutting step using a conventional trim cutting molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Door trim for automobiles 11 Core material 12 Skin 13 Rolling-in white 20 Mold for trim cut 30 Mold lower mold 31, 31a Vacuum suction hole 32 Internal air chamber 33 Vacuum suction pipe 34 Vacuum pump 35 Open / close valve 36 Cut groove 37 Skin Tension adjusting groove 37a Semicircular concave portion 37b Semicircular convex portion 40 Upper die 41 Elevating cylinder 42 Elevating plate 43 Cutting blade 50 Clamp frame

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29C 51/06 B29C 51/06 // B29L 31:30 B29L 31:30 F-term (Reference) 3C027 JJ04 JJ08 3C060 AA20 BA03 BG08 BH01 4F202 AD08 AD17 AD20 AH23 CA17 CB01 CB12 CK84 CQ06 4F208 AD08 AD17 AD20 AH23 MA01 MB01 MB11 MC02 MG05 MH06 MW23

Claims (5)

[Claims] 1. A trim cut method for a skin, comprising: attaching a skin (12) to the surface of a core material (11) by vacuum forming; and trimming an outer peripheral end of the skin (12). Along the outer circumference of the trim cut part of the skin (1
By shaping 2) into an uneven shape, it is possible to impart an appropriate tension to the cut portion of the skin (12) and perform trim cut processing of the skin (12) while restricting slippage of the skin (12). Characteristic trim cut method of epidermis. 2. A molding die (2) for trimming an outer skin, wherein a skin (12) is adhered to a surface of a core material (11) by vacuum forming, and then an outer peripheral end of the skin (12) is trimmed.
0), and a lower mold (30) having a vacuum suction mechanism for setting a core material (11) formed in a required shape, and a trim cut line of a skin (12) which can move up and down by a predetermined stroke. And an upper die (40) having a cutting blade (43) disposed along the lower die (3).
0), a cutting groove portion (36) corresponding to the cutting blade (43) is formed in a concave shape, and the cutting groove portion (36) is formed.
A skin tension adjusting concave / convex portion for forming the skin (12) by drawing along the outer periphery of the skin (12). 3. The molding die for trimming a skin according to claim 2, wherein the skin tension adjusting concavo-convex portion is a skin tension adjusting groove (37) having a rectangular cross section. 4. The molding die for trimming a skin according to claim 2, wherein the uneven portion for adjusting the skin tension is set in a curved shape. 5. The molding die for trimming a skin according to claim 2, wherein the skin tension adjusting uneven portion is a concave portion, and a vacuum suction hole (31a) is set in the concave portion. .