JPH0678037U - Core material for automobile door trim and its manufacturing device - Google Patents

Abstract

(57) [Summary] [Object] To provide a core material for a vehicle door trim capable of sufficiently absorbing energy at the time of a side collision of a vehicle without using a cushioning material, a shock absorbing pad, and the like, and a manufacturing apparatus therefor. [Structure] In a core material 1 of an automobile door trim, a weld line 3 is formed in a range 5 where an occupant collides in a side collision by adjusting a position of a gate 2 and an amount of injected resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a core material for an automobile door trim that absorbs energy when a resin core material is broken from a weld line in a side collision and a manufacturing apparatus for the core material.

[0002]

[Prior art]

 When a core material for a conventional automobile door trim is produced by injection molding, as shown in FIG. 5, the gate 2 considers the flow of resin so that the weld line 3 is dispersed throughout the core material 1 of the automobile door trim. Well set. Reference numeral 4 indicates an armrest, and 5 indicates a range in which an occupant collides during a side collision.

As a conventional one that absorbs energy on the side of a vehicle body, there is one in which a cushioning material such as urethane foam is provided on the surface of a core material of an automobile door trim. Further, FIG. 6 shows an energy absorbing structure of a vehicle body side portion disclosed in Japanese Utility Model Laid-Open No. 3-49111, 6 is a driver's seat, and a side door 7 can be opened and closed with respect to a vehicle body 8 on the outside thereof. It is installed in. The inner side of the side door 7 is composed of a chest impact absorbing pad portion 9A corresponding to the chest of the occupant sitting on the driver's seat 6 and a waist impact absorbing pad portion 9B corresponding to the occupant's waist. A shock absorbing pad 9 is provided as a shock absorbing member that absorbs shock energy in a side collision. The shock absorbing pad 9 is made of an energy absorbing pad material such as polyurethane foam.

[0004]

[Problems to be solved by the device]

 However, in the case of providing the above-mentioned conventional cushioning material, it is necessary to provide a separate cushioning material, and in the case of providing the above-mentioned conventional shock absorbing pad, the provision thereof saves space, There was also the problem that it would be necessary to manufacture a separate shock absorbing pad. The present invention has been made in order to solve the above problems, and is a core material for an automobile door trim that can sufficiently absorb energy at the time of a side collision of an automobile without using a cushioning material, a shock absorbing pad, or the like. And its manufacturing equipment.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the vehicle door trim core material of the present invention has a plurality of weld lines set in a range where an occupant collides with the vehicle door trim rear side collision. The core material manufacturing apparatus for an automobile door trim according to the present invention includes a fixed-side template having a mold surface corresponding to one outer shape of the core material for an automobile door trim, and a mold surface corresponding to the fixed-side template. A side collision in an injection molding machine including a movable side template having a plurality of gates, a runner connected to a plurality of gates, and an injection nozzle that supplies resin as a core material of an automobile door trim to the gates through the runners. At least three or more gates are provided on the mold surface of the template corresponding to the area where the occupants sometimes collide or in the vicinity.

[0006]

[Action]

 Since the automobile door trim core material and the manufacturing apparatus therefor according to the present invention are configured as described above, a weld line is generated in a range where an occupant collides in a side collision, and the resin core material is removed from the weld line in a side collision. It can crack and absorb energy.

[0007]

【Example】

 An embodiment of a core material for an automobile door trim and a manufacturing apparatus therefor according to the present invention will be described below with reference to the drawings. The same elements as those shown in the prior art of FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 shows an embodiment of a core material for an automobile door trim according to the present invention. Reference numeral 3 is a weld line. Here, the weld line is a thin line generated at the meeting part of the molding material flowing in the cavity (cavity forming the shape of the molded product), which is a boundary line formed because the meeting parts do not completely melt. Say that.

In the present embodiment, the position where the weld line 3 is generated is set in the vicinity of the range 5 where the occupant collides during a side collision by adjusting the position of the gate 2 and the amount of resin injected from each gate 2, and this portion. The strength of the core material 1 of the automobile door trim is reduced so that the core material 1 of the automobile door trim is broken from this portion and absorbs energy when the side collision of the automobile occurs.

FIG. 2 shows an outline of an injection molding machine for manufacturing the core material 1 of a door trim for an automobile. The injection molding machine includes a movable mold plate 10 and a fixed mold plate 11 which form a set of molding dies. The movable side mold plate 10 has a mold surface 12 corresponding to one outer shape of the core material 1 of the automobile door trim, and a plurality of gates 2 connected to the runner 13 are opened at a predetermined portion of the mold surface 12 ( In this embodiment, there are 6 and 3 more in the direction perpendicular to the paper surface.). In this case, each gate 2 faces a gate pin 14 which constitutes a gate opening / closing means. Further, an injection nozzle 15 for supplying a resin such as PP or ABS, which is a core material, to the gate 2 through the runner 13 is detachably attached to the end of the runner 13. On the other hand, the fixed-side mold plate 11 has a mold surface 16 facing the movable-side mold plate 10 and supported by a backup body.

FIG. 3 shows a gate opening / closing means having the gate pin 14 as a constituent element. The movable mold plate 10 has a mold surface 12 and includes a mold member 18 defining a cooling passage 17, a runner member 19 defining a runner 13, and a support member 20. A nozzle member 22 is attached to the mold member 18 via a support ring 21, and a sleeve 23 is fitted to the nozzle member 22. A seat 24 is attached to the lower end portion of the sleeve 23, and the hollow portion 25 of the sleeve 23 communicates with the gate 2 which is opened in the die surface 12 of the die member 18 via the seat 24. A guide member 26 is attached to the upper end of the sleeve 23, and the runner 13 and the hollow portion 25 of the sleeve 23 communicate with each other via the guide member 26.

A cylinder portion 27 that constitutes a gate opening / closing means is attached to the support member 20. The cylinder portion 27 has a casing member 29 that defines the cylinder chambers 28a and 28b, and a piston member 30 that is installed in the casing member 29. In this case, the casing member 29 is formed with a port 31a communicating with the cylinder chamber 28a and a port 31b communicating with the cylinder chamber 28b. Further, one end of the gate pin 14 is fixed to the piston member 30. The other end of the gate pin 14 reaches the gate 2 via the runner member 19, the guide member 26, and the sleeve 23.

Next, the operation of the injection molding machine will be described with reference to FIG. Air or the like is introduced into the cylinder chamber 28b through the port 31b of the casing member 29 which constitutes the cylinder portion 27, and air or the like is led out through the cylinder chamber 28a through the port 31a, whereby the gate pin 14 through the piston 30. Shift the gate upwards and open gate 2. Next, the injection nozzle 15 (see FIG. 2) is attached to the runner 13 of the movable side mold plate 10, and the core material made of PP, ABS resin or the like is injected into the runner 13 through the injection nozzle 15. . This core material is directed toward the fixed-side template 11 from the gate 2 through the runner 13 and the hollow portion 25 of the sleeve 23. (See Figure 2). After injecting a predetermined amount of core material from each gate 2, the gate 2 is closed under the action of the gate opening / closing means, and the movable side mold plate 10 is displaced toward the fixed side mold plate 11 to close the mold. Then, low pressure is applied at a constant pressure to perform molding. (See Figure 2).

In this case, cooling water is circulated through the cooling passage 17 provided in the mold member 18 and the cooling pipe provided in the backup body to cool and solidify the core material. Since the gate pin 14 constituting the gate opening / closing means opens / closes the gate 2 at the portion closest to the cavity, it is possible to control the supply amount of the resin as the core material to the cavity with high accuracy. Finally, the mold is opened and the product is taken out.

In the embodiment shown in FIG. 4, the number of gates 2 is reduced to four to reduce the die cost.

Although the number of gates is 6 and the number of gates is 4 in the present embodiment, the core material manufacturing apparatus for an automobile door trim of the present invention is not limited to these. Needless to say, it is sufficient if the weld line occurs in a range where the occupant collides during a side collision due to the gate position, the increase / decrease in the number of gates, and the adjustment of the amount of resin injected from each gate.

[0016]

[Effect of device]

 As described in detail above, in the core material for an automobile door trim of the present invention and its manufacturing apparatus, the position of the weld line is collided by side collision by adjusting the gate position and the amount of resin injected from each gate. Since it is set to the range where the occupant sometimes collides, the resin core material breaks from the weld line and absorbs energy during a side collision, so energy absorption during a side collision can be sufficiently performed without using a cushioning material or a shock absorbing pad. Have the effect.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a core material for an automobile door trim according to the present invention.

FIG. 2 is a schematic view of an injection molding machine as a core material manufacturing apparatus for an automobile door trim according to the present invention.

FIG. 3 is a cross-sectional view of the essential parts of an automobile door trim core material manufacturing apparatus according to the present invention.

FIG. 4 is a front view showing an embodiment of a core material for an automobile door trim according to the present invention.

FIG. 5 is a front view showing a core material of an automobile door trim showing an example of a conventional example.

FIG. 6 is a front view showing an energy absorbing structure on a side portion of a vehicle body showing an example of a conventional example.

[Explanation of symbols]

 1 Core material for automobile door trim 2 Gate 3 Weld line 5 Range where passengers collide in a side collision 10 Movable side mold plate 11 Fixed side mold plate 13 Runner 14 Gate pin 15 Nozzle

Claims (2)

[Scope of utility model registration request] 1. A core material for an automobile door trim, wherein a plurality of weld lines are set in a range where an occupant collides with the vehicle door trim rear side collision. 2. A stationary mold plate having a mold surface corresponding to one outer shape of a core material of an automobile door trim, a movable mold plate having a mold surface corresponding to the fixed mold plate, and a plurality of gates. An injection molding machine comprising a connecting runner and an injection nozzle for supplying a resin as a core material of an automobile door trim to a gate through the runner, a mold corresponding to a position in or near a range where an occupant collides during a side collision. An apparatus for manufacturing a core material for an automobile door trim, characterized in that at least three gates are provided on the die surface of the plate.