JPH02243175A - Manufacture of ski - Google Patents

Abstract

PURPOSE:To increase the degree of freedom of design by providing a reinforcing member partially on the peripheral side part in advance when putting a thermal pressure on tubes of molding material of central core that is arranged in a space for molding of a central core in a mold, while swelling them by putting internal pressure. CONSTITUTION:In manufacturing a ski, on the internal base of a lower mold 22, surface decorative sheet 31, top edge 32, 32 on the right and left, and hardened upper and lower two-layer FRP 33, 34 that will be top stiffening plate are positioned and laminated in order, and moreover side plate 35, 35 on the right and left are added. In a space 23 for molding of a central core, a pair of materials for molding of a central core 40, 40 on the right and left which are made of tube 42 wound round with FRP molding material 41 are provided. Other FRP molding material 43 is wound round the part in advance where twisting strength or flexibility are adjusted, on which hardened two-layer FRP that will be bottom stiffening plate, sole edge 53, 53 on the right and left, and bottom face plate 54 are positioned and laminated in order, and clamped by an upper mold 21, then tube 42, 42 are placed thermal pressure while swelled by compressed air. Therefore, the degree of freedom of design is increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to fiber-reinforced plastics (hereinafter referred to as FR).
Regarding the manufacturing method of a ski with a hollow core consisting of P (abbreviated as P), in particular, by making it possible to attach a reinforcing member at an appropriate position on the outside of the core at the same time as forming the core. , torsional strength and flex can be easily partially adjusted.

[Prior Art] Conventionally, in this type of ski, when adjusting the torsional strength and flex in the vicinity of the front and rear fixed contact points in the longitudinal direction of the ski, the ski is laminated on the upper and lower surfaces of the central body forming the core. The arrangement and material of the strength members can be partially changed, for example by placing metal on both the front and rear ends of the ski, FRP or ABS resin in the middle, or changing the thickness distribution of the core in the longitudinal direction of the ski. The current situation is that this is done by changing things.

[Problems to be Solved by the Invention] However, in such conventional ski manufacturing means, when changing the arrangement and material of the strength members,
Not only does it take time to process each strength member, but also the positioning work within the mold during molding is complicated and difficult.

Furthermore, when changing the thickness distribution of the core, it is necessary to replace the mold, resulting in high costs and a lack of freedom in design.

[Object of the invention] This invention was made under the above circumstances, and its purpose is to easily make partial adjustments to torsional strength and flex, and to increase the degree of freedom in design. The purpose of the present invention is to provide a method for manufacturing skis that enables the following.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a center core forming space in a mold in which both upper and lower surface strength members and other ski upper and lower structural members are positioned and arranged. A core molding material in which a raw FRP molding material is wound around the tube is placed, and when the core molding material is hot-pressed while applying internal pressure to the tube to expand it, the core molding material is It is characterized in that a reinforcing member is partially attached in advance to the outer peripheral side of the molding material, and in this case, the reinforcing member is made of glass fiber, carbon fiber, Kevlar, etc. as reinforcing fiber. FRP molding raw materials (prepreg), metal sheets, etc. are preferably used.

Further, when using FRP molding green material as the reinforcing member, the arrangement direction of the reinforcing fibers may be different so as to intersect with the reinforcing fiber arrangement direction of the FRP molding green material constituting the core molding material. It is preferable to orient the material in parallel.

[Function] That is, in this invention, a core molding material in which a raw material for FRP molding is wound around a tube is placed in a mold together with both upper and lower strength members and other upper and lower ski constituent members. When applying internal pressure to the tube of the core molding material to prevent it from expanding and then heat-pressing it, a reinforcing member is partially attached in advance to the outer peripheral side of the core molding material. Therefore, it is possible to attach the reinforcing member to any position on the front, rear, left, or right sides of the ski.This makes it easy to adjust the torsional strength and flex even if the ski thickness is the same. The degree of freedom in design can be improved.

[Embodiments] The present invention will be described below with reference to illustrated embodiments.

As shown in FIG. 1, numeral 1 in the figure is a ski body according to the present invention manufactured by a manufacturing process described later. As shown in FIG. 2, this ski body 1 has upper and lower double-sided strength members 3.4 made of, for example, FRP, on both the upper and lower surfaces of a hollow core body 2 made of FRP. An on-ski direct contact component consisting of a decorative material 6, and an under-ski direct contact structure consisting of left and right sole edges 7.7 attached along the longitudinal direction of the ski at both left and right end edges in the ski width direction, and a sliding surface material 8. The core body 2 is integrally laminated with the left and right side members 9, and has two hollow portions 2a, 2a arranged symmetrically in the ski width direction.

Reference numeral 10 in the figure denotes a reinforcing member buried near the front and rear contact points a and b in the longitudinal direction of the ski main body 1, for example, near the front contact point a of the ski. This reinforcing member 10 is attached between the core 2 and the upper surface strength member 3 that form the core of the ski body 1, and thereby increases the torsional strength or flex in the vicinity of the ski front contact point a. In other words, in order to manufacture the above-mentioned ski according to the present invention, as shown in FIG. Using a mold 20 having a ski width dimension, a thickness dimension, and a length dimension, the inner bottom surface of the lower mold 22, which corresponds to the inner wall surface on the upper surface side of the ski, is preliminarily coated with a surface constituting the on-ski component. Decorative board 31. Both left and right top edges 32.32 and upper and lower two layers of hardened F that serve as upper surface strength plates
The RPs 33 and 34 are positioned and stacked in order, and left and right side plates 35 and 35 are attached along the inner wall surfaces of the left and right sides. Then, the core molding space 2 in such a lower mold 22
3, a pair of left and right core molding materials 40 and 40 each consisting of a tube 42 around which an FRP molding raw material 41 is wound is attached. At this time, the outer peripheral side portion of the core forming material 40.40 corresponding to the vicinity of the ski front contact point a, that is,
Another FRP molding raw material 43 serving as a reinforcing member is wrapped in advance around the part where torsional strength or flex is to be adjusted. Next, the upper and lower two layers of hardened FRP, the left and right sole edges 53, 53, and the gliding face plate 54, which will serve as the lower surface strength plate constituting the under-ski direct response component, are positioned and laminated in this order on top of the upper mold 21. After the mold is clamped, as shown in FIG. 4, each tube 42, 42 of the core molding material 40, 40 is heated and pressed while being expanded with compressed air (indicated by solid arrows). It is.

By the way, the tube 42 constituting the core molding material 40 is made of, for example, nylon or the like with a thickness of 30 to 100 μm.
The reinforcing fibers of the FRP molding raw material (prepreg) 41 that is wound around a single tube made of plastic film or a tube containing a core metal are used in the form of a cloth.

Various m-fiber forms such as bag weave, unidirectional fiber material, bias cloth, etc. are preferably used as needed, and in particular, FRP molding raw materials with diagonal unidirectional fiber materials as reinforcing fibers are used. The application of internal pressure (e.g. 0, 4 to 1
, 0 MPa), and if it is wound in two to three layers with the inclination directions symmetrical, it is effective in improving the torsional rigidity of the ski. Also,
As the reinforcing member, a green material for FRP molding using glass fiber, carbon #l fiber, Kevlar, etc. as reinforcing fiber,
Alternatively, a metal sheet or the like is preferably used, and in this case, when a raw material for FRP molding is used as a reinforcing member.

More effective reinforcement can be achieved if the reinforcing fibers are oriented in a different direction so as to intersect with the reinforcing fibers of the raw FRP molding material constituting the core molding material.

Furthermore, hardened FRP3 is used as both the upper and lower strength members.
3.34 and 51.52 were used, but multiple FRP
A green material for molding (prepreg) may be used, and its selection is arbitrary.

In addition, in the above embodiment, the tube 4 after thermoforming
2 may remain in the expanded state within the core body 2, or may be removed by shrinkage after hot-press molding, as shown in FIG.

[Effects of the Invention] As is clear from the above description, according to the present invention, in the center molding space in the mold in which the upper and lower surface image strength members and other ski upper and lower component members are positioned and arranged, A core molding material in which FRP raw material for molding is wound is arranged around the tube, and internal pressure is applied to the tube of the core molding material to make it swell while being hot-pressed, and the core molding material is heated. Since the reinforcing member is partially attached in advance to the outer circumferential side of the ski material, the reinforcing member can be attached at any position on the front, back, left, or right of the ski.

This makes it possible to easily and partially adjust torsional strength and flex even if the ski thickness is the same, and has the excellent effect of increasing the degree of freedom in design. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment of a ski according to the present invention, FIG. 2 is an enlarged sectional view of the main part near the ski front contact point taken along line nn in FIG. 1, FIG. FIG. 4 is also an explanatory diagram showing the manufacturing process. 20 ・ 21 ・ 23 ・ 31. 33° mold, upper mold, 22...lower mold. Space for core molding. . . . Direct response component on ski, . . Upper surface strength member, 40 ・ 41 ・ 42 ・ 43 ・ 51° 53, a ′. b Fist・・Material for core molding,・・Raw material for FRP molding,・・Tube. ...Reinforcement member (green material for FRP molding). 52... Lower surface strength member, 54... Ski-top direct response component.・Front ski landing point, ・Back ski landing point.

Claims (1)

[Claims] (1) In the core molding space in the mold where the upper and lower strength members and other ski upper and lower component members are positioned and arranged,
A core molding material in which FRP raw material for molding is wound is arranged around the tube, and internal pressure is applied to the tube of the core molding material to make it expand while hot pressing it, and the core molding is performed. 1. A method for manufacturing skis, characterized in that a reinforcing member is partially attached in advance to the outer peripheral side of the ski material.