JPS60189426A - Winding method of ring - Google Patents

Abstract

PURPOSE:To enable to improve productivity, by a method wherein a pair of bobbins is fixed in a confronting state with a shuttle and a prepreg tape is wound up at orientation of a predetermined angle through revolving of a core material 3, in manufacture of a steering wheel. CONSTITUTION:Simultaneously with turning of a prepreg tape 5 around a core material by turning a shuttle 2 around the shaft center O2 of the core material 1 at the rate of N2, the core material 1 is turned centering around the central axis O1 at the rate of N1, the tape 5 is pulled out of a bobbin 3 and the tape 5 is wound round the core material 1 by orienting the tape 5 at fixed pitches and a fixed angle theta. Now, when the pitch P of the tape 5 is obtained through an expression of P=piD+P/m by making the number of pieces of the bobbins 3 and the diameter of the center of the core material m1 and D respectively, the tape 5 is wound round the core material 1 by slipping by the width of the tape after a roll of the tape round the core material 1 has been made, and then when the two bobbins 3 are provided in case m=6, the tape 5 can be wound round the whole surface of the core material 1 through three turns of the core material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for winding a ring made of unidirectional fiber-reinforced plastic, such as a rim of a steering wheel, to reduce weight.

[Prior art]

Conventionally, as a method of obtaining a lightweight and highly rigid ring reinforcement for the ring-shaped rim of a steering wheel, which is subjected to bending and torsion, for example, unidirectional fiber reinforcement such as thin carbon fiber or glass fiber of 0.2 to 0.5 m was used. A ring reinforcing body can be obtained by winding a plastic prepreg tape around a core i made of a six-ring shaped lightweight plastic foam at a pitch of a constant angle.

However, there is no suitable method for mass-producing ring reinforcing bodies in the prior art.

There are toroidal type winding machines for electromagnetic coils and ring-shaped outer layer wrapping machines. A toroidal winding machine finely winds a single coil wire with a round cross section around an iron core, and obtains magnetic force by changing the number of turns.

Furthermore, a ring bandaging machine wraps the tape around the bandaged item, and in either case, it is not possible to orient the thin tape at a constant pitch, and also to align and wind multiple tapes at the same time.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional products as described above, and by aligning and winding several prepreg tapes at a pitch with a constant winding angle around the core material, it can be mass-produced and strengthened. [Embodiment of the Invention] The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of the device; FIG. 2 is a sectional view taken along the line ■--■ in FIG. In the figure, l is a ring-shaped core material made of lightweight plastic foam, and the central axis is 0. It rotates clockwise at a constant speed N1 around . Reference numeral 2 denotes an annular shuttle which rotates at a speed N about the axis 02 of the core material 1, and a pair of bobbins 3, 3 facing the shuttle 2 are attached via frames 4, 4. 5 is a prepreg tube made of unidirectional fiber-reinforced plastic such as carbon fiber or glass fiber with a thickness of 0.1 to 1.0 mm wound around both bobbins 3, and the end of the tape 5 is attached to the core material 1 with adhesive tape. etc. is fixed.

Next, the operation will be explained. Around the axis O8 of the core material 1 The shuttle 2 rotates at a speed N to rotate the prepreg chive 5 around the axis of the core material, and at the same time rotates the core material 1 around the center axis 01
Turn tape 5 once at speed N with wo as the center, and transfer tape 5 to bobbin 3.
By pulling out the prepreg chives 5 from the core material 1, winding can be performed in which the prepreg chives 5 are oriented at a constant pitch P and at a constant angle θ.

Here, the pitch P of the tape is the number of revolutions n! of the shuttle 2 when it makes one revolution with the core material 1 as the center axis 0 and the entire center. is determined by the formula below.

In order to finish winding with one rotation of several core materials,
Although nl needs to be an integer, the number m of bobbins 3 is m=W since the tape is wound over the entire outer surface of the core material 1.

700 T W is the width of the prepreg chive 5, and since the core material 1 is ring-shaped, it cannot be widened to fit the core material, and in the case of a steering wheel, it is 5 to 15 m. The number of pobbins 3 is also 5 to 10. Therefore, when the number of bottles increases, it becomes time-consuming to pull out the prepreg tube from each bottle and attach it to the core l before winding, and to cut each tape after winding, which reduces productivity for mass production. Moreover, since the shuttle 2 rotates so as to cross the core material 1, the size of the shuttle is limited by the size of the core material, and the space for installing the bobbin 3 is limited, but the installation of the bottle becomes complicated. First, since the size of each bin cannot be increased, the amount of tape 5 that can be wound up cannot be increased, and the number of times the bobbin 3 must be replaced increases, reducing product productivity.

Therefore, in the present invention, when the pinch P of the tape is entwined with P#πD0-, the prepreg tape 5 is wound with a deviation by the width of the prepreg tape after going around the core material l once.
After the next round, the tape is further shifted by the width of the tape 2. Therefore, when m=6, if two bobbins 3 are provided as in the embodiment, the entire surface of the core material 1 can be wound with prepreg tape if the core material 1 rotates three times. Note that if three bins 3 are provided at equal positions on the shuttle 2, the core material 1. can wind prepreg chive 5 in 2 turns.

〔Effect of the invention〕

As described above, according to the present invention, the l
By attaching a pair of bins and making it possible to wind the prepreg chives over the entire surface of the core material at a predetermined angle in three rotations of the core material, the number of bobbins can be reduced and the work of attaching and cutting the prepreg tape to the core material is simplified. Easy to do and increases productivity. Furthermore, since a large space is available for attaching the bobbin to the shuttle, a bobbin with a large diameter can be used, and a large amount of prepreg chives can be wound up. Furthermore, since the number of bins is small, it is possible to replace the main bin in a short time when the tape runs out.

[Brief explanation of drawings]

FIG. 1 is a plan view of an apparatus for carrying out the winding method of the present invention, and FIG. 2 is a sectional view taken along the line n--■ in FIG. l...core material, 2...shuttle, 3...bobbin, 5
...Prepreda tape. In addition, in the drawings, the same reference numerals indicate the same or equivalent parts O Agent: Masuo Oiwa

Claims (1)

[Claims] In a method for a ring-shaped core material, an annular shuttle is arranged around the axis of the core material, and a unidirectional fiber-reinforced plastic prepreg tape wound around a bobbin provided on the shuttle is wound around the core material. Two bobbins are provided on the shuttle at opposite heights, and the shuttle is rotated at a constant speed to rotate the prepreg tape, and at the same time, the core material is rotated at a predetermined speed around the central axis to draw out the tape. A ring winding method characterized in that the prepreg tape is wound over the entire surface of the core material at a predetermined angle in three rotations.