TWI251059B - Method for manufacturing helical springs made of composite materials - Google Patents

Abstract

A method for manufacturing helical springs made of composite materials, comprises the steps of: preparing a mold having a bottom engagement unit, an outer ring engaged to the bottom engagement unit, a top engagement unit capable of moving towards the bottom engagement unit, a middle ring affixed to the top engagement unit, a retractable central axis provided to a center of the middle ring, a resilient positioning member wound about the central axis and having a helical configuration, a composite material strip wound about gaps between the central axis and helix of the positioning member; descending the top engagement unit and middle ring such that the middle ring compresses the resilient positioning member and composite material strip, and heating the composite material strip to form a helical spring having both ends that are of a straight configuration. This invention does not require secondary working, eliminates parting lines and enhances structural strength.

Description

1251059 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a coil spring, and more particularly to a method of manufacturing a composite spiral magazine which is manufactured by using a composite material and which can reduce processing procedures and increase strength. [Prior Art]

According to the general, the spiral spring is made of steel, and the revolving force of the steel itself enables the spirally wound coil spring to absorb the axial force. Therefore, the coil spring is generally used in various mechanisms. Such as cars, locomotives and even bicycle suspension suspension systems, or general industrial machinery.

Taking the bicycle suspension suspension system as an example, the bicycle frame and the rim are continuously developed in a lightweight direction in order to improve the performance of the bicycle. However, frames, rims, etc. are gradually manufactured using high-strength and lightweight materials such as aluminum alloys, magnesium alloys, carbon fibers, and even titanium alloys. The coil springs are only in the stage of steel manufacturing. Although the steel has high strength, high rigidity and good elasticity, the steel coil spring also has the disadvantage of heavy weight, and the aftershock caused by the resilience of the steel elastic after the force of the screw is also Due to the heavier weight, the inertial force is increased, which increases the amplitude and causes unnecessary aftershocks. Moreover, the steel itself has good elasticity, so the vibration of the coil spring itself cannot be absorbed by the steel itself, but needs to be transmitted outward to eliminate these forces. Therefore, most of the suspension suspension system will add damping. The agency absorbs these forces and increases the complexity of the mechanism and the total weight of the entire system.

Page 5 1251059 _ii- - ·ή^ - φ-jv)h lvi v y In addition, in order to increase the bearing strength of the coil spring, it is usually used to increase the strength of the steel or increase the diameter of the steel. However, these practices The weight of the manufactured coil spring is increased, so that the current steel coil spring is actually improved. In order to improve the above disadvantages, the industry has developed a coil spring made of a composite material to greatly reduce the weight of the coil spring and maintain a moderate elasticity, such as U.S. Patent No. 4,7 6 5,601, which is a composite. a coil spring of material, but the coil spring is bent in a hook shape on both inner sides, and if a composite coil spring is manufactured by the current manufacturing method, it is necessary to manufacture by a complicated mold, and due to the material properties of the composite material, When the mold is opened, it is not allowed to be deformed too much, otherwise the coil spring may be broken or damaged. Therefore, the composite material is manufactured into a coil spring, and the technicality of its manufacture is still to be overcome. A general manufacturing method is disclosed in U.S. Patent No. 4,260,147, which is provided with a spiral gap by a mold for inserting a composite strip and then forming by heating to form a composite spiral. Spring, but because the spacing formed by the mold is the same, and can not be designed according to the needs of the coil spring, providing a variety of spacing changes, for example: the elastic modulus of the two ends of the coil spring is different, resulting in limited application range, and each manufacturing Coil springs with different pitches need to be replaced with different molds, resulting in an increase in mold cost. In addition, this method combines the structure of a central mold to form a composite spiral spring, thus causing multiple parting lines. However, there is still a defect in the manufacturing method of the above-mentioned composite coil spring, and therefore there is at least a drawback in the implementation of the use as follows:

1251059 V. INSTRUCTIONS (3) 1 • Poor manufacturing effect When the above-mentioned coil spring is used in the left and right molds or the combined mold splitting mold, it is easy to generate a plurality of parting lines to form stress concentration points. 2 · Trouble in processing The coil spring is limited by the setting of the mold and cannot form a flat shape at both ends. Therefore, after the split spring is split, it still needs to be processed to flatten the ends of the coil spring, which increases the complexity and processing of the machining. cost. 3 · Reduce the strength

The two ends of the spiral magazine are flattened at a thinner portion, which is liable to cause problems such as insufficient structural strength; and the product has a plurality of parting lines which tend to cause stress concentration and reduce the strength thereof. 4 · Increasing the cost When manufacturing the spiral springs of different sizes (such as different inner diameters) or pitches, it is necessary to redesign the entire set of molds and replace them all, and the commonness of the molds is low, thus greatly increasing the manufacturing cost. [Summary of the Invention]

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for manufacturing a composite coil spring which solves the above problems and which has the advantages of a coil spring effect, a simplified machining, an increase in the strength of the coil spring structure, and a reduction in processing cost. For the purpose of the foregoing, the present invention includes: preparing a mold in advance, and the mold is a lower joint, a ring coupled to the lower joint, an upper joint, and a ring coupled to the upper joint. a telescopic to the central axis of the middle ring, and a center of the outer ring is formed with a consistent perforation, the through hole and the middle

Page 7 1251059 V. Description of the Invention (4) A ring-shaped accommodating space is formed between the mandrels, and a spiral shaped member is pre-formed, and the forming member is wound around the outer circumference of the central axis, and then spirally a strip of composite material is spirally wound between the gaps of the forming member for forming a spiral shape of the composite material strip, and then a central axis of the forming member and the strip of composite material is placed in the outer ring, so that the The forming member and the composite strip are placed in the accommodating space, and when heated by the mold, the upper joint is moved downward to drive the middle ring to descend along the central axis, and the forming member and the composite strip are pressed After the heat is applied to compress and shape the composite strip, the upper joint is moved up, the middle ring, the central shaft, the composite strip and the forming member are moved up, and the composite material is separated from the formed composite material. The ring is then separated from the central shaft and the formed member to obtain a composite coil spring. The above and other objects and advantages of the present invention will be readily understood from Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings. [Embodiment] Please refer to Fig. 1 to Fig. 9, which shows the structure of the embodiment selected for the present invention, which is for illustrative purposes only and is not limited by this structure in the patent application. The manufacturing method of the composite spiral magazine of the present embodiment, as shown in FIGS. 1 to 3, the manufacturing steps thereof include: preparing a mold: preparing a joint joint 1 〇 , an outer ring 1 1 , a

1251059 V. Description of the Invention (5) The central ring 1 2 , a central shaft 1 3 and an upper coupling seat 1 4 , the lower coupling seat 10 is recessed with a lower gap 1 0 0 , and the lower coupling seat 10 is A positioning bolt 1 0 1 is respectively disposed on opposite sides of the lower gap 1 0 , for the opposite sides of the bottom of the outer ring 1 1 to be provided with an inverted L-shaped positioning groove 1 1 〇, so that the outer ring 1 1 The two positioning slots 1 1 〇 are aligned with the two positioning bolts 1 〇 1 , and the outer ring 1 1 is rotated by an angle of the two positioning slots 1 1 〇 to fix the outer ring 1 1 to the lower joint 10 . The center of the outer ring 1 1 is formed with a uniform through hole 1 1 1 . Similarly, a receiving hole 14 1 is formed in the center of the upper connecting seat 1 4 , and the receiving hole 14 1 is oppositely disposed. The screw 1 1 0 ^ and the middle soil 1 2 are correspondingly provided with two positioning slots 1 2 1 for the middle ring 12 to be fixed to the upper binding seat 14 , and the middle ring 12 is centrally provided with a class of different sizes The hole 1 2 0 , and the outer diameter of the middle ring 12 is the same as the outer diameter of the through hole 1 1 1 of the outer ring 1 1 , and the central axis 13 is different from the class hole 1 2 0 . Large diameter section 1 3 And a small diameter section 1 3 1 , the small diameter section 1 3 1 is axially recessed with a plurality of grooves 1 3 2 , and the large diameter section 1 3 0 can be locked in the middle hole of the middle ring 12 1 2 0 small hole end, preventing the large diameter section 1 3 0 of the central shaft 1 3 from being pulled out from the bottom of the middle ring 12 2, so that the central axis 13 can be restricted to move to the class hole 1 2 0 of the middle ring 1 2 And the small-diameter section 133 extends through the middle ring 12, and forms a ring-shaped accommodating space 1 3 3 between the through-hole 1 1 1 and the central axis 13 (as shown in FIG. 3 °) The elastic molded part 20 is wound: a molded part 2 预先 which is formed into a spiral shape in advance, and the molded part 20 is elastic rubber material in this embodiment.

1251059 V. The invention description (6) (E 1 ast 〇mer ), and the forming member 20 has a spiral gap 2 1 (as shown in FIG. 6 ), and the forming member 20 is wound around the central axis 1 The small diameter section 1 3 1 of 3 is provided for the insertion of the composite strip in the spiral gap of the molded part 20 . The composite strip 30 is wound around the spiral of the shaped member 20 to be spirally wound to form the composite strip 30 in a spiral shape. Pressurized heating: Please refer to Fig. 5 at the same time, inserting the central axis 13 of the forming member 2〇 and the composite strip 30 into the outer ring 1 1 so that the forming member 20 and the composite strip 3 0 is placed in the accommodating space 1 3 3, and when heated by the mold, the upper joint 14 is moved downward, and the middle ring 12 is driven to descend along the central axis 13 , and the forming member 20 and The composite strip 30 is subjected to the pressure and heat of the middle ring 12 so that the composite strip 30 is hardened and shaped by the compression of the formed part 20, and if the pressure is too large, the composite strip 30 is excessively compressed. The problem may be caused by damage, for example, the problem of broken carbon fiber strips, and the present invention can provide the central shaft 13 by providing a plurality of grooves 1 3 2 and the gap 2 1 of the forming member 20 The space for the deformation of the fiber when the composite strip 30 is pressed reduces the problem of deformation. Opening the mold: Please also refer to FIG. 6 to move the upper joint 14 up, drive the middle ring 12 and the central shaft 13 up, and simultaneously drive the formed composite strip 30 and the forming. The piece 20 is pulled out of the outer ring 1 1 〇 to withdraw the central axis 1 3 : the central axis 1 3 is taken from the central ring 1 2

Page 10, 1251059 V. The invention description (7) and the upper joint 14 are extracted, so that the formed composite strip 3〇 and the formed part 20 are abutted by the end face of the middle ring 12, and are separated from the Center axis 1 3. The molded article 20 is peeled off. At the same time, the molded article 20 is compressed from the gap between the formed composite strips 30. Finished product: Please also refer to Fig. 8, the formed spiral composite material strip 30-coil spring; by the above steps, the manufacturing method of the composite material coil spring of the present invention is completed. Of course, there are still many examples of this creation, only the details change. Please refer to FIG. 9 , which is a second embodiment of the present invention, wherein the central shaft 15 is provided with a large diameter end 150 and a small diameter end 1 5 1 , and the surface of the small diameter end 15 1 is Smooth surface, the coil spring of the composite material can still be manufactured according to the above manufacturing method. The invention utilizes the above technical means, and has the following advantages after implementation: 1) Good manufacturing effect After the manufacture of the spiral magazine of the invention, a parting line is not formed at the periphery, and the coil spring can be provided When the force is applied, the force can be evenly dispersed to reduce the problem of stress concentration. 2. Simplified processing The two ends of the coil spring of the present invention can be directly formed into a flat shape at the time of molding, without being used for flattening both ends of the coil spring, thereby simplifying the processing steps of the coil spring.

Page 11 1251059 V. INSTRUCTIONS (8) 3 · Increased strength The coil spring of the present invention does not need to be flattened at both ends, and the outer diameters of the coil springs at both ends are the same, so that the problem of insufficient strength at both ends of the coil spring is not caused. Compared with the conventional coil spring, it increases its structural strength. 4 · Reduce the cost of the steps of the present invention, when manufacturing different sizes of coil springs, according to the outer diameter required of the coil spring, replace the outer ring mounted on the lower joint, and replace the inner diameter required by the coil spring The central ring and the central axis are used to adjust and change the outer diameter, inner diameter and thickness of the coil spring, and according to the size change of the coil spring, the outer ring, the middle ring and the central axis are changed, and the entire mold is not required to be replaced, thereby greatly reducing the cost of the mold. In addition, the replacement of the forming member to change the spiral pitch of the forming member can be changed in accordance with the elastic design of the coil spring, greatly increasing the manufacturing range of the manufacturing coil spring, and eliminating the need to replace the entire set of molds, thereby reducing the cost of the mold. And the formed part can be reused, which can greatly reduce the manufacturing cost. The above description of the embodiments is intended to be illustrative of the invention, and is not intended to limit the scope of the invention. From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

Page 1251059 Brief Description of the Drawings [Simple Description of the Drawings] Fig. 1 is a block diagram of the manufacturing of the present invention. Figure 2 is an exploded perspective view of the components of the mold of the present invention. Fig. 3 is a schematic view showing the accommodation space for accommodating the composite material and the formed member when the mandrel and the middle ring of the present invention penetrate the outer ring. Figure 4 is a cross-sectional view showing the combination of the unpressurized state of the present invention. Fig. 5 is a sectional view showing the combination of the present invention after pressurized heating. Figure 6 is a perspective view of the present invention after demolding. Figure 7 is a perspective view of the molded article peeled off by the present invention. Figure 8 is a perspective view of the finished composite spiral spring of the present invention. Figure 9 is a perspective view of another central axis embodiment of the present invention. [Description of the figure] (In part of the invention) Lower joint 1 Lower clearance 1〇〇 Positioning bolt 1〇1, 1 4〇 Outer ring 1 1 Positioning groove 1 1〇, 1 2 1 Through hole 1 1 1 Middle ring 1 2 Class hole 1 2〇Center axis 1 3 Large diameter section 1 3〇 Small diameter section 1 3 1 Groove 1 3 2 accommodating space 1 3 3 Upper coupling seat 1 4 accommodating hole 1 4 1 Forming member 2〇 Composite strip 3〇

Page 13

Claims (1)

1251059 VI. Patent Application No. 1 · A method for manufacturing a composite material spiral magazine, comprising: winding a forming member: spirally forming a forming member outside a central axis, so that the wound forming member has a spiral gap And the central shaft system is movable in a middle ring; the composite material strip is wound around: the composite material strip is disposed around the outer circumference of the central shaft, and spirally wound along the spiral gap of the forming member for the composite material The strip is formed in a spiral shape; pressurized heating: inserting a central shaft around the formed part and the strip of composite material into an outer ring, so that the formed part and the composite material strip are formed in the central axis and the middle ring and the outer ring One of the accommodating spaces; and then lowering the middle ring along the central axis, compressing the forming member and the composite strip, and simultaneously heating the mold to a hardening temperature of the composite strip to shape the composite strip; The finished product is taken out: the composite material is separated from the central shaft and the formed member, thereby obtaining a composite spiral spring. 2. The method of manufacturing a composite coil spring according to claim 1, wherein the middle ring is combined with an upper joint, and the outer ring is combined with the lower joint. 3. The method of manufacturing a composite coil spring according to claim 2, wherein the lower joint has a lower recess in the central recess, and the lower joint protrudes from the opposite sides of the lower gap. a bolt for the opposite sides of the bottom of the outer ring to be provided with an inverted L-shaped positioning groove, so that the two positioning grooves of the outer ring are aligned with the two positioning bolts, and the outer ring is rotated by an angle of the two positioning grooves. To fix the outer ring Page 14 1251059 6. The patent application scope is in the lower joint seat, a receiving hole is formed in the center of the upper joint seat, and the positioning hole is oppositely provided with two positioning bolts, and the middle ring is correspondingly provided with two positioning grooves, The middle ring is fixed to the upper joint. 4. The method of manufacturing a composite coil spring according to claim 1, wherein the center of the middle ring is provided with a class hole having a different aperture, and the central axis is different from the outer diameter of the class hole. a diameter section and a small diameter section, and the large diameter section can be locked at the small hole end of the middle hole of the middle ring to prevent the large diameter section of the central shaft from coming off from the bottom of the middle ring, so that the central axis can be limited to move a class hole of the middle ring, and the small diameter segment passes through the middle ring to move axially in the accommodating space. 5. The method of manufacturing a composite coil spring according to the fourth aspect of the invention, wherein the small-diameter section of the central shaft has a plurality of grooves in the outer circumference. Page 15