JP3151926U - Hollow tube for bicycle structure - Google Patents

Abstract

A hollow tube body for a bicycle structure made of a 6-4Ti alloy plate material and having high strength and durability. A 6-4Ti alloy sheet is fed at a certain angle onto a molding part of a cylindrical molding die having a molding part 41 having a small diameter and a delivery part 42 having a larger diameter. Forming is performed by punch press processing between the convex pressing side 43 provided on the mold surface and the concave part 51 provided in the punch press opposite thereto, and the plate material is spirally formed and wound around the forming part, The spiral side edges are welded together to form a hollow tube. [Selection] Figure 3

Description

  The present invention relates to a hollow tube, particularly used to manufacture a hollow body of a bicycle body, and a 6-4Ti alloy sheet is formed by a cold rolling press to form a spiral hollow tube. In addition, it is a hollow tube body for a bicycle structure that is formed by welding and joining spiral side edges and has good strength and is difficult to deform.

  With the changing times, the use of bicycles is not only a means of transportation, but also has the meaning of leisure, recreation and sports. Public institutions are actively building bicycle paths and cyclists in each area to provide more bicycle users. In addition, bicycle manufacturers have improved their research and development, and bicycles with various functions are being manufactured one after another. Effective materials have been developed to meet the requirements of bicycle body strength, weight, etc. It has come to meet the demand. FIGS. 1 and 2 show a known method for manufacturing a pipe body of a bicycle body, in which a hollow tube body 10 is generally manufactured from a metal plate material such as iron or aluminum alloy by a welding method (ie, a welded tube). In the process of pressing the metal plate 11 by the rotation of the roller, the flat metal plate 11 is formed in a circular tube shape, and both end edges of the metal plate 11 made circular by the roller are welded to form a complete hollow tube. Make body 10. In the hollow tube 10 manufactured by the above-described process, the welded portion 12 to be welded is in a straight line, and the welded portion 12 is relatively weak to stress when viewed from the entire hollow tube 10. The hollow tube body 10 is easily deformed from the welded portion and easily broken. Therefore, in order to apply high-quality pipe parts to a bicycle body, there are some which adopt titanium metal or titanium alloy as a material for a hollow tube body. When a pipe product is made of titanium metal or an alloy thereof, it has good functions such as rust resistance, light weight, and high strength.

JP 2006-272457 A

    The problem to be solved is that titanium metal is a metal material with special characteristics, so the processing method is complicated, and titanium metal is a metal with a high coefficient of elasticity, so the spring back is large. Plastic working is difficult. General cold working methods require special measures. For this reason, the present inventor has studied this area for a long time, has chosen to use a 6-4Ti alloy (Ti-6AL4V) as a base material, and used a cold rolling press and a welding method to produce high quality pipes. By manufacturing a part and applying it to a bicycle body tube part, a hollow tube body for a bicycle that is lightweight, has high tensile strength, and has fatigue resistance is provided.

  The present invention is a hollow tube used for a bicycle structural material, and the hollow tube is made of a 6-4Ti alloy plate, and the alloy plate is formed into a spiral shape by a cold punch press on a forming die. It is a hollow tube for a bicycle structure formed by spirally winding on a mold and then welding the spiral side edges.

  The bicycle hollow tube of the present invention has a high strength and is difficult to deform by forming a spiral hollow tube and welding the spiral side edges to form a hollow tube. There are advantages.

It is a well-known hollow tube forming instruction diagram. It is a well-known hollow tube solid figure. It is one of the pipe body shaping | molding instruction | indication drawings of this invention. It is one of the instruction figures which press a 6-4Ti alloy board | plate material by the cold rolling of this invention. FIG. 2 is an instruction diagram for pressing a 6-4Ti alloy sheet by cold rolling according to the present invention. It is 2 of the pipe body shaping | molding instruction | indication drawing of this invention. It is a welding instruction | indication figure of the pipe body of this invention. It is a pipe solid figure of the present invention. It is a contraction tube formation instruction figure of a tube of the present invention. It is a three-dimensional view after contraction of the tubular body of the present invention.

  In order to improve the problem that the quality of the known hollow tube body is not good, a hollow shaped tube body is formed by welding a spirally formed 6-4Ti alloy plate material. Accordingly, it is an object of the present invention to have an advantage that when the pipe body is applied to a bicycle body frame, it has good strength and is hardly deformed. In order to achieve the object, the present invention places a 6-4Ti alloy sheet on a receiving mechanism, supplies the 6-4Ti alloy sheet, and sends it to a forming die. The material to be molded is formed into a spiral tubular shape, inserted into a molding die delivery section and wound, and then the spiral side edges are welded and joined to complete a hollow tube.

  The present invention relates to technical means applied to achieve the object, and will be described in detail below with reference to the accompanying drawings.

  As shown in FIG. 3, in the present invention, the 6-4Ti alloy sheet 20 is placed on the receiving mechanism 30, and the 6-4Ti alloy sheet 20 is sent out via the receiving mechanism 30. After taking out the material, welding is performed on the molding die 40. The 6-4Ti alloy sheet 20 has an appropriate width and a thickness of 3 mm or less. The molding die 40 is a cylindrical molding rod, the front end is a molding part 41, and the rear end is a delivery part 42. The cross-sectional diameter of the molding part 41 is slightly smaller than that of the delivery part 42, and the pressing part 43 protrudes from the surface of the molding part 41, and a press 50 is installed above the pressing part 43. The press 50 continuously moves up and down by transmission of a punch press machine, and includes an inner concave portion 51 at the bottom of the press 50, and the inner concave portion 51 and the pressing side 43 correspond to each other. As shown in FIGS. 4 and 5, when the 6-4Ti alloy sheet 20 is sent to the molding die 40 via the receiving mechanism 30, a certain angle is provided between the 6-4Ti alloy sheet 20 and the molding die 40. To send. The angle is preferably 40 to 50 degrees. When the 6-4Ti alloy sheet 20 is sent to the pressing side 43 of the molding part 41 of the molding die 40, it is pressed and deformed under the pressure of the press 50. The degree of deformation of the 6-4Ti alloy sheet 20 is determined in accordance with the shape of the pressing side 43 and the inner recess 51 at the bottom end of the press 50, and in particular, it is necessary to consider the amount of elastic recovery (that is, memory characteristics) of titanium metal. After the press punching, the 6-4Ti alloy sheet 20 is inserted into the outer surface of the delivery part 42 having a diameter slightly larger than the molding part 41 by a predetermined molding, and continuously feeds out the work and press punches repeatedly. A tube-shaped body is formed in a spiral shape, and is further inserted through the delivery portion 42 of the molding die 40. When the tubular body is finished to a predetermined length, the tubular body is taken out from the delivery portion 42 of the molding die 40. (See FIG. 6). The 6-4Ti alloy sheet 20 after the cold rolling press has a relatively close spiral gap, and both ends of adjacent spiral patterns of the spiral hollow tube material are welded and joined by the welding mechanism 60. Then, a hollow tube body 70 is formed (see FIGS. 7 and 8). As shown in FIGS. 9 and 10, in order to obtain a 6-4Ti alloy hollow tube having better mechanical properties, the tube 70 that has been welded is subjected to a contraction operation with a press die 80. This is because the press alloy tube 80 is slightly smaller than the outer diameter of the tube 70, and when the press shrinkage is performed, the titanium alloy crystal grains change to a finer structure, and the tensile strength and fatigue resistance of the titanium alloy are further improved. At the same time, the surface structure of the titanium alloy is processed, the welded portion on the surface of the tube body 70 disappears, and the filed process on the surface of the tube body 70 can be saved. The tubular body 70 after the contraction work is annealed by heating at about 600 degrees in an inert gas atmosphere, and when the residual stress heat treatment step of the tubular body 70 is completed, the tubular body 70 has high strength. Good quality with improved spreadability.

By forming the tubular body 70 described above, the tubular body 70 deforms the 6-4Ti alloy plate material 20 with a cold rolling press, forms it into a spiral tubular shape body, and spirally adjoins the tubular shape body. The opposite ends are welded and joined to each other by a welding mechanism 60 to form a tubular body. Therefore, since the welded portion of the tube body 70 is spirally averaged and distributed around the periphery of the tube body 70, the stress of the entire tube body 70 is averaged, thereby improving the strength and the deformation rate. Go down. At the same time, the 6-4Ti alloy has advantages such as good tensile strength, light weight, and corrosion resistance. Therefore, when the tube body 70 is applied to a bicycle body tube component, the bicycle quality and performance are improved. In order to test the characteristics of the pipe part structure of the present invention, the applicant of the present invention tested the yield strength, tensile strength and elongation rate of the pipe part of the present invention (consigned to Taiwan Science and Technology Co., Ltd.). Carried out. Among them, the yield strength (0.2% offset) was 1042 N / mm ² , the tensile strength was 1113 N / mm ² , and the elongation (GL 50 mm) was 13%. It can be seen that the performance of the tubular body 50 of the present invention is reliably improved compared to the mechanical properties of known tubular materials.

  As can be seen from the above description and the embodiments shown in the drawings, the present invention is certainly advanced as compared with a general known tubular structure, and its application technical means are those researched and developed by the present inventors. . Therefore, the present invention meets the application requirements. In addition, the above-described structure of the present invention is a preferred embodiment of the present invention, and equivalent changes depending on all the structures of the present invention belong to the claims of the present invention.

DESCRIPTION OF SYMBOLS 10 Hollow tube body 11 Metal plate material 12 Welding part 20 6-4Ti alloy board | plate material 30 Receiving mechanism 40 Molding die 41 Molding part 42 Sending part 43 Press side 50 Press 51 Inner recessed part 60 Welding mechanism 70 Tube 80 Press die

Claims (3)

In hollow tubes for bicycle structural materials,
6-4Ti alloy sheet material is bent and deformed by a press punch, wound around a forming die in a spiral shape with a circular cross section, and welded and joined to the side edges of the helical tube. A hollow tube body for bicycle structural materials. Forming the 6-4Ti alloy sheet by press punching
A press punch having a diameter of a molding part for performing press punching of a molding die is smaller than a diameter of a feeding part around which the helical material to be molded after molding is formed, and a pressing side protruding from the surface of the molding part, and is opposed thereto The hollow tube for a bicycle structure material according to claim 1, wherein a concave portion is provided in the press punching and reciprocating press molding of the press punch.   2. The bicycle structure material according to claim 1, wherein the 6-4Ti alloy sheet material has a thickness of 3 mm or less, and an angle when being supplied to the molding die is between 40 degrees and 50 degrees. Hollow tube.

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