CN1062647C

CN1062647C - Method for producing crank

Info

Publication number: CN1062647C
Application number: CN97101401A
Authority: CN
Inventors: 林玉琴
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-02
Filing date: 1997-01-02
Publication date: 2001-02-28
Anticipated expiration: 2017-01-02
Also published as: CN1186917A

Abstract

The present invention discloses a method for manufacturing cranks. A crank is divided into a handle raw body and an axle seat raw body. The ready-made handle raw body and axle seat raw body are then combined. An integrated crank is formed by coating a plastic shell body on the surface of the combination of the handle raw body and the axle base raw body. The manufacturing material of the cranks is largely saved, the production rate of the cranks is largely improved, and the efficacy of reducing crank manufacturing cost is reached.

Description

The manufacture method of crank

The present invention relates to a kind of manufacture method of crank.

The crank of known bicycle adopts integrated manufacture method, see also shown in Figure 1, crank raw material ball iron 1 is cut out suitable stock via cut-out program 2, make the raw material thermoplastic via stove heating schedule 3, via Luntai procedure 4 raw material is taken turns its length of exhibition then, crooked raw material one end becomes 90 degree via press-bending program 5 again, then enter forging molding program 6 and make raw material have the blank of crank, and the side cut processing 7 of removing waste material, carry out the boring and the axle bed boring 8 of the different bores in two ends up and down of handle body tail end screw again, extract rectangular opening 9 and enter, and enter piercing 10 in order to strut four jiaos of gradients of rectangular opening, carry out skiving ditch processing 11 and enter processing 12 with lathe again towards tooth, do appearance at last again and coat plastic casing 13, and a finished product 14, its processing procedure is quite numerous and diverse and consuming time, and must process in regular turn in order, if wherein a program has problem or accident takes place, the carrying out that then will delay other program thereafter, if and a program generation flaw is arranged then will all that has been achieved is spoiled, and the reason of its why so numerous and diverse consuming time and consume material, main be its be formed in one so.

Please continue and consult Fig. 2-3, and cooperation is consulted shown in Fig. 4-5, because settling, crank adopts a left side on bicycle, right opposed, and right crank is set up a tooth portion than left crank, in order to articulate the gear disk of bicycle, and but the interlock bicycle is advanced it, thereby just only lift the most complicated right crank and be illustrated, shown in Fig. 2-3, handle body 19 1 ends of crank are established a screw 15 as can be known, establish an axle bed 16 in other end, and axle bed 16 is 90 right angles of spending with handle body 19, on axle bed 16, establish a tooth portion 18, and in axle bed 16, establish an axis hole 17, axis hole 17 was as shown in Figure 4 by being that rectangular through-hole is by the punching technology originally, and straight hole is strutted into a gradient (as shown in Figure 5), because the handle body 14 of crank is very long, and an end must bend in order to forge into axle bed 16, so required stock is promptly essential more, add known crank forging manufacturing technique and mostly adopt the heat forged technology, being about to stock heats to high temperature and forges, thereby with regard to material, the effect of expanding with heat and contract with cold will be quite obvious, and be the high success rate of asking forging molding, can determine can not fail by forging molding so stock must be enlarged to, can carry out forging molding, invisible promptly produces a lot of waste materials, the hole wall of reprocessing axle bed need repeatedly be processed can moulding, when if the thickness of hole wall is not enough, must avalanche take place and come into failure one way, so consume that also must the increase material, really plastic to guarantee axle bed in order to avoid all that has been achieved is spoiled, it is many and numerous and diverse to add manufacturing process, thereby with regard to known method for manufacturing bicycle crank, real non-one good manufacture method.

Main purpose of the present invention is to provide a kind of manufacture method of crank, and the crank manufacturing process is simplified, and yielding capacity can significantly improve, and reduces the loss that precision machining is brought, and falls low material consumption, to save cost of material.

For reaching above-mentioned purpose, the manufacture method of a kind of crank of the present invention is that the crank branch is made as handle body substance and axle bed substance, the handle body substance made and axle bed substance is made up make again; Wherein the manufacturing process of handle body is that the stock that raw material cuts is inserted in the die cavity, be to have rectangular handle body by forging molding or die cast with material forming again, remove the side cut processing of waste material then, and at handle body tail end brill system screw, process the curved arc neck and a pin joint seat of depression at the end in addition of handle body, in pin joint seat, bore system profile of tooth pivoted hole again, even the complete moulding of handle body substance; The manufacturing process of axle bed is that the stock that raw material cuts is inserted in the die cavity, is the axle bed substance with pedestal by forging molding or die cast again, the tooth piece that the processing ring is established on pedestal, and in axle bed substance end face brill system one rectangular through-hole; The tooth piece of axle bed substance is inserted in the pivoted hole, tooth piece and serrate slot are meshed fully, by the piercing mode rectangular through-hole is strutted four jiaos of gradients again, make former rectangle straight hole have an awl degree of pulling out, and closely the top is solid to force tooth piece and serrate slot, promptly makes crank.

The combination manufacturing process of handle body substance of the present invention and axle bed substance is with after the engagement of the serrate slot of the tooth piece of axle bed substance and handle body substance, insert piercing in the die cavity again, and rectangular through-hole is strutted four jiaos of gradients by the piercing mode, force tooth piece and serrate slot closely by solid, and, make both tightr fixed because die cavity is spacing.

After adopting above-mentioned manufacture method, the present invention goes forward side by side separately, and the manufacturing process of crank is simplified, and material is significantly saved, and significantly improves speed of production, and reaches the effect that reduces the crank manufacture cost.

Below in conjunction with drawings and Examples the present invention is further described.

Fig. 1 is the manufacturing flow chart of known crank;

Fig. 2 is known crank processing schematic representation;

Fig. 3 is known crank stereo appearance figure;

Fig. 4 is that known crank axle bed is made the piercing schematic representation;

Fig. 5 commonly uses schematic representation after the crank axle bed piercing;

Fig. 6 is that handle system of the present invention is made routing routing diagram;

Fig. 7 is a handle body substance processing schematic representation of the present invention;

Fig. 8 is a handle body substance stereo appearance figure of the present invention;

Fig. 9 is an axle bed flow sheet of the present invention;

Figure 10 is a left crank axle bed processing schematic representation of the present invention;

Figure 11 is a right crank axle bed stereo appearance figure of the present invention;

Figure 12 is a right crank axle bed sectional view of the present invention;

Figure 13 is a left crank axle bed processing schematic representation of the present invention;

Figure 14 is a left crank axle bed stereo appearance figure of the present invention;

Figure 15 is a left crank axle bed sectional view of the present invention;

Figure 16 is handle body substance of the present invention and axle bed substance combination flow sheet;

Figure 17 is the sectional view after the right crank of the present invention is exercised piercing;

Figure 18 is the sectional view after left crank of the present invention is exercised piercing;

Figure 19 is the stereo appearance figure that right crank axle bed of the present invention does not coat plastic casing;

Figure 20 is a right crank finished product stereo appearance figure of the present invention;

Figure 21 is a left crank finished product stereo appearance figure of the present invention;

Figure 22 is the combination embodiment flow sheet of handle body substance of the present invention and axle bed substance.

See also shown in Figure 6, it is that raw material is cut suitable stock 20 that handle system of the present invention is made program, insert forging molding or die cast 21 in the die cavity, remove the side cut processing 22 of waste material then, be drilled with the screw 23 of handle body tail end again, and can get a handle body substance 24, please continue and consult Fig. 7, and Fig. 8 is consulted in cooperation, handle body substance 60 has a long handle body 61, and Yu Yiduan establishes a screw 62, and end then is arranged with a neck 65 and a pin joint seat 66 in addition, establish a pivoted hole 63 in pin joint seat 66, this pivoted hole 63 has serrate slot 64.

See also shown in Figure 9, axle bed manufacturing process of the present invention is that raw material is cut suitable stock 30, insert and carry out forging molding or die cast 31 in the die cavity, get final product an axle bed substance 32, please continue and consult shown in Figure 10-15, because the left side of bicycle, right crank is opposed mode, the tooth portion and the axle bed of right crank must be pivoted, in order to articulate the bicycle gears dish, the interlock bicycle advances it, thereby axle bed substance of the present invention also must follow old convention and set up separately, and axle bed substance 70 of the present invention, 80 have

identical pedestal

71,81, in pedestal 71, the tooth piece 72 that sets up strip on 81 separately, 82, and tooth piece 82 is long than tooth piece 72, and establish an edge portion 84 in tooth piece 82 upper ends, and offer a slotted eye 85, the slotted eye 85 next bindings rectangular through-hole 83 identical that be pivoted with tooth piece 72 in its top end, 73.

See also shown in Figure 16, handle body substance of the present invention and axle bed substance combination manufacturing process are the serrate slot engagements 40 with the tooth piece and the handle body substance pivoted hole of axle bed substance, carry out piercing 41 again, and can strut four jiaos of gradients of rectangular through-hole, force tooth piece and serrate slot closely by solid, appearance after combination coats plastic casing 42 again, and a complete finished product 43, please continue and consult shown in Figure 17-19, axle bed substance of the present invention and handle body fixed fully, be by one towards post to rectangular through-

hole

73,83 strut four jiaos of gradients, and the expander effect takes place, tooth piece and serrate slot are squeezed mutually, can be more closely by reaching fixed purpose fully admittedly.

See also shown in Figure 20-21, after crank of the present invention is finished, coat one deck plastic casing, and right crank be owing to must articulate the gear disk of bicycle in its appearance, thereby the one-body molded cover cap 95 of this plastic casing, use the gear disk that covers bicycle.

See also Figure 22, the combination manufacturing process of handle body substance of the present invention and axle bed substance is with after the serrate slot of the pivoted hole of the tooth piece of axle bed substance and the handle body substance engagement 50, insert piercing 51 in the die cavity again, removing can be by four jiaos of gradient that strut rectangular through-hole, force tooth piece and serrate slot closely by outside the solid expander effect, and spacing by die cavity, it is complete close fixed to utilize the beam tube principle that both are reached, appearance after combination can be covered plastic casing 52 again, get final product a complete finished product 53.

Claims

1, a kind of manufacture method of crank is characterized in that: the crank branch is made as handle body substance and axle bed substance, the handle body substance made and axle bed substance is made up make again; Wherein the manufacturing process of handle body is that the stock that raw material cuts is inserted in the die cavity, be to have rectangular handle body by forging molding or die cast with material forming again, remove the side cut processing of waste material then, and at handle body tail end brill system screw, process the curved arc neck and a pin joint seat of depression at the end in addition of handle body, in pin joint seat, bore system profile of tooth pivoted hole again, even the complete moulding of handle body substance; The manufacturing process of axle bed is that the stock that raw material cuts is inserted in the die cavity, is the axle bed substance with pedestal by forging molding or die cast again, the tooth piece that the processing ring is established on pedestal, and in axle bed substance end face brill system one rectangular through-hole; The tooth piece of axle bed substance is inserted in the pivoted hole, tooth piece and serrate slot are meshed fully, by the piercing mode rectangular through-hole is strutted four jiaos of gradients again, make former rectangle straight hole have-bore degree of pulling out, and closely the top is solid to force tooth piece and serrate slot, promptly makes crank.

2, the manufacture method of a kind of crank according to claim 1, it is characterized in that: the combination manufacturing process of handle body substance and axle bed substance is with after the engagement of the serrate slot of the tooth piece of axle bed substance and handle body substance, insert piercing in the die cavity again, and rectangular through-hole is strutted four jiaos of gradients by the piercing mode, force tooth piece and serrate slot closely by solid, and, make both tightr fixed because die cavity is spacing.