CN112388992A - Bicycle crank manufacturing process - Google Patents

Bicycle crank manufacturing process Download PDF

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Publication number
CN112388992A
CN112388992A CN201910748221.XA CN201910748221A CN112388992A CN 112388992 A CN112388992 A CN 112388992A CN 201910748221 A CN201910748221 A CN 201910748221A CN 112388992 A CN112388992 A CN 112388992A
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CN
China
Prior art keywords
handle part
bicycle crank
base material
fiber
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910748221.XA
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Chinese (zh)
Inventor
林展奕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201910748221.XA priority Critical patent/CN112388992A/en
Publication of CN112388992A publication Critical patent/CN112388992A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/72—Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3091—Bicycles

Abstract

The invention relates to a bicycle crank manufacturing process, which comprises the following steps: (a) providing a first handle part, a second handle part and a connecting piece, wherein the connecting piece is connected between the first handle part and the second handle part to form a base body; (b) providing a resin base material and a plurality of fiber tows, and stirring and mixing the resin base material and the plurality of fiber tows to form a coating base material; (c) providing a mold, placing the substrate and the coated substrate into the mold, and heating and pressurizing. The bicycle crank provided by the invention has the advantages of simple and quick manufacturing process, and the hot-pressing forming time only needs several minutes, so that the labor cost can be greatly reduced, the manufacturing process is quick, and the advantages of light weight, specific rigidity (rigidity/density), fatigue resistance, corrosion resistance and the like of the known attached carbon fiber crank are also realized.

Description

Bicycle crank manufacturing process
Technical Field
The invention relates to a manufacturing process of a bicycle crank.
Background
The bicycle has a history of one or two hundred years in the recent times of human beings, the convenience and labor saving degree of the bicycle is favored by the people to ride instead of walk, and the bicycle industry can manufacture lighter bicycle bodies with the strength not reduced too much along with the progress of modern material science, such as aluminum alloy or titanium alloy bicycle bodies, and later more people invent carbon fiber bicycle bodies which can have lighter weight than metal alloy so as to provide lighter riding experience.
However, the manufacturing process of the existing carbon fiber car body is to pre-soak the prepreg in the carbon fiber solution, then manually laminate the carbon fiber prepreg one layer, blow the air bag for forming, and finally perform the processes of hot pressing and the like, and the manufacturing process is very tedious and tedious, which can greatly increase the manufacturing cost and the manufacturing time, and the price of the attached carbon fiber car body is not good, so that the burden of the consumer for purchasing the attached carbon fiber car body is often too large and the air is bought, and the defect of urgent need for improvement exists.
Therefore, there is a need to provide a novel and improved bicycle crank process to solve the above problems.
Disclosure of Invention
The invention mainly aims to provide a bicycle crank manufacturing process, which has the advantages of high strength and light weight as the existing attaching type carbon fiber crank, and compared with the existing attaching type carbon fiber crank, the bicycle crank manufacturing process has the advantages of greatly reducing labor cost and being rapid in manufacturing process.
To achieve the above object, the present invention provides a process for manufacturing a bicycle crank, comprising the steps of: (a) providing a first handle part, a second handle part and a connecting piece, wherein the connecting piece is connected between the first handle part and the second handle part to form a base body; (b) providing a resin base material and a plurality of fiber tows, and stirring and mixing the resin base material and the plurality of fiber tows to form a coating base material; (c) providing a mold, placing the substrate and the covering substrate into the mold, heating and pressurizing to make the covering substrate flow after being heated and cover the substrate according to the shape in the mold, and heating and solidifying to form a composite crank.
In step (a), a fiber yarn is wound between the first handle portion, the connecting member and the second handle portion.
The base body defines an axial direction, and the fiber yarn is wound among the first handle part, the connecting piece and the second handle part along the axial direction.
The first handle portion and the second handle portion are respectively provided with a first group of connection holes and a second group of connection holes in a penetrating manner along the axial direction.
The fiber yarn is carbon fiber or glass fiber yarn.
The first handle part and the second handle part are made of metal materials, and the connecting piece is made of carbon fiber plates.
In step (c), the heating temperature of the mold is between 90 to 250 ℃, the mold comprises an upper mold and a lower mold, and the upper mold and the lower mold are attached to each other for heating and pressurizing.
In step (a), two ends of the connecting member are respectively provided with an arc-shaped section, and the two arc-shaped sections respectively abut against the outer peripheral walls of the first handle part and the second handle part.
One side of the second handle part facing the first handle part is provided with two spaced blocking parts, and one end of the connecting piece is limited between the two blocking parts.
In the step (b), the plurality of fiber tows are tows of carbon fibers or glass fibers, the lengths of the plurality of fiber tows are the same or different, and the coating substrate is in a liquid state or a clay state.
The invention has the beneficial effects that: the bicycle crank provided by the invention has the advantages of simple and quick manufacturing process, and the hot-pressing forming time only needs several minutes, so that the labor cost can be greatly reduced, the manufacturing process is quick, and the advantages of light weight, specific rigidity (rigidity/density), fatigue resistance, corrosion resistance and the like of the known attached carbon fiber crank are also realized.
Drawings
FIG. 1 is an exploded view of a base in accordance with a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of the substrate assembly according to a preferred embodiment of the present invention.
Fig. 3 to 4 are schematic views illustrating the operation and formation of the present invention.
Fig. 5 is an enlarged schematic view of a portion a of fig. 3.
FIG. 6 is a perspective view of the crank of the preferred embodiment of the present invention.
1: base 131: arc segment
2: coating the base material 111: first connecting hole
3: the mold 121: second assembling hole
4: fiber yarn 122: blocking part
9: composite material crank 21: resin base material
11: first handle portion 22: fibre tow
12: second handle portion 31: upper die
13: the connecting piece 32: lower die
Detailed Description
The following description is given by way of example only, and is not intended to limit the scope of the invention.
Referring to fig. 1 to 6, a bicycle crank manufacturing process according to a preferred embodiment of the present invention includes the following steps.
(a) A first handle portion 11, a second handle portion 12 and a connecting member 13 are provided, wherein the connecting member 13 is connected between the first handle portion 11 and the second handle portion 12 to form a base body 1.
(b) Providing a resin base material 21 and a plurality of fiber tows 22, stirring and mixing the resin base material 21 and the plurality of fiber tows 22 to form a coating base material 2, so that the plurality of fiber tows 22 are irregularly arranged and uniformly distributed on the resin base material 21. It should be noted that the fiber tows 22 are tows of carbon fibers or glass fibers, in the embodiment, the fiber tows 22 are tows of carbon fibers, the lengths of the fiber tows 22 are the same or different, the coated substrate 2 is in a liquid state or a clay state, in the embodiment, the coated substrate is in a different length, and in other embodiments, the coated substrate may also be in the same length.
(c) Providing a mold 3, placing the base 1 and the coated substrate 2 into the mold 3, heating and pressurizing to make the coated substrate 2 flow after being heated and coat the base 1 according to the shape in the mold 3, and heating and curing to form a composite crank 9. In the present embodiment, the heating temperature of the mold 3 ranges from 90 to 250 degrees celsius, the mold 3 includes an upper mold 31 and a lower mold 32, and the upper mold 31 and the lower mold 32 are attached to each other for performing the heating and pressing process.
In the embodiment, the first handle portion 11 and the second handle portion 12 are made of metal material so as to have high structural strength and not occupy too large a whole weight ratio to reduce the whole weight, and the connecting member 13 is made of carbon fiber plate material and preferably hollow material so as to reduce the whole weight. Therefore, the base body 1 can enable the inside of the formed composite crank 9 to have a structure body with a strong structure, so that the composite crank 9 has strong rigidity, and the coating base material 2 is coated outside the base body 1, and the plurality of fiber tows 22 which are irregularly arranged and uniformly distributed are arranged in the coating base material 2, so that the coating base material 2 still has the advantages of light weight, specific rigidity (rigidity/density), fatigue resistance, corrosion resistance and the like of the carbon fiber material.
In step (a), a fiber yarn 4 is wound between the first handle portion 11, the connecting member 13 and the second handle portion 12 to reinforce the connection strength of the substrate 1 and prevent the first handle portion 11 and the second handle portion 12 from shifting relative to the connecting member 13. In detail, the base body 1 defines an axial direction along which the fiber yarn 4 is wound among the first handle portion 11, the connecting member 13 and the second handle portion 12, i.e. the axial direction of the composite crank 9 formed and installed parallel to the pedals and the spindle of the bicycle.
Preferably, the first handle portion 11 and the second handle portion 12 are respectively provided with a first assembling hole 111 and a second assembling hole 121 along the axial direction, so as to respectively assemble the pedal and the spindle, without drilling after forming the composite crank 9, which is convenient in manufacturing. The fiber yarn 4 is a carbon fiber or glass fiber yarn, which is a carbon fiber yarn in this embodiment, so as to have the advantages of light weight and high strength.
In step (a), two ends of the connecting member 13 are respectively provided with an arc-shaped segment 131, and the two arc-shaped segments 131 respectively abut against the outer peripheral walls of the first handle portion 11 and the second handle portion 12, so as to prevent the connecting member 13 from sliding radially relative to the first handle portion 11 and the second handle portion 12. In addition, two spaced stopping portions 122 are disposed on one side of the second handle portion 12 facing the first handle portion 11, and one end of the connecting member 13 is limited between the two stopping portions 122 to prevent the connecting member 13 from sliding axially relative to the second handle portion 12.
In conclusion, the bicycle crank of the invention has simple and quick manufacturing process, the hot-pressing forming time only needs several minutes, compared with the existing attaching type carbon fiber crank, the invention has the advantages of greatly reducing the labor cost and quick manufacturing process, and also has the advantages of light weight, specific rigidity (rigidity/density), fatigue resistance, corrosion resistance and the like of the known attaching type carbon fiber crank.

Claims (10)

1. A manufacturing process of a bicycle crank is characterized in that: the method comprises the following steps:
(a) providing a first handle part, a second handle part and a connecting piece, wherein the connecting piece is connected between the first handle part and the second handle part to form a base body;
(b) providing a resin base material and a plurality of fiber tows, and stirring and mixing the resin base material and the plurality of fiber tows to form a coating base material;
(c) providing a mould, placing the base body and the coating base material into the mould, heating and pressurizing the mould, enabling the coating base material to flow after being heated so as to coat the base body according to the shape in the mould, and heating and solidifying the base body to form the composite material crank.
2. The bicycle crank process of claim 1, wherein: in step (a), a fiber yarn is wound between the first handle portion, the connecting member and the second handle portion.
3. The bicycle crank process of claim 2, wherein: the base body defines an axial direction, and the fiber yarn is wound among the first handle part, the connecting piece and the second handle part along the axial direction.
4. The bicycle crank process of claim 3, wherein: the first handle portion and the second handle portion are respectively provided with a first group of connection holes and a second group of connection holes in a penetrating manner along the axial direction.
5. The bicycle crank process of claim 2, wherein: the fiber yarn is carbon fiber or glass fiber yarn.
6. The bicycle crank process of claim 1, wherein: the first handle part and the second handle part are made of metal materials, and the connecting piece is made of carbon fiber plates.
7. The bicycle crank process of claim 1, wherein: in step (c), the heating temperature of the mold is between 90 to 250 ℃, the mold comprises an upper mold and a lower mold, and the upper mold and the lower mold are attached to each other for heating and pressurizing.
8. The bicycle crank process of claim 1, wherein: in step (a), two ends of the connecting member are respectively provided with an arc-shaped section, and the two arc-shaped sections respectively abut against the outer peripheral walls of the first handle part and the second handle part.
9. The bicycle crankset process of claim 8, wherein: one side of the second handle part facing the first handle part is provided with two spaced blocking parts, and one end of the connecting piece is limited between the two blocking parts.
10. The bicycle crank process of any one of claims 1 to 9, wherein: in the step (b), the plurality of fiber tows are tows of carbon fibers or glass fibers, the lengths of the plurality of fiber tows are the same or different, and the coating substrate is in a liquid state or a clay state.
CN201910748221.XA 2019-08-14 2019-08-14 Bicycle crank manufacturing process Pending CN112388992A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910748221.XA CN112388992A (en) 2019-08-14 2019-08-14 Bicycle crank manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910748221.XA CN112388992A (en) 2019-08-14 2019-08-14 Bicycle crank manufacturing process

Publications (1)

Publication Number Publication Date
CN112388992A true CN112388992A (en) 2021-02-23

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ID=74601298

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910748221.XA Pending CN112388992A (en) 2019-08-14 2019-08-14 Bicycle crank manufacturing process

Country Status (1)

Country Link
CN (1) CN112388992A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW495410B (en) * 1999-05-12 2002-07-21 Chin Shang Ind Co Ltd Method of fabricating bicycle cranks
US20030019325A1 (en) * 2001-06-27 2003-01-30 Campagnolo Srl Bicycle crank and method for manufacturing said crank
CN200995764Y (en) * 2007-01-12 2007-12-26 环航复合材料股份有限公司 Rib-structural crank of carbon-fibre composite material for bicycle
US20190061292A1 (en) * 2017-08-30 2019-02-28 TWDT Precision Co., Ltd. Method for making bicycle crank arm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW495410B (en) * 1999-05-12 2002-07-21 Chin Shang Ind Co Ltd Method of fabricating bicycle cranks
US20030019325A1 (en) * 2001-06-27 2003-01-30 Campagnolo Srl Bicycle crank and method for manufacturing said crank
CN200995764Y (en) * 2007-01-12 2007-12-26 环航复合材料股份有限公司 Rib-structural crank of carbon-fibre composite material for bicycle
US20190061292A1 (en) * 2017-08-30 2019-02-28 TWDT Precision Co., Ltd. Method for making bicycle crank arm

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Application publication date: 20210223

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