CN115157715A - Bicycle rim forming method - Google Patents
Bicycle rim forming method Download PDFInfo
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- CN115157715A CN115157715A CN202210799503.4A CN202210799503A CN115157715A CN 115157715 A CN115157715 A CN 115157715A CN 202210799503 A CN202210799503 A CN 202210799503A CN 115157715 A CN115157715 A CN 115157715A
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- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
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- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
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- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a bicycle rim forming method, which comprises the following steps: s1, prefabricating a plurality of groups of first-stage split shell molds, and paving a carbon fiber composite material on the inner sides of the first-stage split shell molds to form a prefabricated layer; s2, assembling and combining a plurality of groups of the primary split shell molds to form a preformed shell mold, tightly connecting and matching preformed layers on the inner sides of the groups of the primary split shell molds to form a rim preformed piece, and pre-placing a nylon air pipe in the rim preformed piece; s3, filling air into the nylon air pipe, and maintaining the pressure for a few seconds to enable the nylon air pipe to expand so that the preformed layer is tightly attached to the inner wall of the preformed cavity of the preformed shell mold; and S4, placing the preformed shell mold into a curing cavity of a curing mold, heating the curing mold, pressurizing the nylon air pipe, and simultaneously performing the heating process and the pressurizing process until the temperature and the pressure reach the curing molding requirements, and continuously maintaining the pressure until the rim preform is completely molded and cured to form the rim.
Description
Technical Field
The invention relates to the technical field of rims, in particular to a bicycle rim forming method.
Background
At present, the industry proposes to adopt carbon fiber material to make wheel hub, and carbon fiber "outer gentle internal stiffness", and the quality is lighter than metal aluminium, but intensity is higher than the steel, and under equal power, carbon fiber wheel hub's brake performance is more sensitive than aluminum alloy wheel hub, and the shock attenuation effect is better to physical stamina consumption is lower.
In the prior art, the forming of the carbon fiber bicycle rim usually needs to firstly manufacture an inner ring preform and an outer ring preform of the rim, then coat a carbon fiber composite material on the outside of the combination of the inner ring preform and the outer ring preform, and finally carry out curing forming in a curing mould on a forming table top, wherein the method has the disadvantages of complicated process and low efficiency, demoulding can be carried out by using a demoulding agent, and residual (redundant resin) is left in the metal curing mould after demoulding; and different rims have different structural requirements on the curing cavity of the metal curing mold, a plurality of metal molds need to be arranged, and the cost is high.
Disclosure of Invention
The invention provides a bicycle rim forming method for solving the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bicycle rim forming method comprises the following steps:
s1, prefabricating a plurality of groups of primary split shell molds, and paving a carbon fiber composite material on the inner sides of the primary split shell molds to form a prefabricated layer;
s2, assembling and combining a plurality of groups of the primary split shell molds to form a pre-molded shell mold, tightly connecting and matching pre-molded layers on the inner sides of the groups of the primary split shell molds to form a rim preform, and pre-placing a nylon air pipe in the rim preform;
s3, filling air into the nylon air pipe, and maintaining the pressure for a few seconds to enable the nylon air pipe to expand and support the preformed layer to be tightly attached to the inner wall of the preformed cavity of the preformed shell mold;
s4, placing the preformed shell mold into a curing cavity of a curing mold, heating the curing mold, pressurizing a nylon air pipe, and simultaneously performing the heating process and the pressurizing process until the temperature and the pressure reach the curing molding requirements, and continuously maintaining the pressure until the rim preform is completely molded and cured to form the rim;
s5, opening the curing mold, stripping the preformed shell mold from the surface of the rim, taking out the rim, and performing machining treatment to obtain a finished rim product.
Preferably, in step S1, a nail inserting hole communicated with the premoulding cavity is preset in the inner side of the premoulding shell mold, a spoke hole premoulding nail is detachably inserted in the nail inserting hole, the spoke hole premoulding nail penetrates through the premoulding layer to form a spoke premoulding hole, the top end of the spoke hole premoulding nail is hemispherical, and the spherical surface is tightly attached to the premoulding layer.
Preferably, the first-stage split shell mold comprises three groups, namely an upper shell mold, a lower shell mold and an outer ring shell mold, the inner sides of the upper shell mold and the lower shell mold are respectively provided with an upper nail inserting groove and a lower nail inserting groove, the upper nail inserting groove and the lower nail inserting groove are matched to form the nail inserting hole, and the pre-molding layer comprises four groups, namely an upper pre-molding layer, a lower pre-molding layer, an outer ring pre-molding layer and an inner ring pre-molding layer.
Preferably, the assembling process of the upper shell mold, the lower shell mold and the outer ring shell mold is as follows:
respectively paving an upper pre-molding layer, a lower pre-molding layer and an outer ring pre-molding layer on the inner sides of the upper shell mold, the lower shell mold and the outer ring shell mold;
placing the outer ring shell mold and the inner ring pre-molded layer on two ends of the inner side of the lower shell mold respectively for splicing and combining, and penetrating spoke pre-molded holes in the inner ring pre-molded layer through spoke hole pre-molded nails;
nylon air pipes are arranged among the lower prefabricated layer, the outer ring prefabricated layer and the inner ring prefabricated layer;
and assembling and combining the upper shell mold, the lower shell mold and the outer ring shell mold to form a pre-molded shell mold.
Preferably, adjacent two sets of all can disassemble the concatenation through the block structure between the one-level components of a whole that can function independently shell mould, the block structure includes buckle and bayonet socket.
Preferably, the first-stage split shell mold comprises a plurality of groups of second-stage split shell molds which are circumferentially connected in a surrounding manner.
Preferably, the premoulded shell mould is made of a plastic material, and the curing mould is made of a metal material.
Preferably, the curing temperature of the rim preform is 145-155 ℃, and the curing pressure is 1.5-1.8 MPa.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the invention provides a bicycle rim forming method, wherein a pre-forming layer of carbon fiber composite material is laid on the inner side of each first-stage split shell mold, then each first-stage split shell mold is assembled and combined to form a pre-forming shell mold, then the pre-forming shell mold is placed in a curing mold for curing and forming, a pre-forming cavity structure of the pre-forming shell mold is matched with a rim structure, when the carbon fiber composite material is laid, the carbon fiber composite material is laid layer by layer from outside to inside, local areas needing to be reinforced in the interior can be directly reinforced, the integral strength of the rim is ensured, the surface of the rim is smooth and flat, the surface treatment process after the subsequent rim forming is omitted, and the labor cost is saved.
2. The invention provides a bicycle rim forming method, which is convenient to demould, can take out a pre-formed shell mould without a demoulding agent, directly peels the pre-formed shell mould made of a plastic material from the surface of a rim formed by curing, can be continuously used without residues in the curing mould, is not required to clean the mould after being used for a long time, is simple and convenient to operate, is not easy to damage the rim, simplifies a generation process compared with the traditional process mode, shortens the process time and reduces the production cost of an enterprise.
3. The invention provides a bicycle rim forming method, which can adjust the internal structure of a pre-formed shell mold according to the actual rim requirement, the curing mold can be a universal mold, and compared with the structure of a curing mold made of a metal material, the cost and difficulty for adjusting the pre-formed shell mold made of a plastic material are lower, and the production cost of an enterprise is saved.
4. The invention provides a bicycle rim forming method, wherein a nail inserting hole communicated with a pre-forming cavity is preset at the inner side position of a pre-forming shell mold, a spoke hole pre-forming nail is detachably inserted in the nail inserting hole, a spoke hole pre-forming hole for the spoke hole pre-forming nail to pass through is reserved when a pre-forming layer is laid on the inner wall of the pre-forming cavity, and the spoke hole pre-forming nail is withdrawn after a rim is cured and formed. Spoke hole and rim integrated into one piece compare the tradition and punch at the destructiveness that the shaping rim processed, the angle accuracy in spoke hole is high, and intensity is good, and the carbon fiber rim intensity of making is high, the stable performance, spoke hole and rim integrated into one piece's mode has retrencied production technology, has shortened process time, has reduced enterprise manufacturing cost.
Drawings
FIG. 1 is a schematic view of a molding process of the present invention;
FIG. 2 is a schematic view of the disassembled preformed shell of the present invention;
FIG. 3 is a schematic view of the assembled state of the preformed mold shell of the present invention;
FIG. 4 is a schematic view of the structure of the premolded shell mold according to the invention;
FIG. 5 is a schematic view of the disassembled state of the premold mold of the present invention;
FIG. 6 is a schematic view of the upper shell mold structure of the present invention;
FIG. 7 is a schematic view of the lower housing mold structure of the present invention;
FIG. 8 is a schematic view of the outer race shell mold structure of the present invention;
FIG. 9 is a schematic view of a curing mold according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Examples
With reference to fig. 1 to 9, the invention discloses a bicycle rim forming method, which comprises the following steps:
s1, prefabricating a plurality of groups of primary split shell molds, and paving a carbon fiber composite material on the inner sides of the primary split shell molds to form a pre-molding layer, wherein the pre-molding layer comprises a plurality of layers;
s2, assembling and combining a plurality of groups of primary split shell molds to form a preformed shell mold, tightly connecting and matching preformed layers on the inner sides of the groups of primary split shell molds to form a rim preformed piece, and pre-placing a nylon air pipe in the rim preformed piece;
s3, filling air into the nylon air pipe, and maintaining the pressure for a few seconds to enable the nylon air pipe to expand and support the pre-molding layer to be closely attached to the inner wall of the pre-molding cavity of the pre-molding shell mold;
s4, placing the preformed shell mold into a curing cavity of a curing mold, heating the curing mold, and pressurizing a nylon air pipe at the same time, wherein the heating process and the pressurizing process are carried out simultaneously until the temperature and the pressure reach 145-155 ℃, and the pressure reaches 1.5-1.8 MPa, until the rim preform is completely molded and cured to form a rim;
and S5, opening the curing mold, stripping the preformed shell mold from the surface of the rim, taking out the rim, and performing machining treatment to obtain a finished rim product.
In the step S1, inserting nail holes communicated with the preforming cavity are preset in the inner side of the preforming shell mold, spoke hole preforming nails are detachably inserted in the inserting nail holes and penetrate through the preforming layer to form spoke preforming, the top ends of the spoke hole preforming nails are hemispherical, and spherical surfaces are tightly attached to the preforming layer, so that the angles of the spoke preforming holes can be accurately adjusted according to the angles of the penetrating spoke hole preforming nails.
All can disassemble the concatenation through the block structure between the adjacent two sets of one-level components of a whole that can function independently shell mould, and the block structure includes buckle and bayonet socket, thereby fixes the concatenation with adjacent two sets of one-level components of a whole that can function independently shell mould in inserting the bayonet socket to carry out the joint fixed through the buckle.
The first-stage split shell mold comprises a plurality of groups of second-stage split shell molds which are circumferentially connected in a surrounding manner, the second-stage split shell molds can be a group or a plurality of groups, the adjustment and the setting can be specifically carried out according to the actual requirements and the convenience of assembling and combining, and all the second-stage split shell molds are also detachably connected through buckles and bayonets.
The premoulded shell mould is also provided with a mounting hole which runs through the inner side and the outer side of the premoulded shell mould and is used for mounting an air nozzle accessory of a tire, and the end part of the nylon air pipe is led out from the mounting hole and is connected with the air nozzle accessory.
The pre-molded shell mold is made of plastic, and the curing mold is made of metal.
As shown in fig. 2 to 9, in the present embodiment, the first-stage split shell mold 1 includes three groups, which are an upper shell mold 11, a lower shell mold 12, and an outer ring shell mold 13, the inner sides of the upper shell mold 11 and the lower shell mold 12 are respectively provided with an upper nail insertion groove 111 and a lower nail insertion groove 121, the upper nail insertion groove 111 and the lower nail insertion groove 121 cooperate to form a nail insertion hole 14 for a spoke hole pre-molding nail 3 to pass through, and the pre-molding layer 2 includes four groups, which are an upper pre-molding layer 21, a lower pre-molding layer 22, an outer ring pre-molding layer 23, and an inner ring pre-molding layer 24.
The assembling process of the upper shell mold 11, the lower shell mold 12 and the outer ring shell mold 13 is as follows:
1) Respectively paving an upper pre-molding layer 21, a lower pre-molding layer 22 and an outer ring pre-molding layer 23 on the inner sides of the upper shell mold 11, the lower shell mold 12 and the outer ring shell mold 13;
2) Placing the outer ring shell mold 13 and the inner ring pre-molded layer 24 respectively at two ends of the inner side of the lower shell mold 12 for splicing and combining, and penetrating spoke pre-molded holes 241 in the inner ring pre-molded layer 24 through spoke hole pre-molded nails 3;
the inner ring pre-formed layer 24 is pre-paved and formed through an external pre-forming jig, then spoke hole pre-forming holes 241 are inserted on the inner ring pre-formed layer 24 according to the angle requirement of spoke holes of the rim through spoke hole pre-forming nails 4 according to the angle, the paved and formed inner ring pre-formed layer 24 is placed on the lower shell mold 12 to be combined, and the spoke pre-forming needles 3 are placed in the lower nail inserting grooves 111.
The outer hole is opened through drilling equipment outside the rim after the shaping, and spoke hole preformed nail 3 can be followed the outer hole and taken out, and the outer hole punches only need unified angle and diameter just can, need not like the spoke hole need according to the angle of its different positions accurate adjustment that punches, and the technology degree of difficulty and technology cost are lower.
3) A nylon air pipe 4 is arranged among the lower prefabricated layer 22, the outer ring prefabricated layer 23 and the inner ring prefabricated layer 24;
4) The upper shell mold 11, the lower shell mold 12 and the outer ring shell mold 13 are assembled and combined to form the pre-molded shell mold 1.
The upper pre-forming layer 21 and the lower pre-forming layer 22 are gradually thinned close to the inner ring pre-forming layer 24 in the laying process, so that the inner ring pre-forming layer 24 is smoothly and tightly connected with the upper pre-forming layer 21 and the lower pre-forming layer 21, the outer ring pre-forming layer 23 extends to two sides in the laying process, the outer ring pre-forming layer 23 is conveniently and smoothly and tightly connected with the upper pre-forming layer 21 and the lower pre-forming layer 22, and the strength of the formed rim at the joint is ensured. Meanwhile, in the laying process of the pre-formed layer 2, local positions, such as a brake position and a spoke hole position, are thickened and laid for local reinforcement.
The curing mold 5 comprises an upper curing mold 51, a lower curing mold 52 and a side slide block 53, the upper curing mold 51 is arranged right above the lower curing mold 52 in a lifting manner, an upper curing groove and an upper slide block accommodating groove communicated with the upper curing groove are formed in the bottom side of the upper curing mold 51, a lower curing groove and a lower slide block accommodating groove communicated with the lower curing groove are formed in the top side of the lower curing mold 52, the upper curing groove and the lower curing groove are matched to form a curing cavity 54 for accommodating the split shell mold 1, the curing cavity 11 is matched with the structure of the pre-molded shell mold, the upper slide block accommodating groove and the lower slide block accommodating groove are matched to form a slide block accommodating cavity 55 for accommodating the side slide block 53, and a convex layer 531 matched with the outer side of the outer ring pre-molded layer 23 is arranged on the inner side of the side slide block 53 and used for being clamped into the outer side of the outer ring pre-molded layer 23.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A bicycle rim forming method is characterized in that: the method comprises the following steps:
s1, prefabricating a plurality of groups of first-stage split shell molds, and paving a carbon fiber composite material on the inner sides of the first-stage split shell molds to form a prefabricated layer;
s2, assembling and combining a plurality of groups of the primary split shell molds to form a pre-molded shell mold, tightly connecting and matching pre-molded layers on the inner sides of the groups of the primary split shell molds to form a rim preform, and pre-placing a nylon air pipe in the rim preform;
s3, filling air into the nylon air pipe, and maintaining the pressure for a few seconds to enable the nylon air pipe to expand and support the preformed layer to be tightly attached to the inner wall of the preformed cavity of the preformed shell mold;
s4, placing the preformed shell mold into a curing cavity of a curing mold, heating the curing mold, pressurizing a nylon air pipe, and simultaneously performing the heating process and the pressurizing process until the temperature and the pressure reach the curing molding requirements, and continuously maintaining the pressure until the rim preform is completely molded and cured to form the rim;
s5, opening the curing mold, stripping the preformed shell mold from the surface of the rim, taking out the rim, and performing machining treatment to obtain a finished rim product.
2. A method of forming a bicycle rim as defined in claim 1, wherein: in the step S1, inserting nail holes communicated with the premolding cavity are preset in the inner side of the premolding shell mold, spoke hole premolding nails are detachably inserted in the inserting nail holes and penetrate through the premolding layer to form spoke premolding holes, the top ends of the spoke hole premolding nails are hemispherical, and the spherical surfaces of the spoke hole premolding nails are tightly attached to the premolding layer.
3. A method of forming a bicycle rim as defined in claim 2, wherein: the one-stage split shell mold comprises three groups of upper shell molds, lower shell molds and outer ring shell molds, wherein the inner sides of the upper shell molds and the lower shell molds are respectively provided with an upper nail inserting groove and a lower nail inserting groove, the upper nail inserting grooves and the lower nail inserting grooves are matched to form the nail inserting holes, and the pre-molding layer comprises four groups of upper pre-molding layers, lower pre-molding layers, outer ring pre-molding layers and inner ring pre-molding layers.
4. A method of forming a bicycle rim as defined in claim 3, wherein: the assembling process of the upper shell mold, the lower shell mold and the outer ring shell mold is as follows:
respectively paving an upper pre-molding layer, a lower pre-molding layer and an outer ring pre-molding layer on the inner sides of the upper shell mold, the lower shell mold and the outer ring shell mold;
placing the outer ring shell mold and the inner ring pre-molding layer on two ends of the inner side of the lower shell mold respectively for assembling and combining, and penetrating spoke pre-molding holes in the inner ring pre-molding layer through spoke hole pre-molding nails;
nylon air pipes are arranged among the lower prefabricated layer, the outer ring prefabricated layer and the inner ring prefabricated layer;
and assembling and combining the upper shell mold, the lower shell mold and the outer ring shell mold to form a pre-molded shell mold.
5. A method of forming a bicycle rim as defined in claim 1, wherein: adjacent two sets of all can disassemble the concatenation through the block structure between the one-level components of a whole that can function independently shell mould, the block structure includes buckle and bayonet socket.
6. A method of forming a bicycle rim as claimed in claim 1, wherein: the first-stage split shell mold comprises a plurality of groups of second-stage split shell molds which are circumferentially connected in a surrounding manner.
7. A method of forming a bicycle rim as defined in claim 1, wherein: the pre-molded shell mold is made of a plastic material, and the curing mold is made of a metal material.
8. A method of forming a bicycle rim as defined in claim 1, wherein: the curing temperature of the rim preform is 145-155 ℃, and the curing pressure is 1.5-1.8 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210799503.4A CN115157715A (en) | 2022-07-06 | 2022-07-06 | Bicycle rim forming method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210799503.4A CN115157715A (en) | 2022-07-06 | 2022-07-06 | Bicycle rim forming method |
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| CN111660587A (en) * | 2019-03-08 | 2020-09-15 | 厦门鸿基伟业复材科技有限公司 | Carbon fiber rim with barbs, forming die and preforming process thereof |
| CN112277336A (en) * | 2020-09-27 | 2021-01-29 | 厦门佰业兴户外用品有限公司 | Preforming jig, forming die and forming method for carbon fiber bicycle rim |
| CN112622117A (en) * | 2020-12-01 | 2021-04-09 | 常州启赋安泰复合材料科技有限公司 | Forming die for paving and pasting unidirectional prepreg and using method thereof |
| JP7019226B1 (en) * | 2021-08-05 | 2022-02-15 | 有限会社内山製陶所 | Case type |
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