CN112935217A - Magnesium alloy bicycle frame integral forming core-pulling process - Google Patents
Magnesium alloy bicycle frame integral forming core-pulling process Download PDFInfo
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- CN112935217A CN112935217A CN202110119898.4A CN202110119898A CN112935217A CN 112935217 A CN112935217 A CN 112935217A CN 202110119898 A CN202110119898 A CN 202110119898A CN 112935217 A CN112935217 A CN 112935217A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 29
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 9
- 239000011777 magnesium Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000003466 welding Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000004512 die casting Methods 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a core pulling process for integrally forming a magnesium alloy bicycle frame, which comprises the following steps of: step 1, melting magnesium ingots in a quantitative furnace and stirring to form magnesium alloy liquid and preserving heat; step 2, the head pipe mold core, the upper pipe mold core, the lower pipe mold core, the five-way mold core and the middle pipe mold core extend into the mold, and the mold is closed; step 3, preheating the die until the die temperature reaches 165-195 ℃; step 4, injecting the magnesium alloy liquid into the die at a low speed, and then quickly injecting the magnesium alloy liquid to solidify the magnesium alloy liquid to form an integrally formed frame; and 5, opening the mold, extracting each core in the step 2, and taking out the integrally formed frame, wherein the core-pulling speed is 0.1-0.15 m/s. The magnesium alloy frame is integrally formed through magnesium alloy die casting, the production automation degree is high, the production efficiency is effectively improved, the frame forming quality is good, welding is not needed, the labor cost is saved, the core pulling is carried out on the upper pipe and the lower pipe, the frame weight is reduced, the material cost is saved, and the economic benefit of an enterprise is favorably improved.
Description
Technical Field
The invention relates to the technical field of bicycle frame manufacturing processes, in particular to a core-pulling process for integrally forming a magnesium alloy bicycle frame.
Background
The bicycle frame mainly comprises a head tube, an upper tube, a lower tube, a middle tube, an upper fork and a lower fork, wherein two ends of the upper tube and the lower tube are respectively connected with the head tube and the middle tube to form a front bracket, one end of the upper fork is connected with one end of the lower fork, the other ends of the upper fork and the lower fork are both connected with the middle tube to form a rear bracket, two upper forks and two lower forks are arranged, to form two rear supports, the joints of the middle pipe, the lower pipe and the lower fork are provided with five through holes, the traditional process is that the head pipe, the upper pipe, the lower pipe, the middle shaft seat, the upper fork and the lower fork are respectively formed and then are connected and formed by welding, the manufacturing process has complicated steps and low efficiency, but has very high requirement on welding quality, and when the strength of a welding part is insufficient, the frame is easy to break, the technical level of welders directly influences the welding quality, the technical super-high experienced welders often require higher wages, and the labor cost of a factory is increased.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides an integral forming core-pulling process for a magnesium alloy bicycle frame, which can be used for manufacturing an integral die-cast frame, and has the advantages of good forming quality, light product weight, high automation degree of a production process and labor cost saving.
The magnesium alloy bicycle frame integral forming core-pulling process provided by the embodiment of the invention comprises the following steps of: step 1, baking a magnesium ingot in a furnace platform of a quantitative furnace, after baking for 15-30 minutes, putting the magnesium ingot into the quantitative furnace, smelting and stirring to form magnesium alloy liquid and preserving heat; step 2, a head pipe core, an upper pipe core, a lower pipe core, a five-way core and a middle pipe core extend into a mold and are respectively used for molding a head pipe, an upper pipe, a lower pipe, a five-way hole and a middle pipe of the frame, and the mold is closed; step 3, preheating the die until the die temperature reaches 165-195 ℃; step 4, firstly, injecting the magnesium alloy liquid into the die at a low speed until the die temperature reaches 230-270 ℃, and then quickly injecting the magnesium alloy liquid to solidify the magnesium alloy liquid to form an integrally formed frame; and 5, opening the mold, respectively drawing out the head tube core, the five-way core, the middle tube core, the upper tube core and the lower tube core, and taking out the integrally formed frame after core pulling, wherein the core pulling speed is 0.1-0.15 m/s.
The magnesium alloy bicycle frame integral forming core-pulling process provided by the embodiment of the invention at least has the following technical effects: obtain integrated into one piece's bicycle frame through magnesium alloy die-casting, production degree of automation is high, effectively improves production efficiency, and the shaping is of high quality, need not the welding, and is safe pleasing to the eye, practices thrift the cost of labor to loose core to top tube and low tube, on the basis of proof strength, alleviate frame weight, material saving cost is favorable to improving enterprise economic benefits.
According to some embodiments of the invention, in step 5, the upper pipe core is extracted along a length direction of an upper pipe, and the lower pipe core is extracted along a length direction of a lower pipe.
According to some embodiments of the invention, the head pipe core comprises a first parting core and a second parting core, one end of the first parting core is provided with a concave position and a first slot position, one end of the second parting core is provided with a bulge and a second slot position, the bulge is inserted into the concave position, the first slot position and the second slot position are jointed to form a slot position spigot, and one end of the lower pipe core is inserted into the slot position spigot.
According to some embodiments of the present invention, the five-way core includes a third divided core and a fourth divided core, the third divided core and the fourth divided core are respectively engaged with left and right sides of the lower pipe core, and a lower end of the middle pipe core is engaged with an upper side of the lower pipe core.
According to some embodiments of the invention, in step 5, the upper pipe core is extracted perpendicularly to a length direction of an upper pipe, and the lower pipe core is extracted perpendicularly to a length direction of a lower pipe.
According to some embodiments of the invention, a plurality of grooves are arranged on the upper tube core or/and the lower tube core along the core pulling direction, and the grooves are used for forming the reinforcing ribs.
According to some embodiments of the invention, the wall thickness of the upper tube and the lower tube is 2mm to 35mm, the height dimension of the reinforcing rib is 0.8 times or more of the wall thickness, and the width dimension of the reinforcing rib is 0.5 times or more of the wall thickness.
According to some embodiments of the invention, in the step 3, the mold is baked by moving a flame gun back and forth, wherein the moving speed of the flame gun is 0.3m/s to 0.7 m/s.
According to some embodiments of the invention, in the step 4, the pressure of the magnesium alloy liquid rapid injection is 120 bar-200 bar, the injection time is 3 s-10 s, and the cooling time is 3 s-8 s.
According to some embodiments of the invention, in the step 4, the pressure of the magnesium alloy liquid during low-speed injection is 80 bar-160 bar, the injection time is 3 s-10 s, and the cooling time is 3 s-8 s.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a front view of a bicycle frame according to a first embodiment of the present invention;
FIG. 2 is a right side elevational view of the bicycle frame illustrated in FIG. 1;
FIG. 3 is a schematic view of the mating structure of the head tube core and the down tube core of the bicycle frame illustrated in FIG. 1;
FIG. 4 is a schematic view of a reinforcement bar structure of the bicycle frame illustrated in FIG. 1;
FIG. 5 is a schematic structural view of a bicycle frame according to a second embodiment of the present invention;
FIG. 6 is a schematic view of the down tube structure of the bicycle frame illustrated in FIG. 5.
Reference numerals:
An upper tube core 200, a lower tube core 210, a groove 220,
A head tube core 300, a first parting core 310, a concave position 311, a first slot position 312, a second parting core 320, a convex portion 321, a second slot position 322,
A five-way mold core 400, a third parting core 410 and a fourth parting core 420;
a middle tube core 500.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The following describes a core-pulling process for integrally molding a magnesium alloy bicycle frame according to an embodiment of the invention with reference to fig. 1 to 5.
Example one
As shown in fig. 1 and 2, the core pulling process for integrally forming a magnesium alloy bicycle frame according to the first embodiment of the invention includes the following steps:
step 1, placing a magnesium ingot on a furnace platform of a quantitative furnace, baking and preheating, after baking for 15-30 minutes, putting the magnesium ingot into the quantitative furnace, smelting and stirring to form magnesium alloy liquid, and keeping the temperature;
step 2, a head tube core 300, an upper tube core 200, a lower tube core 210, a five-way core 400 and a middle tube core 500 are arranged on the mold and are respectively used for forming a head tube 130, an upper tube 110, a lower tube 120, a five-way hole 170 and a middle tube 140 of the frame 100, the cores are respectively controlled by cylinders to extend into the mold, and the mold is closed;
step 3, preheating a mold to enable the mold temperature to reach 165-195 ℃;
step 4, injecting the magnesium alloy liquid into the die at a low speed until the die temperature reaches 230-270 ℃, and then quickly injecting the magnesium alloy liquid to solidify the magnesium alloy liquid to form the integrally formed frame 100;
and 5, opening the mold, respectively drawing out the head tube core 300, the five-way core 400, the middle tube core 500, the upper tube core 200 and the lower tube core 210 under the control of the cylinder, wherein the core pulling speed is 0.1-0.15 m/s, simultaneously opening the mold, and taking out the integrally formed frame 100 after core pulling.
Specifically, when the core is pulled, the head tube core 300 is firstly pulled out, the five-way core 400 and the middle tube core 500 are then pulled out simultaneously, and the upper tube core 200 and the lower tube core are finally pulled out simultaneously, so that the core pulling sequence can effectively avoid core pulling interference, and the core pulling reliability is ensured.
It can be understood that the magnesium alloy has small density, lighter weight than the aluminum alloy under the condition of the same volume, high strength, good shock absorption and larger impact load bearing capacity than the aluminum alloy, and is a material with development prospect in the bicycle industry. Because the existing metal bicycle frame 100 adopts a welding mode, two ends of an upper pipe and a lower pipe are respectively connected with the head pipe and the middle pipe to form a triangular front support, and meanwhile, the middle pipe is connected with two upper forks 150 and a lower fork 160 to form two triangular rear supports, the positions needing to be welded are more, the production process steps are complicated, the production efficiency is not high, the welding quality directly influences the overall strength and the aesthetic property of the bicycle frame 100, the technical and experience requirements of welders are very high, the difficulty of engaging excellent welders is high, the needed salary is high, the labor cost of enterprises is increased, therefore, the integrally formed bicycle frame 100 is obtained through magnesium alloy die casting, the production automation degree is high, the production efficiency is effectively improved, the forming quality is good, the welding is not needed, the strength is high, the safety performance is good, the appearance is attractive, the labor cost is saved, and the core pulling is carried out on the upper pipe 110 and the lower pipe 120, on the basis of ensuring the strength, the weight of the frame 100 is reduced, the material cost is saved, and the economic benefit of enterprises is improved.
In the step 1, the magnesium ingot used for baking is required to be a neat and clean brand-new pure magnesium ingot without obvious water dripping, so that the purity of the molten metal is ensured.
Further, in the step 3, the preheating mould adopts a flame gun to move back and forth to bake the mould, the moving speed of the flame gun is 0.3 m/s-0.7 m/s, and in order to give consideration to preheating efficiency and preheating uniformity, the moving speed of 0.5m/s can be adopted.
Further, in the step 4, the pressure of the magnesium alloy liquid for rapid injection is 120 bar-200 bar, the injection time is 3 s-10 s, and the cooling time is 3 s-8 s. Furthermore, the pressure of the magnesium alloy liquid in low-speed injection is 80-160 bar, the injection time is 3-10 s, and the cooling time is 3-8 s.
Specifically, after the magnesium alloy liquid is stirred, the magnesium alloy liquid is pumped into a pressure chamber of a die casting machine through a liquid pumping machine and is injected within 1s, the temperature of the die is 165-195 ℃, the liquid temperature of the magnesium alloy liquid is 665-695 ℃, in order to ensure the forming quality of the magnesium alloy liquid and reduce product cracks, the magnesium alloy liquid is injected into the die through low-speed injection, the injection pressure is 80-160 bar, the injection time is 3-10 s, the cooling time is 3-8 s, when the die temperature reaches 230-270 ℃, namely the die temperature reaches the normal working temperature, the high-speed injection is adopted, namely a normal die-casting injection mode, the injection pressure is 120-200 bar, the injection time is 3-10 s, and the cooling time is 3-8 s.
It should be noted that in actual production, the shot parameters of the low-speed shot, including the pressure, shot time and cooling time, can be adjusted according to actual needs.
In some embodiments of the invention, as shown in fig. 1, in step 5, the upper tube core 200 is withdrawn along the length of the upper tube 110 and the lower tube core 210 is withdrawn along the length of the lower tube 120. By adopting the core pulling method, the upper tube 110 and the lower tube 120 with hollow structures can be formed, and accessories such as wiring can be stored in the upper tube 110 and the lower tube 120, so that the appearance attractiveness of the bicycle is further improved.
In actual production, both the upper tube core 200 and the lower tube core 210 may be drawn out from the direction of the middle tube 140 toward the direction of the head tube 130, or may be drawn out from the direction of the head tube 130 toward the direction of the middle tube 140.
As shown in fig. 1 and 3, the head pipe core 300 includes a first split core 310 and a second split core 320, wherein one end of the first split core 310 is provided with a concave portion 311 and a first slot portion 312, one end of the second split core 320 is provided with a protrusion 321 and a second slot portion 322, the protrusion 321 is inserted into the concave portion 311, the first slot portion 312 and the second slot portion 322 are engaged to form a slot stop, and one end of the lower pipe core 210 is inserted into the slot stop.
Further, as shown in fig. 1 to 3, the five-way core 400 includes a third divided core 410 and a fourth divided core 420, the third divided core 410 and the fourth divided core 420 are respectively engaged with left and right sides of the down tube core 210, and a lower end of the middle tube core 500 is engaged with an upper side of the down tube core 210.
It will be appreciated that the parting plane is arranged on the plane of the front frame, the third split core 410 and the fourth split core 420 are arranged on the moving mold and the fixed mold of the mold, respectively, and after the lower pipe core 210 is inserted into the mold, when the mold is closed, the third split core 410 and the fourth split core 420 are respectively attached to both sides of the down tube core 210, and after the first split core 310 and the second split core 320 are positioned by the protrusion 321 and the recess 311, and then the lower pipe core 210 is positioned by connecting the slot position spigot with one end of the lower pipe core 210, so as to avoid the lower pipe core 210 from vibrating due to the impact force generated when the magnesium alloy is injected, ensure the uniform wall thickness of the lower pipe 120, after the frame 100 is molded, the third split core 410 and the fourth split core 420 are withdrawn as the movable mold and the fixed mold are separated, the five through holes 170 are formed, and then the lower pipe core 210 is drawn out, so that the phenomenon that the surface of the core is scratched due to friction between the lower pipe core 210 and the five-way core 400 is avoided.
As shown in fig. 4, in some embodiments of the present invention, a plurality of grooves 220 are formed on the upper tube core 200 or/and the lower tube core 210 along the core pulling direction, and the grooves 220 are used for molding the reinforcing ribs 180. Further, the wall thickness of the upper tube 110 and the lower tube 120 is 2mm to 35mm, the height of the reinforcing rib 180 is 0.8 times or more of the wall thickness, and the width of the reinforcing rib 180 is 0.5 times or more of the wall thickness.
It can be understood that, through the recess 220 that sets up the core, can form strengthening rib 180 along the direction of loosing core in the inside of upper tube 110 or lower tube 120, increase frame 100 intensity, improve crashworthiness and security, when setting up strengthening rib 180, can be according to actual need, only set up in upper tube 110, also can only set up in lower tube 120, or set up strengthening rib 180 in upper tube 110 and lower tube 120 simultaneously, the wall thickness after upper tube 110 and lower tube 120 loose core is 2mm ~ 35mm, wall thickness size confirms the back, the height dimension more than or equal to 0.8 times of wall thickness of its strengthening rib that corresponds, width dimension more than or equal to 0.5 times of wall thickness, the wall thickness is selected according to actual need, the pattern of strengthening rib 180, the strip number and distribution mode also can be adjusted according to actual need.
Example two
As shown in fig. 5 and 6, in step 5 of the second embodiment, compared to the first embodiment, the upper tube core 200 is drawn out perpendicularly to the longitudinal direction of the upper tube 110, and the lower tube core 210 is drawn out perpendicularly to the longitudinal direction of the lower tube 120.
It can be appreciated that, in actual use, a plastic cover plate can be disposed on the upper tube 110 and the lower tube 120 to cover the internal reinforcing ribs 180, which is beneficial to reduce the weight of the frame 100 and improve the aesthetic appearance.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. An integrally-formed core-pulling process for a magnesium alloy bicycle frame is characterized by comprising the following steps of:
step 1, baking a magnesium ingot in a furnace platform of a quantitative furnace, after baking for 15-30 minutes, putting the magnesium ingot into the quantitative furnace, smelting and stirring to form magnesium alloy liquid and preserving heat;
step 2, a head pipe core, an upper pipe core, a lower pipe core, a five-way core and a middle pipe core extend into a mold and are respectively used for molding a head pipe, an upper pipe, a lower pipe, a five-way hole and a middle pipe of the frame, and the mold is closed;
step 3, preheating the die until the die temperature reaches 165-195 ℃;
step 4, firstly, injecting the magnesium alloy liquid into the die at a low speed until the die temperature reaches 230-270 ℃, and then quickly injecting the magnesium alloy liquid to solidify the magnesium alloy liquid to form an integrally formed frame;
and 5, opening the mold, respectively drawing out the head tube core, the five-way core, the middle tube core, the upper tube core and the lower tube core, and taking out the integrally formed frame after core pulling, wherein the core pulling speed is 0.1-0.15 m/s.
2. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 1, characterized in that: in the step 5, the upper pipe core is drawn out along the length direction of the upper pipe, and the lower pipe core is drawn out along the length direction of the lower pipe.
3. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 2, characterized in that: the head tube core comprises a first parting core and a second parting core, wherein one end of the first parting core is provided with a concave position and a first slot position, one end of the second parting core is provided with a protrusion and a second slot position, the protrusion is inserted into the concave position, the first slot position and the second slot position are connected to form a slot position spigot, and one end of the lower tube core is inserted into the slot position spigot.
4. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 2, characterized in that: the five-way core comprises a third split core and a fourth split core, the third split core and the fourth split core are respectively jointed with the left side and the right side of the lower pipe core, and the lower end of the middle pipe core is jointed with the upper side of the lower pipe core.
5. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 1, characterized in that: in the step 5, the upper pipe core is drawn out in a direction perpendicular to the length direction of the upper pipe, and the lower pipe core is drawn out in a direction perpendicular to the length direction of the lower pipe.
6. The magnesium alloy bicycle frame integral molding core-pulling process according to any one of claims 2 or 5, characterized in that: and the upper pipe core or/and the lower pipe core are/is provided with a plurality of grooves along the core-pulling direction, and the grooves are used for forming reinforcing ribs.
7. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 6, characterized in that: the wall thickness of the upper pipe and the lower pipe is 2 mm-35 mm, the height size of the reinforcing rib is more than or equal to 0.8 time of the wall thickness, and the width size of the reinforcing rib is more than or equal to 0.5 time of the wall thickness.
8. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 1, characterized in that: and in the step 3, a flame gun is adopted to move back and forth to bake the die, and the moving speed of the flame gun is 0.3-0.7 m/s.
9. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 1, characterized in that: in the step 4, the pressure of the magnesium alloy liquid for rapid injection is 120-200 bar, the injection time is 3-10 s, and the cooling time is 3-8 s.
10. The magnesium alloy bicycle frame integrally-forming core-pulling process according to claim 1, characterized in that: in the step 4, the pressure of the magnesium alloy liquid during low-speed injection is 80-160 bar, the injection time is 3-10 s, and the cooling time is 3-8 s.
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| CN202110119898.4A CN112935217A (en) | 2021-01-28 | 2021-01-28 | Magnesium alloy bicycle frame integral forming core-pulling process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309487A (en) * | 2022-01-12 | 2022-04-12 | 鼎镁新材料科技股份有限公司 | Bicycle frame integrated casting internal mold structure with hollow structure and forming preparation method |
| CN117862462A (en) * | 2024-03-11 | 2024-04-12 | 江苏中鑫车业有限公司 | Integrated machining and forming device and process for electric vehicle frame |
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| EP1792674A1 (en) * | 2005-11-30 | 2007-06-06 | HONDA MOTOR CO., Ltd. | Vehicle body frame, die-cast product, mold for die-cast product and die-cast method |
| CN103523129A (en) * | 2013-10-29 | 2014-01-22 | 天津金轮自行车集团有限公司 | Unitized bicycle frame free of welding joints |
| CN103537644A (en) * | 2013-10-29 | 2014-01-29 | 天津金轮自行车集团有限公司 | Aluminum alloy bicycle frame integral forming production method and mould for achieving same |
| CN104192249A (en) * | 2014-07-31 | 2014-12-10 | 芜湖富仕达机械有限公司 | Tube plate combined type electric car frame structure. |
| CN204603269U (en) * | 2015-04-28 | 2015-09-02 | 苏州广型模具有限公司 | A kind of die casting compression assemblies with refrigerating function |
| CN105751446A (en) * | 2016-05-12 | 2016-07-13 | 江苏泽恩汽机车部品制造有限公司 | Core-pulling demolding device based on hollow product |
| CN107458001A (en) * | 2017-07-06 | 2017-12-12 | 厦门富堡复合材料股份有限公司 | Bicycle frame of carbon fiber integral type pre-shaped moulding process |
| CN207105394U (en) * | 2017-08-01 | 2018-03-16 | 深圳市美好创亿医疗科技有限公司 | Tee pipe fitting injection molding core and injection forming mold |
| CN110508749A (en) * | 2019-09-18 | 2019-11-29 | 合肥工业大学 | Cycle frame and cycle frame preparation method |
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| CN114309487A (en) * | 2022-01-12 | 2022-04-12 | 鼎镁新材料科技股份有限公司 | Bicycle frame integrated casting internal mold structure with hollow structure and forming preparation method |
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Application publication date: 20210611 |