CN216858185U - Integral forming device for front frame of electric bicycle - Google Patents

Abstract

The utility model discloses an integral forming device for a front frame of an electric bicycle, which comprises a die body, wherein the die body comprises a die cavity, and a metal core is arranged in the die cavity; the heat preservation furnace is arranged at the bottom of the die body, and the heat preservation furnace is filled with aluminum alloy liquid; the liquid lifting part comprises a liquid lifting pipe arranged along the vertical direction, the top end of the liquid lifting pipe extends into the die cavity, the bottom end of the liquid lifting pipe extends into the heat preservation furnace, and the bottom end of the liquid lifting pipe is lower than the liquid level of the aluminum alloy liquid; the air pressure input part comprises an air pressure pipe, the output end of the air pressure pipe extends into the heat preservation furnace, and the output end of the air pressure pipe is higher than the liquid level of the aluminum alloy liquid. The utility model greatly improves the production efficiency and the process yield, can ensure the product quality, saves the process for manufacturing the sand core, has no waste sand pollution, and is environment-friendly and clean.

Description

Integral forming device for front frame of electric bicycle

Technical Field

The utility model relates to the technical field of forming of large thin-wall complex aluminum alloy structural parts, in particular to an integral forming device for a front frame of an electric bicycle.

Background

The front frame of the electric bicycle is a key structure of the bicycle, and has a complex shape, and the wall thickness of the front frame is only 2-4mm but is not uniform; the shape of the inner cavity is complex, the integral forming is very difficult, and the 6061 aluminum alloy pipe or the forged piece is generally welded in the prior art. The frame before welding has the problems of difficult avoidance of welding defects, weak performance of a welding joint and potential safety hazards, and the problems of serious environmental pollution and low production efficiency exist in the welding process. In the prior art, the lower tube and the motor hanging bracket are integrally cast and molded, but the sand core is used for molding cavities of the battery bin and the lower tube, so that the processes are increased, the cost is high, the production efficiency is low, and serious solid waste pollution is caused. Therefore, a novel device for integrally forming a front frame of an electric bicycle is needed at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an integral forming device for a front frame of an electric bicycle, which is used for solving the problems in the prior art, avoiding the problems of pollution and low production efficiency of the front frame of the electric bicycle cast by using a sand core and ensuring the quality of a formed product.

In order to achieve the purpose, the utility model provides the following scheme: the utility model provides an integral forming device for a front frame of an electric bicycle, which comprises:

the die comprises a die body, a die cavity and a metal core, wherein the die body comprises the die cavity;

the heat preservation furnace is arranged at the bottom of the die body, and the heat preservation furnace is filled with aluminum alloy liquid;

the liquid lifting part comprises a liquid lifting pipe arranged along the vertical direction, the top end of the liquid lifting pipe extends into the die cavity, the bottom end of the liquid lifting pipe extends into the heat preservation furnace, and the bottom end of the liquid lifting pipe is lower than the liquid level of the aluminum alloy liquid;

the aluminum alloy liquid heat preservation furnace comprises an air pressure input part, wherein the air pressure input part comprises an air pressure pipe, the output end of the air pressure pipe extends into the heat preservation furnace, and the output end of the air pressure pipe is higher than the liquid level of the aluminum alloy liquid.

Preferably, the metal core comprises a bent core, a battery bin core, a left straight tube core, a right straight tube core, a wire hole core and a motor hanger core, the left straight tube core and the right straight tube core are detachably connected to the left side and the right side of the battery bin core, and the bent core, the left straight tube core, the right straight tube core and the wire hole core are in contact with each other in pairs.

Preferably, the mold body comprises an upper mold and a lower mold, and the upper mold and the lower mold form the mold cavity after being closed.

Preferably, a heat insulation layer is arranged between the lower die and the heat insulation furnace, a through hole is formed in the heat insulation layer in a penetrating mode, and the liquid lifting pipe penetrates through the through hole.

Preferably, a flow regulating valve is installed on the pneumatic tube.

Preferably, the air pressure pipe extends into the heat preservation furnace from the top end of the heat preservation furnace, and the part of the air pressure pipe extending into the heat preservation furnace is arranged along the vertical direction.

The utility model discloses the following technical effects: the method comprises the steps of firstly placing a metal core required to be used in the forming process in a die cavity, then closing the die body, solidifying by adopting air pressure mold filling and air pressure in the forming process, filling aluminum alloy liquid in a closed heat preservation furnace, then introducing gaseous working medium through an air pressure pipe to increase the air pressure in the furnace, introducing the aluminum alloy liquid through a bottom opening of a liquid lifting pipe under the action of the air pressure, ascending along the liquid lifting pipe, finally pressing the aluminum alloy liquid into the die cavity of the die body until the aluminum alloy liquid is full of the aluminum alloy liquid, completing the air pressure mold filling work, introducing the gaseous working medium into the air pressure pipe again to pressurize the air pressure pipe, further continuously applying the air pressure to the aluminum alloy liquid full of the die cavity, keeping the air pressure for a period of time, enabling the aluminum alloy liquid to be solidified and fed under the action of the air pressure, completing the air pressure solidification work, finally releasing the pressure, cooling to a certain temperature, and opening the die to obtain a core-pulling part, thus obtaining the front bicycle frame. The utility model improves the production efficiency and the process yield, can ensure the product quality, saves the process for manufacturing the sand core, has no waste sand pollution, and is environment-friendly and clean.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a front view of the integral forming device for the front frame of the electric bicycle according to the present invention;

FIG. 2 is a top view of the metal core of the present invention after it has been placed;

FIG. 3 is a schematic view of a work piece made according to the present invention;

FIG. 4 is a schematic view showing the structure of a lift tube in example 2;

FIG. 5 is a schematic view of the structure of the insulating layer in example 2;

wherein, 1 is right straight tube core, 2 is left straight tube core, 3 is the elbow core, 4 is the line hole core, 5 is motor hanger core, 6 is battery storehouse core, 7 is the mould, 8 is the lower mould, 9 is the stalk, 10 is the pneumatic tube, 12 is the heat preservation stove, 13 is aluminium alloy liquid, 14 is flow control valve, 15 is the heat preservation, 16 is the perforation, 17 is the inner tube, 18 is the outer tube, 19 is the support column, 20 is the heat preservation cotton, 21 is the lag, 22 is the connecting hole, 23 is flexible arch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.

Example 1

Referring to fig. 1-2, the present invention provides an electric bicycle front frame integral forming device, comprising:

the mould comprises a mould body, wherein the mould body comprises a mould cavity, a metal core is arranged in the mould cavity, the shape of the metal core is consistent with that of an inner cavity of the front frame, the metal core is made of mould steel, and all parts of the metal core are arranged in the mould cavity;

the heat preservation furnace 12 is arranged at the bottom of the die body, the heat preservation furnace 12 is filled with aluminum alloy liquid 13, the aluminum alloy liquid 13 is used as a raw material for preparing a workpiece (product), and the aluminum alloy liquid 13 comprises various casting aluminum alloys which can be welded with 6061 in the prior art;

the liquid lifting part comprises a liquid lifting pipe 9 arranged in the vertical direction, the top end of the liquid lifting pipe 9 extends into the die cavity, the bottom end of the liquid lifting pipe 9 extends into the heat preservation furnace 12, the bottom end of the liquid lifting pipe 9 is lower than the liquid level of the aluminum alloy liquid 13, when gaseous working medium is input into the heat preservation furnace 12, the air pressure in the furnace is increased, so that the aluminum alloy liquid 13 flows upwards to the die cavity along the bottom opening of the liquid lifting pipe 9 and fills the die cavity;

the device comprises an air pressure input part and a heat preservation furnace, wherein the air pressure input part comprises an air pressure pipe 10, the output end of the air pressure pipe 10 extends into the heat preservation furnace 12, the output end of the air pressure pipe 10 is higher than the liquid level of aluminum alloy liquid 13, the air pressure pipe 10 is externally connected with a pressure pump and used for inputting gaseous working media into the heat preservation furnace 12 for pressurization, the gaseous working media comprise argon, nitrogen or compressed air, and the pressure of the gaseous working media is 0-0.6 MPa.

When the device is used, firstly, a metal core required to be used in the forming process is placed in a die cavity, then the die body is closed, the air pressure filling and air pressure solidification are adopted in the forming process, an aluminum alloy liquid 13 is filled in a closed heat preservation furnace 12, then a gaseous working medium is introduced through an air pressure pipe 10, the air pressure in the furnace is increased, under the action of the air pressure, the aluminum alloy liquid 13 is introduced through the bottom opening of a liquid lifting pipe 9, ascends along the liquid lifting pipe 9 and is finally pressed into the die cavity of the die body until the die cavity is full, the air pressure filling work is completed, the gaseous working medium is introduced into the air pressure pipe 10 to be pressurized, further, the air pressure is continuously applied to the aluminum alloy liquid 13 full of the die cavity, the time is kept, the aluminum alloy liquid 13 is solidified and fed under the action of the air pressure, the air pressure solidification work is completed, the pressure is finally released, and after the cooling is carried out to a certain temperature, a die is opened, a core is pulled out, and a bicycle frame is obtained, i.e. the workpiece, see fig. 3.

Further optimize the scheme, the metal core includes elbow core 3, battery storehouse core 6, left side straight tube core 2, right side straight tube core 1, line hole core 4 and motor hanger core 5, elbow core 3, left side straight tube core 2, two liang of mutual contacts between right side straight tube core 1 and the line hole core 4, left side straight tube core 2 and right straight tube core 1 can dismantle the left and right sides of connecting in battery storehouse core 6, can dismantle the inclined plane between battery storehouse core 6 and left straight tube core 2 and the right straight tube core 1 and be connected, and along with the horizontal motion of battery storehouse core 6, control the straight tube core along the horizontal line motion perpendicular with battery storehouse core 6 direction of motion, realize loosing core and put the core.

The elbow core 3 is made of die steel, one end of the elbow core is connected with the core-pulling mechanism and is driven by the core-pulling mechanism to be pushed or pulled out, and the other end of the elbow core is a vertical surface and is contacted with the left straight tube core 2;

one end of the left straight tube core 2, which is contacted with the elbow core 3, is a vertical surface, the other end of the left straight tube core, which is contacted with the battery bin core 6, is an inclined surface, a dovetail structure is arranged on the inclined surface, the left straight tube core 2 and the battery bin core 6 are connected into a whole through the dovetail structure, and when the battery bin core 6 vertically moves, the left straight tube core 2 is horizontally drawn out and pushed in under the driving of the dovetail structure; the right end of the right straight tube core 1 is a vertical surface and is tightly contacted with the wire hole core 4, the surface of the left end of the right straight tube core 1 contacted with the battery bin core 6 is an inclined surface, a dovetail structure is arranged on the inclined surface and is connected with the battery bin core 6 into a whole through the dovetail structure, and when the battery bin core 6 vertically moves, the right straight tube core 1 is horizontally drawn out and pushed in under the driving of the dovetail structure;

the left end surface of the wire hole core 4 is tightly attached to the right straight tube core 1, the right end surface is an inclined surface with a dovetail structure, is attached to the left end surface of the motor hanger core 5, and horizontally moves to pull out and push in the process that the motor hanger core 5 is horizontally pulled out and pushed in;

the shape of the motor hanger core 5 is consistent with the inner cavity of the motor hanger, and the motor hanger core can be horizontally drawn out and pushed in the direction vertical to the arc of the hanger.

According to the further optimized scheme, the die body comprises an upper die 7 and a lower die 8, and a die cavity is formed after the upper die 7 and the lower die 8 are assembled. Go up mould 7 and lower mould 8 and respectively open half die cavity and two sets of ingates that have four preceding frames, half die cavity of preceding frame is arranged around stalk 9, and the ingate quantity is 4 ~ 8, and the shape is flat trapezoidal, uses stalk 9 as the center, and radial arrangement, one end is linked together with stalk 9 or sprue, and the other end is linked together with the motor hanger half die cavity of preceding frame, and its thickness is 2 ~ 8 mm. The number of the liquid lifting pipes 9 is correspondingly 1-3, the inner diameter is 70-100 mm, the upper end of the liquid lifting pipes is connected with an ingate or a sprue, and the lower end of the liquid lifting pipes extends into the lower part of the aluminum alloy liquid level of the holding furnace 12.

Further optimize the scheme, be equipped with heat preservation 15 between lower mould 8 and heat preservation stove 12, heat preservation 15 runs through and has seted up perforation 16, and in perforation 16 was worn to locate by the stalk 9, heat preservation 15 was made by insulation material, prevents that the lost temperature of stalk 9 from leading to the problem appearance that aluminum alloy liquid 13 solidifies in advance.

In a further optimized scheme, a flow regulating valve 14 is installed on the air pressure pipe 10 and used for regulating the introduction amount of the gaseous working medium.

According to the further optimization scheme, the air pressure pipe 10 extends into the heat preservation furnace 12 from the top end of the heat preservation furnace 12, and the part of the air pressure pipe 10 extending into the heat preservation furnace 12 is arranged in the vertical direction, so that the gaseous working medium introduced into the air pressure pipe 10 directly provides pressure in the vertical direction for the aluminum alloy liquid level.

An integral forming method for a front frame of an electric bicycle comprises the following steps:

the method comprises the following steps: pushing the metal core in place, and putting all parts of the metal core into the die cavity, wherein the core pulling mechanism corresponding to the elbow core 3 drives the elbow core 3 to reset; the battery bin core 6 is reset, and simultaneously, the left straight tube core 2 and the right straight tube core 1 are driven to horizontally move in place and are respectively contacted with the battery bin core 6 and the wire hole core 4; the motor hanger core 5 is pushed to reset, and simultaneously drives the wire hole core 4 to horizontally move and reset, and the elbow core 3, the left straight tube core 2, the right straight tube core 1, the battery bin core 6, the wire hole core 4 and the motor hanger core 5 are in close contact with each other two by two;

step two: closing the die, and enabling the upper die 7 to descend to be attached to and pressed tightly with the lower die 8 under the pressure of 500-2000 KN;

step three: filling the mold by air pressure, namely filling air into the heat preservation furnace 12 for pressurizing, increasing the air pressure in the furnace to 0.05-0.2 MPa within 2-10 seconds, and pushing the aluminum alloy liquid 13 into the mold cavity to be filled;

step four: solidifying the air pressure, continuously inflating and pressurizing the heat preservation furnace 12, increasing the air pressure in the furnace to 0.10-0.60 MPa within 2-5 seconds, and keeping for 60-120 seconds; solidifying the aluminum alloy liquid 13 under the action of air pressure, and pushing the aluminum alloy liquid 13 to perform feeding so as to obtain a workpiece;

step five: releasing pressure, wherein the aluminum alloy liquid 13 in the lift pipe 9 flows back to the furnace, and the workpiece is kept in the die cavity for 60-150 seconds;

step six: releasing the mold and pulling the core, releasing the locking of each part of the metal core, and driving the elbow core 3 to be pulled out by a core pulling mechanism corresponding to the elbow core 3; the battery bin core 6 is extracted, the left straight tube core 2 and the left straight tube core 1 are driven to move horizontally to enter a battery bin, the motor hanger core 5 is extracted, the wire hole core 4 is driven to move horizontally to be extracted, and the elbow core 3, the left straight tube core 2, the left straight tube core 1, the battery bin core 6, the wire hole core 4 and the motor hanger core 5 are separated from the front frame;

step seven: and opening the die to take out the part, relieving pressure by the die opening and closing mechanism, driving the upper die 7 to move upwards, ejecting out the front frame, and cutting the ingate to obtain the front frame of the bicycle.

The forming method has high production efficiency, the yield per hour can reach 48-64 pieces, the process yield is up to more than 70%, the process yield is improved by 30% compared with the existing casting method, the process of preparing the sand core is omitted, no waste sand pollution is caused, the environment is protected, the cleanness is realized, and the prepared product has smooth appearance, accurate size and excellent performance.

Example 2

Referring to fig. 4-5, the difference from the above embodiment 1 is that the lift pipe 9 has a two-layer structure, and includes an inner pipe 17 and an outer pipe 18, the inner pipe 17 is sleeved in the outer pipe 18, and the inner pipe 17 and the outer pipe 18 are fixed by a plurality of supports 19, a gap is left between the inner pipe 17 and the outer pipe 18, and the gap is filled with thermal insulation cotton 20, and is matched with an external thermal insulation layer 15 to achieve a dual thermal insulation effect, and the design of the inner pipe 17 and the outer pipe 18 can improve the protection performance thereof, so as to prevent leakage of the aluminum alloy liquid 13 due to leakage of a single pipe, if the inner pipe 17 is damaged and leaked, the aluminum alloy liquid 13 is burned out at most of the thermal insulation cotton 20, but still protected by the outer pipe 18, and normal operation is not affected, and if the outer pipe 18 is damaged and leaked, the aluminum alloy liquid 13 is not prevented from being conveyed by the inner pipe 17.

The lateral surface cladding of outer tube 18 has lag 21, and lag 21 is made by anti-skidding rubber, improves its and the perforation 16 between frictional force, and the perforation inner wall is fixed with a plurality of flexible archs 23 simultaneously, offers connecting hole 22 in the corresponding position of the lateral surface of outer tube 18, and when lift tube 9 passed perforation 16 for flexible archs 23 correspond inserts connecting hole 22, can improve the steadiness of connecting by a wide margin.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (6)

1. The utility model provides an electric bicycle front frame integrated into one piece device which characterized in that includes:

the die comprises a die body, a die cavity and a metal core, wherein the die body comprises the die cavity;

the heat preservation furnace (12), the heat preservation furnace (12) is arranged at the bottom of the die body, and the heat preservation furnace (12) is filled with aluminum alloy liquid (13);

the liquid lifting part comprises a liquid lifting pipe (9) arranged along the vertical direction, the top end of the liquid lifting pipe (9) extends into the die cavity, the bottom end of the liquid lifting pipe (9) extends into the heat preservation furnace (12), and the bottom end of the liquid lifting pipe (9) is lower than the liquid level of the aluminum alloy liquid (13);

the aluminum alloy heat preservation furnace comprises an air pressure input part, wherein the air pressure input part comprises an air pressure pipe (10), the output end of the air pressure pipe (10) extends into the heat preservation furnace (12), and the output end of the air pressure pipe (10) is higher than the liquid level of aluminum alloy liquid (13).

2. The device for integrally forming the front frame of the electric bicycle according to claim 1, wherein: the metal core comprises a bent head core (3), a battery bin core (6), a left straight tube core (2), a right straight tube core (1), a wire hole core (4) and a motor hanger core (5), the left straight tube core (2) and the right straight tube core (1) are detachably connected to the left side and the right side of the battery bin core (6), and the bent head core (3), the left straight tube core (2), the right straight tube core (1) and the wire hole core (4) are in mutual contact in a pairwise mode.

3. The device for integrally forming the front frame of the electric bicycle according to claim 1, wherein: the die body comprises an upper die (7) and a lower die (8), and the upper die (7) and the lower die (8) are matched to form the die cavity.

4. The device for integrally forming the front frame of the electric bicycle according to claim 3, wherein: an insulating layer (15) is arranged between the lower die (8) and the heat preservation furnace (12), a through hole (16) is formed in the insulating layer (15) in a penetrating mode, and the liquid lifting pipe (9) penetrates through the through hole (16).

5. The device for integrally forming the front frame of the electric bicycle according to claim 1, wherein: and a flow regulating valve (14) is arranged on the air pressure pipe (10).

6. The device for integrally forming the front frame of the electric bicycle according to claim 1, wherein: the air pressure pipe (10) extends into the heat preservation furnace (12) from the top end of the heat preservation furnace, and the part of the air pressure pipe (10) extending into the heat preservation furnace (12) is arranged along the vertical direction.

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