CN109796125B - Centrifugal forming processing method and processing device thereof - Google Patents
Centrifugal forming processing method and processing device thereof Download PDFInfo
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- CN109796125B CN109796125B CN201910089664.2A CN201910089664A CN109796125B CN 109796125 B CN109796125 B CN 109796125B CN 201910089664 A CN201910089664 A CN 201910089664A CN 109796125 B CN109796125 B CN 109796125B
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Abstract
The invention discloses a centrifugal forming processing method, which comprises the following steps: placing a workpiece to be formed on a press molding surface, and fixing the workpiece to be formed by using a clamp; driving the press-molded surface and the workpiece to be molded to rotate around a central shaft, and heating the workpiece to be molded; and stopping heating the workpiece to be formed after the preset time, and stopping driving the profiling surface and the workpiece to be formed to rotate so as to obtain the formed workpiece. The invention also discloses a centrifugal forming processing device which is suitable for the centrifugal forming processing method. The pressed workpiece has low production cost and high qualification rate.
Description
Technical Field
The invention relates to the technical field of forming processing, in particular to a centrifugal forming processing method and a processing device thereof.
Background
The forming process is a process for forming a workpiece by a forming tool having a final surface profile matching the workpiece. At present, the forming processing is to use an upper concave-convex graphite mold and a lower concave-convex graphite mold to carry out the forming processing on workpieces such as glass, acrylic plates and the like, but the method uses 10 to 20 sets of molds for one machine, and the production cost is high. The precision of 10-20 sets of dies cannot be guaranteed to be consistent, so that the machined workpieces are affected to be different in size and effect of workpiece batches due to the fact that the dies are different, the size and effect of the workpieces cannot be accurately controlled, the workpieces cannot be completely attached to one surface due to machining errors between the upper die plate and the lower die plate, and a series of bad factors such as unqualified workpiece production sizes, edges and folds are affected.
Disclosure of Invention
The invention mainly aims to provide a centrifugal forming processing method, which aims to solve the problems of high production cost and low qualification rate of a pressed workpiece in the prior art.
In order to achieve the above object, the present invention provides a centrifugal molding processing method, which includes the steps of:
placing a workpiece to be formed on a press molding surface, and fixing the workpiece to be formed by using a clamp;
driving the press-molded surface and the workpiece to be molded to rotate around a central shaft, and heating the workpiece to be molded;
and stopping heating the workpiece to be formed after the preset time, and stopping driving the profiling surface and the workpiece to be formed to rotate so as to obtain the formed workpiece.
Preferably, the step of driving the press surface and the workpiece to be formed to rotate around a central axis and heating the workpiece to be formed includes:
starting to heat the workpiece to be formed, and driving the press surface and the workpiece to be formed to rotate to a first speed so that the clamp leaves the workpiece to be formed;
and driving the press surface and the workpiece to be formed to rotate to rise from the first speed to the second speed, and heating the workpiece to be formed to a preset temperature.
Preferably, the step of stopping heating the workpiece to be formed after the preset time, and stopping driving the profiling surface and the workpiece to be formed to rotate to obtain the formed workpiece includes:
after the press surface and the workpiece to be formed are driven to rotate at the second speed for the preset time, heating the workpiece to be formed is stopped, and the press surface and the workpiece to be formed are stopped from being driven to rotate;
when the pressing surface and the workpiece to be formed rotate from the second speed to the first speed, the clamp is used for fixing the workpiece to be formed;
and stopping rotating the press-molded surface and the workpiece to be molded to obtain the molded workpiece.
Preferably, after the step of stopping heating the workpiece to be formed after the lapse of the preset time and stopping driving the profiling surface and the workpiece to be formed to rotate to obtain the formed workpiece, the centrifugal forming processing method further includes:
and cooling the molded workpiece.
The invention also provides a centrifugal forming processing device which is suitable for the centrifugal forming processing method, and comprises a base, a rotating frame, a model, a motor, a fixing mechanism and a heating mechanism, wherein:
the rotary frame is rotatably arranged on the base and comprises a rotary shaft and a plurality of stations distributed around the rotary shaft, the mold is fixedly arranged on each station, and the mold is used for supporting a workpiece and providing a profiling surface facing the rotary shaft for the workpiece;
the motor is positioned on the base, and an output shaft of the motor is in transmission connection with the rotating shaft;
one side of each model is provided with the fixing mechanism, and the fixing mechanism is used for fixing a workpiece on the model;
the heating mechanism is used for heating the workpiece on each station.
Preferably, the rotating frame comprises a plurality of supporting pieces which are sequentially arranged around the rotating shaft, and the supporting pieces are connected with mounting pieces for mounting the model.
Preferably, the fixing mechanism comprises a supporting rod mounted on the rotating frame and a lever rotatably arranged on the supporting rod, the supporting rod extends along the radial direction of the rotating shaft, a fixing piece for pressing and holding a workpiece placed on the model is mounted at one end, close to the model, of the lever, and a balancing piece for balancing the fixing piece is mounted at one end, far away from the model.
Preferably, the heating mechanism comprises a heating layer arranged on the base, the heating layer forms a sealed heating space for accommodating the rotating frame and the model, and a heat insulation layer is arranged on the outer side of the heating layer.
The invention has the beneficial effects that: in the centrifugal forming processing method, a workpiece is placed on a press molding surface, the press molding surface and the workpiece are driven to rotate around a central shaft at a high speed, the workpiece is heated and softened, and the workpiece is subjected to centrifugal force to be pressed and deformed on the press molding surface, so that centrifugal forming processing of the workpiece is realized. Compared with the method for carrying out centrifugal forming processing on the workpiece, the method for carrying out compression molding on the workpiece through the upper die and the lower die can reduce the number of dies, reduce the production cost and improve the economic benefit; and the centrifugal force is skillfully utilized to apply force to the workpiece for profiling, so that the workpiece can be completely attached to the profiling surface, machining errors are reduced, the forming quality of the workpiece is improved, and the production qualification rate of the profiling workpiece is improved.
Drawings
FIG. 1 is a flow chart of a centrifugal forming process according to an embodiment of the invention;
FIG. 2 is a flow chart of a centrifugal forming process according to another embodiment of the invention;
FIG. 3 is a flow chart of a centrifugal forming process according to another embodiment of the invention;
FIG. 4 is a schematic diagram of a centrifugal forming apparatus according to an embodiment of the invention;
fig. 5 is a schematic structural view of a centrifugal molding apparatus according to another embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a centrifugal forming processing method, as shown in fig. 1, comprising the following steps:
s100: and placing the workpiece to be formed on a press surface, and fixing the workpiece to be formed by using a clamp.
In this step, the work piece to be formed is a glass work piece, and a press surface for pressing the glass work piece can be provided by a die, and the press surface is engraved into a press shape required for pressing the glass work piece. The press surface is required to be a vertical press surface, and a glass workpiece is placed at a preset press position on the press surface of the die by a manual or conveying mechanism, so that subsequent press errors caused by the fact that the glass workpiece is placed at an incorrect position on the press surface of the die are avoided. After the glass workpiece is placed on the die, the glass workpiece is fixed on the die through the clamp, so that the next working procedure is convenient.
S200: the dynamic pressure surface and the workpiece to be formed are driven to rotate around a central shaft, and the workpiece to be formed is heated.
In this step, the mold and the glass work piece on the mold are driven to rotate around a central axis, the glass work piece is subjected to centrifugal force due to circular motion, and the calculation formula of the centrifugal force is f=mr ω 2 Wherein M is the mass of the glass workpiece, R is the radius of rotation, and ω is the rotational speed. The centrifugal force applied to the glass workpiece can be calculated according to the mass, the rotation radius and the rotation speed of the glass workpiece, for example, when the mass of the glass workpiece is 0.022kg, the rotation radius is 0.25m, the rotation speed is 6000r/min, and the compression force applied to the glass workpiece is about 2169N. At this time, the centrifugal force applied to the glass workpiece is the pressing force applied to the glass workpiece on the mold. In addition, the glass workpiece is heated by heating modes such as heat conduction or heat radiation, so that the glass workpiece is softened, and the glass workpiece is conveniently pressed.
S300: and stopping heating the workpiece to be molded after the preset time, and stopping driving the dynamic pressure surface and the workpiece to be molded to rotate so as to obtain the molded workpiece.
In the step, the glass workpiece is continuously subjected to the pressing force, and after the preset time, the glass workpiece is completely pressed, and the heating of the glass workpiece is stopped. And stopping driving the mould and the glass workpiece to rotate, wherein after the mould and the glass workpiece stop moving, the glass workpiece is not subjected to profiling force any more, and the formed glass workpiece is obtained.
In a preferred embodiment of the present invention, the step of driving the dynamic pressure profile and the workpiece to be molded to rotate around a central axis and heating the workpiece to be molded includes:
s210: heating the workpiece to be formed, driving the dynamic pressure surface and the workpiece to be formed to rotate to a first speed, and enabling the clamp to leave the workpiece to be formed;
in this step, the heating of the glass workpiece is started, the mold and the glass workpiece are driven to rotate to a first speed, the clamp does not fix the glass workpiece any more, so as to prevent the clamp from damaging the surface of the heated and softened glass workpiece in the subsequent heating process, and at this time, the glass workpiece is fixed on the press surface of the mold by the centrifugal force applied by the glass workpiece.
S220: and driving the dynamic pressure surface and the workpiece to be formed to rotate from a first speed to a second speed, and heating the workpiece to be formed to a preset temperature.
In this step, the mold and the glass work are driven to rotate from a first speed to a second speed. The second speed can be calculated according to a calculation formula of the centrifugal force according to the size of the pressing force required when the glass workpiece is completely deformed. Therefore, the mold and the glass work are driven to rotate at the second speed, and the glass work is subjected to the pressing force required when it is completely deformed. In addition, the glass workpiece is heated to a preset temperature to soften the glass workpiece to a deformable state.
In the above embodiment, the step of stopping heating the workpiece to be molded after the preset time and stopping driving the dynamic pressure profile and the workpiece to be molded to rotate to obtain the molded workpiece includes:
s310: after the dynamic pressure surface and the workpiece to be formed are driven to rotate at the second speed for a preset time, stopping heating the workpiece to be formed, and stopping driving the dynamic pressure surface and the workpiece to be formed to rotate;
in the step, the mould and the glass workpiece are driven to rotate at a second speed for a preset time, so that the glass workpiece is completely attached to the profiling surface, the glass workpiece is deformed completely, and the production quality is improved. After the preset time, the heating of the glass workpiece is stopped, and the glass workpiece starts to cool and gradually harden. And stopping driving the mold and the glass workpiece to rotate, gradually reducing the rotation speed of the mold and the glass workpiece, and gradually reducing the centrifugal force applied to the glass workpiece.
S320: when the rotation of the profiling surface and the workpiece to be formed is reduced from the second speed to the first speed, fixing the workpiece to be formed by using a clamp;
in this step, the rotational speed of the mold and the glass workpiece gradually decreases, and the centrifugal force to which the glass workpiece is subjected gradually decreases, and when the second speed decreases to the first speed, the clamp again fixes the glass workpiece, so that the glass workpiece is not sufficiently fixed to the molding surface of the mold due to the insufficient centrifugal force to which the glass workpiece is subjected along with the decrease of the rotational speed, and the glass workpiece can be prevented from falling from the mold.
S330: and stopping rotating the press-molded surface and the workpiece to be molded to obtain the molded workpiece.
In this step, the mold and the glass work are completely stopped from rotating, and the mold and the glass work are kept in a stationary state, to obtain a molded glass work. After the shaped glass workpiece is obtained, the shaped glass workpiece can be removed from the press surface of the mold by a carrying mechanism.
In a preferred embodiment of the present invention, as shown in fig. 1, after the step of stopping heating the workpiece to be formed and stopping driving the pressing surface and the workpiece to be formed to rotate to obtain the formed workpiece after the preset time has elapsed, the centrifugal forming processing method further includes:
s400: and cooling the molded workpiece.
In the step, the glass workpiece can be naturally cooled, or the glass workpiece is placed in a cooling device for cooling, so that the cooling of the glass workpiece is accelerated, the transition time for entering the next working procedure is saved, and the working efficiency is improved.
The invention also provides a centrifugal forming device, which is suitable for the centrifugal forming method, as shown in fig. 4, and comprises a base 100, a rotating frame 200, a model 300, a motor 400, a fixing mechanism and a heating mechanism, wherein:
the rotating frame 200 is rotatably disposed on the base 100, and the rotating frame 200 includes a rotating shaft 210 and a plurality of stations distributed around the rotating shaft 210, and a mold 300 is fixedly disposed on each station, where the mold 300 is used for supporting the workpiece 10 and providing a pressing surface to the workpiece 10 facing the rotating shaft 210. In this embodiment, the rotating shaft 210 is a basic structure of the rotating frame 200 and is located at a rotation center of the rotating frame 200, the rotating frame 200 passes through a mounting plate of the base through the vertically arranged rotating shaft 210, a bearing is arranged between the rotating shaft 210 and the mounting plate, and the rotating frame 200 can rotate on the base 100. The mold 300 is fixed on the rotating frame 200 by screws, a plurality of molds 300 are installed on the rotating frame 200, and the molds 300 can rotate around the rotating shaft 210 along with the rotating frame 200, so that a plurality of workpieces 10 can be processed simultaneously, and the production efficiency is high. The rotating frame 200 may be made of a high temperature resistant metallic material, such as cast iron. The mold 300 may be a male mold or a female mold, and the mold 300 is provided with a gear at both ends thereof along the rotation direction of the rotating frame 200, respectively, to prevent the work 10 from flying out along the rotation direction of the rotating frame 200, and the mold 300 is made of a high temperature resistant material such as graphite or metal.
The motor 400 is located on the base 100, and an output shaft of the motor 400 is in transmission connection with the rotating shaft 210. In this embodiment, the output shaft of the motor 400 is disposed downward and passes through the mounting plate 110 of the base 100, the motor is mounted on the mounting plate 110 of the base 100 through screws, the output shaft of the motor 400 and the rotating shaft 210 of the rotating frame 200 are both provided with rotating wheels, the motor 400 and the rotating frame 200 are sleeved with belts, and the motor drives the rotating frame 200 through the belts, so as to drive the rotating frame 200 to rotate rapidly.
One side of each of the models 300 is provided with a fixing mechanism for fixing the work 10 to the model 300. In this embodiment, the fixing mechanism may be a plurality of screws disposed on the rotating frame 200, one end of each screw is fixedly provided with a top member for contacting with the workpiece 10 and supporting the workpiece 10, and the screws are connected with an electronic system, and the electronic system controls the screws to tighten so that the top member supports the workpiece 10, so that the workpiece 10 is kept stationary on the mold 300, and the workpiece 10 is prevented from deviating from a preset compression position on the mold 300 when the rotating frame 200 rotates.
The heating mechanism is used to heat the workpiece 10 at each station. In this embodiment, the heating mechanism may be a resistance wire layer mounted on the rotating frame 200 and disposed toward the molding surface of the mold 300, and the resistance wire layer heats the mold 300 and the workpiece 10, and the temperature rises quickly.
In a preferred embodiment of the present invention, as shown in fig. 4 and 5, the rotating frame 200 includes a plurality of supporting members 220 disposed sequentially around the rotating shaft 210, and the supporting members 220 are connected with a mounting member 230 for mounting the mold 300. The mounting member 230 may be made of a high temperature resistant metallic material, such as cast iron. One end of the supporting member 220 is welded and fixed to the rotating shaft 210, and the other end is connected and fixed to the mounting member 230 by screws, and the model 300 is mounted on the mounting member, so that the structure is stable and the operation is reliable.
In a preferred embodiment of the present invention, the fixing mechanism includes a support bar 510 mounted on the rotating frame 200 and a lever 520 rotatably provided on the support bar 510, the support bar 510 extending in a radial direction of the rotation shaft 210, the lever 520 being provided with a fixing member 530 for holding the workpiece 10 placed on the mold 300 at one end thereof close to the mold 300, and a balancing member 540 for balancing the fixing member 530 at one end thereof remote from the mold 300. Wherein, the supporting rod 510, the lever 520, the fixing member 530 and the balancing member 540 are all made of a high temperature resistant metal material, such as cast iron. The fixing member 530 can press the workpiece 10 through points or surfaces, the used models 300 are different, the pressing positions are also different, and the specific shape of the fixing member 530 is not described herein, and needs to be formulated according to the actual situation of profiling. In this embodiment, the supporting rod 510 is perpendicular to the rotating shaft 210, one end of the supporting rod 510 is fixedly connected with the rotating shaft 210 of the rotating frame 200, the other end is provided with a bolt, the lever 520 is sleeved on the bolt and can rotate on the supporting rod 510 around the bolt, and the bolt is a fulcrum of the lever 520. The lever 520 includes a first body 521 and a second body 522 extending from the first body 521, the first body 521 is located above the second body 522 and disposed at an acute angle or a right angle with the second body 522, the first body 521 is disposed towards the molding surface of the mold 300 and is provided with a fixing member 530, and the balancing member 540 is mounted on the second body 522. The first body 521 is close to the mold 300, and the second body 522 is far from the mold 300 because the first body 521 and the second body are disposed at an acute angle or a right angle. In this embodiment, as shown in fig. 4, the balancing member 540 is located below the fixing member 530, and the weight of the balancing member 540 is greater than that of the fixing member 530. According to the lever balancing principle, the balancing member 540 at one end of the lever 520 drives the fixing member 530 at the other end of the lever 520 to move from top to bottom by its own weight, so that the fixing member 530 contacts the workpiece 10 and presses the workpiece 10 against the pressing surface of the mold 300, thereby stabilizing the pressing. The centrifugal force applied to the balancing member 540 increases with the rotation speed of the rotating frame 200, and according to the balance of the force, when the rotating frame 200 reaches a certain rotation speed, the fixing member 530 is separated from the workpiece 10 and does not fix the workpiece 10 any more, and the workpiece 10 is fixed on the pressing surface of the mold 300 by the centrifugal force applied to the workpiece 10, so that other processes can be performed effectively.
In a preferred embodiment of the present invention, as shown in fig. 4 and 5, the heating mechanism includes a heat generating layer 610 disposed on the base 100, the heat generating layer 610 forms a sealed heating space 1 for accommodating the rotating frame 200 and the mold 300, and a heat insulating layer 620 is disposed on the outer side of the heat generating layer 610. The heating layer 610 is composed of an electromagnetic coil, the electromagnetic coil is arranged with the rotation center of the rotating frame 200 as the center of a circle, and the radius of the heating layer surrounded by the electromagnetic coil is larger than the rotation radius of the rotating frame 200, so that a sealed heating space 1 capable of accommodating the rotating frame 200 and the model 300 is formed, and the sealed heating space 1 is a cylindrical space. The mold 300 is located in the sealed heating space 1 and can rotate in the sealed heating space 1 along with the rotating frame 200, and the electromagnetic coil is electrified to emit heat into the sealed heating space 1 so as to heat the mold 300 and the workpiece 10. In addition, a heat insulating layer 620 is arranged on the outer side of the heating layer 610, and the heat insulating layer 620 is preferably made of heat insulating cotton. The heat insulating layer 620 is used for preserving heat of the sealed heating space 1, enhancing the heating effect of the sealed heating space 1 and improving the working efficiency.
The above description and drawings should not be taken as limiting the scope of the invention in any way, but rather should be understood to cover all modifications, structural equivalents, or direct/indirect applications of the invention in the light of the general principles of the present invention which may be employed in the present invention and illustrated by the accompanying drawings.
Claims (7)
1. The centrifugal forming processing method is characterized by comprising the following steps of:
placing a workpiece to be formed on a press molding surface, and fixing the workpiece to be formed by using a clamp, wherein the press molding surface is a vertical press molding surface;
driving the press surface and the workpiece to be formed to rotate around a central shaft and heating the workpiece to be formed, comprising: starting to heat the workpiece to be formed, driving the press-forming surface and the workpiece to be formed to rotate to a first speed, enabling the clamp to leave the workpiece to be formed, and fixing the workpiece to be formed on the press-forming surface by virtue of centrifugal force born by the workpiece to be formed; driving the press surface and the workpiece to be formed to rotate and rise from the first speed to the second speed, wherein the workpiece to be formed is subjected to the press force required by fully deforming the workpiece to be formed, and the workpiece to be formed is heated to a preset temperature;
and stopping heating the workpiece to be formed after the preset time, and stopping driving the profiling surface and the workpiece to be formed to rotate so as to obtain the formed workpiece.
2. The centrifugal molding processing method according to claim 1, wherein the step of stopping heating the workpiece to be molded after the lapse of a preset time and stopping driving the profiling surface and the workpiece to be molded to rotate to obtain a molded workpiece comprises:
after the press surface and the workpiece to be formed are driven to rotate at the second speed for the preset time, heating the workpiece to be formed is stopped, and the press surface and the workpiece to be formed are stopped from being driven to rotate;
when the pressing surface and the workpiece to be formed rotate from the second speed to the first speed, the clamp is used for fixing the workpiece to be formed;
and stopping rotating the press-molded surface and the workpiece to be molded to obtain the molded workpiece.
3. The centrifugal molding processing method according to claim 1, wherein after the step of stopping heating the workpiece to be molded after the lapse of the preset time and stopping driving the profiling surface and the workpiece to be molded to rotate to obtain a molded workpiece, the centrifugal molding processing method further comprises:
and cooling the molded workpiece.
4. A centrifugal molding apparatus, adapted to the centrifugal molding method according to any one of claims 1 to 3, comprising a base, a rotating frame, a mold, a motor, a fixing mechanism, and a heating mechanism, wherein:
the rotary frame is rotatably arranged on the base and comprises a rotary shaft and a plurality of stations distributed around the rotary shaft, the mold is fixedly arranged on each station, and the mold is used for supporting a workpiece and providing a profiling surface facing the rotary shaft for the workpiece;
the motor is positioned on the base, and an output shaft of the motor is in transmission connection with the rotating shaft;
one side of each model is provided with the fixing mechanism, and the fixing mechanism is used for fixing a workpiece on the model;
the heating mechanism is used for heating the workpiece on each station.
5. The centrifugal molding machine of claim 4, wherein the rotating frame includes a plurality of supporting members sequentially disposed around the rotating shaft, the supporting members being connected with mounting members for mounting the mold.
6. The centrifugal molding machine according to claim 5, wherein the fixing mechanism includes a support rod mounted on the rotating frame and a lever rotatably provided on the support rod, the support rod extending in a radial direction of the rotation shaft, a fixing member for pressing a workpiece placed on the mold being mounted at an end of the lever near the mold, and a balancing member for balancing the fixing member being mounted at an end remote from the mold.
7. The centrifugal molding machine of claim 4, wherein the heating mechanism includes a heat generating layer provided on the base, the heat generating layer forming a sealed heating space accommodating the rotating frame and the mold, and a heat insulating layer provided on an outer side of the heat generating layer.
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| CN110759633A (en) * | 2019-10-22 | 2020-02-07 | 东莞市轩驰智能科技有限公司 | Forming method and forming equipment for inverted-buckle type glass cover plate |
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