Patent Application
20230061600
The present invention relates to a molding method and, more particularly, to a method for forming and making a product of compressible material by using a molding device.
A conventional method for molding compressible material, such as a carbon bar, comprises filling the compressible material into a die, compressing the compressible material by a hydraulic cylinder, delivering the compressible material to a heating furnace to perform a sintering process, cooling the compressible material during a long period of time, and stripping the compressible material from the die to finish a product of the compressible material. However, the hydraulic cylinder cannot control the compression amount of the compressible material so that the volume of the compressible material is easily changed. In addition, the heating furnace has to heat the compressible material during a long period of time, thereby increasing the working time and the cost of fabrication. Further, the compressible material is cooled during a long period of time, thereby increasing the working time and the cost of fabrication. Further, the compressible material is stripped from the die by the hydraulic cylinder so that the adhesive is easily adhered to the hydraulic cylinder, and the powder easily spills outward.
In accordance with the present invention, there is provided a method for forming a product of compressible material, comprising:
a first step including:
a first substep of preparing compressible material;
a second substep of assembling a molding fixture that includes a base provided with a biasing mechanism, a bearing set arranged above the base, a filling tube arranged between the bearing set and the base and provided with a molding chamber, a pole disposed in the filling tube, an adjusting screw mounted on the bearing set and movable in the filling tube, and a clamping mechanism arranged outside the filling tube;
a third substep of filling the compressible material into the molding chamber of the filling tube;
a fourth substep of clamping the filling tube by the clamping mechanism; and
a fifth substep of driving and moving the adjusting screw downward in the molding chamber of the filling tube to compress the compressible material;
a second step of delivering the molding fixture to a heating module to perform a heating process to the molding fixture so that the compressible material in the molding chamber of the filling tube is heated and melted;
a third step of delivering the molding fixture to a cooling module to perform a cooling process to the molding fixture so that the compressible material in the molding chamber of the filling tube is cooled and solidified to form a product;
a fourth step of stripping the molding fixture from the product; and
a fifth step of finishing and taking out the product of the compressible material.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Referring to
The molding fixture 20 includes a base 23, a pole (or mandrel or core bar) 25 mounted on the base 23, a filling tube 24 mounted on the base 23 and surrounding the pole 25, a driving mechanism 27 mounted on the filling tube 24, and a clamping mechanism 26 mounted on the filling tube 24 and disposed between the driving mechanism 27 and the base 23.
The base 23 is provided with a biasing mechanism 231 biasing against the filling tube 24 and the pole 25. The filling tube 24 is made of metal with high heat conductivity and has an interior provided with a molding chamber 241 having a cylindrical shape. The filling tube 24 has a lower end mounted on the base 23. The filling tube 24 is arranged between the driving mechanism 27 and the biasing mechanism 231. The pole 25 is disposed in and covered by the molding chamber 241 of the filling tube 24. The driving mechanism 27 is electrically connected with an actuator (such as a motor) and includes a bearing set 22 mounted on an upper end of the filling tube 24, and an adjusting screw 21 mounted on the bearing set 22 and connected with the actuator.
The bearing set 22 is provided with an internal thread. The filling tube 24 is arranged between the bearing set 22 and the biasing mechanism 231 of the base 23. The adjusting screw 21 is screwed through the internal thread of the bearing set 22. The adjusting screw 21 is driven and rotated by the actuator. Thus, when the adjusting screw 21 is rotated, the adjusting screw 21 is moved upward or downward relative to the bearing set 22. The bearing set 22 includes an upper bearing 221, a lower bearing 222 combined with the upper bearing 221, and a push member (or press member or piston or locking mechanism) 223 secured to the adjusting screw 21 and movably mounted in the filling tube 24. The internal thread of the bearing set 22 is formed on the upper bearing 221 and screwed onto the adjusting screw 21. The upper end of the filling tube 24 is sandwiched between the upper bearing 221 and the lower bearing 222. The push member 223 is arranged at a center of the bearing set 22 and has a hollow interior allowing insertion of the pole 25. The push member 223 is inserted into the upper end of the filling tube 24. The push member 223 has an upper end provided with a connecting portion 224 secured to a lower end of the adjusting screw 21 by a fastener 70 so that the push member 223 is moved with the adjusting screw 21 synchronously. The push member 223 has a lower end provided with a dustproof flange (or an O-ring) 225 pressing an inner wall of the filling tube 24 to prevent powder from leaking outward. Thus, the push member 223 is rotated by and moved with the adjusting screw 21 and is movable in the molding chamber 241 of the filling tube 24 by rotation of the adjusting screw 21.
The clamping mechanism 26 includes a first clamping member 261 covering and clamping an exterior of the filling tube 24 and a second clamping member 262 covering and clamping an exterior of the first clamping member 261. The first clamping member 261 functions as an inner sleeve and a heating member and includes two semi-cylindrical shells detachably connected with each other. The second clamping member 262 functions as an outer sleeve and includes two semi-cylindrical shells detachably connected with each other.
The heating module 30 is connected with an electric control device to provide a heat conduction. The heating module 30 is preferably kept at a constant temperature of 200° C. In practice, the molding fixture 20 is delivered to the heating module 30 to perform the heating process.
The cooling module 40 is connected with an air pipeline of an air pressure device to provide a cooling effect. In practice, the molding fixture 20 is delivered to the cooling module 40 to perform the cooling process.
Referring to
In the first substep (a1), the compressible material 10 is mixed with an adhesive at a predetermined proportion according to the requirement. The adhesive includes PE powder, plastic powder or the like.
In the fourth substep (a4), the clamping mechanism 26 withstands the expansion force applied on the filling tube 24 during compression of the compressible material 10.
In the a fifth substep (a5), the compressible material 10 is arranged and compressed between the adjusting screw 21 and the biasing mechanism 231. The biasing mechanism 231 is compressed and retracted by the compressible material 10 to adjust the volume variation of the compressible material 10. The compressible material 10 has a compact structure by compression of the adjusting screw 21.
In the third step (C), the cooling module 40 delivers cold air to the molding fixture 20, so that the cold air is circulated in the interior room 41 of the cooling module 40 and carries hot air outward from the molding fixture 20 to enhance the cooling effect.
The fourth step (D) includes a first substep (D1) of removing the clamping mechanism 26 and the bearing set 22 from the filling tube 24, and a second substep (D2) of removing the filling tube 24 from the base 23 by a restoring force of the biasing mechanism 231, to finish the stripping process. Thus, the biasing mechanism 231 provides an assistant elastic force to the filling tube 24 so that the filling tube 24 is removed from the base 23 quickly. In the fourth step (D), a clearance X is formed between the compressible material 10 and the molding chamber 241 of the filling tube 24 due to thermal expansion and contraction produced during the second step (B) and the third step (C) so that the molding fixture 20 is stripped from the product 50 easily and quickly.
In the preferred embodiment of the present invention, the pole 25 is provided with a plurality of air holes 251 connected to an air exhaust device to drain excessive gas and to prevent the adhesive from adhering to the filling tube 24. Thus, the pole 25 has an air exhaust effect by the air holes 251 to reduce the powder dust.
In the preferred embodiment of the present invention, the biasing mechanism 231 includes an elastic member, such as a spring.
In the preferred embodiment of the present invention, the biasing mechanism 231 provides a pretension and a balance compression force.
In the preferred embodiment of the present invention, the compressible material 10 includes activated carbon, carbon fiber or filter material. The compressible material 10 is melted at a high temperature, is cured when being cooled, and may be compressed to form a lump.
Accordingly, the molding fixture 20 has a high heat conductive feature to conduct the heat from the heating module 30 quickly so as to enhance the heating effect of the heating module 30. In addition, the heating module 30 heats the compressible material 10 rapidly in the molding chamber 241 of the filling tube 24 to shorten the melting time of the compressible material 10. Further, the cooling module 40 dissipates the heat in the molding fixture 20 quickly so that the compressible material 10 is cooled and solidified rapidly. Further, a clearance X is formed between the compressible material 10 and the molding chamber 241 of the filling tube 24 by thermal expansion and contraction produced during the heating and cooling processes so that the molding fixture 20 is stripped from the product 50 easily and quickly. Further, the biasing mechanism 231 provides an assistant elastic force to the filling tube 24 so that the filling tube 24 is removed from the base 23 quickly. Further, the molding device greatly reduces the working time for heating and molding the compressible material 10, to largely shorten the time for manufacturing the product 50 of the compressible material 10, to increase the productivity and quality of the product 50, and to decrease the cost of production.
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the scope of the invention.
