JP2000094450A - Molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding machine for a resin molded product capable of surely taking the molded product out of a mold. SOLUTION: A molding machine comprises a pair of split molds 1, 2 which are freely opened and closed and made of porous material having a plurality of bores, an air supplying device 3 for supplying air for taking a solidified molded product through each of the plurality of bores out of each of the split molds 1, 2, a mold release agent supplying device 5 for applying a mold release agent before starting filling a molten metal material or a molten resin material into a molding space 4 formed by both the split molds 1, 2 in the clamped state, a pair of common supplying flow paths 6A, 6B for respectively supplying for both the split molds 1, 2 air from the air supplying device 3 and the mold release agent from the mold release agent supplying device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine capable of releasing a molded product formed by a pair of openable and closable split molds made of a porous material having a large number of holes by using air. About.

[0002]

2. Description of the Related Art The above-mentioned molding machine is designed to prevent a molded product from being deformed due to a cooling effect of a mold and an air pressure acting on the entire molded product, or to eliminate a drive mechanism and the like required when using an ejection pin. It is used for the purpose of simplifying the configuration and the like.

[0003] There is a limit in the air pressure for releasing a molded product, and there have been cases where a molded product firmly adhered to a molding surface of a mold cannot be reliably released from the mold.

[0004] Therefore, for example, a through hole is formed at one location of the mold from the outer surface to the molding surface, and a spray release agent dissolved or dispersed in Freon or liquefied natural gas through the through hole is formed in the mold. By spraying into the molding space formed by the above, a mold release agent is applied over the entire molding surface, so that the molded product can be reliably removed by air pressure.
The release agent is shown in the case of a molten resin, but in the case of a molten metal obtained by melting aluminum or the like, in addition to black materials such as graphite, natural minerals such as talc, sericite, and limestone. Alternatively, a coating material in which boron nitride, PTFE (polytetrafluoroethylene), or the like is suspended in water containing a dispersant is used. However, when the release agent is sprayed into the mold from one location as described above, it is not possible to apply the release agent uniformly over the entire molding surface. That is, there are a part where the release agent is sufficiently applied and a part where the release agent is not sufficiently applied (including a case where the release agent is not applied at all). Have not been able to be performed reliably. For this reason, it is common practice to reliably release the molded product by using both the above-mentioned protruding pins and air. However, as described above, the configuration is complicated, and it is not possible to avoid a rise in cost. Had been requested for improvement.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention aims to solve the problem by providing a molding machine capable of reliably removing a molded product from a mold while simplifying the structure. The point is to provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pair of openable and closable split molds made of a porous material having a large number of holes, and a plurality of split molds each of the two split molds. An air supply device for supplying air for releasing the molded product solidified through the holes from the divided molds; and a molding space formed by the divided molds in a state where the divided molds are clamped. A mold release agent supply device for applying a mold release agent before the filling of the molten metal material or the molten resin material into the mold, and the air from the air supply device and the mold release agent from the mold release agent supply device. A pair of common supply flow paths for supplying the two split molds respectively, and the release agent from the release agent supply device is supplied via the supply flow path in a mold clamped state of the two split molds. After being applied to the molding surfaces of both split molds, the molten metal is introduced into the molding space. After filling and solidifying the material or the molten resin material, the mold is opened and the air from the air supply device is discharged from the molding surfaces of the two split molds to the outside through the supply flow path to form a molded product. It is characterized by leaving. Therefore, when molding a molded product, first, both split molds are closed (clamped), and then the release agent is supplied to the split molds via a pair of supply flow paths. The release agent supplied to both split molds is supplied to the inside of both split molds through a large number of holes, and the mold release agent can be evenly applied to the molding surfaces of both split molds. Next, the molten metal material or the molten resin material is filled into the molding space, and when the filled molten metal material or the molten resin material is solidified, the two split molds are opened (the mold is opened), and then the air supply device is used. The air can be supplied to both split molds via the pair of supply flow paths, and the molded product can be separated from the molding surface. By using a configuration in which the release agent and the air are supplied to both split molds through a common pair of supply channels as described above, the configuration is simplified as compared with a configuration in which separate supply channels are provided. In addition, the release agent remaining in the supply channel can be discharged to the outside from the split mold by air.

[0007] By forming the split mold with a sintered metal, a large number of small holes can be formed as compared with a case in which through holes are formed in the split mold by cutting or the like. Thereby, the release agent can be applied more evenly.

[0008] A method for supplying the release agent by applying the release agent to the molding surfaces of the two split molds via the supply flow path using air from the air supply device. The drive source can be omitted.

[0009] The surface of each of the divided dies except for the molding surface is covered with a metal case, and the size of the hole located on the side away from the supply port to each of the divided dies from each of the supply passages is different. It is set smaller than the hole. In other words, by supplying the air and the release agent only from the minimum necessary molding surface, the supply pressure can be increased to more reliably release the molded product and apply the release agent. The supply pressure of the air supplied from the hole located on the side away from the supply port can be suppressed from being lower than the supply pressure of the air supplied from another hole located on the side closer to the supply port than the hole. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 (a), 1 (b) and 2
(A) and (b), a pair of openable and closable split molds 1 and 2 made of a porous material having a large number of holes, and the divided molds are passed through a large number of holes in each of the divided molds 1 and 2. Type 1,
An air supply device 3 for supplying air for releasing the molded product solidified in the molds 2 from the split molds 1 and 2; and the split molds 1 in a state where the split molds 1 and 2 are clamped. A mold release agent supply device 5 for applying a mold release agent before the filling of the molten resin material into the molding space 4 formed by the molds 1 and 2; air from the air supply device 3; 1 shows a molding machine for molding a resin molded product having common supply passages 6A and 6B for supplying a release agent from an agent supply device 5 to each of the split molds 1 and 2 respectively. . The present invention is applicable not only to molding a molten resin material to obtain a resin molded product, but also to melting a metal such as aluminum, magnesium, or copper in a metal casting mold or a die casting mold. It can also be applied to a casting machine (molding machine) or a die casting machine (molding machine) for pouring and solidifying (solidifying) into the inside to obtain a metal product (molded product) having a predetermined shape.

A first flow path 7 connected to the supply outlet of the release agent supply device 5, a second flow path 8 and a third flow path 9 branched from the first flow path 7 into two flow paths. And these flow paths 8,
9 are connected to the lower ends of the flow directions 9 in the flow direction, respectively, and the common supply flow paths 6A, 6A, which connect the discharge sides of the electromagnetic valves 10, 11 and the split molds 1, 2 are connected to each other. 6B to form a release agent supply circuit. Therefore, by switching the electromagnetic valves 10 and 11, it is possible to switch between a supply state in which the release agent from the release agent supply device 5 is supplied to the supply channels 6 </ b> A and 6 </ b> B and a non-supply state in which the supply is shut off. I can do it.

A fourth flow path 12 connected to a supply outlet of the air supply device 3, a fifth flow path 13 and a sixth flow path 14 branched from the fourth flow path 12 into two flow paths. And the electromagnetic valves 10 and 11 to which lower ends of the flow paths 13 and 14 in the flow direction are connected, respectively, and the discharge sides of the electromagnetic valves 10 and 11 and the split molds 1 and 2 are connected. The common supply channels 6A and 6B are provided to form an air supply circuit. Therefore, by switching the electromagnetic valves 10 and 11, it is possible to switch between a supply state in which the air from the air supply device 3 is supplied to the supply flow paths 6A and 6B and a non-supply state in which the supply is shut off. ing.

The two split molds 1 and 2 are shown in FIGS.
As shown in (b) and FIGS. 2 (a) and 2 (b), a mold-clamped state in which the mold is closed by moving to a side approaching each other to fill the molten resin, and the molten resin filled after the mold-clamping Can be moved in the approaching / separating direction by a driving device (not shown) so that the mold can be switched to a mold opening state in which the molds are opened by moving to the side separated from each other to take out a molded product formed by solidification. As shown in FIGS. 3 (a) and 3 (b) and FIGS. 4 (a) and 4 (b),
As shown in (b), only one of the split molds 2 may be configured to be movable so that only one of the split molds 2 can be moved in the approaching / separating direction by a driving device (not shown). FIG.
In FIGS. 4 (a) and 4 (b) and FIGS. 4 (a) and 4 (b), the right split mold 2 is made movable, but the left split mold 1 may be made movable.

The split molds 1 and 2 are formed by a sintering method called powder metallurgy, in which two or more powders having different components are mixed, and two or more powders having the same component but different particle sizes are mixed. Then, a compact having a predetermined shape and strength is produced by applying a compressive force, and the compact is heated at a temperature lower than the melting point of the main component using a sintering furnace to obtain a porous body. I have to. Then, as shown in FIG. 5, the sintering temperature of the compact may be partially changed, or the density of the holes may be partially changed by partially recompressing or resintering. In FIG. 5, the size of the hole 1C or 2C located near the center, that is, the side closer to the supply port 1K or 2K, is changed to the other hole 1B or 2B on the side farther from the supply port 1K or 2K than the hole. , Formed at a position larger than 1A or 2A and located at the outer peripheral portion, that is, the supply port 1K or 2K.
The size of the hole 1A or 2A on the side away from the hole is formed smaller than the other hole 1B or 2B, 1C or 2C located on the side closer to the supply port 1K or 2K than the hole, and the size of the intermediate position Hole 1B or 2B is replaced with hole 1
C or 2C, 1A or 2A, the internal pressure increases as the distance from the supply port 1K or 2K to the split mold 1 or 2 shown in FIG. 5 increases when air is supplied. To prevent the air pressure from dropping, so that the injected air pressure is almost the same in all the holes,
It is configured such that the distance of the jetted release agent is almost the same in any hole. In FIG. 5, three types of holes are formed. However, as shown in FIG. 6, the holes are formed of two types of holes (the outer hole 1A or 2A is smaller than the inner hole 1B or 2B). May be. The effect that the internal pressure can be made uniform at any location can be enhanced as the number of locations where the size of the hole is changed is increased. The surfaces of the split molds 1 and 2 except for the molding surfaces 1S and 2S are covered with metal cases 15 and 15, and the heat resistance is high between the cases 15 and 15 and the split molds 1 and 2. By filling the silicone rubber 16, the split mold 1,
The seal between the metal case 2 and the metal case 15, 15 is increased to prevent the release agent and air from leaking from other than the molding surfaces 1S, 2S, so that the release agent is only from a minimum necessary portion. And air can be supplied.

Further, by forming the split molds 1 and 2 by a sintering method called powder metallurgy, there is an advantage that the size of the holes can be easily changed and an advantage that many small holes can be easily formed. 6 and 7 (a),
As shown in (b), a through hole is formed by cutting in the formed split molds 1 and 2, or a through hole is formed by forming such that a through hole is formed when forming the split molds 1 and 2. Alternatively, the split molds 1 and 2 may be formed by other methods.
In this case, two types of through holes 1A or 2A,
1B or 2B. That is, the split mold 1,
The through hole 1B or 2B located at the center of the mold 2 is formed to have the same diameter from one end to the other end (molding surface 1S or 2S), and the through hole 1A located at the outer peripheral side of the split molds 1 and 2 is formed. Or 2A
Is formed in a tapered shape toward the molding surface 1S or 2S side, and when the air is supplied as described above, the divided mold 1 shown in FIG.
Alternatively, the inner pressure is prevented from decreasing as the distance from the supply port 1K or 2K to 2 increases.

The tapered through hole 1A or 2A may be configured as shown in FIG. In other words, the first hole 1a or 2a having the same diameter from one end to the vicinity of the molding surface 1S or 2S at the other end communicates with the first hole 1a or 2a, and has a smaller diameter than the first hole 1a or 2a. The through hole 1A or 2A is constituted by the second hole 1b or 2b.

The process of forming a molded product using the split molds 1 and 2 will be described. By moving the two split molds 1 and 2 closer from the open state shown in FIG.
Make the mold clamping state shown in (b). By moving the electromagnetic valves 10 and 11 upward from the position shown in FIG. 1A in this mold clamping state, the release agent supplied from the release agent supply device 5 can be supplied to the supply flow paths 6A and 6B. And release of the release agent is started by operating the release agent supply device 5 and the release agent supplied from the release agent supply device 5 is passed through the holes of the split molds 1 and 2. Molding surface 1S
Alternatively, it can be applied from 2S to the other molding surface 2S or 1S. In FIG. 1B, the ejection state of the release agent is indicated by arrows, and the ejection direction and the ejection location of the release agent are determined by the size of the holes formed in the split molds 1 and 2. This is due to the number of sheaths and the like, and is not limited to those shown in the drawings. When the application of the release agent is completed, the operation of the release agent supply device 5 is stopped, and the electromagnetic valves 10 and 11 are moved from the position shown in FIG.
By moving the release agent downward as shown in (a), the release agent supplied from the release agent supply device 5 or the release agent retained in the second channel 8 and the third channel 9 is supplied. Road 6A, 6
The state is switched to a cutoff state in which supply to B is cut off.
Next, a molten resin is supplied into the molding space 4 from a molten resin supply device (not shown). When the molten resin filled in the molding space 4 solidifies, the electromagnetic valve 1
A state in which the supply air from the air supply device 3 can be supplied to the supply flow paths 6A and 6B by moving 0 and 11 downward from the position shown in FIG. 2A as shown in FIG. At the same time as starting the separation movement of the two split molds 1 and 2 or before starting the separation movement, the air supply device 3 is operated to start the supply of air, and the solidified molded product 17 is formed on the molding surface. The molded article 17 can be taken out by separating from 1S and 2S. In addition, FIG.
In the figure, arrows indicate the air blowing direction and the air blowing position, but are not limited to those shown in the drawings.

The release agent may be a powdery material such as zinc stearate, which is soluble at the mold temperature, a liquid such as silicone oil, or a solution or dispersion of the release agent in Freon or liquefied natural gas. A nebulized spray or the like will be used. As the release agent in the case of molten metal, as described above, in addition to black such as graphite, natural minerals such as talc, sericite, and limestone, or boron nitride, PTF
E (polytetrafluoroethylene) or the like in the form of a paint suspended in water containing a dispersant will be used. In the case of using a liquid such as the silicone oil or a spray in which a release agent is dissolved or dispersed in freon or liquefied natural gas, the flow paths 7, 8, 9, 6A,
The release agent may adhere to and accumulate on the inner surface of the channel 6B. However, if a powdery material such as the zinc stearate is used, the release agent adheres to the inner surface of the flow paths 7, 8, 9, 6A, and 6B. There is an advantage that deposition can be avoided. The molten resin is obtained by melting a synthetic resin material having moldability. The synthetic resin material includes a thermoplastic resin and a thermosetting resin, and various synthetic resins can be used.

The release agent supply circuit shown in FIG.
(B) and as shown in FIGS. 4 (a) and (b). That is, the electromagnetic valve 18 for switching between a state in which the release agent from the release agent supply device 5 is supplied to the second flow path 8 and the third flow path 9 and a state in which the release agent is not supplied is set to the first valve.
The second flow path 8 and the third flow path are interposed in the flow path 7, and the lower ends of the second flow path 8 and the third flow path 9 in the flow direction are joined to the supply flow paths 6A and 6B. An electromagnetic valve for switching the supply air from the air supply device 3 to the supply flow paths 6A and 6B and not supplying the supply air to the supply flow paths 6A and 6B by interposing a check valve 22 at a position on the downstream side in the flow direction of each of the paths 9. 19 and 20 are provided. The configuration that has not been described is the same as the configuration described above, and thus the description is omitted and the same reference numerals are given.

The process of forming a molded product using the release agent supply circuit will be described. From the state shown in FIG. 3A, as shown in FIG. The mold 2 is moved closer to the other fixed mold split mold 1 to be in a mold-clamped state, and the electromagnetic valves 18, 19, and 20 are switched as shown in FIG.
The mold release agent supplied through the molds 1 and 2S can be applied to the other molding surface 2S or 1S from one molding surface 1S or 2S through the holes of the split molds 1 and 2 using the supply air from the air supply device 3. I have. As described above, the ejection state of the release agent is indicated by arrows, and the ejection direction and the ejection location of the release agent are determined by the size and number of the holes formed in the split molds 1 and 2. Etc., and are not limited to those shown in the drawings. When the application of the release agent is completed, the electromagnetic valves 18, 19, and 20 are moved to FIG.
By switching from the position shown in FIG. 4 to the cutoff state as shown in FIG. 4A, the release agent supplied from the release agent supply device 5 is stopped from being supplied to the supply flow paths 6A and 6B. Become. Next, a molten resin is supplied into the molding space 4 from a molten resin supply device (not shown). When the molten resin filled in the molding space 4 is solidified, only the electromagnetic valves 19 and 20 are switched from the position shown in FIG. 4A to the supply position shown in FIG. Supply air from the supply device 3 is supplied to supply channels 6A and 6B.
And the air supply device 3 is started to supply air at the same time as the separation movement of one of the split molds 2 is started or before the separation movement is started, and the solidified molded product is started. 17 is detached from the molding surfaces 1S and 2S so that the molded article 17 can be taken out. In addition, similarly to the above, in FIG. 4 (b), arrows indicate the air blowing direction and the air blowing position, but are not limited to those shown in the figure.

FIGS. 3 (a) and 3 (b) and FIGS.
As shown in (b), the mold release agent is applied to the molding surfaces 1S and 2S using the supply air from the air supply device 3, so that the electromagnetic valve 18 is required. A pump or the like for supplying the release agent to the agent supply device 5 can be omitted, and the size of the device can be reduced. Further, by applying the release agent, the molded product 17 is released by the air from the air supply device 3 so that the release accumulated in the supply flow paths 6A and 6B and the split molds 1 and 2 can be achieved. The mold agent can be blown off to the outside, and the accumulation of the mold release agent in the supply flow paths 6A and 6B and the split molds 1 and 2 can be avoided. Further, by forming the split molds 1 and 2 so as to be movable close to and away from each other in a horizontal (left and right) direction, there is an advantage that the detached molded product 17 can be dropped downward, but there is an advantage in the vertical (vertical) direction. May be configured so as to be movable toward and away from each other.

[0022]

According to the first aspect of the present invention, by using a split mold made of a porous material having a large number of holes, a mold release agent is utilized by utilizing a large number of holes originally provided in the split mold. Can be supplied into the mold, the release agent can be evenly applied to the molding surfaces of the divided molds, and the molded article can be reliably removed from the mold. Moreover,
By using a configuration in which the release agent and the air are supplied to both split molds via a common pair of supply channels, the configuration can be simplified as compared with the case where separate supply channels are provided, It is possible to suppress an increase in the size of the apparatus, and it is possible to make the apparatus advantageous in terms of cost. Further, by using the common supply flow path, the release agent remaining in the supply flow path can be discharged from the split mold to the outside by air, and the release agent remaining in the supply flow path can be obtained. Does not solidify and does not cause clogging or the like in the supply flow path, and can be favorably used for a long period of time. In addition, since the molded product can be reliably separated from the mold only by the air pressure, the protruding pin as in the related art is not required. The configuration can be simplified by eliminating the need for a drive mechanism.

According to the second aspect, the size of the hole can be easily changed by forming the divided mold with a sintered metal as compared with a case where a through hole is formed in the divided mold by cutting or the like. And many small holes can be formed. Therefore, the release agent can be more evenly applied to the molding surfaces of the split molds, and the molded article can be more reliably separated from the molds.

According to the third aspect of the present invention, the release agent is applied to the molding surfaces of the two split dies using the air from the air supply device via the supply flow path. Can be omitted, and the size and cost of the apparatus can be reduced at the same time.

According to the fourth aspect, by supplying the air and the release agent from the minimum necessary molding surface,
By increasing the supply pressure, release of the molded article and application of the release agent can be performed more reliably. Further, since the supply pressure of the air supplied from the hole located on the side remote from the supply port can be suppressed from being lower than the supply pressure of the air supplied from the other holes, the air supply pressure can be reduced at any point. The supply pressure can be made substantially uniform, and the release of the molded article can be favorably performed, and the release agent can be evenly applied to the molding surface.

[Brief description of the drawings]

FIG. 1 shows a schematic diagram of a molding machine with a partial cross section,
(A) shows a mold open state, and (B) shows a state in which a mold release agent is supplied in a mold clamped state.

FIG. 2 shows a schematic view of a molding machine with a partial cross section,
(A) shows a state in which the molten resin is filled, and (B) shows a state in which the molded article is separated by air in an open state.

FIG. 3 is a schematic view of another embodiment of a molding machine in which a part is shown in cross section, (a) shows a mold open state, and (b) shows a state in which a mold release agent is supplied in a mold clamped state. Is shown.

FIG. 4 is a schematic view of another embodiment of a molding machine with a partial cross section, (A) shows a state in which a molten resin is filled, and (B)
Indicates a state in which the molded article is released by air in the mold open state.

FIG. 5 is a vertical sectional view showing the shape of a hole formed in a split mold.

FIG. 6 is a perspective view showing another example of the split mold.

FIGS. 7A and 7B are longitudinal sectional views showing two types of holes shown in FIG. 6;

FIG. 8 is a longitudinal sectional view showing another shape of a hole formed in a split mold.

[Explanation of symbols]

1 split mold 1A, 1B, 1C hole 1K supply port 1S forming surface 1a 1st hole 1b 2nd hole 2A, 2B, 2C hole 2K supply port 2S forming surface 2a 1st hole 2b 2nd hole 3 air Supply device 4 Molding space 5 Release agent supply device 6A, 6B Supply flow path 7 First flow path 8 Second flow path 9 Third flow path 10, 11 Electromagnetic valve 12 Fourth flow path 13 Fifth flow path 14 Sixth Channel 15 Metal case 17 Molded product 18, 19, 20 Solenoid valve 21 Check valve

Claims (4)

[Claims] 1. A pair of openable and closable split molds made of a porous material having a large number of holes, and a molded product solidified through the large number of holes of each of the split molds is separated from each split mold. An air supply device for supplying air, and a mold release before starting the filling of a molten metal material or a molten resin material into a molding space formed by the two split molds in a mold clamping state of the two split molds. Release agent supply device for applying the agent, and a common supply flow path for supplying the air from the air supply device and the release agent from the release agent supply device to each of the split molds. After applying the release agent from the release agent supply device to the molding surfaces of the two split dies through the supply flow path in the mold clamping state of the two split dies, respectively, the molding space After filling the inside with molten metal material or molten resin material and solidifying, open the mold A molding machine which discharges air from the air supply device to the outside from the molding surfaces of the two split dies through the supply flow path to separate the molded product. 2. The molding machine according to claim 1, wherein the split mold is formed of a sintered metal. 3. The method according to claim 1, wherein the release agent is applied to the molding surfaces of the two split molds via the supply flow path using air from the air supply device. Molding machine. 4. A size of a hole which is covered by a metal case on a surface excluding a molding surface of each of the divided dies, and is located on a side away from a supply port to each of the divided dies from each of the supply flow paths. 2. The molding machine according to claim 1, wherein the diameter of the hole is set smaller than that of the other holes.