JP3249198B2 - Thermosetting resin molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently and fully automatically molding a thermosetting resin molded article.

[0002]

2. Description of the Related Art Recently, various types of synthetic resin products such as engineering plastics have been widely used as industrial machine parts, but the performance required of synthetic resins as industrial machine parts is as follows. , Heat resistance, chemical resistance, dimensional stability, mechanical strength, wear resistance, and the like. In spite of the fact that thermosetting resins also originally have these properties, engineering plastics are generally regarded as thermoplastic resins. This means that the main method of molding thermosetting resin is compression molding, transfer molding, casting, etc., and although the technology related to injection molding has recently been developed, it is generally The reason for this is that productivity is extremely low because it takes time to cure the resin.

[0003] The thermosetting resin is a prepolymer having a relatively small initial molecular weight of about several hundreds to several thousands. However, the thermosetting resin is processed by blending a curing agent, a cross-linking agent and the like to reduce the reactivity of the prepolymer. Utilizing it, it forms a macromolecule having a three-dimensional structure in the molding process, is irreversibly cured by the formation of a three-dimensional network structure, and has a property of being hardly melted in a solvent even when reheated. Therefore, a liquid or powdered base material obtained by combining a thermosetting resin and various fillers is heated or reacted with a curing agent to thereby obtain the above-described abrasion resistance, heat resistance, and the like.
Since the molded product has characteristics such as chemical resistance and conductivity, it depends on the required characteristics of the molded product, and how many types of fillers are added and how many curing agents, lubricants, coloring agents, etc. Of course, there are also many combinations of these, and thermosetting resin molding involves the use of a wide variety of raw materials. In addition, the resin is cured by heating, so timing is efficient and efficient. There must be.

[0004] On the other hand, recently, the demand has been diversified and individualized, and the number of plastics molded products has increased due to the color tone, shape, application, specifications, and the like. Higher productivity and more efficient method than conventional molding method by work are required, and conventional molding line is fully automated and unmanned as much as possible in order to prevent labor shortage and work environment safety measures. There has been a strong demand for a line.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and turns service tanks individually suspended on a plurality of pivotable arms to sequentially move to various tables. To a dispensing station, where the contents in the service tank are injected into a mold placed on a moving trolley, and the moving trolley is transferred to a curing station to perform heat molding. It is an object of the present invention to provide a highly curable and efficient thermosetting resin molding system.

[0006]

Thermosetting resin molding method according to the present invention SUMMARY OF THE INVENTION In order to achieve the object, pivotable plurality of A - service was suspended in beam to each other - Bisutanku total
Quantity table, injection table, dispensing table, cleaning table
Table, and then weigh the prescribed resin and hardener with a metering / injection table and inject it into the service tank.
Discharge the service tank and cover the table with a vacuum dome from the table.
Tsu and payout stearyl - said moved in Deployment service - mode placing the resin and curing agent to the mobile carriage in Bisutanku - injected into field, cured by transferring the movable carriage on the automatic guided vehicle stearate -
Transfer to each curing oven, and apply mold under specified conditions.
Hardening / molding by pressing / heating, servicer with cleaning table
It is characterized by washing the ink .

[0007]

According to the thermosetting resin molding method of the present invention, the service tanks respectively suspended from a plurality of swivelable arms are swiveled and sequentially moved to the measuring table and the pouring table so as to be moved to the measuring / pouring table. Thermosetting resin, filler,
The curing agent, the coloring agent, etc. are measured and poured into the service tank and stirred, and the service tank is moved from the dispensing table to the dispensing station, where the thermosetting resin, the filler, and the like in the service tank are dispensed. Injecting a colorant or the like into a mold in the vacuum dome, the mold placed on the moving trolley is loaded on an automatic carrier, transferred to a curing station, heated and molded in a transferred curing furnace, After a lapse of a predetermined time, the movable trolley on which the mold is placed is returned to the automatic carrier, transferred to the release station, and the molded product is taken out of the mold using the mold, and the molded product is flown to the secondary curing line to be the final product. Molding. Also,
The service tank that has been emptied by injecting the thermosetting resin, filler, colorant, etc. into the mold is washed by the washing table, and the service tank after washing is moved to the measuring table again and the above operations are repeated. It is.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing the arrangement of each table and each station in the thermosetting resin molding method according to the present embodiment.
Reference numeral 61 denotes a transport path on which an automatic transport vehicle 62 loaded with a movable vehicle travels. A plurality of primary curing stations 63, 63,... Are disposed on both sides of the transport path 61, and are rotatable as described later. The service tanks 2, which are respectively suspended from the plurality of swing arms 1, 1,..., Are located within a swing range of the swing arm 1 adjacent to a payout station 60 arranged at the front end of the transport path 61. Weighing table 3 installed in
0, the injection table 31, the dispensing table 32, and the cleaning table 33 are sequentially moved, and the service tank 2 is moved from the dispensing table 32 to the dispensing station 60 by moving means described later.

On the other hand, at the rear end of the transport path 61, a sub-transport path 64 is provided through a turntable 68 at right angles to the transport path 61, and a release / assembly station 65 is provided on the auxiliary transport path 64. , A product take-out station 66 is provided. Further, a secondary curing line 67 is laid in the product removal station 66 in a direction orthogonal to the sub-transport path 64.

FIG. 2 is an explanatory view showing a case where a resin, a curing agent and the like are metered and poured into the service tank 2 in the measuring table 30. Reference numeral 1 denotes a plurality of swivel arms formed in a cross shape, for example. An annular hanging portion 3 is fixedly mounted at the tip of 1, 1,...
A flange is fixedly provided over the entire circumference of the side peripheral wall, and when the service tank 2 is loosely inserted into the annular hanging portion 3 by the flange, the service tank 2 is suspended from the hanging portion 3. Will be held.

The plurality of swing arms 1 are connected to a swing arm drive source 6 provided at the tip of a column 5 erected on a base 4, and actuate the drive source 6 to swing. Service tank 2 suspended at the tip of arm 1
To sequentially move the service tank 2 to the measuring table 30, the pouring table 31, the dispensing table 32, and the washing table 33 which are arranged on the circumference around the center of rotation of the rotating arm 1. It is something that goes. Reference numeral 7 denotes a storage tank disposed above the weighing table 30. Above the storage tank 7, a plurality of resin tanks 8 and filler tanks 9 are further disposed. Is connected to the storage tank 7. Reference numeral 10 denotes a filter attached to the bottom of the storage tank 7.

Reference numeral 11 denotes a weighing machine installed on the weighing table 30. A cylinder 12 for raising and lowering the weighing machine 11 is provided below the weighing machine 11, and a weighing machine 11 is provided above the weighing machine 11. Is a plurality of receiving portions 1 at equal intervals on the periphery.
A disk-shaped weighing plate 13 on which four, fourteen,... Are erected is attached, and the tips of the plurality of receiving parts 14, 14,. Are supported by the receiving portions 14, 14, ..., on the bottom side peripheral wall of the service tank 2. Therefore,
When the cylinder 12 is operated and the weighing machine 11 is raised,
The service tank 2 is supported by receiving plates 14, 14,... Standing upright on the periphery of a measuring plate 13 attached to the upper part of the weighing machine 11.
When the weighing device 11 and the weighing plate 13 are further raised, the service tank 2 supported by the weighing device 13 is also raised, and finally the service tank 2 is separated from the hanging portion 3 of the swing arm 1 to be in a free state. The weight of the tank 2 can be accurately measured by the weighing machine 11.

Although not shown, a tank for a hardening agent, a lubricant, or the like is provided above the injection table 31, so that the tank is measured and injected into the service tank 2 through a pipe. As shown in FIG. 5, a stirring blade 80 having a service tank lid 82 is provided above the injection table 31.
Is suspended from the ceiling by the cylinder 81 so as to be able to move up and down freely.
Is closed with the lid 82 and stirred. Also, the cleaning table 33
Although not shown, a tank for a cleaning liquid / solvent or the like is provided at the upper part of the apparatus, and a stirrer which can be moved up and down as described above is provided vertically. The service tank is washed while agitating with a stirring blade while spraying with a spray.

FIG. 3 shows a state in which the resin or the like in the service tank 2 is discharged to the mold 41.
The means for moving the service tank 2 from the payout table 32 to the payout station 60 will be described.
Is the payout table 32 and the payout station 6 described above.
And a support 17 which can be moved up and down by a driving source 16 fixedly mounted on a base provided between the support 17 and a support 17 at a tip end of the support 15 so as to be pivotable and a rear end of the support 17. Is provided with a support turning cylinder 18. A U-shaped arm 19 is fixedly provided at the tip of the support 17 (see FIG. 4).
The cylinders 20 and 20a are respectively attached to the arms opposite to each other.
Are provided to face each other, and the piston rods 2 of the cylinders 20 and 20a project through the inside of the U-shaped arm 19.
Semi-arc-shaped grips 21 and 21a are respectively attached to the tips of the two grippers 2 and 22a so that the grips 21 and 21a move forward by the operation of the cylinders 20 and 20a.
The reference numerals 1 and 21a move in directions approaching each other and operate so as to grip the service tank 2.

The drive source 16 is actuated to discharge the support 17 through the support column 15 and to lower the support 17 from above the table 32 so that the cylinders 20 and 20a provided on the U-shaped arm 19 of the support 17 are provided.
, The upper part of the side wall of the service tank 2 suspended on the turning arm 1 is gripped by the grips 21 and 21a, and the support 17 is raised by the driving source 16 via the support post 15, Pull out the service tank 2 from the suspension part 3 of the swing arm 1,
Next, the support pivoting cylinder 18 connected to the rear end of the support 17 is operated to pivot the support 17 so that the support 17 is held in the U-shaped arm 19 of the support 17. -Screw tank
2 is moved from the dispensing table 32 to a position directly above the dispensing station 60, and is supported by the grips 21, 21a of the arm 19 of the support 17 via the support 15 and the support 17. -The heat in the service tank 2 is applied to the mold 41 placed on the movable trolley 40 which descends the screw tank 2 and waits at the dispensing station 60.
Inject a curable resin or the like.

The dispensing station 60 is covered by a rectangular parallelepiped vacuum dome 43 having an opening 42 at an upper part and an openable / closable door (not shown) on the side of the transfer path 61. State. A gantry 44 is installed in the vacuum dome 43, and a cylinder 45 is disposed below the gantry 44. A piston rod 45a of the cylinder 45 projects through the gantry 44, and is provided at the tip thereof. A support base 46 is fixedly provided. In addition, the gantry 4
4, a rail 70 for the moving vehicle 40 is laid in a direction orthogonal to the transport path 61 on which the automatic transport vehicle 62 runs, and a rail is provided on the automatic transport vehicle 62 in a direction orthogonal to the transport path 61. Since the automatic transport vehicle 62 is laid, the automatic transport vehicle 62 stops at a predetermined position by a positioning device provided in the transport path 61, and the movable vehicle 40 is freely discharged from the automatic transport vehicle 62 via the rails 70 and 71. It is transferred to the gantry 44 of the station 60 and returns.

Reference numeral 41 denotes a molding mold fixed on an outer frame and placed on a movable carriage 40. The upper and lower surfaces of the mold 41 are covered with heat insulating materials 48, 48. A resin injection port 51 which opens at an acute angle is provided at the center of the upper part. A cylindrical projecting portion 52 is formed at the bottom of the service tank 2, and an extensible telescopic tube 47 is connected to the tip of the projecting portion 52. Is fixedly provided with an annular pressing plate 53. An injection pipe 54 is connected to a discharge pipe at the center of the bottom of the service tank 2. Therefore, by operating the support turning cylinder 18 provided at the rear end of the support 17, the service tank 2 gripped by the grips 21, 21 a of the U-shaped arm 19 at the tip of the support 17 is used to remove the support 17 from the discharge table 32. When the service tank 2 is turned down to the position just above the dispensing station 60 and the drive source 16 is operated to lower the service tank 2 through the column 15, the injection pipe 5 connected to the bottom of the service tank 2 is formed.
4 is inserted into the opening 42 of the vacuum dome 43.

At this time, an elastic push plate 53 is attached to the distal end of the telescopic tube 47 which is connected to the distal end of the cylindrical projection 52 formed at the bottom of the service tank 2. Therefore, the pressing plate 53 surrounds the upper opening 42 of the vacuum dome 43 and abuts on the upper surface of the vacuum dome 43, and the opening 42 of the vacuum dome 43 is completely sealed by the projection 52, the telescopic tube 47 and the pressing plate 53. As a result, the vacuum dome 43 is brought into a vacuum state by operating the vacuum pump 49.

On the other hand, when the cylinder 45 is operated, the support base 46 lifts the movable carriage 40, and the mold 41 mounted on the movable carriage 40 also rises, and the injection pipe 54 connected to the bottom of the service tank 2 described above. Is inserted into the resin injection port 51 of the mold, and the resin in the service tank 2 is discharged to the mold 41. The reason why the above-mentioned dispensing station 60 is covered with the vacuum dome 43 and the vacuum state is maintained is that the resin contained in the liquid resin is completely defoamed and the resin is injected into the corner portion of the mold 41. This is to increase the strength of the molded article so that a so-called "nest" does not occur.

FIG. 6 is a schematic view of the primary curing station 63. The movable carriage 40 loaded with the mold 41 which has received the resin and the like at the dispensing station 60 is transferred from the gantry 44 of the dispensing station 60 to the automatic transfer carriage 62. And
The automatic transport trolley 62 loaded with the movable trolley 40 is transported by a transport path 61.
Travel along to move to the primary curing station 63,
The above-mentioned movable cart 40 is transferred from the automatic transport cart 62 to the curing furnace 75 of the primary curing station 63. Mobile trolley 4
The transfer from the gantry 44 of the dispensing station 60 to the automatic transport trolley 62 or the transfer / return of the movable trolley 40 from the automatic transport trolley 62 to the primary curing station 63 has already been carried on the automatic transport trolley 62. Known push
The pulling device is used, and a positioning device is also installed in the transport path 61. Therefore, the transfer cart 40 can accurately transfer the payout station 60 from the gantry 44 or transfer / return to the primary curing station 63. Is what is done.

The curing furnace 75 of the above-mentioned primary curing station 63 has a rectangular parallelepiped shape with its periphery covered with a heat insulating material, and a door that can be opened and closed is provided on the side of the curing furnace 75 facing the transport path 61. Cylinders 76 and 76a are fixed to both outer walls of the curing furnace 75, respectively.
At the tip of the piston rod 76a, heating plates 77, 77a for heating one side wall of the mold 41 at a predetermined temperature are fixed, and the heating is performed by a heating device (not shown) installed outside the furnace.
The heating method is not particularly limited.

Reference numeral 74 denotes a driving source disposed above the curing furnace 75. When the driving source 74 is operated, a pressure plate 78 disposed above the curing furnace 75 is moved down to move the moving carriage 40. It comes into close contact with the upper surface of the placed mold 41. Reference numeral 73 denotes a compressed air pipe penetrating the compressed air plate 78.
Is projected below the compressed air plate 78. Also, 7
Reference numeral 2 denotes a rail for the movable carriage 40 laid in the curing furnace 75.

Therefore, at the dispensing station 60, the movable carriage 40 loaded with the resin-injected mold 41 is loaded.
Is transferred from the gantry 44 to the automatic transport vehicle 62, which travels along the transport path 61 to the primary curing station 63, where the door of the curing furnace 75 is opened and the mold 41 is loaded. The carriage 40 is transferred into the curing furnace 75. Subsequently, the door of the curing furnace 75 is closed, the drive source 74 is operated to lower the compressed air plate 78, the mold 41 is pressed by the compressed air plate 78, and the pressure is applied by the compressed air pipe 73 to the injection port. The stagnant resin is completely injected into the mold, and the resin is poured into each corner of the mold so as to prevent a "nest" due to thermal shrinkage of the resin molded product.

On the other hand, the cylinders 76 and 76a fixed to both outer walls of the curing furnace 75 are operated to press both side walls of the mold 41 with the heating plates 77 and 77a to heat the mold 41 to a predetermined temperature. As described above, since the thermosetting resin starts to be cured by heating, it is cured by heating while partially inclining the mold so that distortion does not occur while considering the shape and thickness of the molded product. Will be promoted. After the mold is heated for a predetermined time to cure the resin, the door of the curing furnace 75 is opened, and the movable carriage 40 on which the mold is placed is returned to the automatic carrier 62, and the automatic carrier 62 is moved on the transport path 61. The traveling direction is changed by 90 degrees by the turntable 68, and the transfer is carried to the release / assembly station 65 along the sub-transport path 64.

The above-mentioned turntable 68 is provided with a known drive source, a rotary encoder and the like, and is not particularly limited. Further, at the release / assembly station 65, the moving mold among the molds is removed from the fixed mold by a mechanical method, and the automatic transporting trolley 62 moves to the product removal station 66, where the product is removed from the fixed mold at the station. Remove and remove unnecessary burrs. The product taken out is transferred to a pallet, set at a predetermined temperature,
It flows through the next curing line for a predetermined time and is finally cured. In the secondary curing line, various jigs / frames are attached to the molded product so that the molded product does not bend or deform. The molded product after the completion of the secondary curing is cooled by natural heat radiation, and the molding is completed.

Although not shown, the movable carriage 40, the automatic transport carriage 62, the swing arm 1, the support 17 and the like are provided with positioning devices, and stop at predetermined positions. Attached to the solenoid valve,
Cylinders, weighing machines, heating devices, pressurizing means, etc. are all connected to the central control unit, so that resin, filler, curing agent, colorant, etc. are specified and weighed for each molded product under computer control, and Since the heating conditions and the molding conditions are also set automatically, all the molding is performed automatically and efficiently. Further, in the present embodiment, four service tanks are suspended from the four swiveling arms, but the number and the like are not limited.

As described above, it takes a considerable amount of time to cure the thermosetting resin. However, if the method shown in this embodiment is used, the resin, filler, curing agent, coloring agent, etc. , Each is weighed and poured into a service tank, and the service tank is moved from a payout table to a payout station, where the resin, filler, hardener, the coloring agent mode - injected into field <br/>, the mode - field and stacked on the automatic transport vehicle bringing the curing furnace, the very efficient ones for molding by heating a predetermined time, curing furnace Yes, with high productivity.

[0028]

The thermosetting resin molding system according to the present invention comprises:
Each service tank is hung on a plurality of swivelable arms, and the service tank is swiveled to move sequentially to a measuring / injection table to measure a predetermined resin, filler, hardener, colorant, etc. Then, the service tank is swiveled to the dispensing table, the service tank on the dispensing table is moved to the dispensing station, and the resin, filler, and hardened resin in the service tank are molded into the mold in the vacuum dome. Dispensing agents and coloring agents.

Since the above-mentioned mold is mounted on a movable carriage, the movable carriage is loaded on an automatic carrier carriage and transported to a curing station, and the mold is transferred to a curing furnace, and the mold is placed in the furnace. In the conventional method of molding a thermosetting resin, the steps of weighing, casting, primary curing release, and secondary curing of the raw material are exclusively performed manually. However, in the molding method according to the present invention, since all of these steps are performed by automation, productivity is much higher than before, which greatly contributes to labor saving, relief from dangerous work, and stable product quality. Especially for each product
It is a suitable molding method for multi-product molding with different specifications such as fillers, hardeners and colorants, and has a remarkable effect on the industrial world.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the arrangement of each work table and work station.

FIG. 2 is an explanatory diagram of a weighing table.

FIG. 3 is an explanatory view of a state where resin is discharged from a service tank to a mold.

FIG. 4 is an explanatory view of a service tank gripping part.

FIG. 5 is an explanatory view of a stirring unit.

FIG. 6 is an explanatory view of a primary curing station.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Swivel arm 2 Service tank 3 Hanging part 30 Weighing table 31 Injection table 32 Dispensing table 33 Cleaning table 40 Moving trolley 41 Mold 43 Vacuum dome 60 Dispensing station 61 Transport path 62 Automatic transport trolley 63 Primary curing station 64 Secondary transport path 65 Release / assembly station 66 Product unloading station

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-289315 (JP, A) JP-A-2-196611 (JP, A) JP-A-63-212519 (JP, A) JP-A-57- 169338 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 39/02-39/06 B29C 39/22-39/44 B29C 31/02-39/10 B29C 43/04 -43/08 B29C 43/32-43/34

Claims (1)

(57) [Claims] 1. A measuring tank , a pouring table , and a dispensing service tank separately suspended from a plurality of pivotable arms.
To the cleaning table and the cleaning table,
Measure the specified resin and curing agent in the input table and
The mold is poured into a service tank, the service tank is moved from the delivery table to a delivery station covered with a vacuum dome, and the resin and the curing agent in the service tank are placed on a movable carriage. And the movable cart is transferred to an automatic carrier and transferred to each curing furnace of a curing station to be moated.
Press and heat the mold under specified conditions to cure and mold, then wash
A thermosetting resin molding method characterized by cleaning a service tank with a table .