JPH05161941A - Method for assembling lost foam pattern and device therefor - Google Patents

Abstract

PURPOSE:To automatically assemble a treelike lost foam pattern by meet- sticking the prescribed number of unit patterns corresponding to twigs or leaves to a sprue corresponding to a trunk. CONSTITUTION:This device is provided with an injection forming mechanism 11 for forming the unit pattern by the injection formation, sprue axial direction shifting mechanism 41 and/or sprue peripheral direction shifting mechanism 61 for shifting the performed sprue 2 in the axial direction and/or the peripheral direction of this sprue 2 at the melt-sticking position P of the unit pattern by the interval between the unit patterns, unit pattern shifting mechanism 21 for approaching and press-sticking the injection-formed unit pattern to the sprue 2 by shifting the unit pattern from the injection forming position to the melt-sticking position P, wax gate part cut-off mechanism 31 for cutting off the wax gate part of the unit pattern while the unit pattern is shifted from the injection-forming position to the melt-sticking position P and heated body shifting mechanism 51 for shifting a heated body to the melt-sticking position P by partially heating and melting at least one side of the sprue 2 and the unit pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling extinction model used for assembling a tree-like extinction model by welding a predetermined number of unit models corresponding to branches or leaves to a sprue corresponding to a trunk. The present invention relates to a method and an assembly device.

[0002]

2. Description of the Related Art Conventionally, as one of precision casting methods, there is a method using a disappearing model, and among them, the lost wax method using wax as a disappearing material is widely adopted.

In the lost wax method, a predetermined number of unit models produced by an injection molding machine such as an injection machine using wax, which is a disappearing material, are welded to a sprue to form a tree-like disappearing model, and slurry is attached. , Stuccoing (sanding) and drying are repeated multiple times to form a refractory coating consisting of multiple layers, dried, heated and dewaxed, and then fired to obtain a ceramic shell mold with enhanced mold strength. This is a precision casting method in which a molten metal is poured into this mold and then solidified, the mold is removed and the sand is removed to obtain a tree-shaped cast body, which is then cut into individual cast parts.

In such a lost wax method, as described above, it is necessary to weld a predetermined number of unit models corresponding to branches or leaves to a sprue corresponding to a trunk to assemble it into a tree-like disappearing model. In the conventional case, a worker uses a heated iron to manually perform the operation one by one.

Further, in order to improve the deterioration of the workability due to such a manual work, a unit in which a plurality of wax models are integrally molded around a metal cylindrical assembly unit in one cylindrical porous runner rod. A method has also been proposed in which models are sequentially fitted and adhered to each other to assemble into a disappearing model (for example, Japanese Patent Publication No. 63-9901).

[0006]

However, in the above-mentioned assembling method, each unit model is constructed by adhering each wax model by causing the wax to flow out from the hole provided in the metal cylindrical assembly unit. Since these unit models were fitted into the cylindrical porous runner rod, positioning of the metal cylindrical assembly unit, outflow of wax from the holes provided in the metal cylindrical assembly unit, and hot water of the unit model There is a problem that many processes such as fitting into the rod are required, and the use of non-dissipative materials such as metal cylindrical assembly units also increases, and the number of wax models depends on the production volume. The cylindrical assembly made of non-disappearing material has a problem that it is difficult to set the assembly density arbitrarily. Or using the knit, the development of the assembly method and apparatus for assembling a them there is no need to Dari fitted to the runner bar simple fugitive pattern has been a problem.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and a sprue corresponding to a trunk is provided with a branch or a sprue without incorporating a non-erasable member such as a metal unit member into a disappearing model. An object of the present invention is to provide an assembling method and an assembling apparatus for a fusible model capable of automatically welding and assembling a predetermined number of unit models corresponding to leaves.

[0008]

In the method of assembling a fugitive model according to the present invention, a sprue corresponding to a trunk is welded with a predetermined number of unit models corresponding to branches or leaves to be assembled into a fugitive tree-like model. At this time, take out the unit model molded by injection molding from the injection mold, cut off the unnecessary wax gate part of the unit model, and move to the welding position on the sprue, and at least one of the unit model and the sprue Unit model and sprue are welded together by heat, and after splicing, the sprue is moved axially and / or circumferentially by the distance between the unit models, and the next unit model molded by injection molding is injection molded. After removing it from the mold and cutting off the wax gate part of the unit model, move it to the welding position on the sprue, Welded to the unit model and sprue at least one of the knit model and sprue partially heated and melted, the axial direction and the sprue after welding /
Alternatively, the unit model is moved in the circumferential direction by the distance between the unit models, the next unit model molded by injection molding is taken out from the injection mold, the wax gate portion of the unit model is cut off, and then the unit model is moved to the welding position on the sprue. It is characterized in that a predetermined number of unit models are welded in a tree shape on the sprue by repeating the process.

The disappearing model assembling apparatus according to the present invention is an apparatus for assembling a tree-like disappearing model by welding a predetermined number of unit models corresponding to branches or leaves to a sprue corresponding to a trunk. , An injection molding mechanism for molding a unit model by injection molding, and a sprue axial movement mechanism for intermittently moving a pre-molded sprue at the welding position of the unit model in the axial direction and / or the circumferential direction of the unit model by the distance between the unit models. And / or a sprue circumferential movement mechanism, and a unit model movement mechanism that moves the injection-molded unit model from an injection molding position to a welding position so as to approach or crimp the sprue.
A wax gate part cutting mechanism for cutting the wax gate part of the unit model while moving the unit model from the injection molding position to the welding position by the unit model moving mechanism, and at least one of the sprue and the unit model is partially The present invention is characterized in that a heating body moving mechanism for moving a heating body to be heated and melted to the welding position is provided, and in the embodiment, an injection molding mechanism, a unit model moving mechanism, a wax gate partial cutting mechanism, a sprue axial direction. Injection molding mechanism control unit, unit model movement mechanism control unit, wax gate partial cutting mechanism control unit, sprue axial direction that transmits necessary control commands to the moving mechanism and / or the sprue circumferential direction moving mechanism and the heating body moving mechanism, respectively. Moving mechanism controller and / or sprue circumferential moving mechanism In the same embodiment, the injection molding mechanism includes a knockout for removing the unit model from the injection mold, the sprue axial movement mechanism includes a uniaxial robot, and the sprue circumference. The direction moving mechanism is equipped with a stepping motor, the unit model moving mechanism is equipped with a horizontal articulated robot, the wax gate partial cutting mechanism is equipped with a cutter, and the heating body moving mechanism is equipped with a simultaneous three-axis robot. The structure of the invention relating to the method and apparatus for assembling the vanishing model described above serves as means for solving the above-mentioned conventional problems.

[0010]

In the state in which the pre-molded sprue is moved and positioned at the welding position of the unit model by the sprue axial movement mechanism, the unit model injection-molded by the injection molding mechanism is taken out from the injection mold and the unit model is removed. The moving mechanism moves the unit model to a welding position with the sprue, and during this movement, the wax gate part cutting mechanism cuts the wax gate part of the unit model into a state close to or crimped to the sprue. The heating element is moved to a proximity portion or a crimping portion of the sprue and the unit model by a moving mechanism to partially heat and melt at least one of the sprue of the proximity portion or the crimping portion and the unit model, and the sprue and the unit model. Because and are crimped The unit model is welded to a predetermined position of the sprue after solidification.

Then, the sprue axial movement mechanism moves the sprue axially by the distance of the unit model, and the next unit model injection-molded by the injection molding mechanism is taken out from the injection molding die and moved by the unit model movement mechanism. The unit model is moved to the welding position with the sprue, and during this movement, the wax gate part of the unit model is cut by the wax gate part cutting mechanism to be in the state of being close to or crimping to the sprue, and by the heating body moving mechanism. The heating element is moved to a proximity portion or a crimping portion of the sprue and the unit model to partially heat and melt at least one of the sprue and the unit model of the proximity portion or the crimping portion, and the sprue and the next unit model. By pressing, the sp It is welded to a predetermined position of the over.

Subsequently, the sprue axial movement mechanism moves the sprue axially by the distance of the unit model, and the unit model injection-molded by the injection molding mechanism is welded every injection molding in the same manner as described above. Thereby, a plurality of unit models are welded in the axial direction of the sprue.

When a plurality of unit models are also welded in the circumferential direction of the sprue, the sprue circumferential moving mechanism moves the sprue in the circumferential direction by the distance between the unit models, and in this state the same as above. A plurality of unit models that are injection-molded by the injection molding mechanism are welded in the axial direction of the sprue for each injection molding.

In this manner, a plurality of unit models are welded and fixed in the axial direction of the sprue, and if necessary, a plurality of unit models are also welded in the circumferential direction of the sprue, and a predetermined number of unit models are welded by the sprue. During this process, the injection molding mechanism control unit, sprue axial direction movement mechanism control unit, unit model movement mechanism control unit, wax gate partial cutting mechanism control unit, heating body movement mechanism control unit, sprue circumferential movement are assembled. An injection molding mechanism, a sprue axial movement mechanism, a unit model movement mechanism,
By transmitting the necessary control commands to the wax gate part cutting mechanism, the heating body moving mechanism, and the sprue circumferential moving mechanism, the unit model injection molding mode, the sprue axial moving mode, the unit model moving mode, and the wax gate part moving mode It is also possible to make the cutting mode, the heating body moving mode, and the sprue circumferential moving mode more accurate and reliable.

As a result, a predetermined number of unit models corresponding to branches or leaves are automatically welded to the sprue corresponding to the trunk, and manpower is not required to assemble the disappearing model. In addition, since a metal assembly unit is not required, such a metal assembly unit that is a non-disappearing member does not form a part of the dissipative model.

Further, in the above description, the case where a plurality of unit models are welded in the axial direction of the sprue and then the sprue is rotated by a predetermined amount in the circumferential direction has been described. Needless to say, the sprue may be moved by a predetermined amount in the length direction after individual welding.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the entire structure of an assembling model of an extinguishable model used for carrying out a method for assembling an extinguishing model according to the present invention. As shown in FIG. 6, the sprue 2 corresponding to a trunk is welded with a predetermined number of unit models 3 corresponding to branches or leaves to be used for assembling into a tree-shaped vanishing model 4.

As shown in FIG. 1, the disappearance model assembling apparatus 1 moves an injection molding machine 11 as an injection molding mechanism for molding a unit model 3 by injection molding and the unit model 3 to a welding position P. Then, the horizontal articulated robot 21 as a unit model moving means for approaching or crimping to the preformed sprue 2 and the unit model 3
A cutter 31 as a wax gate part cutting mechanism for cutting the wax gate part of the unit model 3 while the horizontal articulated robot 21 moves from the injection molding position to the welding position P, and the sprue 2 for the unit model 3 The uniaxial robot 41 as a sprue axial movement mechanism that moves the sprue 2 in the axial direction at the welding position P, and at least one of the sprue 2 and the unit model 3 that are in the proximity or pressure contact state is partially heated. Simultaneous triaxial robot 51 as a heating body moving mechanism for moving the melting heating body to the welding position P, and sprue circumferential movement for moving the sprue 2 at the welding position P of the unit model 3 in the circumferential direction of the sprue 2. A stepping motor 61 as a mechanism is provided, and an injection molding mechanism (an injection molding mechanism) is used as a control system. 11), unit model moving mechanism (horizontal articulated robot) 21, wax gate partial cutting mechanism (cutter) 31, sprue axis direction moving mechanism (uniaxial robot) 41, heating body moving mechanism (simultaneous three-axis robot) ) 51, a sprue circumferential movement mechanism (stepping motor) 61, an injection molding mechanism control unit 71a for transmitting necessary control commands, a unit model movement mechanism control unit 71b, and a wax gate partial cutting mechanism control unit 71c.
, A control unit 71 having a sprue axial direction movement mechanism control unit 71d, a heating body movement mechanism control unit 71e, and a sprue circumferential direction movement mechanism control unit 71f.

Among these, in the injection molding machine 11 as the injection molding mechanism, as shown in FIGS. 1, 2 and 5, the injection molding main body 13 provided with the injection molding nozzle 12 has the injection molding mold 14 The molten wax sprayed from the injection molding nozzle 12 in the close state enters the molding space of the injection mold 14 through the wax gate portion 15. There is.

The injection mold 14 is movable in the left-right direction in the drawing, and the unit model 3 can be detached from the injection mold 14 by a knockout 16 at the right end side in the moving direction.

Further, the horizontal articulated robot 21 as a unit model moving mechanism for moving the unit model 3 to the welding position P so as to approach or crimp the sprue 2, as shown in FIGS. The unit model 3 having the holding arm portion 22 and removed from the injection mold 14 by the knockout 16 is welded to the welding position P.
The sprue 2 can be moved in a direction in which the sprue 2 can be moved to a position close to or crimped.

A cutter (not shown) as a wax gate part cutting mechanism for cutting the gate part of the unit model 3 while the unit model 3 is moved from the injection mold 14 to the welding position P by the horizontal articulated robot 21. The gate portion is cut off by (having one or a pair of slide blades) 31.

On the other hand, a uniaxial robot 41 as a sprue axial moving mechanism for moving the preformed sprue 2 in the axial direction of the sprue 2 at the welding position P of the unit model 3 is as shown in FIGS. 1 and 4. The holding unit 42 for the sprue 2 of the vacuum system is provided, and the sprue 2 held by the holding unit 42 is movable so as to be movable in its axial direction.

Further, the simultaneous triaxial as a heating member moving mechanism for moving a heating member for heating and melting at least one of the sprue 2 and the unit model 3 which are in proximity or in pressure contact to the welding position P. Robot 51
As shown in FIG. 1 and FIG.
2 has a trowel holding portion 53 for holding the heated trowel 52 so that the heated trowel 52 can be moved between the sprue 2 and the unit model 3 or between the sprue 2 and the unit model 3. It is moving. The trowel 52 can be selected from two directions, from the left side indicated by the solid line and the right side indicated by the phantom line, depending on the shape of the unit model 3 and the like. Further, this heating member moving mechanism may be provided with a hot air blower for removing the molten wax remaining in the portion of the iron 52 as a heating member.

When assembling the vanishing model 4 as shown in FIG. 6 using the vanishing model assembling apparatus 1 having such a structure, the sprue 2 formed in advance is used.
However, in a state where the unit model 3 is moved and positioned at the welding position P of the unit model 3 by the uniaxial robot 41 which is the sprue axial direction moving mechanism, the unit model 3 injection-molded by the injection molding machine 11 which is the injection molding mechanism is injected by the knockout 16. The wax model is removed from the mold 14 and the unit model 3 is held by the holding arm part 22 of the horizontal articulated robot 21, which is a unit model moving mechanism, and is moved toward the welding position P with the sprue 2 in the wax gate part. After the wax gate portion is cut off by the cutter 31 which is a cutting mechanism, the wax gate portion is moved to the welding position P and brought into a state in which the sprue 2 is brought into close proximity or pressure-bonded to the sprue 2. The iron 52 is located near the sprue 2 and the unit model 3 or The sprue 2 and the unit model 3 are moved to the crimping part and partially heat and melt at least one of the sprue 2 and the unit model 3 of the proximate part or the crimping part. The unit model 3 is welded to a predetermined position of the sprue 2.

Then, the sprue 2 is moved axially by the distance between the unit models 3 by the uniaxial robot 41, which is a sprue axial movement mechanism, and the next unit model 3 molded by the injection molding machine 11 is injected by the knockout pin 16. The holding arm unit 2 of the horizontal articulated robot 21 which is removed from the molding die 14 and is a unit model moving mechanism.
2, the wax gate portion is cut off by the cutter 31 while being moved toward the welding position P with the sprue 2 and then the sprue 2 is brought into close proximity or pressure-bonded state. The trowel 52, which is a heating body, is moved by the axis robot 51 to a proximity portion or a crimping portion of the sprue 2 and the unit model 3 so that at least one of the sprue 2 and the unit model 3 of the proximity portion or the crimping portion is partially moved. It is heated and melted, and the sprue 2 and the unit model 3 are pressure-bonded to each other, so that the sprue 2 is welded to a predetermined position after being solidified.

Then, each time the sprue 2 is axially moved by the distance between the unit models 3 by the uniaxial robot 41 which is the sprue axial movement mechanism, and the unit models 3 are injection-molded by the injection molding machine 11 in the same manner as described above. By welding the unit model 3 to the sprue 2, a plurality of unit models 3 are welded in the axial direction of the sprue 2.

When a plurality of unit models 3 are also welded in the circumferential direction of the sprue 2, the sprue 2 is moved in the circumferential direction by an interval of the unit models 3 by a stepping motor 61 which is a sprue circumferential moving mechanism. In this state, a plurality of unit models 3 are welded in the circumferential direction of the sprue 2 every time the unit model 3 is injection molded by the injection molding machine 11 in the same manner as described above.

In this way, a plurality of unit models 3 are fixed by welding in the axial direction of the sprue 2, and if necessary, a plurality of unit models 3 are also welded in the circumferential direction of the sprue 2 by a predetermined number. 3 is assembled to the extinguishing model 4 welded to the sprue 2, and during this time, the injection molding mechanism control unit 71
a, unit model moving mechanism control unit 71b, wax gate partial cutting mechanism control unit 71c, sprue axial direction movement mechanism control unit 71d, heating body movement mechanism control unit 71e, sprue circumferential direction movement mechanism control unit 71f, respectively, injection molding The mechanism is an injection molding machine 11, the unit model moving mechanism is a horizontal articulated robot 21, the wax gate partial cutting mechanism is a cutter 31, the sprue axis direction moving mechanism is a uniaxial robot 41, and the heating body moving mechanism is simultaneous three-axis. The injection molding machine 11 transmits the necessary control commands to the robot 51 and the stepping motor 61, which is a sprue circumferential movement mechanism.
By injection molding, moving unit model 3, cutter 31
More accurate and reliable control of the cutting by means of, the axial movement of the sprue 2, the movement of the iron 52 as a heating body, the circumferential movement of the sprue 2 and the like. Then, the completed tree-shaped vanishing model is transferred to the stock section 80 having a moving means in the arrow direction.

As a result, a predetermined number of unit models 3 corresponding to branches or leaves are automatically welded to the sprue 2 corresponding to the trunk, and no manpower is required to assemble the disappearing model 4. Becomes Further, since a metal assembly unit is not required, the metal assembly unit which is a non-disappearing member does not form a part of the dissipative model.

In the above embodiment, the sprue 2
Although the case where the sprue 2 is rotated by a predetermined amount in the circumferential direction after the plurality of unit models 3 are welded in the axial direction of the sprue 2 is shown, after the plurality of unit models 3 are welded in the circumferential direction of the sprue 2, the sprue 2 May be moved in the axial direction by a predetermined amount.

[0032]

According to the method and apparatus for assembling a disappearing model according to the present invention, a sprue corresponding to a trunk is branched without incorporating a non-disappearing member such as a metal unit member into the disappearing model. Or, it is possible to automatically weld and assemble a predetermined number of unit models corresponding to leaves, starting from its molding, and the workability in assembling a tree-shaped disappearing model is remarkably improved. Great effect is brought about.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing the overall structure of an apparatus for assembling a vanishing model according to the present invention.

FIG. 2 is a schematic view of the disappearance model assembling apparatus according to the present invention.
It is a plane explanatory view mainly showing a portion of an injection molding mechanism.

FIG. 3 is a schematic view of the disappearance model assembling apparatus according to the present invention.
It is a plane explanatory view mainly showing a portion of a welding position and a heating element moving mechanism.

FIG. 4 is a view showing an assembling apparatus of a disappearing model according to the present invention,
It is a plane explanatory view mainly showing a portion of a sprue axial direction moving mechanism and a sprue circumferential direction moving mechanism.

FIG. 5 is a schematic view of the disappearance model assembling apparatus according to the present invention.
It is a side surface explanatory view mainly showing a portion of an injection molding mechanism.

FIG. 6 is an explanatory view schematically showing an example of the disappearance model.

[Explanation of symbols]

 1 Disappearance model assembling device 2 Sprue 3 Unit model 4 Disappearance model 11 Injection molding mechanism (injection molding machine) 21 Unit model moving mechanism (horizontal articulated robot) 31 Wax gate partial cutting mechanism (cutter) 41 Sprue axial movement Mechanism (1 axis robot) 51 Heated body moving mechanism (simultaneous 3 axis robot) 61 Sprue circumferential direction moving mechanism (stepping motor) 71 Control mechanism (control section)

Claims (4)

[Claims] 1. When assembling a tree-shaped disappearing model by welding a predetermined number of unit models corresponding to branches or leaves to a sprue corresponding to a trunk, a unit model molded by injection molding is taken out from an injection mold. After removing the wax gate part of the unit model, move to the welding position on the sprue, heat and melt at least one of the unit model and the sprue to weld the unit model and the sprue, and after welding, remove the sprue. The unit model moves axially and / or circumferentially by the distance between unit models, and the next unit model molded by injection molding is taken out from the injection mold and the wax gate part of the unit model is cut off and then welded to the sprue. Move to position and partially heat and melt at least one of the unit model and sprue Then, the unit model and the sprue are welded, and after the welding, the sprue is moved axially and / or circumferentially by the distance between the unit models, and the next unit model molded by injection molding is taken out from the injection mold. A method for assembling a fusible model, which comprises cutting a wax gate portion of the unit model and then moving it to a welding position on the sprue to weld a predetermined number of unit models to the sprue in a tree shape. 2. A device for assembling a predetermined number of unit models corresponding to branches or leaves to a sprue corresponding to a trunk and assembling it into a tree-shaped disappearing model, which is an injection molding mechanism for molding a unit model by injection molding. And a sprue axial movement mechanism and / or a sprue circumferential movement mechanism for intermittently moving the preformed sprue in the welding position of the unit model in the axial direction and / or the circumferential direction of the sprue by the distance of the unit model, and the injection. A unit model moving mechanism for moving the molded unit model from the injection molding position to the welding position so as to approach or crimp the sprue, and to move the unit model from the injection molding position to the welding position by the unit model moving mechanism. A wax gate part cutting mechanism for cutting the wax gate part of the unit model An apparatus for assembling a fusible model, comprising: a heating body moving mechanism that moves a heating body that partially heats and melts at least one of the sprue and the unit model to the welding position. 3. An injection molding mechanism, a unit model moving mechanism,
Wax gate partial cutting mechanism, sprue axial direction moving mechanism and / or sprue circumferential direction moving mechanism, and injection molding mechanism control unit, unit model moving mechanism control unit, wax gate for transmitting necessary control commands to the heating body moving mechanism, respectively Partial excision mechanism control unit, sprue axial movement mechanism control unit and / or sprue circumferential movement mechanism control unit,
The apparatus for assembling a fugitive model according to claim 2, further comprising a heating body moving mechanism controller. 4. The injection molding mechanism includes a knockout for removing a unit model from an injection mold, the sprue axial direction moving mechanism includes a uniaxial robot, the sprue circumferential direction moving mechanism includes a stepping motor, and the unit model moving mechanism includes a horizontal multi-axis mechanism. The disappearance model assembling apparatus according to claim 2, further comprising a joint robot, the wax gate partial cutting mechanism including a cutter, and the heating body moving mechanism including a simultaneous three-axis robot.