JP2009029072A - Molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding device where the speed at which the material to be molded is injected from a storage chamber into a cavity and that at which the air in the cavity is exhausted can be easily synchronized. <P>SOLUTION: A first communicating conduit 41 is formed at the holder 17 of a lower die unit 16 mounted operably so as to be elevated by a hydraulic cylinder 12, and one end opening 41a thereof is formed at the upper face 17a of the holder 17. A cylinder chamber 42 on the rod side in the hydraulic cylinder 12 and the other opening 41b of the first communicating conduit 41 are communicated by flexible piping 43. To an upper die unit 22, a second communicating conduit 44 in which one end is opened 44a to the lower face 23a of a holder 23, and the other end is opened 44b to the molding face 24b of the upper die 24 is formed. When the upper die unit 22 is lowly operated, so as to be matched to the lower die unit 16, and, in a state where the second communicating conduit 44 and the first communicating conduit 41 are communicated, both the die units 16, 22 are moved to the lower part, the air in the cavity is sucked by the increase of the volume of the cylinder chamber 42 on the rod side in the hydraulic cylinder 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molding apparatus.

  Conventionally, what was disclosed by patent document 1 as a shaping | molding apparatus is proposed. In this molding apparatus, a lower mold is mounted on a bed through a hydraulic cylinder so that the lower mold can be moved up and down, and an upper mold is mounted by a lifting mechanism so that the lower mold can be moved up and down. The molding material storage chamber communicated with the cavity is provided. Further, the molding apparatus inserts an extrusion rod mounted upward on the bed into the storage chamber, lowers the upper mold and aligns it with the lower mold, and then lowers both molds at the same time, thereby storing the storage. The molding material of the chamber is configured to be extruded into the cavity by the push rod.

When the material to be molded is extruded from the storage chamber into the cavity by the extrusion rod, if the air in the cavity is not discharged to the outside, a nest is formed in the molded product by the air pocket. A discharge device is provided. This air discharge device is connected to the communication pipe when the upper mold is lowered by connecting a vacuum pump to the opening of the communication path formed so as to communicate with the cavity in the upper mold. The amount of air discharged from the cavity is controlled by controlling the opening / closing of the electromagnetic on-off valve to control the amount of air sucked by the vacuum pump.
Japanese Patent Laying-Open No. 2005-297061

  However, the conventional molding apparatus has a problem that it is very difficult to synchronize the injection speed for moving the molding material from the storage chamber into the cavity and the control of the air discharge amount by the vacuum pump. In particular, if the type of product to be molded is different, it is necessary to change the speed at which the molding material in the storage chamber is pushed out into the cavity by the extrusion rod, but the amount of air discharged in the cavity is set appropriately according to this speed change. However, there is a problem that the quality of the product is deteriorated due to inappropriate control at present.

  In addition, expensive vacuum pumps, electromagnetic on-off valves, control devices for controlling them are required, the configuration becomes complicated, the number of parts increases, the manufacturing and assembly work is troublesome, and it is difficult to reduce costs. There was a problem.

  The main object of the present invention is to solve the above-mentioned problems in the prior art and easily synchronize the speed at which the molding material is injected from the storage chamber into the cavity and the speed at which the air in the cavity is discharged. An object of the present invention is to provide a molding apparatus that can perform the above process.

  Another object of the present invention is to provide a molding apparatus capable of simplifying the structure and reducing the number of parts, facilitating the manufacturing and assembling operations, and reducing the cost in addition to the above object. .

  In order to solve the above-mentioned problems, the invention according to claim 1 is configured such that the lower mold unit can be lifted and lowered to the bed via the first lifting mechanism, and the upper mold unit can be lifted and lowered by the second lifting mechanism. A through hole communicating with a molding cavity formed by fitting both mold units to the lower mold unit is formed in a vertical direction so that the through hole faces the bed upward. After inserting the extrusion rod attached to the upper surface of the extrusion rod, the storage chamber for the molding material is formed by the through hole and the upper surface of the extrusion rod. In the molding apparatus configured to mold the product by extruding the molding material in the storage chamber into the cavity by the extrusion rod by the step of simultaneously lowering the unit. The downward movement of the knitting is mechanically interlocked to the gist in that a air discharge mechanism for discharging the air in the cavity to the outside.

  According to a second aspect of the present invention, in the first aspect, a plurality of cylinders constituting the first elevating mechanism are vertically fixed on the bed, and the lower mold is attached to an upper end portion of a piston rod of each cylinder. Units are connected, and the piston-side cylinder chamber of each cylinder is configured to be applied with a fluid pressure that applies a clamping force of both mold units, and the air discharge mechanism is formed in the lower mold unit. A first communication path and a second communication path formed in the upper mold unit, wherein one end of the first communication path is opened in the upper surface of the lower mold unit, and the other end is in the rod side cylinder chamber of the cylinder. Communicated by a communication path formed in a flexible pipe or a piston rod, one end of the second communication path is opened to the cavity, and the other end is opened to one end of the first communication path with respect to the lower surface of the upper mold unit. And above It is opened so as to correspond to the upper die unit when die matching the lower mold unit, the first communication passage and second communication passage and summarized in that configured as communicated.

  According to a third aspect of the present invention, in the second aspect, an intake cylinder is erected upward on the bed, and a piston and a piston rod of the cylinder are always urged upward by a spring, and the intake cylinder The rod-side cylinder chamber is connected by the flexible pipe and the branch pipe, and the piston rod of the intake cylinder is configured to be moved downward by the lowering operation of the upper mold unit. .

The gist of the invention of claim 4 is that, in claim 3, the branch pipe is provided with an on-off valve.
According to a fifth aspect of the present invention, in the first aspect of the present invention, the bed is provided with an intake cylinder standing upward, and the piston rod of the cylinder can be moved up and down in conjunction with the lifting operation of the upper mold unit. The gist of the invention is that the upper die unit and the piston rod are connected to a die unit, and a communication passage is formed in the upper die unit and the piston rod to communicate the rod side cylinder chamber of the cylinder with the cavity.

(Function)
In the present invention, after the upper mold unit is aligned with the lower mold unit, the air in the cavity is mechanically discharged to the outside in synchronization with the lowering operation of both mold units. The speed at which the air is injected into the cavity and the speed at which the air is discharged from the cavity can be easily synchronized.

  According to the invention described in any one of claims 1 to 5, it is possible to easily synchronize the speed at which the molding material is injected from the storage chamber into the cavity and the speed at which the air in the cavity is discharged. .

  According to the second aspect of the present invention, since the air discharge mechanism is configured using the cylinder constituting the first elevating mechanism, in addition to the above effects, the structure is simplified and the number of parts is reduced. Attaching work can be easily performed and the cost can be reduced.

Hereinafter, an embodiment of a molding apparatus embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, hydraulic cylinders 12 constituting a first lifting mechanism are erected upward at a plurality of locations on the upper surface of the bed 11. Each hydraulic cylinder 12 includes a housing 13, a piston 14, and a piston rod 15, and a lower mold unit 16 is attached to an upper end portion of each piston rod 15 so as to be capable of reciprocating in the vertical direction. The lower die unit 16 includes a holder 17 connected to the upper end portion of each piston rod 15 and a lower die 18 fitted and fixed in an accommodation recess 17b formed in an upper surface 17a of the holder 17. . A product molding surface 18 b is formed on the upper surface 18 a of the lower mold 18. A cylindrical storage chamber forming body 19 is inserted and fixed in through-holes 17 c and 18 c formed in the vertical direction in the center portion of the holder 17 and the lower mold 18. An extrusion rod 20 is erected and fixed on the upper surface of the central portion of the bed 11, and the upper end portion of the extrusion rod 20 is inserted into the through hole 19 a of the storage chamber forming body 19. A storage chamber 21 for the molten metal Y is formed by the upper surface of the extrusion rod 20 and the through hole 19 a of the storage chamber forming body 19.

  An upper die unit 22 is mounted on the bed 11 so as to be able to reciprocate in the vertical direction via a second elevating mechanism (not shown) such as a hydraulic cylinder. The upper mold unit 22 includes a holder 23 and an upper mold 24 that is bonded and fixed to the lower surface of the holder 23. A product molding surface 24 b is formed on the lower surface 24 a of the upper mold 24.

Next, a hydraulic circuit for operating each hydraulic cylinder 12 will be described.
The oil pumped up from the oil tank 32 by the pump 31 is supplied to the piston-side cylinder chamber 34 of the hydraulic cylinder 12 through the conduit 33. An electromagnetic on-off valve 35 having a neutral port 35 a, a supply port 35 b and a discharge port 35 c is connected to the pipe line 33, and a pressure adjusting valve 36 is connected to the electromagnetic on-off valve 35.

  Next, as shown in FIG. 2, after the upper mold 24 of the upper mold unit 22 is aligned with the lower mold 18 of the lower mold unit 16, the molding surface 18b of the lower mold 18 and the molding surface 24b of the upper mold 24 are aligned. The air discharge mechanism for discharging the air in the cavity K formed by the above will be described.

  As shown in FIG. 1, a first communication passage 41 is formed in the holder 17 of the lower mold unit 16, its one end opening 41 a is formed in the upper surface 17 a of the holder 17, and the other end opening 41 b is on the left side of the holder 17. Formed on the surface. The other end opening 41 b of the first communication passage 41 is connected to the rod side cylinder chamber 42 of the hydraulic cylinder 12 by a flexible pipe 43.

  On the other hand, a second communication path 44 is formed in the holder 23 and the upper mold 24 of the upper mold unit 22, and one end opening 44 a of the communication path 44 is formed in the lower surface 23 a of the holder 23. The two openings 44b are formed in the molding surface 24b of the upper mold 24. The one end opening 44a is formed so as to be positioned on the same straight line as the one end opening 41a of the first communication passage 41 formed in the holder 17 of the lower mold unit 16 in the vertical direction. The first communication path 41 and the second communication path 44 are communicated with each other.

Next, the operation of the molding apparatus configured as described above will be described.
In FIG. 1, the upper mold unit 22 is held at a release position above the lower mold unit 16, the electromagnetic opening / closing valve 35 is held by a neutral port 35 a, and oil is supplied to the piston side cylinder chamber 34 to lower the upper mold unit 22. The mold unit 16 is held at the upper limit position, and the volume of the storage chamber 21 formed inside the storage chamber forming body 19 is maximum. In this state, the molten metal Y is supplied into the storage chamber 21 by a molten Y injection mechanism (not shown).

  Next, when the upper die unit 22 is moved downward by a predetermined distance by a second lifting mechanism (not shown), the lower surface 24a of the upper die 24 is brought into contact with the upper surface 18a of the lower die 18 as shown in FIG. The lower surface 23a of the holder 23 is in contact with the upper surface 17a of the holder 17, the one end opening 44a of the second communication passage 44 is connected to the one end opening 41a of the first communication passage 41, and the first communication passage 41 and the second communication passage 44 are connected. Is communicated. In this state, when the electromagnetic on-off valve 35 is switched from the neutral port 35a to the discharge port 35c and the upper mold unit 22 is moved further downward, the molten metal Y in the storage chamber 21 is relatively moved upward by the push rod 20. The molten metal Y is fed into the cavity K. In this process, the air in the cavity K is moved downward by the piston 14 and the piston rod 15 of the hydraulic cylinder 12, so that the volume in the rod side cylinder chamber 42 is increased, whereby the second communication passage 44, Air in the cavity K is sucked into the rod side cylinder chamber 42 via the first communication passage 41 and the pipe 43.

As shown in FIG. 3, in a state where the lower mold unit 16 and the upper mold unit 22 are moved to the lowest limit position, the molten metal Y in the storage chamber 21 flows into the cavity K, and a desired product is molded.
When the molding operation of one product is completed, in FIG. 3, the upper mold unit 22 is moved upward by a second lifting mechanism (not shown), and the discharge port 35c of the electromagnetic on-off valve 35 is switched to the supply port 35b. Pressure oil is supplied to the piston side cylinder chamber 34 of the hydraulic cylinder 12, the lower mold unit 16 is moved to the upper limit position, and the mold release state shown in FIG.

  The molten metal Y in the cavity K tries to enter the second communicating path 44 from the opening 44b of the second communicating path 44. However, since the opening 44b is formed with a small diameter, the molten metal Y enters. There is nothing.

According to the molding apparatus of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the rod-side cylinder chamber 42 of the hydraulic cylinder 12 that moves the lower mold unit 16 up and down, the cavity K formed by the lower mold 18 and the upper mold 24 are replaced with the holder 17 of the lower mold unit 16. The first communication passage 41, the flexible cylinder 43 connecting the rod side cylinder chamber 42 and the first communication passage 41, and the second communication passage 44 formed in the upper mold unit 22 are configured to be able to communicate with each other. For this reason, the air in the cavity K can be discharged to the outside in synchronization with the lowering operation of the upper mold unit 22, and the quality of the product can be improved. In particular, even when the lowering speed of the upper mold unit 22 is changed according to the type of the product, the air discharge amount can be appropriately controlled in synchronization with the change.

  (2) In the above embodiment, the first communication path 41 is formed in the holder 17, the first communication path 41 and the rod side cylinder chamber 42 are connected by the flexible pipe 43, and the second communication path is connected to the upper mold unit 22. It is possible to obtain a very simple configuration that only forms 44, to reduce the number of parts, to facilitate manufacturing and assembling operations, and to reduce costs.

  (3) In the above embodiment, after the lower mold unit 16 and the upper mold unit 22 shown in FIG. 2 are matched, the electromagnetic on-off valve 35 is switched from the neutral port 35a to the discharge port 35c, and the piston side cylinder chamber 34 is switched by the pressure adjusting valve 36. The amount of oil discharged from the oil tank 32 to the oil tank 32 is limited. For this reason, in the process in which the lower mold unit 16 and the upper mold unit 22 are moved downward, the upper mold unit 22 can be held in an appropriate clamping state with respect to the lower mold unit 16, and the molten metal Y in the cavity K It is possible to prevent leakage from the mold matching surface.

  Next, another embodiment in which the molding apparatus of the present invention is embodied will be described with reference to FIG. In addition to the configuration of the molding apparatus of the above-described embodiment, the molding apparatus of this embodiment has a function of properly discharging the air in the cavity K to the outside when the volume of the cavity K increases. It is provided.

  In this embodiment, as shown in FIG. 4, an intake cylinder 51 is fixed upward on the upper surface of the bed 11. The intake cylinder 51 includes a housing 52, a piston 53, a piston rod 54 connected to the piston 53, and a coil spring 56 that is housed in the piston-side cylinder chamber 55 and biases the piston 53 upward. And is composed of. The piston-side cylinder chamber 55 of the intake cylinder 51 is opened to the atmosphere, the rod-side cylinder chamber 57 is communicated with the flexible pipe 43 and the branch pipe 58, and a switching valve 59 is provided in the branch pipe 58. Yes.

On the other hand, an operating rod 60 is cantilevered on the holder 23 of the upper mold unit 22 so as to correspond to the piston rod 54 of the intake cylinder 51 in the vertical direction.
Next, the operation of the molding apparatus configured as described above will be described.

  FIG. 4 shows a state in which the upper mold unit 22 is moved to the upper mold opening position, and the switching valve 59 is switched to the communication port 59 a that communicates with the branch pipe 58. In this state, when the upper die unit 22 is moved downward by a second lifting mechanism (not shown), the lower surface of the upper die unit 22 is joined to the upper surface of the lower die unit 16, and the tip of the operating rod 60 is synchronized with this. Is brought into contact with the upper end of the piston rod 54. If the upper die unit 22 is further moved downward in this state, the suction action due to the expansion of the volume of the rod side cylinder chamber 42 of the hydraulic cylinder 12 and the expansion of the volume of the rod side cylinder chamber 57 of the intake cylinder 51 will result. The air in the cavity K is efficiently discharged outside by the suction action. Therefore, when the volume of the cavity K is large, air can be discharged properly to improve the quality of the product.

  When the lower mold 18 and the upper mold 24 are replaced with ones having a small cavity K, the switching valve 59 is switched from the communication port 59a to the atmosphere release port 59b, and the rod side cylinder chamber 57 is released to the atmosphere. The operation is switched to the state and the operation of the intake cylinder 51 is invalidated.

Next, another embodiment in which the molding apparatus of the present invention is embodied will be described with reference to FIG.
In this embodiment, the first communication passage 41 and the flexible pipe 43 described in FIG. 1 are omitted, and the intake cylinder 61 is erected upward on the upper surface of the bed 11. The cylinder 61 includes a housing 62, a piston 63, a piston-side cylinder chamber 64 that is always open to the atmosphere, a rod-side cylinder chamber 65, and a piston rod 66 connected to the piston 63. The piston rod 66 is bent in an L shape, and the upper end of the piston rod 66 is connected to the side surface of the holder 23 of the upper mold unit 22. The opening 44a of the second communication path 44 of the upper mold unit 22 and the rod side cylinder chamber 65 of the cylinder 61 are communicated with each other by a first communication path 66a formed at the center of the piston rod 66. .

Next, the operation of the molding apparatus configured as described above will be described.
FIG. 5 shows a state in which the upper die unit 22 is held at the upper release position and the piston 63 and the piston rod 66 are moved upward. In this state, when the upper die unit 22 is lowered by the second lifting mechanism (not shown), the piston 63 is moved downward by the piston rod 66, and the volume of the rod side cylinder chamber 65 is increased. After the lower surface of the upper mold unit 22 is joined to the upper surface of the lower mold unit 16, the air in the cavity K is discharged to the outside due to the increase in the volume of the rod side cylinder chamber 65 due to the downward movement of the piston 63. Therefore, the product is properly formed.

In addition, you may change the said embodiment as follows.
Although not shown, a pump is connected to the second communication path 44 formed in the upper mold unit 22 via a communication pipe so that the pump is mechanically operated in synchronization with the lowering operation of the upper mold unit 22. It may be configured.

  Although not shown, instead of the flexible pipe 43, a communication path that connects the first communication path 41 and the rod side cylinder chamber 42 to the piston rod 15 may be formed.

Sectional drawing of the mold release state which shows one Embodiment which actualized the shaping | molding apparatus of this invention. Sectional drawing of the mold alignment state of a shaping | molding apparatus. Sectional drawing which shows the shaping | molding completion state of a shaping | molding apparatus. Sectional drawing of the mold release state which shows another embodiment of the shaping | molding apparatus of this invention. Sectional drawing of the mold release state which shows another embodiment of the shaping | molding apparatus of this invention.

Explanation of symbols

  K ... cavity, 11 ... bed, 14, 53, 63 ... piston, 15, 54, 66 ... piston rod, 16 ... lower mold unit, 17a ... upper surface, 17c, 18c, 19a ... through hole, 20 ... extrusion rod, 21 ... Reservoir chamber, 22 ... Upper mold unit, 23a ... Lower surface, 34, 55, 64 ... Piston side cylinder chamber, 41, 66a ... First communication passage, 41a, 44a ... One end opening, 42, 57, 65 ... Rod side cylinder Chamber, 43 ... flexible piping, 44 ... second communication passage, 44a, 44b ... opening, 51, 61 ... intake cylinder, 58 ... branch pipe, 61 ... cylinder.

Claims (5)

The lower mold unit is mounted on the bed so that the lower mold unit can be moved up and down via the first lifting mechanism, and the upper mold unit is mounted on the bed so that the lower mold unit can be moved up and down. A through hole communicating with the molding cavity formed in the vertical direction is formed, and an extrusion rod mounted upward on the bed is inserted into the through hole, and the through hole and the extrusion rod are inserted. A molding material storage chamber is formed by the upper surface, the upper mold unit is lowered and aligned with the lower mold unit, and then both mold units are lowered simultaneously, whereby the molding material in the storage chamber is extruded. In a molding apparatus configured to extrude into the cavity by a rod and mold a product,
A molding apparatus comprising an air discharge mechanism for discharging the air in the cavity to the outside mechanically interlocking with the lowering operation of the upper mold unit. 2. The cylinder according to claim 1, wherein a plurality of cylinders constituting the first elevating mechanism are erected upward and fixed to the bed, the lower mold unit is connected to an upper end portion of a piston rod of each cylinder, The piston-side cylinder chamber is configured to be provided with a fluid pressure that applies a clamping force of both mold units, and the air discharge mechanism includes a first communication path formed in the lower mold unit, and an upper mold unit. A second communication passage formed on the upper surface of the lower mold unit, and the other end of the first communication passage is formed in a flexible pipe or a piston rod in the cylinder chamber on the rod side of the cylinder. One end of the second communication path is opened to the cavity, and the other end is opened to correspond to the upper end of the first communication path vertically with respect to the lower surface of the upper mold unit. , When the upper die unit is die matching the lower mold unit, the molding device is the first communication path and the second communication path, characterized by being configured as communicated. 3. The intake cylinder according to claim 2, wherein an intake cylinder is erected upward on the bed, the piston and the piston rod of the cylinder are always urged upward by a spring, and the rod side cylinder chamber of the intake cylinder A molding apparatus connected by a flexible pipe and a branch pipe, wherein a piston rod of the intake cylinder is configured to be moved downward by a lowering operation of the upper mold unit. 4. The molding apparatus according to claim 3, wherein the branch pipe is provided with an on-off valve. 2. The intake cylinder according to claim 1, wherein an intake cylinder is erected upward on the bed, and a piston rod of the cylinder is connected to the upper mold unit so as to be movable up and down in conjunction with a lifting operation of the upper mold unit. A molding apparatus, wherein the unit and the piston rod are formed with a communication passage communicating with the rod side cylinder chamber of the cylinder and the cavity.

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