JPH0412820A - Core-driving method of mold - Google Patents

Abstract

PURPOSE:To enable a core to be driven without the pipe arrangement provided directly at a cylinder by a method in which flow parts are formed inside a mold and the pressure-control for the ports provided on the fitting surface of the rod cover-side of the cylinder for driving cores is carried through said flow paths. CONSTITUTION:Hydraulic cylinders 3a-3n are fitted to a top force 1, and each rod thereof drives the cores 4a-4n incorporated into the top force. For instance, the cylinder 3n is guided to each part 12, 13 wherein the flow paths 7, 8 which communicate with each cylinder chamber are formed on the fitting surface 11 at the side of a rod-cover 10 through a cylinder tube 9. In the state where the rod 14 is connected to the side of the core 4n, said fitting surface 11 is connected to the surface of the top force 1 and is fixed thereto. The flow paths 19, 20 which communicate each port 15, 16 formed on the front surface opposite to the each port 12, 13 with the each port 17, 18 formed on the side-wall of the top force 1 are formed inside. The relation of the other cylinder to the top force 1 is also similarly arranged. In said top force, each port formed on its side wall is connected to a hydraulic control circuit through tubes (a)-(n).

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a core drive system for molds, and more specifically, it is applied to molding molds with built-in cores used in injection molding, etc., to prevent unnecessary piping. The present invention relates to a method that allows a large number of core drive cylinders to be mounted in close proximity without having to do so.

[Prior art] Molds conventionally used for injection molding etc. have cores built into them in various ways, or have many hydraulic cylinders on the surface of the mold to drive the cores. At the same time, eye bolts and other various control equipment are also installed.

Generally, this type of core drive cylinder uses a normal hydraulic cylinder with ports on the side of the cylinder tube, and each port is directly connected to an external hydraulic control circuit. Pressure control is performed from the cylinder rod, thereby driving the core attached directly or indirectly to the cylinder rod.

[Case II to be solved by the invention] Nowadays, the shapes of products manufactured by injection molding have become extremely complex, and a large number of cores are often incorporated into the mold. It is not uncommon for them to have a very close positional relationship. Therefore,
Naturally, the required number of cylinders for driving the core increases, and the cylinders are installed very close to each other.

In this case, if a normal cylinder with a port provided on the side of the cylinder tube is used as described above, the block forming the port will protrude from the cylinder tube, and the piping will be run approximately vertically from the port. Because it is necessary to do this, the following inconveniences and problems may occur.

■It becomes impossible to mount the cylinders in a narrow area or in a recess, which necessitates extra machining of the indirect drive mechanism and mold.

■Even if it is possible to install a cylinder, piping must be done while avoiding a large number of closely spaced cylinders, eye bolts, and various equipment, making the piping route long and complicated. The design process must be performed without considering whether or not piping is possible, which makes the design procedure extremely troublesome.

■When the mold is moved to take out the product after molding is completed, it may come into contact with a pipe or cylinder and be subjected to external force, causing damage to the pipe mouth body or connecting parts, resulting in an oil leakage accident. There is.

Therefore, the present invention was created with the aim of solving the above-mentioned disadvantages by providing a method for driving the core without providing direct piping to the cylinder.

[Means for Solving the Problems] The present invention provides a metal core drive cylinder that is guided to each port on the rod cover side via a flow path communicating with each cylinder chamber or inside the cylinder tube. Attaching it to a desired position of the mold, and forming a flow path inside the mold that communicates each port of the core driving cylinder with each port provided on the mold surface other than the cylinder mounting area, A core drive system for a mold characterized by operating a core drive cylinder by controlling pressure from each port provided on the surface of the mold. The core drive cylinder is attached to the rod cover side through the flow path, and pressure control is performed on the port provided on the surface. Therefore, the core driving cylinder can be mounted by joining the surface to the mold, and there is no need to provide piping to the cylinder.

In addition, for piping, cylinder mounting may be done to a port provided on the mold surface outside the area, or the port may be connected to a flow path inside the mold to avoid a dense area of cylinders. It can be formed on the surface of the mold. Incidentally, it is often the case that a core is incorporated in the mold, or that it is possible to construct vertical and horizontal flow passages within the mold with relative ease while avoiding the core.

As a result, it is possible to install many core drive cylinders close to the mold without having to consider piping routes, or to assemble the cylinders into narrow recesses in the mold, and it is also possible to control hydraulic pressure. Since the piping from the circuit to the mold can be done in a manner that does not interfere with the movement of the mold, accidents such as oil leakage can be prevented.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view of essential parts showing the arrangement of a core-integrated kennel mold and a core drive cylinder used in injection molding. Additionally, a hydraulic control circuit for operating each cylinder is arranged externally.

In the figure, reference numerals 1 and 2 indicate molds, where l indicates an upper mold and 2 indicates a lower mold. A large number of hydraulic cylinders 3a, 3b, .
, ~, 4m, 4n. It should be noted that there is a case where the core and its driving cylinder are also assembled to the lower mold 2, and in this embodiment, a case where the core and its driving cylinder are assembled only to the upper mold 1 is taken as an example.

In addition, since the upper mold 1 needs to be separated from the bonded state with the lower mold 2 every time injection molding is completed, hydraulic cylinders 3a, 3b, ~, 3m, 3 are installed on the upper surface of the upper mold 1.
In addition to the eye bolts 5a and 5b, the robot is moved up and down by a lifting device (not shown) via chains 6a and 6b.

By the way, each hydraulic cylinder 3a, 3b, -3m, 3n has a structure as shown in FIG. That is, the basic configuration is a flange-type double-acting cylinder or a single-lot type double-acting cylinder (double-lot type in the figure). For example, in the case of a hydraulic cylinder 3n, there are flow passages 7 and 8 communicating with each cylinder chamber. is attached to the rod cover 10 side via the inside of the cylinder tube 9 through each port 12 formed on the surface 11.
I am led to 13.

Then, with the rod 14 connected to the core 4n side, the rod cover 10 side is attached by joining the surface 11 to the surface of the upper mold 1 and fixing it with bolts or the like.

On the other hand, the dotted lines in FIG. 1 indicate the flow paths formed inside the upper mold 1, and regarding the relationship between the hydraulic cylinder 3n and the upper mold 1, each port of the hydraulic cylinder 1 and the non-taper 3n is shown in FIG. 1
2. Each port 15 formed at a surface position opposite to 13
．． 16 and each port 17.18 formed in the side wall of the upper mold 1 as shown in FIG.
It is formed inside the upper mold l. This also applies to the relationship between the other hydraulic cylinders and the upper mold 1, and each hydraulic cylinder is attached to a flow path that communicates with a port on the surface or is formed inside the upper mold 1, and each flow path is connected to the upper mold 1. It is led to a port in the side wall of the l.

Incidentally, inside the upper mold l are respective cores 4a and 4b.

The flow path formed inside the upper mold 1 is the core 4a.

4b, ~, 4m, and 4n are constructed avoiding the built-in parts. (This flow path is constructed by forming vertically and horizontally communicating holes using a gun drill or the like when manufacturing the mold, and finally closing the openings other than the required ports with flanges, etc.) The upper mold 1 having the above configuration has each port (each hydraulic cylinder 3a, 3
b, ~, 3m, 3n) or tubes a, b, ~, m, n
It is connected to the hydraulic control circuit 21 by piping.

During injection molding, the upper mold 1 is first moved and fitted into the lower mold 2 that has been installed in advance, and the hydraulic control circuit 21 controls each hydraulic cylinder 3a, 3b, ~, 3m, 3.
The cores 4a, 4b, . . . , 4m, and 4n are set in their predetermined positions by operating the cores 4a, 4b, 4m, and 4n, and the material to be molded, such as thermoplastic resin, is injected between the upper mold 1 and the lower mold 2 through the injection pipe 22. After molding, the hydraulic control circuit 21 or each hydraulic cylinder 3a is
, 3b, ~, 3m, 3n to operate each core 4a, 4.
b, ++, 4m, and 4n are pulled out, and finally the upper mold 1 is removed upward to obtain a molded product.

According to the core drive system of this embodiment, a large number of hydraulic cylinders 3a, 3b are provided on the upper surface of the upper mold 1.

~3m and 3n cylinders will be installed.As is clear from Figure 1, the piping for these cylinders will be installed in the upper mold 1.
There is no need to perform piping on the upper side, and it is sufficient to connect the piping to ports on the side wall where there is sufficient space.As a result, the hydraulic cylinders 3a, 3b, ~, 3m,
This makes it possible to mount the parts in close contact with each other. Furthermore, when assembling the hydraulic cylinder 3b to the four parts of the upper die l, it is not necessary to provide piping directly to the cylinder 3b, so it can be easily assembled to the four narrow parts.

Furthermore, even when the upper mold 1 is moved, the numerous pipes connected to the side wall of the upper mold 1 do not come into contact with each other, preventing oil leakage accidents due to damage to the pipes and ports. I'll come. The lot 23 on the Heutkacher side shown in FIG. 2 is for detecting the stroke position of the lot 14 of the hydraulic cylinder 3n using a limit switch or the like to obtain a control signal, and the switch storage box 24 (see FIG. ) are connected to the signal leet line X or the hydraulic control circuit 21 side, or these signal leets! l! Since x is very thin and flexible compared to the oil supply pipe, the above-mentioned problem does not occur.

[Effects of the Invention] The mold core drive system of the present invention has the above-described configuration, and thus has the following effects.

(1) Since there is no need to connect the piping directly to the core drive cylinder attached to the mold, it is possible to arrange many cylinders closely together, and the cylinders can be assembled into narrow recesses without difficulty. This allows for more complex and diverse injection molding. Further, an indirect drive mechanism for the core is not required, and extra machining of the mold is not required.

(2) Piping connections from the hydraulic control circuit side to the core drive cylinder can be made in an area other than the mold surface where cylinders, eye bolts, etc. are crowded, so there is no need to consider the position of the cylinder etc. as in the past. Eliminates the need for complicated piping. It also has the advantage of facilitating the procedure for designing the arrangement of the core drive cylinders at the mold design stage.

(3) From the same point as (2) above, it is important to connect the piping from the hydraulic control circuit side with enough space to prevent leaks from colliding with the pipes, cylinders, or eye bolts when the mold is moved. This will prevent situations that could result in oil accidents.

(4) In addition, ■ Piping materials can be saved because there is no need for complicated piping; ■ Assembling man-hours can be significantly reduced because piping to the cylinder is no longer necessary; ■ Accidents may have occurred. It has the advantage that maintenance is extremely easy because it is a simple task to replace the cylinder or the piping connected to the mold.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts showing the arrangement of the core-integrated kennel type and the core drive cylinder according to the embodiment, and a schematic diagram of the hydraulic control section, and Fig. 2 is a diagram showing the arrangement of the core-integrated kennel type and the core-driving cylinder, and Fig. 2 is a schematic diagram of the hydraulic control section used in the same embodiment. FIG. 2 is a sectional view of main parts of a hydraulic cylinder and an upper mold. 1...-Upper mold (mold) 2...Lower mold (mold) 3a, 3
b, ~, 3m, 3n--Hydraulic cylinder 4a 4b
, ~, 4m, 4n-core 5a, 5b... eye bolt 7, 8... channel 9... cylinder tube 10.
・Rod cover 11... Mounting is on the surface 12.13...
・Port 14...Lot 15, 16-...Port 1
7.18...Port 19.20...Flow path 21...
・Hydraulic control circuit a, b, ~, m, n... Management patent application agent Patent attorney Toshikazu Nagai Figure 2

Claims (1)

[Scope of Claims] A core driving cylinder, in which a flow path communicating with each cylinder chamber is guided to each port on the mounting surface on the rod cover side via the inside of the cylinder tube, is installed at a desired position on the mold, and A flow path is formed inside the mold to communicate between each port of the core driving cylinder and each port provided on the mold surface other than the cylinder mounting area, and each port provided on the mold surface is formed in advance. A mold core drive system that operates a core drive cylinder by controlling pressure from a port.