WO2003037547A1

WO2003037547A1 - Mold cooling device

Info

Publication number: WO2003037547A1
Application number: PCT/JP2002/011269
Authority: WO
Inventors: Shigeyoshi Komaki
Original assignee: Ahresty Corporation
Priority date: 2001-10-31
Filing date: 2002-10-30
Publication date: 2003-05-08
Also published as: JP2003136188A; TW200300005A; TWI278363B; JP4028711B2

Abstract

A mold cooling device is provided that has no danger of cooling water flowing out into the cooling hole of the mold after completion of air purging and that can severely effect temperature control of the mold. Accordingly, in the invention, the mold cooling device comprises a fluid confluence (4) where a cooling water feed path (2) for feeding cooling water into a cooling hole (A1) formed in the mold (A) meets an air purge path (3) for feeding high pressure air to air-purge the cooling water in the cooling hole, the cooling water and air being alternately fed into the cooling hole to thereby cool the mold through the fluid confluence, wherein the fluid confluence (4) has check valves (4a, 4b) incorporated therein whereby cooling water and air of lower pressure than the cracking pressure are maintained in the cooling water feed path and in the air purge path, respectively, it being arranged that high pressure air is delivered from the air purge path (3) through the fluid confluence with a time lag after the delivery of cooling water from the cooling water feed path (2) through the fluid confluence (4).

Description

Technical field

The present invention relates to a mold cooling device used for die casting, resin molding, and the like, and more specifically, to circulating cooling water in a cooling hole formed in a mold.

The present invention relates to a mold cooling device that cools a mold. Rice field

Background art

As a technique close to the present invention, there is a mold cooling device disclosed in Japanese Patent Application Laid-Open No. H10-080758. This mold cooling device is provided with a cooling water supply path for supplying cooling water into a cooling hole formed in the mold and an air purge for cooling water in the cooling hole in a pumping section for pumping cooling water and air. An air purge path for feeding a high-pressure air is connected to the cooling water supply path and a fluid merging section for joining the air purge path. By doing so, the mold temperature can be controlled severely by preventing the mold from being overcooled due to the cooling water remaining inside the cooling holes of the mold.

However, in the case of the mold cooling device according to the related art, immediately after the cooling water remaining inside the mold cooling hole is purged with air, the cooling water flows from the cooling water supply path to the mold through the fluid junction. It may flow into the cooling holes, and the effect of the air purge is diminished and the mold becomes too cold. This phenomenon occurs because the cooling water in the cooling water supply path is held at a higher pressure than the original holding pressure. That is, the cooling water is supplied from the cooling water Immediately after the recirculation water has been supplied into the cooling holes of the mold, a high-pressure (higher than the cracking pressure of the check valve) air flows from the air purge path through the above-mentioned fluid junction. The cooling water that has been trapped is sealed at a high pressure, and when the air purge is completed, the differential pressure retained at a pressure exceeding the cracking pressure flows out into the cooling hole of the mold. This tendency is remarkable when a rubber hose is used in the cooling water supply path, and it is considered that the rubber hose expands and functions as a kind of accumulator. The present invention has been made in view of such conventional problems, and there is no possibility that cooling water will flow out into the cooling holes of the mold after the completion of the air purge, and the temperature of the mold is more strictly controlled. The purpose of the present invention is to provide a mold cooling device capable of performing the following. In order to achieve the above object, a mold cooling device according to the present invention is configured to supply cooling water into a cooling hole formed in a mold to a pumping section for pumping cooling water and air. The cooling water supply path is connected to an air purge path for supplying high-pressure air for air purging the cooling water in the cooling hole. A mold cooling apparatus configured to cool a mold by alternately supplying cooling water and air into a hole, wherein cooling water and air having a pressure lower than a cracking pressure are respectively supplied to the fluid converging portion. A check valve to maintain the supply path and the air purge path is incorporated, and after the cooling water is discharged from the cooling water supply path through the fluid merging section, there is a time lag and the High-pressure air is discharged through the fluid junction. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic circuit diagram showing an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, specific preferred embodiments of the present invention will be described with reference to the drawings. The mold cooling device according to the present invention basically includes: a pumping section 1 for pumping water and air; and a cooling hole A 1 connected to the pumping section 1 and drilled in the mold A. In order to merge the cooling water supply path 2 for supplying cooling water into the cooling water supply path 2 and the air purge path 3 for sending high-pressure air for purging the cooling water in the cooling hole A 1, and the cooling water supply path 2 and the air purge path 3 And a fluid converging part 4 The pumping section 1 is for alternately pumping the cooling water and the air. The high-pressure water discharge pump 1b connected to the water supply pipe 1a connected to the water supply source to discharge the cooling water, and the high-pressure water Solenoid valve for cooling water 1c incorporated in the discharge side piping of discharge pump 1b, Solenoid valve for air 1e incorporated in air piping 1d connected to the air supply source, and cooling start signal from the machine An operation control circuit that starts the operation and controls the high-pressure water discharge pump 1b and the solenoid valves 1c and le to control the cooling water and air pressure discharge (discharge amount, discharge timing, etc.). It consists of 1 f and so on.

1 g is a filter for cooling water, 1 h is a solenoid valve for driving the pump, and 1 j is an air pressure adjustment for adjusting the discharge pressure of the cylinder type pump (high-pressure water discharge pump 1 b). The regulator is shown.

At this time, a plurality of cooling water supply paths 2 are branched in parallel on the discharge side of the high-pressure water discharge pump 1b, and a cooling water solenoid valve 1c is installed for each cooling water supply path 2. In addition, a plurality of air purge paths 3 are branched in parallel from the air pipe 1 d connected to the air supply source, and an air solenoid valve 1 e is installed for each air purge path 3 to cool these one. One set of cooling systems is composed of a water supply path and one air purge path, and a fluid junction 4 is provided for each cooling system.Each cooling system is controlled by one operation control circuit 1f. It is configured to be able to do. As the high-pressure water discharge pump 1b for discharging and pressure-feeding the cooling water, a commonly used well-known pump can be used, but in this embodiment, a cylinder-type pump operated by high-pressure air is used. .

The operation control circuit If which controls the cooling water and air pumping (discharge amount, discharge timing, etc.) is controlled by a sequence control method using relays and timers, or a computer program control method using microcomputers. It starts with the cooling start signal from the machine and controls the high pressure water discharge pump 1b, the cooling water solenoid valve 1c and the air solenoid valve 1e. In addition, control the pressure feed (discharge amount, discharge timing, etc.) of cooling water and air in each cooling system.

The fluid junction 4 is for joining the cooling water supply path 2 and the air purge path 3 connected to the pumping section 1 so that cooling water and air can be alternately pumped. The cooling water manifold 5 installed at the upper part or the like is arranged close to the cooling water manifold 5, and the check valves 4a and 4b are inserted.

The check valves 4a and 4b used are spring-type check valves, and a fluid (cooling water or air) having a pressure lower than the cracking pressure is maintained in the cooling water supply path 2 and air purge path 3, respectively. To do.

In this way, by incorporating the check valves 4 a and 4 b in the fluid junction 4, the air purge passage 3 and the cooling water manifold 5 in the reject water supply passage 2 are particularly close to each other. The cooling water is held in the cooling water supply path 2 without having to incorporate the air solenoid valve and the cooling water solenoid valve, and the cooling water and the air can be quickly switched and alternately pumped.

The cooling water manifold 5 is a well-known cooling water manifold having one water supply port and a drain port (not shown) and a plurality of outgoing side ports 5a,. Connect the water supply port close to the outlet of the fluid junction 4 and connect it to the outlet, connect the drainage hose 5c to the drainage port, and set the outlet port 5a, ... and the return side port 5b, ... The reciprocating cooling pipe 6 c is connected through the bases 6 a and 6 b to form the mold cooling section 6, and the reciprocating cooling pipe 6 c can be removed in the cooling hole A 1 of the mold A. Insert Installed.

Next, the operation of the mold cooling device will be described.

First, connect the cooling water pipe 1a of the pumping section 1 to the water supply source and connect the air pipe 1d to the air supply source, respectively, and the cooling conditions (cooling temperature, cooling timing, etc.) for cooling the mold A are the same or close. The cooling system is divided for each part, the fluid junction 4 and the cooling water manifold 5 are connected in sequence to the pumping section 1, and the reciprocating cooling pipe 6c of the mold cooling section 6 is connected to the cooling hole A of the mold. Insert and mount in 1 to electrically connect the operation control circuit 1 f of the pumping section 1 to the control circuit of the machine.

When the operation control circuit 1 f of the pumping unit 1 receives the cooling start signal from the machine, the high-pressure water discharge pump 1 b operates to start the discharge of the cooling water, The valve 1c operates to start pumping the cooling water. The cooling water discharged from the high-pressure water discharge pump 1b is sent from the cooling water supply path 2 to the cooling water manifold 5 through the fluid merging section 4 to the cooling water manifold 5, where each outgoing port 5a of the cooling water manifold 5 is connected. From the hose 6a to the reciprocating cooling pipe 6c, the heat enters the cooling hole A1 of the mold A through the outward path, where heat is exchanged. After that, the cooling water goes back and forth From the return path of the cooling pipe 6c, the hose 6b passes through the return port 5b, ... of the cooling water manifold 5, and is discharged from the drain hose 5c of the cooling water manifold 5.

Then, the cooling water solenoid valve 1c is stopped after a preset time has elapsed, and thereafter, the air solenoid valve 1e operates to start the high-pressure air pumping.

At this time, after the cooling water is discharged from the cooling water supply path 2 through the fluid junction 4, after an appropriate time lag, high-pressure air is discharged from the air purge path 3 through the fluid junction 4. This time lag may be set, for example, by delaying the switching of the sequence circuit by a timer or by delaying the switching by detecting the pressure of a pressure sensor or a pressure switch, but the present invention is not limited to such means. Absent.

Then, when the supply of the cooling water from the pumping section 1 is stopped, the cooling water flowing into the cooling hole A1 of the mold A from the cooling water supply path 2 through the fluid confluence section 4 and the high-pressure air to be pumped next, Instead of being maintained in the cooling water supply path 2 by both the cracking pressure of the check valve 4a, the cracking pressure is maintained in the cooling water supply path 2 only by the cracking pressure of the check valve 4a.

With the supply of cooling water stopped and a time lag, the high-pressure air pumped from the pumping section 1 passes through the air purge path 3 through the fluid merging section 4 and, similarly to the cooling water, each outgoing port of the cooling water manifold 5 From 5 a,…, the hose 6 a passes through the reciprocating cooling pipe 6 c, enters the cooling hole A 1 of the mold A, and purges the cooling water remaining in the cooling hole A 1 of the mold A with air. From the return path of the reciprocating cooling pipe 6 c, the hose 6 13 → the defrosted water manifold 5 is returned to the return side port 5 b, to → the cooling water manifold 5 and discharged out of the mold A. .

The start and stop of the cooling water and air pumping described above are controlled by the operation control circuit 1f of the pumping unit 1 for each cooling system. Also, The operation of pumping and stopping the cooling water and air is performed for each manufacturing cycle of the machine. Industrial applicability

According to the mold cooling device of the present invention, when the cooling water and the air are alternately pumped into the cooling holes of the mold and the cooling water is intermittently supplied, the cooling water is cooled after the air purge is completed. There is no danger of flowing into the cooling holes of the mold. Therefore, it is possible to prevent the mold from being excessively cooled by the remaining cooling water, and to control the mold temperature more severely.

Claims

The scope of the claims

1. The cooling water supply path for supplying cooling water into the cooling holes drilled in the mold and the air for purging the cooling water in the cooling holes ① An air purge path for sending high-pressure air through the cooling water supply path and the air purge path.The cooling water supply path and the air purge path are connected to each other. A mold cooling apparatus configured to cool a mold by supplying the cooling water and air having a pressure lower than a cracking pressure and a pressure to the fluid confluence portion. A check valve to be maintained in the path is incorporated, and after the cooling water is discharged from the cooling water supply path through the fluid junction, high-pressure air is passed from the air purge path through the fluid junction with a time lag. M> 10 seconds