JPH06304732A - Temp. control method of injection sleeve - Google Patents

Abstract

PURPOSE:To prevent galling of an injection sleeve so as to enable smooth injection action by executing temp. measurement of plural places in the axial direction of an injection sleeve, comparing the measurements to the target temp. value of injection sleeve, and correcting the deviation between measured and target values with raising/lowering temp. through a heating heater and cooler required for plural places. CONSTITUTION:A temp. of an injection sleeve 7, being in series of operations of pouring, injection and filling to an injection sleeve 7, is measured at plural places in the axial direction. In order to make a temp. of the injection sleeve 7 turn to the setting target temp. value, a high temp. place in a lower region of the injection sleeve 7 is cooled by a cooler 15 and a low temp. place in an upper region of the injection sleeve 7 is heated by each heater 17, constantly controlling to have uniform temp. distribution in the axial direction. Therefore, abnormalities such as warpage, bending, etc., due to an expansion difference of high/low temp. of the injection sleeve 7, also not causing failure. By this method, long term continuous and stable operation is surely and easily executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a temperature of an injection sleeve of a die casting machine used for die casting, squeeze casting and the like.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view showing a deformed state of a conventional injection sleeve, and FIG. 4 is a horizontal sectional view taken along the line IV-IV in FIG. Conventionally, in a horizontal die clamping and vertical casting die casting machine, a plunger tip 9 is slidably housed in an injection sleeve 7 having a pouring port 10 at one end, and the other end of the injection sleeve 7 is inserted through a gate. It communicates with the cavity 6 formed between the molds, and the molten metal A in the injection sleeve 7 is filled into the cavity 6 by the entry of the plunger tip 9 and solidified.

[0003]

By the way, in such a conventional injection sleeve 7, there is a problem regarding the shape of the injection sleeve 7. That is, for example, 650
When the molten metal A of aluminum alloy having a temperature of 750 ° C. is poured into the injection sleeve 7, the molten metal A becomes a semi-cylindrical shape inside the injection sleeve 7, and the temperature of the injection sleeve 7 at the portion in contact with the molten metal A rises, It expands compared to the part that does not contact A. In this case, the lower region of the injection sleeve 7 having the molten metal A therein is heated to 300 ° C. or more, and the upper region of the injection sleeve 7 having no molten metal A is heated to about 150 to 250 ° C. This causes a difference in expansion dimension due to this temperature difference, and as shown in an exaggerated manner in FIGS. 3 and 4, the injection sleeve 7 has a downward convex shape in the axial direction and a slim-shaped irregular shape in the radial direction. Become.

Therefore, the molten metal is inserted between the deformed injection sleeve 7 and the plunger tip 9, and galling occurs between the plunger tip 9 and the injection sleeve 7, which hinders a smooth injection operation.

In view of the above-mentioned conventional problems, the present invention is to provide a method for controlling the temperature of an injection sleeve which is capable of performing a smooth injection operation without galling between the plunger tip and the injection sleeve.

[0006]

In order to achieve the above object, the method of controlling the temperature of the injection sleeve according to the present invention is such that the molten metal is cast into the cavity of the mold which is clamped from the horizontal direction. A cooler disposed in the lower region of the horizontal injection sleeve and a plurality of heaters provided on the outer peripheral portion in the axial direction of the injection sleeve are provided to increase or decrease the temperature of the injection sleeve. The temperature of each part was measured, compared with the target temperature value of the injection sleeve, and the deviation between the measured value and the target value was corrected by raising and lowering the temperature with the heaters and coolers corresponding to the above-mentioned plural places.

[0007]

According to the temperature control method of the injection sleeve of the present invention, the temperature of the injection sleeve during a series of operating operations such as pouring, injection, and filling of the injection sleeve is measured at a plurality of points in the axial direction, and the set target temperature is set. The high temperature part of the lower part of the injection sleeve is cooled by a cooler so that the value becomes a value, and the low temperature part of the upper part of the injection sleeve is heated by individual heaters so that a uniform temperature distribution is obtained in the axial direction at all times. To control. Therefore, there will be no abnormalities such as warpage or bending due to the difference in expansion of the injection sleeve at high and low temperatures.
Also, it will not be damaged.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the temperature control method for an injection sleeve according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional view of an injection sleeve showing an embodiment of the present invention, and FIG. 2 is a horizontal sectional view taken along line II-II of FIG. In the figure, 1 is a mold, and a fixed mold 3 attached to a fixed plate 2 provided upright on a machine base 12,
The fixed mold 3 comprises a movable mold 4 attached to a movable plate 5 corresponding to the fixed mold 3, and the fixed plate 2 includes a fixed mold 3
An injection sleeve 7 communicating with the inside of the cavity 6 via a runner 11 is attached, and a plunger tip 9 attached to the tip of an injection plunger rod 8 of an injection cylinder (not shown) is slidable back and forth. It is decorated.

Reference numeral 10 is a pouring port for a molten metal A of a predetermined metal,
It is provided immediately before the plunger tip 9 before the start of injection and is closed by the plunger tip 9 after the start of injection. Reference numeral 13 is a tie rod. In FIG. 2, assuming that the lower half region of the injection sleeve 7 is the lower region X and the upper half region thereof is the upper region Y, the injection sleeve 7
For example, 650 poured from the pouring port 10 into the lower area X of
A molten aluminum alloy A having a temperature of ˜750 ° C. is stored.

Therefore, since the temperature of the portion of the lower region X of the injection sleeve 7 which is in contact with the molten metal A is raised to 400 ° C. or higher, the cooler 15 is axially moved in the lower region X of the injection sleeve 7.
Is buried. The cooler 15 is composed of a plurality of pipes (four sets of reciprocating passages in this embodiment), is connected to a cooling pump (not shown), and has a structure capable of passing cooling water.
Expansion of the lower area X of the injection sleeve 7 due to temperature rise is prevented.

In order to prevent supercooling of the lower region X of the injection sleeve 7 by the cooling water in the cooler 15 and to raise the upper region Y as much as the lower region X, the injection sleeve 7 is heated. A heating device 16 is provided on the outer peripheral portion in the axial direction, which is divided into a plurality of equal compartments (three compartments in the present embodiment) and is divided into two compartments, the upper and lower compartments in the radial direction, so that the inside can be separately energized. The heater 17 has a structure in which it is embedded in an annular shape, and is connected by wiring not shown. Furthermore, the heating device 16 for each section
The heater capacity is changed, for example, the heater capacity is configured to be larger on the pouring port 10 side than the cavity 6 side in the axial direction, and on the upper area Y side than in the lower area X side in the radial direction. .

Further, one or several temperature sensors 18 are embedded in the recesses in the circumference of the injection sleeve 7 so as to be spaced apart from each other in the axial direction (six in total), and are connected to the outside by wiring not shown. .

Next, the operation of the embodiment of the present invention constructed as above will be described. The injection sleeve 7 attached to the die-casting machine performs a series of operations such as, for example, the molten metal, filling the molten metal into the mold cavity 6 by advancing the injection plunger tip 9, feeding, cooling, die opening, and product ejection in one injection operation. Perform the operation of. Therefore,
For example, the injection sleeve 7 that repeatedly pours and discharges the molten metal A having a high temperature of about 700 ° C. does not have a uniform temperature distribution in the radial direction, but forms a temperature distribution in which the upper region Y is low and the lower region X is high,
In addition, the temperature rises and falls in the axial direction of the injection sleeve 7 due to the progress of the injection operation, and changes.

Therefore, due to these temperature distributions, the injection sleeve 7 undergoes a warp deformation having a gentle downward convex in the axial direction and an abnormal deformed wedge shape in the radial direction, resulting in damage. It was causing a biting phenomenon. Therefore, in order to eliminate the non-uniform temperature distribution that causes the above-mentioned causes as much as possible, the temperature sensor during injection operation 1
Measure 6 temperature in the axial direction by 8 (3 in the upper area Y,
If there is a temperature error compared to a target temperature value, for example, 250 ° C., the cooler 15 cools and lowers the temperature in the lower region X while heating the heater 17 when the temperature is excessively low.
In the upper region Y, the temperature is raised by heating, and only in the heater 17, the temperature is raised by heating and controlled so as to be uniform in the axial direction.

In the operation of the die casting machine, the lubricating oil is applied several times a day including the start-up to the inner surface of the injection sleeve 7, and the release agent is spray-applied immediately before pouring of each shot about 500 times a day. However, for this reason, there is a problem at a high temperature of 300 ° C. or higher. On the other hand, it is necessary to prevent the solidified layer from forming as much as possible until the poured molten metal A is filled in the cavity 6, so that it is close to 300 ° C. It is desirable because it keeps the temperature. Therefore, for example, 250 ° C. is set as the target temperature value. In this way, uneven deformation of the injection sleeve 7 is prevented in a series of steps of the injection operation, and the galling phenomenon of the molten metal A due to the abnormal deformation of the injection sleeve 7 can be prevented, and safe and long-term continuous operation can be performed. To be achieved.

[0016]

As is apparent from the above description, the method of controlling the temperature of the injection sleeve according to the present invention is such that the molten metal is cast into the cavity of the mold which is clamped from the horizontal direction. When a cooler disposed in the lower region of the injection sleeve and a plurality of heaters provided in the outer peripheral portion in the axial direction of the injection sleeve are provided to raise and lower the temperature of the injection sleeve, a plurality of locations in the axial direction of the injection sleeve are provided. The temperature of the injection sleeve is measured and compared with the target temperature value of the injection sleeve, and the deviation between the measured value and the target value is corrected by raising and lowering the temperature by the heaters and coolers corresponding to the above multiple locations. Since abnormal deformation and galling of the are prevented, long-term continuous stable operation can be performed reliably and easily, and the maintainability is greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an injection sleeve showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a vertical sectional view showing a deformed state of a conventional injection sleeve.

4 is a cross-sectional view taken along the line IV-IV of FIG.

[Explanation of symbols]

 1 mold 3 fixed mold 4 moving mold 6 cavity 7 injection sleeve 9 plunger tip 10 pouring spout 15 cooler 16 heating device 17 heating heater 18 temperature sensor

Claims (1)

[Claims] 1. A cooler disposed in a lower region of a horizontal injection sleeve for pouring molten metal into a cavity of a mold which is clamped from the horizontal direction, and a plurality of coolers on an outer peripheral portion in the axial direction of the injection sleeve. When raising and lowering the temperature of the injection sleeve by providing a heating heater divided into two parts, the temperature of the injection sleeve is measured at a plurality of positions in the axial direction and compared with the target temperature value of the injection sleeve to compare the measured value with the target value. A method for controlling the temperature of an injection sleeve, wherein the deviation is raised and lowered by a heater and a cooler corresponding to the plurality of locations to correct the deviation.