JPH0966354A - Method for cooling crude cast material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize cooling speed over the whole body of a crude cast material by measuring temps. at plural positions on the surface of the crude cast material, ejecting cooling water at a position of a slow cooling speed and controlling the cooling water rate according to the temp. SOLUTION: The crude cast material 1 is surrounded with a wall 4 and a space between the crude cast material 1 and the wall 4 is divided into plural parts with the partition walls 5. The surface temps. of the crude cast material 1 are measured with plural thermometers 2. At least one of cooling water ejection nozzle 6 is arranged in each of plural positions of the crude cast material 1. The measured result of the thermometer 2 is transmitted to a control unit. The control unit executes the arithmetic operation, and the cooling water 10 is ejected to a position having a small cooling rate from the nozzle 6 and also, the cooling water quantity is adjusted according to the temp. The concentration of stress and strain in the crude cast material 1 can be reduced, and it is prevented that the crude cast material 1 is cracked and deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling method for cooling a cast raw material which is in a high temperature state immediately after casting, substantially uniformly over the entire raw material, and for example, a cast raw material having a cast member is excessive. The present invention relates to a cooling method capable of cooling without causing stress and strain concentration.

[0002]

2. Description of the Related Art Conventionally, cooling of a casting rough material in a high temperature state immediately after casting is carried out by submerging the entire casting rough material in cooling water in a cooling water tank (for example, Japanese Patent Publication No. 1).
-31981 gazette). In this case, the cooling water tank does not have means for controlling the cooling rate of each part of the casting rough material.

[0003]

However, a cast raw material having a large change in thickness or a cast raw material in which a dissimilar metal member is cast (for example, a base material in which a cast iron liner is cast is made of aluminum is used). In alloy cylinder blocks, etc.), the cooling rate varies depending on the location of the casting rough material, and stress concentration or strain concentration may occur. In the worst case, cracking or deformation occurs and yield decreases. As a means for reducing this, it is conceivable to uniformly cool the entire casting rough material.
An object of the present invention is to provide a cooling method for a casting rough material, which can cool the entire casting rough material substantially uniformly.

[0004]

The present invention which achieves the above object is as follows. (1) A method for cooling a casting rough material, which comprises cooling a casting rough material in a high temperature state immediately after casting by spraying cooling water to a plurality of locations on the casting rough material, and A method for cooling a casting rough material, which comprises detecting and spraying cooling water to a place where the cooling rate is slow and increasing or decreasing the amount of cooling water according to the temperature of the place. (2) A method for cooling a casting raw material in which the casting raw material in a high temperature state immediately after casting is cooled by spraying cooling water to a plurality of locations of the casting raw material with a heater to heat the casting raw material at appropriate portions. To detect the temperature at multiple points on the surface of the rough casting material,
A method for cooling a casting rough material, which comprises spraying cooling water to a place where the cooling rate is slow and keeping the temperature of the place where the cooling rate is too fast with a heater.

In the above method (1), the cooling water is sprayed to a portion having a slow cooling rate to accelerate the cooling, and the cooling water is not sprayed to the portion having a fast cooling speed to accelerate the cooling.
The cooling rate is uniform over the entire casting rough material. In the above method (2), the cooling water is sprayed to the place where the cooling rate is slow to accelerate the cooling, and the place where the cooling rate is too fast is kept warm by the heater so that the cooling rate is slower than the cooling rate. Becomes uniform over the entire casting rough material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention, and FIGS. 6 and 7 show a second embodiment of the present invention. Members common to both embodiments are given the same reference numerals in both embodiments. Further, the figure shows an example of a cylinder block 1 of an automobile engine in which a cast iron liner 1a is cast around an aluminum alloy base material 1b as a casting rough material. However, the casting rough material is not limited to the cylinder block 1, and is not limited to the cast-in-place rough material.

First, portions common to the first and second embodiments of the present invention will be described with reference to FIGS. 1 to 5, for example. The apparatus for carrying out the method for cooling a casting raw material comprises a base 3 on which the casting raw material 1 is placed, and a wall 4 surrounding the casting raw material 1 from the surroundings.
And a partition wall 5 that divides the space between the casting rough material 1 and the wall 4 into a plurality of portions when the casting rough material 1 is cooled at a plurality of locations, and a casting rough material provided at each of a plurality of locations of the casting rough material 1. A temperature detector 2 for detecting and outputting the surface temperature of the material 1, a cooling water spraying nozzle 6 (hereinafter referred to as a nozzle) provided at least one at each of a plurality of casting rough materials, and each nozzle 6 To the cooling water supply source 8, and a control valve 7 provided in the middle of the cooling water passage (pipe or hose) connecting the cooling water supply source 8 and each nozzle 6 to change the amount of cooling water flowing out from each nozzle 6. A controller 9 (for example, a computer) electrically connected to the temperature detector 2 and the control valve 7,
Consists of

The cooling method of the casting rough material carried out by using the above apparatus is a cooling method in which the casting rough material 1 immediately after casting, which is in a high temperature state, is cooled by spraying cooling water to a plurality of places of the casting rough material 1. The temperature detector 2 detects temperatures at a plurality of points on the surface of the rough casting material 1, sends the output to the controller 9, and the controller 9 calculates and outputs cooling water 10 Spraying (water may be applied with momentum, or it may be allowed to flow down without force, including both cases)
At the same time, the amount of cooling water is increased or decreased depending on the temperature of the location. Fast-cooling rate, the determination of the slow, for example, and the temperature T _i of each occurrence can be carried out in comparison with the average temperature T _a at a plurality of locations all, in the case of T _i> T _a slow cooling rate , in the case of T _i <T _a the cooling speed is fast. Then, this cooling control is performed at constant time intervals, and the highest temperature T _im of the temperatures T _{i at} a plurality of locations is obtained.
_ax is the target temperature T ₀ (higher than room temperature but close to room temperature)
Repeat until the following:

Next, a part of the method of the present invention that is peculiar to each embodiment will be described. In the first embodiment of the present invention, FIG.
As shown in FIG. 5, the casting rough material in a high temperature state is placed on the table 3 (FIGS. 1 and 2), and the wall 4 is closed (FIGS. 3 and 4).
Cooling is performed by spraying cooling water (water at or near room temperature) 10 from the nozzle 6. The cooling control by the controller 9 is executed as shown in FIG. First, in step 101, the temperature T _i of each part from the temperature detector 2 is read. Then, the average temperature T _a of the temperatures at a plurality of points is calculated. T _a = (T ₁ + ... + T _n ) / n. Next, at step 103, the plural location number i is set to 1. By repeating steps 104 to 110 until i becomes n due to the increase of i in step 111, the control for the total number of a plurality of places is executed.

The process proceeds from step 103 to step 104, and in step 104, the current temperature T _i of the target location is compared with the average temperature T _a to determine whether the cooling rate of the target location is fast or slow. In step 104, if T _i > T _a , the cooling rate is slow, so the flow proceeds to step 105 to execute cooling with cooling water, and in step 104 T _i ≤
In the case of T _a , it means that the cooling rate is appropriate or high, so the routine proceeds to step 109, where the cooling of the location i by the cooling water is stopped and the cooling is left as it is.

When the process proceeds to step 105 and cooling by the cooling water is executed, the process proceeds to step 106 in order to change the amount of the cooling water according to the temperature level, calculates T _i −T _a, and sets this as the predetermined value A. Compare with. For T _i -T _a> A, higher than A than the temperature of point i is the average value T _a, because it is where you want accelerate the cooling rate, by increasing the amount of cooling water point i (of the control valve 7 Increase the opening) and increase the cooling rate. However, T _i -T _a in step 106. If less A, the temperature of the point i is not so high compared to the average value T _a, reduces the amount of cooling water locations i, to slow the cooling rate.
Steps 107, 108, and 109 proceed to step 110, proceed to step 111 until i becomes n, and set 1 to i.
Is added and the process returns to step 104. When i becomes equal to n in step 110, the process proceeds to step 112. Step 1
At 12, it is determined whether or not T _imax is equal to or less than a predetermined value T ₀ , and if not, a predetermined time (for example, 30
(Seconds), the process returns to step 101, and the above control is repeated until T _imax becomes T ₀ or less.

In the second embodiment of the present invention, in addition to the cooling control of the cooling water of the first embodiment of the present invention, a portion where the cooling rate is too fast is kept warm by a heater to locally slow the cooling rate. In this way, it is possible to more accurately perform uniform cooling of the entire casting rough material. FIG. 6 shows a part different from the first embodiment of the second embodiment of the present invention.
In the cooling control of the second embodiment of the present invention, the step numbers are shown by numbers 200 and above, which are different from those of the first embodiment. Hereinafter, the points different from the first embodiment will be described (the same portions as the first embodiment shall be applied mutatis mutandis to the first embodiment).

In FIG. 6, at a portion of the casting rough material 1 where the cooling rate is too fast (for example, the liner 1a), a heater 12 is provided on a member 11 (for example, an expander piece) in contact with the portion. At 12, the cooling rate is slowed down (heat retention). In addition, since the portion where the cooling rate is too fast (for example, the liner 1a) shrinks quickly and is apt to cause stress and strain concentration,
A mechanism 13 (for example, an expansion mechanism or an expander) that mechanically suppresses the contraction is provided. The expander 13 includes a piece 11 that is divided into a plurality of pieces in the circumferential direction, a taper pin 14 that is inserted on the inner peripheral side of the piece, and a taper pin 14.
And a mechanism 15 (for example, a hydraulic cylinder) that moves the shaft in the axial direction. Although not shown in FIG. 6, a cooling device using the same cooling water as that shown in the first embodiment is provided.

In the second embodiment of the present invention, cooling control is executed as shown in FIG. In FIG. 7, the number is 10
The steps in the 0s are the same as those described in FIG.
In step 104, the temperature T _i of the target location _i and the average temperature T _i
a is compared, and if T _i is less than or equal to T _a , the routine proceeds to step 109, where cooling by the cooling water is stopped. Then, the process proceeds from step 109 to step 201, and it is determined whether T _a −T _i > B. If T _a −T _i > B, the temperature of the point i is lower than the average value T _a by B or more, so it is determined that the cooling rate is too fast, and the process proceeds to step 202. If T _a −T _i > B, the process proceeds to step 110 as it is. . If the cooling speed at the point i is too fast and the process proceeds to step 202, the heater 1
2 is turned on, the portion i is heated to reduce the cooling rate, and the portion i is kept warm. Next, in step 203, the expansion mechanism 13 (expander) is expanded (cylinder 1
5 is operated to lower the pin 14 and open the piece 11.) This also suppresses the contraction of the portion that cools too early (for example, the liner 1a), and reduces stress and strain concentration.
When the process returns to step 101 with a delay in step 113, the heater 12 at the location i is turned off and the expansion of the expansion mechanism 13 is also turned off and reset in step 204.

[0015]

According to the method of the present invention, since the cooling water is sprayed to the place where the cooling rate is slow, it is possible to accelerate the cooling of the place where the cooling rate is slow, and the cooling rate is set to the entire casting rough material. Can be made uniform. as a result,
It is possible to reduce stress and strain concentration of the rough casting material. According to the method of claim 2, the cooling water is sprayed to the portion having the slow cooling rate, and the heater is turned on to slow the cooling at the portion having the excessively fast cooling rate. It can be made uniform. As a result, stress and strain concentration of the rough casting material can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an apparatus for carrying out a method for cooling a casting rough material according to a first embodiment of the present invention.

2 is a plan view of the device of FIG. 1. FIG.

FIG. 3 is a view of cooling the apparatus of FIG. 1 with cooling water,
It is a schematic sectional drawing.

FIG. 4 is a plan view of the device of FIG.

FIG. 5 is a flow chart of control of a method for cooling a casting rough material according to the first embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of an apparatus for carrying out the method for cooling a casting rough material according to the second embodiment of the present invention.

FIG. 7 is a flowchart of control of a method for cooling a casting rough material according to the second embodiment of the present invention.

[Explanation of symbols]

 1 Cast rough material 2 Temperature detector 3 units 4 Wall 5 Partition wall 6 Nozzle 7 Control valve 8 Cooling water supply source 9 Control device 12 Heater 13 Expansion mechanism

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaaki Sugiyama 4-52, Motochicho, Toyota-shi, Aichi Ryoei Engineering Co., Ltd.

Claims (2)

[Claims] 1. A casting rough material in a high temperature state immediately after casting,
A method for cooling a casting rough material by cooling it by spraying cooling water to multiple points on the casting rough material, detecting the temperature at multiple points on the surface of the casting rough material and spraying cooling water to the location where the cooling rate is slow. A method for cooling a cast raw material, which comprises the steps of increasing or decreasing the amount of cooling water according to the temperature of the location. 2. A casting rough material in a high temperature state immediately after casting,
A method for cooling a casting rough material by spraying cooling water to multiple points on the casting rough material to cool the casting rough material with a heater, and detecting the temperature at multiple points on the surface of the casting rough material, A method for cooling a casting rough material, which comprises spraying cooling water to a place where the cooling rate is slow and keeping the temperature of the place where the cooling rate is too fast with a heater.