JPS6277172A - Casting apparatus for casting - Google Patents

Abstract

PURPOSE:To reduce the time for charging a casting cast by a die casting machine into a holding furnace and to prevent the temp. drop of the casting body by gripping the excess part of the casting by a gripping device and the casting body by a conveying means respectively after knock-out, parting the excess part and conveying the body to the holding furnace. CONSTITUTION:A gripping part 25 of a sprue part (w) is gripped by a robot 2A and whole the casting W is held parted from the mold, the casting body Wo is gripped by a conveying robot 2. The casting W is then lifted to the outside of a casting device by both robots 2A, 2 and the sprue part (w) is inclined by the robot 2 to break down the thin-walled parting part 26 of the sprue part (w), by which a runner part (w) is parted from the casting body Wo. The casting body Wo is conveyed in a high temp. state immediately thereafter and is charged into the holding furnace.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a casting manufacturing apparatus.

(Prior art) In the past, sand molds were generally used to cast cast products, but in recent years, mold casting methods have been used from the viewpoints of labor saving, energy saving, pollution control, and high quality casting products. is becoming popular.

However, when casting high-strength, high-toughness cast products such as spheroidal graphite cast iron using the die casting method, the generation of chill (cementite) due to the rapid cooling effect of the die becomes a problem.
As countermeasures, it is generally necessary to increase the C1E, control the casting temperature, control the mold temperature, and perform chill decomposition treatment.

Conventionally, the cast product is cooled down to room temperature after demolding, then placed in a heating furnace and heated to 930-950°C to undergo chill decomposition treatment and austenitization treatment, followed by stabilization of austenite at a somewhat lower temperature. After treatment, various heat treatments were performed as necessary.

In this case, since the chill that has been precipitated and stabilized is decomposed, there are problems such as a high processing temperature and a long processing time.

On the other hand, in Japanese Patent Application Laid-Open No. 59-157221,
A manufacturing technology for spheroidal graphite cast iron is described in which after the cast product is demolded, it is subjected to soaking treatment and then isothermal treatment while maintaining the temperature above the transformation point (A), followed by a reostempering treatment.

According to the technology described in the above publication, the heat retained at a temperature above the A1 transformation point of the cast product is effectively used, and the chill (cementite) is decomposed in a short time while it is thermally unstable and the decomposition temperature is low. It becomes possible to process.

Therefore, we focused on the above-mentioned die casting method and the above-mentioned spheroidal graphite cast iron manufacturing technology, and developed a die casting machine that casts with a die, a heating furnace (soaking furnace) that performs chill decomposition and austenitization treatment, and a heat sink that is removed from the heating furnace. This is a mass production plant for castings, which is equipped with a salt furnace that cools high-temperature castings to a predetermined temperature, a constant-temperature furnace that converts them into bainite, and a transport device that transports castings. It is conceivable to construct a mass production plant for castings that can be manufactured at low cost.

By the way, a cast product that has been released from a casting machine always has a surplus runner attached to it, and when this runner is attached to the main body of the cast product and subjected to heat treatment, Not only is this disadvantageous in terms of thermal energy, but also the transport equipment (e.g.
Since the structure of the conveyor (such as a conveyor in the soaking furnace) becomes complicated, the runner is separated from the main body of the casting and removed before the casting is subjected to heat treatment.

Conventionally, the runners were heat-treated after being cooled to room temperature, and the runners were too strong to be easily separated, so the runners were separated using a hammer or the like with a large impact force. Since the cutting device is designed to be folded, there is a problem in that the cutting device becomes large.

(Means for Solving the Problems) A casting manufacturing apparatus according to the present invention includes a mold casting machine that casts molten metal into a mold, breaks the mold after solidification, and produces a cast product; A surplus part gripping device that grips the surplus part of the cast product, and a conveyance means that transports the cast product body other than the surplus part of the cast product in a high temperature state and introduces it into a soaking furnace. After demolding, the surplus part is gripped by a surplus part gripping device and the casting body is gripped by a conveyance means, and the surplus part is separated from the cast body by the surplus part gripping device and the conveyance means. .

(Function) In the casting manufacturing apparatus according to the present invention, as described above, the surplus part of the cast product is gripped by the surplus part gripping device, and the casting body is gripped by the conveying means, and the surplus part gripping device and the conveying means are respectively gripped. Since the surplus part is separated from the main body of the cast product, the surplus part is easily separated by a weak force while the cast product is maintained at a high temperature and the strength of the runner section does not increase.

At this time, the casting body is held by the conveying means, so
Immediately after the excess portion is cut off, the casting body is transported by the conveying means and placed in the soaking furnace, so the time from demolding to feeding into the soaking furnace is extremely short.

(Effects of the Invention) According to the casting device of the present invention, as explained above, while the cast product is kept in a high temperature state, the excess portion can be easily separated from the main body of the cast product with a weak force. In addition, it is possible to reduce the time from mold breaking to charging into the soaking furnace as much as possible, and to suppress the temperature drop of the cast product body as much as possible.

Furthermore, since the conveying means is effectively used to separate the surplus portion, it is only necessary to provide a surplus portion gripping device with a simple configuration.
The processing line for surplus sections can be simplified and speeded up.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a casting manufacturing plant in which cast iron castings, such as spheroidal graphite cast iron materials, are cast by a die casting method and then heat treated, starting from the upstream side: die casting equipment 1;
A sprue gripping robot 2A that grips the sprue portion that is the surplus part;
A transfer robot 2, a soaking furnace 3, a transfer robot 4.2Mi's salt furnace 5, a low temperature furnace 6, a transfer robot 7, and a constant temperature furnace 8 are provided as transport means, and a cast product after mold dismantling is provided. A temperature detector 9 for detecting the temperature of W and a control unit 10 for controlling the speed of the conveyor in the soaking furnace 3 in response to a detection signal from the temperature detector 9 are also provided.

The mold casting apparatus 1 has eight identical mold units 12 arranged radially on a rotary table 11, as shown in FIGS. 1 and 2.
By intermittently rotating 5 degrees in the direction of arrow A,
In the first and second stages 1a-1b, molten metal is poured from the pourer 13 into the molds 11+ and 12b, and in the third and fourth stages
In stages 1c and 1d, the molten metal is solidified, and in the fifth stage 1e, the mold-broken casting W is taken out by the runner gripping robot 2A and the transfer robot 2, and in the sixth stage 1f, the molds 12a and 12b are removed by air blowing. In the seventh stage 1g, a mold release agent is applied to the mold cavity forming surfaces of the molds 12a and 12b, and in the eighth stage 1h, the molds 12a and 12b are clamped. The casting product W is continuously manufactured by the apparatus 1 at predetermined time intervals.

As shown in FIG. 2, the outer split mold 12a of each mold unit 12 is fixed to the rotary table 11 by a holder 12c, and the inner split mold 12b is attached to the tip of the piston rod 13a of the hydraulic cylinder 13. It is fixed to a fixed holder 12d, and is driven forward and backward in the radial direction by the hydraulic cylinder 13 by switching the direction switching valve 14 of the hydraulic pressure supply path, and is moved between the casting position and the outer split mold 12a combined with the outer split mold 12a. The position is switched from the mold release position to the mold release position retracted inward.

Then, in the fifth stage 1e, the inner split mold 1
2b to the mold release position and place the cast product W into the mold 12a.
12b, a pair of upper and lower ejectors 23 are provided on the inner split mold 12b and the holder 12d, and a pair of upper and lower ejectors 23 are provided on the outer split mold 12a and the holder 12c. The ejector 23 includes a hydraulic cylinder 23a mounted horizontally on the outer surface of the corresponding holder 12c, 12d, and an eject pin 23b driven to advance into the molding cavity by the hydraulic cylinder 23a.

During mold break-up, the ejector 23 of the outer split mold 12a is driven in parallel with the break-out operation of the inner split mold 12b, and the cast product W moves together with the inner split mold 12b to the break-out position, and then moves to the inner split mold 12b. Ejector 23 of split mold 12b
is driven, and the cast product W is ejected to a substantially intermediate position between the two molds 12a and 12b.

Rotating shaft portion 11a at the center of the lower side of the rotary table 11
is horizontally rotatably supported by a base 17 via a bearing 16, and two rows of reversing rollers 18 arranged annularly below the rotary table 11 move on each annular rail 19. A pinion 21 is engaged with an annular rack 20 on the lower outer periphery of the rotary table 11, and the pinion 21 is driven by a motor 22, thereby rotating the rotary table 11 intermittently.

The hydraulic cylinders 23a of each ejector 23 are connected to a hydraulic pressure supply source 24 via a switching valve (path shown), and this switching valve, the switching valve 14, and the motor 22 are connected to a predetermined setting by a casting cycle setting device 15. It is controlled to perform a predetermined operation at the timing of .

The sprue gripping Robosol 1-2A is composed of a normal industrial robot having degrees of freedom in 4 to 6 axes, and is a transport robot 2 that grips the sprue W of the casting W during mold disassembly and grips the casting main body Wo. This is for separating the runner W from the casting main body Wo in cooperation with the cast member Wo.

In order to make it easier to grip the sprue part W with the sprue gripping robot 2A, a horizontal rond-shaped grip part 25 is integrally formed with the sprue part W in the vicinity of the upper end of the runner part W (sprue part). W
When the inner split mold 12b moves to the mold disassembly position, the gripping part 25 is gripped by the wrist end of the sprue gripping robot 2A, and in this way the sprue part W is gripped by the sprue gripping robot 2A.
2A, the cast product W is transferred from the inner split mold 12b to both molds 1 by the ejector 23 of the inner split mold 12b.
It is ejected to a substantially intermediate position between 2a and 12b.

It should be noted that forming the gripping part 25 by inserting a separate member into the upper end of the sprue part W is advantageous in terms of mold shattering.

The transfer robot 2 is a mobile industrial robot having degrees of freedom of 4 to 6 axes, and the sprue gripping robot 2
In cooperation with A, the runner W is separated from the casting body WO which is in a high temperature state (approximately 850 to 950°C), and immediately after this separation, the casting body WO is transported in a high temperature state (approximately 850 to 900°C). and then put it into the soaking furnace 3.

That is, in the state where the sprue gripping robot 2A grips the gripping portion 25 of the sprue W and the casting W is released to the position shown in FIG. 2 as described above, the casting body WO is gripped by the transfer robot 2, Next, the cast product W is lifted out of the casting apparatus 1 by both robots 7 and 2A and 2 as shown in FIG. When it is tilted as shown in the imaginary line at 2A, the thin section 26 of the runner W is broken, and the runner W is separated from the casting main body Wo.

Incidentally, the thin-walled section 26 is formed between the casting main body Wo and the runner section W.
As shown in FIG. 4, it is formed at or in the vicinity of the boundary.

However, instead of tilting the runner W by moving the wrist of the sprue gripping robot 2A as described above, the casting body Wo is moved by the transfer robot 2 while the sprue W is held by the sprue gripping robot 2A. It may be divided by

As mentioned above, the sprue gripping robot is used as the sprue gripping device.
When using 2A, it is extremely advantageous to maintain the posture of the casting W during mold milling of the casting W, but the sprue gripping device is a hydraulic clamping device of a simpler structure other than an industrial robot, may be configured.

That is, after the casting W is demolded, the transport robot 2 grips the casting main body Wo and transports it to the sprue gripping device, and then the sprue W is clamped by the clamping mechanism of the sprue gripping device, and in this state, the casting main body By moving Wo with the transfer robot 2, the thin sectioned drawing 26 can be sectioned. Incidentally, the divided runner section W may be dropped into the storage box by its own weight by releasing the clamp.

Further, in the above embodiment, a sprue gripping device that grips the sprue portion is used as the surplus portion gripping device, but a gripping device that grips the runner portion may be used instead.

The soaking furnace 3 is for heat-treating the cast product W before transporting it to perform chill decomposition and austenitization treatment (austenite homogenization and stabilization).
The soaking process can be carried out at a predetermined temperature level within the temperature range of .degree.

The transfer robot 4 is used to grasp the casting W that has arrived at the downstream end of the conveyor of the soaking furnace 3 and to feed it into the salt furnace 5 and the low temperature furnace 6.

The salt furnace 5 is for immersing the cast product W into molten chloride and cooling it to a predetermined temperature, which is 220 to 450°C.
It is used for hardening the cast product W at a predetermined temperature within the temperature range.

The low temperature furnace 6 is used for ferrite annealing, strain relief annealing, etc. after heat treatment other than austempering, that is, chill decomposition and austenite stabilization treatment in the soaking furnace 3. If an oil bath is placed in the pre-process of this low temperature furnace 6, it becomes possible to perform refining continuously.

The transfer robot 7 carries a cast product W processed in the salt furnace 5.
This is for conveying to the constant temperature furnace 8.

The constant temperature furnace 8 is used to continuously perform constant temperature transformation treatment on the cast product W, and by providing this constant temperature furnace 8, the equipment of the salt furnace 5 can be downsized.

This constant temperature furnace 8 can be used in a temperature range of 100 to 700°C so that it can be used as a salt furnace 5.

The temperature detector 9 is composed of an infrared sensor, and this temperature detector 9 detects the temperature of the cast product W that has been mold balanced in the fifth stage 1e of the mold casting apparatus 1, and outputs the detection signal to the control unit 10. Soaking furnace 3
When the temperature of the cast product W introduced into the soaking furnace 3 is below the transformation point A, the feed speed of the conveyor of the soaking furnace 3 is controlled to be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic plan view of a casting manufacturing plant, Fig. 2 is a vertical sectional view of main parts of a mold casting device, and Fig. 3 is a sprue gripping robot and a transfer robot. FIG. 4 is an enlarged side view of the thin-walled section. 1.Mold casting device, 2A.Gate gripping robot,
2. Transfer robot, 3. Soaking furnace, 12. Mold unit, 12a, 12b, mold, W.. Casting product,
Wo...casting product body, W...runner section. Patent applicant Mazda Motor Corporation Figure 2 Figure 4 Figure 3 Figure 98

Claims (1)

[Claims] (1) A mold casting machine that casts molten metal into a mold and disassembles the mold after it solidifies to produce a cast product; a surplus part gripping device that grips the surplus part of the cast product cast by the mold casting machine; A means for transporting the casting body other than the surplus part of the casting product in a high-temperature state and putting it into a soaking furnace; 1. An apparatus for manufacturing a casting, characterized in that the excess portion is gripped by a conveying means, and the surplus portion is separated from the casting body by the surplus portion gripping device and the conveying means.