JPH0340447Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an automatic molding machine that automatically molds a mold, and prevents free sand and other foreign substances from entering the mold during mold removal. This is an improved version.

(Prior art) Conventionally, in this type of automatic mold forming machine, the sixth
The die-cutting equipment shown in Figures A, B, and C was used. To briefly explain Fig. 6 A, B, and C above, the automatic mold making machine 40 is provided with upper and lower turntables 42, 42a that are linked to an operating shaft 41, and between the turntables 42, 42a. Several columns 43 are installed in the column, and a formwork arm 44 and a formwork arm 44a which can be raised and lowered are horizontally protruded from each column 43, and the upper formwork arm 44 has a pouring hole 58 through the formwork 45. The lower mold 46 is supported via the mold frame 45a to the lower mold arm 44a.
The molding station 4 supports the molding station 7, and the molding station 4
8. Work station 49, 49a for loading the core into the lower mold 47 and the mold frame 45, 45a.
A squeeze station 50 is provided for overlapping the upper and lower molds 46, 47, and the molds 45, 45a are placed above and below this squeeze station 50, and the molds 45, 45a are pressed from below so as to overlap the upper and lower molds 46, 47 vertically. A support plate 51 that supports the lower mold 47 and a press plate 52 that presses the upper mold 46 from above are faced, and these support plate 51 and the press plate 5
2 are operating rods 53, 53 and 53a, 53a of upper and lower operating cylinders (both not shown).
The turntable 42 is supported by the upper and lower limits 55 and 56 of the stroke length and is arranged to be movable up and down between the operating cylinders, and the turntable 42 is connected to each station 4 via the operating cylinder 57.
It is designed so that it can be rotated intermittently between sections 8, 49 and 50 one section at a time.

In the case of the above, when the upper and lower molds reach the squeeze station and are thumped due to the contact of the mold arm, the lower mold is compressed by equal pressure from above and below by the support plate and the pressing plate. After squeezing, when the press plate moves upward from the lower limit, a negative pressure is instantaneously generated between the press plate and the upper mold. Therefore, due to this negative pressure, foreign matter such as free sand or fine dust attached to the bottom of the pressing plate or scattered on the top of the upper mold enters the pouring hole, which may have a negative effect on the cast product.
There was no end to inconveniences that caused casting defects.

(Problem to be solved by this invention) The problem to be solved by this invention is that when the pressing plate changes from the lower limit to the upper limit after squeezing the lower mold and the upper mold, there is a gap between the pressing plate and the upper mold. The aim is to prevent foreign matter from entering the pouring hole by blowing air into the pouring hole.

(Technical means for solving the problem) The technical means taken by the present invention to solve the above problem is that on the intermittently rotating turntable,
A plurality of upper arms and a lower arm are supported via a plurality of supports, a formwork is supported on these upper arms and a lower arm, and the formwork is used for a squeeze station, a molding station, a work station, etc. around the turntable. While the molding station is moved intermittently, an upper mold is molded and mounted in the molding frame of the upper arm at the molding station, and a lower mold is molded and mounted in the molding frame of the lower arm, and the molding station is moved to the work station. In an automatic mold forming machine equipped with an automatic molding mechanism that inserts a core into the lower mold, reaches the squeeze station, and forms the upper mold and the lower mold into a mold by squeezing, the mold The automatic molding machine is provided with a press plate and a support plate that face each other above and below the molding station to form the mold by squeezing, and an air inlet having a separation hole is bored in the press plate, and the air inlet is supplied with air. It is equipped with a foreign matter removal means connected to an air supply pipe leading to an air source.

(Function) After the upper mold and the lower mold are squeezed by the support plate and the pressure plate, the support plate and the pressure plate are made to follow each other until they reach the lower limit of the support plate while facing each other, and both the support plate and the pressure plate reach the lower limit. At the moment when the pressing plate starts rising from the lower limit, air is injected from the air injection hole to expel foreign matter near the injection hole to the outside.

(Example) Hereinafter, an example of this invention will be described in detail based on the drawings.

In this invention, as shown in FIGS. 1 to 4 A and B, the press plate 1 is placed above the squeeze station 3 on the periphery of the turntable 2 of the automatic molding mechanism A.
The stroke length of the press plate 1 is arranged to be able to rise and fall freely via the actuation cylinder 4 and the actuation rods 5, 5, and the stroke length of the press plate 1 is lowered to the lower limit 6 in synchronization with the support plate 7 described later while reaching the lower limit 6. The press plate 1 is provided with an air inlet 8 penetrating through the upper and lower surfaces thereof, and a plurality of separation holes 8a are provided at the end of the air inlet 8. Foreign matter removal means D is connected to an air supply pipe 9 that communicates with an air supply source (not shown).
Configure. The support plate 7 supports the actuating rods 5a, 5 of the actuating cylinder 4a arranged below the pressing plate 1.
a, and is movable up and down between the lower limit 6a of the squeeze station 3 and the upper limit 10 of the squeeze position, and squeezes an upper mold 11 and a lower mold 12, which will be described later, which are sandwiched between the squeeze station 3 and the press plate 1. After forming into the mold B, the pressure plate 1 is configured to descend to the lower limit 6 and 6a in synchronization with the press plate 1 in the squeezed state, and the press plate 1 stops once it reaches the lower limit 6. The configuration is such that air is injected from the air inlet hole 8 at the same time as the air starts to rise quickly. An upper arm 13 and a lower arm 14 that support the upper mold 11 and the lower mold 12 are connected to an upper movable plate 16 and a lower movable plate that move up and down on a plurality of columns 15 installed between the turntable 2 and the turntable 2a. The same number as 17 (4 in the example)
are supported at equal intervals, and these upper arms 1
3 and the lower arm 14 support a formwork 18. The molding station 19 performs a molding process when the mold 18 emptied by the squeeze process is simultaneously carried into the squeeze station 3 via the upper arm 13 and the lower arm 14. The movable sand pouring port 21 of the sand feeding mechanism 20 disposed above and below the sand feeding mechanism 19 is provided at the top, and the movable sand pouring port 21a is provided at the bottom. When the sand pouring port 21a and the fixed sand pouring port 22a match, the sand is carried into the molding station 19 and the waiting molds 18 are filled with casting sand to form the upper mold 11 and the lower mold 12. Configure. During the above molding process, the preceding one is
Work stations 23, 23 for inserting the core 28
At step a, the core 28 is inserted into the predetermined position of the lower mold 12, and at the same time, at the squeeze station 3, the upper mold 11 and the lower mold 1 are inserted.
2 into mold B and mold B
The mold release process and the transfer process to the conveyor 24 for conveying to the pouring process are performed. The upper mold 11 and the lower mold 12 are formed into a mold B by a squeeze process, and this mold B is transferred onto the conveyor 24 via the push plate 25 of the operating cylinder 4b after the lower limit 6a of the support plate 7 has stopped. They are connected so that they can be used together. In addition, if the separation hole 8a is not provided in the air injection hole 8, the injection hole 26 is filled with gas by supplying air at the same time as the pressure plate 1 starts moving to the lower limit 6, so that the pressure plate 1 is At the moment when it rises from the lower limit 6, the gas that has been pressurized into the pouring hole 26 flows back to the outside together with the continuous air from the pouring hole 8, so that all foreign matter around the pouring hole 26 is removed.

Now, to explain the molding work, first of all,
When the upper arm 13 and the lower arm 14 reach the squeeze station 3 shown in FIGS.
act simultaneously, causing the press plate 1 and support plate 7, which support each other, to reach the upper limit 10 and lower limit 10a of their respective squeeze positions, and in response to the stop signal, the operating cylinders 4, 4a temporarily stop, and then gradually move to the upper limit 10. Then, squeezing is performed by operating the squeeze interval C which exceeds the lower limit 10a, thereby forming a mold B in which the upper mold 11 and the lower mold 12 are integrated. (See FIG. 2A) In response to the signal indicating the end of the squeeze operation, the upper movable plate 16 and the lower movable plate 17 operate simultaneously and rise slightly as shown in FIG. 5A to perform die cutting. In response to the signal indicating the completion of the die-cutting process, the actuating cylinders 4 and 4a, which are on standby in the squeeze process completion state (FIG. 2A), simultaneously shift to the downward stroke, and the press plate 1 and the support plate 7 move synchronously. , and stop when reaching their respective lower limits 6, 6a, and in response to this stop signal, only the actuating cylinder 4 is started to move the press plate 1 from the lower limit 6 to the upward stroke. (5th
(See Figure B)) When the press plate 1 leaves the lower limit 6, compressed air is blown out from the air injection hole 8 communicating with the air supply pipe 9, so that there is a close contact between the upper surface of the mold B and the lower surface of the press plate 1. The occurrence of a negative pressure phenomenon due to a momentary departure from the state is canceled by the injected air pressure. In this case, the compressed air is injected from the lower end of the air injection hole 8 through the separation air holes 8a, which are subdivided into octopus-like shapes, so as to be dispersed in all directions. To surely remove foreign matter from the surface of a mold B without allowing any foreign matter to enter, let alone compressed air. Thereafter, as the press plate 1 rises, the air supply is stopped and restored. After a short waiting time after the press plate 1 rises, the actuating cylinder 4b is started and the press plate 25 transfers the mold B to the conveyor 24. Replace it as shown by the chain line B ₁ above and restore it after completing the work.
(See Figure 5B) During this time, when there is a stop signal due to the previous restoration of the pressing plate 1, the operating cylinder 4 in Figure 3
c operates and rotates the turntable 2 intermittently by 1/4, thereby moving the upper arm 13 and lower arm 14 waiting at the squeeze station 3 to the molding station 19, and moving the upper arm 13 and lower arm 14 waiting at the molding station 19 to the molding station 19, and the lower arm 13, 14 to the work station 23, and the same to the work station 23.
3a, respectively, and repeat the above-mentioned steps and operations to perform the molding process continuously and automatically.

(Effects) Since this invention has the above configuration, it has the following advantages.

(1) The press plate, which squeezes the upper mold and the lower mold by synchronous operation with the support plate, is provided with an air injection hole and communicated with an air supply source, and after the squeeze process is completed, the mold is moved to the lower limit of the molding end. Immediately after delivery, when the press plate starts to rise from the lower limit, gas is poured out from the air injection hole, so that there is a gap between the bottom surface of the press plate and the top surface of the mold due to the rapid rise of the press plate. The phenomenon of negative pressure that occurs is eliminated by air pressure, which in turn prevents the scattering of free sand and floating of foreign objects caused by the negative pressure, and it is possible to reliably prevent these foreign objects from entering the pouring hole.

(2) Compared to conventional methods, the foreign matter removal means includes an air injection hole with a separate air hole on the opposite side of the press and a simple mechanism in which an air supply pipe is connected to the air injection hole, which prevents foreign objects from entering the pouring hole of the mold. This has the effect of greatly reducing the proportion of defective products due to foreign matter intrusion during the casting process.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan perspective view with a part omitted of the squeeze mechanism according to the present invention, FIG. FIG. 3 is a partially-omitted front view of the automatic molding machine; FIG. 4A is a partially-omitted schematic enlarged plan view of the upper movable plate; B is a schematic enlarged plan view of the lower movable platen, FIG. FIGS. 6A to 6C are explanatory diagrams illustrating the procedure for reloading onto a conveyor, and are explanatory diagrams of the prior art. Explanation of symbols of main parts, 1...pressing plate, 2...
Turntable, 3... squeeze station,
6, 6a...lower limit, 7...support plate, 8...air inlet, 8a...separation hole, 9...air supply pipe, 11...
Upper mold, 12... Lower mold, 13... Upper arm, 14... Lower arm, 15... Support column, 18...
... Formwork, 19 ... Molding station, 23, 23
a...Work station, A...Automatic molding mechanism,
B...mold, D...means for removing foreign matter.

Claims (1)

[Claims for Utility Model Registration] A plurality of upper arms 13 and a lower arm 14 are supported via a plurality of supports 15 on a turntable 2 that rotates intermittently, and a formwork 18 is attached to these upper arms 13 and lower arms 14. The upper arm 13 is supported at the molding station 19 while the mold 18 is sequentially and intermittently moved between the squeeze station 3, the molding station 19, the work stations 23, 23a, etc. around the turntable 2. The upper mold 11 is placed in the formwork 18 of
A lower mold 12 is provided in the mold frame 18 of the lower arm 14.
A core is inserted into the lower mold 12 at the work stations 23 and 23a, and the squeeze station 3 is reached and the upper mold 11 and the lower mold 12 are squeezed to form the mold B. Automatic molding mechanism A configured to form
In the automatic mold molding machine equipped with the molding station 19, the mold automatic molding machine
A press plate 1 and a support plate 7 are provided to face each other vertically to form the mold B by squeezing, and an air inlet 8 having a separation hole 8a is bored in the press plate 1, and the air inlet 8 is supplied with air. It is equipped with a foreign matter removal means D connected to an air supply pipe 9 leading to an air source, and the mold B is synchronously transferred to the lower limit 6, 6a while being sandwiched between the press plate 1 and the support plate 7, and immediately after the stop, the mold B is pressed. An automatic mold forming machine equipped with a foreign matter removing means characterized in that gas is discharged from an air injection hole 8 in synchronization with the rise of a plate 1.