JPS623707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold making machine of the bolt squeeze draw type using a shortcress bolt.

As shown in Japanese Patent Publication No. 48-34091 filed by the same applicant as the present application, the conventional mold making machine of this type is located at the lower part of the mold making machine, and is located under the cylinder containing the squeeze piston, etc. Since it has a structure in which a frame-aligning cylinder is provided on the end face for aligning the flask and pattern plate and cutting out the mold, the structure is complex, making maintenance and inspection troublesome, and the production cost is high. Since the overall height of the mold making machine is high, there are drawbacks such as the need to lower the height by providing a deep pit at the installation location for convenience of work.

The present invention was completed with the aim of providing a mold making machine free from the above-mentioned drawbacks, and the illustrated embodiments will be described in detail below.

Reference numeral 1 denotes a base of a mold making machine, with columns 2 erected from each of its four corners, and below between the columns 2, a cylinder 3 is installed with the ends of its mounting legs 4 fixed to the columns 2, so that the cylinder 3 is fixed in the vertical direction. Pressure fluid supply and discharge holes 5 and 6 are provided in the lower and middle portions of the cylinder 3, and a cylindrical die-cut piston 7 slides inside with the open side facing upward. A lip-type gasket 9 is attached to the outer periphery of the lower end of the punching piston 7 by a presser plate 8, and a through-hole 11 is provided in the center of the bottom plate 10. A pressure fluid supply/discharge hole 13 is provided in the lower part of the side wall 12 of the die-cutting piston 7, and when the die-cutting piston 7 reaches the raised position, the supply/discharge hole 13 connects with the supply/discharge hole 6 of the cylinder 3. The positions are such that they are in communication. 14 is the piston 7 with the lower part cut out
It is a cylindrical squeeze piston that is slidably inserted into the piston, and a hollow seat 16 is formed in the center of the bottom plate 15, and the hollow part is connected to the through hole 1.
6' and an exhaust hole 18 is provided in the side wall 17, and the upper part, which has a slightly smaller diameter than the lower part of the squeeze piston 14, is connected to the cylinder 3.
A guide bush 2 is fitted onto a cylindrical lid 19 attached to the top surface via a presser member 20.
1. Each of the dust seals 22 is slidable on the inner surface thereof, and an exhaust hole 23 is provided on one side of the lid 19 to communicate with the exhaust hole 18 of the squeeze piston 14. Further, an elevating shaft 25 is slidably inserted into the through hole 11 in the bottom plate 10 of the punching piston 7 via a sealing member 24, and flanges 26 and 27 are formed at both upper and lower ends of the shaft 25 at a predetermined distance. Furthermore, the squeeze piston 14 is provided with a through hole 16' which is slidably inserted into the lower part of a spring receiver 28 which constitutes a lower support part of the spring 43, which will be described later. A catch seat 30 that is loosely fitted into the seat 16 is fixed to the upper end of the shaft portion 29, and the lower end can come into contact with the collar 26 of the lifting shaft 25. Therefore, the spring receiver 28 is provided on the bottom plate 15 so as to be movable up and down in conjunction with the up and down movement of the elevating shaft 25. 31 is the squeeze piston 14
An anvil 31 is slidably fitted above the spring receiver 28 at a distance, and an annular elastic member 32 is fixed to the upper end surface of the anvil 31, and an opening in the upper surface is provided in the center. An annular groove 34 is provided on the inner wall surface of the anvil 31 forming the hole 33, and an annular groove 34 is provided near the annular groove 34. The exhaust hole 3 is arranged so as to communicate with the outside of the anvil 31.
A cylindrical shaft 37 is provided in the hole 33 of the anvil 31 and protrudes downward from the center of the table 36 on which a pattern plate, etc. is placed.
A partition wall 38 is formed inside the cylindrical shaft 37 to divide the hollow part into an upper part and a lower part. Through holes 39 and 40 are provided in the wall, and these through holes 39 and 40 are connected to the anvil 3.
In addition, the table 36 is provided with an air supply hole 41 for pressurized fluid that communicates with the hollow part on the upper side of the partition wall 38 of the cylindrical shaft 37. Table 3 on 33
By inserting the cylindrical shaft 37 of 6, the table 3
6 is held on the anvil 31 so as to be able to rise and fall freely, and
Between the lower part of the partition wall 38 of the cylindrical shaft 37 and the bottom of the anvil 31, there is a reservoir for pressurized fluid that flows from the air supply hole 41 through the hollow part of the cylindrical shaft 37 through the through hole 39, the annular groove 34, and the through hole 40. The structure is such that a chamber 42 is formed. Further, as described above, a coiled spring 43 is interposed between the bottom of the anvil 31 fitted into the squeeze piston 14 and the seat 30 of the spring receiver 28.
3, the elevating shaft 25 lifts its flange 2 due to the action of pressure fluid.
6 is raised to a position where the upper surface of the squeeze piston 14 is brought into contact with the lower surface of the bottom plate 15 of the squeeze piston 14, or the upper surface of the collar 27 is brought into contact with the lower surface of the bottom plate 10 of the punching piston 7 via a contact seat 57, which will be described later. When this happens, the spring receiver 28 which is pushed up via the shaft 29 pushes the anvil 31 towards the squeeze piston 1.
4 and held the table 36 up through the elastic member 32, and when the spring receiver 28 reached the upper position, a pattern plate 45, a casting flask 49, etc., which will be described later, were placed on the table 36. Squeeze piston 1 on the bottom surface of table 36 in
4 to form a gap 44 therebetween, and by exhausting the pressure fluid, the lifting shaft 2
5 descends to a position where the lower surface of the collar 26 contacts the upper surface of the bottom plate 10 of the punching piston 7 as shown in FIG. When the spring receiver 28 is pushed down to the lower position due to release of contact with the spring receiver 28, etc., the anvil 31, table 36, etc. are lowered and the lower surface of the table 36 is moved above the squeeze piston 14 during the lowering. By bringing the table 36 into contact with the end surface, the table 36 is transferred to and held by the squeeze piston 14, and the anvil 31 is further lowered slightly to release the contact state between the lower surface of the table 36 and the elastic member 32 of the anvil 31. The strength is set to keep only the anvil 31 in a floating state with a space below the table 36. 45 is table 36
A pattern plate 46 and a guide pin 47 are attached to appropriate positions on the upper surface of the pattern plate, which is detachably placed on the upper surface of the pattern plate. Casting flask 49 that is transported and stopped at its position
Further, above the roller conveyor 48, a squeeze head 52 placed on a frame 51 and a sand hopper 53 are fitted into a pair of beams 54 attached to a support 2. 56 is a stopper when squeezing the squeeze head 52 fixed to the support 2, and 57 is fixed to the lower surface of the bottom 10 of the punching piston 7. A contact seat 58 made of an elastic material is a lid for shielding the upper opening of the cylindrical shaft 37 of the table 36.

With this structure, an empty casting flask 49 is sent on a roller conveyor 48 and placed on a table 36.
When it stops at a predetermined position above, the frame 51 moves forward on the flanged roller 55 to position the sand hopper 53 directly above the flask 49, and then pressurized fluid is supplied into the cylinder 3 from the supply/discharge hole 5. The lifting shaft 25 is raised by the pressure fluid acting on the collar 27,
At the same time, the spring receiver 28 is pushed up through the shaft portion 29 whose lower end is in contact with the collar 26 of the lifting shaft 25 and reaches the upper position, whereby the anvil 31 moves inside the squeeze piston 14 via the spring 43. The elastic member 32 comes into contact with the lower surface of the table 36 on the way up, and continues to rise together with the table 36, with the lower surface of the table 36 being positioned above the upper end surface of the squeeze piston 14. At the same time, the die-cutting piston 7 also moves up inside the cylinder 3 together with the squeeze piston 14, anvil 31, table 36, etc. due to the pressure fluid, and this upward movement causes the guide pin 47 of the pattern plate 45 to move upward. The flask 4 is fitted into the pin hole 50 of the flask 49 that is waiting.
The sand hopper 53 is positioned and placed on the pattern plate 45, and the sand hopper 53 is temporarily stopped at the shortcut bolt operation position where its lower surface is slightly above the roller conveyor 48.
A certain amount of sand is put into the flask 49 on the table 36, and as shown in FIG. 2, the table holds the pattern plate 45, the flask 49, and the filled sand with the anvil 31 in the upper position 3
6 is floated above the squeeze piston 14, and a gap 44 is maintained between the lower surface of the table 36 and the upper end surface of the squeeze piston 14. Next, when pressure fluid is supplied to the air supply hole 41 of the table 36, the pressure fluid passes through the hollow part of the cylindrical shaft 37, through the through hole 39, the annular groove 34, and the through hole 40.
When the pressure inside the reservoir chamber 42 rises, the table 36 is pushed up against its own weight and the weight of the pattern plate 45, flask 49, etc., and the anvil 31 is pushed up by the spring 4.
3, and this relative movement blocks the communication between the through hole 39 and the annular groove 34, stopping the supply of pressure fluid into the reservoir chamber 42, and shielding it with the cylindrical shaft 37. The exhaust hole 35 of the anvil 31, which had been previously closed, is communicated with the reservoir chamber 42, and the pressure fluid in the reservoir chamber 42 is exhausted to the outside through the exhaust holes 35, 18, and 23. Therefore, the pressure in the reservoir chamber 42 is reduced. The table 36 descends to its original position due to its own weight, and the anvil 31 rises due to the restoring action of the spring 43, causing the lower surface of the table 36 and the anvil 31 to collide via the elastic member 32, causing the casting flask to collapse. A so-called shot crease joint is added to the sand in the sand 49, and as a result, the through hole 39 and the annular groove 34 are communicated again, and the exhaust hole 35 is connected again.
is shielded and pressure fluid is supplied into the reservoir chamber 42,
That is, the reservoir chambers 42 are alternately communicated with the pressure fluid supply holes 41 of the table 36 and the exhaust holes 35 of the anvil 31, and the shortless joint operation is continued. When such a shortcut bolt operation is repeated an appropriate number of times, the supply of pressure fluid to the air supply hole 41 is cut off to stop the operation, and then the pressure fluid is supplied through the supply and discharge holes 6 and 13, which are in communication with each other. Flows into the lower surface of the squeeze piston 14, the squeeze piston 14 rises, and the collar 26 of the elevating shaft 25 and the lower end of the shaft portion 29 of the spring receiver 28 are separated, and the spring receiver 28 is pushed down by the spring 43 to the lower position, whereby the anvil 31 and the table 36 are lowered, and the table 36 is transferred to the squeeze piston 14, held in a stable state, and released from the spring 43. At the same time, the anvil 31 is edged off from the table 36 and held in a floating state by the spring 43 in the squeeze piston 14 below the table 36, and under such a state, the anvil 31, table 36, etc. are raised by the squeeze piston 14. The sand in the flask 49 is then pressed against the squeeze head 52 waiting above and squeezed. Next, after the squeeze is completed, the supply and discharge holes 6, 1
3 to exhaust the pressure fluid on the lower surface of the squeeze piston 14, the squeeze piston 14 slowly descends together with the anvil 31, the table 36, and the molded flask 49, and the lower surface of the flask 49 is transferred to the roller conveyor 48. When it reaches the above-mentioned shot crease bolt operating position, which is slightly above the above, it is stopped, and in this state, the lower end of the shaft portion 29 of the spring receiver 28, which is in the lower position, is brought into contact with the collar 26 of the lifting shaft 25, which is in the raised position. The spring receiver 28 is in contact with
is pushed up to the upper position again, and as a result, the anvil 31 rises again together with the table 36 etc. via the spring 43, and a gap 44 is formed between the lower surface of the table 36 and the upper end surface of the squeeze piston 14. Then, by exhausting the pressure fluid on the lower surface of the punching piston 7 through the supply/discharge hole 5, the pressure acting on the collar 27 of the lifting shaft 25 is released, and the lifting/lowering is performed. The shaft 25 is the spring receiver 2
As a result, the spring receiver 28 is brought to the lower position again, and the table 36 is again transferred to the squeeze piston 14 to be held in a stable state and the spring 43 At the same time, the anvil 31 is held in a floating state by the spring 43 below it, and at the same time, the squeeze piston 1 in this state is
4. The mold-cutting piston 7 also descends with the anvil 31, table 36, flask 49, etc., and on the way, the molded flask 49 receives flanges on both sides of its lower surface onto the flanged rollers of the roller conveyor 48. Therefore, mold cutting is performed automatically and in a stable state between the pattern plate 45 that continues to descend, and then the molded flask 49 is transferred onto the roller conveyor 48. is sent to the next process, and the die cutting piston 7
is returned to the initial position in the cylinder 3 together with the squeeze piston 14, etc., and thereafter the above operation is repeated to continuously form the mold. It is designed to advance in sequence under electrical control.

As is clear from the above description, according to the present invention, the frame alignment cylinder provided on the lower end surface of the cylinder is eliminated and the mechanism is built into the cylinder, which simplifies the structure and facilitates maintenance, inspection, etc. In addition, the overall height of the mold making machine is reduced and there is no need to excavate deep pits, all of the drawbacks of the conventional molding machine being eliminated, and this is an extremely significant contribution to the industry.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cut-away front view, and FIG. 2 is a partially cut-away front view showing the frame together. 3...Cylinder, 7...Mold-cut piston, 10...
Bottom plate, 14... squeeze piston, 15... bottom plate,
25... Lifting shaft, 28... Spring receiver, 31... Anvil, 33... Hole, 35... Exhaust hole, 36... Table, 37... Cylindrical shaft, 41... Air supply hole, 42... Reservoir chamber,
43...Spring, 16'...Through hole, 29...Shaft portion.

Claims (1)

[Claims] 1 A cylindrical die-cutting piston 7 is slidably inserted into a vertical cylinder 3 with the upper side facing upward, and an elevating shaft 25 is inserted into the through hole 11 provided in the center of the bottom plate 10 of the die-cutting piston 7. A cylindrical squeeze piston 14 is slidably inserted into the punching piston 7, and a through hole 16' in the center of the bottom plate 15 of the squeeze piston 14 has a shaft section at the bottom. The anvil 3 is slidably inserted into the shaft portion 29 of the spring receiver 28 having the spring receiver 29 vertically disposed therein, and has a hole 33 opening on the upper surface formed in the squeeze piston 14.
1 is slidably inserted into the hole 3 of the anvil 31.
A cylindrical shaft 37 projecting downward from the center of the table 36 is slidably inserted into the spring 3, and a spring 4 is inserted between the spring receiver 28 and the anvil 31.
3. A mold making machine characterized by interposing the following.