JPH0622922B2 - Mold replacement method for in-mold foam molding machine - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention enables die-changing work (hereinafter abbreviated as "molding machine") in an in-mold foam molding machine (hereinafter abbreviated as molding machine) to save labor and improve efficiency. The present invention relates to a new mold exchange method.

“Prior Art and Problems” In-mold foam molding (hereinafter, abbreviated as molding) has been conventionally performed using pre-expanded particles (hereinafter, abbreviated as abbreviated particles) such as polystyrene and polyolefin. In the above-mentioned molding method, it is a general method that pre-formed particles are filled in a mold, heated and fused, cooled, and taken out from the mold to obtain a molded product. There are many types of molded products molded by this method, and a mold is used for each type of molded product. Usually, about 5 to 10 molds are prepared for one molding machine. Further, in general, mold exchange is performed every 2 to 6 days for one molding machine. In a large-scale molding plant, there are 10 molding machines.
In the case where a table is installed, there are not a few cases where the intercourse takes place 2-3 times a day. Since the mold exchange is performed while the molding machine is stopped, the mold exchange time varies widely depending on the size of the mold, the type and the working environment, and has a wide range of 0.5 to 8 hours, and even 2 to an average.
Although there is a large variation of 6 hours, the molding production is interrupted during this period and the production efficiency is greatly affected. Also, the number of personnel engaged in sexual intercourse will be 2-3 on average, depending on the scale and work environment. As described above, die-casting is a production factor that greatly affects molding productivity and cost.

On the other hand, although methods have been proposed for streamlining sexual intercourse, few are making innovative progress. As one of the causes of this, it is thought that there is a problem in the system approach that includes not only the mold but also the molding machine. That is, the molding machine is designed and manufactured by focusing on the molding operability in order to improve the productivity, but the fact is that there is little consideration for streamlining the molding process.

The conventional molding machine, the structure of the mold and the die interaction will be described with reference to FIGS. 1 and 2.

Conventional general mold is usually a dedicated frame type mold (hereinafter,
The structure is shown in FIG. 1. The fixed-side and moving-side frames and the medium sized ones are usually fixed and dedicated instead of being combined with other frames or the medium sized ones and exchanged. The outline of the mold exchange method for normal molds is as follows.

(1) Open the mold.

(2) The fixed-side medium plate (1) is set on the fixed-side frame (8), and the fixed-side die plate (3
Bolt to 0).

(3) The eject pin (26) (hereinafter, abbreviated as a pin) is inserted from the front side of the fixed-side middle mold (1), and the feeder (25) is inserted from the fixed-side back plate (10), and the position is adjusted after being set in and out.

(4) Insert the middle mold, in which the middle mold (2) on the moving side is set on the moving side frame (9), into the middle mold (1) on the stationary side and close the mold. When the mold closing is completed, it is fixed to the moving die plate (31) with bolts.

(5) Steam line (14) (15), water line (16)
(17) Connect and attach the drain lines (19) and (20).

(6) Connect and attach the raw material hose and the air tube of the feeder (25).

In the above description of the mold interchanging method, there are two reasons why the pin and the feeder are not set before the fixed side frame is fixed to the die plate. That is, since the length of the fixed-side die with the pins attached is often larger than the die opening distance, the fixed-side die cannot be inserted between the die plates when the pins are attached. When inserting the pin with the fixed mold attached, move the die plate (3
1) has a grid-like space, and can be easily inserted and attached. Also, the reason why you do not install the feeder at the same time is
The center of gravity of the mold moves backward due to the weight of the feeder, which makes it difficult to attach to the fixed-side die plate because the posture during lifting is not vertical and tilts with the normal method. The mold is swaying when it is hoisted with rope, and it is difficult to hold it down by hand, especially when the mold is large, and there is a risk that the ends of the pins and feeder may come into contact with the frame of the molding machine and cause damage. Because of the large number, pattern workers tend to avoid this method. Therefore, the conventional method has a series of operations as described above, and the removal of the mold is started from the reverse of the above method. In either case, it takes manpower and time. Is a problem.

With the recently advanced molding machines and molds, the fixed side and moving side frames are fixed to the molding machine, and water, steam, and drain pipes are also installed and fixed in advance, and the fixed side and moving side medium sized molds are fed and pinned. A method using a master frame-type mold that engages in molds with the attached is also developed and partly implemented. In this master frame method, as shown in FIG. 3, the mold interchanging method is as shown in FIG. 3, in which the fixed side eyebolts (38) and Moving eyebolt (3
The rope (37) is hung on 9) and is lifted by the lifting device (36) and inserted from the top or bottom of the molding machine. The lifting brings both the middle sized (1) and (2) close to the moving side frame (9). The moving side key (44) is set so that the moving side key groove (45) fits into the moving side key (44), and then the moving side adapter (40) is fixed by the moving side hinge bolt (43). Next, the rope (37) and the fixed eyebolt (3
After removing 8), close the mold. By closing the mold,
The fixed side back plate (10) is in close contact with the fixed side frame (8), and at the same time, the fixed side middle plate (12) is fixed side hinge bolt (4).
It is fixed to the fixed side by 2). Finally, as shown in FIG. 5, the feeder opening tube (78), the feeder closing tube (80), the filling tube (82) and the filling hose (76) are connected to each other and the mold is attached to complete the die exchange. To do. The mold removal process proceeds in the reverse order of the above.

As described above, it is understood that the master frame type mold is more rational in mold exchange than the dedicated frame type mold. However, even in the master frame type mold, the following problems are still unsolved.

(A) When lifting or suspending a medium-sized machine between die plates of a molding machine, an operator climbs to the top of the molding machine to work by hand in order to guide it by hand to set a swing stop or a target location. Need to

(B) Due to the displacement of the center of gravity when the die is suspended, the die is tilted rearward, and it takes time and labor to perform centering work to fit it into the key on the moving side, which requires skill. Including the above (A), at least two people are required as a type change worker.

(C) The attachment and detachment of the tube and hose for the feeder are the same as those of the normal dedicated frame system, and it takes time and effort, and improvement is required.

"Means for Solving Problems" The present invention provides a mold replacement method for solving the problems in the above master frame type mold.

That is, the present invention comprises a master frame method in which the fixed-side middle die (1), the moving-side middle die (2), the fixed-side middle plate (12) for fixing them, and the moving-side middle plate (13) can be commonly used. The fixed side steam pipe (14) is attached to the frame (8),
All or part of the fixed side cooling water pipe (16) and the fixed side drain pipe (19), the moving side steam pipe (15), the moving side cooling water pipe (17), and the moving side drain pipe in the moving side frame (9). All or part of (20) is connected and fixed, and from the rear surface of the fixed side frame (8), the fixed side mid die (1), the moving side mid die (2), the fixed side back plate (10), and the feeder (25).
And the eject pin (26) are set in advance and conveyed to the inside of the fixed side frame (8) and the moving side frame (9), and the moving side middle plate (13) is temporarily fixed and held by the moving side frame (9). The present invention is concerned with a method for exchanging a mold for an in-mold foam molding machine, which comprises opening the mold and finally tightening.

The feature of the present invention is that, instead of the conventional method of hanging a mold by inserting, removing, and attaching to and from a molding machine, a mold in which a feeder, an eject pin, or the like is set in advance is used as a stationary frame (8). The point is that the method of transporting from the back to the inside of the frame is adopted.

"Example" The fourth embodiment will be described with reference to FIG. 4 showing an embodiment of the present invention.
The figure shows a state where the mold is attached to the molding machine.

A master frame is attached to the molding machine. As the mold, the moving-side middle mold (2) is closely attached to the fixed-side middle mold (1) and incorporated. In this state, the moving side medium size (2)
Has a large frictional resistance in the contact portion with the fixed-side medium size (1), and there is no deviation or detachment. As for the structure of the mold, as shown in FIGS. 5 and 6, the moving side middle mold (2) is fixed by bolts by the moving side middle plate (13).

The fixed-side middle die (1) is fixed with bolts by the fixed-side middle plate (12), and the fixed-side middle plate (12) is fixed to the fixed-side back plate (1).
0) and the fixed side support (23). The fixed side back plate (10) is fixed to the fixed side back plate mounting frame (hereinafter, abbreviated as mounting frame) (72) with bolts.
The mounting frame (72) presses against terminal crevices generated on the fixed side back plate (10) during pressurization in the mold to prevent vapor leakage. The mounting frame (72) is provided with a mounting frame holding rod (73). The mounting frame holding rod (73) and the mounting frame one-touch joint (50) provided at the tip of the mold supporting shaft (hereinafter, shaft) (51) provided on the carriage are
Male and female fitting type one-touch structure is connected. A commercially available product can be used for the male-female fitting one-touch structure. The shaft (51) is inserted into a support shaft sleeve (hereinafter, abbreviated as sleeve) (52). There are two left and right upper and two left and right lower respectively, a total of four, and the shaft (51) is a sleeve. It is constructed so that it can slide in (52). The sleeve (52) is attached to the front stand (5
3) and the left and right two stands of the rear stand (54), a stand supported by a total of four stands,
It is fixed to a support table (abbreviated as "59"). A caster (60) is provided at the lower part of the support table so that it can be moved. Fixed side back plate (10) when the dolly approaches the molding machine
The front stand (53) comes in contact with the eject bar (61) and the lower horizontal frame (62) of the eject beam so that the front stand (53) cannot approach them, so the eject bar (61) is removed. Further, the lower horizontal frame (62) of the eject beam has a structure in which one is detachable and the other is a structure that can rotate 90 ° by a pin support system.

A fixed-side frame (8) and a moving-side frame (9) are provided with a mold including a fixed-side middle mold (1) and a moving-side middle mold (2) as a set.
When installing on, if the mounting core does not match, insertion and removal cannot be performed. Most mounting cores can be taken out, but it is difficult to make fine adjustments. Therefore, the height direction adjustment jig for the front stand (5
5) and a height adjusting jig (56) for the rear stand, and the horizontal direction is a horizontal adjusting jig (57) for the front stand and a horizontal adjusting jig (58) for the rear stand.
Is provided.

The matters other than the above regarding the mold structure of the present invention will be described with reference to FIG.

(A) The fixed-side middle plate (12) that comes into contact with the (a) part of the fixed-side frame (8) at a corner, and in some cases, 2-10 mm of the (b) part of the brim part of the fixed-side middle mold (1). Chamfer. This is necessary for smooth sliding insertion.

(B) The fixed-side middle plate seal packing (hereinafter, referred to as "the fixed-side frame (8)" and the fixed-side middle plate (12) are in surface contact with each other.
A middle plate seal (abbreviation) (70) is provided. On the other hand, if the seal in the surface contacting portion is not sufficient, steam leakage during heating or pressurized air leakage during mold release may occur, causing heating or mold release trouble.

(C) Installation of a fixed side dedicated cooling water pipe (hereinafter, abbreviated as dedicated cooling water pipe) (41). The fixed side cooling water pipe (16) is provided via the fixed side frame (8), but since the cooling is insufficient, the dedicated cooling water pipe (41) is provided via the fixed side back plate (10). The cooling water pipes of the two systems in the stationary steam chamber (6) are provided with cooling water nozzles (18) at optimal positions where the stationary middle mold (1) can be cooled by water spray.

(D) The fixed side back plate mounting frame (72) includes a fixed side back plate mounting frame holding clamp (hereinafter abbreviated as a clamp) (74) and a fixed side back plate mounting frame holding clamp bolt (hereinafter referred to as a clamp bolt). ) (75) fixed side die plate (3
It is fixed to 0).

(E) In the case of crossover, the feeder (25) and pin (26) are used as shown in FIG. 5 in this method. At the same time, it will be possible to perform conversation including the tube manifold. There are the following three systems for driving the feeder (25).

Feeder opening tube one-touch fitting (hereinafter referred to as opening tube fitting) (79) → feeder opening tube (hereinafter referred to as opening tube) (78) → feeder opening tube manifold (hereinafter referred to as opening manifold) ) (84) Feeder closing tube one-touch fitting (hereinafter referred to as closing tube fitting) (81) → feeder closing tube (hereinafter referred to as closing tube) (80) → feeder closing tube manifold (hereinafter referred to as closing) (86) Filling tube one-touch fitting (hereinafter, filling tube fitting) (83) → Filling tube (hereinafter, filling tube) (82) → Filling tube manifold (hereinafter, filling manifold) (88).

For the above three lines, the feeder (2
Although the tubes are attached and detached from the respective one-touch tube joints (79) (81) (83) provided in 5), since the quantity is large and it takes time and effort to perform on-site mating, in the present invention, in advance. Each manifold (84) (86) (8
8) Set up and prepare up to 8), and at the site, attach and detach the main valves (90) (91) (92) for each manifold and the one-touch joints (85) (87) (89) for each manifold at the site. You can save a lot of time and effort in the
This is the preferred embodiment.

(F) Many one-touch methods of the hose joint (77) have been proposed, and it is preferable to adopt these known one-touch joints also in the present invention.

(G) The size of the moving side intermediate plate (13) must be smaller than the size of the intermediate plate seal (70). That is, as shown in FIG. 4, when the mold is inserted and removed from the fixed side die plate (30), the moving side middle plate (13) passes through the middle plate seal (70) to move the moving side frame. The outer size of the moving side intermediate plate (13) needs to be smaller than the outer size of the intermediate plate seal (70) in order to make close contact with (9).

(H) It is necessary that the outer dimension of the movable side middle plate (13) is smaller than the minimum inner dimension of the fixed side frame (8). That is, the moving-side middle mold (2) is closely attached to the fixed-side middle mold (1), passes through the inside of the fixed-side frame (8) from the fixed-side die plate (30), and is attached to and removed from the moving-side frame (9). Therefore, the outer dimension of the movable side middle plate (13) needs to be smaller than the minimum inner dimension of the fixed side frame (8).

(I) A jig for fixing the installation core is provided between the moving side middle plate (13) and the moving side frame (9). As described in (h) above, the moving side medium die (2) is smoothly attached to and detached from the moving side frame (9) while being in close contact with the fixed side medium die (1), but in this case the installation core is not distorted. A moving-side middle plate knock pin (hereinafter, referred to as middle plate knock pin) (93) is provided.

(G) A reverse movement preventing temporary fixing jig is provided between the moving side intermediate plate (13) and the moving side frame (9). Moving side middle plate (13)
How to attach the to the moving frame (9)
And the method described in section (i), but using the moving side middle plate (1
At the time when 3) comes into close contact with the moving side frame (9), it is necessary to be temporarily fixed to the moving side frame (9).
Because, in order to fix the moving side middle plate (13) to the moving side frame (9), the moving side middle plate (13) is fixed to the moving side frame (9) with the moving side hinge bolt in a state where the mold is once opened. This is because it is necessary to move to the middle frame on the moving side (9) in order to stop at (43). An example of this temporary fixing jig is shown in FIG. 7. The moving side frame fixing metal fitting (95) fixed to the moving side frame has a diameter of 8 to 15
A round rod made of metal of mm, provided with a threaded tap hole on the side for fixing the moving side intermediate plate (13), and a cap (96) for a fixing metal fitting which matches the tap hole is screwed. The tip is circular and the head has a groove for driver, which is removable. Backlash prevention metal fittings (97)
Is a donut-shaped metal double-cylinder and has a moving middle plate (13)
It is fixed to the non-return fitting with a fixing bolt (98). In the above structure, the moving side medium die (2) is moved from the fixed side frame (8) to the moving side frame (9) in a state of being in close contact with the fixed side medium die (1), and the moving side medium die (2) is moved to the moving side frame. Cap (96) for fixing metal fittings when close to (9)
Passes through the inner cylinder of the backward movement preventing metal fitting (97) and exits at the opening. At the time when the entire head of the fixing metal cap (96) is exposed to the opening, the inner cylinder of the reverse movement preventing metal fitting (97) and the fixing metal cap (96) are engaged, and the moving side intermediate plate (13) moves. The side frame (9) is temporarily fixed. When the mold is further opened in this state, the movable middle mold (2) smoothly supports the load by the knock pin (93), and therefore smoothly moves into close contact with the movable frame. At the time of moving closely, the moving side middle plate (13) is fixed to the moving side frame (9) by the moving side hinge bolts (43).

The method of moving and removing the moving side middle mold (2) to the fixed side middle mold (1) is to remove the moving side middle plate (13) fixing bolt and the fixing metal cap (96) with the mold opened, and close the mold. Then, the moving-side middle mold (2) closely moves to the fixed-side middle mold (1). Even if the bolts for fixing the moving side intermediate plate (13) are removed, the bolts do not fall down because the knock pins (93) support the load.

Although the embodiments have been described above, it goes without saying that many variations are possible without departing from the spirit of the present invention.

[Operation / Effect] The present invention has a wide range by adopting a method in which the fixed-side middle mold and the moving-side middle mold are put in and taken out from the fixed-side frame rear surface without attaching the mold as in the conventional method and then attached and detached. It achieves labor saving, and further adopts a die exchange system that includes a tube manifold for the feeder, steam,
If the water and drain pipes are fixed to both the fixed side frame and the moving side frame and the mold exchange is performed, the amount of work for attaching and detaching the mold to and from the molding machine is significantly reduced compared to the conventional method. Quantitatively, depending on the work environment and skill level, it is necessary to attach / detach the pattern 1
It is estimated that it takes about 30 minutes for human work. At the same time, the work of mounting and removing molds, steam, and water pipes at the top of the molding machine will be eliminated, and work stability and work environment will be improved at the same time. Further, as a result of shortening the die-interchange time, it also contributes to the improvement of the productivity of the molding machine, which is of great industrial significance.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of a normal mold, FIG. 2 is a schematic diagram showing the mold interchange of a normal mold, and FIG. 3 is a schematic diagram showing the mold interchange diagram of a normal shared frame mold. FIG. 4 is a schematic diagram showing a mold interlock of the present invention, FIG. 5 is a schematic diagram showing a molding machine of the present invention and a stationary side mold structure, and FIG. 6 is a molding machine of the present invention and a moving side mold structure. FIG. 7 is a schematic diagram showing a reverse movement preventing temporary fixing jig in the present invention. 1 …… Fixed side medium type, 2 …… Movement side medium type 3 …… Molded product chamber, 4 …… Slit 5 …… Parting line, 6 …… Fixed side steam chamber 7 …… Movement side steam chamber, 8 …… Fixed Side frame 9 …… Movement side frame, 10 …… Fixed side back plate 11 …… Movement side back plate, 12 …… Fixed side middle plate 13 …… Movement side middle plate, 14 …… Fixed side steam pipe 15 …… Movement Side steam pipe, 16 …… Fixed side cooling water pipe 17 …… Moving side cooling water pipe, 18 …… Cooling water nozzle 19 …… Fixed side drain pipe, 20 …… Moving side drain pipe 21 …… Fixed side drain valve, 22… … Moving side drain valve 23 …… Fixed side support, 24 …… Moving side support 25 …… Feeder, 26 …… Eject pin 30 …… Fixed side die plate 31 …… Moving side die plate 32 …… Eject beam, 33 …… Mold opening / closing cylinder 34 …… tie bar, 35 …… ejecting bar 36 …… lifting device, 37 …… rope 38 …… fixed side ivo Lt, 39 …… Movement side eyebolt 40 …… Movement side adapter, 41 …… Cooling water pipe for fixed side 42 …… Fixed side hinge bolt 43 …… Movement side hinge bolt 44 …… Movement side key, 45 …… Movement side key groove 50 …… One-touch fitting for mounting frame 51 …… Mold support shaft 52 …… Support shaft sleeve 53 …… Front stand, 54 …… Rear stand 55 …… Height adjustment jig for front stand 56 …… Rear Height adjustment jig for side stand 57 …… Horizontal adjustment jig for front stand 58 …… Horizontal adjustment jig for rear stand 59 …… Stand support, 60 …… Caster 61 …… Eject bar 62 …… Eject beam Lower horizontal frame 70 …… Fixed side middle plate seal packing 71 …… Fixed side back plate seal packing 72 …… Fixed side back plate mounting frame 73 …… Fixed side back plate mounting frame Holding rod 74 …… Fixed side back Plate mounting frame holding clamp 75 …… Fixed Bolts for clamping the side back plate mounting frame 76 …… Filling hose 77 …… Filling hose One-touch fitting 78 …… Feeder opening tube 79 …… Feeder opening tube One-touch fitting 80 …… Feeder closing tube 81 …… Feeder closing tube One-touch fitting 82 …… Filling tube 83 …… Filling tube One-touch fitting 84 …… Feeder opening tube Manifold 85 …… Feeder opening tube Manifold fitting 86 …… Feeder closing tube manifold 87 …… Feeder closing tube manifold one-touch fitting 88 …… Filling tube manifold 89 …… Filling tube manifold one-touch fitting 90 …… Feeder opening tube manifold main valve 91 …… Feeder closing tube manifold main valve 92 …… Filling Tube Manifold Main Valve 93… Knock pin moving side plate 94 ...... movable-side frame fixing metal fitting 95 ...... mounting frame fixing bolt 96 ...... fixing bracket cap 97 ...... reversing prevention brackets 98 ...... check fitting bolt

Claims (1)

[Claims] 1. A fixed-side middle die (1), a moving-side middle die (2), a fixed-side middle plate (12) for fixing these, and a moving-side middle plate (1).
3) consists of a master frame system that can be used in common,
The stationary frame (8) includes all or part of the stationary steam pipe (14), the stationary cooling water pipe (16), and the stationary drain pipe (19), and the moving frame (9) includes the moving steam pipe. (15), the moving side cooling water pipe (17), and the moving side drain pipe (20) are connected or fixed in whole or in part, and from the rear surface of the fixed side frame (8), the fixed side mid-size (1) and the moving side mid-size (2), fixed side back plate (10), feeder (25), and eject pin (26) are set in advance and are conveyed to the inside of the fixed side frame (8) and the moving side frame (9), and the moving side middle A method of exchanging a mold for an in-mold foam molding machine, which comprises temporarily holding a plate (13) on a moving side frame (9), then opening the mold, and finally tightening.