JPH0444337Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) The invention is RIM (reaction injection molding)
The present invention relates to a molding apparatus used in a synthetic resin molding method commonly referred to as ``mixing head'' and a mold, which is equipped with a mixing head and a mold, and in which the head can be attached to and detached from the mold using a head attachment/detachment device.

(Prior art) Conventionally, in a RIM molding device, the means for attaching the mixing head to the mold is generally to fit the uneven portions for positioning provided on the head and the mold into each other, and to attach the head with bolts. It is fixed to the mold with.

Therefore, bolt operation is required to attach and detach the mixing head, which is extremely time-consuming and inefficient work.

(Problems to be Solved by the Invention) An object of the invention is to provide a molding apparatus in which the mixing head can be easily and efficiently attached to and removed from the mold.

(Means for Solving the Problems) The present invention provides a molding apparatus comprising a mixing head and a mold, and in which the head can be attached to and detached from the mold by a head attaching and detaching device. A cam rotatably supported on one of the head and the mold, and a cam follower provided on the other of the head and the mold and capable of engaging with the cam, The present invention relates to a molding device characterized in that the head can be brought into close contact with the mold through engagement between a cam and a cam follower.

According to an embodiment of the present invention, the cam in the head attaching/detaching device has a curved concave cam surface, the cam follower is a pin capable of engaging with the cam surface, and the rotation of the cam causes the cam surface to The head is brought into close contact with the mold by engaging the pin.

According to another embodiment of the present invention, the cam in the head attaching/detaching device is rotatably supported by the mold via a head support frame, the cam follower is fixed to the head, and the cam is rotatably supported by the mold via a head support frame. The support frame can support the head together with the cam follower so that it can be removed and moved toward the mold, and the cam rotates while abutting the cam follower supported by the head support frame. The head can be brought into close contact with the mold by pushing the cam follower.

According to the molding apparatus of the present invention, the mixing head is arranged corresponding to a predetermined part of the mold, and
When the cam is rotated while being engaged with the cam follower, the mixing head is brought into close contact with a predetermined portion of the mold, and a state is created in which the raw material liquid can be supplied.

Further, by rotating the cam in the opposite direction to disengage the cam and the cam follower, the mixing head can be easily removed from the mold.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

The illustrated embodiments are all RIM molding apparatuses for molding polyurethane bumpers for automobiles.

First, the embodiment shown in FIGS. 1 and 2 will be described. This device is a lower part of a mold 1 which is known per se and has an openable and closable upper mold (not shown) and a lower mold 12 in a stationary arrangement. The mixing head 2 can be attached to and detached from the mold 12.

The upper and lower molds of the mold 1 can form a bumper molding cavity by the closing operation of the upper mold.

The mixing head 2 is provided with a raw material liquid passage (not shown), and the opening and closing of this passage is controlled by movement of a valve body (not shown) in the head. The first stock solution supply and return pipes 21 and 22 and the second stock solution supply and return pipes 23 and 24 are connected to the unillustrated passage of the head. The head 2 also has a valve body drive oil supply and return pipe 2.
5 and 26 are connected. The upper surface of the head 2 is provided with an opening 27 through which the two stock solutions are mixed and discharged, and a groove-shaped passage 28 extending from the opening toward the lower mold 12.

A positioning protrusion 29 is provided on the front surface of the head 2 and can be fitted into a recess 122 in the head mounting surface 121 of the lower mold 12. Such a structure of the head 2 is already known.

The upper surface of the lower mold 12 is provided with a channel-shaped passageway 124 leading to the lower mold cavity 123, which passageway is also positioned to communicate with the passageway 28 on the head.

The head 2 can be attached to and detached from the lower mold 12 by a head attachment/detachment device 3.

The attachment/detachment device 3 includes a horizontal arm 31 fixed to the rear surface of the head 2, a cam 33 rotatably supported at both ends of the arm, a pair of arms 34 protruding from the lower die 12, and ends of each arm. It consists of a pin 35 as a cam follower fixedly attached to the cam follower.

As can be seen from FIG. 2, the cam 33 has a concave cam surface 331 on the inside of its front end. This cam surface is
It is formed in an arc shape centered on a point 02 which is slightly offset from the rotation center 01 of the cam, and the protrusion 29 on the front surface of the head is fitted into the recess 122 of the lower die 12 to position the lever 32 vertically in the figure. When the lever is turned toward the side, the pin 35 starts to engage with the cam surface entrance 332, and when the lever is turned further, the pin 35 is pulled toward the front, and the head 2 is pulled toward the mold 1 side. It is formed so that it can be strongly engaged.

According to this molding apparatus, the upper mold (not shown) of the mold 1 is opened, the front protrusion 29 of the head 2 is fitted into the recess 122 of the lower mold 12 to position the head 2, and the lever of the attachment/detachment device 3 is pressed. By simply manually turning the rear end of the head 32 downward, the cam surface 331 engages with the pin 35, and the head 2 is strongly drawn toward the lower die 12 and tightly fixed there.

In this state, there is no longer a gap between the front surface of the head 2 and the head mounting surface 121 of the lower mold 12 through which the raw material liquid can flow.

In this state, the upper mold is closed to form a bumper molding cavity. A part of the upper mold is in close contact with the upper surface of the head 2 and closes off the discharge opening 27 and the groove-shaped passages 28 and 124 above. Driving oil is appropriately flowed through the pipes 25 and 26, and a valve body (not shown) in the head is arranged so as to supply the stock solution to the molding cavity. In other words, it is placed in a position where the raw material liquid can be discharged from the liquid discharge port 27.

Thereafter, the first and second raw material liquids are supplied into the head 2 from the pipes 21 and 23, and are discharged from the discharge port 27 while being mixed.

When a predetermined amount of raw material is injected, the valve body driving oil is flowed in the opposite direction to move the valve body, the first stock solution is returned through the return pipe 22, and the second stock solution is returned through the return pipe 2.
3 and the raw material supply from the discharge port 27 is stopped.

The mixed liquid thus supplied is supplied to the groove-shaped passageway 1 of the upper die and the groove-shaped passageway 1 of the lower die 12 (not shown).
24 into the cavity, and is then foamed and hardened to obtain a predetermined molded product.

The molded product is removed by a known method by opening the upper mold.

When it becomes necessary to remove the head 2 for cleaning the head, etc., rotate the operation lever 32 of the attachment/detachment device 3 upward, rotate the cam 33 in the opposite direction, and then remove the pin 35.
The head can be detached from the mold 1 very easily by simply removing it from the mold 1.

Next, another embodiment will be described based on FIGS. 3 and 4.

According to this embodiment, the mixing head 6 can be attached to and removed from the lower mold 52 of the mold 5, which is provided with an openable and closable upper mold (not shown) and a stationary lower mold 52, which are known per se.

The upper and lower molds can form a bumper molding cavity by the closing operation of the upper mold. The mixing head 6 is provided with a raw material liquid passage (not shown), and the opening and closing of this passage is controlled by movement of a valve body (not shown). Pipes 61 and 62 for supplying a first stock solution and a second stock solution are connected to the passage of the head 6, and pipes 63 and 64 for supplying and returning valve driving oil are connected to the head 6. has been done. The front surface of the head 6 is provided with an opening 65 through which two stock solutions are mixed and discharged. The head front portion 66, which includes the mouth 65, is cylindrical in shape and can fit into the head mounting circular recess 522 of the lower mold 52. Such a structure of the head 6 is also already known.

The bottom surface of the recess 522 of the lower mold 52 is provided with a passage leading to the molding cavity.

The head 6 can be attached to and detached from the lower die 52 by means of a head attaching and detaching device 7.

The attachment/detachment device 7 includes a head support frame 71 fixed to the lower die 52, a pair of cams 72 rotatably attached to the support frame, an operating lever 73 for rotating the cams, and a head support frame 71 fixed to the head 6. A pair of cam followers 74 are provided.

The support frame 71 has longitudinal grooves 711 on both sides.
The cam follower 74 fixed to the head is a plate extending to the left and right of the head. This plate 74 can be loosely fitted into the longitudinal groove 711 of the support frame from above, and can be moved in the front-rear direction in a loosely fitted state. When moving forward, the head front part 66 fits into the recess 522 of the lower mold 52, and when moving backward, the head front part 66 is detached from the recess 522, and the plate body 7
4 can be pulled out of the support frame.

The lower end of each support frame longitudinal groove 711 is cut out, and a cam 72 is provided there. cam 7
2 is a plate 74 whose front surface fits into the groove 711;
The cam is formed so that it can be engaged in contact with the rear surface, and the front surface of the cam moves forward by downward rotation of the lever 73, in other words, the thickness of the cam in the portion that contacts the plate body 74 gradually increases. , thereby advancing the plate 74 and therefore the head 6,
The head front portion 66 can be brought into close contact with the lower die recess 522.

According to this molding apparatus, when the upper die (not shown) of the mold 5 is opened, the cam follower 74 fixed to the head is fitted into the head support frame vertical groove 711, and the lever 73 is manually turned downward, each cam is released. 72
abuttingly engages the cam follower 74, the cam follower 74 and the head 6 are pushed firmly toward the lower mold 52, and the head front portion 66 is tightly fitted into the lower mold recess 522. In this state, the front of the head 6 and the lower mold 52 are
There is no longer a gap between which the raw material liquid can leak.

In this state, the upper mold is closed to form a bumper molding cavity, and preparations are made to supply two types of stock solutions into the head through pipes 61 and 62.
The valve driving oil is flowed through the head, and the valve body in the head is arranged so that the raw material liquid can be supplied to the molding cavity. In other words, it is placed in a position where the raw material liquid can be discharged from the liquid discharge port 65.

Then, the first and second raw material liquids are supplied into the head 6 and are discharged from the discharge port 65 while being mixed.

When a predetermined amount of raw material is injected into the molding cavity, the valve element driving oil is flowed in the opposite direction to move the valve element and the raw material supply is stopped.

The liquid mixture thus supplied is supplied into the cavity, and then foamed and hardened to obtain a predetermined molded product.

The molded product is removed by a known method by opening the upper mold.

When it becomes necessary to remove the head 6, the operation lever 73 of the attachment/detachment device 7 is rotated upward and the cam 72 is
7 in the opposite direction and rotate the cam follower 7 of the cam 72.
4, the front part 66 of the head is pulled out from the lower die recess 522, and the plate body 74 is attached to the support frame 7.
It can be easily detached by simply removing it from 1.

In the embodiment shown in FIGS. 3 and 4, the cam 72 has a wedge-shaped portion that gradually increases in thickness, and the cam follower 74 fixed to the head is a flat plate.
This is reversed, that is, the cam 72 is formed flat,
A portion ranging from a thin portion to a thick portion may be formed at a portion on the plate body 74 that comes into contact with this.

(Effects of the invention) According to the invention, it is possible to provide a molding apparatus in which the mixing head can be easily and efficiently attached to and removed from the mold.

[Brief explanation of the drawing]

Figure 1 is a perspective view of essential parts of an embodiment of the present invention;
The figures are a side view of the cam, its operating lever, and a cam follower in the embodiment shown in FIG. 1, FIG. 3 is a perspective view of main parts of another embodiment of the present invention, and FIG. It is a perspective view of the operation lever. 1, 5... Mold, 2, 6... Mixing head, 3, 7... Head attaching/detaching device, 33, 72...
Cam, 35, 74...Cam follower, 331...
...Cam surface, 71...Head support frame.

Claims (1)

[Claims for Utility Model Registration] (1) In a molding device comprising a mixing head and a mold, the head can be attached to and detached from the mold by a head attaching and detaching device, the head attaching and detaching device being able to attach and detach the head and the die. A cam rotatably supported on one of the molds, and a cam follower provided on the other of the head and the mold and capable of engaging with the cam; A molding device characterized in that the device is capable of bringing the head into close contact with the mold by engaging with a cam follower. (2) The cam in the head attachment/detachment device has a curved concave cam surface, and the cam follower is a pin that can engage with the cam surface, and the cam surface engages with the pin by rotation of the cam. The molding apparatus according to claim 1, wherein the head is brought into close contact with the mold. (3) The cam in the head attachment/detachment device is rotatably supported by the mold via a head support frame, the cam follower is fixed to the head, and the head support frame supports the head together with the cam follower. The cam can be supported so as to be detachable and movable toward the mold, and the cam contacts and rotates the cam follower supported by the head support frame while pushing the cam follower to move the head toward the mold. The molding device according to claim 1 of the utility model registration claim, which can be brought into close contact with the molding device.