JP3440614B2 - Molding machine runner lock removal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runner lock removing device for a molding machine.

[0002]

2. Description of the Related Art Generally, a mold of a type called a sleep rate mold needs to lock a runner when cutting a gate. The locked runner must be discharged as scrap and the runner lock must be removed.

FIG. 1 shows the structure of a general sleep rate mold. 1 is a lower mold that can be moved up and down, 2 is an upper mold, 3
Is a runner stripper, 4 is a mounting plate fixed at a fixed position, 5 is a sprue bush, and 6 is a runner lock pin. The molds 1 and 2 are connected by a tension link 7, and the mounting plate 4
The upper die 2 and the upper die 2 are connected by a guide shaft 8 and a stop bolt 9 via a runner stripper 3. The runner lock pin 6 fixed to the mounting plate 4 penetrates the runner stripper 3 and projects into the runner. In addition, 10 is the upper die 2 and the runner stripper 3
It is a support pin that slides up and down.

A method of molding and taking out a resin component with the above sleep rate mold will be described with reference to FIGS. 1 and 2 (A) to 2 (C). First, as shown in FIG. 1, the nozzle 11 is pressed against the upper surface of the sprue bush 5 and the molten resin is injected. The molten resin passes through the runner L formed between the runner stripper 3 and the upper mold 2, and is supplied to the cavity C formed between the upper and lower molds 1 and 2. When the lower die 1 is moved downward after the resin is cured, the gap between the runner stripper 3 and the upper die 2 is opened as shown in FIG.
Is cut. At this time, the resin in the runner L is locked by the runner lock pin 6 and is in close contact with the lower surface of the runner stripper 3. Further, when the lower mold 1 moves, the space between the upper mold 2 and the lower mold 1 is opened as shown in FIG. 2B, and the upper surface of the molded product M is exposed. Furthermore, lower mold 1
When is moved, the pulling link 7 pulls the upper mold 2 downward. Therefore, as shown in FIG. 2C, the runner stripper 3 fixed to the upper end of the guide shaft 8 is also pulled downward and moved downward by the stop bolt 9 until stopped. As a result, the runner stripper 3 is separated from the lower surface of the mounting plate 4, and the lower end portion of the runner lock pin 6 fixed to the mounting plate 4 is pulled out from the resin scrap R. As a result, the resin waste R is removed from the runner stripper 3. The molded product M is pushed up from the lower mold 1 by the ejector pin 12 in conjunction with the removal of the resin waste R.

[0005]

As described above, in the conventional sleep rate die, in addition to the four elements such as the lower die 1, the upper die 2, the runner stripper 3 and the fixed mounting plate 4, the die 1 is used. , 2 are connected, the mounting plate 4, the runner stripper 3, the guide shaft 8 connecting the upper die 2 and the stop bolt 9 are large in number, and the structure is very complicated. Moreover, since the amount of mold opening is restricted by the pulling link 7, the amount of mold opening cannot be sufficiently taken, and there is a drawback that it takes time to take out a molded product or resin scrap.

Therefore, the present invention has been made to solve the drawbacks of the sleep rate mold, and its purpose is to easily obtain a sufficient mold opening amount, a small number of parts, and a simple structure of a runner for a molding machine. To provide a lock removing device.

[0007]

In order to achieve the above object, the present invention provides a cavity between a first mold and a first mold which can be contacted with and separated from the first mold in the front-rear direction. And a second mold forming a mold, and a runner stripper that is provided behind the first mold so as to be able to come into contact with and separate from the first mold in the front-rear direction, and forms a runner with the first mold, and is movable in the front-rear direction and melts. A nozzle for injecting resin and a molten resin injected from the nozzle,
The present invention relates to a molding machine equipped with a sprue bush that is supplied to a runner and a runner lock pin that penetrates a runner stripper and has a tip portion that locks resin that has flowed into the runner. The runner lock removing device of the present invention is movable in the front-rear direction with respect to the runner stripper, and a connecting member that integrally connects the runner lock pin and the sprue bush,
A biasing spring that biases the connecting member toward the runner stripper in the backward direction is provided, and the nozzle moves forward to press the sprue bush, and the connecting member acts as the runner stripper.
Advancing the runner lock pin to abut a lock position to plunge the tip of the runner lock pin in the runner, that the nozzle is retracted, the runner lock pin by an urging spring, sprue bushing and the connecting member la
The runner of the molding machine is characterized in that the runner lock pin can be moved back and forth with respect to the inner stripper and moved to and from the lock release position where the runner lock pin is pulled out from the resin inside the runner.
A nerlock removal device is provided. In the above runner lock removing device, the first mold is a movable mold that can move in the front-rear direction, the second mold is a fixed mold that is installed at a fixed position, and the first mold can be slid back and forth on the runner stripper. The first mold and the second mold when the mold is opened.
A guide shaft that holds the intermediate position with respect to the nurse stripper may be provided so as to project forward, and a mounting plate that restricts the retracted position of the connecting member may be fixed to the rear surface of the runner stripper. Also,
A mold clamping member that presses the mounting plate forward to perform mold clamping is arranged behind the mounting plate, and the nozzle is used to move the nozzle forward and backward with respect to the mold clamping member. It is desirable to provide a cylinder.

[0008]

When the molten resin is injected from the nozzle into the cavity through the sprue bush and then the mold opening is started, the space between the first mold and the runner stripper is first opened to expose the runner. Furthermore, if the mold opening is continued,
The second mold is opened and the molded product is exposed. Then, when the nozzle releases the pressing force to the sprue bush, the connecting member moves rearward with respect to the runner stripper by the biasing spring. As a result, the runner lock pin is pulled out from the runner, and the runner is removed. In this way, the runner lock pin is thrust into the runner by utilizing the nozzle touch force, and the nozzle touch force is released, whereby the runner lock pin is pulled out by the biasing spring.

[0009]

FIG. 3 shows an example of a molding machine according to the present invention.
In FIG. 3, reference numeral 20 is a molding machine main body, 21 is an elevating table which is a mold clamping member, 22 is a support column for supporting the elevating table 21, 23 is a nozzle forward / backward moving cylinder fixed on the elevating table 21, 24
Is a screw cylinder for injection molding which is vertically driven by the cylinder 23, 25 is a nozzle provided at the lower end of the screw cylinder 24, and 26 is a screw cylinder 24.
Is a motor that drives the resin to inject resin. Molding machine body 2
0 between the upper surface of 0 and the lower surface of the lifting table 21.
0 is placed. Posts 22 that support the lifting table 21
Is driven up and down by a driving means (not shown) arranged inside the molding machine main body 20, so that the elevating table 21 can clamp the mold die 30 and perform mold opening.

Next, regarding each part of the molding die 30,
Detailed description. As shown in FIG. 4, the molding die 30 generally has
A first mold 31 that can move in the vertical direction, a second mold that is installed at a fixed position and forms a cavity C with the first mold 31.
A mold strip 32, a runner stripper 33 which is provided on the upper part of the first mold 31 so as to be able to come into contact with and separate from each other in the vertical direction and forms a runner L with the first mold 31, and receives a molten resin injected from a nozzle 25. , A sprue bush 34 supplied to the runner L and a runner stripper 33 are penetrated, and a tip end portion is composed of a runner lock pin 35 for locking the resin flowing into the runner L.

A guide shaft 36 extends through one side of the first mold 31 so as to be vertically slidable. The upper end of the guide shaft 36 is fixed to the runner stripper 33, and the lower end has a flange 36a for preventing the first mold 31 from coming off. On the upper surface of the runner stripper 33, a movable side mounting plate 37 mounted on the lower surface of the lift table 21 is fixed. A runner lock plate 38, which is a connecting member, is vertically movably arranged in a space formed between the mounting plate 37 and the runner stripper 33.

The sprue bush 34 and the runner lock pin 35 are fixed to the runner lock plate 38, and a spring 39 is arranged between the runner lock plate 38 and the runner stripper 33. Therefore, the sprue bush 34, the runner lock pin 35, and the runner lock plate 38 are always urged upward by the spring 39. When the mold is opened, the upper surface of the runner lock plate 38 is raised by the spring 39 to a position where it comes into contact with the lower surface of the mounting plate 37, and the tip of the runner lock pin 35 is retracted upward from the lower surface of the runner stripper 33 (lock release position). )It is in. On the other hand, when clamping the mold, the sprue bush 34 and the runner lock pin 35 are applied by the nozzle touch force.
The runner lock plate 38 moves downward while integrally compressing the spring 39, and the lower surface of the runner lock plate 38 contacts the upper surface of the runner stripper 33 and stops. At this time, the tip of the runner lock pin 35 projects from the lower surface of the runner stripper 33 (lock position), and the lower end surface of the sprue bush 34 is flush with the lower surface of the runner stripper 33.

The second mold 32 is composed of a fixed side mounting plate 40, a spacer block 41, a receiving plate 42, a mold plate 43, and a core 44, and these members are integrally fixed to the upper surface of the molding machine body 1. There is. A first ejector pin 45 for ejecting a molded product is pierced through the receiving plate 42 and the core 44 so as to be movable up and down.
A second ejector pin 46 for protruding the runner remaining on the upper side 2 is vertically movably penetrated. The lower end portions of these ejector pins 45 and 46 are both ejector plate 4
Supported by 7. The ejector plate 47 is integrally pushed up by a push-up pin 48 described later. An escape hole 49 into which the lower end of the guide shaft 36 can be inserted is formed on one side of the second mold 32.
An upright support pin 50 is provided on the other side so as to project. The upper end of the support pin 50 is inserted into the hole 31a of the first mold 31 to position the first mold 31.

Next, the operation of the molding machine having the above construction will be described with reference to FIG. First, the elevating table 21 is lowered with the nozzle 25 retracted upward, and the runner stripper 33, the first mold 31, and the second mold 32 are inserted via the movable side mounting plate 37.
Press to clamp the mold. Then, the nozzle 25 is advanced and the tip thereof is pressed against the sprue bush 34. At this time, the nozzle touching force on the sprue bush 34 causes the runner lock pin 35 and the runner lock plate 38 to move downward together, compressing the spring 39. In this state, when the molten resin is sent from the nozzle 25 to the sprue bush 34, the molten resin is melted.
It flows into the cavity C from 4 through the runner L. This state is shown in FIG.

After the resin is cured, the mold opening is started. That is, when the lift table 21 is raised, the movable side mounting plate 37 and the runner stripper 33 follow and rise, and the first parting surface between the runner stripper 33 and the first die 31 is opened. As a result, the gate is cut. This state is shown in FIG. At this time, the resin scrap R cured in the runner L is attached to the lower surface side of the runner stripper 33 by the runner lock pin 35. In this state, since the nozzle forward / backward moving cylinder 23 is stopped and the elevating table 21 and the nozzle 25 are integrally raised, the runner lock pin 35 is at the lock position.

When the elevating table 21 is further raised to the top dead center, the lower end flange 36a of the guide shaft 36 supports the lower surface of the first die 31, so that the first die 31 as well as the elevating table 21 rises and the first die 31 rises. The second parting surface between the mold 31 and the second mold 32 is opened. This state is shown in FIG. At this time, the molded product M is exposed on the upper surface of the second mold 32.

Next, while the lift table 21 is stopped at the top dead center, the nozzle forward / backward moving cylinder 23 is driven to raise the nozzle 25 with respect to the lift table 21. This releases the nozzle touch force, so the sprue bush 3
4. The runner lock pin 35 and the runner lock plate 38 are integrally moved upward by the spring 39. Therefore, the tip of the runner lock pin 35 is pulled out from the resin scrap R, and the resin scrap R is removed (lock release). In addition, in parallel with this, the ejector plate 47
Are lifted together by the push-up pin 48, and the ejector pins 45 and 46 are pushed up. Therefore, the molded product M on the second mold 32 is also removed. This state is shown in Figure 5.
(D).

As described above, since the runner lock is performed by utilizing the nozzle touch force and the runner lock is released by releasing the nozzle touch force, the mold structure is simplified and the tension link 7 is provided. (See Figure 1)
By eliminating the above, it is possible to increase the mold opening amount S between the first mold 31 and the second mold 32. Further, by omitting the conventional stop bolt 9 (see FIG. 1), it is possible to increase the mold opening amount between the runner stripper 33 and the first mold 31. For example, at the stage of FIG. 5 (D), As shown by the chain double-dashed line, by introducing a tray T or the like for receiving the resin scrap R, it is possible to prevent the resin scrap R from dropping onto the first mold 31. as a result,
The removal work of the resin waste R can be automated, the removal work time can be shortened, and the work efficiency can be greatly improved. In addition,
In the above-described embodiment, the nozzle touch force is released (release of the runner lock) after the lifting platform 21 reaches the top dead center, but before the lifting platform 21 reaches the top dead center (for example, FIG. 5).
It is also possible to carry out in step (B).

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the first mold 31 is a movable mold that can move in the front-rear direction, and the second mold 32 is a fixed mold that is installed at a fixed position. However, similar to the conventional sleep rate mold. Alternatively, the mounting plate 37 fixed to the upper surface of the runner stripper 33 may be fixed at a fixed position to move the second mold 32 up and down. Further, it is needless to say that the present invention can be applied not only to the vertical molding machine as in the embodiment but also to a horizontal molding machine. In the above embodiment, in order to simplify the description, the runner lock plate 38 which is a connecting member.
Although the example in which one runner lock pin 35 is fixed is shown in the above, the number of runner lock pins 35 may be increased according to the number and shape of runners. Furthermore, in the above-described embodiment, only the case of producing a resin molded product has been described, but the same applies to the case of performing insert molding.

[0020]

As is apparent from the above description, according to the present invention, the runner lock is performed by utilizing the nozzle touch force, and the runner lock is released by releasing the nozzle touch force. It is possible to omit the tension link and the stop bolt in the sleep rate mold of the first mold, between the first mold and the second mold, and between the runner stripper and the first mold.
A large mold opening amount between the mold and the mold can be secured. Therefore, the work of taking out the molded product or the resin waste becomes easy, the time for taking out the work can be shortened, and the work efficiency can be greatly improved. Also, instead of pulling down the runner stripper through the upper mold by pulling link like a sleep rate mold and releasing the runner lock, the runner lock is released by spring force by releasing the nozzle touch force. The mold structure is simplified and the number of parts can be reduced compared to the mold. Therefore, an inexpensive and highly reliable molding machine can be obtained. Further, since the timing of dropping the resin scraps remaining on the runners can be set arbitrarily, the resin scraps can be easily removed even in the vertical molding machine where it was difficult to remove the resin scraps.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional general sleep rate mold.

FIG. 2 is a cross-sectional view showing a mold opening operation of the sleep rate mold of FIG.

FIG. 3 is a front view of an example of a molding machine according to the present invention in a mold open state.

FIG. 4 is an enlarged sectional view of a molding die in the molding machine of FIG.

FIG. 5 is a cross-sectional view showing the operation of the molding machine according to the present invention.

[Explanation of symbols]

20 Molding machine body 21 Lifting table (clamping member) 23 Nozzle forward and backward cylinder 25 nozzles 30 Mold 31 1st mold 32 Second mold 33 runner stripper 34 Sprue Bush 35 runner lock pin 38 Runner lock plate (connecting member) 39 spring (biasing spring)

Claims (3)

(57) [Claims] 1. A first mold, a second mold which can be brought into contact with and separated from the first mold in the front-rear direction, and forms a cavity between the first mold, and the back of the first mold. The runner stripper, which is provided so as to be able to contact and separate in the front-rear direction and forms a runner with the first mold, the nozzle which is movable in the front-rear direction, injects the molten resin, and the molten resin injected from the nozzle. In a molding machine equipped with a sprue bush that receives and supplies to the runner, and a runner lock pin that penetrates the runner stripper and locks the resin that the tip has flowed into the runner, in the front-back direction with respect to the runner stripper, A connecting member that integrally connects the runner lock pin and the sprue bush, and the above runner lock pin, sprue bush, and connecting member in the backward direction with respect to the runner stripper. Provided a biasing spring for biasing presses the sprue bushing by the nozzle is advanced, coupling member advances the run <br/> toner locking pin to abut the runner stripper, runner lock pin tip and a locking position for projects into the runners, the nozzle
By but retracted, the runner lock pin by an urging spring, sprue bushing and the connecting member runner string
A runner lock removing device for a molding machine, wherein the runner lock pin can be moved back and forth with respect to the lid and moved to and from a lock release position where the runner lock pin is pulled out from the resin in the runner. 2. The runner lock removing device for a molding machine according to claim 1, wherein the first die is a movable die movable in the front-rear direction,
The mold is a fixed mold installed at a fixed position. The runner stripper guides the first mold so that it can slide back and forth within a certain range, and the first mold is moved to the second mold when the mold is opened.
The guide shaft that holds the intermediate position between the runner stripper and the runner stripper is projected forward, and the rear surface of the runner stripper regulates the retracted position of the connecting member, and a mounting plate that is movable in the front-back direction is fixed. Runner lock removal device for the molding machine. 3. The runner lock removing device for a molding machine according to claim 2, wherein a mold clamping member for pressing the mounting plate forward to clamp the mold is disposed behind the mounting plate. A runner lock removing device for a molding machine, wherein the member is provided with a nozzle forward-backward moving cylinder for driving the nozzle forward and backward with respect to the mold clamping member.