JPH0514825Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a slide core that constitutes an injection molding device, and in particular takes into consideration good lubricating sliding for the mold that constitutes the injection molding device. This relates to the slide core.

(Prior Art) In injection molding machines that are currently widely used, particularly injection molding machines that form so-called undercuts in products, slide cores are used to form the undercuts. In general, an undercut is a part that appears as a recess or hole in an injection molded product, and is difficult to mold using only the mold that constitutes the injection molding device (this difficulty is due to the difficulty of molding). This occurs when the direction of movement and the direction of the undercut section do not match), and a slide core is required when forming this undercut section.

Injection molding equipment that employs this slide core generally moves the slide core engaged with the angular pin from the injection molded product by moving one mold with an angular pin relative to the other mold. It is structured as follows. In other words, the slide core in this type of injection molding device always slides relative to one mold when opening and closing the molds that make up the injection molding device, and this slide core supports Lubrication of molds that are used in manufacturing has become of considerable importance.

Conventionally, lubrication between this slide core and the mold that supports it was carried out by an operator as necessary while observing the condition of the slide core, but when mass producing injection molded products, This inspection work is extremely troublesome. Not only that, but if this inspection was forgotten, the slide core and the mold supporting it could not be properly lubricated. Moreover, in the case of such conventional injection molding equipment, in order to perform inspection work and lubricate the slide core,
The operation of the injection molding apparatus had to be temporarily stopped, which greatly reduced the efficiency of molded product formation.

Therefore, the inventor conducted extensive research to see if it was possible to achieve good lubrication between the slide core and the mold that supports it using simple means, and as a result, the inventor developed a system that automatically lubricates the slide core itself. The present invention was completed based on the new finding that good lubrication between the slide core and the mold that supports it can be achieved by devising a new method.

(Problems to be solved by the invention) This invention was made in view of the above-mentioned circumstances, and the problems to be solved are the slide core and the mold supporting it in conventional injection molding equipment. This is due to insufficient lubrication.

The purpose of this invention is to create a simple slide core that can provide good lubrication between the slide core and the mold that supports it in injection molding equipment by devising the structure of the slide core itself. It is provided by the structure.

(Means for Solving the Problems) In order to solve the above problems, the means taken by the present invention are explained with reference to FIGS. 1 to 6 corresponding to the embodiments. One mold 10 with
In an injection molding apparatus 100 in which the slide core 30 engaged with the angular pin 11 is retracted from the injection molded product 40 by moving the other mold 20 relative to the angular pin 11, the slide core 30 is lubricated with grease or the like. A storage section 33 for filling the lubricant is formed, and a guide channel 37 for the lubricant is formed on at least one sliding surface of the slide core 30, and the guide channel 37 and the storage section 33 are communicated with each other. one through hole 3
Further, the guide flow path 37 is formed as a single curve that detours around the entire one side of the slide core 30, and lubricant reservoirs 37a are provided at both ends of this curve.
A slide core 30 characterized in that each of these is successively formed. ”.

That is, in the case of the slide core 30 according to the present invention, there is a storage section 33 that stores the lubricant therein.
At the same time, the lubricant in the storage portion 33 is configured to leak into the guide channel 37 through the through hole 36, and the lubricant leached into the guide channel 37 causes the injection molding apparatus to The slide core 30 for the other mold 20 constituting the mold 100
It is designed to provide good lubrication. Furthermore, the slide core 30 of the present invention has its guide channel 37 formed as a single curve that detours around the entire one side of the slide core 30, and has continuous lubricant reservoirs 37a at both ends of this curve. This allows for even better lubrication with the lubricant.

(Functions of the invention) The slide core 30 according to the invention has the following effects.

First, in the slide core 30 according to the present invention, in response to the opening/closing operation between one mold 10 and the other mold 20, the slide core 30 is supported by the other mold 20. It slides in the left-right direction as shown in FIG. That is, one of the molds 10 inserted into the pin insertion hole 32 of the slide core 30
Since the side angular pin 11 is formed obliquely with respect to the opening/closing direction of one mold 10 and the other mold 20, this slide core 30 is guided by the angular pin 11 and the slide core 30
By being guided by the guide 31 relative to the other mold 20, as shown in FIG. 2, it is positively slid relative to the other mold 20 in the left-right direction in the figure.

When this slide core 30 slides with respect to the other mold 20, the storage portion 33 of the slide core 30 is filled with lubricant, and the storage portion 33 is passed through the through hole 36 into the slide core 30. 30, the lubricant in the storage section 33 leaks between the slide core 30 and the other mold 20, and lubricates both. be. In this case, since the guide channel 37 is formed in a curved shape that detours around the entire one side surface of the slide core 30, even if there is only one guide channel 37, the entire outer surface of the slide core 30 can be lubricated. It is.

Further, when the lubricant in the guide channel 37 has been used to some extent, the lubricant in the storage section 33 is sequentially supplied. That is, since the slide core 30 itself has a certain amount of heat due to friction with the other mold 20, the lubricant such as grease in the housing section 33 is in a softened state. There is. Therefore, the lubricant in the storage section 33 is automatically supplied to each guide channel 37 in sequence. In addition, since lubricant reservoirs 37a are continuously formed at both ends of each guide channel 37, surplus lubricant is stored in each of these lubricant reservoirs 37a, and if Even if there is a shortage of lubricant in a portion of the sliding surface far from one through hole 36, the lubricant for the shortage can be immediately supplied from the lubricant stored in each lubricant reservoir 37a. This is what happens. Note that if the storage section 33 is closed by a plug 35, by screwing this plug 35 into the storage section 33, the lubricant inside the storage section 33 will be actively directed into each guide channel 37. leaches into.

(Example) Next, the present invention will be described in detail according to an example shown in the drawings.

Embodiment 1 FIGS. 1 and 2 show an injection molding apparatus 1 employing a slide core 30 according to a first embodiment of the present invention.
A cross-sectional view of 00 is shown. This injection molding device 1
00 is one mold 10 and the other mold 20
A molded product 40 is formed in a cavity formed by one mold 10 and the other mold 20 by relatively moving the molds 10 and 20. This molded product 40 is shown in FIGS. As shown in the figure,
It has an undercut part 41,
The slide core 30 according to the present invention is for actively forming this undercut portion 41.

One mold 10 is always guided in a fixed direction relative to the other mold 20 by a guide pin 21 on the other mold 20 side inserted into a pin guide part 13 of the mold 10. The guide pin 21 is attached to the
It is provided with an angular pin 11 arranged obliquely with respect to the guiding direction. Also, this one mold 10
A stop member 12 having a guide surface 12a on the outer side thereof.
is fixed, and when one mold 10 and the other mold 20 are closed, this stop member 12 pushes the guide surface 38 of each slide core 30 (described later) with its guide surface 12a, and the slide core 30 is firmly pressed against the other mold 20 side.

The other mold 20 is moved relative to the one mold 10 in a fixed direction while being guided by a guide pin 21 inserted into the pin guide part 13 on the one mold 10 side. An ejector pin 22 for taking out the completed molded product 40 is provided approximately at the center thereof. This ejector pin 22 is configured to be extendable and retractable, and is adapted to protrude from the other mold 20 as required. The slide core 30 according to the present invention is arranged on the side of the other mold 20.

The slide core 30 is as shown in FIGS. 3 to 6, and is dovetail-grooved to the other mold 20 side by means of guides 31 formed on the side thereof. It is arranged so that it can freely move left and right while its position in the vertical direction in FIGS. 1 and 2 is defined. That is, although this slide core 30 can move in the horizontal direction as shown in FIG. 1 with respect to the other mold 20, it is not allowed to move up and down. Of course, since this slide core 30 is moved by the angular pin 11 on one side of the mold 10, a pin insertion hole 32 for inserting and removing the angular pin 11 is provided approximately in the center of the slide. It is formed so as to be positioned obliquely to the sliding direction of the core 30.

In addition, the pin insertion hole 32 of this slide core 30
A storage portion 33 for storing a lubricant such as grease is formed at a position that does not interfere with the housing. In this embodiment, a threaded portion 34 is formed in the storage portion 33, and a plug 35 is screwed into this threaded portion 34. That is, by screwing this plug 35 into the threaded portion 34 of the storage portion 33, the inside of the storage portion 33 is closed, and by further screwing the plug 35, the storage volume of the storage portion 33 can be changed. It is made possible to do so.

A guide channel 37 formed on the side surface of the slide core 30 communicates with the storage portion 33 through one through hole 36 . This guide channel 3
7 is formed on the sliding surface with respect to the other mold 20, and is formed at least at the location where the most frictional force is applied, and if necessary, the slide core 30
It may also be formed on the bottom surface.
In other words, in the case of the slide core 30 shown in FIG. 3, an example was shown in which the guide channel 37 was formed only on the side surface of the slide core 30, but the guide channel 37 is formed not only on the side surface of the slide core 30 but also on the side surface of the slide core 30. It may also be formed on the bottom surface. Of course, each guide channel 3
7 must communicate with the storage section 33 via the through hole 36. Furthermore, even if the guide channel 37 is not formed on the bottom surface of the slide core 30,
As shown in FIG. 4, a through hole 36 may be opened in the bottom surface.

Further, the guide flow path 37 in this embodiment is formed in a curved shape that detours around the entire one side surface of the slide core 30, as shown in FIG.
This is because the entire sliding surface of the slide core 30 can be lubricated by one guide flow path 37. Furthermore, in addition to storing surplus lubricant, even if there is a shortage of lubricant in a portion of the sliding surface far from one through hole 36, the insufficient lubricant can be immediately supplied. In order to achieve this, lubricant reservoirs 37a are continuously formed at both ends of the guide flow path 37, respectively.

Note that this slide core 30 is guided by a guide surface 38 formed on one side thereof and by a guide surface 12a on one mold 10 side, and is guided by a guide surface 12a on one mold 10 side.
When the mold 10 and the other mold 20 are closed, the undercut forming portion 39 formed on the other mold is pushed toward the cavity formed by the mold 10 and the mold 20 on the other side. ing.

Embodiment 2 FIGS. 7 to 13 show another embodiment of the slide core 30 according to the present invention.

The difference between the slide core 30 according to the second embodiment and the slide core 30 according to the first embodiment described above is as follows. That is, as shown in FIG. 8, the guide channels 37 formed on the front and back surfaces of the slide core 30 have through holes 36 opened in the center of both the upper and lower ends, and from the right side in the figure. There is. By forming the through hole 36 in the center of both the upper and lower ends of the guide passage 37, the lubricant seeping out from the through hole 36 flows evenly in the upper and lower parts of the guide passage 37, and the slide core It is possible to reliably lubricate the front and back surfaces of 30 with a small amount of lubricant.

In the slide core 30 according to the second embodiment, as shown in FIGS. 9 and 13, two storage portions 33 for lubricant are formed on the left and right sides of the pin insertion hole 32, Accordingly, as shown in FIG. 10, through holes 36 are formed in the bottom surface of the slide core 30 to communicate with each storage section 33. In addition, each through hole 36 opened at the bottom surface of the slide core 30 has two long grooves parallel to the sliding direction of the slide core 30 so as to communicate with each through hole 36, as shown in FIG. The book has been formed.

By integrally forming the storage sections 33 as described above, these storage sections 33 can be arranged separately on the left and right sides of the pin insertion hole 32, so that each storage section 33 and the pin insertion hole 32 can be prevented from interfering with each other. Not only that, but also the direction of inclination of the pin insertion hole 32 can be freely selected. Also, the angular pin 11 is inserted into this pin insertion hole 32 and makes sliding contact, but if the part forming this pin insertion hole 32 is thin, there is a high possibility of damage.
By arranging each storage section 33 on the left and right sides of this pin insertion hole 32, the portion forming the pin insertion hole 32 does not become thin, so that the life of the slide core 30 can be extended. .

Furthermore, since each storage section 33 is independent, it is possible to adjust the lubrication state on the left and right sides of the slide core 30 separately, and also to easily make delicate positional adjustments of the slide core 30 itself. I can do it. That is, by screwing in the plug 35 screwed into the lubricant in one of the housing parts 33, the lubricant can be taken out through the through hole 36 opened in FIG. will be pushed toward the spine of the paper in Figure 8. As a result, the slide core 30 in the state shown in FIG. 8 can be moved to the back side of the paper, and the slide core 30
It is possible to make fine adjustments to the position of the .

Further, on the bottom surface of the slide core 30, grooves are formed which communicate with the respective through holes 36 opened therein. By this,
Since the lubricant in each port can be discharged over substantially the entire bottom of the slide core 30, the bottom of the slide core 30 can be better lubricated.

(Effect of the invention) As explained above, in the present invention, "by moving one mold 10 provided with the angular pin 11 relative to the other mold 10,
Slide core 30 engaged with angular pin 11
In an injection molding apparatus 100 configured to retract a lubricant such as grease from an injection molded product 40, a storage portion 33 filled with a lubricant such as grease is formed in the slide core 30, and at least one sliding surface of the slide core 30 is One through hole 3 that forms a guide channel 37 for the lubricant and communicates this guide channel 37 with the storage section 33.
Furthermore, the guide flow path 37 is formed as a single curve that detours around the entire one side of the slide core 30, and lubricant reservoirs 37a are provided at both ends of this curve.
It is characterized by the fact that each of them was formed in succession.
A slide core that can provide good lubrication between the slide core and the mold supporting it in an injection molding apparatus can be provided with a simple structure.

That is, according to this slide core 30, even if you do not always pay attention to the lubrication state for the other mold 20, the lubricant in the storage portion 33 always leaks to the sliding surface of the slide core 30 and lubricates the other mold 20. Therefore, maintenance of the slide core 30 itself is easy, and the slide core 30 can be easily maintained.
This allows for long-term maintenance-free operation. Therefore, the molded product 40 can be manufactured more efficiently using this type of injection molding apparatus 100 than with conventional apparatuses.

Further, according to the present invention, the guide channel 37 is formed as a single curve that detours around the entire one side surface of the slide core 30, and the lubricant reservoirs 37a are continuously formed at both ends of this curve. There is also a feature in its structure, whereby the guide channel 37 is formed on the surface side of the slide core 30, so the formation of the guide channel 37 is controlled by the guide block that guides the slide core 30. This is easier than forming it on the inner surface.

Since this guide channel 37 is formed as a single curve that detours around the entire one side surface of the slide core 30, it can be easily formed, for example, by continuously moving a groove carving machine.

Since this guide flow path 37 is formed as a single curve that detours around the entire one side of the slide core 30, the storage section 37 that stores the lubricant
Even if the guide channel 37 is communicated with the guide passage 37 through one through hole 36, the lubricant is sufficiently supplied to the guide passage 37, and the through hole 36 can be easily formed.

Lubricant reservoirs 37 are provided at both ends of this guide passage 37.
Since the lubricant reservoirs 37a are formed continuously, lubricant can be supplied satisfactorily by these lubricant reservoirs 37a.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an injection molding device using a slide core according to the present invention, Fig. 2 is a cross-sectional view of the injection molding device showing a state in which one mold and the other mold are open, and Fig. 3 4 is a sectional view taken along the line - in FIG. 3, FIG. 5 is a plan view of the slide core, and FIG. 6 is a bottom view of the same. 7 to 13 show a second embodiment of the slide core according to the present invention, FIG. 7 is a perspective view of the entire structure, FIG. 8 is a front view of the same, and FIG. 9 is a plan view of the same. 10 is a bottom view of the same, FIG. 11 is a left side view of the same, FIG. 12 is a right side view of the same, and FIG. 13 is a sectional view taken along the - line of FIG. 8. Explanation of symbols, 100... Injection molding device, 10...
...One mold, 11... Anguilla pin, 20...
...Other mold, 21...Guide pin, 22...Ejector pin, 30...Slide core, 31...
Guide, 32...pin insertion hole, 33...storage section,
34...Threaded part, 35...Plug, 36...Through hole, 37...Guiding channel, 37a...Lubricant reservoir, 3
8... Guide surface, 39... Undercut forming part,
40... Molded product, 41... Undercut portion.

Claims (1)

[Claims for Utility Model Registration] 1) A slide core engaged with the angular pin is retracted from the injection molded product by moving one mold having the angular pin relative to the other mold. In the injection molding apparatus, a storage portion for filling a lubricant such as grease is formed in the slide core, and a guide flow path for the lubricant is formed on at least one sliding surface of the slide core, and A through hole is provided that communicates the guide channel with the storage section, and the guide channel is formed as a curved line that detours around the entire one side surface of the slide core. A slide core characterized by continuously forming lubricant reservoirs at both ends. 2) The storage section is formed as a screw hole, and the storage section is closed by screwing a plug into the storage section. The slide core according to item 1.