KR20190087124A - Mold device for manufacturing pallet - Google Patents

Abstract

The present invention relates to a mold for manufacturing a pallet. The mold of the present invention includes: an upper plate having an upper core fixed to a bottom portion and coupled to an upper fastening plate; and a lower plate having a lower core fixed to a top portion and coupled to a lower fastening plate, wherein a slide core is coupled between the upper core and the lower core such that the slide core can be slid to the lower plate, an insert core is installed on the top portion of the lower plate, an eject pin connected to a liftable eject plate is provided within the lower plate and the lower fastening plate, and the insert core is fixed to an upper end of the eject pin. According to the foregoing configuration of the mold, the mold has effects of enabling mold manufacturing costs to be reduced and enabling productivity to be improved since a separate means for pressurizing the insert core toward the slide core is unnecessary by connecting the insert core to the eject pin in order to prevent retreat of the insert core.

Description

[0001] The present invention relates to a mold for manufacturing pallet,

The present invention relates to a mold for manufacturing a pallet, which requires no separate means for pressing the insert core toward the slide core, thereby reducing the manufacturing cost of the mold and improving the productivity by simplifying the mold.

Generally, the hand-car type pallet is formed in a unidirectional rib structure in which a part of the upper surface portion of the rectangular main body is formed as a longitudinal rib or a unidirectional rib of the transverse rib, and this palette is not uniform in overall mechanical strength, And it shortens the service life.

In order to manufacture a pallet for solving such a problem, a 'Hand-car type pallet and its mold apparatus' is disclosed in Korean Utility Model No. 20-311601.

However, the mold disclosed in the above publication has a fatal defect in which the hydraulic cylinder of the insert core is pushed by the injection pressure at the time of injection. That is, since the working fluid of the hydraulic cylinder can not be completely made into the incompressible liquid, the retraction action of the hydraulic cylinder by the injection pressure occurs at a certain degree of compression ratio. As a result, the molten resin leaks to make the dense composition difficult, thereby deteriorating the reliability of the strength. The leakage of the resin causes the increase of the raw material, as well as the resin being stretched in the mold, making it difficult to move the cylinder backward. There is a problem that stops the operation. In addition, there is a disadvantage that the time and load for cleaning the resin when the resin is attached to the apparatus, as well as the moving movement of the cylinder are not accurately performed.

In order to solve this problem, Korean Utility Model No. 10-0436695 discloses a 'mold for manufacturing a hand-car type pallet'.

According to the publication, an inner slider is connected to slide on a side surface of a slide connector to which a first hydraulic cylinder is connected, a first hydraulic cylinder is assembled by a fastening plate, The locking bar is provided integrally and connected to a second hydraulic cylinder for transferring the slide core. The locking bar is installed so that the first hydraulic cylinder connected to the clamping plate moves down from the bottom of the first hydraulic cylinder when the first hydraulic cylinder is lifted.

However, since the mold according to the above publication requires separate means such as a first hydraulic cylinder and a locking bar in order to bring the inner slider of the insert core into close contact with the slide core, the manufacturing cost of the mold increases, There is a problem.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems, and it is an object of the present invention to prevent the recession of the insert core due to the injection pressure during injection, thereby preventing leakage of the molten resin due to the gap of the insert core, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a mold for manufacturing a pallet which can reduce the manufacturing cost of the mold and improve the productivity by eliminating the need for a separate means for pressing the insert core toward the slide core.

The present invention relates to an upper plate having an upper core fixed to a lower portion and coupled to an upper clamping plate; And a lower plate fixed to an upper portion of the lower core and coupled to the lower clamping plate, wherein a slide core is slidably coupled to the lower plate between the upper core and the lower core, And an insert core is installed in the lower plate and the ejection pin is connected to a liftable eject plate in the lower plate and the insert core is fixed to an upper end of the eject pin.

According to the present invention, the pair of eject pins may be arranged to be spaced apart from each other, and a pair of the eject pins may be inclined so that a gap between the pair of eject pins may become narrower from the bottom to the top, As the plate moves upward, a pair of insert cores fixed to a pair of the eject pins forming the set are moved upward, and at the same time, the intervals between the insert cores are narrowed.

According to the mold for manufacturing a pallet of the present invention, the following effects can be obtained.

It is possible to prevent the molten resin from leaking due to the clearance of the insert core by preventing the retreat of the insert core due to the injection pressure at the time of injection.

By connecting the insert core to the ejection pin in order to prevent retraction of the insert core, there is no need for a separate means for pressing the insert core toward the slide core, thereby reducing the cost of manufacturing the mold, Can be improved.

1 is a perspective view showing a layout of a slide core of a mold for manufacturing a pallet according to a preferred embodiment of the present invention.
FIG. 2 is a sectional view of a mold for manufacturing a pallet taken along the line A-A 'in FIG. 1; FIG.
Fig. 3 is an enlarged view of a portion B in Fig. 2; Fig.
Fig. 4 is an operational view of a mold for manufacturing a pallet after the product is molded. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

A mold for manufacturing a pallet according to a preferred embodiment of the present invention includes a top plate 100 and a bottom plate 500, as shown in FIG.

The upper plate 100 is coupled to an upper clamping plate 200 fastened to an injection machine and an upper core 110 for upper molding of the product 10 is fixed to a lower portion of the upper plate 100.

The upper clamping plate 200 and the upper plate 100 are provided with molten resin supply means including a sprue, a runner, a gate, and the like for supplying the molten resin.

The lower plate 500 is coupled to a lower clamping plate 600 fastened to an injection machine and a lower core 510 for lower molding the product 10 is fixed to the upper portion of the lower plate 500.

A plurality of slide cores 310, 330, 350, 370, 320, 340, 360, 380 are provided between the upper core 110 and the lower core 510 to slide on the lower plate 500, Respectively.

A pair of slide cores 310 and 320, 330 and 340, 350 and 360, 370 and 380 arranged to face each other and a plurality of sets are provided on the upper side of the lower plate 500.

The pair of slide cores 310, 320, 330 and 340, 350 and 360, 370 and 380 constituting each set are spaced apart from each other, and the relatively long elongated slide cores 310, 330, 350, 370 and short slide cores 320, 340, 360, 380 having a relatively short length.

In addition, a longitudinal slide core 370 of another set 370 and 380 is disposed between a pair of slide cores (for example, 310 and 320) constituting one set.

1, a total of four sets (310, 320, 330 and 340, 350 and 360, 370 and 380) of the slide core according to the present embodiment are arranged in a lattice form.

The structure in which the slide cores 310, 330, 350, 370, 320, 340, 360, and 380 are slidable is as follows. A slide block is connected to a lower portion of each of the slide cores 310, 330, 350, 370, 320, 340, 360 and 380. A hydraulic cylinder is connected to the slide block, The slide core is slidable in one direction from the lower plate, and is not shown in the drawings in the drawings for convenience.

As shown in Fig. 2, a large number of insert cores 700 capable of forming the lower opening of the pallet are provided on the upper portion of the lower plate 500.

Particularly, edge portions 701a and 701b protruding outward are formed on the upper ends of the insert cores 700a and 700b, respectively. The edge portions 701a and 701b form edge portions 701a and 701b, It is possible to form the slope surface of the handkerchief slope, that is, the slope of the bottom opening of the pallet.

The insert core 700 is preferably fixed to the upper end of the eject pin 810, which is provided for pushing the product 10 in the mold after injection molding.

The eject pin 810 is connected to an eject plate 800 that is movable up and down in the lower plate 500 and the lower fastening plate 600. That is, the lower end of the eject pin 810 is hingably connected to the eject plate 800. In this embodiment, the eject plate 800 is composed of two plates arranged up and down, and the lower end of the eject pin 810 may be fixed to either the upper eject plate or the lower eject plate.

In addition, the present embodiment ejection pins 810 are configured so as to form a pair of pairs 810a and 810b, which are spaced apart from each other. That is, a pair of eject pins 810a and 810b constitute one set, and a plurality of sets are disposed in the lower plate 500 and the lower fastening plate 600.

The lower ends of the eject pins 810a and 810b are connected to the eject plate 800 and the upper sides of the eject pins 810a and 810b pass through the lower plate 500. [ The ejection pin through hole 501 is formed in the lower plate 500. The ejection pin through hole 501 is formed in the lower plate 500 as the ejection pins 810a and 810b are inclined, As shown in Fig. Insert cores 700a and 700b are fixed to the upper ends of the eject pins 810a and 810b exposed to the upper side of the lower plate 500 through the eject pin through holes 501. [

The pair of eject pins 810a and 810b constituting each set are arranged to be inclined so that the interval between the ejection pins 810a and 810b becomes narrower from the lower part to the upper part.

4, the pair of insert cores 700a, 700b fixed to the pair of eject pins 810a, 810b forming the set as the eject plate 800 moves upward, 700b move to the upper part and the interval between them becomes narrower.

The operation of the pallet manufacturing mold according to the present invention will now be described.

As shown in FIG. 2, the upper plate 100 and the lower plate 500 of the mold are coupled to form a pallet.

At this time, the ejection plate 800 is moved downward and the insert cores 700a and 700b fixed to the upper ends of the eject pins 810a and 810b come in contact with the slide cores 310, 320 and 370, The bottom openings of the pallets can be formed by the cores 700a and 700b and the edge portions 701a and 701b of the insert cores 700a and 700b form sloped surfaces of the handkerchief slopes of the pallets, Can be formed.

In this state, resin is injected through the gate.

When the resin is injected at a constant pressure and the shape of the pallet 10 is formed by the upper core 110 and the lower core 510, as shown in FIG. 4, the upper clamping plate 200 moves upward , The upper plate 100 is separated from the molded product 10.

Then, the slide cores 310, 320, and 370 are slid to the outside of the mold. That is, the pair of slide cores 310 and 320 constituting one set are slid in the direction away from each other.

Then, when the ejection plate 800 is pushed up from the ejector, the ejection plate 800 moves upward. As a result, the pair of insert cores 700a and 700b fixed to the pair of eject pins 810a and 810b constituting one set move upward, and at the same time, the interval between the insert cores becomes narrower.

The insert cores 700a and 700b fixed to the eject pins 810a and 810b push the molded product 10 upward from the lower plate 500 so that the product 10 is completely separated from the mold.

According to the mold for manufacturing a pallet of the present invention, the following effects can be obtained.

It is possible to prevent the molten resin from leaking due to the gaps between the insert cores 700a and 700b by preventing the insert cores 700a and 700b from retracting due to the injection pressure at the time of injection.

In order to prevent retraction of the insert cores 700a and 700b, the insert cores 700a and 700b are connected to the ejection pins 810a and 810b by inserting the insert cores 700a and 700b into the slide cores 310 and 330, 350, 370, 320, 340, 360, 380) is unnecessary, so that it is possible to reduce the manufacturing cost of the mold and improve the productivity.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100: top plate
110: phase core
200: upper fastening plate
310, 330, 350, 370: Slide core
320, 340, 360, 380: Short slide core
500: lower plate
510: Lower core
600: Lower fastening plate
700a, 700b: insert core
800: Eject plate
810a and 810b:

Claims (2)

An upper plate fixed to the upper core at a lower portion thereof and coupled to the upper clamping plate;
And a lower plate fixed to the lower core at an upper portion thereof and coupled to the lower clamping plate,
A slide core is slidably coupled to the lower plate between the upper core and the lower core,
An insert core is provided at an upper portion of the lower plate,
An eject pin is provided in the lower plate and the lower fastening plate, the eject pin being connected to an elevatable eject plate,
Wherein the insert core is fixed to an upper end of the eject pin. The method according to claim 1,
Wherein the eject pins are formed as a set of pairs spaced apart from each other,
A pair of the eject pins constituting the set are arranged so as to be inclined so that the distance between them becomes narrower from the lower part to the upper part,
Wherein as the eject plate moves upward, a pair of insert cores fixed to a pair of the eject pins forming the set moves upward, and at the same time, a gap between the insert cores becomes narrower.

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