KR100352248B1 - Metal mold - Google Patents

Abstract

Disclosed is a mold having a stationary die and a movable die for forming a predetermined cavity, and a sealing plate for separating a molded article cured in the cavity. The present invention, the guide member for guiding the transfer of the movable die to the fixed die; And position holding means for stepwise positioning at least half the movement of the movable die with respect to the fixed die until the molded article in the cavity is separated by the contact plate portion; The position holding means is disposed between the guide member and the cavity, the primary centering pin to maintain the position of the transfer movement of the movable die to a predetermined first access half position of the movable die with respect to the fixed die ; And a secondary centering pin disposed adjacent to the cavity to maintain the position of the transfer of the movable die relative to the fixed die in a section within the predetermined primary access half position. Thereby, a defective molded article can reduce a generation rate.

Description

Mold {Metal mold}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold, and more particularly, to a mold in which the access of the movable die to the stationary die guides step by step, thereby minimizing the defects of components formed in the cavity.

The injection molding mold performs an important function of determining the efficiency of the injection molding and the quality of the molded article. Particularly, in order to satisfy the shape, dimensions, accuracy, and strength required by the molded article, the injection molding die has a high moldability and durability. Design and manufacture.

Among such molds, for example, molds that require high precision, such as injection molding of objective lenses for optical pickup, differ from the general molds according to the position and angle of the cores installed in the fixed die and the movable die. Quality depends 1 and 2 illustrate an example of a mold for performing such high precision injection molding.

As can be seen from the figure, the mold 1 has a fixed die and a movable die which are disposed opposite to the fixed die. In the following description, the lower die is referred to as the fixed die 11 and the upper die is referred to as the movable die 3 in the drawings. The movable die 3 is in close proximity to the stationary die 11.

The stationary die 11 is formed with a stationary molding groove 13 for forming a cavity, and the guide member 15 is provided at a predetermined interval outside the stationary molding groove 13. The guide member 15 serves to guide the access of the movable die 3 to the fixed die 11. A tapered pin 17 protruding upwardly is provided inside the guide member 15, that is, between the guide member 15 and the fixed molding groove 13. The stationary die 11 also has a sealing plate portion 19 for separating the molded article formed in the stationary molding groove 13.

On the other hand, the movable die (3) has a guide groove (7) for receiving the movable forming groove (5) and the guide member (15) forming a cavity together with the fixed forming groove (13) when approaching the fixed die (11). Have Then, a positioning groove 9 for setting the position of the tapered pin 17 is formed between the movable forming groove 5 and the guide forming groove 7.

With this configuration, the conventional die 1 is guided by the guide member 15 when the movable die 3 approaches the stationary die 11. Then, when the movable die 3 is moved and guided by the guide member 15 to a predetermined position, the tapered pin 17 of the fixed die 11 moves to the positioning groove 9 of the movable die 3. Position is fixed.

By the way, in the conventional mold 1, the taper pin 17 is positioned by the slight movement of the movable die 3 at the time of the transfer of the movable die 3 with respect to the fixed die 11 by the structure. Easily released into the groove (9). Thereafter, the transfer of the movable die 3 is guided only by the guide member 15. At this time, the guide member 15 is difficult to maintain the parallel movement of the movable die 3 in parallel, thereby (1) Deformation may occur in the overall shape. In particular, as time goes by, this phenomenon may be gradually intensified. At this time, the molded article cured in the cavity is subjected to an external force before it is released from the cavity, so that deformation occurs.

As such, in the mold 1 for injection molding electronic products requiring high precision, it is absolutely necessary to minimize the flow decrease in the cavity. In the conventional mold, the movable die 3 with respect to the fixed die 11 is required. As the force for guiding the approach of sine is weak, the shape deformation of the cavity occurs, whereby the defective rate of the molded article gradually increases with time.

Accordingly, it is an object of the present invention, in view of this problem in the prior art, that the access of the movable die to the stationary die can position the transfer movement until the molded article cured in the cavity is released, so that a defective molded article is generated. It is to provide a mold to be prevented.

Another object of the present invention is to provide a mold having a reduced number of parts and an increased durability.

Still another object of the present invention is to provide a mold capable of minimizing deformation of the molded article by maintaining the balance of the compact plate portion for taking out the molded article cured in the cavity.

1 is a front view of a conventional mold,

2 is an operating state of FIG.

3 is a front view of a mold according to the present invention,

4 and 5 is an operating state diagram of FIG.

Explanation of symbols on the main parts of the drawings

3: movable die 5: molding groove

11: fixed die 13: molding groove

15: guide member 17: guide groove

19: plate part 33: support plate

37: base 39: core

41: primary centering pin 43: primary centering home

45: secondary center ring pin 47: secondary center ring groove

The object of the present invention is to provide a guide member for guiding the transfer of the movable die to the fixed die in a mold having a fixed die and a movable die for forming a predetermined cavity, and a sealing plate for separating a molded article cured in the cavity. ; And position holding means for stepwise positioning at least half the movement of the movable die with respect to the fixed die until the molded article in the cavity is separated by the contact plate portion.

Here, the position holding means is disposed between the guide member and the cavity, the primary to maintain the position of the transfer movement of the movable die to a predetermined first approach half position of the movable die with respect to the fixed die Centering pins; And a secondary center ring pin disposed adjacent to the cavity to maintain the position of the transfer movement of the movable die with respect to the fixed die in a section within the predetermined first access half position. .

At this time, the primary and the secondary centering pin is installed in the fixed die; The movable die is preferably provided with a primary centering groove and a secondary centering groove for sliding the primary and secondary centering pins.

More preferably, the secondary centering pin can be configured to guide the movement of the plate portion.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3 is a front view of a mold according to the present invention. As described with reference to Figs. 1 and 2 of the related art, the die 31 is disposed opposite to the fixed die 11 and the fixed die 11, and the movable die with which the fixed die 11 approaches and closes. Has (3). Therefore, the detailed description is omitted, and the same reference numerals are used for the same configurations and names as above.

The fixed die 11 is composed of a base 37, a support plate 33, and a spacer block 35 interposed between the base 37 and the support plate 33, the core 39 in the central region of the support plate 33 ) Is installed. The core 39 is provided with a predetermined fixed forming groove 13 for forming a cavity. The spacer block 35 is provided with a tight plate portion 19 for taking out a molded product that is hardened in the cavity while approaching the core 39 in the orthogonal direction. The plate part 19 includes a plate body 53 fixedly coupled to the base 11, and a plurality of plate pins 51 provided on the plate plate 53 so as to be lifted and lowered.

On the outside of the support plate 33, a guide member 15 fixed to the spacer block 35 at a predetermined interval from the stationary molding groove 13 is provided. The primary centering pin 41 protrudes between the guide member 15 and the fixed molding groove 13 adjacent to the core 39. The primary centering pin 41 protrudes low from the support plate 33 with respect to the guide member 15. As a result, when the movable die 3 approaches, the movable die 3 is brought into contact with the movable die 3 at a position lower than the guide member 15, while the movable die 3 is moved at a position lower than the guide member 15 of the movable die 3. Separate from the die (3).

The support plate 33 is further provided with a secondary centering pin 45 disposed opposite the primary centering pin 41 with the fixed molding groove 13 interposed therebetween and adjacent to the contact plate portion 19. The secondary centering pin 45 protrudes low from the support plate 33 with respect to the primary centering pin 41. This makes contact with the movable die 3 at a position lower than the primary center ring pin 41 when the movable die 3 approaches, while being lower than the half center primary pin 41 of the movable die 3. Separate from the movable die 3 in position. The secondary centering pin 45 is connected to the platen pin 51 through a predetermined coupling means, whereby the lifting and lowering of the platen pin 51 is guided.

On the other hand, also in the movable die 3, the movable molding groove 5 which forms a cavity integrally with the fixed molding groove 13 of the fixed die 11 is formed. And, the outer side of the movable forming groove 5 is formed with a guide groove 7 for receiving the guide member 15. The guide groove 7 accommodates and holds the guide member 15 even when the movable die 3 is fully approached or separated from the fixed die 11. The movable die 3 is further provided with a primary centering groove 43 for receiving the primary centering pin 41 between the guide groove 7 and the movable forming groove 5. The secondary centering groove 47 is formed to face the secondary centering pin 45 of the fixed die 11.

4 and 5 are operating state diagrams of FIG. 3. As can be seen from these figures, the movable die 3 is separated from the fixed die 11 by the guide of the guide member 15. At this time, the movable die 3, which is half-moved, has a primary centering pin 41 and a secondary centering pin 45 which are provided radially around the molding grooves 5 and 13 as well as the guide member 15. The movement is guided to a predetermined position. At this time, the plate pin 51 of the plate part 19 rises, and the hardened | cured molded article in the shaping | molding grooves 5 and 13 is taken out. The rise of the contact pin 51 is guided by the secondary centering pin 45.

On the other hand, when the molded article is almost taken out from the molding grooves 5 and 13, the secondary centering pin 45 is taken out from the secondary centering groove 47. 4 illustrates a state in which the secondary centering pin 45 is drawn out from the secondary centering groove 47. After that, the movable die 3 is guided by its guide member 15 and primary centering pin 41. Then, after the primary centering pin 41 is also separated from the primary centering groove 43 in the predetermined primary access position, as shown in FIG. 5, the guide member 15 is moved up to the maximum position. Guided by the guide groove (7).

As described above, according to the present invention, there is provided a mold in which the access of the movable die to the stationary die can position the transfer movement until the molded article cured in the cavity is released, thereby preventing the occurrence of a defective molded article. In addition, the relatively complicated configuration for guiding the movement of the conventional tapered pin and the plate part is eliminated, while the number of parts is reduced, the distortion of the entire mold, etc. can be eliminated, and the durability can be increased.

On the other hand, the movement of the plate part for taking out the molded article cured in the cavity can be guided by the secondary centering pin, so that the balance can be maintained, whereby the deformation of the molded article can be minimized.

Claims (4)

A mold having a fixed die and a movable die for forming a predetermined cavity, and a sealing plate portion for separating a molded article cured in the cavity, A guide member for guiding the transfer of the movable die to the fixed die; And And position-holding means for stepwise positioning the movement of the movable die with respect to the fixed die until the molded article in the cavity is separated by the mill plate portion; The position holding means is disposed between the guide member and the cavity, the primary centering pin to maintain the position of the transfer movement of the movable die to a predetermined first access half position of the movable die with respect to the fixed die ; And And a secondary centering pin disposed adjacent to the cavity to maintain the position of the half movement of the movable die relative to the fixed die in a section within the predetermined first access half position. delete The method of claim 1, The primary and secondary centering pins are installed in the fixing die; The movable die is provided with a primary centering groove and a secondary centering groove for sliding the primary and secondary centering pins. The method according to claim 1 or 3, The secondary centering pin is a metal mold, characterized in that for guiding the movement of the mill.