JPH0338313A - Alignment structure of mold for resin molding - Google Patents

Abstract

PURPOSE:To carry out alignment of a mold with high accuracy by processing a tapered section and a product section on a fixed type template and a movable template respectively on the same line, inserting loosely an insert block on one template of either the movable template or the fixed type template crossing the mold closing direction and aligning the insert block by means of engagement of the tapered section at the time of mold closing. CONSTITUTION:A fixed side insert block 8 is installed in an installing opening 4 of a fixed template 2, and a male screw hole 12 is fixed from the rear side of the fixed template 2 by a bolt 14. At that time, reference lines X1, X2 and Y1, Y2 are conformed with, and the fixed template 2 is fixed to a fixed side mounting plate 51. A movable side insert block 9 is inserted loosely into an installation opening 5 of the movable side template 3, and a male screw hole 17 is fixed tentatively and loosely by a bolt 19 from the surface side of the movable template 3. When mold closing is carried out, guide pins 15, 15 of the movable side insert block 9 are engaged with guide holes 10, 10 of the fixed side insert block 8, and tapered pins 16, 16 are engaged into tapered pin holes 1, 1. The movable side insert block 9 is moved slightly in the crossing direction following the guiding by pin engagement and the movable side insert block 9 is aligned to correspond to the fixed side, and mold opening is carried out and a bolt 19 of the movable side insert block 9 is tightened to fix the position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a mold for injection molding, and more particularly to a mutual centering structure of the molds.

[Prior art 1] When using a nesting type mold for this type of resin molding,
As shown in FIG. 4(A), female screw holes 32 to 35 for fixing are provided at the four corners of the nesting mold 30, and a cavity side product portion 36 is provided approximately in the center. During machining, the female screw holes 32 to 35 on the upper right are positioned using reference lines xi and y2, respectively.

Each hole is machined. Product part 36 has 4 female screw holes 32~
Positioning is performed using reference lines x2 and y2 that are different from ``35,'' and cutting is performed based on this positioning.

In addition, the mounting holes 39 in the fixed mold plate 38 are set as standards aX3, y3.
The hole 46 for the taper pin and the guide hole 4 are
7 is the standard @x4. Positioning processing is performed at y4.

The nesting die 30 is fitted into the mounting hole 39 of the fixed die plate 38, for example, and the female screw holes 32 to 35 are fitted with bolts 40 from the back side.
It has a structure in which it is screwed into a fixed body. Although not detailed,
The nesting mold 31 having the core side product part 37 is similarly fixed to the mounting hole 42 of the movable template 41. In the figure, 43 and 44 are female screw holes of the insert 5 and 31, 45 are bolts, and 46 are fixing holes. 47 is a guide hole in the fixed template 38; 48 is a taper bin in the movable template 41; 49 is the movable template 4.
1 is a guide pin, and 50 is a hole for a tie bar.

[Problems to be Solved by the Invention] When centering, it is assumed that the taper pin 48 and the guide pin 49 are aligned, and the zero is removed at least four times in total, two times on the fixed side and two times on the movable side. Accuracy was determined using standards.

However, as shown in FIG.
However, since the female screw holes 32 to 35 and the product part 36 are individually positioned and machined, mutual machining errors can be avoided. Not only is this unavoidable, but there are manufacturing tolerances between them. Therefore, the reference line xi,
It is difficult to determine based on yl or x2, y2.

Also, the accuracy with the fixed side mounting plate 51 must be determined based on the fixed mold plate 38. Even in this case, even if the reference lines x4 and y4 of the taper pin holes 46 are accurate, different mounting holes may be used. The reference lines x3 and y3 of No. 39 do not match.

Correspondingly, the position of fixing the nesting mold 31 in the mounting hole 42 of the movable mold plate 41 must be precisely determined.
However, as mentioned above, the female threaded holes 43 and 44 and the core side product! 37 and the Mm tolerance are unavoidable, and furthermore, the fixed positions of the movable mold plate 41 and the IIT movable side movable mounting plate 52 must be accurately determined after that.

Furthermore, if the clearance between the tie/-mm hole 50 and the tie bar 53 is taken into consideration, it becomes difficult to achieve high-precision centering of the mold. No matter how high precision the mold is,
Precision molding 1 would not have been possible without centering accuracy.

Therefore, the present invention was provided in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to enable highly accurate centering of a mold.

[Means for Solving the Problems] A mold for resin molding according to the present invention for achieving the above-mentioned object has the following features: a fixed mold plate and a movable mold plate are machined with a taper part and a product part on the same line, respectively; The nesting mold is loosely inserted into the movable mold plate and the fixed mold plate, which have at least one force, intersecting the mold closing direction, and the nesting mold is centered by the engagement of the tapered part when closing the mold. It is characterized by a configuration that

[Function] Unlike the fixed mold plate and the moving mold plate, the taper part and the product part are machined along the same line E, so there is no need for precision between the taper part and the product part. Since the nesting die is loosely inserted into at least one template, the nesting die is slightly moved to match the other template by engagement of the tapered portion when the mold is closed. The nested mold will be aligned by slightly moving in the cross direction of the mold closing, so it can be fixed after that.

[Embodiment] An embodiment of the present invention shown in FIGS. 1 and 3 will be described below.

As shown in FIG. 3, the resin molding mold l includes a fixed mold plate 2 and a movable mold plate 3, and mounting holes 4 and 5 are bored in both mold plates 2.3 from the parting surface side. , a nesting mold 8.9 in which a product part 6.7 is designed can be mounted in the mounting hole 4.5.

As shown in FIG. 1(A), the stationary side nesting mold 8 has guide holes 10 and 10 as tapered parts, and tapered taper pin holes 11 and 11 as tapered parts.
The cavity side product part 6 is the same reference line XI,
For example, the guide holes 10 and 10 and the taper pin holes 11 are positioned on the same tape or disk of the NG processing machine and are processed in the same way.
11 and the cavity side product part 6 are positioned within the range of manufacturing tolerances. Further, the female screw hole 12 is formed from the back side of the nesting die 8.

Moreover, as shown in FIG. 1(B), the fixed mold plate 2 is eAB
Hole 4 and port insertion hole 13... are on the same reference line X2. Y2
Processed based on.

On the other hand, as shown in FIG. 2(A), the movable nesting die 9 includes a guide pin 15.15 as a tapered portion, a tapered taper pin 16 as a tapered portion, and a port insertion hole 18. ... and the core side product □7 are on the same reference line X3. Processed based on Y3, both 15, 18, 1
8.7 is positioned within machine precision. The bolt insertion hole 18 is formed to have a slightly larger diameter than the diameter of the port 19, for example, 1 mm or less, preferably 0.11 mm.
The gap below is made.

Moreover, as shown in FIG. 2(B), the movable template 3 is
Mounting hole 5 and female threaded hole 17... are the same 1 & directrix X4. Y4
Processed based on. The mounting hole 5 above is the movable side nesting type 9
The clearance is large enough to allow slight movement, for example, 1 mm or less, preferably 0.1 mm.

To install the above-mentioned mold, as shown in FIG. (Pol) Fix with 14. At this time, positioning is achieved by aligning the reference lines XI, X2 with Yl, Y2. Thereafter, the fixed mold plate 2 is fixed to the fixed side mounting plate 51.

Next, loosely insert the movable nesting die 9 into the mounting hole 5 of the movable template 3, and insert the female screw hole 17 from the front side of the movable template 3 into the port 1.
Loosely temporarily fix it with 9. Due to the temporary fixation, the movable nested mold 9 is fixed so that it cannot be pulled out in the mold opening/closing direction, but it is mounted so that it can be slightly moved left and right or upward in the direction crossing this direction.

Roughly speaking, when moving to the mold closing process, the id pins 15 and 15 of the movable insert mold 9 are connected to the guide holes 10 and 1 of the fixed insert mold 8.
At the same time, the taper pins 16 and 16 are inserted into the taper pin hole 11. In this case, since the fixed side is fixed and the movable side is in a free state, the movable nested die 9 will inevitably be slightly moved in the above-mentioned intersecting direction as guided by the pin engagement. As a result, the movable nested mold 9 is aligned so as to match the stationary side, so the 6f movable nested mold 9 is placed in the open state.
(pol) 19 to fix the position.

As explained above, according to the above embodiment, alignment is performed by moving the movable side to match the fixed side. At least, alignment can be achieved with an accuracy of approximately 0.02 mm, which is the clearance between the taper pin 16 and the taper pin hole 11, and troublesome centering work can be eliminated. In this case, equivalent alignment can be achieved even if the fixed side does not have a nested structure.

In the above embodiment, the case where the movable side nesting mold 9 is slightly moved is illustrated, but the zero double nesting mold 8.9, which has the same effect even if replaced with the fixed side nesting mold 8, is freely moved. It is also possible to align the center by inserting it and moving it slightly. In this case,
The design can be changed to a structure in which the mold plate 2.3 fixes the mold plate 2.3 from the parting surface side of the nested molds 8 and 9, and a bolt insertion hole 18 with a clearance is provided in the nested mold 8.9. Furthermore, the structure of the tapered portion of the nested mold 8.9 can be implemented in various ways. Based on the same technical idea, it is also possible to implement a mold structure in which a U-shaped groove is formed from the upper part of both mold plates along the parting surface, and a nesting mold is attached from the upper part.

[Effects of the Invention] As explained above, according to the nested resin molding mold according to the present invention, centering can be achieved by moving one nesting die in the cross direction of mold opening by engaging the tapered portion. This made it possible to easily achieve high-precision alignment.

[Brief explanation of drawings]

Drawings 1 to 3 show an example of the centering structure of a resin molding die according to the present invention, fiSf diagram (A) is a front view showing the stationary side nested mold, and fiSf diagram (B) is a front view showing the fixed side nested mold. FIG. 2 (A) is a front view showing the movable nested mold; FIG. 2 (B) is a pressure surface view showing the mounting on the movable mold plate;
The figure is an explanatory diagram of the mold in an assembled state, and FIGS. 4(A), (B), and 5 are a front view and an explanatory diagram showing the conventional mold. 1...Mold for resin molding, 2...Fixed mold plate, 3...
...Movable template, 4,5...28 holes, 6.7...
...Product Department, 8.9...Nested type, to, 11,14
．． 15...Tapered part, 18...Port insertion hole.

Claims (1)

[Claims] The taper part and the product part are machined on the same line on the fixed mold plate and the movable mold plate, respectively, and the nesting mold crosses the mold closing direction on at least one of the movable mold plate and the fixed mold plate. A centering structure for a mold for resin molding, characterized in that a nested mold is loosely inserted and aligned by engagement of a tapered part when closing the mold.