JP2519967B2 - Molding die - Google Patents

Description

TECHNICAL FIELD The present invention relates to a molding die having a slide core.

(Prior Art) Conventionally, a molding die having a slide core between an upper mold and a lower mold has been used when molding a component having a complicated shape. In this molding die, as shown in FIG. 3, a spacer block 16 is placed on a movable side mounting plate 15 of a molding machine, and a receiving plate 17, a movable side mold plate 18, a slide core 19, a fixed side mold are placed thereon. Board
The runner plate 21 and the runner 20 are stacked, and the fixed-side mounting plate 22 is placed thereon. Then, finger pins are inserted between the spacer block 16 and the runner plate 21.
In order to mount the slide core 23 in an inclined manner, a through hole 29 is provided at a predetermined position of the slide core 19, and the finger pin 23 engages with the slide core 19 through the through hole 29. Then, an end face of the slide core 19 is provided with an inclined surface 24 that follows the inclination of the finger pin 23.
A backing plate 25 having a notched end surface that slides on 24 is provided.
On the upper surface side of the backing plate 25, there was provided a projecting portion 25a which is engaged with the groove portion 20a provided on the fixed-side template 20, so as to regulate the movement of the slide core 19. Further, a stopper pin 27 is attached to the inclined surface 24 of the slide core 19, and the stopper pin 27 is inserted into a holding metal fitting 26 provided on the movable side mold plate 18, and the holding metal fitting 26 and the stopper pin 27 are inserted. A spring 30 is provided between the end surface of the slide core 19 and
Had a structure to be pressed against the backing plate 25.

(Problems to be Solved by the Invention) A molding die configured as described above is attached to a molding machine, and each member of the laminated molding dies is pressed and fixed by a fastener of the molding machine, and a movable mold The plate 18 and the movable side mounting plate 15 were moved in the left-right direction, and the material was press-fitted and molded from the injection port of the sprue bush 28 provided in the upper part of the molding die.
At this time, the slide core 19 is moved to the injection pressure. The backing plate 25 was moved up and down to regulate the movement of the slide core 19. As described above, it is the shape and the mounting position of the backing plate 25 that determines the force of pressing the slide core 19 against the position of the slide core 19 and the molding pressure, but this is mechanically determined. It was very difficult to adjust. Actually, after molding the molded product, the position of the backing plate 25 had to be adjusted by the spacer as a result of trial and error by observing the condition of the burr generated on the molded product. For this reason, the mold had to be disassembled every time adjustment was made, which was very troublesome and significantly hindered the work efficiency.

Further, when molding a material having poor fluidity or forming a part having an extremely thin shape, a high molding pressure is required, so a force comparable to the molding pressure is applied when the slide core 19 is clamped. If not, the slide core 19 will move during molding and a large amount of burrs will be generated. Therefore,
In order to apply a force to the slide core 19 so as to withstand high pressure and molding pressure, if the position of the contact plate 25 and the spacer are thickened,
The slide core 19 and the fixed-side template due to the wedge effect of the backing plate 25
This caused a trouble of breaking the protruding portion 25a of the backing plate 25 provided on the 20.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a molding die that facilitates position adjustment of a slide core and prevents damage to the die.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a molding die including an upper die, a lower die, and a slide core, and an A link connecting the slide core and the link block. A toggle link that rotatably engages a rod from a runner plate and interlocks with upper and lower mold clamping is provided on a fulcrum with the B link, the slide core is operated by the toggle link, and a positioning device is provided on the slide core. Is provided to position the slide core in an adjustable manner.

(Operation) In the molding die according to the present invention, since the toggle link in which the rod from the runner plate is rotatably engaged is provided on the fulcrum of the A link and the B link that connect the slide core and the link block, The rod moves up and down according to the opening and closing of the mold to easily move the slide core back and forth, and the positioning device provided on the slide core allows the position of the slide core to be adjusted freely, preventing damage to the mold. It becomes possible to prevent it.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view of a molding die toggle link and a slide core positioning device, and FIG. 2 is a plan view of FIG.

The outline structure of the molding die according to the present invention is that a movable side mounting plate is provided in the lowermost layer, and a spacer block, a receiving plate, a movable side mold plate, a slide core, a fixed side mold plate, a runner plate, a fixed side mounting plate are provided on the movable block. The plate and the plate are sequentially laminated, and have the same structure as the conventional example. In this configuration, the toggle link provided on the slide core and the slide core positioning device will be described in detail below.

In FIGS. 1 and 2, reference numeral 1 is a slide core. An upper die of the molded product is formed in the central portion (left side of the drawing) of the slide core 1. On one side of the slide core 1, an A link 2 rotatably attached to a fulcrum 1a is provided. The A link 2 is composed of two bars, and the B link 4 is provided at the other end of the A link 2 via a support shaft 3. One of the B links 4 is formed into a fork, and the A link 2 is rotatably sandwiched by a support shaft 3 inside the fork. At the other end of the B link 4, there is a fulcrum 1b provided at the same distance as the fulcrum 1a of the A link 2 and the fulcrum shaft 3, and the fulcrum 1b is rotatably attached to the attachment portion 5a of the link block 5. Has been. Then, a part of the fixed-side template 20 laminated on the slide core 1 is penetrated inside the A-link 2 composed of two bars rotatably attached to the support shaft 3. Runner plate 6
The rod 7 rotatably attached to the link pin 6a provided on the A-link 2 supports the A-link 2 and the B-link 4 in a straight line.
The toggle link 8 is formed by the link 4.

A blind hole 5b is provided on the lower side of the center of the front side of the link block 5 which is the opposite side to which the mounting portion 5a of the link block 5 supporting one fulcrum 1b of the toggle link 8 is formed. A notch recess is provided around the blind hole 5b of the link block 5, and a mounting plate 9 for a link block operating screw is attached to the notch recess. This mounting plate 9 is provided with a through hole 9a smaller than the blind hole 5b in a position concentric with the blind hole 5b provided in the link block 5, and when the mounting plate 9 is mounted in the cutout recess of the link block 5, the through hole Hole 9a is a blind hole
It is formed to have a collar-shaped structure of 5b. A collar portion 10a provided at the bottom of the link block operating screw 10 is included in the collar-shaped structure. The link block operating screw 10 is provided with a male screw portion 10b from the upper part of the collar portion 10a, and a knob 10c provided with a knurl is attached to the uppermost end, and the link block operating screw 10 is rotated by turning the knob 10c. The mounting plate 9 can be rotated by being supported by the flange-shaped structure. This link block actuation screw 10
A tie bar connecting block 11 is engaged with the male screw portion 10b. The tie bar connecting block 11 is arranged on the front side of the link block 5, is horizontally aligned with the upper surface of the link block 5 on the upper side, and is a flat plate block extending to the lower side of the link block 5 on the lower side and a movable side on the lower side. It is screwed to two tie bars 12 and 12 fixed to the template of. At the center of the tie bar connecting block 11, there is provided a female screw portion which is screwed into the male screw portion 10b of the link block operating screw 10 engaged with the link block 5, and the link block operating screw 10 is rotated. As a result, the distance between the link block 5 and the tie bar connecting block 11 can be adjusted. In addition, the tie bar connecting block 11 and the link block operating screw 10
A rot nut 13 is screwed into a male screw portion 10b between the tie bar and c, and the tie bar connecting block 11 is locked by fastening the lock nut 13 to the tie bar connecting block 11 side. A positioning micro head 14 is attached above the link block operating screw 10 and on the tie bar connecting block 11. The tip f of the spindle 14a of the positioning micro head 14 penetrates the tie bar connecting block 11 and It is provided so as to be in contact with the mounting plate 9.

The operation of the molding die having the above structure will be described below. This molding die uses a toggle link 8 to operate the slide core 1. The rod 7 attached to the runner plate 6 moves up and down according to opening and closing of the die, and the spindle 3 attached to the rod 7 Via A-link 2 and B
The link 4 moves, but since the B link 4 side is attached to the link block 5 and thus the fixed position of the link block 5 is maintained, the slide core 1 on the A link 2 side
Only moved. After confirming this state, each of the stacked die members is clamped, and the die is closed with no load of molding pressure. In this state, the rod 7 descends and A
The link 2 and the B link 4 are arranged on a straight line. Next, the link block operating screw 10 is rotated to push the link block 5 toward the slide core 1, and the positioning micro head 14 is rotated while the link block operating screw 10 is stationary. Read the scale when 5 is brought into contact with the mounting plate 9. Next, assuming the molding pressure applied to the slide core 1, the link block 5 is advanced so that the slide core 1 can generate a force that withstands the molding pressure. In the structure of the present invention, the forming pressure is finally received by the tie bars 12 and 12. Therefore, if the diameter of the tie bars 12 and 12 is determined, the relationship between the advance amount of the link block 5 and the forming pressure can be quantitatively grasped. After that, based on the above quantitative relationship, the link block 5 is advanced with the link block operating screw 10 in the mold closed state, and the advance amount is precisely set by the positioning micro head 14.
If the link block 5 is moved so as to align with the tip of the spindle 14a of the positioning micro head 14, the position of the link block 5 can be precisely positioned.

Finally, the lock nut 13 may be fixed to the male screw portion 10b of the link block actuating screw 10 by screwing.

(Effects of the Invention) As described in detail above, the slide core is provided with a toggle link that interlocks with upper and lower mold clamping, the slide core is operated by the toggle link, and a positioning device is provided on the slide core. Since the slide core is positioned so that it can be adjusted freely, the link block can be finely adjusted without disassembling the mold, and the molding pressure can be quantitatively grasped and adjusted. There is an advantage that the damage of the mold can be completely prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view of a toggle link of a molding die and a slide core positioning device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. It is a side sectional view of an example mold. 1 ... Slide core, 5 ... Link block, 8 ... Toggle link, 10 ... Link block operating screw, 11 ... Tie bar connecting block, 14 ... Positioning micro head.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B29C 45/80 7365-4F B29C 45/80 (72) Inventor Masashi Kobayakawa 1048 Kadoma, Kadoma, Osaka Prefecture Matsushita (56) References JP-A-60-248329 (JP, A) JP-A-62-137165 (JP, A)

Claims (1)

(57) [Claims] 1. A molding die comprising an upper die, a lower die and a slide core, wherein a rod from a runner plate is rotatable on a fulcrum of an A link and a B link connecting the slide core and a link block. A toggle link that engages with the upper and lower molds and is interlocked with the upper and lower mold clamps, the slide core is operated by the toggle link, and a positioning device is provided on the slide core to position the slide core in an adjustable manner. Molding die.