JP2021098353A - Molding method of composite resin molding - Google Patents

Abstract

To provide a molding die arranged with a slide mold on a fixed side, which solves a problem that a flow channel of a secondary molding resin material is necessary on a movable mold side depending on a shape of a composite molding.SOLUTION: A cavity 19 for primary molding is formed of a fixed mold 1 on a fixed side, a fixed side primary molding part 4 of the fixed mold 1, and a split mold unit 11 of two parts of first and second molding parts 8 of a slide mold 2 on a movable side, and a cavity 20 for secondary molding is formed of a fixed mold 1, a fixed side secondary molding part 5 of the fixed mold 1, and a primary molding W1 set to a split mold unit 11 of a slide mold 2, thereby the cavity 20 for secondary molding is formed on the side of the fixed mold 1 with respect to the primary molding W1, and can inject a secondary molding resin material into the cavity 20 for secondary molding from the fixed mold 1.SELECTED DRAWING: Figure 15

Description

INDUSTRIAL APPLICABILITY The present invention relates to a method for molding a composite resin molded product in which a synthetic resin secondary molded product is integrally formed inside a primary molded product having a synthetic resin undercut, and a molding metal. Regarding the type.

Conventionally, as a method for molding such a composite resin molded body, the applicant of the present application has separated the fixed mold and the slide mold located on the fixed side with respect to the parting line from each other and the movable mold located on the movable side. In the first position, the slide mold is clamped by engaging one of the two advance / retreat units with one of the two split mold units and engaging the other of the two advance / retreat units with the other of the two split mold units. In the state, the fixed mold, the slide mold and the movable mold are clamped, the other advancing / retreating unit in the engaged state is fixed to the fixed mold to the other split mold unit, and the two primary moldings in the movable mold are performed. The primary molding resin material is injected into the cavity for primary molding formed by one of the cores and one split unit in the mold-clamped state on the slide mold side to mold the primary molded product, and the movable product is formed. For secondary molding formed by a mold, a secondary molding core located between two primary molding cores, and a molded primary molded product set in the other split mold unit of the slide mold. In the first step of injecting a secondary molding resin material into the cavity of the above, forming a secondary molded product, and forming a composite molded product in which the secondary molded product and the previously molded primary molded product are integrated. , The fixed mold, the slide mold and the movable mold are separated from each other, the other advancing / retreating unit is transferred to the fixed mold, and the other split mold unit is opened in the mold open state. In the second step of molding and taking out the composite molded product set in the movable mold, the slide mold is fastened to the fixed mold, and the other advancing / retreating unit is fixed after being released from the fixed mold. The third step of opening the slide mold with respect to the mold, shifting the other advancing / retreating unit to the slide mold side, and molding the other split mold unit, and the primary molded product molded by the first step. In the held state, the slide mold in which the two advancing / retreating units are engaged and the two split mold units are in the mold clamping state is slid to the second position with respect to the movable mold, and then the mold is clamped. One advancing / retreating unit in the engaged state is fixed to the fixed mold, and the other of the two primary molding cores in the movable mold and the other split mold in the mold-tightened state on the slide mold side. The primary molding resin material is injected into the primary molding cavity formed by the unit and the primary molding product is molded, and at the same time, one of the movable mold, the secondary molding core, and the slide mold is formed. In the cavity for secondary molding formed by the molded primary molded product set in the split die unit, the secondary molding tree The fourth step of injecting a fat material to form a secondary molded product and forming a composite molded product in which the secondary molded product and the previously molded primary molded product are integrated, a fixed mold, and a slide die. The mold and the movable mold are separated from each other, one advancing / retreating unit is transferred to the fixed mold, one split mold unit is opened, and then molded by the fourth step to form a movable mold. In the fifth step of taking out the composite molded product in the set state, the slide mold is fastened to the fixed mold, and after the fixed state of one advancing / retreating unit to the fixed mold is released, the slide mold is attached to the fixed mold. The slide is held in the sixth step of opening the mold, shifting one advancing / retreating unit to the slide mold side, and mold-fastening one split die unit, and the primary molded product molded by the fourth step. Composite molding in which the primary molded product and the composite molded product are continuously molded by repeating the same molding step as the first step after sliding the mold to the first position with respect to the movable mold. A method for molding a product has been developed (see, for example, Patent Document 1).

According to the present invention, when the mold is opened after molding the composite molded product, one of the advancing / retreating units of the two split mold units for molding the composite molded product is separated from the split mold unit and the split mold unit is opened. Since it is in a state, even if an undercut is formed in the primary molded product, the composite molded product can be opened with the composite molded product set on the movable mold side, so that the composite molded product is assured. Can be taken out.
After taking out the composite molded product, the slide mold is fastened to the fixed mold, the advancing / retreating unit is released from the fixed state to the fixed mold, and then the slide mold is opened to the fixed mold. Since the slide mold is slid after the advancing / retreating unit is moved to the slide mold side, it is possible to continuously mold the composite molded product in which the undercut is formed in the primary molded product.

Japanese Patent No. 6109285

However, in the above-mentioned prior art, the composite molded product can be continuously formed, and even if there is an undercut portion in the portion of the primary molded product to be molded on the slide mold side, the composite molded product can be formed in the mold open state. It is a very excellent invention in that it remains in the movable mold and can be taken out reliably, but since the cavity for secondary molding is located on the movable mold side of the primary molded product and is hidden, it is a composite. Depending on the shape of the molded product, it may be necessary to form a submarine gate (tunnel gate) on the movable mold side, bypass the primary molded product, and inject the secondary molding resin from the inside.

The present invention is based on the above-mentioned prior art, and when the secondary molding resin is injected from the fixed side, a submarine gate (tunnel gate) or the like may be required on the movable mold side depending on the shape of the composite molded product. In view of the above, the fixed mold located on the fixed side with respect to the parting line and the slide mold and the movable mold at the first position in which the advancing / retreating unit is engaged with the split mold unit located on the movable side are molded. The process, the fixed-side primary molding part of the fixed-side primary molding part in the fixed mold, the split mold unit in the mold-tightened state of the slide mold, and the movable-side primary molding part of the movable-side primary molding part in the movable mold. The step of injecting the primary molding resin material into the cavity for primary molding formed by the above to mold the primary molded product, the step of separating the fixed mold, the slide mold and the movable mold from each other, and the advancing / retreating unit The step of sliding the slide mold in a state where the primary molded product is held in the split mold unit in the engaged state and the mold tightening state to the second position, and the mold clamping of the fixed mold, the slide mold and the movable mold are performed. The process of fixing the advancing / retreating unit to the movable mold, the fixed mold, the fixed-side secondary molding portion of the fixed-side secondary molding portion, and the molded primary set in the split mold unit of the slide mold. The secondary molding resin material is injected into the cavity for secondary molding formed by the molded product and the movable side secondary molding portion of the movable side secondary molding portion in the movable mold to mold the secondary molded product. Then, the process of forming a composite molded product in which the secondary molded product and the previously molded primary molded product are integrated, and the mutual of the fixed mold, the slide mold, and the movable mold in which the advancing / retreating unit is fixed. The process of taking out the composite molded product from the split mold unit that has been opened, and the slide mold is fastened to the movable mold, and the fixed state of the advancing / retreating unit to the movable mold is released. The process and the process of opening the slide mold with respect to the movable mold, moving the advancing / retreating unit to the slide mold side, tightening the split mold unit, and then sliding the slide mold to the first position. By continuously molding the composite molded product as one cycle, the cavity for secondary molding is formed on the fixed mold side with respect to the primary molded product, and the secondary molding is performed from the fixed mold into the cavity for secondary molding. The above problem is solved by making the resin material injectable.

In short, in the inventions according to claims 1 and 2, when the mold is opened after molding the composite molded product, the advancing / retreating unit of the split mold unit for molding the composite molded product is separated from the split mold unit and the split mold unit is placed in the mold open state. Even if an undercut is formed on the primary molded product, the composite molded product can be opened with the composite molded product set on the slide mold side, so that the composite molded product can be reliably taken out. Can be done.
After taking out the composite molded product, the slide mold is fastened to the movable mold, the fixed state of the advancing / retreating unit to the movable mold is released, and then the slide mold is opened to the movable mold. Since the slide mold is slid after moving the advancing / retreating unit to the slide mold side, it is possible to continuously mold a composite molded product in which an undercut is formed in the primary molded product. Moreover, since the secondary molding cavity can be positioned on the fixed mold side with respect to the primary molded product, the secondary molding resin material is placed in the secondary molding cavity, and the submarine gate (tunnel gate) is placed on the movable mold side. The practical effect is enormous, such as being able to inject from a fixed mold without forming such a thing.

FIG. 5 is a vertical cross-sectional view showing a state in which a slide mold in a molding mold for a composite resin molded product according to the present invention is in the first position. FIG. 5 is a vertical cross-sectional view showing a state in which a slide mold in a molding mold for a composite resin molded product according to the present invention is in the first position. It is sectional drawing of the primary molded product cavity at the 1st position. It is sectional drawing of the primary molded product cavity at the 2nd position. It is sectional drawing of the secondary molded article cavity. It is sectional drawing of the primary molded product. It is sectional drawing of the composite molded article. It is sectional drawing which shows the state which injected the primary molding resin in the state after molding. It is sectional drawing which shows the mold opening state from the state of FIG. It is sectional drawing which shows the state which the movable mold was molded with respect to the slide mold from the state of FIG. It is sectional drawing which shows the state which moved the movable mold from the state of FIG. 10 to the position where the slide mold can slide. It is sectional drawing which shows the state which injected the secondary molding resin in the state after molding. It is sectional drawing which shows the mold opening state from the state of FIG. It is sectional drawing which shows the state which the movable mold was molded with respect to the slide mold from the state of FIG. It is sectional drawing which shows the state which moved the movable mold from the state of FIG. 14 to the position where the slide mold can slide. It is a horizontal sectional view of a movable mold.

The molding die of the composite molded product according to the present invention is a mold in which the secondary molded product W2 is integrally molded inside the primary molded product W1 having the undercut portion W1c to obtain the composite molded product W. As shown in FIGS. 1 and 2, the movable mold 3 is composed of a fixed mold 1 located on the fixed side with respect to the parting line, a slide mold 2 located on the movable side, and a movable mold 3. On the other hand, the slide mold 2 is detachable.

In the fixed mold 1, the fixed-side secondary molding portions 5 are arranged in rows in the slide direction of the slide mold 2 between the two fixed-side primary molding portions 4 and 4a.

One fixed-side primary molding part 4 is at least one fixed-side primary molding part 6, and the other fixed-side primary molding part 4a is the same number of fixed-side primary molding parts 6a as the fixed-side primary molding part 6. It is composed of.
The fixed side secondary molding portion 5 is composed of the same number of fixed side secondary molding mold portions 7 as the fixed side primary molding mold portion 6, and the fixed side primary molding mold portions 6, 6a and the fixed side secondary molding mold portion 7 are , The slide mold 2 is arranged in a row in the slide direction.

The slide mold 2 has a first molding portion 8 and a second molding portion 8a.
The first molding portion 8 has the same number of molding recesses 9 forming the outer surface of the primary molded product W1 as the fixed side primary molding mold portion 6 and the fixed side secondary molding mold portion 7, and the second molding portion 8 also has the same number of molding recesses 9. The molding recesses 9a of the above are provided, and the undercut portion W1c formation portion 10 is formed in each of the molding recesses 9 and 9a.

In the slide mold 2, the split mold units 11 and 11a are installed, and the split mold units 11 and 11a are formed with molding recesses 9 and 9a in the mold-tightened state, and the split mold units 9 and 9a are each of a plurality of split molds. It has blocks 12, 12a ...

The split mold unit 11 of the first molding site 8 is removed by the advance / retreat unit 13 of the split mold blocks 12, 12a ..., And the split mold unit 11a of the second molding portion 8a is removed by the advance / retreat unit 13a of the split mold blocks 12, 12a .... Engaged as possible.
Then, a gap is created between the molding recesses 9 and 9a of the split mold units 11 and 11a in which the advancing and retreating units 13 and 13a are engaged and in the mold-clamped state and the fixed-side primary molding mold portions 6 and 6a in the mold-clamped state. The composite molded product W can be pulled out without being caught by the undercut portion W1c in the mold-opened state.

The movable mold 3 is provided with fixing means 14 for one of the advancing / retreating units 13 and 13a (advancing / retreating units 13 and 13a engaged with the split mold units 11 and 11a for molding the secondary molded product W2), and the movable mold 3 is provided. If the fixing means 14 is effective when the slide mold 2 is opened, one of the advancing / retreating units 13 and 13a is fixed to the movable mold 3 and removed from the split mold units 11 and 11a when the mold is opened. The split mold units 11 and 11a are in the mold open state, and if the fixing means 14 is not effective, the split mold units 11 and 11a are in the mold open state with the advance / retreat units 13 and 13a engaged with the split mold units 11 and 11a at the time of mold opening. I try to keep it tightened.

In the movable mold 3, the movable side secondary molding portions 16 are arranged in rows in the slide direction of the slide mold 2 between the two movable side primary molding portions 15 and 15a.

One movable side primary molding part 15 has the same number of movable side primary molding parts 17 as the fixed side primary molding mold part 6, and the other movable side primary molding part 15a has the same number of movable side primary molding parts 17 as the movable side primary molding part 17. It has a side primary molding die 17a.
The movable side secondary molding portion 16 has the same number of movable side secondary molding mold portions 18 as the movable side primary molding mold portion 17, and the movable side primary molding mold portions 17, 17a and the movable side secondary molding mold portion 18 are , The slide mold 2 is arranged in a row in the slide direction.

One cavity 19 of the primary molded product W1 is composed of a fixed mold 1, a fixed-side primary mold portion 6, a split mold unit 11 in a mold-tightened state of the slide mold 2, and a movable-side primary mold portion 17. The other cavity 19a of the primary molded product W1 formed is the fixed mold 1, the fixed-side primary molding mold portion 6a, the split mold unit 11a in the mold-tightened state of the slide mold 2, and the movable-side primary molding mold portion. Formed by 17a.

One cavity 20 of the secondary molded product W2 is a fixed mold 1, a fixed side secondary molding portion 7, and a primary molded product W1 in a mold-tightened state of the slide mold 2. , The other cavity 20a of the secondary molded product W2 is formed by the movable side secondary molding die portion 18, and the fixed mold 1, the fixed side secondary molding die portion 7, and the slide mold 2 are in a molded state. It is formed by the primary molded product W1 in the set state and the movable side secondary molded portion 18 in the split mold unit 11a.

The slide mold 2 is in the first position of the one primary molding cavity 19 and the other secondary molding cavity 20a, and the other primary molding cavity 19a and the other secondary molding cavity 20 are slide molds. The mold 2 is formed by being molded in the second position.

The slide mold 2 is formed so as not to hit the other fixed-side primary molding portion 4a in the first position state and one fixed-side primary molding portion 4 in the second position state at the time of mold clamping. There is.

First, the preformed primary molded product W1 is set in the split mold unit 11a in the mold-tightened state at the second molding portion 8a of the slide mold 2, and the fixed mold 1, the slide mold 2, and the movable mold 3 are set. A state in which they are separated from each other will be described as an initial state.

[First step]
The fixed mold 1 in the mold open state, all the split mold units 11 and 11a are engaged with the advancing and retreating units 13 and 13a to mold the slide mold 2 and the movable mold 3 in the first position in the mold tightening state. The primary molding resin material is injected into one primary molding cavity 19 to form the primary molded product W1 (see FIG. 5), and at the same time, the other advancing / retreating unit 13a is fixed to the movable mold 3 by the fixing means 14. Then, a secondary molding resin material different from the primary molding resin material is injected into the other secondary molding cavity 20a to form the secondary molded product W2, and the previously molded primary molded product W is molded. (See FIGS. 8 and 12).

[Second step]
When the fixed mold 1 and the slide mold 2 are separated from each other and then the slide mold 2 and the movable mold 3 are separated from each other, one advancing / retreating unit 13 remains on the slide mold 2 side and the other. The advancing / retreating unit 13a of the above moves to the movable mold 3 side to open the other split mold unit 11a, and the primary molded product W1 and the composite molded product W molded by the first step remain on the slide mold 2 side. ,, The composite molded product W is taken out from the other split mold unit 11a which is completely opened (see FIGS. 9 and 13).
[Third step]
The slide mold 2 is clamped to the movable mold 3, and the fixing state of the other advancing / retreating unit 13a to the fixed mold 1 by the fixing means 14 is released (see FIGS. 10 and 14).

[Fourth step]
The movable mold 3 is separated from the slide mold 2 to a position where the slide mold 2 can slide, and one advancing / retreating unit 13 remains engaged with one split mold unit 11 and the other advancing / retreating unit. After 13a is engaged with the other split die unit 11a (see FIGS. 11 and 15), the slide mold 2 in which both advancing and retreating units 13 and 13a are engaged with the two split die units 11 and 11a is attached to the second. Slide to 2 positions.

[Fifth step]
(1) The fixed mold 1, the slide mold 2 and the movable mold 3 are molded, and the primary molding resin material is injected into the other primary molding cavity 19a to form the primary molded product W1. After fixing one of the advancing / retreating units 13 to the movable mold 3 by the fixing means 14, a secondary molding resin material different from the primary molding resin material is injected into one of the secondary molding cavities 20 to form a secondary molded product. W2 is formed to form a composite molded product W integrated with the previously molded primary molded product W1 (see FIGS. 8 and 12).

[Sixth step]
When the fixed mold 1 and the slide mold 2 are separated from each other and then the slide mold 2 and the movable mold 3 are separated from each other, the other advancing / retreating unit 13a remains on the slide mold 2 side, and one of them. The advancing / retreating unit 13 is moved to the movable mold 3 side to open one of the split mold units 11, and the primary molded product W1 and the composite molded product W molded by the fourth step remain on the slide mold 2 side. , The composite molded product W is taken out from one of the split mold units 11 which is completely opened (see FIGS. 9 and 13).

[7th step]
The slide mold 2 is clamped to the movable mold 3, and the fixed state of the fixing means 14 to the one advancing / retreating unit 13 is released (see FIGS. 10 and 14).

[8th step]
The movable mold 3 is separated from the slide mold 2 to a slideable position of the slide mold 2, the other advancing / retreating unit 13a remains engaged with the slide mold 2, and one advancing / retreating unit 13 is moved. After engaging with one of the split mold units 9 (see FIGS. 11 and 15), the slide mold 2 is slid to the first position.

Then, the primary molded product W1 and the composite molded product W are continuously molded at the same time, with the first to eighth steps as one cycle.

The flanged tubular body W, which is a composite molded product, is composed of a ring-shaped flange portion W1 which is a primary molded product and a tubular portion W2 which is a secondary molded product, and the flange portion W1 is formed in an intermediate portion of the tubular portion W2. An undercut portion W3 is formed on the outer peripheral portion of the flange portion W1.

In the fixed mold 1, one fixed-side primary molding portion 4 is composed of one fixed-side primary molding portion 6, and the other fixed-side primary molding portion 4a is composed of one fixed-side primary molding portion 6a. The fixed-side secondary molding portion 5 is composed of one fixed-side secondary molding die portion 7.

In the slide mold 2, the first molding portion 8 is composed of one split mold unit 11, and the second molding portion 8a is composed of one split mold unit 11a.

In the movable mold 3, one movable-side primary molding portion 15 is composed of one movable-side primary molding portion 17, and the other movable-side primary molding portion 15a is composed of one movable-side primary molding portion 17a. The movable side secondary molding portion 16 is composed of one movable side secondary molding mold portion 18.

The primary molding resin flow paths 21 and 21a to the primary molding cavities 19 and 19a are in the fixed mold 1 and the slide mold 2, and the secondary molding resin flow paths 22 to the secondary molding cavities 20 and 20a are fixed molds. It is formed in mold 1.

In the slide mold 2, the slide mold 2 is housed in a rectangular opening 24 formed on a surface facing the fixed mold 1 in the base 23 which can be brought into contact with and detached from the movable mold 3 so as to be slidable back and forth. And the opposite surface of the slide mold 2 to the fixed mold 1 are flush with each other, and the tip end portion of the rod 26 of the cylinder 25 arranged on the end surface portion of the base 23 is fixed to the end surface of the slide mold 2.

Each of the split units 11 and 11a has two split blocks 12 and 12a, and forms an outward and downward inclined surface 27 on the back surface of each split block 12 and 12a in the molded state. ..

Each advancing / retreating unit 13 and 13a has a pair of wedges 28 and 28a, and the inner surfaces of the tips of the wedges 28 and 28a are formed so as to match the inclined surfaces 27 of the split blocks 12 and 12a. An ant 29 is formed on the surface 27, and an ant groove 30 is formed on the surface corresponding to the inclined surface 21 of the wedges 28 and 28a. The ants 29 of the split blocks 12 and 12a enter into 30 to make the split blocks 12 and 12a slidable in the mold clamping direction, and during the mold opening process, the advancing and retreating units 13 and 13a retract and mold the split blocks 12 and 12a. Slide in the opening direction to disengage the ant 26 from the dovetail groove 27.

A pair of recesses 31 and 31a into which the base end portions of the wedges 28 and 28a are fitted are provided in the three locations corresponding to the wedges 28 and 28a at the first and second positions of the slide mold 2 in the fixed mold 1. Is forming.

Penetration portions 32 of wedges 28 and 28a are formed on the base 23, and the tips of the wedges 28 and 28a penetrating the penetration portions 32 can be engaged with the split mold units 11 and 11a.

The fixing means 14 of the advancing / retreating units 13 and 13a are fixed bodies 33 and 33a protruding into the pair of central recesses 31 and 31a, and the engaging recesses 34 and 34a of the fixed bodies 33 and 33a are formed on the wedges 28 and 28a. ing.

The fixed bodies 33 and 33a can slide back and forth in the slide holes 35 and 35a formed in the movable mold 3, and the base end portion is arranged at the end surface portion of the fixed mold 1 at the tip of the rod 37 of the cylinder 36. It is fixed to the fixed block 38 fixed to the part.

The fixed bodies 33 and 33a are elongated plates and have inward protrusions 39 and 39a at the tip, and the protrusions 39 and 39a engage with the engagement recesses 34 and 34a of the wedges 28 and 28a. It is possible.

The slide holes 35 and 35a pass from the end face of the base 23 to the outside of the pair of recesses 31 and 31a, and the width of the tip side is widened toward the pair of recesses 31 and 31a in the center to form widening portions 40 and 40a. By partially intersecting the pair of central recesses 31 and 31a with the portion on the tip side of the widening portions 40 and 40a, the slit 41 at the intersection with the slide holes 35 and 35a in the pair of central recesses 31 and 31a. It forms 41a.

In other words, the projecting pieces 39, 39a can appear and disappear in the pair of recesses 31, 31a in the center, the projecting pieces 39, 39a are located in the widening portions 40, 40a, and the projecting pieces 33, 33a are advanced to project. One part 39, 39a protrudes into the pair of central recesses 31, 31a by the slits 41, 41a, fits into the engaging recesses 34, 34a of the wedges 28, 28a, and the wedges 28, 28a are attached to the movable mold 3. It is possible to fix the wedges 28 and 28a to the movable mold 3 by pulling out the projecting pieces 39 and 39a from the pair of recesses 31 and 31a in the center by retracting the fixed bodies 33 and 33a. ..

On the cylinder 25 side from the first and second molding parts 8 and 8a in the slide mold 2, the fixed side primary molding part 6 in one fixed side primary molding part 4 in the second position and the one movable side primary molding part 15 A relief hole 42 of the movable side primary molding die portion 17 is formed, and the tip of the slide mold 2 is set at a position where the other fixed side primary molding portion 4a at the first position does not collide with the slide mold 2.

In the drawing, the fixed-side primary molding dies 6 and 6a of the fixed mold 1 are convex molds, the fixed-side secondary molding dies 7 are concave dies, and the movable-side primary molding dies 17 and 17a and the movable-side secondary molding dies 17 and 17a. Although the molding die portion 18 has a convex shape, it is not limited to such a form, and is appropriately selected depending on the shape of the composite molded product W.
Further, the first and second molding sites 8 and 8a have one molding recess 9 and 9a, but a plurality of molding recesses 9 and 9a may be provided. In this case, a plurality of split mold units 11 and 11a may be arranged. A plurality of molding recesses 9 and 9a may be formed in one splitting unit 11 and 11a.

1 Fixed mold 2 Slide mold 3 Movable mold 4, 4a Fixed side primary molding part 5 Movable side primary molding part 6, 6a Fixed side primary molding part 7 Movable side primary molding part 8, 8a 1st and 2nd molding Part
11, 11a split type unit
12, 12a ... Split type block
13, 13a Advance / retreat unit
14 Fixing means
15, 15a Fixed side secondary molding site
16 Movable side secondary molding site
17, 17a Fixed side secondary molding mold part
18 Movable side secondary molding mold
19, 19a Primary molding cavity
20, 20a Cavity for secondary molding
21, 21a Primary molding resin material flow path
22 Secondary molding resin material flow path W Composite molded product W1 Primary molded product W2 Secondary molded product

The present invention relates to a method of molding a composite resin molded article was set to molding the integrally-formed composite resin molded article of the secondary molded member made of the inner synthetic resin of the primary molded member having a synthetic resin undercut.

In the present invention, when the secondary molding resin is injected from the fixed side based on the above-mentioned prior art, a submarine gate (tunnel gate) or the like may be required on the movable mold side depending on the shape of the composite resin molded product. In view of the problem, the fixed mold (1) located on the fixed side with respect to the parting line, the slide mold (2) located on the movable side, and the slide mold (2) and the movable mold that can reciprocate between the first position and the second position. A composite in which a primary forming member (W1) formed by primary forming in a mold (3) and a secondary forming member (W2) formed inside the primary forming member (W1) by secondary forming are integrated. A method of molding a resin molded product (W), in which a fixed mold (1) and a split mold unit (11 ) are engaged with an advancing / retreating unit (13) to form a plurality of split molds in the split mold unit (11). The process of molding the slide mold (2) and movable mold (3) at the first position with the split mold unit (11) in the mold-clamped state with the blocks (12, 12a ...) in the forward state, and the fixed mold. The fixed-side primary molding part (6 ) in (1), the split mold unit (11) in the mold-tightened state of the slide mold (2) , and the movable-side primary molding part (17) in the movable mold (3). The step of injecting the primary molding resin material into the cavity (19) of the primary molding member (W1) formed by the above to form the primary molding member (W1) having the undercut portion (W1c), and the fixing mold (1). ) , The step of separating the slide mold (2) and the movable mold (3) from each other, and the primary forming member (W1 ) to the split mold unit (11) in the mold-tightened state with the advancing / retreating unit (13) engaged. The step of sliding the slide mold (2) in the state of holding) to the second position, and the fixed mold (1) , slide mold (2) and movable mold (3) are molded, and the advancing / retreating unit (advancing / retreating unit (3) The process of fixing 13) to the movable mold (3) , the fixed mold (1) , the fixed side secondary molding part (7), and the split mold unit (11) of the slide mold (2). Cavity of the secondary forming member (W2) formed by the primary forming member (W1) formed in the primary forming step and the movable side secondary forming die portion (18) in the movable mold (3). The secondary molding resin material was injected into (20) to form the secondary molding member (W2) , and the secondary molding member (W2) and the previously molded primary molding member (W1) were integrated. The step of molding the composite molded product and the movable mold (3) in which the fixed mold (1) , the slide mold (2) and the movable mold (3) are fixed are separated from each other, and the advancing / retreating unit (advancing / retreating unit ( 3) 13) Withdrawal and multiple split molds The process of taking out the composite resin molded product (W) from the split mold unit (11 ) in which the lock (12, 12a ...) Is retracted and the mold is opened, and the slide mold (2) with respect to the movable mold (3). the well as mold clamping, a step of releasing the fixed state relative to the movable mold (3) of the reciprocating unit (13), sliding die (2) and the mold is opened to the movable mold (3), forward and backward units ( The composite resin molded product (W ) is composed of one cycle of moving 13) to the slide mold (2) side, clamping the split mold unit (11) , and then sliding the slide mold (2) to the first position. ) Is continuously formed, so that the cavities (20, 20a) of the secondary forming member (W2) are formed on the fixed mold (1) side with respect to the unit (11, 11a) , and from the fixed mold (1). The above problem is solved by enabling the secondary molding resin material to be injected into the cavities (20, 20a) of the secondary molding member (W2).

In summary the invention according to claim 1, at the time of mold opening after the composite resin molded article (W) molding, retractable unit (13) a split mold unit of the split type unit for molding composite resin molded article (W) (11) ( since disengaged from 11) are in the manner the state mold opening the split mold unit (11), even if the undercut portion (W1c) is formed in the primary molded member (W1), a composite resin molded article Since the fixed mold (1), the slide mold (2) and the movable mold (3) can be opened with the (W) set on the movable mold (3) side, the composite resin molded product. (W) can be taken out reliably.
Thus also, the composite resin molded article (W) after removal, the movable die (3) sliding die (2) while clamping hand, releasing the fixed state relative to the movable mold (3) of the reciprocating unit (13) After that, the slide mold (2) is opened with respect to the movable mold (3) , the advancing / retreating unit (13) is moved to the slide mold (2) side, and then the slide mold (2) is slid. Therefore, it is possible to continuously mold the composite resin molded product (W) in which the undercut portion (W1c) is formed on the primary molding member (W1) , and the secondary molding member (W2). ) Can be positioned on the fixed mold (1) side with respect to the primary molding member (W1), so that the secondary molding resin material is placed in the cavity (20) of the secondary molding member (W2). The practical effect is enormous, such as being able to eject from the fixed mold (1) without forming a submarine gate (tunnel gate) or the like on the movable mold (3) side.

In the molding die of the composite resin molded product according to the present invention, the secondary molding member W2 is integrally molded inside the primary molding member W1 having the undercut portion W1c to obtain the composite resin molded product W. As shown in FIGS. 1 and 2, the fixed mold 1 located on the fixed side with respect to the parting line, the slide mold 2 and the movable mold 3 located on the movable side are formed, and the movable mold is formed. The slide mold 2 is detachable with respect to 3.

In the fixed mold 1, one fixed-side secondary molding portion 7 is arranged between the two fixed-side primary molding portions 6 and 6a in the slide direction of the slide mold 2.

In the slide mold 2, two split mold units 11 and 11a are installed, and the split mold units 11 and 11a are formed with molding recesses 9 and 9a forming the outer surface of the primary molding member W1 in the molded state. An undercut portion W1c forming portion 10 is formed in each of the molding recesses 9 and 9a, and each of the split mold units 9 and 9a has a plurality of split mold blocks 12, 12a ...

The split type unit 11 is detachably engaged with the advancing / retreating unit 13 of the split type blocks 12, 12a ..., And the split type unit 11a is detachably engaged with the advancing / retreating unit 13a of the split type blocks 12, 12a ....
Then, a gap is formed between the molding recesses 9 and 9a of the split mold units 11 and 11a in which the advancing and retreating units 13 and 13a are engaged and in the mold-clamped state and the fixed-side primary molding mold portions 6 and 6a in the mold-clamped state. The composite resin molded product W can be pulled out without being caught by the undercut portion W1c in the mold-opened state.

The movable mold 3 is provided with fixing means 14 for one of the advancing / retreating units 13 and 13a (advancing / retreating units 13 and 13a engaged with the split mold units 11 and 11a for forming the secondary molding member W2), and the movable mold 3 is provided. If the fixing means 14 is effective when the slide mold 2 is opened, one of the advancing / retreating units 13 and 13a is fixed to the movable mold 3 and removed from the split mold units 11 and 11a when the mold is opened. The split mold units 11 and 11a are in the mold open state, and if the fixing means 14 is not effective, the split mold units 11 and 11a are in the mold open state with the advance / retreat units 13 and 13a engaged with the split mold units 11 and 11a at the time of mold opening. I try to keep it tightened.

In the movable mold 3, one movable side secondary molding mold portion 18 is arranged in a row in the slide direction of the slide mold 2 between two movable side primary molding mold portions 17 and 17a.

One cavity 19 of the primary forming member W1 is composed of a fixed mold 1, a fixed side primary forming mold portion 6, a split mold unit 11 in a mold-tightened state of the slide mold 2, and a movable side primary forming mold portion 17. The other cavity 19a of the primary forming member W1 formed is the fixed mold 1, the fixed side primary forming mold portion 6a, the split mold unit 11a in the mold-tightened state of the slide mold 2, and the movable side primary forming mold portion. Formed by 17a.

One cavity 20 of the secondary forming member W2 includes a fixed mold 1, a fixed side secondary forming mold portion 7, and a primary forming member W1 set in a split mold unit 11 in a mold-tightened state of the slide mold 2. , The other cavity 20a of the secondary molding member W2 is formed by the movable side secondary molding die portion 18, and the fixed mold 1, the fixed side secondary molding die portion 7, and the slide mold 2 are in a molded state. It is formed by the primary forming member W1 in the set state and the movable side secondary forming die portion 18 in the split die unit 11a.

Then, in the cavity 19 of one primary molding member W1 and the cavity 20a of the other secondary molding member W2, the slide mold 2 is in the first position, and the cavity 19a of the other primary molding member W1 and one secondary molding are performed. The cavity 20 of the member W2 is formed by fastening the slide mold 2 in the second position.

First, the primary molding member W1 previously molded in the following [fifth step] is set in the split mold unit 11a in the mold-tightened state of the slide mold 2, and the fixed mold 1, the slide mold 2, and the movable mold 3 are set. The state in which the two are separated from each other will be described as the initial state.

[First step]
The fixed mold 1 in the mold open state, all the split mold units 11 and 11a are engaged with the advancing and retreating units 13 and 13a to mold the slide mold 2 and the movable mold 3 in the first position in the mold tightening state. The primary molding resin material is injected into the cavity 19 of one primary forming portion W1 to form the primary molding member W1 (see FIG. 5), and at the same time, the other advancing / retreating unit 13a is made into the movable mold 3 by the fixing means 14. after a fixed state, into the cavity 20a of the other of the secondary molded member W2, primary molding resin material different secondary molding resin material injected to form a secondary molding member, W2, primary molded member formed above A composite resin molded product W integrated with W1 is molded (see FIGS. 8 and 12).

[Second step]
When the fixed mold 1 and the slide mold 2 are separated from each other and then the slide mold 2 and the movable mold 3 are separated from each other, one advancing / retreating unit 13 remains on the slide mold 2 side and the other. The advancing / retreating unit 13a of the above moves to the movable mold 3 side, the other split mold unit 11a is opened, and the primary molding member W1 and the composite resin molded product W molded by the first step are moved to the slide mold 2 side. The remaining composite resin molded product W is taken out from the other split mold unit 11a that has been completely opened (see FIGS. 9 and 13).

[Third step]
The slide mold 2 is clamped to the movable mold 3, and the fixing state of the other advancing / retreating unit 13a to the fixed mold 1 by the fixing means 14 is released (see FIGS. 10 and 14).

[Fourth step]
The movable mold 3 is separated from the slide mold 2 to a position where the slide mold 2 can slide, and one advancing / retreating unit 13 remains engaged with one split mold unit 11 and the other advancing / retreating unit. After 13a is engaged with the other split die unit 11a (see FIGS. 11 and 15), the slide mold 2 in which both advancing and retreating units 13 and 13a are engaged with the two split die units 11 and 11a is attached to the second. Slide to 2 positions.

[Fifth step]
(1) The fixed mold 1, the slide mold 2, and the movable mold 3 are molded , and the primary molding resin material is injected into the cavity 19a of the other primary molding member W1 to form the primary molding member W1. At the same time, one advancing / retreating unit 13 is fixed to the movable mold 3 by the fixing means 14, and then a secondary molding resin material different from the primary molding resin material is injected into the cavity 20 of one secondary molding member W2. The secondary molding member W2 is formed, and the composite resin molded product W integrated with the previously molded primary molding member W1 is molded (see FIGS. 8 and 12).

[Sixth step]
When the fixed mold 1 and the slide mold 2 are separated from each other and then the slide mold 2 and the movable mold 3 are separated from each other, the other advancing / retreating unit 13a remains on the slide mold 2 side, and one of them. The advancing / retreating unit 13 is moved to the movable mold 3 side to open one of the split mold units 11, and the primary molding member W1 and the composite resin molded product W molded by the fourth step are moved to the slide mold 2 side. The composite resin molded product W is taken out from the remaining split mold unit 11 which is completely opened (see FIGS. 9 and 13).

[7th step]
The slide mold 2 is clamped to the movable mold 3, and the fixed state of the fixing means 14 to the one advancing / retreating unit 13 is released (see FIGS. 10 and 14).

[8th step]
The movable mold 3 is separated from the slide mold 2 to a slideable position of the slide mold 2, the other advancing / retreating unit 13a remains engaged with the slide mold 2, and one advancing / retreating unit 13 is moved. After engaging with one of the split mold units 9 (see FIGS. 11 and 15), the slide mold 2 is slid to the first position.

Then, the primary molding member W1 and the composite resin molded product W are continuously molded at the same time, with the first to eighth steps as one cycle.

It flanged cylindrical body W is a composite resin molded product, a ring-shaped collar portion W1 is a primary molded member formed of a cylindrical portion W2 is a secondary molded member, the collar portion W1 in the middle portion of the cylindrical portion W2 It is formed, and an undercut portion W3 is formed on the outer peripheral portion of the flange portion W1.

The fixed mold 1 has two fixed-side primary mold portions 6, 6a and one fixed-side secondary mold portion 7 .

The slide mold 2 has two split mold units 11 and 11a .

The movable mold 3 has two movable-side primary molding mold portions 17, 17a and one movable-side secondary molding mold portion 18 .

The primary molding resin flow paths 21 and 21a of the primary molding member W1 to the cavities 19 and 19a are connected to the fixed mold 1 and the slide mold 2 and the secondary molding resin flow paths of the secondary molding member W2 to the cavities 20 and 20a. 22 is formed in the fixed mold 1.

Each advancing / retreating unit 13 and 13a has a pair of wedges 28 and 28a, and the inner surfaces of the tips of the wedges 28 and 28a are formed so as to match the inclined surfaces 27 of the split blocks 12 and 12a. An ant 29 is formed on the surface 27, and an ant groove 30 is formed on the surface corresponding to the inclined surface 21 of the wedges 28 and 28a. The ants 29 of the split blocks 12 and 12a enter into 30 to make the split blocks 12 and 12a slidable in the mold clamping direction, and during the mold opening process, the advancing and retreating units 13 and 13a retract and mold the split blocks 12 and 12a. Slide in the opening direction so that the ant 29 comes out of the dovetail groove 30.

1 Fixed mold 2 Slide mold 3 Movable mold
6 Fixed side primary molding mold
7 Fixed side secondary molding mold
11% type unit
12, 12a ... Split type block
13 Advance / retreat unit
17 Movable side primary molding mold
18 Movable side secondary molding mold
19 Cavity of primary molded member
20 Cavity of secondary molded member W Composite resin molded product W1 Primary molded member
W1c Undercut part W2 Secondary molding member

Claims (1)

The process of molding the fixed mold located on the fixed side with respect to the parting line, and the slide mold and movable mold at the first position in which the advancing / retreating unit is engaged with the split mold unit located on the movable side.
It is formed by the fixed side primary molding part of the fixed side primary molding part in the fixed mold, the split mold unit in the mold-tightened state of the slide mold, and the movable side primary molding part of the movable side primary molding part in the movable mold. The process of injecting a primary molding resin material into a cavity for primary molding to form a primary molded product,
The process of separating the fixed mold, slide mold and movable mold from each other,
A step of sliding the slide mold to the second position with the primary molded product held in the split mold unit in the mold-tightened state with the advancing / retreating unit engaged.
The process of fixing the fixed mold, slide mold and movable mold, and fixing the advancing / retreating unit to the movable mold,
The fixed mold, the fixed-side secondary molding portion of the fixed-side secondary molding portion, the molded primary molded product set in the split mold unit of the slide mold, and the movable-side secondary in the movable mold. A secondary molding resin material is injected into a cavity for secondary molding formed by a movable side secondary molding mold portion of a secondary molding part to mold a secondary molded product, and the secondary molded product is molded first. The process of molding a composite molded product that integrates the primary molded product
A process in which the fixed mold, the slide mold, and the advancing / retreating unit are separated from each other in the fixed movable mold, and the composite molded product is taken out from the split mold unit in the mold open state.
The process of fastening the slide mold to the movable mold and releasing the fixed state of the advancing / retreating unit to the movable mold, and
One cycle consists of opening the slide mold with respect to the movable mold, moving the advancing / retreating unit to the slide mold side, tightening the split mold unit, and then sliding the slide mold to the first position. A method for molding a composite molded product, which comprises continuously molding the composite molded product.

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