JPS6341136Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Field of the Invention>> This invention relates to an improvement of an injection molding apparatus for integrally inserting and molding insert parts made of synthetic resin primary moldings such as profile extrusions.

<<Prior Art and its Problems>> For example, the notched end face of a synthetic resin primary molded body made of a profile extrusion molded body is sometimes coated with a separate synthetic resin to border the end.

In this case, the above-mentioned primary molded body is made of a synthetic resin with a relatively high melting point, and this primary molded body is installed to protrude into the cavity of the insert molding die, and the above-mentioned primary molded body is A resin with a low melting point is injection molded to cover the ends, and it is configured to be integrated.

In this case, the portion of the primary molded body that protrudes into the cavity is formed by forming irregularities on the template in accordance with its irregularly shaped cross section.
If the precision of both molds is poor, the insert resin will flow out from this part toward the primary molded body, causing burrs.

Furthermore, even if the shape of such parts is made with high precision, extrusion molded products generally have some degree of dimensional error due to the molding conditions, etc., so it is possible to prevent the occurrence of such burrs. It's not something. Further, since the above-mentioned primary molded product is sandwiched and pressed between the two molds, there are problems such as the outer surface of the product is easily damaged.

《Purpose of the invention》 This invention was created in view of the above-mentioned problems.The purpose of this invention is to solve both The mold cavity and the joint between the insert parts can be reliably sealed, and even if the primary molded product has poor dimensional accuracy, it can be integrated with high precision, and the primary molded product can be prevented from being damaged. The purpose of this invention is to provide an injection molding apparatus that provides the following advantages.

《Structure and effect of the invention》 In order to achieve the above purpose, this invention
It has a fixed-side template in which a fixed-side core mold is embedded, and a movable-side template in which a movable-side core mold is embedded, and a cavity is formed on the parting surfaces of both templates, and this In an injection molding apparatus in which an insert part made of a primary molded synthetic resin body is arranged protrudingly within a cavity, a space formed on a parting surface formed between the mold plates and into which the insert part is inserted is formed. , facing between the movable mold plate and the fixed core mold,
and are formed protrudingly at predetermined intervals, and
The protruding end of the insert part has a seal tooth having a substantially triangular cross section that seals the inner and outer periphery of the cavity by slightly biting into both the front and back sides of the insert part, and a seal tooth that is provided on the upper part of the fixed side core mold, and that is provided on the upper part of the fixed side core mold. It is characterized by comprising an adjustment bolt for variably adjusting the meshing pressure of the seal teeth, and an elastic member such as silicone rubber placed and filled in the space.

That is, (a) the present invention completely covers the inner and outer peripheries of the cavity with both templates engaging the front and back sides of the protruding end of the insert part in the cavity and with the seal teeth slightly biting into the outer periphery of the insert part. Since this type of insert molding is designed to seal, there is no risk of burrs forming between the two molds during conventional insert molding, that is, between the insert resin and the primary injection molded product, and it is possible to create a good seal. Not only can a molded body be obtained, but trimming work after molding can be omitted.
The molding operation can be greatly simplified.

(b) Also, according to the present invention, the insert part is made of a primary molded synthetic resin having elasticity, and an adjustment bolt is provided on the upper part of the fixed side core mold, and by adjusting the threading of this adjustment bolt. Since the meshing pressure of the seal teeth with respect to the insert part can be variably adjusted, even if a dimensional error occurs in the thickness of the insert part, the dimensional error can be easily absorbed, and therefore the inner and outer peripheries of the cavity can be reliably sealed.

(c) Furthermore, in the present invention, an elastic member such as silicone rubber is installed and filled in the space formed between the fixed side template and the movable side template, so that the gap between the two templates is There is no risk of damage to the insert parts due to pressure welding, and the insert parts are held under pressure by this elastic member, so there is no risk of the insert parts moving due to injection pressure, and the insert parts can be positioned reliably. Since it can be fixed, it has the effect of making it possible to obtain a better molded product.

<<Description of Embodiments>> Embodiments of this invention will be described in detail below with reference to the drawings.

The drawing shows a cross section of the main parts of the injection molding apparatus of the present invention, and this injection molding apparatus includes a fixed side mold plate 1, a movable side mold plate 2 that is removably engaged with the fixed side mold plate 1, It is composed of a fixed side core mold 3 embedded in a fixed side mold plate 1 and a movable side core mold 4 buried in a movable side mold plate 2, and the fixed side core mold 3 and the movable side core mold 3 are A predetermined cavity 5 is formed between the side core mold 4 and the movable side mold plate 2, and molten resin is injection molded into the cavity 5 through a sprue, a runner 7, and a gate 8 (not shown). It is configured as follows.

Further, in the vicinity of the cavity 5, a gap 9 of a predetermined shape is provided on the parting surface of each template 1, 2.
9 is formed, and an insert part 10 made of a synthetic resin primary molded body having elasticity, such as a profile extrusion molded body, is inserted into this space 9, and its tip portion protrudes into the cavity 5. This space 9 is filled with an elastic member 20 having high elasticity and heat resistance, such as silicone rubber.

At the insertion point of the insert part 10 of the cavity 5, seal teeth 11 and 12 having a substantially triangular cross section are arranged facing each other and spaced apart from each other by a predetermined distance between the movable mold plate 2 and the fixed core mold 3. are formed, and these seal teeth 11,1
2 engages with the front and back surfaces of the protruding end of the insert component 10 in a slightly biting state, thereby reliably sealing the inner and outer peripheries of the cavity 5.

These seal teeth 11 and 12 are arranged so that when the insert part 10 is, for example, a profile extrusion molded product, the insert part 10 is inserted in a direction perpendicular to the plane of the paper.
It has a concave and convex shape that follows the shape of the tooth, and each end face has a triangular mountain-shaped tooth as described above.

Further, a pressing spring 13 and an adjusting screw are arranged on the back side of the movable core mold 4, and the pressure of the spring 13 causes the parting surface of the movable core mold 4 to be moved toward the fixed side. It is constructed so that it is constantly pressed against the parting surface of the core mold 5, and the amount of pressure can be adjusted using an adjustment screw 14.

The pressure of the spring 13 is sufficient to counter the injection pressure, and does not affect the molding of the molten resin in any way.

Further, an adjustment bolt 15 for adjusting the movement is inserted into the upper part of the fixed side core mold 3, and the insert part 1 is adjusted by threading the adjustment bolt 15.
The meshing pressure of the seal teeth 11 and 12 with respect to 0 can be variably adjusted, and a spring 13 provided on the back surface of the movable core mold 4
Accordingly, the meshing pressure between the cavity 5 and the insert part 10 can be balanced and adjusted with an appropriate meshing pressure.

Therefore, according to the above configuration, the adjustment bolt 15
Through this adjustment, even if a dimensional error occurs in the thickness of the insert component 10, it can be sufficiently absorbed.

When performing insert molding using a mold configured in this way, the elastic members 20, 20 are arranged and filled in the space 9, and then the insert part 10 is installed as shown in the figure. Then, after the mold plates 1 and 2 are engaged, the molten resin is injected into the cavity 5 through the runner 7 and the gate 8, and the molten resin is filled in the cavity 5 and solidified. Due to the injection pressure, the flow tends to flow between the insert part 10 and the seal teeth 11 and 12 toward the space 9, but in this part, each of the seal teeth 11 and 12 is slightly 3. Since the insert part 10 is held in the inserted shape, there is no risk of resin leakage from this part, that is, burr generation.

As described above, according to the injection molding apparatus of the present invention, the front and back surfaces of the protruding ends into the cavity of the insert part are configured so that the inner and outer peripheries of the cavity are sealed by the seal teeth. Since there is no risk of burrs occurring between the two and there is no need to perform trimming work after molding, the molding work can be greatly simplified. In addition, since an elastic member is arranged and filled in the above-mentioned space, there is no risk of damaging the insert part due to pressure contact between the two mold plates, and the insert part can be reliably positioned and fixed, making it even better. A molded article can be obtained.

[Brief explanation of the drawing]

The drawing is an enlarged sectional view showing the main parts of the injection molding apparatus of the present application. 1... Fixed side template, 2... Movable side template, 3...
Fixed side core mold, 4... Movable side core mold, 5...
Cavity, 9... Air gap, 10... Insert part, 11, 12... Seal tooth, 20... Elastic member.

Claims (1)

[Scope of Claim for Utility Model Registration] A fixed-side template formed by embedding a fixed-side core mold,
It has a movable side mold plate in which a movable side core mold is embedded, a cavity is formed on the parting surfaces of both of the mold plates, and an insert part made of a synthetic resin primary molded body is protruded and arranged in this cavity. In the injection molding apparatus, a space formed on a parting surface formed between the mold plates and into which the insert part is inserted, and a space facing between the movable mold plate and the fixed core mold. , and seal teeth having a substantially triangular cross section that are formed to protrude at a predetermined interval and slightly bite into both the front and back sides of the protruding end of the insert part to seal the inner and outer periphery of the cavity, and the fixed side core metal. An adjustment bolt is provided on the upper part of the mold and variably adjusts the engagement pressure of the seal teeth with respect to the insert part, and an elastic member such as silicone rubber is arranged and filled in the space. Characteristic injection molding equipment.