JP6787577B2 - Injection molding equipment and injection molding method - Google Patents

Description

The present invention relates to a technique for molding a product, and more particularly to a technique for injecting a product using a viscous material as a raw material.

There is already a sealing method for sealing a structure by applying a liquid sealing material or a caulking material (hereinafter collectively referred to as “sealing material”) made of a viscous material to the structure. The sealing method is, for example, to fill a gap between two members of a structure (for example, a joint between two overlapping members, a joint between two abutted members, etc.) with a liquid sealing material. It is done for the purpose of filling.

In order to perform this sealing method, conventionally, an operator has a coating gun filled with a liquid sealing material, and the discharge port of the coating gun is moved along a planned sealing portion in the structure. The coating gun is loaded with a cartridge prefilled with a liquid sealing material, and the coating gun pushes the liquid sealing material with respect to a target portion by a required amount by driving the cartridge with a high-pressure source or a motor.

However, in this conventional sealing method, if the operator is not skilled, the cross-sectional shape of the sealing material actually applied on the structure differs depending on the location, and the actual sealing performance may not be stable. There was a problem.

On the other hand, Patent Document 1 discloses a product that should also be called a premold sealing material.

The present inventors have conducted research on the premolded sealant, and as a result, obtained the following findings.

That is, the present inventors can freely manufacture a continuously extending longitudinal product as a premold sealing material (solid sealing material) in any shape by injection molding (for example,). I noticed the advantage that the cross section can be changed at any position unlike extrusion molding).

The present inventors further have the potential that the gas in the molding mold or the gas in the raw material may cause defective parts such as surface recesses and voids in the final product during the injection molding process. I also noticed some drawbacks.

On the other hand, in Patent Document 2, a vent portion is provided in the upper mold of the molding mold for injection molding, and a filter is arranged in the vent portion, thereby preventing the molding material from entering the vent portion. It discloses the points to be done.

Jikken Sho 63-9689 Japanese Unexamined Patent Publication No. 2012-666533

However, Patent Document 2 discloses that when the raw material is a viscous material, filtering that the gas passes through the gas vent but does not pass through the viscous material can be realized without using a filter as an additional component. Not.

Against this background, the present invention is a technique for injecting and molding a product, in which defective parts such as surface recesses and voids are generated in the final product due to the gas in the molding mold or the gas in the raw material. The challenge was to provide a technology that could reduce the possibility of a flatulence.

In order to solve this problem , according to the first aspect of the present invention, it is an injection molding apparatus that injects and molds a longitudinal product using a viscous material as a raw material.
Including a molding that defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold is
An injection inlet of the viscous material formed at one end of the cavity and
An injection port of the viscous material formed at the other end of the cavity,
With a gas vent that generally extends linearly between the inlet and outlet
An injection molding apparatus including the above is provided.

Further, according to the second aspect of the present invention, it is an injection molding method in which a longitudinal product is injection-molded from a viscous material which is a thermosetting synthetic resin using a molding die.
The molding mold defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold is
An injection inlet of the viscous material formed at one end of the cavity and
An injection port of the viscous material formed at the other end of the cavity,
Includes gas vents that generally extend linearly between the inlet and outlet.
In the injection molding method, the viscous material is injected into the cavity from the injection inlet of the cavity while degassing using the injection outlet and the gas vent, whereby the cavity is made of the viscous material. Filling process and filling process
An injection molding method is provided that comprises a curing step of heating the molding die together with the viscous material filled therein, thereby curing and molding the viscous material.

Further, according to the first aspect of the present invention, it is an injection molding apparatus for injecting and molding a longitudinal product using a viscous material as a raw material.
Includes moldings having molds 1 and 2 and gas vents formed in at least one of the first and second molds.
The first and second molds jointly define a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The gas vent is closed to at least one of the first and second molds extending in a direction containing a component parallel to the longitudinal direction of the cavity at a position away from the mating surface of the mating mold. An injection molding apparatus is provided that is formed continuously or intermittently along a line.

Further, according to the second aspect of the present invention, it is an injection molding method for injecting a longitudinal product using a viscous material which is a thermosetting synthetic resin as a raw material.
A plug mounting step of mounting a plug that fits in a through hole formed in at least one of the first mold and the second mold forming a molding mold having a longitudinal cavity in a non-airtight state, and
The clamping process for clamping the first mold and the second mold, and
The viscous material is injected into the cavity from the upstream port of the cavity while degassing by a gas vent formed by fitting the plug into the through hole in a non-airtight state, thereby making the cavity viscous. The filling process of filling with material and
A curing step of heating the molding die together with the viscous material filled therein without pressurization, thereby curing and molding the viscous material.
Provided is an injection molding method including a step of releasing the clamp to separate the molding die after curing the viscous material and taking out the longitudinal product from the molding die.

According to the present invention, the following aspects can be obtained. Each aspect is divided into sections, each section is numbered, and if necessary, the numbers of other sections are cited. This is to facilitate understanding of some of the technical features that can be adopted by the present invention and combinations thereof, and the technical features that can be adopted by the present invention and combinations thereof are limited to the following aspects. Should not be interpreted as. That is, it should be interpreted that it is not hindered from appropriately extracting and adopting the technical features described in the present specification as the technical features of the present invention, which are not described in the following aspects.

Furthermore, describing each section in the form of quoting the numbers of the other sections does not necessarily prevent the technical features described in each section from being separated and independent from the technical features described in the other sections. It does not mean, and it should be interpreted that the technical features described in each section can be made independent as appropriate according to their properties.

(1) An injection molding apparatus for injecting a longitudinal product using a viscous material as a raw material.
Including a molding that defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold has an injection inlet for the viscous material at one end of the cavity and an injection outlet at the other end, whereby the viscous material moves in the cavity from the upstream mold toward the downstream side. It is possible to flow in the length direction of the cavity,
The molding has a gas vent that allows the gas in the cavity and the gas in the viscous material to be naturally discharged and degassed as the viscous material advances in the cavity.
The gas vent penetrates the mold in the thickness direction so as to communicate with each other in the internal space and the external space of the cavity, and is continuous in the direction containing components parallel to the length direction of the mold. It extends intermittently or intermittently
The gas vent has a shape through which the gas passes, but the viscous material does not pass due to flow resistance based on its viscosity, whereby the gas vent is injection molded to perform filtering in addition to degassing. apparatus.

(2) The gas vent is formed by a gap between a plurality of members of the molding die or a slit or a row of through holes integrally formed in the molding die.
Item (1): The gap, the slit or the row of through holes extends from a position equal to or close to the injection inlet to a position equal to or close to the injection outlet in the plan view of the molding mold. The injection molding apparatus according to.

(3) The gap, slit or through hole row is a cross section formed as a closed continuous line or an intermittent line that surrounds the injection inlet and the injection outlet together in a plan view of the molding mold, and the thickness of the molding mold. The injection molding apparatus according to item (2) extending in the longitudinal direction.

(4) The closed continuous line or intermittent line surrounds a pair of straight lines extending in a direction including a component parallel to the length direction of the molding mold, and the injection inlet and the injection outlet, respectively, from the outside. The injection molding apparatus according to item (3), which has a pair of curved portions.

(5) The gap, slit or through hole row is a cross section formed as a closed continuous line or an intermittent line surrounding the injection inlet and the injection outlet together in a plan view of the molding mold, and the thickness of the molding mold. It extends in the vertical direction
The closed continuous line or intermittent line is a pair of straight lines extending in a direction including a component parallel to the length direction of the molding mold, and a pair of curves surrounding the injection inlet and the injection outlet from the outside, respectively. Has a part and
The injection molding apparatus according to item (4), wherein the gap, the slit or the row of through holes comes into contact with the raw material in a state where the cavity is completely filled or partially filled with the raw material.

(6) The molding mold has a first mold and a second mold that switch between a state of being separated from each other and a state of being engaged with each other, and the first mold and the second mold are jointly used with each other to form the cavity. Define and
At least one of the first mold and the second mold has a main body having a through hole having a long hole cross section extending in the length direction of the molding mold in a plan view of the molding mold, and the through hole is airtight. It is divided into a long cross-section plug that fits in the absence
The injection molding according to any one of (1) to (5), wherein at least a part of the gap between the main body and the plug functions as the gas vent in the assembled state of the main body and the plug. apparatus.

(7) The injection molding apparatus according to item (6), wherein the injection inlet and the injection outlet are respectively arranged at both ends in the length direction of the plug.

(8) The molding mold has a first mold and a second mold that switch between a state of being separated from each other and a state of being engaged with each other, and the first mold and the second mold are jointly used with each other to form the cavity. Define and
At least one of the first type and the second type is divided into at least two parts.
In the assembled state of these two parts, at least a part of the gap between the two parts extends in the length direction of the molding die.
The injection molding apparatus according to any one of (1) to (7), wherein at least a part of the gap functions as the gas vent.

(9) The product has a notch in at least one cross section in the length direction thereof.
The injection molding apparatus according to any one of (1) to (8), wherein the molding die has a portion for forming the notch portion.

(10) The notch extends in the length direction of the product, and in the notch, the product is attached to a continuously extending edge of the structure according to item (9). The injection molding apparatus described.

(11) The product has a cavity extending in the length direction at least in one place in the length direction thereof.
The injection molding apparatus according to any one of (1) to (10), wherein the molding die has a core for forming the cavity.

(12) The injection molding apparatus according to item (11), wherein a plurality of the cores are arranged in a row so as to separate a gap from each other.

(13) The molding molds have a first mold and a second mold that switch between a state of being separated from each other and a state of being engaged with each other, and the first mold and the second mold are jointly used with each other to form the cavity. Define and
The injection molding device according to any one of (1) to (12), further comprising a clamping device that clamps the first and second molds in a state of being fitted to each other.

(14) An injection molding apparatus for injecting a longitudinal product using a viscous material as a raw material.
Including a molding that defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold has an injection inlet for the viscous material at one end of the cavity and an injection outlet at the other end, whereby the viscous material moves through the cavity from the upstream side to the downstream side. It is possible to flow in the length direction of the cavity,
The molding die is an injection molding apparatus in which the upstream side of the raw material flow is arranged diagonally or vertically with a posture higher than the downstream side or the upstream side of the raw material flow lower than the downstream side.

(15) The molding has a gas vent that allows the gas in the cavity and the gas in the viscous material to be naturally discharged and degassed as the viscous material advances in the cavity. And
The injection molding apparatus according to item (14), wherein the gas vent is installed on the upper surface or the lower surface of the cavity.

(16) An injection molding method for injecting a longitudinal product using a viscous material which is a thermosetting synthetic resin as a raw material.
A clamping process for clamping the first and second molds constituting a molding mold having a longitudinal cavity, and
The viscous material is injected into the cavity from the upstream port of the cavity while spontaneously degassing with the molded gas vent without forcible pressurization or depressurization, thereby causing the cavity to be viscous. The filling process of filling with material and
A curing step of heating the molding die together with the viscous material filled therein without pressurization, thereby curing and molding the viscous material.
An injection molding method including a step of releasing the clamp, separating the molding die, and taking out the longitudinal product from the molding die after the viscous material is cured.

(17) A sealing method in which a gap formed between two plate members that are overlapped with each other is filled with a sealing material.
The process of preparing the premold sealant and
A step of mounting the prepared premold sealing material on one of the two plate members, which is a longitudinal edge extending generally parallel to the gap, with the gap exposed. When,
A sealing method comprising the step of applying a liquid sealing material to the exposed gap in a state of at least partially covering the mounted premold sealing material.

(18) An injection molding apparatus for injecting a longitudinal or non-longitudinal product using a viscous material as a raw material.
Includes molding molds that define longitudinal or non-longitudinal cavities that have a shape that reflects the target shape of the product.
The mold is an injection molding apparatus having a gas vent that allows the gas in the cavity and the gas in the viscous material to be naturally discharged and degassed as the viscous material flows through the cavity. ..

(19) An injection molding apparatus for injecting a longitudinal or non-longitudinal product using a viscous material as a raw material.
Includes molding molds that define longitudinal or non-longitudinal cavities that have a shape that reflects the target shape of the product.
The molding die is an injection molding apparatus having a swirl-imparting portion that imparts swirl to the flow of the viscous material when the viscous material is injected into the cavity.

FIG. 1 is a perspective view showing a molding die of an injection molding apparatus according to an exemplary embodiment of the present invention in an exploded state. FIG. 2 is a perspective view showing an example of a product manufactured by the molding die shown in FIG. 3 (a), 3 (b), 3 (c) and 3 (d) are premolded sealants for the products to illustrate some use cases of the products shown in FIG. It is a perspective view for demonstrating the sealing method which performs the sealing work by using as. FIG. 4 is a perspective view showing an example of the internal shape of the product shown in FIG. 5 (a) is a sectional view taken along the line AA in FIG. 4, and FIG. 5 (b) is a sectional view taken along the line BB in FIG. FIG. 6 is a front sectional view showing the injection molding apparatus having the molding mold and the clamping apparatus shown in FIG. FIG. 7 is a bottom view showing the injection molding apparatus shown in FIG. FIG. 8 is a side sectional view showing the molding die shown in FIG. 1 in an exploded state. FIG. 9 is an enlarged front sectional view showing the molding die shown in FIG. 8 in a state where the inner portion thereof is not attached to the second mold having the outer portion and the inner portion. FIG. 10 is a plan view showing the second type shown in FIG. 8 taken out. FIG. 11 is an enlarged side sectional view showing a part of the second mold shown in FIG. 8 in a state where the core is assembled to the second mold. 12 (a) is an enlarged perspective view of the core shown in FIG. 11, FIG. 12 (b) is a side view showing the core, and FIG. 12 (c) is the core. It is a front view which shows. 13 (a) is a sectional view taken along the line CC in FIG. 8, and FIG. 13 (b) is a sectional view taken along the line DD in FIG. FIG. 14 is a perspective view showing a state in which the molding die shown in FIG. 1 is used in a different arrangement from that of FIG.

Hereinafter, some of the exemplary embodiments of the present invention will be described in detail with reference to the drawings.

First, an injection molding apparatus according to an exemplary embodiment of the present invention will be described, then a longitudinal product injection molding method using the injection molding apparatus will be described, and further, the molded longitudinal product will be pre-prepared. The sealing method used as a mold sealing material will be described.

<Overall configuration of injection molding equipment>

FIG. 1 shows an exploded perspective view of an injection molding apparatus 10 according to an embodiment of the present invention. The injection molding device 10 is an device for injection molding a longitudinal product 12 using a viscous material which is a thermosetting synthetic resin (for example, a filling-modified polysulfide resin) as a raw material (for example, a material to be molded). .. However, as a raw material, a material other than a thermosetting synthetic resin to which a curing agent is added may be used.

In this document, the term "longitudinal" is interpreted to include a rod-like shape, a shape in which the vertical dimension of the product is longer than the horizontal dimension (for example, an oval shape or a rectangular shape in a lateral view). Rectangle.

The raw material has fluidity before being injected into the injection molding apparatus 10 and does not show a remarkable shape of itself. Therefore, the device that performs compression molding in which the material has a certain shape before being put into the molding die and the material is compressed to form a target shape is different from the injection molding device 10.

FIG. 2 shows an example of the product 12 in a perspective view. The product 12 generally extends straight with a circular cross section, but each cross section has a fan-shaped portion with a right-angled central angle (instead, the central angle is a small angle even if it is larger than a right angle. It may have a cut-out shape. That is, the product 12 has a notch portion 14 having a fan shape of 90 degrees.

Thus, the product 12 has a notch 14 at least one cross section in the length direction thereof. Therefore, for example, as will be described later with reference to FIG. 13, the injection molding apparatus 10 has a portion (triangular cross-sectional portion 160 described later) for forming the notch portion 14.

The notch 14 extends in the length direction of the product 12. In one use example, as shown in FIG. 3, in the notch 14, the product 12 is attached to a continuously extending edge 18 of a structural material (metal, synthetic resin, etc.) 16. ..

Specifically, as shown in FIG. 3, an example of the use of this product 12 is a premold sealing material. For example, this product 12 is attached / fixed to an edge 18 having a corner having a 90-degree cross section in a structural material 16 such as a plate material or a block material by applying / interposing an adhesive from the outside. To. This sealing method will be described in detail later.

In FIG. 4, the product 12 is more specifically shown in a perspective view. As shown in FIG. 4, in the product 12, a plurality of cavities 20 are arranged in a row at the center of the notch portion 14 with a gap between them. As shown in FIG. 5A, each cavity 20 has a cylindrical shape extending concentrically with the central portion of the product 12.

FIG. 5A shows a cross section of a certain portion (AA cross-sectional view in FIG. 4) of the product 12 shown in FIG. 4 having a cavity 20 in the central portion. On the other hand, FIG. 5B shows a product 12 shown in FIG. 4, which is a cross section of another portion (cross-sectional view taken along the line BB in FIG. 4) and does not have a cavity 20 in the center. There is.

In FIG. 4, the plurality of cavities 20 can be used, for example, as pockets for pre-containing the adhesive.

In this use example, the adhesive is previously applied relatively thinly to the surface of the edge 18 of the structural material 16 by the operator, and in the product 12, it is applied relatively thinly to the surface of the notch portion 14. Not only that, the cavity 20 is filled in a relatively large amount in advance.

In this use case, the adhesive material is more flexible than the product 12 material (even if it is of the same quality as the adhesive material). Therefore, the adhesive is more compatible with the surface unevenness of the edge 18 than the product 12, and is also more compatible with the surface unevenness of the portion of the product 12 forming the cavity 20. As a result, the adhesive can exert an effective anchoring effect on both the product 12 and the edge 18.

After that, the product 12 is attached to the edge 18 of the structural member 16 by the operator. As a result, the adhesive is firmly adhered to both the product 12 and the edge 18 by an effective anchoring effect. As a result, the product 12 and the edge 18 are firmly adhered to each other through the adhesive.

As described above, the product 12 has a cavity 20 extending in the length direction at least in one place in the length direction thereof. Therefore, for example, as will be described later with reference to FIG. 8, the injection molding apparatus 10 has a portion (core 132) for forming the cavity 20.

In the example shown in FIG. 4, a plurality of cavities 20 are arranged in a row so as to separate each other from each other. Therefore, for example, as will be described later with reference to FIG. 8, a plurality of cores 132 are also arranged in a row so as to be separated from each other.

<Composition of molding mold>

As shown in FIG. 1, the injection molding apparatus 10 has a molding mold 30 having a longitudinal shape. In the present embodiment, the molding mold 30 is a split type, but may be an integral type.

The mold 30 has a first mold 40 and a second mold 42 that switch between a state of being separated from each other and a state of being engaged with each other. Both the first type 40 and the second type 42 are made of synthetic resin, and specifically, they are manufactured by using Teflon (registered trademark) or POM as a synthetic resin having high releasability. Both Type 1 40 and Type 2 42 are manufactured using Teflon (registered trademark) or a synthetic resin having a releasability of about POM.

As shown in FIG. 1, both the first type 40 and the second type 42 have a longitudinal shape extending along one straight line, but instead of this, for example, one arc or being connected to each other. It may form a longitudinal shape extending along a center line including a single curve composed of a plurality of arcs.

<Clamp device configuration>

As shown in the front sectional view of FIG. 6, the injection molding device 10 further has a clamping device 50 that clamps the first mold 40 and the second mold 42 in a state of being fitted to each other.

The clamp device 50 has a first clamper 52 that holds the first type 40 and a second clamper 54 that holds the second type 42. The first clamper 52 is a pair of side wall grooves 56, 56 of the first type 40 shown in FIG. 1 (each side wall groove 56 is, for example, a straight groove, but may be a non-straight groove, or may be a horizontal groove. , Non-horizontal groove is also possible). On the other hand, the second clamper 54 is a pair of side wall grooves 58, 58 of the second type 42 shown in FIG. 1 (each side wall groove 58 is, for example, a straight groove, but a non-straight groove may be used, or a horizontal groove. Yes, but non-horizontal grooves are also acceptable).

The first clamper 52 and the second clamper 54 engage with each other in a releaseable state. The first clamper 52 and the second clamper 54 are engaged with each other to switch between a mold clamping state in which the molding die 30 is closed and a mold opening state in which the molding die 30 is released from each other to release the molding die 30.

As shown in FIG. 6, an operation unit (for example, an operation lever 60) that can be operated by an operator in order to switch the cooperation state of the first clamper 52 and the second clamper 54 between the release state and the engagement state. At least one lock device 62 is provided.

FIG. 7 shows the bottom surface of the second clamper 54. A plurality (for example, five) of locking devices 62 are arranged substantially evenly on each of a pair of side surfaces extending in the longitudinal direction of the second clamper 54. Although not shown, similarly, a plurality of (for example, five) locking devices 62 are arranged substantially evenly on each of the pair of side surfaces extending in the longitudinal direction of the first clamper 52.

<Cavity configuration>

As shown in FIG. 1, both the first type 40 and the second type 42 form a longitudinal cavity 70 (see FIG. 6) having a shape reflecting the target shape of the product 12 in a state of being engaged with each other. To do. The first type 40 has a longitudinal first cavity 80, the second type 42 also has a longitudinal second cavity 82, and the first cavity 80 and the second cavity 82 are united. Cavity 70 is formed by

In the example shown in FIGS. 6, 9 and 13, both the first cavity 80 and the second cavity 82 have a shape extending straight in a semicircular cross section, and the first type 40 and the second type 42 are formed. In the state of being engaged with each other, the two semicircular cross sections are combined at each diameter to form one circular cross section, and as a result, the basic cross section of the cavity 70 becomes circular.

As shown in FIG. 1, the first type 40 and / or the second type 42 has an injection inlet 90 for a raw material at one end of the cavity 70 and an injection outlet 92 at the other end, whereby the raw material can be obtained. It is possible to flow in the cavity 70 from the upstream mold toward the downstream side in the length direction of the cavity 70.

To explain the definition of terms here, the "one end portion" and the "other end portion" are portions of the side surface of the cavity 70 adjacent to each end surface even when they mean each end surface of the cavity 70, respectively. It may mean each side surface end portion, or may mean a portion straddling each end surface and each side surface end portion.

The raw material is injected into the cavity 70 from the injection inlet 90. As the amount of raw material in the cavity 70 increases, pre-existing gas (eg, air) is pushed out of the cavity 70, and as a result, some of the excess gas is pushed out of the inlet 92.

The injection inlet 90 and the injection outlet 92 may both be formed in the first type 40, both may be formed in the second type 42, one may be formed in the first type 40, and the other may be formed in the second type. It may be formed into different molds such as 42.

In the example of the second type 42 shown in FIG. 1, the injection inlet 90 and the injection outlet 92 are both formed together in the second type 42. A plurality of (for example, two) conduits 94 (for example, flexible tubes and rigid pipes) are installed so as to communicate with the injection inlet 90 and the injection outlet 92, respectively. , Through a plurality of through holes 98, 98 (see FIG. 7) formed in the second clamper 54 holding the second type 42.

As shown in FIG. 1, the injection inlet 90 is arranged at a position as far as possible in the longitudinal direction from the center of the first cavity 80 of the first type 40 and / or the second cavity 82 of the second type 42. To. Similarly, the injection outlet 92 is also arranged at a position as far as possible in the longitudinal direction from the center of the first cavity 80 of the first type 40 and / or the second cavity 82 of the second type 42.

As a result, it is promoted that the raw material fills the inside of the cavity 70 from the upstream end to the downstream end without leakage and wets the entire surface of the cavity 70 without leakage.

<Injection of raw materials in swirl state>

Although not shown, in order for the raw material to smoothly pass through the conduit 94 narrower than the cavity 70, the conduit 94 (for example, injection) provides a swirl-imparting portion that imparts a swirl (transverse vortex around the traveling direction) to the raw material. It may be added to the inner peripheral surface of the conduit 94) for the inlet 90. One example of such a swirl imparting portion is a spiral groove formed on the inner peripheral surface of the conduit 94, and another example is an oblique guide plate installed on the inner peripheral surface of the conduit 94.

When the raw material is swirled and injected into the cavity 70, the raw material is filled into the cavity 70 more smoothly than when the raw material is not swirled (for example, linearly) and pushed into the cavity 70. As a result, since the raw material is forcibly pushed into the cavity 70, the raw material becomes turbulent, and the possibility that the raw material entrains the surrounding gas is reduced. As a result, it is possible to prevent gas from being mixed into the raw material that has been defoamed before injection when it is injected into the cavity 70.

<Detailed structure of molding mold>

FIG. 8 shows a side sectional view of the molding die 30 in a disassembled state. The first type 40 has a first cavity 80 extending in a cross section generally forming a semicircle, and the first cavity 80 is open on the side facing the second type 42. Of the first type 40, the surface facing the second type 42 is an elongated annular inner recess 100 that surrounds the opening surface of the first cavity 80 from the outside, and an elongated annular inner recess 100 that surrounds the inner recess 100 from the outside. It has an outer convex portion 102.

Similarly, the second mold 42 has a second cavity 82 extending in a generally semicircular cross section, the second cavity 82 opening on the side facing the first mold 40. Of the second type 42, the surface facing the first type 40 is an elongated annular inner convex portion 110 that surrounds the opening surface of the second cavity 82 from the outside, and an elongated inner convex portion 110 that surrounds the inner convex portion 110 from the outside. It has an annular outer recess 112.

As shown in FIG. 6, in a state where the first mold 40 and the second mold 42 are engaged with each other (molding state), the inner concave portion 100 of the first mold 40 is partially formed on the inner convex portion 110 of the second mold 42. On the other hand, the outer convex portion 102 of the first mold 40 is close to the outer concave portion 112 of the second mold 42, but does not come into contact.

Therefore, the first type 40 and the second type 42 are engaged with each other by partial contact between the inner concave portion 100 and the inner convex portion 110, and at this time, the mating surface of the first type 40 is of the inner concave portion 100. , The surface of the portion that partially contacts the inner convex portion 110, while the mating surface of the second type 42 is the surface of the portion of the inner convex portion 110 that partially contacts the inner concave portion 100.

The mating surface of the first mold 40 and the mating surface of the second mold 42 coincide with each other in a state where the first mold 40 and the second mold 42 are engaged with each other. At this time, the center point of the semicircular cross section of the first cavity 80 is located on the mating surface of the first mold 40, and at the same time, the center point of the semicircular cross section of the second cavity 82 is located on the mating surface of the second mold 42. Moreover, the center point of the semicircular cross section of the first cavity 80 and the center point of the semicircular cross section of the second cavity 82 coincide with each other. The position of the matching center point coincides with the center point of the circular cross section which is the basic cross section of the cavity 70.

As described above, the mating surface of the first mold 40 and the mating surface of the second mold 42 are not in close contact with each other in a wide area, but in a narrow area and the synthetic resin parts are in contact with each other. Sometimes they are in contact with each other, leaving a normal gap between them.

Specifically, the inner concave portion 100 of the first mold 40 has a horizontal flat surface facing the second mold 42, while the inner convex portion 110 of the second mold 42 is horizontal facing the first mold 40. It has an uneven surface.

The uneven surface includes an inner annular protrusion 120 having a horizontal and flat top surface on the innermost side, an annular groove portion 122 having an inverted triangular cross section recessed on a steep slope on the outside thereof, and an annular groove portion 122 having an inverted triangular cross section on the outer side thereof. It has an outer annular projection 124 having a horizontal and flat top surface that is higher than the bottommost position of the annular groove 122 but lower than the top surface of the inner annular projection 120. The height difference between the top surface of the inner annular protrusion 120 and the top surface of the outer annular protrusion 124 is d1 (for example, about 0.5 mm) larger than 0.

As shown in FIGS. 8 and 9, the height difference d1 exists in an annular shape so as to surround the entire outer circumference of the cavity 70. The width dimension of the top surface of the inner annular protrusion 120 can be the same as, smaller, or larger than the width dimension of the top surface of the outer annular protrusion 124.

<Structure of the first gas vent>

The second type 42 has a gap G1 (for example, about 0 mm-about 0.1 mm) that is stronger than other parts and smaller than other parts in the inner concave portion 100 of the first type 40 in the inner annular protrusion 120. Contact.

However, in the contact state, the gas in the cavity 70 can naturally leak to the outside from the gap G1 between the inner annular protrusion 120 of the second type 42 and the inner recess 100 of the first type 40. However, since the gap G1 of the raw material in the cavity 70 is small with respect to its viscous resistance, it is impossible for the raw material to leak to the outside through the gap G1.

The gap G1 is a synthetic resin material having Teflon (registered trademark) or a mechanical property equivalent thereto and acting as a rigid body (that is, the inner annular protrusion 120 of the second type 42 and the inner recess of the first type 40). This is a gap generated when the planes of 100) come into contact with each other.

Here, for example, the surfaces of the inner annular protrusion 120 of the second type 42 and the inner recess 100 of the first type 40 are the surfaces of the portions forming the cavity 70 in the first type 40 and the second type 42, respectively. Has a coarser surface roughness. For example, the surface of the cavity 70 has a micromirror finish, whereas the surfaces of the inner annular protrusion 120 of the second mold 42 and the inner recess 100 of the first mold 40 have a normal finish.

Therefore, the surfaces of the inner annular protrusion 120 of the second mold 42 and the inner recess 100 of the first mold 40 each have fine irregularities, so that even if the size of the gap G1 is set on the design drawing. Even if it is 0 mm, a gap G1 is realized in which the gas is permeated but the viscous material is not permeated.

Therefore, the gap G1 between the inner annular protrusion 120 of the second type 42 and the inner recess 100 of the first type 40 functions as the gas vent (first gas vent) for degassing and filtering. The gap G1 exists in an annular shape on the mold matching surface of the first mold 40 and the second mold 42 so as to surround the entire outer circumference of the cavity 70.

<Detailed structure of type 2>

As shown in FIG. 8, the first mold 40 is composed of one component, while the second mold 42 is composed of a main body 130 and a plurality of cores 132, and the main body 130 is outside. It is divided into a portion 134 and an inner portion 136.

As shown in FIGS. 8 and 10, the outer portion 134 has a longitudinal through hole 138 extending in its length direction (in plan view, it coincides with the small inner peripheral surface 140 shown in FIG. 13). An example of the longitudinal through hole 138 extends along the longitudinal centerline of the outer portion 134. The longitudinal through hole 138 can be formed as an elongated elongated hole in its plan view.

As shown in FIG. 8, the longitudinal through hole 138 of the outer portion 134 has a stepped and elongated inner peripheral surface, and specifically, the inner peripheral surface thereof is on the upper side (close to the first type 40). On the side), the elongated small inner peripheral surface 140 (corresponding to the longitudinal through hole 138 shown in FIG. 10 in the plan view) and the lower side (the side far from the first type 40) in the plan view. It is composed of an elongated large inner peripheral surface 142. The inner portion 136 is fitted into the longitudinal through hole 138.

As shown in FIG. 8, the inner portion 136 also has a stepped and elongated outer peripheral surface in the same manner, and specifically, the outer peripheral surface is on the upper side (the side close to the first type 40) in a plan view. It is composed of an elongated small outer peripheral surface 150 and a large elongated outer peripheral surface 152 on the lower side (the side far from the first type 40) in a plan view.

As shown in FIG. 6, in the assembled state (fitting state) of the outer portion 134 and the inner portion 136, the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 are fitted to each other. At the same time, the large inner peripheral surface 142 of the outer portion 134 and the large outer peripheral surface 152 of the inner portion 136 are fitted to each other.

In the fitted state, the shoulder surface 144 between the small inner peripheral surface 140 and the large inner peripheral surface 142 of the outer portion 134, and the small outer peripheral surface 150 and the large outer peripheral surface 152 of the inner portion 136. The shoulder surfaces 154 in between engage with each other. The shoulder surfaces 144 and 154 define the access limit between the outer portion 134 and the inner portion 136.

<Structure of second gas vent>

However, as shown in FIGS. 8 and 13, the large inner peripheral surface 142 of the outer portion 134 and the large outer peripheral surface 152 of the inner portion 136 are fitted to each other in a gap d2 (for example, about 1 mm). On the other hand, the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 are fitted to each other with a gap G2 narrower than the gap d2 (for example, about 0.1-about 0.2 mm on the design drawing). It fits.

It is clear that the gas in the cavity 70 can naturally leak to the outside through the gap d2 between the large inner peripheral surface 142 of the outer portion 134 and the large outer peripheral surface 152 of the inner portion 136. However, the gas in the cavity 70 can naturally leak to the outside from the gap G2 between the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136.

However, since the gap G2 between the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 is located upstream of the gap d2 and narrower than the gap d2, the cavity G2 allows the cavity. Leakage of the raw material in 70 is prevented. This is because the size of the gap G2 is so small that even if the raw material tries to pass through the gap G2 while the raw material is viscous, the passage is hindered by the viscous resistance.

Therefore, the gap G2 between the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 also functions as the gas vent (second gas vent) for degassing and filtering.

In the present embodiment, the outer portion 134 constitutes an example of the "main body portion", and the inner portion 136 constitutes an example of the "plug".

The gap G2 is shown in FIG. 10 as an elongated hole indicating a longitudinal through hole 138. As described above, the gap G2 has a length dimension that generally covers the entire length dimension of the cavity 70, and one generatrix of the cavity 70 (for example, in a plan view, the axial center line of the cavity 70 is It has a shape that extends in a ring shape so as to generally surround the entire projected generatrix).

The length dimension of the gap G2 at least partially coincides with the length dimension of the longitudinal through hole 138 shown in FIG. The length dimension of the gap G2 is longer than 50%, more preferably more than 60%, more preferably longer than 70%, more preferably longer than 80%, and more than 50% of the length dimension of the second mold 42. More preferably, it is longer than 90%.

In the present embodiment, the gap G2 extends continuously (without interruption) in the length direction of the molding die 30, but instead, the gap G2 is intermittently arranged (the gap and the actual portion are alternately arranged). It is possible to carry out the present invention in an extended manner.

Further, in the present embodiment, the gap G2 makes two members separating the two members, that is, the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 at right angles to the respective surfaces. It is formed by separating them from each other in various directions. However, in a replacement and / or additionally, at least one of the small inner peripheral surface 140 of the outer portion 134 and the small outer peripheral surface 150 of the inner portion 136 is uneven (for example, a plurality of hemispherical recesses and / or A gap G2 may be realized by providing a plurality of hemispherical convex portions).

Further, in the present embodiment, as shown in FIGS. 8 and 10, two straight portions 156 and 157 of the oval gap G2 connect the injection inlet 90 and the injection outlet 92 at the shortest distance. It covers the entire longitudinal area. As a result, the length dimension of the first gas vent is maximized, whereby the degassing performance can be easily maximized.

Specifically, the gap G2 is a closed continuous line (also an intermittent line) that surrounds the injection inlet 90 and the injection outlet 92 together in the second type 42 (which may be additionally or optionally the first type 40). Good) is formed. The closed continuous line consists of a pair of straight lines 156,157 extending in a direction substantially parallel to the length direction of the second type 42, and a pair of injecting inlets 90 and injecting outlets 92, respectively, from the outside. It has curved portions (for example, a pair of semicircular portions) 158 and 159.

Further, in the present embodiment, the gap G2 exists only in the second type 42, but it may also exist in the first type 40, or a plurality of gaps G2 may exist in the same type. ..

Further, in the present embodiment, the pair of straight portions 156 and 157 of the gap G2 extend in a direction substantially parallel to the length direction of the molding die 30, but in one modification, The pair of straight portions 156, 157 may extend in a direction diagonally intersecting the length direction of the molding die 30.

In this modification, the length dimension of the gap G2 is longer than when the pair of straight portions 156, 157 extend in a direction substantially parallel to the length direction of the molding die 30, and the raw material is the injection inlet 90. The degassing effect due to the gap G2 is improved when flowing from the to the injection port 92.

Further, in the present embodiment, the pair of curved portions 158 and 159 of the gap G2 are substantially aligned with the upstream end of the cavity 70 at the injection inlet 90 and the downstream end of the cavity 70. The injection outlets 92 arranged at the same positions are arranged in close proximity to each other so as to surround them.

Therefore, according to the present embodiment, immediately after the raw material is injected into the cavity 70, the degassing of the raw material by the gap G2 is started, and the degassing causes the raw material to reach the injection port 92 of the cavity 70 or This is continued until a slight discharge from the inlet 92.

As described above, the raw material can continuously experience the degassing effect due to the gap G2 while flowing from the injection inlet 90 to the injection outlet 92.

Further, in the present embodiment, the second gas vent is formed as a gap G2 between the outer portion 134 and the inner portion 136, which are two independent parts constituting the second type 42.

However, in substitution and / or additionally, through a slit or a plurality of through holes that penetrate one mold in the thickness direction of the first mold 40 and / or the second mold 42 without straddling the two molds. The through-hole row may be formed so as to have a shape that the viscous material does not pass through, and the gas vent may be formed by the slits or the through-hole row.

<Structure of core in molding mold>

As shown in FIG. 8, a plurality of cores 132 are attached to the inner portion 136. As shown in FIG. 12, each core 132 extends generally straight in a circular cross section, and both ends thereof have a convex shape flattened from the hemispherical shape, but may have a hemispherical shape. ..

The core 132 has a streamlined shape with respect to the flow of the raw material (particularly, the flow from the upstream to the downstream) in the installed state in the cavity 70, and when the raw material flows in the cavity 70. The possibility that the gas in the cavity 70 is mixed into the raw material due to the generation of stagnation, vortices, etc. behind the core 132 is reduced.

As shown in FIG. 8, the inner portion 136 extends in the length direction, and in the length direction, the cross section shown in FIG. 13 (a) (the cross section of the portion to which the core 132 is mounted) and FIG. 13 The cross section shown in (b) (the cross section of the portion where the core 132 is not mounted) is alternately repeated. The cross section shown in FIG. 13 (a) forms the portion shown in FIG. 5 (a) of the product 12, while the cross section shown in FIG. 13 (b) forms the portion of the product 12 in FIG. The portion shown in (b) is formed.

As shown in the front sectional view of FIG. 13B, the portion of the inner portion 136 to which the core 132 is not attached has an apex at the position of the center point of the semicircular cross section of the second cavity 82 and has a apex. A parallel cross section having a triangular cross section 160 having an angle of 90 degrees, an outer surface of the triangular cross section 160 and a surface of the second cavity 82 extending downward from a position where they engage with each other, and having a pair of side surfaces parallel to each other. It has a part 162 and.

On the other hand, as shown in the side sectional view of FIG. 11 and the front sectional view of FIG. 13A, each portion of the inner portion 136 to which each core 132 is mounted is from the triangular cross-sectional portion 160. It has a quasi-trapezoidal cross-sectional portion 164 formed by cutting off the tip portion, and a parallel cross-sectional portion 162. The tip surface of the quasi-trapezoidal cross section 164 has a concave shape that fits the bottom surface of the corresponding core 132.

As shown in the side sectional view of FIG. 11, each portion of the inner portion 136 to which each core 132 is mounted has a stepped bolt through hole that simultaneously penetrates the quasi-trapezoidal cross-sectional portion 164 and the parallel cross-sectional portion 162. It has 166. The bolt through hole 166 communicates the internal space and the external space of the cavity 70 with each other. The bolt through hole 166 is a stepped hole, and has a large diameter hole 170 on the outside and a small diameter hole 172 on the inside. A shoulder surface 174 is provided between the large-diameter holes 170 and the small-diameter holes 172.

A bolt 176 having a head is inserted into the bolt through hole 166. The insertion is performed until the head of the bolt 176 comes into contact with the shoulder surface 174. The tip of the shaft portion of the bolt 176 penetrates the bolt through hole 166 inward, is exposed from the inner surface of the inner portion 136, and faces the internal space of the cavity 70. The corresponding core 132 (female threaded portion) is screwed into the exposed portion (male threaded portion) of the bolt 176. The core 132 is fixed to the inner portion 136 by the bolt 176.

As shown in FIG. 8, an injection inlet 90 and an injection outlet 92 are formed at both ends in the length direction of the inner portion 136 of the second type 42, respectively. The injection inlet 90 and the injection outlet 92 communicate the internal space and the external space of the cavity 70 with each other.

As described above, the inner portion 136 forms an injection inlet 90 and an injection outlet 92, a function of contributing to the formation of the second gas vent, a function of enabling the core 132 to be installed, and an injection outlet 92, although they are one component. It realizes both of the functions of doing.

Further, in the present embodiment, each core 132 realizes both a function of forming a cavity 20 in the product 12 and a function of contributing to the formation of the third gas vent, even though each core 132 is one component. doing.

<Structure of third gas vent>

There is a gap G3 between the outer surface of the core 132 in contact with each other and the surface of the inner portion 136, and further, there is a gap G4 between the outer surface of the bolt 176 and the inner surface of the bolt through hole 166. The two gaps G3 and G4 communicate with each other, so that the two gaps G3 and G4 communicate with each other the internal space and the external space of the cavity 70. The two gaps G3 and G4 also cooperate with each other to form a third gas vent.

Therefore, in the present embodiment, the first gas vent is present in the mold matching portion between the first type 40 and the second type 42, and further, the outer portion 134 and the inner portion 136 of the second type 42. The second gas vent is present between them, and further, the third gas vent is present between the inner portion 136, the plurality of cores 132, and the plurality of bolts 176.

<Arrangement of molding mold>

<Horizontal arrangement>

As shown in FIGS. 1 and 14, in one example, the mold 30 is arranged horizontally. In one example, as shown in FIG. 1, the first type 40 is arranged on the upper side and the second type 42 is arranged on the lower side. In another example, as shown in FIG. 14, on the contrary, the first type 40 is arranged on the lower side and the second type 42 is arranged on the upper side.

In the arrangement shown in FIG. 1, the second gas vent (gap G2) and the injection inlet 90 and the injection outlet 92 are arranged on the lower surface of the cavity 70. Therefore, when the raw material is injected from the injection inlet 90 against gravity, the raw material is gradually deposited on the lower surface of the cavity 70.

Therefore, when the raw material is injected, the raw material is divided and scattered in the cavity 70 and entrains the gas in the cavity 70, and as a result, the probability that the gas is mixed in the raw material is low.

When the raw material is further injected, there is a high probability that the raw material will flow downstream along the lower surface of the cavity 70 while in contact with the gap G2. Even if the raw material comes into contact with the gap G2, the raw material is prevented from leaking from the gap G2.

On the other hand, in the arrangement shown in FIG. 14, the second gas vent (gap G2) and the injection inlet 90 and the injection outlet 92 are arranged on the upper surface of the cavity 70. Therefore, when the raw material is injected from the injection inlet 90 according to gravity, the raw material falls on the lower surface of the cavity 70.

When the raw material is further injected, the raw material tends to flow downstream along the lower surface of the cavity 70 with almost no contact with the gap G2. Therefore, since the raw material hardly contacts the gap G2 until the cavity 70 is almost completely filled with the raw material, there is a probability that each part of the gap G2 is completely clogged by the raw material and degassing becomes impossible. , Lower than the probability in the case of the arrangement shown in FIG.

As a result, the gap G2 can exert the degassing effect for a long time. Even if the raw material comes into contact with the gap G2, the raw material is prevented from leaking from the gap G2.

The arrangement shown in FIG. 14 can be changed so that the injection inlet 90 is installed not in the upper mold 2nd mold 42 but in the lower mold 1st mold 40.

According to this modification, the probability that the raw material falls on the lower surface of the cavity 70 during injection and the gas is mixed into the raw material is reduced, and the raw material in the cavity 70 comes into contact with the second gas vent. It also reduces the probability that each part of the gas vent will be completely clogged by the raw material, making degassing impossible.

In this modification, the raw material tends to concentrate in the lower space of the cavity 70, while the gas in the cavity 70 and the gas in the raw material tend to concentrate in the upper space of the cavity 70.

As a result, according to this modification, the raw material and the gas tend to be sorted up and down in the cavity 70 by utilizing the difference in specific gravity, and thus the degassing effect of the second gas vent is improved.

<Inclined / vertical arrangement>

Unlike the examples shown in FIGS. 1 and 14, although not shown, in another example, the mold 30 is arranged diagonally or vertically.

In an example for realizing the arrangement, the upstream side (the side where the injection inlet 90 exists) of the raw material flow is arranged diagonally or vertically in a higher posture than the downstream side (the side where the injection outlet 92 exists). According to this arrangement, the raw materials are promoted to be deposited in the cavity 70 in order from the position near the injection port 92 (installed on the upper surface or the lower surface of the cavity 70). According to this inclined arrangement, even if the second gas vent is installed on the lower surface of the cavity 70, there is a probability that each part of the second gas vent is completely clogged by the raw material and degassing becomes impossible. Decreases.

In another example, conversely, the upstream side (the side where the injection inlet 90 exists) of the raw material flow is arranged diagonally or vertically in a lower posture than the downstream side (the side where the injection outlet 92 exists). According to this arrangement, the raw materials are promoted to be deposited in the cavity 70 in order from the position near the injection inlet 90 (installed on the upper surface or the lower surface of the cavity 70). According to this inclined arrangement, even if the second gas vent is installed on the lower surface of the cavity 70, there is a probability that each part of the second gas vent is completely clogged by the raw material and degassing becomes impossible. Decreases.

<Longitudinal product injection molding method using injection molding equipment>

The injection molding apparatus 10 described above is used for injection molding a longitudinal product 12, for example, as follows.

Clamping process

The operator engages the first type 40 and the second type 42 with each other, and in that state, engages the second clamper 54 with the first clamper 52. After that, the operator operates the operating lever 60 to clamp the first mold 40 and the second mold 42 to each other.

Filling process

The operator injects the raw material into the cavity 70 from the injection inlet 90, which is the upstream port of the cavity 70, without forcibly pressurizing or depressurizing, and as a result, the space in the cavity 70 gradually increases from the upstream side. Is filled with raw materials.

In the filling process, the three gas vents (combination of G1, G2 and G3 and G4) of the molding die 30 allow natural degassing (gas is naturally discharged from the cavity 70) and filtering (gas is allowed to pass through). Is not passed through viscous material).

As a result, the gas previously retained in the cavity 70 is discharged from the above-mentioned three gas vents (mainly, the second gas vent) and the injection outlet 92 as the raw material is injected. At the same time, the gas previously mixed in the raw material is also discharged from the above-mentioned three gas vents (mainly, the second gas vent) and the injection port 92. As a result, the raw material is also defoamed.

However, in order to effectively perform degassing while injecting the raw material, the raw material may be pressurized and pushed into the cavity 70, or the cavity 7 may be depressurized and the raw material may be drawn into the cavity 70.

Curing process

The operator heats the mold 30 together with the raw material filled therein (under atmospheric pressure) without pressurizing, thereby curing and molding the raw material.

However, in order to cure the raw material, it is not essential to heat the raw material, and the raw material may be cured at room temperature.

Extraction process

After the raw material is cured, the operator releases the clamp device 50 to separate the first mold 40 and the second mold 42 of the molding die 30 from each other, and takes out the product 12 from the molding die 30.

In the exemplary injection molding method described above, all the steps are manually performed by an operator, but all or part of these steps may be automatically performed by a machine.

As is clear from the above description, according to the injection molding apparatus and injection molding method according to the present embodiment, the viscous material having fluidity tends to flow in one direction in the cavity, and the viscous material becomes unnecessarily in the cavity. The tendency to divide becomes weaker. Therefore, the possibility that a plurality of portions separated from the viscous material collide in the cavity and the gas in the cavity is mixed in the viscous material is reduced.

Further, according to the present embodiment, thanks to the air vent, not only the gas in the cavity but also the gas previously mixed in the viscous material is discharged to the outside of the cavity, whereby the viscous material can be defoamed. It becomes.

Further, according to the present embodiment, since the air vent is arranged along the flow of the viscous material in the cavity, the gas previously mixed in the viscous material is more effectively discharged to the outside of the cavity, thereby. Defoaming of viscous materials can be effectively realized.

Further, according to the present embodiment, since the raw material injected into the cavity is a viscous material, gaps, slits or through holes are provided in the molding die, and the dimensions of these elements are set to the viscous resistance of the viscous material. If properly set in consideration, a degassing function and a filtering function that allows gas to pass through but does not allow viscous material to pass through are realized without indispensable dependence on a filter as a separate component.

<Seal method using a long product as a premold sealant>

The longitudinal product 12 produced in this way is used as a premold sealing material, for example, as follows in order to perform a sealing operation. However, this product 12 can be used for purposes other than sealing work, such as being used as a final product as it is.

Premold / sealing material preparation process

The worker positions the premolded sealing material 12 at a planned sealing part such as a longitudinal target part of the structure 16 (a seam of the structure 16 or the like, or an edge 18 of the structure). The adhesive is applied to the surface of a portion to be mounted (another associated site). In some cases, the operator also applies the adhesive to the target site.

When the length of one premolded sealant 12 after molding is longer than the length of the target site this time, the operator adjusts to the length of the target site this time (for example, the target site this time). The premold sealant 12 is cut so as to have a length not exceeding the length of the premold sealant 12.

Premold / sealing material addition process

When it is not possible to cover the entire target portion of the present time with only one premold sealing material 12, the operator also appropriately cuts and prepares another premold sealing material 12.

Premold / sealing material shape correction process

Since the premold sealant 12 has flexibility, even if the target portion of this time has a curved portion, the premold sealant 12 will cause excessive wrinkles unless the curved portion is bent tightly. It is possible to fit the target site this time without generating it.

However, when the curved portion of the target portion of this time is tightly bent, the operator corresponds to the curved portion of the target portion of the premold sealing material 12 prior to mounting on the target portion of this time. It is possible to make some cuts or slits in the portions using a cutter, thereby increasing the flexibility of the premold sealant 12.

Premold / sealing material mounting process

After that, as shown in FIG. 3A, the operator positions and adheres one or more premolded sealants 12 to the target portion of this time. As a result, one or more premolded sealants 12 are permanently fixed to the target site this time, mainly by the adhesive.

As described above, the premolded sealing material 12 has a notch portion 14, and the partner to which the notch portion 14 is mounted is an edge 18 having a shape that complements the notch portion 14. Therefore, the operator can accurately position the premold sealing material 12 with respect to the target portion of this time by a simple operation of aligning the notch portion 14 and the edge 18 with each other.

Liquid sealant coating process

After that, as shown in FIGS. 3 (b), (c) or (d), the operator fills the gap (seam, joint, etc.) 190 between the mating surfaces of the two members 16 and 17 of the structure. Therefore, substantially the same material as the premold sealing material 12 is used as the liquid sealing material 200, and a coating gun (not shown) is used to apply the material to the gap 190 between the two members 16 and 17. As a result, the final seals 210 and 212 are formed as a combination of the premold sealing material 12 and the liquid sealing material 200.

The coating gun is loaded with a cartridge (not shown) prefilled with the liquid sealant 200. The coating gun pushes the liquid sealant 200 with respect to the target portion by a required amount by driving the cartridge with a high-pressure source or a motor.

For example, as shown in FIGS. 3 (b), (c) or (d), when two structural members 16 and 17 are overlapped, the joint of the structural members 16 and 17, that is, the joint, that is, Fillet seals 210 and 212 are formed in the gap 190.

As a result, in the example shown in FIG. 3C, the fillet seal 210 having a flat diagonal outer surface is formed by combining the premold sealing material 12 and the liquid sealing material 200, and the gap between the two members 16 and 17 is formed. Formed at 190. In this case, of the premolded sealing material 12 and the liquid sealing material 200, it is the liquid sealing material 200 that directly fills the gap 190.

Instead of this, in the example shown in FIG. 3D, the premold sealing material 12 has a shape that is expanded in the radial direction by the combination of the premold sealing material 12 and the liquid sealing material 200. A fillet seal 212 having an outwardly convex curved outer surface is formed in the gap 190 between the two members 16 and 17. In this case, of the premolded sealing material 12 and the liquid sealing material 200, it is the liquid sealing material 200 that directly fills the gap 190.

In the example shown in FIGS. 3 (b), (c) or (d), the sealing work by the operator is performed by the prior installation of the premold sealing material 12 and the subsequent application of the liquid sealing material 200. It is composed. As a result, the final cross sections of the seals 210 and 212 are a combination of the cross section of the premold sealing material 12 and the cross section of the liquid sealing material 200.

The portion of the cross section of the final seals 210, 212 covered by the cross section of the premold sealant 12 includes the cross section of the portion of the premold sealant 12 deposited on the upper surface of the structural plate 16. There is. This cross section is a raised portion on the upper surface of the structural plate 16 and is a portion that is easily drooped. Therefore, in order for the operator to shape the raised portion with the coating gun, careful work is required, and it takes more time and effort than other portions.

On the other hand, according to the example shown in FIGS. 3B, 3C or 3D, the portion of the liquid sealing material 200 where it is difficult to shape the sealing material is preformed as the premolded sealing material 12. Therefore, instead of this, the workers can obtain the seals 210 and 212 having a cross-sectional shape with higher accuracy than when the worker applies the liquid sealant 200 to the structures 16 and 17 from the beginning, and the worker. The burden on is reduced.

Further, according to the example shown in FIGS. 3 (b), 3 (c) or (d), the above is performed with higher accuracy than when the operator applies the liquid sealant 200 to the structures 16 and 17 from the beginning. The coating gun is positioned with respect to the target sites of the structures 16 and 17, thereby facilitating stabilization of sealing performance.

This is because, in the example shown in FIGS. 3 (b), (c) or (d), the operator is positioned with respect to the structures 16 and 17 with relatively high accuracy and is pre-installed in advance. -The liquid sealing material 200 can be applied to the structures 16 and 17 with the sealing material 12 as a visual reference position, and as a result, the position where the liquid sealing material 200 is actually applied and the accuracy of the cross-sectional shape are improved. This is because the quality of the final seals 210, 212 positions and cross-sectional shapes is improved.

Here, as the quality of the cross-sectional shape, for example, the height dimension of the seal (for example, the seal height protruding from the upper surface of the upper structural member 16) and the width dimension of the seal (for example, the surface of the upper structural material 16 are covered. The seal length, the seal length covering the surface of the lower structural material 17), the throat thickness of the seal, and the like.

That is, in the fillet sealing work this time, the application of the liquid sealing material 200 is an important process in which the liquid sealing material 200 itself has high flexibility and therefore has a high fit to the mating member. Prior to the application of the liquid sealing material 200, the pre-applying material has a lower flexibility than the liquid sealing material 200 but a higher accuracy of the cross-sectional shape than the liquid sealing material 200 in order to stabilize the actual application position and the cross-sectional shape. The mold sealant 12 is used.

By the way, instead of the example shown in FIGS. 3B, 3C or 3D, the premolded sealant 12 is manufactured from the beginning so as to have the same cross section as the final seals 210 and 212. The sealing work may be carried out in such an manner.

According to this aspect, since the application of the liquid sealing material 200 is omitted, the sealing operation is simplified from the respective examples shown in FIGS. 3 (c) and 3 (d).

However, when the complete premold sealant 12 is used for the target sites of the structures 16 and 17 from the beginning, it is unavoidable that the structures 16 and 17 have dimensional variations, and the final result. There is a concern that an unplanned gap may exist between the target seal and the structures 16 and 17, and that the final seal may be unplannedly peeled off from the structures 16 and 17.

On the other hand, in the example shown in FIGS. 3B, 3C or 3D, the cross sections of the final seals 210 and 212 are the cross section of the premolded sealing material 12 and the cross section of the liquid sealing material 200. The liquid sealant 200 is liquid while operating the coating gun well so that the shape of the liquid sealant 200 matches the actual dimensions and shapes of the structures 16 and 17 and the surface unevenness. It is possible to apply the sealant 200.

Since the liquid sealant 200 is more flexible than the premolded sealant 12, it easily fits the surface irregularities of the structures 16 and 17, and as a result, the liquid sealant 200 is effective against the surface irregularities. Can exert an anchoring effect. Therefore, the liquid sealing material 200 is firmly fixed to the surfaces of the structures 16 and 17.

Therefore, according to the example shown in FIGS. 3 (b), (c) or (d), there is a concern that an unplanned gap may exist between the final seals 210 and 212 and the structures 16 and 17. And the concern that the final seals 210 and 212 will unplannedly peel off from the structures 16 and 17 can only be eliminated.

As described above, some of the exemplary embodiments of the present invention have been described in detail with reference to the drawings, but these are examples, and those skilled in the art, including the embodiments described in the [Summary of Invention] column. It is possible to carry out the present invention in other forms with various modifications and improvements based on knowledge.

Claims (2)

An injection molding device that injects and molds longitudinal products using a viscous material as a raw material.
Including a molding that defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold is
An injection inlet of the viscous material formed at one end of the cavity and
An injection port of the viscous material formed at the other end of the cavity,
An injection molding device that includes a gas vent that generally extends linearly between the injection inlet and the injection outlet. It is an injection molding method in which a longitudinal product is injection-molded from a viscous material which is a thermosetting synthetic resin using a molding mold.
The molding mold defines a longitudinal cavity having a shape that reflects the target shape of the longitudinal product.
The molding mold is
An injection inlet of the viscous material formed at one end of the cavity and
An injection port of the viscous material formed at the other end of the cavity,
Includes gas vents that generally extend linearly between the inlet and outlet.
In the injection molding method, the viscous material is injected into the cavity from the injection inlet of the cavity while degassing using the injection outlet and the gas vent, whereby the cavity is made of the viscous material. Filling process and filling process
An injection molding method comprising a curing step of heating the molding die together with the viscous material filled therein and thereby curing and molding the viscous material.

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