JP2000343570A - Resin part molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce molding cost by suppressing the size increase of a nest to reduce the restriction of the shape of a molded part and suppressing the size increase of an ejector plate to prevent the interference with other structure. SOLUTION: A molding apparatus is equipped with a fixed mold 3, a core mold 5 forming a body part molding cavity CM for molding the body part WM of a resin part W along with the fixed mold 3, a nest 6 forming an protruding part molding cavity CS for molding the protruding part WS of the resin part along with the core mold 5, the ejector plate 7 approaching the core mold and separating therefrom and the rod 8 positioned between the ejector plate 7 and the core to separate the nest 6 from the core mold in such a state that the ejector plate 7 approaches the core mold 5. A rod driving mechanism 10 revolving the rod 8 in the direction separating the nest 6 from the protruding part WS in such a stage that the nest 6 is separated from the core mold 5 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding resin parts used for molding resin parts.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for molding a resin component as described above, for example, there has been one shown in FIGS.

As shown in FIG. 4, a molding device 50 for a resin part comprises a fixed mold 52 installed on a base 51, a movable mold 53 provided to be able to approach and separate from the fixed mold 52, and a movable mold 53. A core mold 54 that is provided at 53 and forms a main body part forming cavity cm for molding a main body part wm of the resin component w with the fixed mold 52 in a state of being close to the fixed mold 52.
And the core mold 54 and the fixed mold 52 together with the main mold 54 to form a main body part molding cavity cm, and to protrude from the core mold 54 in a direction substantially orthogonal to the mold release direction (vertical direction in the drawing) of the resin component wm. An insert 55 is provided to form an overhanging part forming cavity cs for forming the part ws.

[0004] In addition, this resin part molding apparatus 50 includes:
The core mold 54 is housed above the core mold 54 of the movable mold 53 and
An ejector plate 56 which can be approached and separated from the rod 5 and a rod 5 having one end supported by the ejector plate 56 and the other end fixed to the insert 55 and inclined with respect to the releasing direction.
7 and a rod holder 58 provided on the core mold 54 for slidably supporting an intermediate portion of the rod 57. One end of the rod 57 is connected to the ejector plate 56 so as to be orthogonal to the releasing direction. A slider 59 that is movable in the direction is provided.

In this resin part molding apparatus 50, FIG.
As shown in FIG. 5, at the stage where the movable mold 53 is raised after the molding is completed to separate the core mold 54 from the fixed mold 52, the ejector plate 56 is moved closer to the core mold 54, and the slider 59 is moved to the left in the drawing. The rod 57 is pushed down, and the insert 55 fixed to the other end of the rod 57 is
From the core mold 54 to release the resin component w from the core mold 54.
After the mold release, the ejector plate 56 is
, The rod 57 is slid to the left in the drawing while being pushed down, to separate the insert 55 from the overhang portion ws of the resin component w.

[0006]

However, in the above-mentioned conventional resin component molding apparatus 50, the insert 55 is obliquely disengaged from the core mold 54 toward the fixed mold 52. Since the angle of inclination of the split surface 55a of the insert 55 with respect to the core mold 54 is inevitably greater than the draft angle of the normal insert, the insert 55 becomes larger by that amount and the resin component w overhangs. When the insert 55 is slid when separated from the portion ws, the protrusion wp as shown by the imaginary line in FIG. 4 cannot be arranged, that is, the shape of the molded part is severely restricted. There was a problem.

Further, in the conventional resin component molding apparatus 50, since the rod 57 is inclined with respect to the releasing direction, a moving path of the slider 59 having a long stroke must be secured in the ejector plate 56. However, as a result, there is a problem that the ejector plate 56 becomes large, and in addition, there is a measure for preventing the ejector plate 56 from interfering with other structures as the ejector plate 56 becomes large. There was a problem that had to be taken.

Further, in the conventional resin component molding apparatus 50, as described above, the split surface 55a
Of the insert 55 is large because the inclination angle of the
Has to be performed on the core mold 54 corresponding to the above, there is a problem that the molding cost is increased by that amount, and it has been a conventional problem to solve these problems. .

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made to increase the size of a nest for molding a resin part having a projecting portion in a direction substantially perpendicular to the releasing direction. To reduce the restrictions on the shape of the molded part, and also suppress the enlargement of the ejector plate,
Provided is a resin component molding apparatus capable of eliminating a measure for preventing an ejector plate from interfering with another structure, and reducing the molding cost. It is intended to be.

[0010]

According to the first aspect of the present invention, a main body of a resin part is formed between a fixed mold and a fixed mold provided so as to be able to approach and separate from the fixed mold. A protruding portion in a direction substantially perpendicular to the mold release direction of the resin part between the core mold forming the main body molding cavity and the core mold and the fixed mold together with the main mold forming cavity and the core mold. , An ejector plate positioned opposite to the fixed mold of the core mold so as to be able to approach and separate from the core mold, one end of which is supported by the ejector plate and the nest is formed. The other end is fixed to the ejector plate in a state in which the ejector plate is close to the core mold, and the nest is released from the core mold toward the fixed mold. At the stage where the nest comes close to the core mold and separates from the core mold toward the fixed mold, the rod is rotatable in the direction in which the nest is released from the overhang of the resin part. The configuration of the apparatus for molding a resin part is used as means for solving the above-described conventional problems.

According to a second aspect of the present invention, there is provided a main part forming cavity for molding a main part of a resin component between a fixed die and a fixed die provided so as to be able to approach and separate from the fixed die. Forming a main part molding cavity between a core mold to be formed and a fixed mold together with the core mold, and forming a projecting part between the core mold and the core mold in a direction substantially perpendicular to the mold release direction of the resin component. A nest forming a cavity, an ejector plate positioned opposite to the fixed mold of the core mold and capable of approaching and separating from the core mold, one end of which is supported by the ejector plate and the other end of which is fixed to the nest. In a resin part molding apparatus provided with a rod for releasing the insert from the core mold toward the fixed mold while the ejector plate is close to the core mold, the ejector plate approaches the core mold. When the insert is released from the core mold toward the fixed mold, a rod drive mechanism for rotating the rod in a direction in which the insert is released from the overhang of the resin component is provided. Is a means for solving the above-mentioned conventional problems.

According to a third aspect of the present invention, the rod driving mechanism is provided on the ejector plate so as to be movable in a direction orthogonal to the releasing direction, and rotatably supports one end of the rod. Slider, a slider pressing means for pressing the slider in a direction perpendicular to the releasing direction when the insert is disengaged from the core mold toward the fixed mold, and a middle part of the rod provided on the core mold so as to be slidable. And a self-aligning bearing which becomes the center of rotation of the rod when the slider is pressed in a direction perpendicular to the releasing direction.

According to a fourth aspect of the present invention, the slider pressing means of the rod driving mechanism has one link rotatably connected to the ejector plate and the other link rotatably connected to the slider. The link part is connected to the core type while being bent toward the core type, and the link part is rotatably connected to the core type. When the ejector plate comes closer to the core mold, the link comes into contact with the bent link at the stage where the link is disengaged, and the link is pressed at the stage where the link is bent further when the ejector plate further approaches the core mold. In the apparatus for molding a resin part according to claim 5 of the present invention, the slider pressing means of the rod driving mechanism is configured such that the ejector plate has a core. A configuration that includes a cam that presses the slider in a direction perpendicular to the releasing direction when the ejector plate further approaches the core mold from the stage where the nest comes away from the core mold toward the fixed mold approaching to the core mold. I have.

According to a sixth aspect of the present invention, there is provided an apparatus for molding a resin part, wherein a return means is provided for returning the slider, which is moved by being pressed by the slider pressing means of the rod driving mechanism, to its original position.

[0015]

The resin component molding apparatus according to the first and second aspects of the present invention has the above-described configuration.
If the rod is rotated with the ejector plate approaching the core mold and the nest being disengaged from the core mold toward the fixed mold, the nest moves in the direction of releasing from the overhang of the resin part. It will be.

That is, since it is not necessary to incline the rod in advance with respect to the releasing direction between the fixed mold and the core mold, the inclination angle of the dividing surface with respect to the core mold of the nest is set to the normal draft angle of the nest. Degree, that is, it is possible to avoid an increase in nesting, and as a result,
There are few restrictions on the shape of the molded part.

Further, since the rod does not have to be tilted in advance with respect to the releasing direction, there is no need to secure a large space for moving the end of the rod on the ejector plate. This makes it possible to prevent the plate from increasing in size, thereby reducing the need to take measures to avoid interference between the ejector plate and other structures.

Further, as described above, the inclination angle of the divided surface with respect to the core mold of the nest can be set to the same degree as the draft angle of the normal nest, so that the inclined surface forming process is not performed on the core mold. As a result, the molding cost can be reduced.

In the apparatus for molding a resin part according to a third aspect of the present invention, since the above configuration is adopted, the nest is released from the core mold and the nest is released from the overhang portion after the nest is released from the core mold. In this case, the movement in the direction to be performed is smoothly performed without any trouble.

In the apparatus for molding a resin part according to a fourth aspect of the present invention, the link part on the ejector plate is provided until the insert is separated from the core mold toward the fixed mold. The ejector plate does not interfere with the abutment portion of the core mold at all, so that the approaching operation of the ejector plate toward the core mold can be smoothly performed without a load. Since the molding apparatus has the above-described configuration, the structure for rotating the rod after the insert is separated from the core mold toward the fixed mold can be simplified.

According to the resin component molding apparatus of the present invention, when the ejector plate is separated from the core mold, the slider is automatically returned to the original position and the rod and the insertion member are moved. The child returns to the original state along the mold releasing direction, and the operation of returning the child to the core mold is performed quickly without any trouble, thereby improving the working efficiency.

[0022]

According to the resin component molding apparatus of the first and second aspects of the present invention, since the above-described configuration is employed, the inclination angle of the divided surface of the insert with respect to the core mold is reduced by the ordinary insert draft. Degree, i.e., it is possible to avoid an increase in the size of the nesting, and thus to reduce the restriction on the shape of the molded part. Since it is not necessary to secure a large space for moving the parts, it is possible to prevent the ejector plate from being enlarged,
This has a remarkably excellent effect that it is possible to almost eliminate interference points between the ejector plate and other structures, and furthermore, it is also possible to reduce the molding cost.

In the apparatus for molding a resin part according to a third aspect of the present invention, since the above configuration is adopted, the nest is released from the core mold and the nest is projected from the overhang portion after the nest is released from the core mold. A remarkably excellent effect that the release can be smoothly performed without any trouble is brought about.

In the apparatus for molding a resin part according to the fourth aspect of the present invention, the ejector plate can be smoothly approached to the core mold of the ejector plate without any load because of the above-mentioned configuration. The resin component molding apparatus according to claim 5 has the above-described configuration, so that the structure for rotating the rod can be simplified, and the resin component molding apparatus according to claim 6 of the present invention can be simplified. With the above-described configuration, a remarkably excellent effect that improvement in working efficiency can be realized is brought about.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of an apparatus for molding a resin part according to the present invention.

As shown in FIG. 1, the resin component molding apparatus 1 includes a fixed die 3 installed on a base 2, a movable die 4 provided to be able to approach and separate from the fixed die 3, and a movable die 4 and a core mold 5 forming a body part molding cavity CM for molding the body part WM of the resin component W with the fixed mold 3 in a state close to the fixed mold 3, and fixed together with the core mold 5. The main body portion molding cavity CM is formed with the mold 3 and the projecting portion WS in a direction substantially perpendicular to the mold release direction (vertical direction in the drawing) of the resin component WM between the mold cavity and the core mold 5.
Is provided with an insert 6 for forming an overhanging part forming cavity CS for forming the protrusion.

The resin component molding apparatus 1 includes an ejector plate 7 housed in a plate housing chamber 4a provided above the core mold 5 of the movable mold 4 and capable of approaching and separating from the core mold 5; Is supported by the ejector plate 7 and the other end is fixed to the insert 6 so that the ejector plate 7
Is provided with a rod 8 for detaching the insert 6 from the core mold 5 toward the fixed mold 3 in a state close to the core mold 5.
At the stage where the ejector plate 7 approaches the core mold 5 and the nest 6 separates from the core mold 5 toward the fixed mold 3, the rod 8 moves in the direction in which the nest 6 separates from the overhang portion WS of the resin component W. Is provided with a rod drive mechanism 10 for rotating the.

The rod driving mechanism 10 is provided on the ejector plate 7 so as to be movable in a direction perpendicular to the releasing direction, and a slider 11 for rotatably supporting one end of the rod 8.
And a slider pressing means 20 for pressing the slider 11 in a direction orthogonal to the releasing direction when the insert 6 is separated from the core mold 5 toward the fixed mold 3, and a rod 8 provided on the upper part of the core mold 5. Slidably supports an intermediate portion of the
1 is provided with a spherical bearing (self-aligning type bearing) 12 which becomes the center of rotation of the rod 8 when it is pressed in a direction perpendicular to the releasing direction.

In this case, as shown in FIG. 2, the slider pressing means 20 of the rod driving mechanism 10 is connected to one of the links 21 and the slider 11 having one end rotatably connected to a base 7a provided on the ejector plate 7. A link portion 23 rotatably connected to each other with the other end of the other link 22 rotatably connected to the core mold 5 being bent toward the core mold 5. When the ejector plate 7 is provided close to the core mold and the insert 6 separates from the core mold 5 toward the fixed mold 3, the ejector plate 7 comes into contact with the bent connecting portion 23 a of the link portion 23 and the ejector plate 7 is 5, the linking portion 23a of the link portion 23 is pressed at the stage where the link portion 23 is further approached.
Is provided with an abutting pin (abutting portion) 24 which is substantially linear.

A return force for returning the slider 11 of the rod drive mechanism 10 to the original position is applied to the ejector plate 7, that is, the two links 21 of the link portion 23 are provided.
A compression spring (return means) 9 for applying a force in a direction to bend the slider 22 to the slider 11 is provided.

When the resin part W molded by the resin part molding apparatus 1 is released from the molding apparatus 1, first, the movable mold 4 in the closed state shown in FIG. The mold 5 is separated from the fixed mold 3 to open the mold.

Next, the ejector plate 7 is made to approach the core mold 5, and the rod 8, one end of which is supported by the slider 11 of the rod drive mechanism 10, is pushed straight down along the release direction, and The fixed insert 6 is released from the core mold 5 toward the fixed mold 3.

Subsequently, the ejector plate 7 is connected to the core mold 5.
When the nest 6 is separated from the core mold 5, the abutment pin 24, which has been in contact with the connecting portion 23 a of the link portion 23 when the insert 6 is separated from the core die 5, as shown in FIG. Since the connecting portion 23a is more strongly pressed to make the two links 21 and 22 substantially linear, the slider 11 of the rod drive mechanism 10 moves rightward in the figure.

At this time, since the intermediate portion of the rod 8 is slidably supported by the spherical bearing 12 of the self-centering type, the rod 8 rotates clockwise around the spherical bearing 12 in the drawing. As a result, the insert 6 moves to the left side in the figure and is released from the overhang portion WS of the resin component W.

Therefore, the resin component molding apparatus 1
Since the rod 8 does not need to be tilted in advance with respect to the direction in which the fixed mold 3 and the core mold 5 are separated, the inclination angle of the split surface 6a of the insert 6 with respect to the core mold 5 is set to the normal insert angle. Can be suppressed to about the draft angle, that is,
It is possible to avoid an increase in the size of the insert 6, and as a result, the shape of the molded component W is less restricted.

Further, since the rod 8 does not need to be tilted in advance with respect to the releasing direction, it is not necessary to secure a large space for moving the slider 11 on the ejector plate 7. Accordingly, it is possible to prevent the ejector plate 7 from interfering with other structures.

Furthermore, since the inclination angle of the divided surface 6a of the insert 6 with respect to the core mold 5 can be set to a value equal to the draft angle of the ordinary insert, it is not necessary to perform an inclined surface forming process on the core mold 5. As a result, the molding cost can be reduced.

Further, the resin component molding apparatus 1
Since the rod drive mechanism 10 employs the above-described configuration, the insertion member 6 is separated from the core mold 5, and after the insertion member 6 is separated from the core mold 5, the insertion member 6 is separated from the projecting portion WS of the insertion member 6 in the direction of releasing. The movement is smoothly performed without any hindrance. In addition, since the slider pressing means 20 of the rod drive mechanism 10 is composed of the link portion 23 and the butting pin 24, the insert 6 is moved from the core mold 5 Fixed type 3
The link 23 on the ejector plate 7 does not interfere with the butting pin 24 of the core mold 5 at all until the ejector plate 7 is disengaged. The operation is performed smoothly without any load.

Further, the resin component molding apparatus 1
Then, the rod drive mechanism 10 is placed on the ejector plate 7.
The slider 11 is automatically returned to the original position when the ejector plate 7 is separated from the core mold 5 and raised when the ejector plate 7 is lifted up. As a result, the rod 8 and the insert 6 return to the original state along the release direction, and the return operation of the insert 6 to the core mold 5 is quickly performed without any trouble.
Work efficiency will be improved.

FIG. 3 shows another embodiment of the apparatus for molding a resin part according to the present invention. As shown partially in FIG. Is different from the resin part molding apparatus 1 in that the slider pressing means 40 of the rod drive mechanism 10 is provided in a state of being suspended from the movable mold 4 and has a slider position holding portion 41a which is provided along the releasing direction at the upper part. A cam 41 having a slider pressing portion 41b whose lower portion is inclined with respect to the releasing direction;
The cam follower 42 provided on the slider 11 is provided, and the other configuration is the same as the resin component molding apparatus 1 according to the previous embodiment.

In the slider pressing means 40 of the rod drive mechanism 10 in the molding device 31, the cam is kept until the ejector plate 7 approaches the core mold 5 and the insert 6 is separated from the core mold 5 toward the fixed mold 3. At the stage where the slider 11 is held by the slider position holding portion 41a of 41 and the ejector plate 7 further comes closer to the core mold 5 from the stage when the insert 6 is separated from the core mold 5, the slider pressing portion 41b of the cam 41 is The slider 11 is pressed to the left in the figure via the cam follower 42.

In the resin part forming apparatus 31, as in the resin part forming apparatus 1 according to the previous embodiment, the insert 6
In addition, it is possible to avoid any increase in the size of the ejector plate 7, to reduce the molding cost and to improve the working efficiency. In addition, by using the above-described configuration for the slider pressing means 40 of the rod drive mechanism 10, The structure for rotating the rod 8 after the insert 6 is detached from the core mold 5 toward the fixed mold 3 is simplified.

The detailed configuration of the apparatus for molding a resin part according to the present invention is not limited to the above embodiment.

[Brief description of the drawings]

FIG. 1 is an explanatory vertical cross-sectional view of an embodiment of an apparatus for molding a resin part according to the present invention in a mold closed state.

FIG. 2 is an explanatory longitudinal sectional view showing a state of taking out a resin part in a mold open state of the resin part molding apparatus in FIG. 1;

FIG. 3 is an explanatory view showing an operation state of a slider pressing means when a resin part is taken out, showing another embodiment of a resin part molding apparatus according to the present invention.

FIG. 4 is an explanatory vertical cross-sectional view of a conventional resin component molding apparatus in a mold closed state.

FIG. 5 is an explanatory longitudinal sectional view showing a state of taking out the resin part in a mold open state of the resin part molding apparatus in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Molding apparatus of resin parts 3 Fixed mold 5 Core mold 6 Insert 7 Ejector plate 8 Rod 9 Compression spring (return means) 10 Rod drive mechanism 11 Slider 12 Spherical bearing (self-aligning type bearing) 20, 40 Slider Pressing means 21 One link 22 The other link 23 Link part 23a Connecting part 24 Butting pin (butting part) 41 Cam CM Main part forming cavity CS Overhang part forming cavity W Resin part WM Body part of resin part WS Resin Overhanging parts

Claims (6)

[Claims] 1. A fixed mold, a core mold which is provided so as to be able to approach and separate from the fixed mold and forms a body portion molding cavity for molding a body portion of a resin component between the fixed mold and the core mold. An insert forming a projecting portion forming cavity for forming a projecting portion in a direction substantially orthogonal to a mold releasing direction of a resin component between the core portion and a main body forming cavity with the fixed mold; and a core. An ejector plate which is located on the side opposite to the fixed mold and which can be approached to and separated from the core mold, and one end is supported by the ejector plate and the other end is fixed to the nest, so that the ejector plate approaches the core mold. In a resin component molding device equipped with a rod that separates the insert from the core mold toward the fixed mold in the state, the ejector plate approaches the core mold and the insert moves from the core mold to the fixed mold. A molding device for a resin part, wherein the rod is rotatable in a direction in which the nest is released from the overhang portion of the resin part at the stage of detachment. 2. A fixed mold, a core mold provided so as to be able to approach and separate from the fixed mold and forming a body portion molding cavity for molding a body portion of the resin component between the fixed mold and the core mold. An insert forming a projecting portion forming cavity for forming a projecting portion in a direction substantially orthogonal to a mold releasing direction of a resin component between the core portion and a main body forming cavity with the fixed mold; and a core. An ejector plate which is located on the opposite side of the fixed mold so as to be able to approach / separate from the core mold, and one end is supported by the ejector plate and the other end is fixed to the nest, and the ejector plate approaches the core mold. In a resin component molding device equipped with a rod that separates the insert from the core mold toward the fixed mold in the state, the ejector plate approaches the core mold and the insert moves from the core mold to the fixed mold. A resin component molding device, comprising: a rod drive mechanism for rotating a rod in a direction in which a nest is released from a protruding portion of the resin component at the stage of detachment. 3. A rod driving mechanism is provided on an ejector plate so as to be movable in a direction orthogonal to a releasing direction, and a slider for rotatably supporting one end of a rod, and an insert is directed from a core type to a fixed type. A slider pressing means for pressing the slider in a direction perpendicular to the releasing direction when the slider is released, and a slidably supporting intermediate portion of the rod provided on the core mold and allowing the slider to move in a direction perpendicular to the releasing direction. The resin part molding apparatus according to claim 2, further comprising a self-centering type bearing which becomes a center of rotation of the rod when pressed. 4. The slider pressing means of the rod driving mechanism,
A link portion rotatably connected to one of the links rotatably connected to the ejector plate and the other link rotatably connected to the slider while being bent toward each other toward the core type; When the ejector plate is provided on the mold and the ejector plate approaches the core mold and the nest is released from the core mold toward the fixed mold, the ejector plate comes into contact with the bent connecting portion of the link portion and the ejector plate further approaches the core mold 4. The resin part molding apparatus according to claim 3, further comprising an abutting portion which presses a bent connecting portion of the link portion to make both links substantially linear. 5. The slider driving means of the rod driving mechanism,
Equipped with a cam that presses the slider in a direction perpendicular to the mold release direction when the ejector plate further approaches the core mold from the stage where the ejector plate approaches the core mold and the nest separates from the core mold toward the fixed mold. The resin part molding apparatus according to claim 3, wherein: 6. The resin part molding apparatus according to claim 3, further comprising a return means for returning the slider, which is moved by being pressed by the slider pressing means of the rod drive mechanism, to its original position.