JP2002283410A - Valve gate type mold assembly and molding method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of abrasion in a valve pin or a gate when a gate is opened in the inclined surface inclined in a mold on-off direction of a product cavity. SOLUTION: The valve pin 61 is moved linearly to be fitted in a gate 42 in a freely datachable manner to open and close the gate 42. The moving direction C of the valve pin 61 is allowed to be almost right-angled to the inclined surface 33a, in which the gate 42 is opened, of the product cavity 33. By this constitution, the pressure of the molding material charged in the product cavity 33 acts on the valve pin 61 in its axial direction but not in its diameter direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve gate type mold apparatus used for injection molding of a thermoplastic resin or the like, and a molding method using the same.

[0002]

SUMMARY OF THE INVENTION In a hot runner mold apparatus for heating a resin as a molding material in a material passage to a gate to a product cavity and keeping the resin in a molten state at all times,
2. Description of the Related Art A valve gate type mold apparatus that mechanically opens and closes a gate with a valve pin serving as a valve body is known. The hot runner mold device aims at increasing the molding efficiency, and the reason why the gate is closed is to prevent the resin from leaking from the gate when the mold is opened.

Here, a product (molded product) as shown in FIG.
Consider molding 1. The product 1, together has a body portion 2 of cylindrical shape and has a tapered portion 3 at one end of the main body portion 2.

FIG. 4 shows an example of a valve gate type mold apparatus which can be used for molding the product 1. This valve gate type mold apparatus is a fixed mold which is a pair of mold bodies which move in the vertical direction in the figure (mold opening and closing direction A) to open and close.
The fixed mold 11 and the movable mold 12 form a product cavity 13 having the shape of the product 1 therebetween when the mold is closed. The product cavity 13 has the axial direction of the product 1 coincident with the mold opening / closing direction A, and the side having the tapered portion 3 is the fixed mold 11 side, particularly for convenience of releasing the product 1 from the mold. This is a general setting. The fixed mold 11 has a surface corresponding to the outer surface of the product 1 in the product cavity 13 formed by a fixed mold plate 14, and the movable mold 12 has a product 1 in the product cavity 13.
A surface corresponding to the inner surface is formed by the core 15.

[0005] The fixed mold 11 has a product cavity.
The hole-shaped gate 16 which is the entrance of the resin into the fixed mold plate 13
A valve device 17 for opening and closing the gate 16 is incorporated in the housing 14. This valve device 17
Has a substantially cylindrical valve casing 19 that is formed in the fixed-side mold plate 14 and is built into a mounting hole 18 that has the gate 16 at the tip. This valve casing 19
A material passage 21 that communicates with the product cavity 13 via the gate 16 is formed in the inside, and a heater 22 that heats the material passage 21 is provided on an outer peripheral portion. The gate 16 and the material passage 21 have the mold opening / closing direction A as an axial direction, and are opposed to each other. Further, in the valve casing 19, a substantially cylindrical valve pin 23 as a valve body also having the mold opening / closing direction A as an axial direction is provided. This valve pin 23
The gate 16 is opened / closed by being moved linearly in the axial direction by driving a hydraulic cylinder device or the like (not shown).
At the tip. In addition, not only the one shown in FIG. 4 but also the conventional valve gate type mold device, the axial direction of the valve pin coincides with the mold opening and closing direction.

[0006] At the time of molding, the fixed mold 11 and movable mold 12
After the product cavity 13 is formed between the fixed mold 11 and the movable mold 12, the valve pin 23 is moved in a direction away from the movable mold 12 to open the gate 16. Then, a molten thermoplastic resin as a thermoplastic molding material is injected into the fixed mold 11 from the injection molding machine. This resin flows from the gate 16 into the product cavity 13 through the material passage 21. After the resin has been filled in the mold cavity 13 this way, through the pressure holding valve pin 23 moves toward the movable mold 12, the gate gate closure portion 24 of the valve pin 23 is fitted into the gate 16 Close 16. After the resin in the product cavity 13 has cooled and solidified, the fixed mold 11 and the movable mold
The mold 12 is opened, and the resin in the product cavity 13, that is, the molded product 1 is taken out. Thereafter, the mold is closed again and the above molding cycle is repeated. However, the resin in the material passage 21 is always kept in a molten state by the heating of the heater 22 throughout the entire molding cycle.

In the case of the product 1 having the shape shown in FIG. 3, if the axial direction of the valve pin 23 coincides with the mold opening / closing direction A, the position where the gate 16 can be opened with respect to the product cavity 13 is a tapered portion. Only at the position corresponding to 3,
In this case, the surface of the product cavity 13 where the gate 16 is opened becomes an inclined surface 13a inclined with respect to the mold opening / closing direction A.

However, when the gate 16 is opened on the inclined surface 13a in the product cavity 13, the axial direction of the valve pin 23 coincides with the mold opening / closing direction A, so that the gate of the valve pin 23 forming the product cavity 13 is formed. Closed part 24
Must be inclined with respect to the axial direction of the valve pin 23. Therefore, the valve pin 23 must be accurately positioned with respect to the gate 16 in the circumferential direction (rotation direction), and the positioning of the valve pin 23 is troublesome.

The pressure of the resin filled in the product cavity 13 is controlled by a valve pin 23 forming the product cavity 13.
Acts in a direction B orthogonal to the tip surface 24a of the valve pin 23, but since this direction B does not coincide with the axial direction A of the valve pin 23, a force is also applied to the valve pin 23 in its radial direction. Direction A,
If the angle of difference B is within the range of about ± 5 °, valve pin
Although the force applied in the radial direction of 23 is small and does not cause much problem, in the case of the product 1 shown in the drawing, the angle α of the difference between the directions A and B (the tapered portion 3 with respect to a plane orthogonal to the mold opening / closing direction A).
Is substantially large, the force applied to the valve pin 23 in the radial direction is also considerably large. As a result, on the outer peripheral surface 25 of the tapered portion 3, the side surface of the gate closing portion 24 of the valve pin 23 is pressed against the side surface of the gate 16, and the gate closing portion 24 of the valve pin 23 or the side surface of the gate 16 is worn. It will be easier. Then, when the side surface of the gate closing portion 24 or the gate 16 of the valve pin 23 is worn, burrs are easily generated on the gate mark of the product 1.

The present invention is intended to solve such a problem. When the gate is opened on an inclined surface which is inclined with respect to the mold opening and closing direction in the product cavity, the valve body or the gate is worn. It is an object of the present invention to provide a valve-gate-type mold device capable of suppressing the occurrence of the problem and a molding method using the same.

[0011]

According to a first aspect of the present invention, there is provided a valve gate type mold apparatus, comprising: a pair of molds for opening and closing each other and forming a product cavity therebetween when the mold is closed. A valve device that opens and closes a gate that allows a material passage provided in the mold to communicate with the product cavity, wherein the gate has an inclined surface that is inclined with respect to the opening and closing direction of the molds in the product cavity. Opening,
The valve device is a valve gate type mold device that opens and closes the gate by removably fitting to the gate by linearly moving the valve body, wherein the moving direction of the valve body is in the product cavity. This is substantially perpendicular to the inclined surface where the gate is opened.

At the time of molding, a pair of molds are closed to form a product cavity between the molds, the valve body is pulled out of the gate and the gate is opened, and the material passage is molded into the product cavity through the gate. Fill the material. Next, the valve body of the valve device is fitted to the gate to close the gate, and after the molding material in the product cavity is solidified, the mold is opened to take out the molding material in the product cavity, that is, the molded product. Thereafter, the mold is closed again and the above molding cycle is repeated. The gate is open on an inclined surface that is inclined with respect to the opening and closing direction of the two molds in the product cavity, but is linearly moved so that it can be inserted into and removed from the gate to open and close the gate. Is substantially perpendicular to the inclined surface, the pressure of the molding material filled in the product cavity acts on the valve body in the moving direction, and does not act in other directions. That is, the pressure of the molding material in the product cavity does not act to increase the friction between the valve body and the side surface of the gate. As a result, wear of the valve body and the gate is suppressed. At the same time, even if the valve body rotates in the circumferential direction with respect to the gate, the surface of the product cavity formed by the valve body does not fluctuate.

According to a second aspect of the present invention, in the valve gate type mold apparatus according to the first aspect of the present invention, the tip end surface of the valve body forming a part of the inclined surface of the product cavity is moved in the moving direction of the valve body. Are almost orthogonal.

As described above, by making the moving direction of the valve body substantially perpendicular to the inclined surface of the product cavity,
The distal end surface of the valve body can also be substantially perpendicular to the direction of movement of the valve body, so that the pressure of the molding material in the product cavity acts on the valve body only in the direction of movement. Become.

According to a third aspect of the present invention, there is provided a molding method using a valve gate type mold apparatus, in order to achieve the above object, by closing a pair of molds which are opened and closed with each other and forming a product cavity between the molds. Forming and filling a molding material into the product cavity from a material passage provided in the mold via a gate opened on an inclined surface inclined with respect to the opening and closing direction of the molds in the product cavity; In the molding method in which the gate is closed by the valve body of the valve device except when the molding material is filled in the product cavity, the gate is opened and closed by being linearly moved to be removably fitted to the gate. The valve body is moved in a direction substantially perpendicular to an inclined surface of the product cavity where a gate is opened.

The gate is open on an inclined surface that is inclined with respect to the opening and closing direction of the two molds in the product cavity.
Since the moving direction of the valve body that opens and closes the gate by being linearly moved so as to be removably fitted to the gate and that opens and closes the gate is substantially orthogonal to the inclined surface, the product is filled into the product cavity. The material pressure acts on the valve body in the direction of its movement and not in the other direction. That is, the pressure of the molding material in the product cavity does not act to increase the friction between the valve body and the side surface of the gate. As a result, wear of the valve body and the gate is suppressed. At the same time, even if the valve body rotates in the circumferential direction with respect to the gate, the surface of the product cavity formed by the valve body does not fluctuate.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of a valve gate type mold apparatus of the present invention and a molding method using the same will be described.
This will be described with reference to FIGS. The product 1 to be molded is the one shown in FIG. 3 described above. First, the configuration of the valve gate type mold apparatus will be described.

Reference numeral 31 denotes a fixed mold, and 32 denotes a movable mold. The fixed mold 31 and the movable mold 32, which are molds, move in the vertical direction in the figure (mold opening / closing direction A) to open and close. A plurality of product cavities 33 having the shape of the product 1 are formed. In the product cavity 33, the axial direction of the product 1 is made to coincide with the mold opening / closing direction A, and the side having the tapered portion 3 is the fixed mold 31 side.

The fixed mold 31 includes a first fixed side mold plate 36,
The movable mold 32 of the first fixed mold plate 36 and a second fixed mold plate 37 fixed to a surface opposite to the movable mold 32 are provided. These fixed side mold plates 36 and 37 form a surface corresponding to the outer surface of the product 1 in the product cavity 33. Also, on the surface of the second fixed side mold plate 37 opposite to the movable mold 32,
The manifold 38 is fixed via a spacer (not shown). Further, although not shown, the surface of the manifold 38 on the side opposite to the movable mold 32 includes:
A fixed-side mounting plate fixed to a fixed-side platen of the injection molding machine is fixed. In the manifold 38,
A runner 39, which is a material passage for branching to a plurality of product cavities 33, is formed therein, and a heater (not shown) for heating the runner 39 is provided.

The second fixed mold plate 37 has a valve device mounting hole 41 formed therein. The distal end of the valve device installation hole 41 is a hole-shaped gate 42 that opens at a position corresponding to the tapered portion 3 of the product 1 in the product cavity 33. Therefore, product cavity 33
Is an inclined surface 33a which is inclined with respect to the mold opening / closing direction A. The valve device mounting hole 41 including the gate 42 has a substantially rotary body shape, and the axial direction C thereof is a direction orthogonal to the inclined surface 33a. Therefore, the axial direction C of the valve device installation hole 41 and the gate 42 is inclined with respect to the mold opening / closing direction A by an angle α equal to the inclination angle α of the inclined surface 33a with respect to a plane orthogonal to the mold opening / closing direction A.

A valve casing 44 of a valve device 43 for opening and closing the gate 42 is installed in the valve device installation hole 41. Next, this valve device
The configuration of 43 will be described. The valve casing 44
Has a substantially cylindrical shape with the direction C as an axial direction,
It has a flange 45 at one end. This flange part 45
Is fitted and fixed to one end of the valve device assembling hole 41, and a flat surface 46 orthogonal to the mold opening / closing direction A is formed in the upper part of the figure. The flat surface 46 is joined to the manifold 38.

A material passage 51 is formed in the valve casing 44 for connecting the runner 39 of the manifold 38 to the product cavity 33 through the gate 42. Most of the material passage 51 extends in the axial direction C of the valve casing 44 and coaxially faces the gate 42. One end of the material passage 51 is a bent portion 52, and
An opening is formed on a flat surface 46 of the hole 45. The bent portion 52 communicates with the runner 39. Also, valve casing
A heater 53 for heating the material passage 51 is provided on an outer peripheral surface of the 44, and a cylindrical heater cover 54 that covers the heater 53 from an outer peripheral side is provided. further,
A temperature sensor 55 is provided in the valve casing 44 along the inside of the heater 53. The distal end of the valve casing 44 on the gate 42 side is supported by being partially fitted into a fitting surface 56 formed in the valve device installation hole 44. In other parts, a gap is formed between the valve casing 44 or the heater cover 54 and the second fixed-side mold plate 37 for heat insulation. However, in order to prevent the temperature in the axial direction C central portion of the valve casing 44 from becoming excessively high, the heater cover 54
A heat-radiating projection 57 formed at the center in the axial direction of the outer peripheral surface is in contact with the second fixed-side mold plate 37.

The material passage of the valve casing 44
A substantially cylindrical valve pin 61 serving as a valve body for opening and closing the gate 42 is provided coaxially through the inside of the valve 51. Like the gate 42 and the valve casing 44, the valve pin 61 has an axial direction C perpendicular to the inclined surface 33a of the product cavity 33 where the gate 42 is open and moves linearly in the axial direction C. And a gate closing portion that is removably fitted to the gate 42.
It has 62 at the tip. The tip surface of this gate closing portion 62
Although 62a forms a part of the inclined surface 33a of the product cavity 33, since the axial direction C of the valve pin 61 is orthogonal to the inclined surface 33a as described above, the gate closing portion 62 The tip surface 62a is also orthogonal to the axial direction C of the valve pin 61. Further, the valve pin 61 slidably penetrates a guide bush 64 fixed by bolts 63 in a flange portion 45 of the valve casing 44, and a tip end on the gate 42 side is formed on a peripheral surface of the material passage 51. It is always slidably fitted inside the formed plurality of support blades 65. Thus, the valve pin 61 is supported by the valve casing 44. In addition, in order to rectify the flow of the resin that is the molding material while the supporting blades 65 are provided, the tip of the material passage 51 on the gate 42 side is a cylindrical portion 66 having a diameter slightly larger than the valve pin 61. ing. Further, the valve pin 61 penetrates through the manifold 38 and is connected to a hydraulic cylinder device 67 such as a hydraulic cylinder device provided on the fixed-side mounting plate or the like, and is driven by the hydraulic cylinder device 67. It has become.

As described above, the axial direction C of the valve pin 61, that is, the moving direction C is orthogonal to the inclined surface 33a of the product cavity 33 where the gate 42 is opened. If the angle β formed by the moving direction C with respect to the inclined surface 33a is within a range of about 90 ° ± 5 °, it is acceptable that the angle β is substantially orthogonal. The same applies to the angle between the axial direction C of the valve pin 61 and the tip end surface 62a of the gate closing portion 62.

The movable mold 32 is provided with the first fixed mold plate 36.
The movable mold plate 71 is fixed to a core 72 which forms a surface corresponding to the inner surface of the product 1 in the product cavity 33. Although not shown, the fixed mold 31 on the movable mold plate 71 is not shown.
A movable-side receiving plate is fixed to a surface opposite to the fixed die 31, and a movable-side mounting plate attached to a movable-side platen of an injection molding machine is a spacer on a surface of the movable-side receiving plate opposite to the fixed mold 31. The block has been fixed through. Further, the movable die 32 is also provided with a projecting mechanism for projecting the molded product 1 from the movable die 32.

Next, an injection molding method using the valve gate type mold apparatus will be described. At the time of molding, first, the fixed mold 31 and the movable mold 32 are closed, and a product cavity 33 is formed between the fixed mold 31 and the movable mold 32. Then, as shown by a chain line in FIGS. Cylinder device 67
By driving the valve pin 61 backward in the direction away from the product cavity 33 to pull out the gate closing portion 62 of the valve pin 61 from the gate 42, the gate 42 is opened.
Then, a molten thermoplastic resin as a thermoplastic molding material is injected into the fixed mold 31 from the injection molding machine. This resin passes through the runner 39 of the manifold 38 and the like, further passes through the material passage 51 in the valve casing 44, between the support blades 65 in which the valve pins 61 are fitted, and through the columnar portion 66 from the gate 42 to the product cavity 33. Flows into. After the product cavity 33 is filled with the resin in this manner, the resin pin is subjected to a pressure holding operation, and as shown by a solid line in FIGS.
Forward in the direction approaching 33, and the gate closing portion 62
The gate 42 is fitted and the gate 42 is closed. After the resin in the product cavity 33 is cooled and solidified, the fixed mold 31 and the movable mold 32 are opened, and the resin in the product cavity 33, that is, the molded product 1 is taken out. Thereafter, the mold is closed again and the above molding cycle is repeated, but throughout the molding cycle, the resin in the material passage 51 of the valve casing 44 is supplied to the heater 53 similarly to the resin in the runner 39 of the manifold 38.
Is kept in a molten state by heating.

According to the structure of the above embodiment, the gate 42 is opened on the inclined surface 33a of the product cavity 33 which is inclined with respect to the mold opening / closing direction A, but the gate 42 is moved linearly. This gate can be inserted and removed
The movement direction C of the valve pin 61 that opens and closes the inclined surface 33
Since orthogonal to a, the pressure of the resin filled into the mold cavity 33 acts in the axial direction C i.e. the moving direction C relative to the valve pin 61 does not act in the other direction i.e. radially. More specifically, the pressure of the resin in the product cavity 33 is equal to the slope 33 of the product cavity 33.
a acts on the distal end surface 62a of the gate closing portion 62 of the valve pin 61 forming a part of the valve pin 61, and applies a force to the valve pin 61 in a direction orthogonal to the distal end surface 62a. Since it is orthogonal to the axial direction C, the direction B of the force applied by the resin in the product cavity 33 to the valve pin 61 coincides with the axial direction C of the valve pin 61.
Therefore, the pressure of the resin in the product cavity 33 does not act in a direction to increase the friction between the side surfaces of the valve pin 61 and the gate 42, so that the abrasion of the valve pin 61 and the gate 42 can be suppressed. As a result, the burr is less likely to occur in the gate trail of product 1.

As described above, the distal end face 62a of the valve pin 61 forming a part of the product cavity 33 is
Is perpendicular to the axial direction C, the unevenness does not occur on the surface formed by the valve pin 61 in the product cavity 33 even if the valve pin 61 rotates in the circumferential direction with respect to the gate 42. Therefore, the valve pin
Positioning of the 61 in the circumferential direction (rotation direction) is also facilitated.

Incidentally, even if the axial direction C of the valve pin 61 is not completely orthogonal to the inclined surface 33a of the product cavity 33,
If the angle β formed between the axial direction C of the valve pin 61 and the inclined surface 33a is within the range of about 90 ° ± 5 °, the above-described effects can be obtained. Axial direction C of valve pin 61 and gate closing part
The same applies to the angle formed between the tip 62 and the tip surface 62a.

The valve device 43 including the valve pin 61, the valve casing 44 coaxially located with the valve pin 61, and the fluid pressure cylinder device 67 is elongated in the axial direction C. Since the axial direction C is also inclined with respect to the mold opening / closing direction A, the axial direction of the valve device 17 in the mold opening / closing direction A of the valve device 43 is smaller than that in the conventional case where the axial direction of the valve device 17 matches the mold opening / closing direction A. Dimensions can be reduced. Thereby, the dimension in the mold opening / closing direction A of the entire valve gate type mold apparatus can be reduced. It can be used with the fixed mold 51 and movable mold
Allows 52 to open wider.

Although not shown, in the case of the product 1 shown in FIG. 3 in which a cylindrical portion is further formed at the center of the tapered portion 3, the axial direction C of the valve device 43 is tapered. By inclining in the direction orthogonal to the inclined surface 33a of the product cavity 33 corresponding to the part 3, the valve device 17 is more in comparison with the case where the axial direction of the valve device 17 coincides with the mold opening / closing direction A as shown in FIG. 43 can be further separated from the cylindrical portion, and the extra space between the cylindrical portion and the valve device 43 (valve device assembling hole 41) can be increased. For example, when a screw is formed in the cylindrical portion, a member for that purpose must be incorporated in the fixed side mold plate 37. However, in the mold apparatus shown in FIG. 4, it is assumed that a space for incorporating the member cannot be secured. However, in the mold apparatus according to the present embodiment, the above members can be incorporated.

Further, since the gate 42 is opened at one end of the product 1 where the tapered portion 3 is located in the product cavity 33, it is possible to satisfactorily fill the entire product cavity 33 including the tapered portion 3 with resin. it can.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the above-described embodiment, the distal end surface 62a of the gate closing portion 62 of the valve pin 61 is located substantially flush with the inclined surface 33a of the product cavity 33 formed by the second fixed side mold plate 37. The tip of the gate closing portion 62 may slightly protrude into the product cavity 33. In this case, the circumferential surface of the gate closure portion 62 that projects into the molding cavity 33, the pressure of the resin in the mold cavity 33 acts uniformly over the entire circumference, the pressure of the resin in the mold cavity 33 Acts on the valve pin 61 in the axial direction C thereof.

The shape of the product 1 to be molded is not limited to that shown in FIG. 3, and the present invention is generally applied to a case where a gate must be opened on a surface of a product cavity which is inclined with respect to the mold opening / closing direction. It is effective.

[0035]

According to the valve gate type mold apparatus of the first aspect of the present invention, the gate is opened on the inclined surface inclined with respect to the opening and closing direction of the mold in the product cavity. The moving direction of the valve body that is removably fitted to the gate by opening and closing the gate by moving to the gate is substantially perpendicular to the inclined surface, so that the pressure of the molding material in the product cavity is applied to the valve body. On the other hand, by acting in the moving direction, wear of the valve body and the gate can be suppressed. At the same time, the positioning of the valve body in the circumferential direction becomes easy.

As described above, by making the moving direction of the valve body substantially perpendicular to the inclined surface of the product cavity,
As in the valve gate type mold apparatus according to the second aspect of the present invention, the distal end surface of the valve body forming a part of the inclined surface can also be substantially orthogonal to the moving direction of the valve body. Can act on the valve body only in the direction of its movement.

According to the molding method using the valve gate type mold apparatus of the third aspect of the invention, the gate is opened on the inclined surface inclined with respect to the opening and closing direction of the mold in the product cavity. Since the linearly moving valve body is removably fitted to the gate to open and close the gate and moves the valve body in a direction substantially perpendicular to the inclined surface, the pressure of the molding material in the product cavity is reduced. By acting on the valve body in the moving direction, wear of the valve body and the gate can be suppressed. At the same time, the positioning of the valve body in the circumferential direction becomes easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a valve gate type mold apparatus of the present invention.

FIG. 2 is an enlarged sectional view of the vicinity of the gate in FIG.

FIG. 3 is a sectional view of a product to be molded.

FIG. 4 is a sectional view showing an example of a conventional valve gate type mold device.

[Explanation of symbols]

 31 Fixed mold (mold) 32 Movable mold (mold) 33 Product cavity 33a Inclined surface 39 Runner (material passage) 42 Gate 43 Valve device 51 Material passage 61 Valve pin (valve body) 62a Tip surface A Mold opening and closing direction (mold) Opening / closing direction of C) Moving direction of valve body

 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Yoshinori Higuchi Niigata, Niigata Prefecture Kogane-cho 3-chome No. 1 Mitsubishi Materials Corporation in Niigata Plant (72) inventor Yoshihiro Horikawa Niigata, Niigata Prefecture Kogane-cho 3-chome No. 1 Mitsubishi Materials Corporation Niigata Works F-term (reference) 4F202 CA11 CB01 CK06 CK07

Claims (3)

[Claims] A pair of molds that open and close with each other and form a product cavity therebetween when the mold is closed, and a valve device that opens and closes a gate that communicates a material passage provided in the mold with the product cavity. The gate is opened on an inclined surface of the product cavity that is inclined with respect to the opening / closing direction of the two molds, and the valve device is removably fitted to the gate by linearly moving the valve body. A valve gate type mold apparatus for opening and closing the gate in combination, wherein a moving direction of the valve body is substantially orthogonal to an inclined surface of the product cavity where a gate is opened. apparatus. 2. The valve gate type metal as claimed in claim 1, wherein a tip end surface of the valve body forming a part of the inclined surface of the product cavity is substantially perpendicular to a moving direction of the valve body. Mold device. 3. A mold cavity is formed between a pair of molds that are opened and closed with each other to form a product cavity between the molds, and a direction in which the molds are opened and closed in the product cavity from a material passage provided in the mold. A molding method in which the molding material is filled into the product cavity through a gate opened on an inclined surface inclined with respect to the gate, and the gate is closed by a valve body of a valve device except when the molding material is filled in the product cavity. Moving the valve body, which linearly moves to open / close the gate by being removably fitted to the gate, in a direction substantially orthogonal to an inclined surface of the product cavity in which the gate is opened. A molding method using a valve-gate-type mold device.