JPS62184809A - Pouring head for resin injection - Google Patents

Abstract

PURPOSE:To reduce working man-hours and shorten molding cycle time by a method wherein both the pouring of resin and the cleaning of a pouring head are done under the state that the pouring head is fixed to a resin mold. CONSTITUTION:Resin mixed at a feeding device is supplied through a pipe 26 and a leading-in hole 24 in order to be poured in a mold 8 through a resin inlet 16. After completion of pouring, air pressure is applied in opposite direction to an air cylinder 42 so as to lower a blocking member 46 together with a rod 34 in order to closely contact a resin feeding port blocking part 50 with the opening periphery of a resin feeding port 18. As a result, the communication between an enclosed space 20 and the resin feeding port 18 is shut off while the enclosed space 20 and an discharge port 30 are brought into the state communicated with each other. Under the state just mentioned above, air is supplied from the feeding device. The air enters through the pipe 26 and the leading-in hole 24 into the enclosed space 20 so as to discharge the resin left in the enclosed space outside through the discharge port 30. After supply of the air, the cleaning fluid is supplied so as to clean the interior of a mixer, the pipe 26, the leading-in port 24 and the enclosed space 20 and, after that, discharged through the discharge port 30.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an injection head for resin injection, and is particularly used for resin injection molding in which injection of resin into a mold and cleaning of the injection head are performed alternately. It concerns an injection head.

BACKGROUND ART In conventional resin injection molding, there is a method in which an injection head is used to inject resin, and resin molding and cleaning of the injection head are performed alternately. “Owen Sue Corning Fiberglass Co., Ltd. (0 ridge N5-C0RNIN4G++IBER
GLAss C0RP, ') Report Resin Transfer Molding
An example of this is described in J. Molding, in which an injection gun was used as the injection head, and most of the series of operations, including resin injection, were performed by hand by the operator. That is, the operator places the injection gun against the resin injection port of the mold, injects the resin, stops the supply of resin from the resin supply device when the resin leaks from the mating surface of the mold, and then stops the injection. After removing the gun from the resin injection port and plugging the resin injection port to prevent resin from flowing back, switch the button to flush out the resin remaining in the injection gun and fill the injection gun with cleaning fluid and air. It was arranged so that the two lines would be played alternately.

Problems to be Solved by the Invention However, when injecting resin and cleaning the injection head through such operations, the molding of the injection gun must be completed each time the injection of resin and cleaning of the injection gun are performed alternately. This method requires many man-hours, such as pressing and separating the mold, which lengthens the molding cycle time, and it is difficult to automate, making it inapplicable to mass production.

Means for Solving the Problems In order to solve the above problems, the present invention provides a head body fixed to a resin mold, and a resin injection molded in the resin mold while the head body is fixed. A resin supply port that communicates with the inlet, a closed space that communicates with the resin supply port, one end that opens into the closed space, and the other end that opens to the outside, and a supply device that is connected to the outside opening. An introduction hole that selectively guides the resin, air, and cleaning liquid supplied into the closed space; and a discharge hole that opens to the closed space and the outside and at least a portion of the side that communicates with the closed space faces the resin supply port. A resin supply port closing part and a discharge hole are provided at one end, each having a cross-sectional area larger than the cross-sectional area of the resin supply port and discharge hole, and which tightly close the resin supply port and discharge hole around the opening thereof. A rod having a closing member in which closing portions are arranged in the axial direction is passed through the head main body through the side of the discharge hole facing the resin supply port, and the rod is inserted in the axial direction while the closing member is located in the closed space. A moving device is provided which is slidably fitted into the rod and moves the rod in the axial direction.

In the injection head configured as described above, the opening of the discharge hole is closed by the closing member due to the movement of the rod, and the resin supply port is left open. The supplied resin flows into the closed space from the introduction hole, and flows into the mold through the resin supply port and the resin injection port. Further, after the resin injection is completed, the rod is moved, the resin supply port is closed by the closing member, and the discharge hole is opened, and then air and cleaning liquid are alternately supplied by the supply device. The cleaning liquid pushes out the resin remaining in the introduction hole and the closed space, and discharges it from the discharge hole while cleaning it.

Effects of the Invention As described above, according to the injection head according to the present invention, resin can be injected and the injection head can be cleaned while being fixed to the resin mold, so that the injection head can be pressed against the mold. In addition, the number of man-hours required and molding cycle time can be shortened compared to the case where separation is performed, and injection and cleaning operations are facilitated by controlling rod movement and switching of resin, air, and cleaning liquid supplies. Can be automated.

In addition, this injection head has a simple structure and is compact because it can selectively close the resin supply port and the discharge hole by moving one closing member with one rod. And it can be manufactured at low cost.

Furthermore, since there is no rod in the space through which the resin passes, there is no risk that the resin will enter between the rod and the guide surface and prevent smooth sliding of the rod.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing an injection head for injecting a two-component thermosetting resin according to an embodiment of the present invention, and in the figure, 2 is a stainless steel housing.

A flange portion 4 extending outward is formed at one end of the housing 2, and an annular protrusion 6 formed on the end surface of the flange portion 4 fits into a fitting hole 10 formed on the upper surface of the resin mold 8. By being fitted, the housing 2 is positioned in the radial direction, and the end surface of the flange portion 4 is fixed in close contact with the upper surface of the resin mold 8. A stainless steel plate 12 is fixed inside the projection 6, and together with the housing 2 constitutes an integrated head body. A resin supply port 18 is formed in this plate 12 and communicates with a resin injection port 16 formed in the resin mold 8 when the plate 12 is fixed to the resin mold 8. A closed space 20 communicating with the resin supply port 18 is formed. As shown in FIG. 2, this closed space 20 has a circular cross-sectional shape and extends in the direction of the center line of the resin supply port 18. It is a tapered surface whose diameter gradually increases as it moves away from the surface.

Inside the housing 2, there is also a resin in a closed space 20.

An introduction hole 24 is formed to introduce air and cleaning liquid.

One opening of the introduction hole 24 is opened at the inner peripheral surface of the closed space 20, and after extending perpendicularly to the center line of the closed space 20, the introduction hole 24 is bent at right angle and the other opening is opened at the flange. The upper surface of the portion 4 is opened to the outside. A pipe 26 is fixed to this outer opening of the introduction hole 24 and is connected to a supply bag W (not shown) that selectively supplies resin, air, and cleaning liquid. , the supply device is equipped with a mixer for mixing resins, and the two types of resins are individually supplied to the mixer, mixed, and then supplied to the introduction hole 24, and air and cleaning liquid also pass through the mixer. Supplied.

A discharge hole 30 is further formed within the housing 2 .

The discharge hole 30 has one end connected to the resin supply port 18 in the closed space 20.
The upper inner wall surface facing the resin supply port 18 is opened concentrically with the center line of the resin supply port 18, while the other opening is opened on the side surface of the housing 2, forming an L-shape. Further, the inner peripheral surface of the portion of the discharge hole 30 that opens into the closed space 20 and the inner wall surface of the closed space 20 where the discharge hole 30 opens are arranged at an angle of 45 degrees in a direction that moves away from the center line toward the resin supply port 18 side. It has a tapered inner circumferential surface 32 that is inclined at an angle.

Further, a rod 34 extends vertically in the housing 2 and is fitted in the housing 2 so as to be slidable in the axial direction.

The rod 34 passes through a portion of the discharge hole 30 formed concentrically with the resin supply port 18 and is fitted into a guide member 36 fitted into the housing 2 . The guide member 36 is made of tetrafluoroethylene (tetrafluoroethylene), which is known by the trade name of Teflon, and has a dogleg-shaped ring cross section, and is formed in the housing 2 by stacking a plurality of guide members. A sealing member is fitted into the hole 38 and is pressed by a screw member 40 screwed into the opening of the hole 38 to guide the movement of the rod 34 and prevent cleaning liquid etc. from entering through the discharge hole 30. It also functions as A piston rod 44 of an air cylinder 42 as a moving device is connected to the end of the rod 34 projecting from the housing 2, and is moved by raising and lowering the piston rod 44, while the other end is connected to the discharge hole 30. A closing member 46 is attached while protruding inward. Note that the air cylinder 42 is attached to the mounting member 4
7 to the housing 2.

The closing member 46 includes a resin supply port closing portion 50 and a discharge hole closing portion 52 made of Teflon, respectively, provided at both ends of a metal main body portion 48 in the axial direction. It is attached to the rod 34, and as the rod 34 moves up and down, each of the closing parts 50, 52 is selectively brought into close contact with the periphery of the openings of the resin supply port 18 and the discharge hole 30, thereby closing these openings. . Both closing portions 50 and 52 are connected to the resin supply port 18 and the discharge hole 30.
The cross-sectional area of the portion that comes into close contact with the periphery of the opening is larger than the cross-sectional area of the resin supply port 18 and the discharge hole 30, respectively.
It has a tapered surface with the same inclination angle as 2, and is in close contact with the tapered inner circumferential surface 32 to cut off communication between the discharge hole 30 and the closed space 20. Further, the end surface of the resin supply port closing portion 50 is in close contact with the periphery of the opening of the resin supply port 18 to close the opening.
The outer circumferential surface of the main body part 48 has a tapered outer circumferential surface whose diameter gradually decreases toward the side, and the outer circumferential surface of the main body 48 has a tapered outer circumferential surface whose diameter gradually decreases toward the resin supply port closing part 50 side. An annular groove 54 is formed which is recessed toward the axis of the shaft.

Resin molding mold 8 using the injection head configured as above
The resin is injected into the interior as follows.

First, air pressure is applied to the air cylinder 42, and the rod 3
4 and the closing member 46 is raised to close the discharge hole closing portion 5.
2 is brought into close contact with the tapered inner circumferential surface 32, and communication between the closed space 20 and the discharge hole 30 is cut off, while the closed space 20 and the resin supply port 18 are brought into communication. Then, the resin mixed in the mixer by the supply device is transferred to the pipe 26. The resin is supplied through the introduction hole 24 and fills the closed space 20 while the resin supply port 18. The resin is injected into the mold 8 through the resin injection port 16.

After the injection is completed, air pressure is applied to the air cylinder 42 in the opposite direction, and the closing member 46 is lowered together with the rod 34, so that the resin supply port closing portion 50 comes into close contact with the periphery of the opening of the resin supply port 18, and the closed space 20 is closed. While communication with the resin supply port 18 is cut off, the closed space 20 and the discharge hole 30 are brought into communication, and air is first supplied by the supply device. The air first passes through the mixer and pushes out the resin inside the mixer, while passing through the pipe 26. The resin enters the closed space 20 through the introduction hole 24, pushes out the resin remaining therein, and discharges it to the outside through the discharge hole 30. After the air is supplied, the cleaning liquid is supplied and the mixer,
Pipe 26. Introduction hole 24. After cleaning the inside of the closed space 20, it is discharged from the discharge hole 30.

As is clear from the above description, according to the injection head of this embodiment, resin injection and injection head cleaning can be performed while the injection head is fixed to the resin mold 8, which reduces the number of work steps. In addition, the molding cycle time can be shortened, and the injection work can be easily automated by controlling the movement of the rod 34 and the switching of the supply of resin, air, and cleaning liquid by the supply device.

Further, when the cleaning liquid that has flowed into the closed space 20 flows out from the discharge hole 30, an annular groove 54 that is recessed toward the axis is formed in the axially intermediate portion of the closing member 46, and the inner wall surface of the closed space 20 is Since the width of the gap between the annular groove 54 and the annular groove 54 is widened, the cleaning liquid flows smoothly without stagnation compared to the case where such an annular groove 54 is not provided. Clean the outer peripheral surface well.

Furthermore, since the head body is made of stainless steel, there is no risk of it being eroded by cleaning fluid.
Since both the resin supply port closing portion 50 and the discharge hole closing portion 52 are formed of Teflon, the resin supply port 18
Moreover, the openings of the discharge holes 30 are closed without any gaps, and the impact when the respective closing parts 50, 52 come into contact with the openings is small, so that it can be used for a long period of time.

Another embodiment of the invention is shown in FIGS. 3-5. The head body (i0) of the main injection belly button 1' is formed by a first part +162 and a second member 64 fixed in a liquid-tight manner.

Both members 62 and 64 are cylindrical parts l, and each -6j:l'1 part in the axial direction has a flange part 66, 68 extending outward in the semi-longitudinal direction. The flange portions 66 and 68 are abutted against each other and fixed in a liquid-tight manner and concentrically. This head main body 60 has a second member 64 fitted into a hole 74 provided in the resin mold 70, and a flange part (i (i, 6B
-L' to the resin mold 70 with a bolt passing through J'X.
, fixed in a downward extending position. A Teflon sheet 76 is fixed to the lower surface of the second part JIA64, and the second member 64 is connected to the JR4 through the sheet 7G.
It is brought into contact with the R4 forming mold 70.

The second member 64 is formed with a bottomed hole 78 having a circular cross section that opens toward the flange portion 68 at positions pi/, l eccentric to the center line of its outer circumferential surface. A closed space 80 is formed between the first member 62 and the first member 78 .

A through hole extending in the direction of the center line is formed in the bottom wall of the bottomed hole 78 at a position concentric with the center line of the outer circumferential surface. The formed resin supply r, J 84 and the resin injection port 82 formed in the resin mold 70 are communicated with each other. A groove 86 is formed on the side of the part 68 and extends along the axis of the second member 64, and this groove 86 forms an introduction hole together with a passage 88 formed in the first member 62. (A stepped hole 92 is formed in the center of the hole 62 and extends through the first member 62.
A through hole 94 extending perpendicularly to the center line of the stepped hole 92 is formed, and these through holes 94 and the through hole 94 of the stepped hole 92 are formed.
The IA exit hole is formed by the portion below the opening portion. The stepped hole 92 is guided by a guide bushing 96 and a guide member 98 made of Teflon.
A rod 100 is fitted so as to be able to move It1 in the axial direction. The guide member 98 is similar to the guide member 36, and also serves as a seal, and is held down by a screw member 104 screwed into the upper end of the first member 62. Ro
100 slidably passes through this screw member 104, and a piston rod 10B of an air cylinder 106 as a moving device is connected to its protruding end.

The air cylinder 106 is attached to the first member 62 (;1 member 1
Only when the rod 100 is removed by the piston rod 108, the rod 100 is removed by the piston rod 108. 1"--moved downwards.

Further, a closing member 110 is provided at the end of the lock 100 that projects toward the closed space 80.

The closing member 11.0 is a cylindrical part IA with a straight cylindrical outer peripheral surface, and the lower part of the main body part 112 made of stainless steel forms the resin supply port closing part 114. A discharge hole closing portion 116 made of Teflon is formed.

The diameter of this closing member 110 is larger than the diameters of the resin supply port 84 and the stepped hole 92, and is tl·/I"
Due to the movement of l OO, occlusion (:I < 114.116
The end faces perpendicular to the axial direction of the resin supply port 84 and the stepped hole 92 are alternatively brought into contact with the respective openings and close the openings. Further, the thickness of the closing member 110, that is, the length in the axial direction is set to be one half of the distance between the resin supply port 84 and the opening 1'' of the stepped hole 92.

Furthermore, the closing member 110 is attached to the rod 100 that passes through the first member 62 on its axis, so that the closing member 110 is eccentric with respect to the closed space 80, as shown in FIG. The bottomed hole 78 forming the closed space 80 has an eccentricity between the two, that is, a gap 1 formed between the outer peripheral surface of the closing member 110 and the inner peripheral surface of the closed space 80.
The ratio of the narrowest part to the widest part of 18 is 1:4
The groove 86 that opens into the bottomed hole 78 is located at a position adjacent to the narrowest part, that is, on the side where the width becomes wider slightly from the narrowest part. It is formed so as to open partially.

Injection of resin in the injection head configured as described above is performed in a state where the rod 100 is raised and the stepped hole 92 is closed by the closing member 110, while the resin supply port 84 is opened. 1902 aisle 88. The resin supplied to the closed space 80 through the groove 86 is passed through the resin supply port 84. The resin is injected into the resin mold 70 from the resin injection port 82 . After the injection is completed, the rod 100 is lowered, and the resin supply port 84 is closed by the closing member 110, while the stepped hole 92 is opened, and the air is The cleaning liquid is alternately supplied to the passage 88.
．． Groove 86. The inside of the closed space 80 is cleaned. At this time, the closed space 80 and the closing member 110 are provided eccentrically, and the groove 86 is opened at a position adjacent to the narrowest part of the gap 118 between them, so that from the groove 86 into the gap 118. The cleaning liquid that has flowed into the gap 118 flows toward the wider side of the gap 118 where there is less resistance, and a circular flow occurs in the closed space 80 in the clockwise direction in FIG. While flowing upward, it flows into the stepped hole 92 and is discharged from the through hole 94. Further, the thickness of the closing member 110 is the same as that of the resin supply port 84 and the stepped hole 9.
2, and the difference between the cross-sectional area of the groove 86 forming the introduction hole and the cross-sectional area of the closed space 80 is made small, so that the amount of water flowing into the closed space 80 is The flow of the cleaning liquid does not slow down, and the cleaning liquid flows smoothly as it is guided into the gap 118, and the stagnation of the cleaning liquid causes poor cleaning of the resin, or the resin contained in the cleaning liquid adheres and accumulates. There is no.

In addition, in the above embodiment, the closing member 110 and the closed space 80
The eccentricity between the gap 11B was formed such that the ratio of the narrowest part to the widest part of the gap 11B formed between the two was 1:4, but is not limited to this. The ratio may be appropriately selected between 5 and 1:5.

Further, the thickness of the closing member 110 is not limited to 1/2 of the distance between the resin supply port 84 and the opening of the stepped hole 92, but may be between 1/3 and 2/3, and may be 3/3 It is even better if it is 1/2 or less.

Furthermore, in the two embodiments detailed above, the moving device for moving the rods 34, 100 is the air cylinder 42.
, 106, it is also possible to employ a moving device such as a feed screw rotationally driven by a motor.

Furthermore, both the resin supply port closing portion and the discharge hole closing portion of the closing member and the portion of the head body with which these closing portions come into contact may be formed of Teflon.

Although not illustrated here, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view showing an injection head for resin insemination, which is an embodiment of the present invention, and FIG.
It is a sectional view taken along ■-■ in the figure. FIG. 3 is a front sectional view showing an injection head for resin injection according to another embodiment of the present invention, and FIGS. 4 and 5 are a sectional view taken along the line ■-■ and a sectional view taken along the line V-V in FIG. 3, respectively. It is.

Claims (6)

[Claims] (1) The head body fixed to the resin mold has a resin supply port that communicates with the resin injection port formed in the resin mold when the head body is fixed, and the resin supply port communicates with the resin supply port. a closed space having one end open to the closed space and the other end opening to the outside, and introducing resin, air and cleaning liquid selectively supplied by a supply device connected to the outer opening into the closed space. An introduction hole and a discharge hole that opens to the closed space and the outside and at least a portion of the side that communicates with the closed space faces the resin supply port, and a discharge hole that has a cross-sectional area that is opposite to the resin supply port is formed at one end. A closing member that is larger in cross-sectional area than the supply port and the discharge hole and is formed with a resin supply port closing portion and a discharge hole closing portion that are arranged in the axial direction and close the resin supply port and discharge hole in close contact with the periphery of the opening thereof. A rod having a rod is inserted into the head main body through a portion of the discharge hole on the side opposite to the resin supply port, and is slidably fitted in the axial direction with the closing member positioned in the closed space. , and a moving device for moving the rod in the axial direction. (2) The resin injection device according to claim 1, wherein at least one of the resin supply port closing portion, the discharge hole closing portion, and a portion of the head body with which these closing portions are in close contact is formed of Teflon. injection head. (3) Surfaces of the discharge hole and the discharge hole closing portion that are in close contact with each other are inclined in a direction away from the axis of the closing member toward the resin supply port side and the resin supply port closing portion side, respectively. The injection head for resin injection according to claim 1 or 2, which has a tapered surface. (4) A concave annular groove is formed on the axis side of the closing member between the resin supply port closing portion and the discharge port closing portion of the closing member. An injection head for resin injection as described in any of the above. (5) The width of the gap formed between the outer peripheral surface of the closing member and the inner peripheral surface of the closed space surrounding the outer peripheral surface increases smoothly from the narrowest part to the widest part. The resin injection method according to any one of claims 1 to 3, wherein the introduction hole is opened at a position adjacent to the narrowest part of the gap. head. (6) The thickness of the closing member is between one-third and two-thirds of the distance between the resin supply port and the opening of the discharge hole that faces the resin supply port. The injection head for resin injection according to item 5.