JPH09277269A - Mold for molding drain pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mutual close contact state of molds to make burr hard to generate on a molded product and to enable the molding of two kinds of drain pipes by replacing only a part of molds by attaching and fixing a replacing mold forming the leading end part of an inspection pipe attaching port to a movable mold main body in a replaceable manner. SOLUTION: In two kinds of drain pipes, the end surface and inner peripheral surface of an inspection pipe attaching port are different in inclination direction. A replacing mold 42 is attached and fixed to a movable mold main body 41 by a bolt 421 as the mold for forming the end surface and the inner peripheral surface of the inspection pipe attaching port. The mating surfaces of the movable mold main body 41 and the replacing mold 42 are constituted so as to cross the molding surface of a cavity filled with a molding material at a right angle in the vicinity of the cavity. By this constitution, the pressing force of the bolt 421 acts effectively to extremely reduce the gap between the mating surfaces of the movable mold main body 41 and the replacing mold 42. Therefore, burr is not generated at this part of a molded product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming a drain pipe for connecting drain pipes to each other linearly or at different angles, and in particular, to only a part of the mold. The present invention relates to a drainage pipe molding die capable of molding two types of drainage pipes by exchanging them.

[0002]

2. Description of the Related Art A curved drain pipe is used to change the direction of a drainage channel when the drainage channels are connected to each other to form a drainage channel. As shown in FIG. 5, the direction of the inflow pipe attachment port 11 to which the inflow pipe 15 is attached and the direction of the outflow pipe attachment port 13 to which the outflow pipe 16 is attached form a predetermined angle,
The space between them is connected by a curved tube 12 curved in an arc shape. The angle between the inflow pipe mounting port 11 and the outflow pipe mounting port 13 is usually 90 degrees. Since dust, foreign matter and the like are likely to be clogged at the curved portion of the drainage channel, the curved portion is provided with the inspection pipe attachment port 14 so that the inspection pipe 17 for inspection can be connected.

FIG. 7 shows how the drainage pipe is installed underground.
Is shown in FIG. 7 is a view of the drainage pipe 10 in a cross section taken along the curved central axis line. The inflow pipe 15 and the outflow pipe 16 are connected by the drain pipe 10. Drainage pipe 1
The curved central axis A of 0 is provided at a predetermined angle α with respect to the horizontal direction H so that the drainage flows smoothly.

However, the inspection pipe 1 for inspecting the curved portion
Since 7 is provided so as to be orthogonal to the ground surface G (horizontal direction), the central axis B of the inspection pipe 17 is vertical, and the axis C and the central axis B orthogonal to the central axis A are predetermined. It forms an angle β. The center axis of the inspection tube mounting port 14 with respect to the contour of the outer peripheral portion is parallel to the axis C, and the center axis of the inspection tube mounting port 14 with respect to the inner peripheral surface coincides with the center axis B. In addition, the end face of the inspection pipe mounting port 14 has a central axis B
It is a plane orthogonal to. That is, the end surface of the inspection pipe attachment port 14 is inclined with respect to the outer peripheral surface of the inspection pipe attachment port 14.

As for the drain pipe 10, as shown in FIG. 5, one having an outflow direction curved to the right with respect to the inflow direction and one having an outflow direction curved to the left with respect to the inflow direction as shown in FIG. is there. Since the inflow pipe mounting port 11 and the outflow pipe mounting port 13 have the same shape and can be used in common, the two types of drain pipes 10 differ only in the shape of the tip end and the inner surface of the inspection pipe mounting port 14. Therefore, in order to manufacture such a drain pipe, a mold as disclosed in Japanese Utility Model Publication No. 2-20295 has been devised. In this method, two types of drainage pipes are manufactured by rotatably providing an inner mold for forming the tip end surface and the inner surface portion of the inspection pipe mounting port and rotating the inner mold.

[0006]

[Problems to be Solved by the Invention] Conventional Actual Fairness 2-20
In the one like Japanese Patent No. 295, since the outer mold and the inner mold for molding the inspection pipe mounting port are rotatably provided to each other,
A gap is likely to be formed between the inner mold and the outer mold, and burrs may be generated in the drainage pipe which is a molded product.

In view of the above, the present invention provides a drainage pipe which has good adhesion between molds and is unlikely to cause burrs on a molded product, and can form two types of drainage pipes by exchanging only a part of the molds. An object is to provide a molding die.

[0008]

In order to achieve the above object, a drainage pipe molding die according to the present invention inspects an inflow pipe attachment port into which drainage flows and an outflow pipe attachment port from which drainage flows out. A mold for forming a drainage pipe having an inspection pipe mounting opening for holding a fixed side mold and a movable side mold, wherein the movable side mold has the movable side mold body with the inspection pipe. An exchange die for molding the tip of the attachment opening is exchangeably attached and fixed.

Further, in the above drainage pipe molding die, the curved pipe between the inlet pipe attachment port and the outlet pipe attachment port of the drainage pipe may be curved in an arc shape.

Further, it is preferable that a mating surface in the vicinity of the cavity between the movable-side die body and the exchange die in the drain pipe molding die is substantially orthogonal to the molding surface of the cavity.

Further, in the above-mentioned drainage pipe molding die, the movable side die forms two inner surfaces of the curved pipe of the drainage pipe, and two movable arcs can be performed with respect to the movable side die body. It is preferable to have a curved portion slide core and an attachment port slide core formed by molding the inner surfaces of the inflow pipe attachment port and the outflow pipe attachment port and attached so as to be linearly movable with respect to the curved portion slide core.

Further, in the above-mentioned drainage pipe molding die,
The movable mold has an intermediate insert located between the two curved slide cores, and an engaging surface between the curved slide core and the intermediate insert is provided with an uneven portion that fits with each other. Is preferably provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view from the front of a drainage pipe molding die of the present invention. Molded drainage pipe 10
Are shown in FIG. The mold comprises a stationary mold 31 and movable molds 41 to 47. The fixed mold 31 is attached and fixed to the fixed mold plate 30, and the fixed mold plate 30 is further attached to a fixed die plate of an injection molding machine (not shown). The sprue bush 32 is a portion joined to the nozzle of the injection molding machine. The movable mold body 41 is attached and fixed to the movable mold plate 40. Movable side template 4
0 is connected to the movable side attachment plate 50, and the movable side attachment plate 50 is attached to the movable side die plate of the injection molding machine (not shown) to perform mold clamping and mold opening after molding.

There are two types of drain pipes 10, which are a right bend as shown in FIG. 5 and a left bend as shown in FIG. 6. In these two types of drain pipes 10, the end face and the inner peripheral surface of the inspection pipe attachment port 14 are provided. The inclination directions of are different. As a mold for forming the end surface and the inner peripheral surface of the inspection pipe mounting port 14, a replacement mold 42 is mounted and fixed to the movable-side mold body 41 with bolts 421. An exchange insert 43 and an intermediate insert 44 are fixed to the exchange mold 42. The replacement mold 42 and the replacement insert 43 have a circumferential position of 1 in correspondence with the shapes of the two types of inspection tube mounting ports 14.
The inspection pipe mounting port 14 is attached by changing the inclination direction by 80 degrees. The intermediate inserts 44 are attached to the two types of drain pipes 10 in the same posture. Also, the intermediate nest 4
4 is provided with convex portions 441 on both sides thereof.

The exchange mold 42 is not movable with respect to the movable-side mold body 41, and is exchangeably fixed by a bolt 421. In addition, the movable mold body 41 and the replacement mold 4
The mating surface with 2 is configured to be orthogonal to the molding surface of the cavity filled with the molding material in the vicinity of the cavity. As a result, the pressing force of the bolt 421 effectively acts, and the gap between the mating surfaces of the movable-side mold body 41 and the replacement mold 42 becomes extremely small. Therefore, burrs do not occur in this part of the molded product.

The movable side mold plate 40 has a curved portion slide core 46 for forming an inner surface of the curved pipe 12 of the drainage pipe 10.
And an attachment port slide core 47 for forming the inner surfaces of the inflow pipe attachment port 11 and the outflow pipe attachment port 13. The curved portion slide core 46 is provided with a concave portion 461, and the concave portion 461 is configured to fit with the convex portion 441 of the intermediate insert 44 when the curved portion slide core 46 is in the forward position. With this configuration, the bending portion slide core 46 can be positioned with high accuracy. In this embodiment, the convex portion is provided on the intermediate insert 44 and the concave portion is provided on the curved portion slide core 46. However, the concave portion may be provided on the intermediate insert 44 and the convex portion may be provided on the curved portion slide core 46.

A chamfered slide core 45 is provided at the front end of the curved slide core 46. The chamfer slide core 45 is configured to interlock with the movement of the attachment port slide core 47 by a wedge mechanism (not shown). When the mounting opening slide core 47 is at the forward position, the chamfered portion slide core 45 moves down to form a chamfered portion, and when the mounting opening slide core 47 is at the retracted position, the chamfered portion slide core 45 moves. Ascend to the retracted position.
When the chamfered slide core 45 is at the retracted position, the curved slide core 46 can be extracted without interfering with the molded product.

The mounting port slide core 47 is linearly slidable on the slide core base 48. The curved slide core 46 has a rod-shaped handle 462, and the handle 462 penetrates the attachment port slide core 47.
The rear end of the slide core base 48 is connected by the connecting member 49.
It is fixed to. The mounting opening slide core 47 is allowed to move linearly with respect to the bending portion slide core 46.
The mounting port slide core 47 is provided with a slanted hole, and the slant pin 33 fixed to the stationary mold plate 30 is loosely fitted in the slant hole. At the position where the mold is closed, the inclined surface 301 provided on the stationary mold plate 30 is engaged with the rear inclined surface 471 of the mounting opening slide core 47 to form the mounting opening slide core 47 and the curved portion sliding core 46. Lock in position. When the mold is opened, the attachment port slide core 47 automatically moves linearly by the action of the inclined pin 33, and the drain pipe 1
Extracted from zero.

The curved portion slide core 46 and the attachment port slide core 47 are shown only for one attachment port in FIG. 1, but are actually provided for both the inflow pipe and the outflow pipe attachment port. Has been. Further, the tilt pin 33, a slide core base 48, which will be described later, a swing gear 52, an intermediate gear 5
3, slide rack moving mechanisms such as the rack 54 and the hydraulic cylinder 55 are also provided corresponding to the respective mounting ports, but the illustration is omitted because the figure becomes complicated.

FIG. 2 is a side sectional view of the drainage pipe molding die of the present invention, which is a sectional view taken along line DD in FIG. However, while the mold of FIG. 1 is closed, FIG. 2 is a diagram when the mold is opening. An exchange insert 43 and an intermediate insert 44 are attached and fixed to the exchange mold 42 by bolts 422. Further, the exchange mold 42 is exchangeably attached and fixed to the movable-side mold body 41 by bolts 421. There is. Further, the ejector pin 51 is for pushing the drain pipe 10 that has been molded to separate it from the movable side mold. A swing gear 52 that swings around the shaft 521 is provided, and the slide core base 48 is fixed to the swing gear 52.

FIG. 3 is a plan view showing a partial cross section of the drainage pipe molding die. FIG. 4 is also a plan view similarly showing a partial cross section of the drainage pipe molding die, but the cutting positions of the cross-section portions are different. The slide core base 48 to which the bending portion slide core 46 and the attachment port slide core 47 are attached is
It is fixed to a swing gear 52 that swings around 21.
When the molding is completed, the mold is opened and the attachment port slide core 47 is retracted and withdrawn from the drain pipe 10, the swing gear 52 is then swung to move the curved slide core 46 to the drain pipe 10.
Pull out from. The rocking gear 52 is rocked by a rack 54 and an intermediate gear 53 that are moved forward and backward by a hydraulic cylinder 55.
Mechanism. The extraction completion position of the bending portion slide core 46 is detected by the limit switch 522 shown in FIG. 2, and the operation of the hydraulic cylinder 55 is stopped by the detection signal.

In this embodiment, the drain pipe 10 is described as an example of a curved drain pipe in which the curved pipe 12 between the inlet pipe mounting port 11 and the outlet pipe mounting port 13 is curved in an arc shape. In addition to such a shape, as the drainage pipe, there are a straight pipe having an inflow pipe attachment port and an outflow pipe attachment port in a straight line, a Y-shaped pipe having two inflow pipe attachment ports, and the like. The drainage pipe molding die of the present invention can be applied to drainage pipes of other shapes as well, as long as two types of drainage pipes exist depending on the inclination direction of the tip of the inspection pipe attachment port.

[0023]

Since the present invention is configured as described above, it has the following effects.

Since the movable-side mold body and the replacement mold are not movable but fixed, the molds are well adhered to each other, and burrs are less likely to occur in the drain pipe which is a molded product.

By exchanging only a part of the mold, two types of drainage pipes can be molded, and the cost of the mold can be reduced.

Since the mating surface between the movable-side mold body and the replacement mold is constructed so as to be orthogonal to the molding surface of the cavity, the gap between the mating surfaces should be made very small by the pressing force of the bolt. You can

By the moving mechanism of the slide core, the inner mold can be automatically pulled out from the drain pipe after molding.

By providing the engaging portions of the curved slide core and the intermediate insert with the concavo-convex portions that fit with each other, the curved slide core can be positioned with high accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view from the front of a drainage pipe molding die of the present invention.

FIG. 2 is a cross-sectional view of a drainage pipe molding die from a side surface thereof, which is a cross-sectional view taken along line D-D of FIG. 1.

FIG. 3 is a plan view showing a partial cross section of a drainage pipe molding die.

FIG. 4 is a plan view showing a partial cross section of a drainage pipe molding die.

FIG. 5 is a perspective view of a right-turn drain pipe.

FIG. 6 is a perspective view of a left bent drain pipe.

FIG. 7 is a diagram showing a state in which a drainage pipe is installed underground.

[Explanation of symbols]

 10 ... Drain pipe 15 ... Inflow pipe 16 ... Outflow pipe 17 ... Inspection pipe 30 ... Fixed-side mold plate 31 ... Fixed-side mold 32 ... Sprue bush 33 ... Inclined pin 40 ... Movable-side mold plate 41 ... Movable-side mold body 42 ... Exchange mold 43 ... Exchange insert 44 ... Intermediate insert 45 ... Chamfer slide core 46 ... Curved slide core 47 ... Mounting slide slide 48 ... Slide core base 49 ... Connecting member 50 ... Moveable side mounting plate 51 ... Ejector pin 52 ... Oscillating gear 53 ... Intermediate gear 54 ... Rack 55 ... Hydraulic cylinder

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication // B29L 23:00

Claims (5)

[Claims] 1. A drainage pipe (10) having an inflow pipe attachment port (11) into which drainage flows, an outflow pipe attachment port (13) from which drainage flows out, and an inspection pipe attachment port (14) for inspecting the inside of the pipe. Which has a fixed side die (31) and a movable side die (41-47), wherein the movable side die (41-47) is a movable side die body (4).
A drainage pipe molding mold in which a replacement mold (42) for molding the tip portion of the inspection pipe mounting opening (14) is replaceably attached and fixed to 1). 2. The drain pipe molding die according to claim 1, wherein the drain pipe (10) has the inlet pipe mounting port (11).
A mold for forming a drainage pipe, wherein the curved pipe (12) between the outlet pipe attachment port (13) and the outlet pipe attachment port (13) is curved in an arc shape. 3. The drainage pipe molding die according to claim 1, wherein the movable-side die body (41) and the replacement die (42) are mating surfaces in the vicinity of the cavity. A mold for drainage pipe molding in which is almost perpendicular to the molding surface of the cavity. 4. The drainage pipe molding die according to claim 2, wherein the movable die molds an inner surface of the curved pipe (12) of the drainage pipe (10). Then, two curved portion slide cores (46) capable of performing an arcuate movement with respect to the movable side mold body (41), the inflow pipe mounting port (11) and the outflow pipe mounting port (13).
And a mounting opening slide core (47) which is mounted on the curved portion slide core (46) so as to be linearly movable. 5. The drainage pipe forming mold according to claim 4, wherein the movable mold has an intermediate insert (44) located between the two curved slide cores (46). The concave-convex portions (461, 441) fitted to each other on the engaging surfaces of the curved slide core (46) and the intermediate insert (44)
Mold for drainage pipe that is provided with.