JPS60115425A - Blow molding apparatus for bent product - Google Patents

Abstract

PURPOSE:To provide an apparatus which enables blow molding of a bent product with a shape of V, S character or the like accurately by such a simple construction as only mounting upper and lower parts of a pair of split dies on the upper and lower surfaces of one main part of the split dies respectively in such a manner as to free to oscillate. CONSTITUTION:First, mobile discs 4 and 4 are moved in the closing direction to join main parts 8 and 8 of split dies alone while the main section of honeycomb of a bending die is formed with the half surface 12 of the main section of honeycomb of the die and the cup 28 of an air sucker is made to abut on the bending die honeycomb main section to form an air current therein. Then, cylind rical synthetic resin parison P is extruded from an extrusion die 31 to be inserted into the die honeycomb main section on the air current. As soon as the lower end of parison P enters the cup 28, the parison extrusion is halted and the cup 28 is lowered. Thereafter, the upper parts 6 and the lower parts 7 of the split dies are joined respectively so that the upper part of the parison P is pinched and closed with the upper parts 6 of the split dies causing an air pin 32 to be grasped with the half surface of a blow-off port while the lower end of the parison P is done with the lower parts 7 of the split dies. Then, air is blown into the parison P from the air pin 32 to perform a blow molding as desired.

Description

DETAILED DESCRIPTION OF THE INVENTION The present inventor has previously proposed a method for blow molding products with bent shapes such as a dogleg shape, an eight shape, a shape, etc. It is divided into three parts: a lower part of the mold and a main part of the split mold. Using a mold with a lower end of the split mold main part and a half main part of the bent mold cavity remaining, first join the pair of mold cavity main parts, and make upper and lower end openings inside. forming a bent-type nest main part, and lowering the parison into the bent-type nest main part from the upper end of the opening, and applying an intake action inside the mold nest main part to the lower end of the opening, thereby converting the parison into a bent-type nest main part. The upper and lower parts of the pair of split molds are respectively joined together, and the upper and lower ends of the parison are clamped and closed. We proposed a method consisting of holding an air pin, and blowing air into the parison from an air bottle to perform blow molding.

The present invention provides a blow molding apparatus for bending products that can effectively carry out the blow molding method described above and has an extremely simple configuration. The present invention will be described in detail below with reference to the drawings.

In Figure 1.2, the surface plate +21 is placed on the bed (1),
(2+ are fixed standing up parallel to each other at appropriate intervals, and t slide ronds (3)- are supported horizontally between the demarcation plates (2), (2), and the slide ronds (3)- A pair of movable plates +41 and +4+ are supported so as to be slidable in the horizontal direction, and a pair of split molds (5) and (5) are attached to opposing surfaces of both rotary plates 14) and 141. (C) and (C) are hydraulic cylinders that are horizontally fixed to the above-mentioned surface plates f21 and +21, and their rams (to) and - are fixed to the movable plates 141 and +4+, and the cylinders (c) and ( The pair of split molds f5+ and +51 can be moved relative to each other in the joining and separating directions by forward and backward driving of the mold.

The above-mentioned split molds i5+ and 15+ each consist of three divided parts: a split mold upper part (6), a split mold lower part (7), and a split mold main part (8). In this example, the bent half surfaces of the product that bend in the / dimension and the two dimensions are respectively formed, and among them, the upper part of the split mold (6)
, (6), the air outlet half surface (91) that should hold the air pin, and the upper end Q (I) of the bent hole half surface, and the lower part of the split mold (91),
7), At the joint surface of (7), attach the lower end I of the curved nest half surface.
The remaining curved nest main parts are formed on the joining surfaces of the split mold main parts +81 and 181, respectively, and a pair of rectangular parallelepiped split mold main parts 181 and 181 are formed among the split molds. On the opposing surfaces of the pair of movable plates +41 and +41, the base plate), mold nest half opening), and μs1 are fixed facing each other via decoys, and the split mold main parts (8) and (8 ) with a pair of split mold upper parts 161 and +6+ on the upper surface of one side, and a pair of split mold lower parts (7
) and (7) are each supported swingably.

Looking at the support structure of the pair of split mold upper parts +6i and +6+, first, the split mold upper parts +61 and +61 have arm portions Qa) and (131) extending from one side of the main body as shown in FIG. Gear 11→, u4 at the tip □
J are fixed respectively, and these split mold upper parts 161.
As shown in FIG. 7, the gear 5 (2) is meshed with the gear 5 (2) with the upper ends αe and no of the mold cavity half faces facing each other at one side of the upper surface of the split mold main part (8). 0, (
The shaft (5) penetrates through the axis of (6), and the main part of the split mold (
8) Support the upper surface so that it can swing freely while sliding, and when the upper parts of the split molds (6+, +61) are swung and joined together, the joining surface will be the main part of the split molds (8), (8). ), and intersects with the joint surface of the joined split mold upper part 16+, (the top end of the eggplant mold nest of (el) joins the split mold main part (8), and the upper end of the eggplant mold nest main part of (8)). They have a continuous positional relationship. +161, f16] is the axis (5) formed on the upper surface of the split mold main part (8), μs)
With an arc-shaped guide Tf14 centered at ), (lη head screw, four slides automatically engage.

Above split mold upper part f61. As a driving means for swinging f61, the guide T groove - is provided on the base plate) as shown above: mold main part +8
1 Laid parallel to the top surface, the rack υ that engages with one of the gears is slidably supported in the groove 4, and the rack υ is supported on the − side of the base plate at one end of the rack υ. The ram d of ) is connected to the hydraulic cylinder, and the rack eυ is reciprocated by the forward and backward drive of the cylinder), and the split mold upper parts (6) and (6) are synchronously rocked through the gear (1411 helical curve). It's meant to move.

a pair of split mold lower parts (7) at the lower part of the split mold main part (8);
(7) The supporting structure and its driving means are also split mold upper part (6),
This is substantially the same as (6).

2) - is a guide pin protruding from the mating surface of one of the split mold main parts (8) in order to perform the split mold metal layering in the correct position, and the guide pin engages with the other split mold main part (8). There should be a pin hole provided. Note that a normal cooling jacket is installed inside the split mold main parts (8), (8).

The above pair of split mold main parts +81. An air intake device for introducing the parison into the bent nest is provided below the joint surface of +81, and this is carried out by pushing an air cylinder (2f9 ram ■ upwards) fixed vertically to the bed (1). The intake cup decoy protrudes from the upper end of the ram and is fixed above the intake cup decoy, and a hose is attached to the intake hole formed in the lower circumferential wall of the cup, and the hose is connected to a vacuum device (not shown). It is connected to. The above cup (to) is the joined split mold main part (81% +
The ffl device has an inner diameter slightly larger than the lower opening end of the bent main part of the mold nest formed by 81, and comes into contact with the lower end of the opening of the main part of the mold nest when raised by the drive of the air cylinder.

00 is the extrusion die of the extruder placed above the joining surface of the split mold main parts fat and f8+.
is made to hang down and protrude at a position where it is sandwiched between the blowing mouth halves +91 and +91 when the upper parts of the split molds +61 and +61 are joined together.

The operation of this device will be explained next. From the state shown in Fig. 1.2, the movable platen 1 is first driven by the hydraulic cylinder (c) and the e-shaft.
41, +41 to the joining direction and split mold main part (8),
Combine only (8). In this state, first raise the cup (toward) by driving the air cylinder of the intake device forward, and then raise the cup (toward) by driving the air cylinder of the intake device. When the opening of the cup holder is brought into contact with the lower end of the opening of the cup holder and the intake action is started through the hose diagram, an airflow is generated that flows from the upper end to the lower end within the bent main part. Next, when the cylindrical synthetic resin parison (P) is extruded from the extrusion die @υ and lowered by its own weight into the upper end of the opening of the bent mold nest main part, the parison ψ) is guided by the airflow and forms a bent mold nest. It is inserted smoothly into the main part. When the lower end of the parison (P) protrudes an appropriate length from the lower opening end of the bent main part into the cup, the parison extrusion is stopped, and after lowering the cup, the upper and lower parts of the split mold are The upper part of the split mold +61, +61 and the lower part (7), (
7) are joined together, and the upper part of the split mold (+61.161) clamps and closes the upper part of the parison (P) while pinching the air bottle with its front end of the air outlet +91.191, and the lower part of the split mold (7) ), (7), the lower end of the parison is pinched and closed.

Next, air is blown into the parison from an air bottle to inflate the parison and perform the desired blow molding.

After molding, the parison is cut from the extrusion die O, and the upper part of the split mold (6), (6) is driven by the hydraulic cylinder.
) and the lower part (7), C7), and then the hydraulic cylinders (to) and (to) are driven backward to open the split mold main part f81, +8
Open 1 and take out the molded product.

Another embodiment shown in FIG.
This is an example in which a double-toothed rack @υ is engaged with gears +14J and 114 in 6), and the pair of split mold lower parts (7) and (7) are constructed in the same way, and the configuration of the pond is substantially the same as the upper part. .

According to the blow molding apparatus for bent products of this invention,
It is possible to reliably blow mold bent products such as S-shaped shapes.
In addition, the structure is simple, with a pair of split mold upper parts and a pair of split mold lower parts each swingably attached to the upper and lower surfaces of one split mold main part. It also has the advantage of being able to be carried out by simply adding a few mechanisms to the blow molding apparatus, making it extremely useful.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 7 is a partially cutaway front view, FIG. 2 is a plan view of the same as above, FIG. The enlarged sectional view taken along the line ■-■ and Figure S are a partial route plan view of another embodiment. ≠...Movable plate, S...Split mold, 6...Split mold upper part, 7
...lower part of the split mold, za...main part of the split mold, 9...half side of the blowing port, IO...upper end of the bent half side of the nest, /l...lower end of the bent half side of the nest, / 2...Main part of the bent half of the nest,
/3...Shaft, 2g...Intake cup. 'Machi i' JP-A-Sho GO-115425 (6)

Claims (1)

[Scope of Claims] A pair of split molds are attached to opposing surfaces of a pair of movable plates that are supported so as to be movable relative to each other in the joining and separating directions, and the pair of split molds are split molds. It is composed of three divided parts: an upper part, a lower part of the split mold, and a main part of the split mold, and a bent mold nest half face of the bent product is formed on the composite bonding surface of these three parts, among which the joining surface of the upper part of the split mold The upper ends of the blow-out half surface and the bent hole half surface are connected to the joint surface of the lower part of the split mold, and the lower end of the bent hole half surface is connected to the joint surface of the split mold main part. The pair of split mold main parts are fixed to opposing surfaces of the pair of movable plates, and the upper part of the pair of split molds is placed on the upper surface of one of the split mold main parts, and the pair of split molds is placed on the bottom surface of one of the split mold main parts. The lower parts are swingably supported so that the upper and lower ends of the mold nest halves are joined and separated, and the upper and lower ends of the joined pair of split mold lower parts and the pair of split mold lower parts are respectively attached. In order to join and separate the pair of split mold upper parts and the pair of split mold lower parts, respectively, in a positional relationship that is continuous with the upper and lower ends of the mold nest main parts formed by the pair of split mold main parts whose parts are joined, - A swinging drive element/stage is provided, and a cup that sucks air from the outside is installed on the outside of the pair of split molds so that it can move forward and backward. A blow molding device for bending products that is in contact with and positioned at the lower part of the opening of the main part of the mold cavity formed by the main part of the split mold.