JPH07171886A - Split form and blow molder for split form - Google Patents

Abstract

PURPOSE:To provide resin forms, each of which having damaged part can easily be changed, which are light in weight and have great strength and, at the same time, can be produced at low cost. CONSTITUTION:A blow molded split form 20 for placing concrete consists of a front panel 30 and a backup panel 40, both of which are detachably made into an integral body through bonding pins 50 and has a flat surface at one side and a backup surface made of curved surface plate, which has curved wavy crosssectional shape and is intermittently and integrally welded to the flat surface so as to have hollow parts inside, at the other side of the split form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split mold comprising a front panel having a flat surface for pouring concrete and a backup panel joined and integrated behind the flat panel, and a blow molding machine for the split mold.

[0002]

2. Description of the Related Art Conventionally, since a concrete casting formwork is inexpensive, a work-formed form of wood has been used, but the surface is scratched by using it once or twice or at most three or four times. The form (panel) with is almost disposable,
It was disposed of by incineration. Such a usage example is a big problem in terms of resource protection and environmental problems in the present day when the depletion of wood resources is just around the corner. On the other hand, from the viewpoint of protecting such wood resources, a resin mold produced by an injection molding machine has started to be used as a substitute, is lightweight, is easy to handle, and can be used repeatedly 4 to 5 times. There was also.

[0003]

However, the resin molds produced by the injection molding machine can withstand repeated use of 4 to 5 times or more, are lightweight and easy to handle, but are difficult to repair once they are damaged to a large extent. Each panel needs to be replaced, and its manufacturing cost is extremely higher than that of a wood panel. An object of the present invention is to make a panel having a concrete placing surface that is easily scratched and a panel having a structural strength to support it into a detachable integral structure so that the placing side panel can be replaced, and an injection molding machine can be used. Therefore, the present invention intends to provide a resin-made split mold which is relatively inexpensively and efficiently molded by blow molding.

[0004]

In order to solve the above-mentioned problems, according to the present invention, there is provided a split formwork for blow-casting concrete, the split formwork comprising a joining pin. Via a front panel and a backup panel which are detachably integrated with each other, one surface of both panels is formed by a smooth flat surface, and the backup surface behind the one surface is formed by a bent corrugated shape. Moreover, the one surface and the backup surface are intermittently fused and integrated with each other to form a hollow portion inside, and the backup surface of the front panel and the smooth surface of the backup panel are joined together. The blow molding machine for a split mold of the present invention comprises a female mold having a smooth flat surface and a male mold having a plurality of tack-off cores that reciprocate in the mold advancing / retracting direction. This is a blow molding machine for a split mold, in which a pair of right and left molds are arranged in upper and lower pairs and the front panel and the backup panel according to claim 1 are simultaneously clamped and molded from one flat parison.

[0005]

In the split formwork of the present invention, the front panel, which is made of resin by blow molding and serves as a concrete placing surface, and the backup panel behind the front panel are detachably joined by the joining pins. The front panel can be easily replaced and the backup panel can be used semipermanently in case of damage or wear. Therefore, it is economical because it is lightweight, easy to handle, low in manufacturing cost, and the front panel can be replaced. That is,
Both the front panel and the backup panel consist of a smooth flat surface and a backup surface that supports this flat surface. The backup surface is an integral structure with a wavy bend and hollow inside, so it is lightweight and structurally strong, and is made by blow molding. It is easy to manufacture and the manufacturing cost is much lower than that by injection molding machine. Further, in the blow molding machine for a split mold of the present invention, the joining of the portion of the corrugated bent portion of the backup surface, which is fused and solidified on the flat surface, is joined to one of the male and female molds of the male and female molds. A mold having a tack-off core that can be reciprocated separately is arranged one by one in the upper and lower directions, and the mold can be simultaneously clamped and molded from one flat parison that hangs the front panel and the backup panel. Therefore, the molding process is short, and one set of split molds can be easily manufactured.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 10 relate to an embodiment of the present invention, FIGS. 1 and 2 are perspective views of a split mold, FIG. 3 is a partial cross-sectional view of the split mold, and FIG. 4 is a plan view of the split mold. 5 is an overall vertical cross-sectional view of the blow molding machine, FIGS. 6 and 7 are vertical cross-sectional views of main parts for explaining the blow molding process of the split formwork, FIG. 8 is a cross-sectional view of main parts of the pin joining part, and FIG. 9 is pin joining FIG. 10 is a side view of a joining pin showing another embodiment. 1 to 4
Shows one embodiment of the split formwork of the present invention.
It has a size of 00 mm, a length of 900 mm, and a thickness of 700 mm. The length is 1200 mm in addition to 900 mm
m, 1800 mm is also adopted. Regarding the material, PP (polypropylene) and PE (polyethylene) are inexpensive and are mainly used, but other materials may be used. The split formwork 20 is formed by laminating a front panel 30 and a backup panel 40 having a substantially rectangular panel shape and having the same area, and both have smooth surfaces 30A and 40A.
And backup surfaces 30B and 40B behind them and side surfaces 30C and 40C that join them together. The smooth surfaces 30A and 40A are flat, whereas the backup surfaces 30B and 40B have a role of reinforcing the structural strength of the front panel 30 and the backup panel 40, respectively.
As shown in FIG. 3, a part of a curved plate bent into a substantially corrugated shape is intermittently fused and integrated with the back surfaces of the smooth surfaces 30A and 40A at the concave portion, and is an integrally molded product having a hollow portion inside as a whole. is there. The front panel 30 has a thickness of 20 mm, the backup panel 40 has a thickness of 50 mm, and the divided panel 20 in which the two are combined has a thickness of 70 mm, but of course other dimensions may be used. Front panel 30 smooth surface 3
0A serves as a casting surface as the split formwork 20. As described above, the smooth surfaces 30A and 40A and the backup surface 30B,
As shown in FIG. 3, a bending plate inclined at a right angle or at an angle of 60 ° to 80 ° reciprocates as stiffeners at substantially equal intervals in the width direction and the length direction at a thickness portion with 40B. Just like the paperboard (corrugated paper), the panels 30 and 40 are structurally reinforced to enhance the rigidity and durability of the split formwork 20 which is a panel-shaped molded product.
A plurality of through holes 40a formed around the backup panel 40 are used for bolt penetration for joining adjacent divided molds 20, 20 ,. Therefore, the through hole 40a
The bent plate having the above is a wall surface orthogonal to the smooth surface 40A without being inclined. In order to join and integrate the front panel 30 and the backup panel 40 formed in such a shape, as shown in FIGS. 8 to 9, the backup surface 30B of the front panel 30 and the smooth surface of the backup panel 40 are integrated. The joining pin 50 is inserted into the pin hole 52 that is drilled concentrically with 40A to join and integrate them. The pin hole 52 is provided with 6 to 8 radial slits 52a as shown in the drawing. When the joining pin 50 is inserted, the backup surface 30B and the smooth surface 40A are elastically deformed, and the diameter thereof is slightly larger than that of the pin hole 52. The penetration of the joining pin 50 of. Also, the joining pin 50
The attachment is stable due to the above-mentioned elastic deformation, and the joining pin 50 can be pulled out in the opposite direction when detached. FIG. 10 shows another embodiment of the joining pin 50. The joining pin 50 is provided with a wedge slit 50a to facilitate mounting and dismounting. The joining pin 50 has tips opposite to each other. Has a gentle inclination, and a detaching stepped seat 50b is provided at the rear end to facilitate pulling out. Joining pin 5
In the above-described embodiments, 0 is a type that is press-fitted in the axial direction, but a method that utilizes a wedge effect by rotation by using a joining pin having an elliptical cross section in the elliptical pin hole 52 is also used. But it's okay. It is desirable that the one-touch type be attached and detached. As described above, the front panel 30
The split formwork 20 in which the backup panel 40 and the backup panel 40 are joined and integrated is easily and easily formed by blow molding as will be described later, and the inside is hollow, and the backup surface is intermittently fused to a smooth surface. Because it is integrated,
Light weight, strong structural strength, and inexpensive to manufacture. Further, since the front panel 30 serving as the driving surface is easily separated from the backup panel 40, it can be easily replaced with a substitute.

Next, a method for manufacturing the split mold according to the present invention will be described. FIG. 5 shows a blow molding machine 1 for manufacturing split molds. The blow molding machine 1 shown in the figure is a so-called side-feed type blow molding machine that supplies molten resin from one side of the die head 2, and the resin in the high-temperature molten state pressed by the extruder 4 is supplied by the resin. The parison P is formed by being discharged from the lowermost annular space passage 7 through an annular passage provided between the die head 2 and the mandrel 3 via the mouth 2a. Then, the core 3a is connected to the Parison rod 6a penetrating the mandrel 3, and is slightly moved up and down by the operation of the Parison cylinder 6,
The gap of the annular space passage 7 can be adjusted to control the thickness of the parison P. In this way, the hollow parison P ejected or extruded in a cylindrical shape from the die head 2 has a parison pinch (not shown).
Then, the bag is made into a bag shape, pre-blown, slightly inflated, and hung down between the pair of left and right opened molds 8.
On the other hand, in the molds 8 of the blow molding machine 1 for blow molding the split mold 30 of the present invention, there are two upper and lower sets, the upper stage is for manufacturing the backup panel 40, and the lower stage is for manufacturing the front panel 30. One of the left and right molds 8, 8 is a concave female mold 8A having a smooth surface in the vertical direction, and the inside of the mold is a tack-off type which can be reciprocated by hydraulic cylinders 10a, 10a in the other mold direction. It is formed with a male die 8B in which the child 10 is arranged. The tack-off core 10 has a plurality of protrusions and is integrated in accordance with the shapes of the recesses of the backup surfaces 30B and 40B, and is attached to the platen 9 by the operation of a pair of upper and lower hydraulic cylinders 10a and 10a. It can be moved forward separately from the mold 8 (male mold 8B). Female mold 8A and male mold 8B thus configured
Is opened, and a parison P having a circular cross section (preferably a substantially elliptical flat parison having a major axis in the lateral width direction of the mold) is hung down to stand still, and then mounted on the outside of the left and right molds 8A, 8B. Operate the mold clamping cylinder (not shown),
Perform mold clamping. In the mold clamping process, first, as shown in FIG. 6, the backup surfaces 30B, 4
The molds 8A and 8B are stopped at a position where the tip of the bent portion of 0B comes close to the contact point. Then, after a certain cooling time has elapsed, the tack-off core 10 is further advanced by the operation of the hydraulic cylinder 10a, and as shown in FIG. 7, the backup surface 30B, on the back surface of the smooth surface 30A, 40A,
The tip of the bent portion of 40B is pressed and fused. In this way, by performing the forward operation in two stages, it is possible to prevent the thickness reduction of the smooth surfaces 30A and 40A due to the sink mark of the fusion-bonded portion. Of the molds 8 of the blow molding machine 1 in FIG. 5, the upper stage is for the backup panel 40 and the lower stage is for the front panel 30, but the upper stage is for the front panel and the lower stage is for the backup panel. As a result, it is rational that only the front panel that is frequently replaced due to panel exhaustion can be manufactured by shortening the hanging flat parison P. It is also possible to make production adjustments, such as producing more and less backup panels.

[0008]

As described above, according to the split formwork of the present invention, the front panel and the backup panel, which are the driving surfaces, can be easily attached and detached, the weight is small, the structural strength is large, and the handling is easy. Provide a low cost concrete pouring formwork. In addition, even if the driving surface is damaged, it can be replaced with a substitute without discarding the whole, so running costs can be reduced. Further, the method for manufacturing a split formwork of the present invention can easily and easily and simultaneously process the front panel and the backup panel simultaneously and in a single process.

[Brief description of drawings]

FIG. 1 is a perspective view of a resin mold showing an embodiment of the present invention.

FIG. 2 is a perspective view of a resin mold frame showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a resin mold showing an embodiment of the present invention.

FIG. 4 is a plan view of a resin mold according to an embodiment of the present invention.

FIG. 5 is an overall vertical cross-sectional view of a blow molding machine according to an embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an essential part for explaining a blow molding process of a resin mold according to the embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of an essential part for explaining a blow molding process of a resin mold according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of an essential part of a pin joint portion according to the example of the present invention.

FIG. 9 is a plan view of a pin joint portion according to the embodiment of the present invention.

FIG. 10 is a side view of a joining pin showing another embodiment of the present invention.

[Explanation of symbols]

 1 Blow Molding Machine 2 Die Head 3 Mandrel 3a Core 4 Extruder 6 Parison Cylinder 6a Parison Rod 7 Annular Space Passage 8 Mold 8A Female Mold 8B Male Mold 9 Platen 10 Tuck-off Core 10a Hydraulic Cylinder 20 Split Formwork 30 Front panel 30A Smooth surface 30B Backup surface 30C Side surface 40 Backup panel 40A Smooth surface 40B Backup surface 40C Side surface 40a Through hole 50 Joining pin 50a Wedge slit 50b Release step 52 Pin hole 52a Slit P parison (or flat parison) )

Claims (2)

[Claims] 1. A split formwork for blow molding of concrete, the split formwork comprising a front panel and a backup panel which are detachably integrated via a joining pin. One surface of both panels is formed as a smooth flat surface, a backup surface behind the one surface is formed in a bent corrugated shape, and the one surface and the backup surface are intermittently fused and integrated to each other. Is a hollow part, and a split formwork in which the backup surface of the front panel and the smooth surface of the backup panel are joined. 2. A pair of left and right molds, each of which is composed of a female mold having a smooth flat surface and a male mold having a plurality of tack-off cores that reciprocate in the mold advancing / retracting direction, are paired up and down. Arranged,
A blow molding machine for split formwork, wherein the front panel and the backup panel according to claim 1 are clamped / molded simultaneously from one flat parison.