JPS59199208A - Preparation of hollow parts - Google Patents

Abstract

PURPOSE:To make easy control of a float weight and to reduce preparing hour by a method wherein synthetic resin is injected into the clearance part connecting an inner and an outer joint of two parts to fix them firmly. CONSTITUTION:Half-finished members 10, 16 are inserted into molds 23, 24, both molds 23, 24 are butted against each other and a rodlike body 13 is inserted into a cylindrical body 18 until the end surfaces of both half-finished members 10, 16 are butted against each other. A nozzle 25 for injecting synthetic resin is set in these molds 23, 24, synthetic resin 26 injected from this nozzle 25 into the concave steps 12, 20 of both half-finished members 10, 16 reaches a cavity 21 through each concave groove 22 and the joining faces of both half-finished members 10, 16 are fixed firmly. A closed space 28 is formed in the float prepared in such manner, this space 28 is controlled to occupy a specified volume to obtain a predetermined buoyancy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing hollow shaped parts such as ganoline tank floats for automobiles, floats for chemical converters, and floats for oil stoves.

Generally, this type of industrial float must have excellent oil resistance and heat resistance due to its intended use, which limits the materials that can be used, and currently, foamed phenol, foamed nylon, etc. are used. There are various ways to manufacture this float, and various shapes are required depending on the usage situation of the float.Also, as an industrial float, the above-mentioned resistance is required, but it is already The reason: The important thing is that the amount of float needed to maintain the specified buoyancy is 4B. This weight (around control is float i)
This is the most important point in the Z4 manufacturing process, and it is required to control this weight.

Conventionally, industrial floats have been controlled by foamed foams made of foamed phenol, foamed nylon, etc.

ε(~1 Figure 1l-i Formed by foaming/Hyfloat (1) is shown in cross section.Central hole C2CK
is the rotary arm (not shown) 7) of the level detector. Controlling the volume of the float (1) with a stimulant such as foamed phenol and foamed nylon is unstable and difficult to control, and the foaming ratio (apparently a secret) I was under restrictions. That's why foaming agent is used! In order to form a stable industrial float without adding 1 filJ fJ to the sugar, we assume that the float is formed using only synthetic d1 fat, as shown in Fig. 2.

This is done by calculating the weight from the specific gravity of the synthetic resin used for a certain shape, and then removing an excessive amount from the inside of the shape according to the desired float weight.
to obtain the desired weight of the float (3). However, the float (3) must have a hole (5) in the center to insert the rotating arm, and if the float (3) is formed only from synthetic resin, as shown in Figure 3. The hollow parts (6) and (7) must be connected in some way, and in order to make a completely closed hollow part, the external (9), (9 and internal (8)
, (8 pieces must be joined, and regardless of whether the direction is X-X or Y-Y in Figure 3, the interior (8), (
It is quite difficult to join 8 ri. Furthermore, conventional foaming floats require a much longer time than the time required to form general parts made of synthetic resin. Generally, it is necessary to take 2 to 3 times the formation time for foaming, and the longer the formation time, the lower the productivity will naturally be. On the other hand, if the forming time is shortened, there is a problem in that foaming occurs from within the surface of the part (referred to as post-foaming) immediately after forming.

Therefore, the present invention has been made to solve the above-mentioned drawbacks, and the purpose of the present invention is to use a synthetic resin with excellent oil resistance and heat resistance, which is especially necessary for industrial floats, and to To provide a method for manufacturing hollow shaped parts that allows easy weight control and shortens manufacturing time.

Next, embodiments of the present invention will be described in detail with reference to FIG. 4 and the following drawings.

In the figure, (10 is a half member, this half member C1O is made of synthetic resin, and has an approximately cup-shaped outer shell portion (1υ).

A recessed step (U) is provided on the outer periphery of the end surface of the outer shell (II). On the other hand, a rod-shaped body (13) is integrally protruded from the center of the bottom of the outer shell (II). A tapered portion t14) is provided on the outer periphery of the tip of the rod-shaped body +13.
A through hole (19) is formed in the axis of the rod-shaped body 03, into which a rotary arm (not shown) of a level detector is inserted.

On the other hand, aO is a half member joined to the half member αO, and this half member α0 is also made of synthetic resin and has a substantially cup-shaped outer shell portion α. At the center of the bottom of this half member ae is a cylindrical body u.
8 are integrally provided in a protruding manner. The tip of this cylindrical body (18) is approximately flush with the end surface of the half member 00, and a tip portion α9 is provided on the inner periphery of the tip of the cylindrical body α frame.On the other hand,
The outer shell of the half member 00 (171 has a recessed step CO on the outer periphery of the end surface)
A cylindrical body 08 is provided on the outer surface of the outer shell part Q71.
A recess 12]) is formed around the opening of the recess Q, υ
and the recessed step portion 12G are continuous by four recessed grooves (C). Such a half part (1, Q + Oo as mold section)! [C], put both molds @, (241) together, and press the rod-shaped body 03 until the end faces of both halves (10°00) come into contact.
is inserted into the cylindrical body αυ (see Fig. 7). A synthetic resin injection nozzle) is installed in these molds (C) and (C), and this nozzle (C) is connected to both half members (10, a, e).
Synthetic resin is injected into the recessed step part (12, Ij (1) of (IG,
This is to fix the joint surface of αG.

FIG. 9 shows a float manufactured by the method for manufacturing hollow-shaped parts according to the present invention. This float (E) has a closed space formed therein, and this space is controlled so that it occupies a predetermined volume to obtain a predetermined buoyancy.

FIG. 10 shows another embodiment of the present invention, in which the weight of this float is approximately the same as the half member C! , lJ, G(2
have. This half member (311, lI'l) is a substantially cup-shaped outer shell, [has] this outer shell ur(l+i
A rod-shaped sentinel integrally protrudes from the center of the bottom of l, ([), a through-hole drilled in the axis of this rod-shaped body (d).
rA'3 is provided. Still outer shell C & j +
<(4!), and the end face of the rod-shaped body (-t) has a recessed step (33a), (34a)+ (35a)+ (
36a) is provided. This four-stage part (33a), (
3sa) is fitted with a ring-shaped lid body ■ν and θ.

A half member Gl in which such lid body ridges θ are fitted and connected, respectively.
), C3'2r was placed in a mold (not shown).
Then, the molds are butted against each other and both half members 13υ, 33 are brought into contact with each other. At this time, the rod-shaped body C9, (only the end face of the sword is in contact with it,
Both lids kuzuη.

Between (b) and between the end faces of the outer shell, → and [with], an i4 gap is formed. In this gap, a nozzle (
A synthetic resin (c) is injected into the gap (not shown), the inside of the gap is checked, and both half members 13]) and ea are fixed together. In this way, a float having a closed space (fh eiO) is obtained.

In addition, in the above embodiment, four grooves @ are provided, but
Even if there is only one or more grooves, or there is no groove (A), a separate nozzle etc. is used to form the groove C]
) may be injected with synthetic resin.

The present invention is constructed as shown above, in which a gap is formed in both parts to communicate the internal darkening part and the external joint, the two parts are brought into contact within the formwork, and then the gap is closed. In order to fix the inner and outer joints by injecting synthetic resin into the inner and outer joints, synthetic U (grease) can be applied to the inner and outer joints, so for example, each joint of two parts can be fixed, and the rotation of a level detector, etc. It is possible to form a hollow-shaped part having an arm insertion hole and a sealed space.In other words, according to the present invention, since a foaming agent is not used as in the conventional case, it is possible to form a hollow-shaped part that has an arm insertion hole and a sealed space. It is easier to control/troll, accurately obtain the volume of the space, and generate a predetermined buoyancy.Since synthetic resin is still used, manufacturing time can be shortened. It has good work efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional floats, Figure 1 is a cross-sectional view of a foam-molded float, Figure iJ52 is a cross-sectional view of a float molded with synthetic resin, and Figure 3 is an explanation showing the manufacturing process of the same float. The following figures show embodiments of the present invention: FIGS. 4 and 5 are new views of each half of the float, FIG. 6 is a side view of FIG. 5, and FIG. Figures and λ~8 figures are %
A cross-sectional view showing the manufacturing process; Figure 9 is a cross-sectional view of the float;
The go diagram is a 191-plane view showing another embodiment of the present invention. a old (le, C3η+ 'Bll...half member 09.
・7 verses・(arrogant...communicating hole CI!, :9.34)・
・Formwork (G)・(C)・・・Synthetic resin (Excellent)
・Float (sha), G→・0su...space part

Claims (1)

[Claims] In a method for manufacturing a hollow-shaped part formed by combining at least two parts, a gap is formed in both parts to communicate an internal joint part and an external joint part, and both parts are still brought into contact within a formwork. . A method for handling hollow-shaped parts, characterized in that a synthetic 4M resin is then injected into the gap to harden the inner and outer joints.