JPH03230919A - Manufacture of oil strainer - Google Patents

Abstract

PURPOSE:To obtain the producing process by which the oil strainer which has the fine welded surface with a net is effectively produced, while the dustlike fine pieces generated in producing process do not remain on a product by fixing and completing the net in the process which is continuous with the forming process of a pipe body. CONSTITUTION:First, inner molds 1, 2, 4 are collectably clamped to a main mold 3, and the cavity for molding a pipe body 11 is formed. Next, primary injecting resin is injected into the cavity and the pipe body 11 is molded. Simultaneously, the net- fixing flange part 14 which has an annular protrusion 15 is molded at the end of the pipe. Next, the inner molds 1, 2, 4 are retracted and shunted, and the net 20 is inserted between said inner molds in arrow direction from the opening 3A of the main mold 3. Then, the cylindrical inner mold 2 is lowered and pushes the flange 20A of the net. Secondary injecting resin is injected from the outside of the annular protrusion 15 in the state where said protrusion sinks into the net. After the completion of the product, the main mold 3 and the inner molds 1, 2 are divided, and the product is taken out. By this producing process, operational efficiency is heightened, metallic pieces or resin pieces do not remain on the product and the oil in use is not contaminated, whereby the appearance of the product is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an oil strainer, and more particularly, to a method of manufacturing an oil strainer that can be completed by fixing a mesh in a continuous step with forming a tube body. .

[Prior art and issues] 5. 6. FIG. 7 is a front view, a plan view, and a sectional view taken along the line 1--2 of FIG. 5, respectively, of a conventional product oil strainer 10.

11 is a pipe portion, 13 is a mounting flange portion, 1-4 is an assembly flange portion, 20 is a mesh, and 16 is a reinforcing rib.

This oil strainer 10 is used to suck up engine oil accumulated in the engine's oil pan to the oil pump, and also has the role of filtering out relatively large-diameter impurities in the oil such as metal pieces and sludge at an early stage. . Note that small diameter impurities in the oil are further filtered out by an oil filter.

Conventionally, this oil strainer has been made by injection molding the tube body from FRP (for example, glass fiber-filled nylon 6), then layering a circular convex flanged wire mesh made of stainless steel on the end of the tube and subjecting it to ultrasonic vibration or high-frequency heating. It was made by fusing it with the protrusion of the flange of the tube.

However, with such conventional methods, ■Molding and fusing are separate processes, resulting in poor work efficiency.

■Cuts of wire mesh and dust from synthetic resin fusion (fine scattered pieces)
remains on the product and contaminates the oil during use.

■The appearance of the fused surface is poor.

There were other problems, and the situation was not satisfactory.

Therefore, the inventors of the present invention have conducted extensive studies and conducted various experimental studies in search of more rational means to solve the above-mentioned problems (1), (2), and (3), and as a result, they have arrived at the present invention.

``Object of the Invention'' The object of the present invention is to provide a manufacturing method that can efficiently manufacture an oil strainer that does not leave any original minute particles left in the product during the manufacturing process and has a beautiful surface fused to the mesh.

[Structure of the Invention] According to the present invention, in a method for manufacturing an oil strainer in which a net is attached to a lower end flange of a tube, the step includes forming a tube with a flange portion having one or more annular projections by primary injection molding; A step of retracting the partial mold for forming the pipe body with the flange portion, a step of carrying the net onto the annular projection, and a step of pressing the net flange portion with the partial mold for forming the annular projection to partially crush the annular projection. and a step of joining the pipe flange part and the net flange part by secondary injection of fusion resin to the pipe flange part around the annular protrusion in a pressed state. A manufacturing method is provided.

In other words, the technical idea of the present invention is to maintain the temperature of the primary injection molded product (while it remains attached to one side of the mold).
In a soft state, a metal or synthetic resin net is pressed with appropriate pressure, and the annular protrusion pre-provided on the flange at the end of the tube sinks into the net, and the composite resin is fused to the outer periphery in a partially crushed state. The idea is to manufacture an oil strainer by secondarily injecting the oil and fixing the net.

The present invention will be described in detail below using Examples.

[Example] Fig. 1.2.3 is a sectional view of a mold structure showing the steps of an embodiment of the present invention, and Fig. 4 is an enlarged sectional view of a set joint.

1st. 2. 3. In Figure 4, ↑ and 4 are medium-sized pieces for making the tube end and tube body, respectively, and both can be slid up and down. Reference numeral 3 denotes a fixed main mold, and an opening 3A for carrying in the net is bored on the side. Main type 3 and medium size 1
A cylindrical middle mold 2 is inserted between the two, which has a sleeve shape and has an annular groove at its lower end for forming an annular protrusion and is vertically slidable. First, for the main type 3, the medium size 1. 2.4 are collectively clamped to form a cavity for molding the tube body 11, and then primary injection resin is injected into the cavity to mold the tube body 11. At the same time, an assembly flange portion 14 having an annular projection 15 is formed on the tube end.

Next, as shown in FIG. 2, the medium size 1. 2. 4 retreats, and during that time the net 20 closes the opening 3A of the main mold 3 in the direction of the arrow.
It is inserted (carried in) from At this time, it is important to arrange the mesh (in this case, a convex wire mesh made of stainless steel) so that the flange portion 2OA of the mesh 20 is exactly on top of the annular protrusion of the tube flange portion 11.

Then, as shown in FIG. 3, the cylindrical medium mold 2 descends and presses the net flange portion 2OA.

At this time, since the tubular body 11 has not yet passed after the primary injection, it is still in a warm semi-hard state, and the annular projection is easily partially crushed by being pressed down by the cylindrical medium mold 2 with an appropriate pressure.

In this manner, the secondary injection resin is injected from the outside of the annular projection 15 (the second resin injection port is not shown) with the projection recessed into the mesh as shown in FIG.

By doing this, since the protrusions are sunk into the gaps between the meshes, the secondary injection resin will not leak into the radially inner side of the annular protrusion 15.

Note that two or more annular protrusions 15 may be provided on a concentric circle.

In this case, if a discontinuous portion is provided in the outer annular projection, the secondary injection resin can easily enter and the net can be more firmly fused.

After the product is completed, the main mold 3 and middle molds 1 and 2 are separated and divided to take out the product.

By the way, regarding the load to make the protrusion sink into the net,
Assuming that the compressive strength of the primary injection resin is approximately 300 kg/cnL, the protrusion width is 1 mm, and the circumferential length is 150 mm, crushing begins at a total pressure of approximately 450 kg. Therefore, the objective can be achieved by applying a pressing force several times this amount. At this time, the thickness of the (gold) mesh is approximately 0. 141 of 6mm1 annular projection
was 0.5 to i, omm, and the height was also 0.5 to 1.0 mm.

The primary injection resin and the secondary injection resin (fusion resin) need only be able to be fused to each other, and may be the same resin or resins with different compositions.

[Effects of the Invention] By implementing the present invention, all of the above objects are achieved.

Zunawaji work efficiency is improved, no metal or resin pieces remain on the product-L, no oil is contaminated during use, and the product appearance is improved.

[Brief explanation of drawings]

1st. , 2. 3. Figure 4 is a cross-sectional view of an embodiment of the present invention.
Figures 5.6.7 are a front view, a plan view, and a sectional view taken along the line 1-2' of a conventional oil strainer. 10 Oil strainer, 11
Pipe body, 14 flange portion, 15 annular projection, 20 net, 21 secondary injection resin. Procedural amendment (spontaneous) 1゜Indication of case 1990 Patent Application No. 24750 2 Title of invention Method for manufacturing oil strainer

Claims (1)

[Claims] (1) A method for manufacturing an oil strainer in which a net is attached to a flange at the lower end of a pipe, including a step of forming a pipe with a flange having one or more annular projections by primary injection molding, and the pipe with a flange. a step of retracting the partial mold for forming the annular projection; a step of carrying the net onto the annular projection; a step of pressing the net flange portion with the annular projection forming partial mold to partially crush the annular projection; A method for manufacturing an oil strainer comprising the step of joining a pipe flange part and a net flange part by secondarily injecting a fusion resin to the pipe flange part around the annular projection.