JPH05240731A - Method for sealing workpiece in pressing leak tester - Google Patents

Abstract

PURPOSE:To provide a method for sealing workpieces in a pressing leak tester capable of surely sealing the inside of each workpiece subjected to a pressing leak test. CONSTITUTION:In the first process, the side sealing member 2B(3B) of a side sealing plate 2(3) is pressed into contact with a workpiece W and the side portion of a base sealing plate 1 with a pressure smaller than a predetermined sealing pressure, the workpiece W being placed on the base sealing member 1B of the base sealing plate 1. In the second process, the bottom portion of the workpiece W is pressed into contact with the base sealing member 1B of the base sealing plate 1 with a predetermined sealing pressure. In the third process, the side sealing member 2B(3B) of the side sealing plate 2(3) is pressed into contact with the workpiece W and the side portion of the base sealing plate 1 with a predetermined sealing pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a work in a pressure leak tester configured to seal the inside of the work by pressing a seal plate against the work and closing the opening of the work. Regarding

[0002]

2. Description of the Related Art As shown in FIG.
When the pressure leakage test is performed on the work W having the open portion on one side, the work W is pressed against the base seal plate A to close the open portion at the bottom of the work W and the side seal plate B is used. And C for work W
And the side portion of the base seal plate A are pressed against each other to close open portions of both sides of the work W, thereby sealing the inside of the work W. The seal plates A, B, and C are provided on the surfaces of the plate bodies Aa, Ba, and Ca, respectively.
Corresponding to the shape of the opening edge portion in the release portion of the work W, string-shaped sealing members Ab, Bb, and C, respectively.
It is configured by installing b. The above-mentioned work W
After sealing the inside of the work, the work W is immersed in a test water tank (not shown) together with the seal plates A, B, C, and in this state, for example, air is pumped into the work W to observe the change in internal pressure. Then, a pressure leak test is performed on the work W by checking the work W for pressure leak.

[0003]

When the base seal plate A and the side seal plates B and C are pressed against the bottom and both sides of the work W in order to seal the inside of the work W, the side seals are attached. When the work W is pressed against the base seal plate A at a predetermined seal pressure prior to the plates B and C, or before the base seal plate A, the side seal plates B and C are fixed at the work W at a predetermined seal pressure. When pressed, as shown in FIG. 5 (a) or FIG. 5 (b), the seal member Ab of the base seal plate A and the seal member Bb (Cb) of the side seal plate B (C) meet. There is a slight gap H in the portion, and as a result, it is difficult to seal the inside of the work W. The present invention has been made in view of the above circumstances, and an object thereof is to provide a work sealing method in a pressure leak tester capable of reliably sealing the inside of a work to be subjected to a pressure leak test.

[0004]

Therefore, in the present invention, the first
In the step of, the side seal member of the side seal plate is brought into pressure contact with the work placed on the base seal plate of the base seal plate and the side portion of the base seal plate at a pressure smaller than a predetermined seal pressure, In the step, the bottom portion of the work is brought into pressure contact with the base seal member of the base seal plate at a predetermined seal pressure, and in the third step, the side seal member of the side seal plate is attached to the side portion of the work and the base seal plate. The above object is achieved by bringing them into contact with each other at a predetermined sealing pressure.

[0005]

By performing the above-described steps, the base seal member of the base seal plate and the side seal member of the side seal plate behave as if they were rubbed together at their joints, so that there is no gap between both seal members. It will come into close contact.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing an embodiment. 1 to 3 show an example in which a work sealing method according to the present invention is applied when a pressure leak test is performed on an engine cylinder block (cast product). As shown very schematically in FIGS. 2 and 3, the work (cylinder block) W has open portions at its bottom Wa and both sides Wb, Wc, respectively.
The pressure leak tester 100 includes a base seal plate 1 for closing the open portion, a side seal plate 2,
And a side seal plate 3.

The base seal plate 1 has a plate body 1A made of a metal material, and a base seal member 1B made of a plate-shaped rubber material having a thickness of 10 mm and a hardness of about 50 ° is provided on the upper surface of the plate body 1A. Is installed.

The outer dimension Lb of the base seal member 1B in the base seal plate 1 is determined by the plate body 1A.
Of the plate body 1A, and the outer dimension La of the plate body 1A is ± 1.5 mm with respect to the outer dimension Lw of the work W, that is, the plate body 1
It is set to allow a maximum step difference of 0.75 mm on one surface of A (base seal member 1B) and the work W.

On the other hand, the side seal plate 2 and the side seal plate 3 have plate bodies 2A and 3A, respectively, which are made of a metal material, and the plate bodies 2A and 3A have a thickness of 10 mm, respectively.
Side seal member 2 made of a plate-shaped rubber material with a hardness of about 40 °
B and 3B are installed.

The side seal plate 2 and the side seal plate 3 are pressed against the base seal plate 1 and the work W on the base seal plate 1 by hydraulic cylinder actuators (not shown), as will be described later. On the other hand, a clamp plate (not shown) is provided above the base seal plate 1, and the work W is pressed against the base seal plate 1 by the descending operation of the clamp plate.

In the pressure leak tester 100 having the above-described structure, in order to perform a pressure leak test on the work W, first, as shown in FIG. 1A, the bottom Wa of the work W is fixed to the base seal plate 1. While being placed on the base seal member 1B, the side seal member 2B of the side seal plate 2 is pressed against the side portion Wb of the work W and the side portion of the base seal plate 1, and
Side Wc of the work W and the base seal plate 1
The side seal member 3B of the side seal plate 3 is brought into pressure contact with the side portion of.

At this time, the side seal plate 2,
And the side seal plate 3 has a pressure P1a of about 1900N, which is smaller than a predetermined sealing pressure (about 11000N) described later.
Then, the work W and the side portions of the base seal plate 1 are pressed respectively. In addition, the area of the sealing surface by each side seal member 2B, 3B at this time is about 50 square cm.
And the surface pressure is about 4 kgf / square cm.

In this state, since only the weight of the work W is applied to the base seal member 1B,
The internal pressure of the side seal members 2B, 3B is larger than the internal pressure of the base seal member 1B. Therefore, as apparent from the figure, at the meeting portion between the base seal member 1B and the side seal members 2B, 3B, The side seal members 2B and 3B bite into the side portions of the base seal member 1B.

Next, by lowering the clamp plate (not shown), the work W is pressed with a predetermined seal pressure P2 of about 27,000 N as shown in FIG. 1 (b), and the bottom Wa of the work W is fixed to the base seal plate. The base seal member 1B of No. 1 is brought into pressure contact. The base seal member 1B
The area of the sealing surface is 140 square cm, and the surface pressure at this time is about 20 kgf / square cm.

In this state, the side seal members 2B, 3
The joining portion of the base seal member 1B that digs into the side portion of the base seal member 1B is pushed back to the side seal members 2B and 3B by the internal pressure of the base seal member 1B, and as is clear from the figure, the base seal member 1B. The central portion in the thickness direction of 1B is the side seal members 2B, 3
It will cut into the B side.

Thereafter, as shown in FIG. 1 (c), the side seal plate 2 is attached to a predetermined sealing pressure (about 110).
00N) P1, the side Wb of the work W and the side of the base seal plate 1 are brought into pressure contact with each other, and the side seal plate 3 is set to a predetermined seal pressure (about 11000N) P1.
Then, the side portion Wc of the work W and the side portion of the base seal plate 1 are brought into pressure contact with each other. The surface pressure of each side seal member 2B, 3B at this time is about 22 kgf / square cm.

In this state, the side seal member 2
By further increasing the internal pressures of B and 3B, the base seal member 1B and the side seal members 2B and 3B are pressed against each other with strong pressure, and as is clear from the figure, both seal members 1B, 2B, and 1B. And 3B are
Familiar with each other and meet closely.

In other words, the base seal member 1B and the side seal members 2 are processed through the above-mentioned steps.
B and 3B behave as if they were rubbed against each other at their joints, and finally they fit together and the two seal members come into close contact with each other without a gap, so that the inside of the work W is reliably sealed. Become.

The work W whose inside is completely sealed by the base seal plate 1 and the side seal plates 2 and 3 is immersed in a test water tank (not shown) together with the seal plates 1, 2 and 3, and In this state, compressed air is injected into the work W, and the leakage due to the work defect is inspected from the change in the internal pressure.

In the pressure leakage tester 100 of this embodiment, the base seal member 1B and the side seal member 2 are used.
Since B and 3B are each made of a plate-shaped rubber material having a low manufacturing cost, they are molded in a special shape that matches the sealing surface of the work. Therefore, a string-shaped sealing member having a high manufacturing cost is used. Significant cost reductions have been achieved compared to the conventional testing machines used.

Further, in this embodiment, the side seal plates 2 and 3 are brought into pressure contact with the work W placed on the base seal plate 1 at a pressure lower than a predetermined seal pressure,
The work W is pressed against the base seal plate 1 with a predetermined seal pressure, and the side seal plates 2 and 3 are pressed against the work W with a predetermined seal pressure. First, the work W on the base seal plate 1 is pressed. After pressing the side seal plates 2 and 3 with a pressure smaller than a predetermined seal pressure, the work W is attached to the base seal plate 1.
And pressing the side seal plates 2 and 3 against the work W are repeated a plurality of times while gradually increasing the pressure on the work W, and finally the work W is subjected to a predetermined sealing pressure at the base. The work W can be surely sealed by pressing the seal plate 1 and pressing the side seal plates 2 and 3 against the work W at a predetermined sealing pressure.

Further, the present invention can be effectively applied not only to the cylinder block of the engine shown in the embodiment but also to various works as a method of sealing the works to be subjected to the pressure leakage test. Needless to say.

[0023]

As described above in detail, in the method of sealing a work in the pressure leakage tester according to the present invention, the work mounted on the base seal member of the base seal plate and the base seal in the first step. The side seal member of the side seal plate is brought into pressure contact with the side portion of the plate at a pressure smaller than a predetermined seal pressure, and the bottom portion of the work is brought into pressure contact with the base seal member of the base seal plate at a predetermined seal pressure in the second step. Further, in the third step, since the side seal member of the side seal plate is brought into pressure contact with the side portions of the work and the base seal plate with a predetermined sealing pressure, the inside of the work is sealed. The base seal of the base seal plate The member and the side seal member of the side seal plate behave as if they were rubbed against each other at their joints, so that both seal members come into close contact with each other without a gap, thus ensuring the inside of the work subject to the pressure leak test. It becomes possible to seal it.

[Brief description of drawings]

1 (a), (b) and (c) are side views conceptually showing a pressure leak testing machine and a work, which sequentially show a method for sealing a work according to the present invention.

FIG. 2 is a conceptual perspective view showing a pressure leak tester for carrying out a work sealing method according to the present invention and a work.

FIG. 3 is a side view conceptually showing a pressure leak tester for carrying out a work sealing method according to the present invention and a work.

FIG. 4 is a conceptual perspective view showing a conventional pressure leak tester and a work.

FIG. 5 is a side view of essential parts showing a manner of installing a work by a conventional work sealing method.

[Explanation of symbols]

 1 ... Base seal plate, 1A ... Plate body, 1B ... Base seal member, 2, 3 ... Side seal plate, 2A, 3A ... Plate body, 2B, 3B ... Side seal member, 100 ... Pressure leak tester, W ... Work piece .

Claims (1)

[Claims] 1. A base seal member of a base seal plate is brought into pressure contact with a bottom portion of a work at a predetermined seal pressure, and a side seal member of a side seal plate is applied to a side portion of the work and the base seal plate at a predetermined seal pressure. By press contacting and closing each of the bottom and side openings of the work,
A method of sealing a work in a leak tester for sealing the inside of the work, wherein a side seal member in the side seal plate is placed in a state in which a bottom portion of the work is placed on a base seal member of the base seal plate, A first step of bringing the side portion of the work and the base seal plate into pressure contact with each other at a pressure smaller than the predetermined seal pressure; and a bottom portion of the work to the base seal member of the base seal plate at the predetermined seal pressure. And a third step of bringing the side seal member of the side seal plate into pressure contact with the side portion of the work and the base seal plate at the predetermined sealing pressure. A method for sealing a work in a pressure leak tester.