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- > No.000277 Workpiece Air Tightness Check Fixture
No.000277 Workpiece Air Tightness Check Fixture
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Checks air leakage by creating an air tight condition with a cylinder.
Relevant category
Fixture Slides
| Product name | Fixture Slides - Guide Rail Type |
|---|---|
| Part number | JGR250 |
| Features | High load capacity is achieved by use of guide rails. Suitable for high load applications, such as press-fitting, press and machining. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select the slide unit with guide for mounting/dismounting workpieces.
Available sizes
■Fixture Slides - Guide Rail Type
| Main Body | Material | Surface Treatment |
|---|---|---|
| Table | 1045 Carbon Steel Thermal Refined Material | Electroless Nickel Plating |
| Plate | ||
| Guide Rail | ||
| Handle Bracket | 1045 Carbon Steel | |
| Handle | Alum. Alloy | Clear Anodize |
■Sizes and Dimensions
| Type | Stroke (mm) | Table Size (mm) | Base Length (mm) |
|---|---|---|---|
| 150 | 50・100・150 | 150×150 | 325 |
| 250 | 150・200・250 | 150×150 | 425 |
Performance info.
■Speeds·Loads (Load info.) of Sliders for Fixture
| Type | Required Thrust （N) | Plunger Retaining Force (N) | Withstand Load (kN) |
|---|---|---|---|
| 150 | 10 | 30 | 37.2 |
| 250 | 10 | 30 | 37.2 |
Air Cylinder
| Product name | Air Cylinders - Pen, Double Acting |
|---|---|
| Part number | MSPCN20-50 |
| Features | Double Acting Type Cylinders - Compact and Pen-style - for increased space saving |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select the cylinder that has the thrust capable of pressing the lid for air tight test of workpiece.
Available sizes
■Air Cylinders - Pen, Double Acting
| Cyl. Bore | Cylinder Stroke | Cylinder O.D. | Overall Length (Listed below + St) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| St | 15 | 25 | 30 | 45 | 50 | 60 | 100 | |||
| φ6 | ○ | - | ○ | ○ | - | ○ | - | 12×12 | 77 | |
| φ10 | ○ | - | ○ | ○ | - | ○ | - | 12×12 | 74 | |
| φ16 | ○ | - | ○ | ○ | - | ○ | - | 18×18 | 75 | |
| φ20 | ○ | ○ | - | - | ○ | - | ○ | 28×28 | 131 | |
| φ25 | ○ | ○ | - | - | ○ | - | ○ | 33.5×33.5 | 142 | |
| φ32 | ○ | ○ | - | - | ○ | - | ○ | 37.5x37.5 | 155 | |
* Sensor is sold separately
Selection steps
■Cylinder Selection Steps
1. Define various conditions of the load.
↓
2. Calculate cylinder output (In case of double acting type)
↓
3. Determine the bore dia.
↓
4. Determine the theoretical reference speed.
↓
5. Verify the cylinder's cushion mechanism.
↓
6. Verify the lateral load applied to the cylinder.
Performance info.
■Compact Cylinder Operating Pressure Range
Min. Operating Pressure (MPa): 0.06
Max. Operating Pressure (MPa): 0.7
Pressure Resistance (MPa): 1.0
■Theoretical Thrust
(N)
| Cyl. bore | Operating Direction | Operating Pressure (MPa) | |
|---|---|---|---|
| 0.4 | 0.5 | ||
| φ6 | Push | 11.3 | 14.1 |
| Pull | 8.5 | 10.6 | |
| φ10 | Push | 31.4 | 39.3 |
| Pull | 26.4 | 33 | |
| φ16 | Push | 80 | 101 |
| Pull | 73 | 91 | |
| φ20 | Push | 126 | 157 |
| Pull | 94 | 118 | |
| φ25 | Push | 196 | 245 |
| Pull | 165 | 206 | |
| φ32 | Push | 322 | 402 |
| Pull | 346 | 415 | |
■Allowable Lateral Load
EPT Sealer® Sponge
| Product name | Dustproof General-Purpose Sponges |
|---|---|
| Part number | EPA-100-100-5 |
| Features | High performance sealing material that can fill all types of gaps to keep out heat, moisture and sound. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Provides an air tight seal
Risk info.
Cutting may be required to suit workpiece size.
Available sizes
■Dustproof General-Purpose Sponges
| Material | |
|---|---|
| Sponge | Seal |
| EPDM Foam (EPT Sealer®) | Adhesive with Unwoven Cloth Base Material |
| EPDM Foam (Opsealer®) | Adhesive with Net Base Material |
■Sizes and Dimensions
| 10 mm Increment | Thickness (Selectable) | |
|---|---|---|
| Long Length Direction | Short Length Direction | |
| 20～500 | 20～400 | 3 |
| 5 | ||
| 8 | ||
| 10 | ||
| 15 | ||
| 20 | ||
| 25 | ||
| 30 | ||
Accuracy Info
■Accuracy of EPT Sealer® Sponge
| Thickness | Tolerance |
|---|---|
| 3～10 | ±1.0 |
| 15～25 | ±2.0 |
| 30 | ±2.5 |
| External Dimensions | Tolerance |
|---|---|
| 20 | ±2.0 |
| 30～50 | ±2.5 |
| 60～140 | ±3.5 |
| 150～290 | ±6.5 |
| 300～500 | ±9.0 |
Performance info.
■Characteristic Value of EPT Sealer® Sponge
* The values are not guaranteed but measured ones.
| Measurement Item | EPA (Unwoven Cloth Base Material) | EPAOP (Net Base Material) | |
|---|---|---|---|
| Color | Black | Black | |
| Specific Gravity | 0.11 | 0.08 | |
| Tensile Strength | 0.08 | 0.1 | |
| Elongation (%) | 450 | 205 | |
| Compression Hardness (25%) (kg/cm²) | 0.02 | 0.04 | |
| Compression Hardness (50%) (kg/cm²) | 0.05 | 0.05 | |
| Compression Ratio (%) | 50 | × | △ |
| 60 | △ | ○ | |
| 70 | ○ | ○ | |
| 80 | ○ | ○ | |
○: No leakage of water after 30min.
△: Leakage of water is seen after 30min.
X: Leakage of water is seen within 10min.
IDEA NOTE Checks air leakage by creating an air tight condition with a cylinder.
Compresses the sheet mounted on the pusher by using cylinder thrust.
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Application Overview
Purpose
- Puts the workpiece in an air tight chamber. Air is blown in from external unit to check for air leakage in the weld on the workpiece.
- The sponge sheet acts as a stopper for the cylinder stroke.
Points for use
- A manual mechanism puts in and takes out the workpiece.
Target workpiece
- Heat-welded plastic cases.
- External dimensions: φ86 x 33mm
- Weight 80g
Design Specifications
Operating Conditions or Design Requirements
- Fixture slider stroke 250mm.
- Cylinder stroke 45mm
- External dimensions: W400xD430xH339mm
Required Performance
- Cylinder thrust 113N or more at operating pressure of 0.4MPa.
Selection Criteria for Main Components
- Cylinder
- Ensure the cylinder meets the required thrust.
Design Evaluation
Verification of main components
- Select the cylinder thrust from the counterforce at sheet compression.
- Cylinder
- Conditional values: Sheet compression stress p = 0.021MPa, sheet compression area S = 5408mm²
- Counterforce at sheet compression: R = p × S Thus, R = 0.021 × 5408 ≒ 113N
⇒Select a cylinder with a thrust of 126N.
Other Design Consideration
- Use of a fixture slider simplifies design.
- The cylinder needs to compress the EPT sealer sponge to 70% or less of its thickness to ensure being air tight.
- Installing a separate pressure gauge between the compressor and the corresponding equipment allows air leakage to be accurately detected.
- A cover is installed on the cylinder operating part for safety.
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