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No.000308 Sheet Forming Machine
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78
Simplified bending/forming machine
Related Category
Shaft Supports
| Product name | Shaft Supports/Flanged Mount/Thick Sleeve |
|---|---|
| Part number | STHR20 |
| Features | Tapped Mounting Hole Type recommended when mounting the supports to thin plates |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select the long sleeve to support a long shaft.
Available sizes
■Shaft Supports - Flanged Mount with Thick Sleeve
| Material | Surface Treatment |
|---|---|
| EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating | |
| EN 1.4301 Equiv. | - |
| EN AW-6061 Equiv. | Clear Anodize |
■Sizes and Dimensions
| Shaft Bore Dia. | Overall Length | Guide O.D. | Flange O.D. |
|---|---|---|---|
| 3 | 10 | 8 | 22 |
| 4 | 10 | 9 | 24 |
| 5 | 12 | 10 | 25 |
| 6 | 15 | 12 | 28 |
| 8 | 16 | 12 | 28 |
| 10 | 20 | 14 | 30 |
| 12 | 24 | 16 | 36 |
| 13 | 18 | 38 | |
| 15 | 30 | 20 | 40 |
| 16 | 32 | 22 | 42 |
| 18 | 28 | 50 | |
| 20 | 28 | 50 | |
| 25 | 38 | 33 | 55 |
| 30 | 38 | 66 | |
| 35 | 50 | 45 | 80 |
| 40 | 60 | 90 | |
| 50 | 70 | 100 |
Accuracy Info
■Accuracy of Shaft Supports
| Shaft Bore Dia. | Tolerance (H7) |
|---|---|
| 3 | +0.010 0 |
| 4 | +0.012 0 |
| 5 | |
| 6 | |
| 8 | +0.015 0 |
| 10 | |
| 12 | +0.018 0 |
| 13 | |
| 14 | |
| 15 | |
| 16 | |
| 18 | |
| 20 | +0.021 0 |
| 25 | |
| 30 | |
| 35 | +0.025 0 |
| 40 | |
| 50 |
Perpendicularity of the Mounting Surface and the Shaft Bore: 0.02
Stopper Bolts with Urethane
| Product name | Stopper Bolts with Bumpers/Standard/Straight Shape |
|---|---|
| Part number | SUST8-50 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Selected to avoid shocks when stopping the rotation tip of the rotary actuator.
Available sizes
■Stopper Bolts With Urethane- Standard, Straight Shape
| Stopper | Hex Screw | Accessory (Hex Nut) | ||||
|---|---|---|---|---|---|---|
| Material | Hardness | Material | Strength Class | Surface Treatment | Material | Surface Treatment |
| Urethane (Black) | Shore A90 | EN 1.7220 Equiv. | 10.9 | Trivalent Chromate | EN 1.0038 Equiv. | Trivalent Chromate |
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | - | ||
| Low Repulsion Urethane (Gray) | Shore A70 | EN 1.7220 Equiv. | 10.9 | Bright Chromate Plating | EN 1.0038 Equiv. | Trivalent Chromate |
| Polyacetal (White) | - | EN 1.7220 Equiv. | 10.9 | Trivalent Chromate | EN 1.0038 Equiv. | Trivalent Chromate |
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | - | ||
| Silicon (Light Gray) | Shore A70 | EN 1.7220 Equiv. | 10.9 | Trivalent Chromate | EN 1.0038 Equiv. | Trivalent Chromate |
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | - | ||
■Sizes and Dimensions
| Screw Dia. (Coarse) | Threaded Section Length (Length under Head) |
|---|---|
| M3 | 15 - 40 (Increments of 5) |
| M4 | 15 - 40 (Increments of 5) |
| M5 | 15 - 50 (Increments of 5) |
| M6 | 20 - 50 (Increments of 5), 60 |
| M8 | 20 - 50 (Increments of 5), 60 |
| M10 | 20 - 50 (Increments of 5), 60, 70 |
| M12 | 30 - 70 (Increments of 10) |
Support Units
| Product name | Support Units/Round/Fixed Side |
|---|---|
| Part number | BRW12-SET |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Use for ball screws on the fixed side / support side set to shorten the design time.
Available sizes
■Support Units - Fixed Side, Round
| Material | Surface Treatment | |
|---|---|---|
| Bearing Housing Cover | Collar Bearing Nut | Bearing Housing |
| Cover | ||
| Collar | ||
| Bearing Nut | ||
| EN 1.1191 Equiv. | EN 1.0038 Equiv. | Black Oxide |
| Electroless Nickel Plating | ||
| Low Temp. Black Plating | ||
■Sizes and Dimensions
| Bearing I.D. | Fixed Side Length | Flange Dimension |
|---|---|---|
| 6 | 20 | □28 |
| 8 | 23 | □35 |
| 10 | 29 | □42 |
| 12 | □44 | |
| 15 | 32 | □52 |
| 20 | 52 | □68 |
| 25 | 57 | □79 |
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CAD Data Download (Unit Assembly)
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Assembly data shows the assembly drawings in the concept design phase. The sole purpose of the data is to explain the structure and functionality of the assembly and is not considered nor to be used as a final design.
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Application Overview
Purpose
- To roll the end portion of a resin sheet into a U shape.
Points for use
- After the operator sets a resin sheet on the machining table, pressing the start button (1) clamps the resin sheet, (2) rotates the roll bar by 180° (bending the resin sheet into a U shape), (3) starts leftward travel of the heater at 120mm/2.3 sec, (4) activates the heater ON timer, (5) moves the heater to the right end of the resin sheet, (6) performs heating travel on the resin sheet at 260mm/4.9 sec, (7) makes the heater travel at 20mm/0.4 sec, (8) stops the heater at the left end (stroke end), (9) starts rightward travel of the heater, (10) performs heating travel on the resin sheet, (11) turns the heater OFF (by timer operation), and (12) stops the heater at the right end. Optimum conditions such as heating and air blow performed in combination, heater stop during rightward travel, and air blow travel should be determined through trial and error.
Target workpiece
- Shape: resin film
- Size: 260 x 45 x t0.7mm
Design Specifications
Operating Conditions or Design Requirements
- Sheet clamp stroke: 100mm
- Sheet rotation angle: 180°
- Heater: 1kw
- Heater travel unit stroke: 474mm
- Travel time: 7.5sec (variable speed)
- Outer dimensions: W987 x D455 x H514mm
Required Performance
- Positioning accuracy: ±0.2mm
Selection Criteria for Main Components
- Selection of heater
- Heating temperature of 250°±30° adjustment by room-temperature compressed air blow (through trials and errors)
The hot air blow ON/OFF timing is determined by the timer activated during travel.
Heating time 15sec (in reciprocating operation)
- Heating temperature of 250°±30° adjustment by room-temperature compressed air blow (through trials and errors)
Design Evaluation
Verification of main components
- A motor with a torque that can withstand the load is selected.
- Load of table unit: M = 7kg
Lead of lead screw: L = 0.004m
Drive section efficiency: η = 0.26
Friction coefficient of guide: μ = 0.15
Motor startup torque TM = 0.28N･m
Rotation speed range of speed controller motor: n = 90 to 1400rpm
Motor rotation speed: N = 60 x V/L
= 60 x 53/4
≒ 800rpm
Load: F = μ x M x 9.8
= 0.15 x 7 x 9.8
= 10.3N
Load torque: T = FL/2πη
= 10.3 x 0.004/2 x 3.14 x 0.26
= 0.026N･m
Therefore, T < TM
- Load of table unit: M = 7kg
Other Design Consideration
- A cylinder with a guide is used for sheet clamping to reduce cost.
- For sheet rotation, a stopper is provided on the rotary actuator to make the bending amount adjustable.
- The heater is fixed with screw clamps for facilitating replacement, and as its traveling accuracy and stopping accuracy specifications are rough, lead screws and a small-size speed controller motor are used.
- The temperature of hot air is 450°C at the heater air blow port. To adjust the temperature, it is also equipped with an air blow nozzle.
- The heating time should be determined through trial and error. The heating time is around 15 seconds (reciprocation).
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