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No.000062 Sheet metal bending fixture
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Bending fixture which considers spring-back phenomenon.
Related Category
Toggle Clamps
| Product name | Horizontal Handle/Horizontal or Vertical Base Push-Pull Type |
|---|---|
| Part number | MC03-S1 |
| Features | Small clamps for light-duty operations with the horizontally-movable handles which are effective if there is an obstacle above. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Economical and suitable for obtaining predetermined load
Available sizes
■Toggle Clamp - Side Push-pull, Horizontal (Flange Base)
| Material | EN 1.0038 Equiv. | EN 1.4301 Equiv. | ||
|---|---|---|---|---|
| Surface Treatment | Main body: Trivalent chromate / Shaft: Nickel Plating | - | ||
| Stroke | 17 | 16 | 17 | |
| Tightening force (N) | 450 | 500 | 450 | |
| Weight (g) | 50 | 65 | 50 | |
| Open-Close Angle of Handle | 190° | 180° | 190° | |
| Main Body Width | 27 | 28 | 27 | |
| Overall Height (Fully Pushed Position) | 43.5 | 17 | 43.5 | |
| Overall Length (Fully Pushed Position) | 73.9 | 81.5 | 73.9 | |
| Handle Operating Direction | Fore and Aft | Right Turn | Left Turn | |
| Accessory | Rubber Tipped Bolt (NBR, Shore A70) | Stainless Steel Bolt | ||
* Please see the product pages for shape details and dimensions.
Long Knurled Head Screws
| Product name | Long Knurled Head Screws/Configurable Thread Length |
|---|---|
| Part number | LRLBF3-A20-L6-D5 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable for using as a thin knob with appropriate length
Available sizes
■Long Knurled Head Screws
| Material | Surface treatment |
|---|---|
| EN 1.7220 Equiv. | Electroless Nickel Plating |
| EN 1.4305 Equiv. | - |
■Sizes and Dimensions
| Under Head Screw Shaft | Knurled Shaft | ||
|---|---|---|---|
| Screw Dia. (Coarse) | Length (1mm increments) | O.D (1mm increments) | Length (1mm increments) |
| M3 | 6 ~ 40 | Ø5 ~ Ø10 | 10 ~ 60 |
| M4 | 6 ~ 40 | Ø5 ~ Ø10 | |
| M5 | 10 ~ 50 | Ø10 ~ Ø25 | |
| M6 | 10 ~ 50 | Ø10 ~ Ø25 | |
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Application Overview
Purpose
- Manual bending fixture.
- A sheet metal workpiece is clamped down by a toggle clamp on one side and bent horizontally by another toggle clamp on the opposite side. There is an additional vertical mechanism that applies a second bend vertically.
Points for use
- Manual sheet metal bending operation.
Target workpiece
- Sheet metal parts
Dims.: W10 x D27 x t0.5
Design Specifications
Operating Conditions or Design Requirements
- External dims.: W207 x D42 x H100
- Toggle clamp stroke: 14mm
- Spring-back countermeasure slide stroke (Vertical direction): 17.1mm
Required Performance
- Hardness of die, bending punch, and pusher is HRC58 or higher (EN 1.4125 Equiv. heat treated)
Selection Criteria for Main Components
- Toggle clamp
- Side push type is selected since a horizontal motion is needed.
- Clamping force on the sheet metal workpiece is needed therefore another toggle clamp is added.
- Clamping force on the bending side must exceed the required force to bend the workpiece.
Design Evaluation
Verification of main components
- Verify that the selected toggle clamp can withstand the required bending force.
- Bending force
- Count: C = 2.0
- Bend length: B = 5mm
- Thickness: t = 0.4mm
- Tensile strength: Ts = 270N/mm² (Material: Low Carbon Steel)
- Formula: Bending force P = (C / 3) x B x t x Ts = (2 / 3) x 5 x 0.4 x 270 = 360N
- Toggle clamp clamping force: 450N > Bending force: 360N
Other Design Consideration
- It may be necessary to bend more than 90 degrees due to spring-back phenomenon, apply force accordingly to material thickness and properties.
- A spring plunger was mounted to the vertical mechanism to prevent the vertical motion.
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