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Helpful application examples for mechanical engineers.
The Concept of inCAD Library
Online application library with a range of ideas for all manufacturing industries.
Save design time and learn new design applications when you are concepting new machines.
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Sucks and retails the work piece using a dry pump.
IDEA NOTE Safety is improved thanks to an area sensor.
The device is controlled using an area sensor so that is does not operate during work piece placement.
IDEA NOTE Two-hand control switch
The cylinder is actuated when the two buttons on the outside of the work space are pressed.
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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.
You will need to edit the Data so that it meets your specific design conditions.
Unit assembly Data consists of some sub-assemblies.
It is configured so that each sub-assembly unit can be used as it is or edited.
* The part in the frame is a sub-assembly unit.
The Data for fabricated parts is based on easy-to-edit dimensions and shapes in sketches and histories.
The Data including the third-part components are made by the Company.
* Unit assembly Data consists of some sub-assemblies.
It is configured so that each sub-assembly unit can be used as it is or edited.
Application Overview
Purpose
A device designed to hold a resin sheet in a cylindrical shape while the overlapping portions are being heat welded together.
Welding unit only advances from protective cover when buttons on each side of the unit are pressed simultaneously.
An indexing plunger is used to fix the rotary table into position.
Points for use
The resin work piece is placed manually.
Once workpiece is in position, the indexing plunger rotates the workpiece into welding position.
After the welding mechanism unit is retracted, the workpiece is removed from the top.
To prevent malfunctions and enhance safety, an area sensor is installed. Another safety measure is the welding unit will not emerge or heat until two buttons outside the workspace are pressed.
Target workpiece
Resin sheet
Outer dimensions: W335 x D405 x t0.1mm
Weight: 18g
Design Specifications
Operating Conditions or Design Requirements
Air cylinder stroke amount: 100mm <Maximum stroke amount: 100mm>
Outer dimensions W650xD675xH658mm
Required Performance
Cylinder thrust: 11.8N or higher
Selection Criteria for Main Components
Air cylinder
A compact cylinder is selected to save space.
Cartridge Heaters
A long cartridge heater that satisfies the heat quantity requirement for heat welding is selected.
Design Evaluation
Verification of main components
Cylindrical thrust is verified based on the workpiece load and the heat quantity required of the heater is verified based on the heating conditions.
Cylinder
Conditional value: mass to move: m = 4kg, friction coefficient μ = 0.3, load factor η = 0.5 (from catalog), outstroke pressure area A1 = 1256mm² (from catalog), operating pressure P = 0.4MPa
Load applied to cylinder: F = mgμ, hence, F = 4 x 9.8 x 0.3 = 11.8N,
Cylinder output F1 = load factor x outstroke pressure area x operating pressure, hence, F1 = 0.5 x 1256 x 0.4 = 251.2N -> Safety factor: F1/F = 251.2/11.8 ≈ 21
Heat quantity required of the heater
Conditional value: mass of heated workpiece: 0.585kg (A5052), specific heat of heated workpiece: 0.23kcal/kg°C, temperature rise: 190°C (heating until the temperature of heated workpiece reaches 210°C), heating time: 0.25h (idling), heating time: approx. 3 sec (workpiece), efficiency: 0.3 (standard specification: from catalog)
The workpiece heating time should be determined through trial and error because it depends on the size, thickness, and material of the workpiece.
Heat quantity required of heater H (kw) = mass of heated workpiece (kg) x specific heat of heated workpiece (kcal/kg°C) x temperature rise (°C)/(860 x heating time (h) x efficiency (η)), hence H = 0.585 x 0.23 x 190/(860 x 0.25 x 0.3) = 0.396kW = 396W
Other Design Consideration
For safety the heater is inside the cover except during welding.
To prevent injuries, the buttons to operate the heating element are placed outside the work space.
During work piece placement, wrap the work piece on revolution along the groves of the suction block, confirm the overlap is 5mm, and then manually rotate the suction block to the welding the position and fix into place with the plunger.
The material and shape of the welding portion are determined through trial and error. Each work piece will be different and depends of the material, thickness, and shape.
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