Wine bottle opener
From DDL Wiki
(→Failure Mode and Effects Analysis (FMEA)) |
(→Failure Mode and Effects Analysis (FMEA)) |
||
| Line 61: | Line 61: | ||
The main mechanical motion of the corkscrew is the translation-rotation of the screw (helicoidal motion). The translation motion comes from the rotation of the main handle. The link between those to components is a simple gear that transforms the rotation of the main handle into the vertical translation of the piece holding the screw. In order to lead the vertical motion of the screw, a metal cylinder moves up and down into a vertical hole. The screw moves through a joint in which a helicoidal track has been designed in order to ensure the rotation of the screw. | The main mechanical motion of the corkscrew is the translation-rotation of the screw (helicoidal motion). The translation motion comes from the rotation of the main handle. The link between those to components is a simple gear that transforms the rotation of the main handle into the vertical translation of the piece holding the screw. In order to lead the vertical motion of the screw, a metal cylinder moves up and down into a vertical hole. The screw moves through a joint in which a helicoidal track has been designed in order to ensure the rotation of the screw. | ||
| + | |||
| + | =Assembly= | ||
| + | |||
| + | [[Image:BOpiecesnumber.jpg]] | ||
= Failure Mode and Effects Analysis (FMEA) = | = Failure Mode and Effects Analysis (FMEA) = | ||
Revision as of 23:21, 31 January 2014
Contents |
Executive Summary
Product Stakeholders
We identified the major stakeholders as consumers (individual connoisseurs and restaurants), retailers, manufacturers and distributors (transportation and shipping companies). Listed below are the stakeholders associated with a corkscrew wine opener and the product's aspects they need as well as the some additional aspects they want.
| Stakeholder Needs and Wants | |||
|---|---|---|---|
| Stakeholder | Needs | Wants | |
| Consumers |
|
| |
| Retailer |
|
| |
| Manufacturer |
|
| |
| Distributor |
|
| |
Consumers need a product that is easy to understand and use but they want something that is aesthetically pleasing and cheap to buy. Retailers also need an aesthetically pleasing product as they are easier to sell, and they need a product that has a high profit margin. They usually want a product with a high market demand to get customers to their doorstep (or website). Add-ons such as a foil cutter and a table mount make the product even more desirable. Manufacturers usually try to cut costs associated with production so their product needs to have a simple mechanism with few moving parts. Ideally they would want to make their product from low cost materials with a cost effective manufacturing process. Distributors are concerned with transportation and shipping so they need a durable product that won't get damaged in transit. They want the product to be as light as possible to reduce transportation costs.
Product Use Study
First the user cuts the foils with the foil cutter. Second the user pushes the main handle down and then grabs the bottleneck with the two others handles. Third the user pulls the main handle up in order to make the screw penetrate the bottle cork. Fourth, the user pushes the main handle down again in order to take the cork out of the bottle. Fifth, the user takes the corkscrew away from the bottle, presses the two handles together and pulls the main handle up again in order to release the cork from the screw. Finally, the user is ready to enjoy the bottle he just opened.
Mechanical Description
The main mechanical motion of the corkscrew is the translation-rotation of the screw (helicoidal motion). The translation motion comes from the rotation of the main handle. The link between those to components is a simple gear that transforms the rotation of the main handle into the vertical translation of the piece holding the screw. In order to lead the vertical motion of the screw, a metal cylinder moves up and down into a vertical hole. The screw moves through a joint in which a helicoidal track has been designed in order to ensure the rotation of the screw.
Assembly
Failure Mode and Effects Analysis (FMEA)
Failure Mode and Effects Analysis (FMEA) in a design process is used to identify the potential failures that could occur with a product. It helps designers to know more precisely about the reliability of their product. They try to find out all the possible failures that a consumer may occur when using this product. They start by choosing an item and then they identify any potential failure mode related to this item. They also precise the effects and the cause of failure. Finally they try to find solutions to this failure mode in the design control and by recommending actions. On top of that, the failure mode is rated on three criteria: first on its severity, second on its occurrence and third on its detectability. In order to judge that, they use the following rating tables:
Here is the FMEA table that we filled for the product the dissected.
Table
| FMEA - Wine Bottle Opener | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Items and Function | Failure Mode | Effects of Failure | Severity | Causes of Failure | Probability of Occurrence | Design Control | Detectability | RPN | Recommended Actions |
| Handles - hold and squeeze the bottle | become loose | drop the bottle | 9 | drop the item, shipping damages, rubber is defective | 3 | Test the pins (fatigue) and test the rubber | 3 | 81 | make sure the rubber are well stuck in the handles |
| squeeze too hard | break the bottle | 7 | super strong user/defective rubber | 1 | testing resistance of a bottle and rubber | 3 | 21 | Write something in the manual about the strength that should be used | |
| lever arm pin - attaches the arm to the body | got broken or bent | lever arm gets detached from the body -> drop the bottle or self injury | 7 | too much force/torque applied, pin is not strong enough | 3 | test the pin | 1 | 21 | improve geometry (larger cross section) or better material selection |
| cork and screw - close the bottle | lever arm rotation stopped before the end | screw not deep enough into the cork -> cork may break | 4 | inappropriate use of the item | 3 | none | 2 | 24 | set a "stop click" which prevents to rotate backwards before a certain angle / write something in the manual |
| body - holds every component together | to broken or bent | item falls apart -> not usable anymore | 5 | drop the item, shipping damages | 3 | none | 2 | 30 | thicker sections / material selection |
| corkscrew - gets the cork out of the bottle | got broken | unusable | 5 | stuck in cork / drop the item / use the item at very low temperature | 2 | testing resistance of the corkscrew | 3 | 30 | include second corkscrew, make it easy to change the component, change material |
| got bet | doesn't run through the track anymore | 5 | hit the device during usage, try to get the cork out applying torque | 5 | 3 | 75 | |||
