
Anyone with even rudimentary knowledge of the process chain or product life cycle knows that 80% of the production costs of a product come in the development and design phase. That’s why it’s advisable, if not imperative, especially with products consisting of several parts or components such as airplanes, automobiles, household and garden appliances etc., to research the ease of assembly and, increasingly, disassembly beginning in the development phase. The ProKon method, developed by the MTM Association in XXX has become widely accepted here and is, along with FMEA, a part of the production system in many companies. As an introduction to proper use, MTM offers public and company-intern seminars, which are enjoying growing popularity.
The term ProKon stands for “production-friendly design” and encompasses all methods of design for improving production. The two-day course focuses on the assembly division. ProKon is easy to learn and is conducted in a hands-on fashion. The participants are asked to bring components from their companies to examine for ease of assembly in the first step of the ProKon course (current state) and then in the second step (target state) to calculate rationalization potential. Data is documented on the ProKon analysis sheet, which is available as an Excel table or in TiCon®. “Assembly difficulties” occurring in the assembly process are systematically recorded on the analysis sheet and evaluated with predetermined ProKon units. These are dimensionless units, similar to RPZ (Risk Priority Numbers) with FMEA, which, in total, facilitate a statement about the quality of the design regarding suitability for assembly.
ProKon, in essence, describes the assembly process without accounting for the environment and possible work design measures. From this perspective there are a number of approaches for changing design (see Picture 1):
• Simplify components
• Support through positioning assistance and room for assembly
• Simplify assembly equipment and reduce assembly joints
• Standardize and reduce components
• Standardize fastening devices and torque
• Integrate parts and functions.
Christian Leitl, ProKon instructor and project engineer with extensive experience with ProKon workshops says of the target group: “We’re not just appealing to designers and product developers but, in keeping with the inter-division teamwork in the workshops, to employees in IE, production planning , production and quality assurance as well. Ideally it would be further complemented with employees from purchasing and sales. While most of the participants striving for the title of MTM Engineer at the public seminars have come from scheduling, at the company-internal courses it looks like around two thirds come from development and design and the rest from scheduling and production.
“We want to sensitize the designer and dispense with any existing reservations,” Christian Leitl adds. “He’ll see this after the ProKon workshops, which will be conducted more frequently at work, while implementing these ideas in their main jobs. But when he notices that everyone’s on board and the assembly-friendly design is secured, I find these reservations disappear rather quickly. Organizing these inter-division teams for maximum efficiency requires that everyone receive training in ProKon first.”
In a ProKon seminar in November 2009 in Stuttgart, the participants were able to learn more about ProKon using the real example of a component for an innovative automatic detergent dispenser. After a brief theoretical part introducing the topic and a few application rules, the group used the ProKon data sheet for a current-state analysis of the “detergent dispenser” component. They broke it down into its individual parts and analyzed each part for assembly difficulties. In the second step they developed a target state, which integrated all ideas for simplifying assembly.
According to the learning material, ProKon inspections usually reduce assembly time by 20-30%, a value which was also achieved in the course. In order to reach an “approximate” ProKon time from the calculated ProKon units, which have no dimension, convert the ProKon units to real time values. This time, however, includes only the primary area in the immediate surroundings of the assembly location as described on the analysis sheet for the component. The secondary area, with parts staging, layout design and work station environment are not accounted for.
The seminar finished as a success after two days, though not before the participants conducted a quick run-through of a current-state analysis for the two instructional examples: “PC mouse” and “blow-dryer.” Finally, thanks to everyone’s active participation as well as the professional and personal expertise of the ProKon instructors, the seminar was both intensive and entertaining, leaving the participants with many new insights.
Source: MTMaktuell Nº. 2010/01