SEL MANUFAKTUR

Ketegori umum sel manufaktur Traditional stand-alone NC machine tool Single NC machine cell or minicell Integrated multimachine cell FMS

Traditional Stand-Alone NC Machine Tool Storage dan pergantian tool otomatis terbatas Dioperasikan secara tradisional, satu mesin satu operator Umumnya, beberapa mesin NC dikelompokkan dalam suatu sel manufaktur part family Pengelompokkan ke dalam sel bisa berupa beberapa mesin dioperasikan oleh seorang operator

Traditional Stand-Alone NC Machine Tool

Single NC Machine Cell Dicirikan oleh sebuah automatic work changer dengan work pallet yang ditugaskan permanen atau sebuah sistem conveyor- robot arm terpasang di depan mesin, ditambah dengan ketersediaan bulk tool storage Terdapat banyak variasi mesin

Single NC Machine Cell

Integrated multimachine cell Terdiri dari banyak dan ragam metal-cutting machine tools, yang memiliki antrian part-part, baik di depan cell atau di depan tiap mesin Multimachine cells dilayani oleh material handling robot, khususnya untuk produksi volume tinggi dengan famili part kecil dan desain yang stabil Sebagai penggantin robot, part-part diberikan pallet untuk berpindah antar mesin pada in- line system dengan dua atau tiga mesin, khususnya diterapkan pada produksi dengan volume dan variasi rendah atau tinggi

Integrated Multi Machine Cell

Unattended Machining Pemesinan tanpa operator Pertanyaan terkait: Jenis material part Lama operasi tanpa operator Provisi diperlukan Jaminan mesin bekerja tanpa masalah Tipe part berbeda dapat dikerjakan tanpa operator Pekerjaan persiapan tambahan diperlukan sebelum pemrosesan

Perbedaan utama sel manufaktur otomatis (SMO) dengan FMS SMO tanpa kendali komputer pusat dgn real time routing, load balancing and production scheduling logic. SMO mempunyai keterbatasan kapasitas tool SMO mempunyai flesibilitas yang lebih rendah dari FMS

Perbandingan Detil antara Sel dan FMS Cell FMS Low flexibility High flexibility Small stored part program inventory and accessibility Large stored part program inventory and accessibility Limited on-line computing power and decision -making software High on-line computing power and decision making software Low to moderate equipment and resource costs High equipment and resource costs Limited flexibility and variety of parts produced High flexibility and variety of parts produced Low to medium preparation and implementation rquirements High preparation and implementation requirements Benefits narrow but easily identified and quantified Benefits broad but hard to identify and quantify Moderate justification complexity and difficulty with mid-management approval required Difficult and complex justification process with high-level approral required Moderate level of management commitment and support required High level of management commitment and support required

Perbandingan Detil antara Sel dan FMS Cell FMS Low staffing and training impact High staffing and training impact Moderate effect a on other internal operations and organizations High effect on other internal operational and organizations Low to moderate risk and complexity, minimal facility changes High risk and complexity, many facility changes or new facility required Short planning to implementation cycle Long planning to implementation cycle Quick and practical learning curve and implementation cycle Lenghty and involved learning curve and implementation cycle Generally no tool delivery; limits system scope and flexibility Generally tool delivery and tool management; opens systems scope and flexibility Possibility of violating cell integrity by "stripping out" underutilized equipment to handle excess capacity during times of peak load conditions Not likely to violate FMS integrity and strip out equipment due to inherent flexibility and centralized computer control of the system Phased cellular growth may take too long and obsolete equipment before full integration FMS complete system and total part spectrum planned and implemented in turnkey installation

Kemampuan FMS Kemampuan mengidentifikasi dan membedakan masukan tipe part atau produk berbeda yang diproses sistem Kemampuan melakukan pergantian cepat berbagai instruksi operasi (a quick changeover of operating instructions) Kemampuan melakukan pergantian cepat berbagai set-up fisik (a quick changeover of physical set-up)

Pengujian Tingkat Fleksibilitas Sistem Part variety test—can the system process different part styles in a non-batch mode? Schedule change test—can the system readily accept changes in the production schedule, either in the product mix or the expected production volume? Error recovery test—can the system recover gracefully from equipment malfunctions and breakdowns, so that production is not completely disrupted? New part test—can new part designs be introduced into the existing product mix with relative ease?

Keputusan Uji Fleksibilitas The system is flexible if we can answer “yes” to all of these questions, with the most important criteria for flexibility being numbers 1 and 2. Numbers 3 and 4 are softer criteria that may be implemented at various levels

Analisis Fleksibilitas SMO dengan dua machine tools dan robot

Analisis Fleksibilitas SMO dengan 2 Mesin dan Robot The automated manufacturing cell with two machine tools and robot shall be considered flexible if it: (1) can machine different part mixes taken from the carousel by the robot; (2) allows for changes in the production schedule, without affecting the operation of the robotic arm and the two machine tools; (3) is able to carry-on operating even if one machine tool breaks down; and (4) can accommodate new part designs if the numerical control programme to do so is written off-line and then downloaded by the system for execution.