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Production and Operation Management

In: Business and Management

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生產與作業管理期末報告
Case Study: Hot Spot Plastics Company
0013142陳品翔 0013116廖冠倫 0013148 邱聖凱 0013151 林梓洋

PARTⅠ
Company introduction: Hot Shot Plastics
Hot Shot Plastics, Inc. filed as an Articles of Incorporation in the State of California and is no longer active. This corporate entity was filed approximately fourteen years ago on Monday, June 05, 2000, according to public records filed with California Secretary of State.
Products:
Manufactures processed plastics Plastic cutting machinery, Plastic grinding machinery, Rubber or plastic mills, Rubber or plastic extrusion dies, Plastic injection molds, Thermoforming molds, Ejector pins, In mold decoration IMD cylinder, Blow molding machines, Coating machines, Extruders.

PARTⅡ
Case introduction:
Plastics keychains are being produced in a company named Hot Shot Plastics. The plastic material is first molded and then trimmed to the required shape. The curetimes (which is the time for the plastic to cool) during the molding process affect the edge quality of the keychains produced. The aim is to achieve statistical control of the curetimes using X̅- and R-charts.

Questions: 1. Prepare X̅- and R-charts using these data with the method described in the chapter.

Solution:

Factor for Determining from R̅ the Three-Sigma Control Limits for X̅- and R-Charts | | Factors for R-Chart | Number of observations in each samplen | Factor for X̅-ChartA2 | Lower Control LimitD3 | Upper Control LimitD4 | 4 | 0.73 | 0 | 2.28 |

X̅̅ = 30.40289
R̅ = 5.932155

Upper control limit for X̅ = X̅̅ + A2 R̅ = 30.40289 + 0.73 (5.932155) = 34.73336315
Lower control limit for X̅ = X̅̅ - A2 R̅ = 30.40289 - 0.73 (5.932155) = 26.07241685
Upper control limit for R = D4 R̅ = 2.28 (5.932155) = 13.5253134
Lower control limit for R = D3 R̅ = 0 (5.932155) = 0

Exhibit 1
LCL 26.07241685
X̅̅=30.40289
UCL 34.73336315

Exhibit

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