JB/T 3736.3-1994 Fluctuation chart, a statistical tool commonly used in quality management

This standard describes the composition, drawing and application of fluctuation charts. Fluctuation charts are used to observe and analyze the quality characteristic value compliance and fluctuation conditions in quality control in order to control and improve quality. JB/T 3736.3-1994 Fluctuation charts, commonly used statistical tools in quality management JB/T3736.3-1994 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 3736. 1~-3736. 8-- 94
Statistical tools commonly used in quality management
Published on December 9, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on October 1, 1995
Machinery Industry Standard of the People's Republic of China
Statistical tools commonly used in quality management
Fluctuation chart
Subject content and applicable scope
JB/T 3736.394
代禁JB3735.3—8-
This standard describes the composition of the fluctuation state, the system and the application, and is suitable for the improvement and analysis of the quality control in the passive quality control, and the control and reverse quality control chamber 2 is composed of the angle coordinate system in the core system of the fluctuation output teaching, the magic coordinates represent the oil receiving double measurement position or the time to use the dust mark to represent the quality value of the cabinet, the fluctuation curve falls according to the observation of the time, and the standard limit (or compression range limit) is shown on the work. See 1.
Figure 1 Figure
3 Use points
31 In the application of mechanical scheduling procedures in batch production, the H-wave diagram should be added. The coordinates must be scanned and the values ​​must be within the quality range. However, the coordinates are small positions that are determined by the quality standards. The lower limit of the sample must be within the specification. The lower limit of the sample must be within the specification. The difference between the size and the basic compensation system is in line with the technical requirements of the technique.
3.2 When applied to single-piece production, the machine must be restored to a normal sequence. The conditions must meet the "three countries\, that is, all machine tools in one room, the same production time or the same workers or equipment with the same technical level) have the same quality standards and basic adjustment requirements, and the parts are produced. The coordinate measurement value is collected by the serial number, and the crack barrier is marked as the relative value of the two quantities (return to the original). 3.3 The fluctuation of single-piece production machine should be calculated one by one when drawing the actual difference. Then the relative value of the difference should be calculated according to the relative value of the deviation. Then the relative value of the deviation should be calculated according to the relative value of the deviation. The relative value of the deviation should be calculated according to the relative value of the deviation. The actual lower limit difference is calculated according to the relative value of the deviation. The actual lower limit difference is calculated according to the relative value of the deviation. 3736.3-94
3.4 ​​Fluctuation diagram is mainly used to observe and analyze the fluctuation of quantity, and is effective for the five basic values ​​of prevention and control plan. The third part of the control limit can be determined in the country: the percentage of the tolerance band between the workpiece quality requirements can be selected. +Graphic analysis
-.1 The observation is within the specification limit and the two places are under control, the quality is stable, and the process is stable: see Figure 2. Figure
4.2 The observation is within the specification limit, and some parts are over-controlled. Although the quality is qualified, the fluctuation is large, and the process stability is poor, see Figure 7 Figure 3
4.3 The observation is not qualified within the specification limit, the fluctuation is large, and the stability is poor. See 1, JB/T 3736. 3-- 94
4.4 Although the measured values ​​are within the specified limits, the fluctuation is small, and the deviation from the center value is large. Figure 5. Figure 5
4. The measured values ​​are mostly within the specified limits, but the trend is decreasing. The process is unstable and the pressure is high. Figure 6
5 Application example
5.1 A single-piece production enterprise has a lathe and a lathe. It processes parts of different sizes of the same quality. The relative values ​​of the middle tolerance are recorded in the figure (see Figure ?): The limits in the figure must be the middle tolerance band: the lower limit. Take the lower limit as the tolerance and the upper limit as the tolerance of 0.
5.2 Draw and write the "Processing Quality Statistics Table 1". When the size of each part is the same, list them one by one in the table. 1 machine shop 260m continuous bed can be 1: quality statistics table No. 2
24c1.1.24
Y913-150f.3
Y913-1506.3
F#Ro+0.12
1±0,20
public lychee
Hangzhou innovation stem 3,
actual car R
comprehensive difference completed B
production sea number
Y919-1505.2
Y9131505.2
Y9.3-1563.2
Y9.3-153.2bzxz.net
Y0-3-1E02,2
Y9_3-150.2
Y913-15c0.2
r 9.3-1563.
T913-1565.3
Y0:3-1509.3
Y3318,8.36
Medical size
1*03+6.25
# 3ng+3.34
# 30g +.s4
5.3 Calculate the controlled deviation of machining dimension B
JB/I3736.3-94
Continued Table 1
Axiom T
Pull blood 5,
+c, 16
+center, 16
—0. 222
—0. 272
—0, 024
— 0. 02
Actual deviation
+o, 06
Relative to the positive,
In order to eliminate the quality characteristics within the middle tolerance band and avoid reducing defective products, the control deviation of machining dimension is calculated according to (2) as shown in the two previous days.
B-EL+T
Wu Zhong:
Drawing set size, tolerance:
EI—drawing given lower false difference
Control brush deviation coefficient,
JE/door 3736. 3- 94
According to the card example, 5.1 mm is set. The coupon is received cw0.! And 0.2. That is, BIC+02.
No. 1, the upper size and public base are 250-=.09, and the control deviation =.: S-.72
F—0+G.2 xC. c=G. 313
Then, fill in the control reserve difference into Table 1. 5.4 Measured value
After the operator processes according to the control deviation, measure the actual size of the processing, and record it in the 5th column of Table 1, such as No. 1: the actual deviation of the size after processing is +0.10. No. 2, the actual deviation is +0.10
5.5 Calculate the relative value of the deviation
formula (
calculate
such as No. 2,
such as No. 3.B,-
Enter the calculated value into the 6th column of Table 1,
5.6 Conclusion: Check the difference, which is also shown in the figure Dot, violate the curve (first circle 7). 5. Observation and analysis
5.7.1 The size deviation of serial number 1 is outside the tolerance range, which is a non-conforming item. E. .2 The size deviation of serial number 2 and serial number 3 is within the tolerance range, but outside the control limit, indicating that there are bad internal factors in the process. After finding the cause and making improvements, the passive network plays a monitoring and control role. 5. .3 The machine tool can process 20 different sizes. Most of the actual deviations are within the control limit, which is normal. The second order quality list is relatively stable.
Additional instructions:
JB/T3736. 3
Figure? China Baogong Fund Donation Effect Tour Effect Figure
This standard was proposed and assigned to the Ministry of Machinery Industry by the Ministry of Standardization Research Institute of Machinery Industry, Shanghai Road
This standard was drafted by Xiyang Hand-type Machinery Factory, the Ministry of Machinery Industry, the Ministry of Machinery Standardization Research Institute ...
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