Control Chart Using .NET






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USL/LSL Control Chart using .NET for Quality Control
Introduction
Nowadays, automobile industry is interested in automated measuring machines to ensure quality and to compete in the global industry. Control Chart takes a major role in ensuring quality by measuring automobile components. The purpose is to make a simple Control Bar Chart for Measuring Systems like Camshaft, Crankshaft, and Master Setting, and so on. A digital sensor is used for measuring Camshaft and Crankshaft. Then the measured data is analyzed using the Control Chart .
Control Chart(ref)
The Control Charts are graphs which is used to check the quality of control of a process. In Control charts, UCL/LCL or USL/LSL will be used to check with the resultant data. If Measurement data is within the range of limits, then the process is OK(GOOD)
. If the Measurement data is above or below the limits, the process is NG(NOT GOOD)
.
- OK (GOOD) -> USL <= Measurement Data >= LSL
- NG (NOT GOOD) -> Upper Range -> Measurement Data > USL
- NG (NOT GOOD) -> Lower Range -> Measurement Data < LSL
In my simple Control Chart, USL /LSL is used for verifying the data.USL
-> Upper Specification Limit and LSL -> Lower Specification Limit. Note in this sample, I have used USL/LSL.
Difference between USL/LSL and UCL/LCL.
(The UCL or upper control limit and LCL or lower control limit are limits set by your process based on the actual amount of variation of your process.)
The USL or upper specification limit and LSL or lower specification limit are limits set by your customer's requirements. This is the variation that they will accept from your process. Reference)
I have been working on several automation projects. Instead of using third-party tools, I planned to create a simple program using .NET for creating a USL/LSL Control Bar chart for master setting. The main purpose of this article is to share what I have developed to other members.
I have created a Control Chart as a User Control so that it can be used easily in all projects.
In this article, I have attached the zip file named as SHANUControlChart_SRC.zip which contains:
- "SHANUControlChart_CNT" folder (This folder contains the Control Chart User control Source code.)
- "SHANUControlChart_DEMO" folder (This folder contains the Demo program which includes the Control Chart user control with Random Measurement sample using Timer control).
Using the Code
- First, we will start with the User Control. To create a user control:
- Create a new Windows Control Library project.
- Set the Name of Project and Click Ok (here, my user control name is
SHANUControlChart_CNT
). - Add all the controls which are needed.
- In code behind, declare all the
public
variables andPublic
property variables. Here, USL/LSL/Nominal and Measurement DataPublic
property has been declared which will be used to pass the data from the windows application.'Public Property Declaration Public Property MasterData() As String Get Return lblMasterData.Text End Get Set(value As String) lblMasterData.Text = value End Set End Property Public Property USLData() As String Get Return lblUslData.Text End Get Set(value As String) lblUslData.Text = value End Set End Property Public Property LSLData() As String Get Return lblLslData.Text End Get Set(value As String) lblLslData.Text = value End Set End Property Public Property NominalData() As String Get Return lblNominalData.Text End Get Set(value As String) lblNominalData.Text = value End Set End Property
- In my User control, I have used
Timer
control to always check for the Measurement data and produce the Bar Chart. In user control Load, I have Enabled and Start the Timer. In Timer Tick Event, I called the Function "LoadcontrolChart()
". In this function, I set all USL/LSL and measurement data and draw the Chart control.Public Sub LoadcontrolChart() Try 'For Bar and GageLoad upperLimitChk = False lowerLimitchk = False errLimtchk = False Dim pointVal As Integer Dim calcvalues As Double Dim calcvalues1 As Double ' Dim upperValue As Double Dim hasread As Integer Dim UpperRange As Double Dim err As String pointVal = 3 Dim ival As Integer sensordata = Convert.ToDouble(lblMasterData.Text.Trim()) frmMasteringPictuerBox.Refresh() upperValue = System.Convert.ToDouble(lblUslData.Text) lovervalue = System.Convert.ToDouble(lblLslData.Text) If upperValue = lovervalue Then lovervalue = lovervalue - 1 End If inputValue = System.Convert.ToDouble(lblMasterData.Text) 'here we call the draw rectangle function drawRectanles(barheight, barwidth, upperValue, lovervalue, loverInitialvalue, upperInititalvalue, xval, yval) Catch ex As Exception End Try End Sub
In this method, we check the Measurement data with USL and LSL Limit Value. If Measurement data is within the range of USL and LSL, then the resultant output will be Ok. I have used the
if
condition to check the resultant values as below:''This method is to draw the control chart Public Sub drawRectanles(ByVal barheight As Double, ByVal barwidth As Double, _ ByVal uppervalue As Double, ByVal lovervalue As Double, _ ByVal loverinitialvalue As Double, ByVal upperinitialvalue As Double, _ ByVal xval As Double, ByVal yval As Double) Try Dim limitsline As Double Dim lowerlimitline As Double Dim underrange As Double Dim upperrange As Double Dim differentpercentage As Double Dim totalheight As Double Dim inputvalueCal As Double Dim finaldisplayvalue As Double Dim backColors1 As Color Dim backColors2 As Color 'this is for the range percentage Calculation differentpercentage = uppervalue - lovervalue differentpercentage = differentpercentage * 0.2 'Upper range value upperrange = uppervalue + differentpercentage 'Lover range value underrange = lovervalue - differentpercentage totalheight = upperrange - underrange 'For Upper Limit ''limitsline = barheight * 0.2 - 10 limitsline = lovervalue - underrange limitsline = limitsline / totalheight limitsline = barheight * limitsline + 10 'For Lower Limit lowerlimitline = uppervalue - underrange lowerlimitline = lowerlimitline / totalheight lowerlimitline = barheight * lowerlimitline + 10 'lowerlimitline = barheight - limitsline + 10 'for finding the rangedata inputvalueCal = inputValue - underrange finaldisplayvalue = inputvalueCal / totalheight finaldisplayvalue = barheight * finaldisplayvalue Dim g As Graphics = frmMasteringPictuerBox.CreateGraphics Dim f5 As Font f5 = New Font("arial", 22, FontStyle.Bold, GraphicsUnit.Pixel) ''If condition to check for the result and display ''the chart accordingly depend on limit values. If inputValue = "0.000" Then If zeroDisplay = 0 Then backColors1 = Color.Red backColors2 = Color.DarkRed Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 90, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("NG -> UnderRange", f5, a5, System.Convert.ToInt32(xval) - 40, _ barheight + 24) lblMasterData.ForeColor = Color.Red frmMasteringlblmsg.Text = "NG -> UnderRange" Else backColors1 = Color.GreenYellow backColors2 = Color.DarkGreen Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 90, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("OK -> Good", f5, a5, _ System.Convert.ToInt32(xval) - 40, barheight + 24) lblMasterData.ForeColor = Color.GreenYellow frmMasteringlblmsg.Text = "OK -> Good" End If ElseIf inputValue >= lovervalue And inputValue <= uppervalue Then backColors1 = Color.GreenYellow backColors2 = Color.DarkGreen If upperLimitChk = False Then backColors1 = Color.GreenYellow backColors2 = Color.DarkGreen lblMasterData.ForeColor = Color.GreenYellow Else backColors1 = Color.Red backColors2 = Color.DarkRed lblMasterData.ForeColor = Color.Red End If Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("OK -> Good", f5, a5, System.Convert.ToInt32(xval) - 40, barheight + 24) frmMasteringlblmsg.Text = "OK -> Good" 'frmMasteringlblOrignalData.ForeColor = Color.GreenYellow ElseIf inputValue < lovervalue Then backColors1 = Color.Red backColors2 = Color.DarkRed Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("NG -> UnderRange", f5, a5, System.Convert.ToInt32(xval) - 40, _ barheight + 24) lblMasterData.ForeColor = Color.Red 'frmMasteringlblOrignalData.ForeColor = Color.Red frmMasteringlblmsg.Text = "NG -> UnderRange" ElseIf inputValue > uppervalue Then backColors1 = Color.Red backColors2 = Color.DarkRed Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("NG -> UpperRange", f5, a5, System.Convert.ToInt32(xval) - 40, _ barheight + 24) lblMasterData.ForeColor = Color.Red 'frmMasteringlblOrignalData.ForeColor = Color.Red frmMasteringlblmsg.Text = "NG -> UpperRange" Else backColors1 = Color.Red backColors2 = Color.DarkRed Dim a5 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), backColors1, backColors2, _ Drawing.Drawing2D.LinearGradientMode.Horizontal) g.DrawString("Not Good", f5, a5, _ System.Convert.ToInt32(xval) - 40, barheight + 24) lblMasterData.ForeColor = Color.Red frmMasteringlblmsg.Text = "Not Good" End If Dim apen As New Pen(Color.Black, 2) g.DrawRectangle(Pens.Black, System.Convert.ToInt32(xval) - 2, _ System.Convert.ToInt32(yval) - 2, System.Convert.ToInt32(barwidth) + 3, _ System.Convert.ToInt32(barheight) + 3) g.DrawLine(apen, System.Convert.ToInt32(xval) - 15, _ System.Convert.ToInt32(limitsline), _ System.Convert.ToInt32(xval), System.Convert.ToInt32(limitsline)) g.DrawLine(apen, System.Convert.ToInt32(xval) - 15, _ System.Convert.ToInt32(lowerlimitline), _ System.Convert.ToInt32(xval), System.Convert.ToInt32(lowerlimitline)) Dim a1 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), _ Color.Blue, Color.Orange, Drawing.Drawing2D.LinearGradientMode.Horizontal) Dim f As Font f = New Font("arial", 10, FontStyle.Bold, GraphicsUnit.Pixel) g.DrawString((String.Format("{0:N3}", CDbl(uppervalue.ToString))), _ f, a1, System.Convert.ToInt32(xval) - 40, _ System.Convert.ToInt32(limitsline) + 1) g.DrawString((String.Format("{0:N3}", CDbl(lovervalue.ToString))), _ f, a1, System.Convert.ToInt32(xval) - 40, _ System.Convert.ToInt32(lowerlimitline) + 1) g.DrawString((String.Format("{0:N3}", CDbl(upperrange.ToString))), _ f, a1, System.Convert.ToInt32(xval) - 40, 9) g.DrawString((String.Format("{0:N3}", CDbl(underrange.ToString))), _ f, a1, System.Convert.ToInt32(xval) - 40, barheight + 10) Dim a As New System.Drawing.Drawing2D.LinearGradientBrush(New RectangleF_ (xval, barheight + 10, barwidth, finaldisplayvalue + 1), backColors1, _ backColors2, Drawing.Drawing2D.LinearGradientMode.Vertical) Dim a2 As New System.Drawing.Drawing2D.LinearGradientBrush_ (New RectangleF(0, 0, 100, 19), _ Color.Black, Color.Black, Drawing.Drawing2D.LinearGradientMode.Horizontal) Dim f2 As Font f2 = New Font("arial", 12, FontStyle.Bold, GraphicsUnit.Pixel) If inputValue >= upperrange Then g.FillRectangle(a, New RectangleF(xval, 10, barwidth, barheight)) g.DrawString((String.Format("{0:N3}", CDbl(inputValue.ToString))), _ f2, a2, System.Convert.ToInt32(xval) + 40, yval - 8) ElseIf inputValue <= underrange Then g.FillRectangle(a, New RectangleF(xval, barheight + 10, barwidth, 4)) g.DrawString((String.Format("{0:N3}", CDbl(inputValue.ToString))), _ f2, a2, System.Convert.ToInt32(xval) + 40, barheight + 10) Else g.FillRectangle(a, New RectangleF_ (xval, barheight - finaldisplayvalue + 10, barwidth, finaldisplayvalue)) g.DrawString((String.Format("{0:N3}", CDbl(inputValue.ToString))), _ f2, a2, System.Convert.ToInt32(xval) + 40, _ barheight - System.Convert.ToInt32(finaldisplayvalue)) End If ' End If g.Dispose() Catch ex As Exception End Try End Sub
- After completion save, build and run the project.
- Now we create a Windows application and add and test our "
SHANUControlChart_CNT
" User Control.- Create a new Windows project.
- Open your form and then from Toolbox > right click > choose items > browse select your user control DLL and add.
- Drag the User Control to your windows form.
- Place all the USL/LSL and Measurement Textbox for input from the user. In Manual check button click pass all the data to user control using the
public
property as below:private void btnDisplay_Click(object sender, EventArgs e) { shanuControlChart.USLData = txtusl.Text; shanuControlChart.LSLData = txtLSL.Text; shanuControlChart.NominalData = txtNominal.Text; shanuControlChart.MasterData = txtData.Text; }
- In my demo program, I have used the
Timer
for the random sample Measurement data result checking. I have used the "btnRealTime
" as Toggle button. When clicked for the first time, Enable and Start the Timer and same button is clicked again, Stop the Timer. When timer is Started, I have generated a random number and pass the different data to user control and check for the chart result.private void btnRealTime_Click(object sender, EventArgs e) { if (btnRealTime.Text == "Real Time Data ON") { btnRealTime.Text = "Real Time Data OFF"; btnRealTime.ForeColor = Color.Red; timer1.Enabled = true; timer1.Start(); } else { btnRealTime.Text = "Real Time Data ON"; btnRealTime.ForeColor = Color.DarkGreen; timer1.Enabled = false; timer1.Stop(); } } // Timer Tick Event to check for the different random sample Measurement test data. private void timer1_Tick(object sender, EventArgs e) { Random rnd =new Random(); Double rndval = rnd.Next(1, 20); txtData.Text = rndval.ToString("0.000");//FormatNumber(rndval.ToString(), 3, , 0) shanuControlChart.USLData = txtusl.Text; shanuControlChart.LSLData = txtLSL.Text; shanuControlChart.NominalData = txtNominal.Text; shanuControlChart.MasterData = txtData.Text; }
Conclusion
The main aim of this article is to create a simple and standard Control Bar Chart user control for the automobile industry.
History
- 2014/07/14: Initial release