with DBChart1 do begin
        with BottomAxis do begin
            Automatic := False;
            Minimum := -1;
            Maximum := 30;
            Increment := 1;
        end;
    end;

X軸
procedure TForm1.Button1Click(Sender: TObject);
begin
   DBChart1.LeftAxis.Automatic := False;    
   DBChart1.LeftAxis.Maximum := 2000;
   DBChart1.LeftAxis.Minimum := 500;
   DBChart1.LeftAxis.Increment := 150;
end;        Y軸
procedure TForm1.Button1Click(Sender: TObject);
begin
   DBChart1.RightAxis.Automatic := False;    
   DBChart1.RightAxis.Maximum := 600;
   DBChart1.RightAxis.Minimum := 500;
   DBChart1.RightAxis.Increment := 20;
end;