Stock Strip Layout: Percentage Utilization = 56.5%
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Stock Strip Layout 7. Design of Press working Tools
Nageswara Rao Posinasetti
1
February 6, 2012
2
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 3
February 6, 2012
Since, the components are to be ultimately blanked out of a stock strip, hence , precaution is to be taken while designing the dies for utilizing as much of stock as possible. It is also necessary in progressive dies, to ensure continuous handling of the scrap on the die block, which means that the scrap strip should have sufficient strength.
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 4
February 6, 2012
Percentage utilization = 56.5%
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 5
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 6
February 6, 2012
1
Percentage utilization = 56.5%
Percentage utilization = 56.5%
Percentage utilization = 73.5% Percentage utilization = 73.5%
Percentage utilization = 76%
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 7
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 8
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 9
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 10
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 11
February 6, 2012
February 6, 2012
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 12
February 6, 2012
2
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 13
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 14
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 15
February 6, 2012
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 16
February 6, 2012
18
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 17
February 6, 2012
3
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
5
Sheet Metal Die Design Procedure
31
February 6, 2012
33
February 6, 2012
Step 1: Decide the tentative sequence of operations.
Sheet Metal Die Design Procedure
32
Step 1: Decide the tentative sequence of operations. Step 2: Layout the stock strip, preferably using at least three part templates. Step 3: Establish centre line of pressure. Step 4: Establish location of pilot hole punches. Step 5: Decide on the punches to be used and their placement from the strip layout. Step 6: Make preliminary layout of die block. Step 7: Locate and design any finger, swing type, or automatic stops.
Step 8: Selection of best die set, total design considered. Step 9: Make adequate provisions for scrap disposal. Step 10: Decide best keying methods. Step 11: Check for good dowelling practice. Step 12: Make punch plate sufficiently thick to support all punches adequately. Step 13: Decide upon stripper and shedders and requirements.
February 6, 2012
34
February 6, 2012
Step 2: Layout the stock strip, preferably using at least three part templates.
35
February 6, 2012
36
February 6, 2012
6
Step 3: Establish centre line of pressure.
Centre Line of Pressure
37
February 6, 2012
38
Shearing should be symmetrical about the axis of the ram. This ensures no side thrust. To do this, the point on the die block is to be found out, through which the resultant of all the shearing forces is acting and this is coincided with the ram axis. This point is called the centre line of pressure. (c) TMH New Delhi, Manufacturing Technology Vol 1, Foundry, Forming and Welding by P N Rao
6 February 2012
Step 4: Establish location of pilot hole punches.
39
(c) TMH New Delhi, Manufacturing Technology Vol 1, Foundry, Forming and Welding by P N Rao
6 February 2012
40
February 6, 2012
42
February 6, 2012
Step 5: Decide on the punches to be used and their placement from the strip layout.
41
February 6, 2012
7
43
February 6, 2012
44
February 6, 2012
46
February 6, 2012
48
February 6, 2012
Step 6: Make preliminary layout of die block.
45
February 6, 2012
Step 7: Locate and design any finger, swing type, or automatic stops.
47
February 6, 2012
8
49
February 6, 2012
50
February 6, 2012
51
February 6, 2012
52
February 6, 2012
53
February 6, 2012
54
February 6, 2012
9
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
10
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February 6, 2012
63
February 6, 2012
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February 6, 2012
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February 6, 2012
66
February 6, 2012
11
Nageswara Rao Posinasetti
1
February 6, 2012
2
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 3
February 6, 2012
Since, the components are to be ultimately blanked out of a stock strip, hence , precaution is to be taken while designing the dies for utilizing as much of stock as possible. It is also necessary in progressive dies, to ensure continuous handling of the scrap on the die block, which means that the scrap strip should have sufficient strength.
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 4
February 6, 2012
Percentage utilization = 56.5%
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 5
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 6
February 6, 2012
1
Percentage utilization = 56.5%
Percentage utilization = 56.5%
Percentage utilization = 73.5% Percentage utilization = 73.5%
Percentage utilization = 76%
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 7
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 8
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 9
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 10
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 11
February 6, 2012
February 6, 2012
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 12
February 6, 2012
2
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 13
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 14
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 15
February 6, 2012
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 16
February 6, 2012
18
February 6, 2012
Fig. From P. N. Rao, Manufacturing Technology, Tata McGraw Hill, 1998. 17
February 6, 2012
3
19
February 6, 2012
20
February 6, 2012
21
February 6, 2012
22
February 6, 2012
23
February 6, 2012
24
February 6, 2012
4
25
February 6, 2012
26
February 6, 2012
27
February 6, 2012
28
February 6, 2012
29
February 6, 2012
30
February 6, 2012
5
Sheet Metal Die Design Procedure
31
February 6, 2012
33
February 6, 2012
Step 1: Decide the tentative sequence of operations.
Sheet Metal Die Design Procedure
32
Step 1: Decide the tentative sequence of operations. Step 2: Layout the stock strip, preferably using at least three part templates. Step 3: Establish centre line of pressure. Step 4: Establish location of pilot hole punches. Step 5: Decide on the punches to be used and their placement from the strip layout. Step 6: Make preliminary layout of die block. Step 7: Locate and design any finger, swing type, or automatic stops.
Step 8: Selection of best die set, total design considered. Step 9: Make adequate provisions for scrap disposal. Step 10: Decide best keying methods. Step 11: Check for good dowelling practice. Step 12: Make punch plate sufficiently thick to support all punches adequately. Step 13: Decide upon stripper and shedders and requirements.
February 6, 2012
34
February 6, 2012
Step 2: Layout the stock strip, preferably using at least three part templates.
35
February 6, 2012
36
February 6, 2012
6
Step 3: Establish centre line of pressure.
Centre Line of Pressure
37
February 6, 2012
38
Shearing should be symmetrical about the axis of the ram. This ensures no side thrust. To do this, the point on the die block is to be found out, through which the resultant of all the shearing forces is acting and this is coincided with the ram axis. This point is called the centre line of pressure. (c) TMH New Delhi, Manufacturing Technology Vol 1, Foundry, Forming and Welding by P N Rao
6 February 2012
Step 4: Establish location of pilot hole punches.
39
(c) TMH New Delhi, Manufacturing Technology Vol 1, Foundry, Forming and Welding by P N Rao
6 February 2012
40
February 6, 2012
42
February 6, 2012
Step 5: Decide on the punches to be used and their placement from the strip layout.
41
February 6, 2012
7
43
February 6, 2012
44
February 6, 2012
46
February 6, 2012
48
February 6, 2012
Step 6: Make preliminary layout of die block.
45
February 6, 2012
Step 7: Locate and design any finger, swing type, or automatic stops.
47
February 6, 2012
8
49
February 6, 2012
50
February 6, 2012
51
February 6, 2012
52
February 6, 2012
53
February 6, 2012
54
February 6, 2012
9
55
February 6, 2012
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February 6, 2012
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February 6, 2012
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February 6, 2012
10
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February 6, 2012
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February 6, 2012
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February 6, 2012
11
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