Dayton Die Cushions
6330 Industrial Dr, Eden Prairie Mn 55346, USA
dayton@daytondiecushions.com
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>>Products >>Learn about die cushions >>Topics >>Pin Pads

Pin Pad, also called wear plate, is the top plate of the die cushion that provides the support for die pins. The standard pin pad is made out of through hardened and ground steel. If pin pad needs to be particularly thick due to its size and/or cushion tonnage, it can be made out of mild steel with though hardened wear plate or strips mounted on top of it. The plate is hardened to prevent wear from die pins that ride on top of it.
Pin pads size is determined by the pin pattern. It has to be big enough to cover all the pin holes in the bolster plate. Standard pin pad sizes are defined with 3 dimensions: front-back, left-right dimension and circle diameter. They can be found in each die cushion model catalog. They are basically as big as the outer die cushion cylinder edge.

 
Catalogs
Model C
Model D
Model HC
Model HD
Model MC
Model MD
Model HMC
Entire Catalog
Pin pads can be designed to be bigger if the required pin pattern coverage area is larger than standard. They can be mounted independently to each die cushion or be common for two or more die cushions.
Common Pin Pad
Independent Pin Pad For Each Cushion
Pin pads can be designed to be bigger if the required pin pattern coverage area is larger than standard. They can be mounted independently to each die cushion or be common for two or more die cushions.
Pin pad's main function is to support die pins load, so deflection analysis is always perform to establish necessary plate thickness so that it deflection is minimized. The other important aspect of pin pad design and die cushion usage is appropriate die cushion loading. Die pins must always symmetrically load pin pad. Even with generous overlap and internal bronze guiding, die cushion cannot be used under off-center loading condition. Please refer to Off-Center Loading page for more information.
Also related to off-center loading is the maximum pin pad size that can be mounted on each die cushion. Is is defined by the amount of the overhang pin pad can have per side. It is the distance from die cushion edge to the pin pad edge. Based on that the maximum pin pad size is determined. For low pressure cushions, the maximum overhang per side is equal to 25% of die cushion diameter. This amount increases to 33% for high pressure cushions thanks to their internal bronze guiding. If pin pad is too big compared to die cushion size, even with symmetric die pin load, it can cause die cushion damage similar to one cause by off-center loading. Table below gives the maximum pin pad size for all die cushion series. It also includes common pin pad size for the bank of 2 and 3 die cushions.
C & D Models
1 Unit Max Size
2 Units Max Size
3 Units Max Size
C6 & D6
6.4 x 6.4
12.8 x 6.4
19.2 x 6.4
C8 & D8
8.5 x 8.5
17 x 8.5
25.5 x 8.5
C10 & D10
10.6
21.2 x 10.6
31.8 x 10.6
C12 & D12
12.7 x 12.7
25.4 x 12.7
38.1 x 12.7
C14 & D14
14.8 x 14.8
29.6 x 14.8
44.4 x 14.8
C16 & D16
17 x 17
34 x 17
51 x 17
C18
19.1 x 19.1
38.2 x 19.1
57.3 x 19.1
C20
21.2 x 21.2
42.4 x 21.2
63.6 x 21.2
C22
23.3 x 23.3
46.6 x 23.3
69.9 x 23.3
C24
25.5 x 25.5
51 x 25.5
76.5 x 25.5

 

MC & HCModels
1 Unit Max Size
2 Units Max Size
3 Units Max Size
MC8 & HC8
9.5 x 9.5
19 x 9.5
28.5 x 9.5
MC10 & HC10
11.9 x 11.9
23.8 x 11.9
35.6 x 11.9
MC12 & HC12
14.1 x 14.1
28.2 x 14.1
42.3 x 14.1
MC14 & HC14
16.5 x 16.5
33 x 16.5
49.5 x 16.5
MC16 & HC16
19 x 19
38 x 19
57 x 19
MC18 & HC18
21.2 x 21.2
42.4 x 21.2
63.6 x 21.2
MC20 & HC20
23.6 x 23.6
47.2 x 23.6
70.8 x 23.6
MC22 & HC22
26 x 26
52 x 26
78 x 26
MC24 & HC24
28.3 x 28.3
56.6 x 28.3
84.9 x 28.3
Additional Information
Die Cushion Tonnage
Press Tonnage
Tonnage for drawing shells