русский
|
Raw casting basic dimension
(mm)
|
General Casting Tolerance in mm |
|||||||||||||||||
| over |
up to and
including
|
Casting tolerance grade CT | ||||||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |||
|
—
10
16
|
10
16
25
|
0.09
0.1
0.11
|
0.13
0.14
0.15
|
0.18
0.2
0.22
|
0.26
0.28
0.3
|
0.36
0.38
0.42
|
0.52
0.54
0.58
|
0.74
0.78
0.82
|
1
1.1
1.2
|
1.5
1.6
1.7
|
2
2.2
2.4
|
2.8
3
3.2
|
4.2
4.4
4.6
|
—
—
6
|
—
—
8
|
—
—
10
|
—
—
12
|
|
|
25
40
63
|
40
63
100
|
0.12
0.13
0.14
|
0.17
0.18
0.2
|
0.24
0.26
0.28
|
0.32
0.36
0.4
|
0.46
0.5
0.56
|
0.64
0.7
0.78
|
0.9
1
1.1
|
1.3
1.4
1.6
|
1.8
2
2.2
|
2.6
2.8
3.2
|
3.6
4
4.4
|
5
5.6
6
|
7
8
9
|
9
10
11
|
11
12
14
|
14
16
18
|
|
|
100
160
250
|
160
250
400
|
0.15
—
—
|
0.22
0.24
—
|
0.3
0.34
0.4
|
0.44
0.5
0.56
|
0.62
0.7
0.78
|
0.88
1
1.1
|
1.2
1.4
1.6
|
1.8
2
2.2
|
2.5
2.8
3.2
|
3.6
4
4.4
|
5
5.6
6.2
|
7
8
9
|
10
11
12
|
12
14
16
|
16
18
20
|
20
22
25
|
|
|
400
630
1000
|
630
1000
1600
|
—
—
—
|
—
—
—
|
—
—
—
|
0.64
—
—
|
0.9
1
—
|
1.2
1.4
1.6
|
1.8
2
2.2
|
2.6
2.8
3.2
|
3.6
4
4.6
|
5
6
7
|
7
8
9
|
10
11
13
|
14
16
18
|
18
20
23
|
22
25
29
|
28
32
37
|
|
|
1600
2500
4000
6300
|
2500
4000
6300
10000
|
—
—
—
—
|
—
—
—
—
|
—
—
—
—
|
—
—
—
—
|
—
—
—
—
|
—
—
—
—
|
2.6
—
—
—
|
3.8
4.4
—
—
|
5.4
6.2
7
—
|
8
9
10
11
|
10
12
14
16
|
15
17
20
23
|
21
24
28
32
|
26
30
35
40
|
33
38
44
50
|
42
49
56
64
|
|
| The dimensional tolerances for lost wax investment casting of water glass processed are according CT4 - CT7. | ||||||||||||||||||
1. What Casting Tolerances Could Your Sand Castings Achieve?
The casting tolerances are divided into Dimensional Casting Tolerances (DCT) and Geometrical Casting Tolerances (GCT). Our foundry would like to talk with you if you have special request on the required tolerances. Here in the following are the general tolerances grade we could reach by our green sand casting, shell mould casting and no-bake furan resin sand casting:✔ DCT Grade by Green Sand Casting: CTG10 ~ CTG13
✔ DCT Grade by Shell Mold Casting or Furan Resin Sand Casting: CTG8 ~ CTG12
✔ GCT Grade by Green Sand Casting: CTG6 ~ CTG8
✔ GCT Grade by Shell Mold Casting or Furan Resin Sand Casting: CTG4 ~ CTG7
2. What Casting Tolerance Could Your Foundry Reach by Investment Casting?
According to the different binder materials used for making the shell, the investment casting could be divided into silica sol casting and water glass casting. The silica sol investment casting process have better Dimensional Casting Tolerances (DCT) and Geometrical Casting Tolerances (GCT) than water glass process. However, even by same casting process, the Tolerance Grade will be different from each cast alloy due to their various castability. Our foundry would like to talk with you if you have special request on the required tolerances. Here in the following are the general tolerances grade we could reach both by silica sol casting and water glass casting processes separately:✔ DCT Grade by Silica Sol Lost Wax Casting: DCTG4 ~ DCTG6
✔ DCT Grade by Water Glass Lost Wax Casting: DCTG5 ~ DCTG9
✔ GCT Grade by Silica Sol Lost Wax Casting: GCTG3 ~ GCTG5
✔ GCT Grade by Water Glass Lost Wax Casting: GCTG3 ~ GCTG5
3. What Casting Tolerances Could be Reached by Shell Mold Casting Process?
As we mentioned in the casting tolerance for sand castings, the shell mold castings have much higher accuracy and tighter tolerance than sand casting. Here in the following are the general tolerances grade we could reach by our shell mould casting and no-bake furan resin sand casting:✔ DCT Grade by Shell Mold Casting or Furan Resin Sand Casting: CTG8 ~ CTG12
✔ GCT Grade by Shell Mold Casting or Furan Resin Sand Casting: CTG4 ~ CTG7
4. What Casting Tolerances Could be Reached by Lost Foam Casting Process?
Generally speaking, the casting tolerances of lost foam castings are better than sand casting, but worse than shell mold casting and no-bake casting processes. For our foundry, we basically could achieve the following casting grades. But we would like to talk with you the specific castings and then decide what numbers we can provide for you.✔ DCT Grade by Lost Foam Casting: CTG9 ~ CTG13
✔ GCT Grade by Lost Foam Casting: CTG5 ~ CTG8
