This standard applies to sand mold steel castings, iron castings and nonferrous metal castings. JB/T 2435-1978 Casting process symbols and representation methods JB/T2435-1978 Standard download decompression password: www.bzxz.net

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JB/T2435
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(1) Parting line:
JB/T24351978
Casting process diagram (middle)
Indicated by red lines and the words "upper, middle, lower" are written in red. Two well boxes
Three open boxes
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Casting process diagram (B)
Indicated by thin solid lines and the words "middle, lower" are written in red. Two well boxes
Three open boxes
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(2) Parting line:| |tt||Casting process diagram (A)
Casting process diagram ()
Use thin solid lines to indicate, draw a "\" at either endUse red lines to indicate, draw a "" at either endExample
(3) Parting and parting lines
Casting process diagram (A)
Use red lines to indicate
(4) Parting negative numbers:
Casting process diagram (A)
Use red lines to indicate, and indicate the reduction in numerical value|| tt||Lower reduction
Upper and lower reduction
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Casting process diagram (B)
Indicated by thin solid lines
Casting process diagram (B)
Indicated by thin solid lines, and indicate the reduction valuecasti
CUpper reduction
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Lower reduction| |tt||Upper and lower reduction
(5) Machining allowance:
JB/T24351978
Casting process diagram (A)
Machining allowance can be indicated in two ways, either of which can be selected. a. Indicated by red line, indicate the machining allowance value near the machining symbol
b. Write the upper, side, and lower words in the process description to indicate the machining allowance value. Special machining allowance can be marked near the machining symbol .
For machining allowances with slopes, the slope should be indicated. Example
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Casting Process Diagram (B)
Machining allowances are indicated in two ways and you can choose either one. 8. The thick solid line indicates the rough wheel mat, and the double-dotted line indicates the shape of the part. Indicate the machining allowance value.
b. The thick solid line indicates the contour of the part. Write the words "upper", "side", and "lower" in the process description. The machining allowance value should be indicated. For machining allowances with slopes, the slope should be indicated. Example
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(6) Holes and slots that are not cast:
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Casting process drawing (A)
Hole or slot that are not cast are marked with red lines on the drawingExample
Casting process drawing (B)
Hole or slot that are not cast are not drawn in the drawing of the workpieceExample
(7) Process stop ：
Casting process diagram (A)
Represented by red line. Indicate the positive and negative process compensation values. Example
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Casting process diagram (Z)
The thick solid line represents the rough outline, the double-dotted line represents the part shape, and the positive and negative process compensation values ​​are indicated. China Foundry Network castings.net.cn Example
( 8) Riser:
JB/T24351978
Casting process diagram (A)
All kinds of risers are indicated by red lines, indicating the slope and dimensions of each part, and distinguished by serial numbers 1#, 2
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Casting process diagram (B)
All kinds of risers are indicated by thin solid lines. Indicate the slope and dimensions of each part, and distinguished by serial numbers 1#, 2 Distinguish
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(9) Riser cutting allowance:
Casting process diagram (A)
Indicated by red dotted line, indicating the cutting allowance value Example
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Casting process diagram (B)
Indicated by dotted line, indicating the cutting allowance value caseing s.net.cn
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(10) Subsidy:
JB/T24351978
Casting process diagram (A)
Indicated by red lines and indicating the dimensions of each part
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Casting process diagram (Art)
Indicated by thin solid lines and indicating the dimensions of each part
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Casting process diagram (A)
Indicated by red lines, indicating the dimensions of each part
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Casting process diagram (B)
Indicated by thin solid lines, indicating the dimensions of each part
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JB/T24351978
(12) Core number, boundary symbol and core head boundary: Casting process diagram (A)
The core head boundary is indicated by a blue line, and the core number is marked with Arabic numerals 1\, 2\, etc. The boundary symbol is generally only indicated by a small number with the same number as the core number at the junction of the core head and the core. The iron core must be written with the word "iron core"
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Casting process diagram (B)
The core head boundary is indicated by a thin solid line, and the core number is marked with Arabic numerals 1, 2*, etc. The boundary symbol is generally only indicated by a small number with the same core number at the junction of the core head and the core. The word "iron core" must be written on the iron core
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(13) Core head inclination and core head gap:| |tt||Casting process diagram (A)
Use blue lines to indicate the slope and gap values. Example
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Casting process diagram (B)
Use solid lines to indicate the slope and gap values. V.cattings.net.cn
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JB/T24351978
（ 14) The gap between the increase and decrease of the core and the core: The casting process diagram (A) is indicated by a blue line, indicating the increase and decrease and the gap value, or indicating it in the process description. The casting process diagram (Yi) is indicated by a thin solid line, indicating the increase and decrease and the gap value, or indicating it in the process description.
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