JB/T 5106-1991 Basic dimensions of core heads for casting molds

This standard specifies the basic dimensions and positioning forms of core heads for casting patterns. This standard applies to wooden patterns, metal patterns and plastic patterns for wet, dry, resin sand and water glass sand self-hardening sand molds in sand casting (machine molding or hand molding). JB/T 5106-1991 Basic dimensions of core heads for casting patterns JB/T5106-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Casting pattern core head
1 Subject content and scope of application
Basic dimensions
JB/T 5106
This standard specifies the basic dimensions and positioning forms of core heads for casting patterns. This standard is applicable to wooden patterns, metal patterns and plastic patterns for self-hardening sand molds such as wet molds, dry molds, resin sand and water glass sand in sand casting (machine molding or manual molding).
2 Terminology
2.1 Horizontal core head
The core head placed horizontally when closing the box is a horizontal core head. 2.2 Vertical core head
The core head placed vertically when closing the box is a vertical core head. 3 Core head size
Horizontal core head (see Figure 1)
Figure 1 Horizontal core head
3.1.1 The length of the horizontal core head of the wet, dry and self-hardening sand molds shall comply with Figure 1 and Table 13.1.2 The fitting clearance between the top surface of the horizontal core head and the core seat of the wet, dry and self-hardening sand molds shall comply with Figure 1 and Table 2. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 15, 1991 and implemented on July 1, 1992
JB/T5106--
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JB/T 5106--91
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JB/T 5106--91
The horizontal core head inclination and the fitting clearance between the core head and the core seat shall conform to Figure 1 and Table 3. 3.1.3
Core head height
Core head inclination》
Horizontal core head inclination and the fitting clearance between the core head and the core seat>63~
Note: The value of the clearance S can be calculated as (1.5～2)S. 3.2 Vertical core head (see Figure 2)
>100～
>160~～
Figure 2 Vertical core head
3.2.1 The height of the vertical core head and the gap between the core head and the core seat shall comply with Figure 2 and Table 4.198
1>400~
JB/T 5106--91
011~06
1001--08
001~08
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JB/T5106-·91
If the ratio of core height to diameter is greater than 2.5, the lower straight core head should be enlarged (see Figure 3. 3. 2. 1. 1
Figure 3 Enlarging the Lower Core Headwww.bzxz.net
When 1:2.5,
D,-(1.5~2)DD≤0.8D.
3.2.2 The inclination of the straight core head shall comply with Figure 2 and Table 5. Table 5 Vertical core head inclination
Core position
Upper core head
Lower core head
>40~63
>63-100
Core head inclination
3.2.3 The fitting clearance between the top surface of the vertical core head and the core seat shall comply with Figure 2 and Table 6.8
Table 6 Fitting clearance between the top surface of the vertical core head and the core seat D4-B
Sand mold category
Self-hardening sand mold
>63~≥100~
>1000/21 600
Note: The clearance between the bottom surface of the core head and the core seat can be considered as follows: 0~1.5mm for wet mold; 0~3mm for dry mold; 0~.2mm for self-hardening sand mold. JB/T5106-91
Appendix A
Dimensions of clamping ring, clamping half ring, anti-pressure ring, sand collecting groove and chamfer (supplementary part)
A1 To prevent metal liquid from entering the vent hole of wet mold, it should be vertical to the core. A clamping ring is made on the top surface of the upper core head (see Figure A1); a clamping half ring is made on the upper core head surface of the horizontal core (see Figure A2). A2 An anti-pressure ring should be made on the core head of the horizontal dry mold and self-hardening sand mold (see Figure A2). A3 In order to prevent the core from scratching the core seat surface during assembly and causing part of the molding sand to fall into the core seat, a sand collecting groove should be made on the lower vertical core seat soil of the wet mold, dry mold and self-hardening sand mold (see Figure A1); a chamfer should be made on the horizontal core head (see Figure A2). A4 The dimensions of the clamping ring, clamping half ring, anti-pressure ring, sand collecting groove and chamfer should comply with Figure A1, Figure A2 and Table A1. +
Pressure ring
Model core head
Sand collecting
Pressure half ring
Anti-pressure ring
Vertical core head
Model core head
Figure A2 Horizontal core head
Model core head diameter
63--160
160~250
>250～400|| tt||JB/T5106—91
Pressure ring, pressure half ring, anti-pressure ring, sand collecting groove and chamfering ruler
Appendix B
Positioning form of vertical core head and horizontal core head (supplement)
The positioning form of horizontal core head and vertical core head is shown in Table B1 and Table B2Table B1
Reference form of horizontal core head positioning
,5 ~0,81
Prevent rotation around horizontal
Prevent rotation around horizontal
Scope of application
D>200mm
Positioning form
JB/T 5106—91
Continued Table B1
Prevent rotation about the horizontal
axis and
Prevent movement along the horizontal
direction
Prevent rotation about the horizontal
axis and
Prevent movement along the horizontal
direction
Reference form of vertical core head positioning
Positioning form
Prevent rotation about the vertical axis
Scope of application
D Unrestricted
Unrestricted
Applicable range
Small core head height
0≥70mm
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