GB/T 28251-2012 English PDF

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GB/T 28251-2012: The technical specifications for timing belt wheel hobs and timing belt mold hobs
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28251-2012	139	Add to Cart	3 days	The technical specifications for timing belt wheel hobs and timing belt mold hobs	Valid

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GB/T 33524.2   GB/T 5104   GB/T 972   GB/T 28248   GB/T 28249   GB/T 28247   

Basic data

Standard ID: GB/T 28251-2012 (GB/T28251-2012)
Description (Translated English): The technical specifications for timing belt wheel hobs and timing belt mold hobs
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J41
Classification of International Standard: 25.100
Word Count Estimation: 6,692
Quoted Standard: GB/T 28249; GB/T 28250
Regulation (derived from): Announcement of Newly Approved National Standards No. 1 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the pulley hob and hob with mold technical requirements, marking and packaging of the basic requirements. This standard applies by GB/T 28249 and GB/T 28250 machined pulley hob and hob with mold.

GB/T 28251-2012: The technical specifications for timing belt wheel hobs and timing belt mold hobs

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The technical specifications for timing belt wheel hobs and timing belt mold hobs ICS 25.100 J41 National Standards of People's Republic of China Pulley hob and belt hob 2012-03-09 release 2012-07-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Tool Standardization Technical Committee (SAC/TC91). The drafting unit of this standard. Harbin First Tool Manufacturing Co., Ltd. The main drafters of this standard. Dong Yingwu, Yu Jilong, Song Tiefu, Wang Jiaxi, Zhang Qiang, Sun Xianjun. Pulley hob and belt hob

1 Scope

This standard specifies the basic requirements for the technical requirements, marking and packaging of pulley hobs and die hobs. This standard is applicable to pulley hobs and die hobs machined according to GB/T 28249 and GB/T 28250.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 28249 pulley hob type and size GB/T 28250 with die hob type and size

3 technical requirements

3.1 The surface of the hob shall not be cracked, burnt and other defects that affect the performance. 3.2 hob surface roughness of the upper limit according to Table 1. Table 1 units are microns Check surface roughness parameters Surface roughness values Bore surface Axis end face Outer cylindrical surface Knife front Behind the teeth The top of the tooth Ra 0.63 1.25 0.63 3.3 hob outside diameter limit deviation by h15, the total length of the limit deviation by js15. 3.4 The main tolerances for hob manufacturing are as specified in Table 2. Table 2 units in millimeters No. Inspection item tolerance code Pitch Lt;/RTI & gt; tolerance 1 aperture limit deviation δD H6 2 Radial runout of the axis of the inner bore axis δdir 0.008 0.010 0.012 3 axis of the end of the hole on the axis of the round runaway δdix 0.006 0.008 0.010 ......

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