JB/T 5247.3-1999 This standard is a revision of ZB J62 019-89 "Accuracy of Desktop Presses". This standard is part of the JB/T 5247 "Tabletop Press" series of standards. This series of standards includes the following three parts: JB/T 5247.1-1998 Technical conditions for tabletop presses JB/T 5247.2-1998 Types and basic parameters of tabletop presses JB/T 5247.3-1999 Tabletop press accuracy This standard specifies the tabletop pressure Basic requirements for machine accuracy inspection, geometric accuracy and inspection methods. This standard applies to motorized bench presses. This standard was first published in March 1989. JB/T 5247.3-1999 Tabletop press accuracy JB/T5247.3-1999 standard download and decompression password: www.bzxz.net

ICS25.120.10
J62
JB
Machinery Industry Standard of the People's Republic of China
JB/T5247.3-1999
Bench Press
1999-05-14 Issued
Precision
2000-01-01 Implementation
State Machinery Industry Bureau
Issued
JB/T5247.3-1999
Foreword
This standard is a revision of ZBJ62019-89 "Bench Press Precision". The technical content of this standard is basically consistent with that of ZBJ62019--89, and it has only been re-edited according to relevant regulations. This standard shall be implemented from January 1, 2000. This standard replaces ZBJ62019-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Forging Machinery. The responsible drafting units of this standard are: Zhejiang Xiaoshan Precision Press Factory and Xiamen Forging Machine Tool Factory. The main drafter of this standard is Chen Yitong.
This standard was first issued in March 1989.
Scope
Mechanical Industry Standards of the People's Republic of China
Bench Press
Precision
This standard specifies the basic requirements, geometric accuracy and inspection methods for the precision inspection of bench presses. This standard applies to motorized bench presses (hereinafter referred to as presses). 2 Referenced Standards
JB/T5247.31999
Replaces ZB J62019--89
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T8170—1987
Rules for numerical rounding
GB/T10923—1989General Rules for Precision Inspection of Forging Machinery 3 Basic Requirements
3.1 The work surface is the inspection reference surface for the accuracy of the press. If the press is equipped with a work surface, the plane on the work surface shall be used as the accuracy inspection reference.
3.2 Before the accuracy inspection, the press shall be in a horizontal position, and the longitudinal and transverse level readings of its inspection reference surface shall not be greater than 0.10/1000. 3.3 The edge size of the plane to be inspected without precision is calculated according to the following formula: 10.05L
Where: 1 The edge size of the plane to be inspected without precision around the plane to be inspected, mm; L—the larger of the left and right or front and back dimensions of the plane to be inspected, mm. For the edge size of the middle hole of the inspected plane without considering the precision, take 0.51. 3.4 The precision tolerance value of each inspection item shall be calculated according to the actual inspection length, and the calculation result shall be rounded off to retain micrometer digits in accordance with the provisions of GB/T8170.
Approved by the State Machinery Industry Bureau on May 14, 1999, and implemented on January 1, 2000
JB/T5247.3-1999
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