GB/T 29548-2024 High speed precision straight side press – Testing of the accuracy
1 Scope
This document specifies the accuracy class and inspection requirements of high speed precision straight side presses, and describes the accuracy inspection methods.
This document is applicable to high speed precision straight side presses.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10923 Test code of accuracy for metal forming machine
GB/T 35091 Straight-sided high-speed mechanical power presses - Types and basic parameters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 35091 and the following apply.
3.1
accuracy and repeatability at bottom dead center
tolerance of the change of the bottom dead center position of the slider during the operation of the high speed precision straight side press
3.2
temperature increase and speed increase
process in which the high speed precision straight side press runs in an accelerated mode from the initial state and accelerates to the maximum rated speed of the press within a certain period of time
3.3
temperature increase and speed unchange
process of adjusting the speed of a high speed precision straight side press from the end of the temperature increase and speed increase test to 80% of the rated maximum speed, and running at a constant speed at that speed
3.4
temperature unchange and speed unchange
process of a high speed precision straight side press reaching thermal equilibrium through constant speed operation and running at 80% of the rated maximum speed at a constant speed
3.5
initial state
state where the shutdown time of the high speed precision straight side press exceeds 10 hours
4 Accuracy class
4.1 The accuracy of high speed precision straight side presses (hereinafter referred to as presses) is divided into two classes: precise and ultra-precise. Examples of the uses of each accuracy class are shown in Table 1.
Table 1
Class Examples of uses
Precise Used for high-speed stamping of precision parts such as motor cores, E/1 iron cores and lead frames with general accuracy requirements
Ultra-precise Used for high-precision blanking of ultra-thin materials, high-speed stamping of ultra-precision parts such as high-efficiency micro-motor core and precision lead frame
4.2 If the class is not indicated, the inspection shall be carried out according to the requirements of precision class.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Accuracy class
5 Inspection requirements
6 Accuracy inspection
Annex A (Normative) Inspection method of the accuracy and repeatability at bottom dead center
闭式高速精密压力机 精度
1 范围
本文件规定了闭式高速精密压力机的精度等级、检验要求,描述了精度检验方法。
本文件适用于闭式高速精密压力机。
2 规范性引用文件
下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件；不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T 8170 数值修约规则与极限数值的表示和判定
GB/T 10923 锻压机械精度检验通则
GB/T 35091 闭式高速压力机型式与基本参数
3术语和定义
GB/T 35091界定的以及下列术语和定义适用于本文件。
3.1
下死点重复精度
accuracy and repeatability at bottom dead center
闭式高速精密压力机运行过程中,滑块下死点位置变化的允差。
3.2
加温加速
temerature increase and speed increase
闭式高速精密压力机从初始状态开始以加速方式运行,在一定时间内加速至压力机额定最高速度的过程。
3.3
加温恒速
temperature increase and speed unchange
闭式高速精密压力机从加温加速试验结束，调整速度至额定最高速度的80%，以该速度恒定运行的过程。
3.4
恒温恒速
temperature unchange and speed unchange
闭式高速精密压力机通过恒速运行达到热平衡状态后,以额定最高速度的80%恒速运行的过程。
3.5
初始状态
initial state
闭式高速精密压力机停机时间超过10h的状态。
4精度等级
4.1 闭式高速精密压力机(以下简称压力机)的精度分精密级和超精密级2个级别,各精度等级的用途举例见表1。
表1
等级 用途举例
精密 用于电机铁芯、E/1铁芯及一般精度要求引线框架等精密零件的高速冲压
超精密 用于超薄材料高精度冲裁、高效微电机铁芯及精密引线框架等超精密零件的高速冲压
4.2 未注明等级时,按精密等级的要求进行检验。
5 检验要求
6 精度检验
附录A（规范性） 下死点重复精度检验方法
