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
閉式高速精密壓力機 精度
1 范圍
本文件規定了閉式高速精密壓力機的精度等級、檢驗要求,描述了精度檢驗方法。
本文件適用于閉式高速精密壓力機。
2 規范性引用文件
下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件，僅該日期對應的版本適用于本文件；不注日期的引用文件,其最新版本(包括所有的修改單)適用于本文件。
GB/T 8170 數值修約規則與極限數值的表示和判定
GB/T 10923 鍛壓機械精度檢驗通則
GB/T 35091 閉式高速壓力機型式與基本參數
3術語和定義
GB/T 35091界定的以及下列術語和定義適用于本文件。
3.1
下死點重復精度
accuracy and repeatability at bottom dead center
閉式高速精密壓力機運行過程中,滑塊下死點位置變化的允差。
3.2
加溫加速
temerature increase and speed increase
閉式高速精密壓力機從初始狀態開始以加速方式運行,在一定時間內加速至壓力機額定最高速度的過程。
3.3
加溫恒速
temperature increase and speed unchange
閉式高速精密壓力機從加溫加速試驗結束，調整速度至額定最高速度的80%，以該速度恒定運行的過程。
3.4
恒溫恒速
temperature unchange and speed unchange
閉式高速精密壓力機通過恒速運行達到熱平衡狀態后,以額定最高速度的80%恒速運行的過程。
3.5
初始狀態
initial state
閉式高速精密壓力機停機時間超過10h的狀態。
4精度等級
4.1 閉式高速精密壓力機(以下簡稱壓力機)的精度分精密級和超精密級2個級別,各精度等級的用途舉例見表1。
表1
等級 用途舉例
精密 用于電機鐵芯、E/1鐵芯及一般精度要求引線框架等精密零件的高速沖壓
超精密 用于超薄材料高精度沖裁、高效微電機鐵芯及精密引線框架等超精密零件的高速沖壓
4.2 未注明等級時,按精密等級的要求進行檢驗。
5 檢驗要求
6 精度檢驗
附錄A（規范性） 下死點重復精度檢驗方法
