冲头

This machine design have inch move and pro and con turn or hand operated style revolve press action,and have detect measure orientation function,Chong head must at orientation talent make press action,reach to stability and safety.

设计有寸动及正反转动或手摇方式旋转压着动作，并有侦测定位功能，冲头须在定位才能做压着动作，达到稳定又安全。

Reviewing the history and looking into the future, after joining WTO, China is surely full of commercial opportunities, in our progressional journey, JingSheng people invite you to create brilliant tomorrow

成型冲头、塑料模用PIN针；回顾过去，展望未来，入世的中国必将商机无限，在前进的步伐中，精成公司全体同仁诚邀您携手共进，共同创造灿烂辉煌的明天！

But there is a puzzle during forming process, which is that the punch fractures after producing a quantity of the automotive tyre nuts. After choosing other materials for the punch, fretter still happened in the same position of the punch.

但是在成形过程中往往出现一个现象，生产一定数量的工件后，冲头发生断裂，选用不同的材料后，断裂部位仍发生在同一位置。

Using the Updated Lagrange finite element method and the elastic-plastic large deformation finite element formula based on virtual work-rate principle of finite deformation, the author studies in detail the plastic flow rule of MPF, including the influence of the work hardening index, friction, thickness of sheet, material, number and position of the punch.

作者采用逐级更新Lagrange法以及有限变形虚功率增率原理的弹塑性大变形有限元法，详细研究了金属板材多点成形的塑性流动规律，包括加工硬化指数、摩擦系数、板料厚度、材料、冲头个数及位置等对成形的影响，同时探讨了分段成形时的金属流动规律。

By combination of the finite differential technique with the upper bound elemental technique, simulation for the technology of extrusion directly following liquid infiltration which involves infiltration, solidification, and large plastic deformation in one process has been realized and the essences of various technical processes have been revealed by their corresponding simulation results showing the variation of the infiltrated depth and the temperature field with time during infiltration, the punch position, the solidification development of the matrix alloy, the state of the composite within the deforming zone, and the forming load required at different times during extrusion.

采用有限差分法和上限元法相结合，对融浸渗、凝固和大塑性变形为一体的液态浸渗后直接挤压工艺过程进行了数值模拟，从浸渗时浸渗深度与坯料温度场随时间的变化以及挤压过程不同时刻的冲头压下位置、坯料凝固情况、变形区坯料状态、成形载荷大小等方面揭示了不同工艺条件下的各种挤压过程的实质。

Our factory is a professional production of a variety of manufacturers punch.

我厂是一家专业生产各种冲头的厂家。

Ball lock punches are required with shedder pins and are to be.002 under maximum on standard tolerance unless otherwise specified by the company.

除非公司其它指定，要求使用带球锁的固定冲头，间隙为最大的标准公差。002

Simulation results of initial hole included the relationship of punch load and punch stroke, the hole profile, the distribution of stress and strain, the forming limit diagram, and the variation of the workpiece thickness. The simulation results showed good agreement with the experiments in the bore-expanding process.

由初始孔径4mm之料片於扩孔成形之数值模拟与实验结果比较得知，冲头负荷与冲程关系、内孔轮廓大小、应力与应变分布、成形极限图与工件厚度分布等，皆显示实验与数值模拟间的一致性。

The theoretical analysis methods on the first—order and second—order mechanical autofrettage technique of thick—walled cylinders, with reflecting the material characteristics, are studied systematically in this thesis.

本文首次提出和研究的厚壁圆筒二次机械自紧技术，可扩大机械自紧技术在不同口径身管上的应用，降低冲头的推力，充分挖掘现有设备的潜力。

It will expand the use of mechanical autofrettage technique on different—bore tubes, cut down the push force and further tap the potentialities of current equipments.

本文首次提出和研究的厚壁圆筒二次机械自紧技术，可扩大机械自紧技术在不同口径身管上的应用，降低冲头的推力，充分挖掘现有设备的潜力。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。