火工品电容储能多脉冲点焊电源的设计.doc

火工品电容储能多脉冲点焊电源的设计

摘    要

 本文分析了小型及微型零件特别是某航天火工品电阻点焊的工艺特点及其对焊接设备的要求，讨论了某航天火工品的焊接现状，提出了当前某航天火工品电阻点焊的主要问题是焊接飞溅和焊点强度之间的矛盾。针对导柱和桥带材料的熔点、导热系数、电阻率等物理性能相差较大的焊件，设计一种专用电容储能多脉冲逆变式点焊电源，提供高频率多脉冲焊接电流用于航天火工品的焊接，以减弱或根本解决焊点强度和焊接飞溅这对矛盾。为解决某航天火工品点焊飞溅大这一问题提供了一个新思路，具有一定的理论价值和实用意义。
本文提出了将储能点焊和逆变技术相结合的设计思想，设计出了“电容储能多脉冲点焊电源”给出了主要的结构原理和主要的电路设计计算，为确保焊接质量和整机运行可靠性，本毕业设计拟采用稳压电源为储能电容充电，确保每一焊点获得相同的储能电容，逆变主回路拟采用双单端正激结构，以适应桥带点焊工作时间短的特点，防止逆变主回路颠覆，保证其工作可靠性，而且为了防止焊接过程中储能电容充电的过载，将设计逆变主回路和充电回路的协调控电路，并完成设计计算，达到毕业设计的要求。
 

关键词：，电阻点焊，逆变技术，电容储能，PWM控制，参数设计

ABSTRACT

This paper analyses the small and minitype components of a particular space for the fire resistance spot welding process characteristics and the requirements of welding equipment, discussed the space of a fire-product of welding the status quo, to a certain space of the current fire resistance spot welding of the goods The main problem is welding spatter and the conflict between the solder joint strength. column for the bridge with materials and the melting point, thermal conductivity and resistivity, and other physical properties of the large difference welding pieces, the design of a dedicated multi-capacitor discharge pulse power inverter spot welding, high frequency welding current for Multi-Pulse Space fire workers for the welding, to weaken or simply solder joint strength and resolve this contradiction welding spatter. To address the fire of a space for spot welding spatter big this issue provide a new idea, has a theoretical value and practical significance.
    In this paper, energy storage will be spot-welding technology and inverter combination of design ideas, to design a "multi-pulse energy storage capacitors spot welding power" is the main principle and structure of the main circuit design, to ensure the quality of welding and operation reliability, graduated from the power supply design to be adopted for energy storage capacitors charge to ensure that each spot given the same energy storage capacitors, inverter main circuit to be a dual single-ended forward structure to adapt to the bridge with spot welding The characteristics of short working hours to prevent the inverter main circuit subversion, and ensure the reliability of its work, and in order to prevent the welding process in the energy storage capacitors charge of the overload, will design the main circuit inverter circuits charge of the coordination and control circuits, and complete the design and calculation , to design the graduation requirements.

Key words：cap energy storage ,resistance spot welding, inversion technology ，PWM control, parameter design

目   录

摘    要 I
ABSTRACT II
1 绪论 1
1.1前言 1
1.2电阻点焊电源的特点及发展概况 1
1.3本文研究的内容和意义 3
2. 多脉冲电容储能逆变式电阻点焊电源结构原理 5
3主要模块功能分析 8
3.1逆变主回路 8
3.2储能电容稳压及其充电主回路 10
3.3时序控制电路 12
3.4逆变控制电路 16
4 设计计算 20
4.1储能电容充电回路 20
4.1.1储能充电电容计算 20
4.1.2限流电阻计算 21
4.1.3 整流桥计算选择 22
4.2时序控制电路的计算 22
4.2.1各定时器的计算 22
4.3逆变控制电路的计算 22
5结论 24
致谢 25
参考文献 26
附录A：多脉冲逆变式电容储能点焊电源A3图 27