移圈针扩圈片安装过程的应力场模拟

Stress Field Simulation on the Spring Installation Process of Transfer-Needle

为了解决移圈针上扩圈片安装过程中出现的冲头崩裂和安装不牢固问题,采用有限元软件ABAQUS对不同倒角半径的冲头在扩圈片安装过程中的应力应变场,及扩圈片和其安装槽之间接触力的影响规律进行模拟和分析.结果表明,随着倒角半径的增大,冲头上所受的应力呈现整体下降的趋势,扩圈片与其安装槽的接触应力也在减小.经比较分析得知,最佳的倒角半径为0.11mm,此时,既能保证冲头拥有较长的使用寿命,又能保证扩圈片的安装牢固度.将模拟结果应用于移圈针的实际生产,单枚冲头的使用寿命与之前相比提高了5倍,且扩圈片的安装牢固率达到了100%.

To solve the cracking of the punch and the shedding of the spring in the process of spring installation, influence law of the punch＇s chamfering radius on the stress value and contact force between spring and groove was simulated and analyzed with the finite analysis software of ABAQUS. The results showed that with the increase of the chamfering radius, the stress values in punch followed a whole descending trend and the contact force gradually decreased. The longest service life for punch and the optimum installing effect for spring were obtained in the punch with a chamfering radius of 0.11 mm. The results were applied and examined in the actual production of transfer-needle,a punch＇s service life increased 5 times longer than before, and the spring＇s installation rate reached 100%.