Jia Shun Shi

A Micro Milling Model Considering Metal Phases and Minimum Chip Thickness

In this paper, a micro milling model is brought forward. The influences of different metal phases and the minimum chip thickness are considered in the model. The cutting forces and the surface generation in the micro milling process are predicted. Through the experiment validation, the results correlate to the model very well.

Research on Error Compensation by Semi-Closed Loop Control for a 3-UPS Parallel Machine Tool

This paper took a 3-UPS Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equations on driving chain and constraint chain was established on the basis of kinematics analysis. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of installing respectively the encoders on the each joint of parallelogram mechanism, namely the compensation way of “parallel driving and series feedback” was adopted. Finally this paper has also deduced the theoretical model of error compensation. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT

The Analysis on the Singularity of a 3-TPT Parallel Robot

This paper took a 3-TPT Parallel Robot as the object to study its singularity within the workspace. Firstly the kinematics equation of Parallel Robot was established according to the kinematics analysis and the Jacobian matrix of parallel mechanism could be obtained at the same time. Then the workspace of Parallel Robot was carried on the solution and the analysis. Finally the degree of operability was taken as the measure index to analyze the singularity of Parallel Robot within the workspace, and the results showed that this Parallel Robot does not have singular position. The analysis results of this paper have laid the theoretical foundation for the position control and processing track planning of this Parallel Robot.

Dynamic Characteristics Analysis of Two-Phase Flow Diaphragm Pump Based on MATLAB and ADAMS

Two-phase flow diaphragm pump (hereafter referred to as the diaphragm pump) is a new generation pump of the reciprocating pump, which used to transport high fretting corrosion medium. At present, the diaphragm pump is widely used in many fields such as Non-ferrous metals, Chemical, Coal, Electric power and so on. The diaphragm pump is of the heart of the equipment; therefore it must have the very high reliability. As the important part of diaphragm pump, the dynamic characteristics of the power end will directly affect the behaviors and life of the solid machine. This paper introduces the work principle of the diaphragm pump, carries a simulation to the virtual prototype of the diaphragm pump based on the numerical value analyze software MATLAB and the dynamics of mechanical system simulation software ADAMS and get the relationships between the design parameters and the dynamic characteristics of the power end of diaphragm pump, which provide a theoretical basis for optimizing the diaphragm pump in the future.

The Error Modeling on a Kind of Parallel Machine Tool in Considering the Joint Gap

This paper takes a kind of 3-UPS Parallel Machine Tool (PMT) as the objective of research. First, the kinematic analysis is carried out to the machine and the kinematics equation is obtained. Then, the mathematical model on tool posture error of this machine is established in considering the joint gap based on the kinematics equation. According to the mathematical model expression, the posture error of tool tip point can be calculated when the specific values to the length error of the driving rod and the position error of the joint point are known. The establishment of error model has important theoretical significance to the design as well as the error analysis and compensation of this Parallel Machine Tool.

Development of Machining Method for Micromold

Micromold manufacturing technology is very important for the mass production of micro parts. In this paper, modeling of micromold is established in 3D software firstly. The 3D modeling is input into machining simulation software Master CAM to simulate machining process. The machining parameters and cutting tool path are optimized in machining simulation. Machining G code of micromold obtained from post-process program of Master CAM is input into HMI system of Micro Machine Tool (MMT), and hence the micromold will be machined precisely in MMT.

Simulation of Dynamic Performance for Hydro-Hybrid Spindle-Bearing System of Superhigh Speed Grinder

Spindle-bearing system plays a crucial role in superhigh speed grinding, which directly affects machining precision, but it is complex and difficult to get the dynamic performance in experiment. This leads to study how to accurately simulate dynamic performance of spindle-bearing system. So a method which springs and damping units imitate bearing support is proposed in this paper. The proposed method can predict the regular pattern which bearing stiffness and damping ratio affect natural frequency and harmonic response. The research demonstrates that the method predicts well the dynamic performance of the spindle-bearing system and it is close to actual condition, therefore, it can be a reference for dynamic optimization design of spindle-bearing system in superhigh speed grinding.

Development of an On-Line Bowl-Shaped Diamond Grinding Wheel Dresser

In this paper, a new on-line diamond grinding wheel dresser, which is comprised of high-speed rotatory dressing wheel, micro-feed mechanism and control system, is presented. The principle of micro-feed machine working at requiring dressing depth, the control method of the dressing wheel speed adjusting and dressing depth, and structure of the control system are also introduced. The experiments we have done show that the dresser reach the goal of diamond grinding wheel on-line dressing.