Zi Qiang Zhang

Influence of Dresser Setting and Assembling Errors on Shape Precision of Form Wheel

Influence of dresser setting highness error and assembling error on size precision and shape precision of dressed wheel section is studied and error emulational analyzing is carried out in NC dressing form wheel. Analyzing results indicate: influence of dresser setting highness error is quite small and can be ignored, influence of dresser radial or axial assembling error on shape precision of dressed wheel section is biggish and influence of axial assembling error is bigger among them, the latter can bring wheel section shape error of the same order as itself. Therefore, necessary measures must be taken to insure that assembling errors is smaller than 10 μm in dresser assembling, then requirement of form wheel dressing precision can be met.

Error Estimate of Approximate Double Circular Arc Interpolated Method for Curve Smoothing

Approximate Double Circular Arc Interpolated Method which was put forward by author, is different from other circular arc interpolated methods in demanding only the corner between normal directions of each circular arcs at intersection point are less than designated allowed value but not demanding contiguous circular arcs are tangent, and makes the calculating be predigested. In order to estimate error of the method, emulated calculating is carried out, namely the course of curve being obtained by reverse engineering is simulated in this paper. The results show: if space between measure points is about 0.1mm in curve being obtained by reverse engineering, then, the most departure of smoothing results from original curve is 0.552μm for the stated example. Influence of the error on NC machining is quite small, so it can meet the needs of NC machining.

Discussion on Electromagnetic Radiation Protection Standard of Light Industrial Equipments

The popular international and Chinese electromagnetic radiation protection standards are introduced, including the ICNIRP guidelines constituted by the International Commission on Non-Ionizing Radiation Protection, the EN62233 standards established by the European Committee for Electrotechnical Standardization and the GB 8702-88 regulations constituted by Ministry of Environmental Protection of the People’s Republic of China, etc. The situation of the light industrial equipments electromagnetic radiation has been tested and analyzed: the power of the induction heater is often up to thousands kilowatts, and there are many electrical control components and many dense circuitries in light industrial equipments. Their complicated electromagnetic fields release continuously electromagnetic waves and engender electromagnetic radiations to the surrounding environment. And, Chinese electromagnetic radiation protection standards lack limits for band less than 100 KHz (except 50Hz). It makes the electromagnetic radiation assessment of light industrial equipments lack sufficient basis. The electromagnetic radiation protection standard of light industrial equipments was discussed and the limits for electromagnetic radiation protection of light industrial equipments are suggested.

On Reconfigurable Machines and Reconfigurable Assembling Machine for DC Connector Plug

Reconfigurable machines are essential components to implement a reconfigurable manufacturing system. This paper focuses on one of reconfigurable machines: reconfigurable assembling machine. A reconfigurable automatic assembling machine for DC connector plug is designed. It can be divided into the basal module and the changeable module. The same basal module with different changeable module can be assembled into different special assembling machines for DC connector plug with different shape, size or number of electrodes.

On Three Axes Ganged NC Grinding Machine with Ganged Revolving Spindle

The different uses of NC grinding machine with ganged revolving spindle and the requirements to NC grinding machine for several special uses are discussed. A multifunctional three axes ganged NC grinding machine with patent right is introduced. Its ganged revolving spindle is changeable. Therefore it can meet the requirements of different uses. When the ganged revolving spindle works as headstock spindle, the NC grinding machine can be used for machining cylindrical cam, plate cam, noncircular shaft and so on. When the ganged revolving spindle works as a revolving spindle of dresser, the NC grinding machine can be used for dressing form wheels with multifarious curved generatrices accurately. With simple mechanism, wide flexibility and simple NC programming, it is especially fit for laboratory use. A new-style NC dresser with invention patent right is also introduced.

On Programming for NC Grinding of Grooved Cam with Discretional Plane Curve Profile

In grinding of grooved cam, the programming for NC machining can’t directly be accomplished according to track curve of roller center in working drawing because the diameter of wheel becomes smaller than diameter of cam’s follower roller after wheel dressing. Track curves of wheel center are equidistant curves of the track curve of roller center and they can be gained by equidistant offset. But track curves of wheel center can’t be gained by equidistant offset for grooved cam with discretional plane curve profile, due to the profile including aspheric curves whose equations are usually unknown. To solve above problem, circular arc approximation for the aspheric curve part was realized by using Approximate Double Circular Arc Interpolated Method (ADCAIM), then equidistant offset of circular arcs was carried out by “offset” way, and consequently track curves designed for wheel center of any diameter can expediently be gained on AutoCAD platform. Validation experiment of simulation grinding was fulfilled on a NC milling machine. The experiment results indicate: it is feasible to NC grind grooved cam with discretional plane curve profile using the method introduced in this paper for the example.

On Auto-Programming for NC Machining of Aspheric Curve

Approximate Double Circular Arc Interpolated Method (ADCAIM) has been proposed by the authors. It requires only the included angles in the normal directions of the adjacent arcs at intersection points to be less than specified value, but does not require the adjacent arcs to be tangent as in other circular arc interpolated methods. ADCAIM is an approximate method with better calculating speed because of its concise calculation, and its interpolated error can meet the requirement too. The problems in NC programming of aspheric curves have been solved by using ADCAIM. In this paper, to the plane profile including aspheric curves, using VB program language as the second development tool, auto-programming for NC machining of aspheric curve is also realized by using ADCAIM, as long as the curve’s profile graphics on the AutoCAD is known. The research result indicates: the method introduced in this paper can meet the needs of NC machining in both interpolated accuracy and calculating speed for the example.

On Adaptable Design for SCARA Manipulator with Quick-Replaceable Arms

By surveying SCARA manipulator in the market, the question that the overall length of arms is fixed, which leads its operating range to be relatively fixed, and the manipulator has badly adaptive can be found. Aiming at the problem, a SCARA manipulator whose arms can be replaced quickly had been designed according to the concept of adaptable design, and the principle of replacement arms had been put forward basing on the analysis to the minimum operating radius of manipulator in this paper. Moreover, an adaptable interface for replacing quickly different grippers during the process of production had been designed in the paper.

Adaptable Interface Design of Roller Module Rapid Replacement System

The research actuality and development of roller module replacement technology are talked over in this paper. Positioning scheme of one plane and two pins with the special rounded edge diamond pin that is suitable for the longer roller is discussed, which is meeting the parallelism tolerance requirement for the roller within the full length; thus reducing manufacturing tolerance requirement for the spacing between pin axes and reducing manufacturing difficulty. And on this basis, adaptable interface design of roller module rapid replacement system which is suitable for the longer roller has been completed. The invention patent on the roller module rapid replacement system has already been applied for, and the precise positioning of roller module can be realized.

Design and Optimization of Elevator Mechanism in Roller Module Rapid Replacement System

The elevator mechanism in roller module rapid replacement system had been designed and an optimal math model had been established aiming at the maximum thrust demanded for hydraulic cylinder of the elevator mechanism is too large in this paper. In the model, installation positional parameters of the hydraulic cylinder are used as design variables; the minimum installation distance of the hydraulic cylinder, triangle position relations formed by hydraulic cylinder and design variables, and so on are used as constraint conditions; the maximum thrust of hydraulic cylinder is used as objective functions. And the model had been solved by using the MATLAB software. The case optimization result shows: the maximum thrust of hydraulic cylinder is lessened. And design purpose has been realized.