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Technical Introduction of ZSW15 Intelligent Double-Flank Worm Wheel& Worm Roll Testers
I Instrument Description     
ZSW15 intelligent double-flank worm wheel and worm roll testers (hereinafter referred to as ‘instrument’) is developed by Harbin Zhida Measurement & Control Technology Co., Ltd. on the basis of previous products. It combines the design concepts of advanced international double-flank worm wheel and worm roll testers with actual needsof worm wheel manufacturers. It adopts the computerized numerical control (CNC) technology and is capable of automatic acquisitions and intelligent processing of measuring data. It automatically measures the total radial composite deviation Fi”, tooth-to-tooth radial composite deviation fi” and runout Fr” of a worm wheel. Meanwhile, given the theoretical center distance, it can easily measure the upper and lower deviations ofthe center distance variation(Eas, Eai) which affects the worm wheelbacklash, thereby intelligently evaluating the quality of the worm wheel.
1. Main Technical Parameters
1) Min.module of the measured worm wheel -------------------------------0.5 mm
2) Max.outer diameter of the measured worm wheel ----------------------150 mm
3) Distance between worm and worm wheel center----------------- 30 to 120 mm
4) Max. worm shaft length -------------------------------------------------140mm
5) Min. resolution of the indication system -------------------------0.0001 mm
6) Overall dimension of the instrument ---------------1290 * 650 * 1960 mm
7) Supply voltage / frequency --------------------------AC 210 to 230V/ 50Hz
2. MeasuringFunctions
   1)Total radial compositedeviation: (Fi”);
   2)Tooth-to-tooth radial compositedeviation: (fi”);
   3)Runout: (Fr”);
   4)Upper and lower deviations of center distance variation: (Eas, Eai);
3. Main Precision Indices: Seeattached Table 1
4. Instrument Structure
1) A quick plug and unplug structure facilitating the worm wheel installation is adopted. It is only necessary to replace the shaft sleeve formeasuring different worm wheels on the same measuring machine.
2) The rotation axis of the master worm adopts the mature precision ball bearing structure and is driven by a Japan PANASONIC digital AC servo unit. The measurement control is realized through the combination of a computer and a RaiserDMC3400 motion controller. The deviations are measured through a high precision digital optical encoder (Britain Renishaw RGH24). All measurements are fully automatic.
3) A double-encoder structure is adopted at the horizontal direction, enabling direct, fast and convenient measurements of center distances with no need of calibrations with standard workpieces.
4) Radial motions of theworm wheel and vertical motions of the worm are controlled by motors, offering high automation degree.
5. Software Introduction
1) A measuring software under Windows 7 is adopted. Basic parameters (tooth number, module, pressure angle and addendum modification factor) of the measured worm wheel and the master worm as well as the precision grade or free tolerance parameters can be input for error evaluation.
2) The measuring speed and meshing rotation direction can be adjusted in the software;
3) Measurement results can be output through a laser printer. Variouscommon international formats can be applied to the measurement reports.
4) The software can be used for grouping according to center distance deviations, which is visualized by indicator lights on the screen;
5) Measurement data are automatically saved.Quality indicators (Cp and Cpk values) can be automatically calculated with respect toproduct models and measuring dates.The saving format is compatible with Microsoft Office.
II Standard Configuration
The standard configuration includes the following contents:
1. Measuring machine ----------------------------- 1 Set
2.  Special workbench ------------------------------1 Piece
3.  Computer ------------------------------------1 Suite
4.  Operation manuals --------------------------1 Suite
5.  Worm tooling --------------------------------1 Suite
6.  Worm wheeltooling -------------------------1 Suite
7.  Packing list -----------------------------------1 Suite
 III Optional Accessories
1. Worm wheel tooling (shaft sleeve)
IV Requirements on the Instrument Installation Environment
1) The instrument installation foundation should be solid and flat;
2) Two-phase AC power supply 220V/50HZ (±5%) should be used for the instrument.The supply voltage should be stable;
3) The environment should be free from electromagnetic interference.
V. Installation, Acceptance and After-Sales Service
1. Instrument packing box can only be opened under the supervision and approval of the technical personnel of the manufacturer;
2. After the completion of the instrument installation and adjustment, both parties should be jointly responsible for the on-site acceptance according to the technical agreement. A Final Acceptance Report should be signed by both parties upon completion of the acceptance;
3. In order to ensure normal operations of the instrument, in case of problems in the use of the instrument, the manufacturer should propose solutions to the user within eight hours after receiving a notice hereof. If the problems are not eliminated, the manufacturer should send technicians to the site to solve the problems within three working days. 
VI Quality Assurance
1. The warranty period of the instrument is one year. If any quality problem is discovered in the instrument itself within the warranty period, the manufacturer should provide maintenance service for the instrument for free; If the quality problem is caused by the user’s improper use, costs of maintenance shall be charged from the user;
2. An after-sales service system including regular return visits and telephone consultations is adopted to timely discover and solve problems and difficulties in the use of the instrument;
3. Original software functions of the instrument can be upgraded for free over the lifetime of the instrument.
Attached Table1: Main Precision Indices


No. Item Verification Requirements Verification Tools
1 Perpendicularity between theworm wheel shaft sleeve axis andthe worm top-bottom center ligature 0.005mm/100mm a. Dial indicator
b. Magnetic stand
2 Circular runout of the motor-driven center of worm Runout: 0.003mm a. Dial indicator
b. Magnetic stand