The automatic positioning of the workpiece proposed by the author makes the workpiece coordinate system automatically adapt to the processing requirements of the machine tool. This method differs from the traditional method of correction in that instead of trying to “right†the workpiece, it measures the skew angle and offset of the workpiece placed on the workbench, and then based on this declination and offset, through the automatic Correct the part's machining program to ensure that qualified parts are machined. This method can reduce the auxiliary time occupied by workpiece positioning and clamping, and it can greatly exert the high efficiency of CNC machining.
Fig.1 Relationship between machine coordinate system and workpiece coordinate system
1 Automatic workpiece positioning principle Measurement of the workpiece position To illustrate the problem and consider the actual clamping situation, let the workpiece be skewed only in the XOY plane. When workpiece mounting is skewed, the position of the workpiece should be measured first to determine the relationship between the machine coordinate system and the workpiece coordinate system. Let Fig. 1 be the workpiece with skewed setup. The outer contour is O'ABC, X'O'Y' is the workpiece coordinate system, and XOY is the machine coordinate system. Using the measuring head to measure two points along the O'A edge, the center coordinate (x1, y1), (x2, y2) of the probe is displayed, and then the other two points (x3, y3) are measured along the O'C edge. ( X4, y4), from the above 4 points and considering the probe radius r, the coordinates of the O′ point and the inclination angle of the O′A side are a=tan-1[(y2-y1)/(x2-x1) ]x=(k1 x1-k2 x3-y1+y3)/(k1-k2)+rcos [(b+a)/2]/sin[(ba)/2] ∆y=[( k1 y3-k2 ) Y1)+k1 k2 (x1-x3)/(k1-k2)+r sin[(b+a)/2]/sin[(ba)/2]
Where: k1 = tana k2 = tanb = ( y3-y4) / (x3-x4)
Figure 2 block diagram
The coordinate transformation is set at a point coordinate value (x', y') in the workpiece coordinate system X'O'Y'. If the known workpiece coordinate system X'O'Y is translated with respect to the machine coordinate system XOY, ∆x, ∆y, And rotate an angle a, the coordinate value of this point in the XOY coordinate system, can be found as x=x'cosa-y'sina+∆xy=x'sina+y'cosa+∆y automatic positioning method And the block diagram finds a, ∆x, and ∆y from the measurement points. From the coordinate transformation formula, the coordinate values ​​in the original numerical control code can be corrected, new NC codes can be generated, and new numerical code processing can be used to obtain the original method. The same processing result. The actual operation of this method is very simple, that is, only the coordinates of the four points are measured and input into the computer. The work of calculating and correcting the original numerical control code can be automatically completed by a programmed program. Because only a simple calculation and correction of the coordinates in the original numerical control code is required, the program can be conveniently implemented in Borland C++. The block diagram of the program is shown in Figure 2. 2 Example The workpiece shown in Fig. 3 is used to process the inner cavity contour ABCD. The coordinate of each point is A(10,10), B(60,10), C(60,40), D(10,40). The tool path is indicated by the arrow. The original numerical control code is N10 G90 G54 G00 X40.0 Y30.0: N11=15.0, N12 G41 G01 X40.0 Y10.0 F100 D01: N13 X60.0 Y10.0: N14 X60.0 Y40.0: N15 X10.0 Y40.0: N16 X10.0 Y10.0: N17 X40.0 Y10.0: N18 G40 X40.0 Y30.0: ...
Figure 3 processing examples
After installation of the workpiece is skewed, the known probe radius r is 10mm, measured (10.92, -8.26), (60.84,-5.64), (-9.58, 40.62), (-8.01, 10.66), and substituted into the modified After the program, the new NC code can be output as N10 G90 G54 G00 X40.88 Y33.25: N11 Z15.0: N12 G41 G01 X41.92 Y13.28 F100 D01: N13 X61.89 Y14.33: N14 X60.32 Y44.29: N15 X10.39 Y41.67: N16 X11.96 Y11.71: N17 X41.92 Y13.28: N18 G40 X40.88 Y33.25:... Processing with the new numerical control code can be obtained with The same processing results of the original method, obviously the processing accuracy will not change. 3 Conclusion An automatic positioning principle based on the machined workpiece is proposed. This method can relax the requirements for the installation of the workpiece, and can obtain the same processing results as the original method, which has certain practical significance for shortening the installation and adjustment time of the workpiece and improving the production efficiency.
Company Profile
Xinxiang Lifeierte Filter Co., Ltd is specialized in manufacturing filter elements, filter housing, filter equipment, testing equipment and hydraulic parts.She is located in Xinxiang that is the center of filtration in China.Xinxiang Lifeierte Filter Co., Ltd integrates with oil filtration, water treatment and air purification to provide the society with more professional service and meet customers` demands. What`s more, Lifeierte has top-notch R&D team, professional technical team, effective production network and perfect after-sales service system. The corporate philosophy of Lifeierte is [to purify environment, to serve society, to manage faithfully,and to pursue excellence". The company also established the comprehensive cooperative relations with some famous design & research institutions and colleges. The quality of the product has reached the international advanced level and makes us achieve remarkable economic benefits.
Products
Mainly including:
National standard filters and filter elements, replacement of abroad filters and filter elements, the hydraulic equipment like oil filter machines and filter series, the filter detective equipment;
Compressed air filters and filter elements, air cleaning filter drums and filter-bag series, various kinds of air cleaning facilities in different patterns;
Kinds of water treating equipment like stainless steel water filters and filter elements, full automatic backwashing filters.
We carry out ISO, DIN, IDF and 3A industry standard strictly during the manufacturing process and all the products can conform to the standards of GMP.
The endeavor makes us more professional. The performance and the effect of our replace products are comparable with imports; in addition the performance and the quality of domestically-made filters or filter elements are also stable and reliable. All those have been selected and recognized by customers and research institutions.
testing standards are satisfied by the products
ISO2941- filter elements- the testing for the cracking resistance
ISO2942- filter elements-the identifying for the structural integrity
ISO2943- filter elements-the identifying for the compatibility between material and the liquid
ISO3723- filter elements-the testing method for the end load of filter elements
ISO3724- filter elements-the identifying for the fatigue properties of the filter elements
ISO3968- filter elements-the testing for determination of pressure differential/flow characteristics
ISO4572- filter elements-the testing for the multi-pass method for evaluating filtration performance.
Parker Filter
Parker Filter,Parker Filtration,Parker Hydraulic Filter,Parker Coalescing Filter
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