History of 3D measurement of Doosan Machine Tool, "Gong Panju Technical Director"
Column：Latest information of machine tool
Time：2021-06-24
Confirm the processing quality and whether it meets the design standard through high-precision measurement, and devote to improving the production capacity and shortening the assembly time with high-quality parts
The condition of shape error, surface roughness and dimension precision of parts is the decisive factor to determine the processing quality. Gong Panju, the technical director of the production department of Doosan Machine Tool who is responsible for the production of a group of FMS posts, has been an expert in the field of precision measurement of "three-dimensional detection" for 33 years, except for 4 years in the quality management department since he joined the company in 1984. In this issue, we will introduce Director Gong Panju of Doosan Machine Tool. He said that "measurement is not to determine whether the processed products are qualified or not, but to understand the causes of defects and eliminate them, so as to help high-quality processed parts enter the next process".
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Only the parts that meet the quality requirements can be put into the assembly line!
"FMS position, this department uses high-precision three-dimensional measuring equipment to confirm whether the processing quality of parts meets the design standard", Minister Gong Panju introduced his department in this way, and explained that "full inspection and sampling inspection are adopted to inspect all processing parts produced in the company, and only the parts that meet the quality level are put into the assembly line", "the measurement process must be completed before assembly". Minister Gong Panju introduced that "the parts that cannot meet the quality level are the cause of the defect of the whole machine. After the defect occurs, the subsequent modification and improvement of the process will lead to the result of" low productivity and delayed assembly time ". Therefore, the precision inspection of parts is a very important process".
The unit of measurement for the surface, profile and shape of components of Doosan Machine Tool can reach 0.001 mm (100 equal parts of hair), including machined parts with complex shapes such as gears. "In order to reduce measurement errors, it is necessary to thoroughly understand the quality required by the design of distance tolerance, shape tolerance, etc. on the design drawings of parts and components", and emphasize that "especially for precision measurement, the ability of measuring personnel, the precision of measuring equipment, and the measurement environment of constant temperature and humidity are essential conditions".
Large three-dimensional measuring instrument for precision measurement of large workpieces
"When I first entered the company, I could produce more than 600 sets of equipment in a year, but now I can produce more than 1000 sets of equipment in a month", Minister Gong Panju said, "There are also many lines up of equipment. Recently, the demand for large-scale equipment has also driven the demand for large-scale processing parts with high precision requirements, and the demand for measuring equipment that can accurately measure large parts has also increased.". In order to conform to this trend and improve the measurement precision, Doosan Machine Tool recently introduced a large high-precision three-dimensional measurement equipment.
Measurement errors sometimes cause conflicts among production, measurement and assembly personnel. "The concentricity measurement error of one product in the machined parts processed by the company should be within 0.005 ㎜, and it was 0.006 ㎜ when I measured it," recalled the minister of Gong Panju. Other departments "measured within 0.005 ㎜ in many places outside, and concluded that my measurement was wrong.".
However, Minister Gong Panju, who was very confident in his measurements, introduced the 180 ˚ On the other hand, the measured value should be the opposite sign, which was re verified with this theory. Minister Gong, through this reverse thinking, convinced everyone that the measured value was correct, and found a method to obtain more accurate measured value. Minister Gong Panju has accumulated a wealth of knowledge how through more than 30 years of expertise and attempts at new measurement methods, developed "operation standard book" that can improve the accuracy of processing equipment, and applied it to the measurement work.
What is the future development direction of 3D measurement technology?
Gong Panju, the director of FMS in the production team 1 of Doosan Machine Tool Production Department, said, "Up to now, the measurement method is mostly the contact method, and in the future, the non-contact (laser) measurement method may be preferred." At the same time, he emphasized that "the measurement of machined parts is not to 'judge whether it is qualified', but to work from the level of preventing defective products in advance, and develop measurement methods and measurement technologies on this basis".
Over the past 37 years, Minister Gong Panju, who has been working hard at Doosan Machine Tool, recalled that "for the professionalism of measurement technology, we can constantly challenge, which is a very lucky thing for me", The rest of the time "want to pass on their knowledge how to the company's descendants".
\
Only the parts that meet the quality requirements can be put into the assembly line!
"FMS position, this department uses high-precision three-dimensional measuring equipment to confirm whether the processing quality of parts meets the design standard", Minister Gong Panju introduced his department in this way, and explained that "full inspection and sampling inspection are adopted to inspect all processing parts produced in the company, and only the parts that meet the quality level are put into the assembly line", "the measurement process must be completed before assembly". Minister Gong Panju introduced that "the parts that cannot meet the quality level are the cause of the defect of the whole machine. After the defect occurs, the subsequent modification and improvement of the process will lead to the result of" low productivity and delayed assembly time ". Therefore, the precision inspection of parts is a very important process".
The unit of measurement for the surface, profile and shape of components of Doosan Machine Tool can reach 0.001 mm (100 equal parts of hair), including machined parts with complex shapes such as gears. "In order to reduce measurement errors, it is necessary to thoroughly understand the quality required by the design of distance tolerance, shape tolerance, etc. on the design drawings of parts and components", and emphasize that "especially for precision measurement, the ability of measuring personnel, the precision of measuring equipment, and the measurement environment of constant temperature and humidity are essential conditions".
Large three-dimensional measuring instrument for precision measurement of large workpieces
"When I first entered the company, I could produce more than 600 sets of equipment in a year, but now I can produce more than 1000 sets of equipment in a month", Minister Gong Panju said, "There are also many lines up of equipment. Recently, the demand for large-scale equipment has also driven the demand for large-scale processing parts with high precision requirements, and the demand for measuring equipment that can accurately measure large parts has also increased.". In order to conform to this trend and improve the measurement precision, Doosan Machine Tool recently introduced a large high-precision three-dimensional measurement equipment.
Measurement errors sometimes cause conflicts among production, measurement and assembly personnel. "The concentricity measurement error of one product in the machined parts processed by the company should be within 0.005 ㎜, and it was 0.006 ㎜ when I measured it," recalled the minister of Gong Panju. Other departments "measured within 0.005 ㎜ in many places outside, and concluded that my measurement was wrong.".
However, Minister Gong Panju, who was very confident in his measurements, introduced the 180 ˚ On the other hand, the measured value should be the opposite sign, which was re verified with this theory. Minister Gong, through this reverse thinking, convinced everyone that the measured value was correct, and found a method to obtain more accurate measured value. Minister Gong Panju has accumulated a wealth of knowledge how through more than 30 years of expertise and attempts at new measurement methods, developed "operation standard book" that can improve the accuracy of processing equipment, and applied it to the measurement work.
What is the future development direction of 3D measurement technology?
Gong Panju, the director of FMS in the production team 1 of Doosan Machine Tool Production Department, said, "Up to now, the measurement method is mostly the contact method, and in the future, the non-contact (laser) measurement method may be preferred." At the same time, he emphasized that "the measurement of machined parts is not to 'judge whether it is qualified', but to work from the level of preventing defective products in advance, and develop measurement methods and measurement technologies on this basis".
Over the past 37 years, Minister Gong Panju, who has been working hard at Doosan Machine Tool, recalled that "for the professionalism of measurement technology, we can constantly challenge, which is a very lucky thing for me", The rest of the time "want to pass on their knowledge how to the company's descendants".