(2) Starting from low-level applications, gradually accumulate experience and financial resources, and develop to high-level applications.
Open up the market and apply it to low-level applications that require less positioning accuracy and speed (such as burring with grinding wheels or milling cutters, chamfering, oil hole drilling, low-precision welding, press fitting and assembly of automatic assembly) The object is wood, plastic, aluminum and other free cutting materials. Due to its low cost, it is more than enough for these low-level applications. It has quickly received orders from the automotive and aircraft industries. Its products have already entered famous automobile factories such as Vlovo, SAAB, Volkswagen, Renault, GM and Boeing. Wait for the famous aircraft factory to undertake the above-mentioned "coarse" activities. From these applications, the company has gained a wealth of experience and considerable economic benefits, supporting the company to further develop to high-level applications.
This time the company exhibited the Tricept845 machining center. Its volumetric positioning accuracy is ±50μm, and the repeat positioning accuracy is ±10μm. Although these two indicators have a large gap from the traditional machine tools, they have practical value for parallel machine tools. Moreover, its feed rate has reached 90m/min and the acceleration has reached 2g. This is better than traditional machine tools that do not use linear motors. The spindle power is 30~40kW, the maximum speed is 24000～30000r/min, and the measuring system of Swiss IBAG electric spindle, Simens840D numerical control system and Heidenhain is adopted. The machining center has a modular structure. The three-bar structural components are available in 0°, 45°, and 90° configurations (ie, horizontal, inclined 45°, vertical machining centers). The workpiece mounting part is also an optional module. Moreover, within three years, if the user wants to change the layout of the three-bar structural components due to changes in the processing object, Neos can go to the site for reconstruction. The machine tool bracket is made of artificial granite (mixed with epoxy resin and granite gravel, poured and solidified). The structural success of Neos, in addition to simplifying the structure due to the reduced number of poles, has largely benefited from the three-pole central tube. The large diameter central tube not only greatly increases the rigidity of the structure, but also has a built-in measuring system. By adjusting the length of the measuring sleeve and the attitude of the central tube, the actual position of the tool in space can be directly measured, and then the indirect length of the three rods can be compared. Measurements (as compensation for deformation, temperature, etc.) attempt to solve the problem of position measurement of parallel machine tools. Interestingly, Neos started with only 3 people, and only 30 people so far. In just 5-6 years, it has developed into a star in the parallel machine tool industry.
The "Inverted Vehicle" of the V100 three-bar parallel mechanism exhibited by the US branch of Index Germany (that is, the spindle and the workpiece move on the X and Z axes, and the tool does not move, and the tool can be converted back, but no linear motion is performed. The vertical lathe, which is known as the "inverted car" in China, uses a parallel machine tool for the lathe, which is very clever. This is because:
One of the biggest weaknesses of a parallel mechanism is the low effective utilization of space. Therefore, the range of the spindle platform should be small, and the lathe is not like the machining center. The moving range of the workpiece relative to the tool is small, so the V100 is compact.
2 lathes generally require only two degrees of freedom (X and Y axes). The three-bar mechanism can now obtain three degrees of freedom of X, Y and Z, and also has one degree of freedom, which can be used for automatic loading and unloading.
In order to increase the rigidity, the index adopts a double-rod structure with two rods acting as a rod, which can also be called a three-double rod structure, which is similar to the structure of the Tianjin No. 1 Machine Tool Plant.
The V100 is fitted with a 5-inch chuck. The electric spindle has a speed of 8000r/min and a power of 26.48kW. The X, Y, and Z strokes are 450mm, 150mm, and 175mm, respectively, and can be automatically loaded and unloaded at a price of $175,000. It is said to have sold 5 units in Europe. The V100 may be the world's first parallel mechanism lathe.
Hexel Corporation of the United States has used a six-bar parallel structure as a separate component for turret milling machines. This upgrades low-cost conventional milling machines to 5-axis simultaneous milling machines. The table has a diameter of 710 mm. The X and Y stroke range is 305mm in diameter, Z-axis is 178mm, A-axis is ±25μm, maximum feed rate is 5.1m/min, weight is 91kg, and the price is $7,900 (including control software). It is said that 200 units will be produced in 2001.
In addition, the aforementioned Z3 composite spindle head may be the first example of a parallel mechanism for small parts of machine tools.
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