High-precision, fully automatic tool presetter (hereinafter referred to as knife adjuster) is a high-tech product integrating light, machine and electricity; it is a key functional component of high-end CNC machine tools and machining centers, and is a high-end CNC machine tool and basic manufacturing. Equipped with one of the important major projects of science and technology. One of the key tasks of the project is to complete the design of high-precision, fully automatic universal shafting. The comprehensive precision index of the shafting system is: radial runout 3μm/600mm; function requirements: suitable for all common HSK and ISO tool holder tool measurement ; can complete the measurement process of the tool parameters automatically or manually. This article will detail the structural design and functional design of the shafting.
1. Shaft structure design
The original shafting system of the Harnessing Tool is mostly made of a dense bead structure, and the accuracy is completely dependent on the machining of the machine tool . It is difficult to improve the precision. One of the key points to be solved in this project is to improve the overall accuracy of the shafting. To this end, the advanced technology of German KELCH company was introduced to absorb and absorb their advanced design concepts. On the basis of this, for the first time, a precision bearing structure was adopted in the design of the tool shaft system. High-precision angular contact ball bearings are used, and their rated basic load can fully carry large-sized tools . In the design, we consider increasing the length of the shafting to improve the rotation accuracy of the shafting; and splitting the shaft body and the transmission control part into a two-body design (see Figure 1) to facilitate assembly and improve labor efficiency. In the production process, we repeatedly researched and tested the machining process and assembly process, and finally mastered the key technology and tooling process of this structure to improve the precision. After the assembly of the key components, the grinding process and the fine adjustment of the key components finally reached the spindle radial runout. 3μm/600mm technical indicators.
figure 1
Inspired by the modular design concept, we changed the traditional design idea in the universal design of the shafting system, that is, the design of the main shaft is divided into the design of the insert sleeve and the sleeve. The traditional structure of the Harness Tool is that the main shaft is integrally connected to the shaft seat and does not have versatility. To measure tools with different taper shanks, add a reducer sleeve to the original structure, which increases the cumulative error of the instrument. In this design, the sleeve is connected to the shaft seat, and the sleeve is a connecting part of the main body of the main shaft and the inner sleeve. The measurement function is versatile by replacing the interposer module. Various interposing sleeves such as SK30, SK40, SK50, and HSK63 (see Figure 2) can be used to measure the tools of different taper shanks. The mounting of the insert sleeve is located through the end face, and the taper hole of the inner cone α° is designed on the sleeve; the taper shank is designed with the outer cone as α°; the distance from the positioning surface is the size β. Given the dimensional tolerances, it is close to zero fit to ensure the positioning accuracy of the end face and the tapered face during clamping. In order to ensure the overall measurement accuracy of the shafting system, the connection dimensions of the inner sleeve and the sleeve of each model must be fully interchangeable. In the process we have designed a complete set of inspection tools to ensure the consistency of the key dimensions of the insert sleeve and bushing parts.
figure 2
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