# A Study on Improving the Machining Performance of Scrolls
## 1 Introduction  
Scroll-type compressors, which were first patented by [PERSON] [1] and commercialized in the 1980s, are widely used in small- and medium-sized refrigeration and air conditioning systems. The key components of a scroll-type compressor are a pair of fixed and orbiting involute scrolls, where the fixed scroll meshes with the moving one in a revolving orbital motion. A method for describing the scroll geometry and a thermodynamic model of the scroll compressor have been proposed by [PERSON] et al. [2]. For the scroll-type compressor, [PERSON] et al. [3] developed a design optimization procedure and investigated the problem of reducing frictional losses in bearing components. Unlike conventional compressors, the scroll-type compressor is the only type of compressor that utilizes multiple symmetric compressing chambers during its operational periods, and it has few moving parts. This leads to advantages such as lower energy use, smooth operation, less vibration, and noise-producing benefits [4]. However, the manufacture of scroll-type compressors generally needs longer machining time and higher product precision. Considering the requirements for rapid material removal rates and high product precision in the manufacture of scroll components, conventional methods commonly use trial and error to approach the most appropriate machining parameters. However, these usually yield lower efficiency and have higher costs. To shorten the machining time and improve the product precision, various strategies, such as feed rate planning, chattersuppression measures, and optimization of milling parameters, have been proposed for consideration in the manufacturing of scrolls. Regarding feed rate planning, [PERSON] and [PERSON] [5] developed a feed rate optimization technique to minimize the cycle time for machining spline tool paths. [PERSON] et al. [6] examined the possibility of scheduling or varying the feed rate by considering the geometry of the contour. [PERSON] et al. [7] suggested an adaptive feed rate based on the chip thickness and the different types of tool motions. [PERSON] et al. [8] proposed a method to generate the flank milling paths of ball-end-mill tools in five-axis CNC machining. [PERSON] [9] examined how tool-path planning and generation can be used to decrease the total cycle time in five-axis milling. [PERSON] et al. [10] presented a jerk minimization algorithm in the context of multi-axis flank CNC machining, the tool path of which was reparameterized with a B-spline function. [PERSON] et al. [11] investigated how the total machining can be reduced and presented a multi-pass tool-path generation method for flank milling of thin-walled workpieces at the semi-finish and finish machining stages. With regard to the issue of chatter suppression [12; 13; 14], [PERSON] et al. [15] showed that a microphone can provide a proper and consistent signal for reliable chatter detection and control using frequency domain processing and deterministic frequency domain chatter theory. [PERSON] et al. [16] determined the stability lobe diagram (SLD) for a milling process using a sound mapping methodology by collecting the milling process sounds with a microphone placed inside the machine-tool enclosure. Using the semi-discretization method and the geometrical modeling approach, [PERSON] et al. [17] studied the stability of crest-cut tools and analyzed the effect of edge wave geometry on stability. [PERSON] et al. [18] proposed a rapid method for the acquisition of the time-varying modal parameters of a workpiece by combining experimental measurements with the receptance coupling method. To obtain the appropriate milling parameters for scroll manufacturing, [PERSON] et al. [19], for example, used the Taguchi method to optimize the cutting parameters in end milling. They considered the machining processes under semi-fine and fine high-speed cutting conditions and evaluated the milling parameters, such as cutting speed, feed rate, and depth of cut. [PERSON] et al.