機(jī)械外文翻譯---基于注塑模具鋼研磨和拋光工序的自動(dòng)化表面處理-模具設(shè)計(jì)-免費(fèi)閱讀
【正文】 通過(guò)使用最佳球面研磨參數(shù)， 試樣 的 表面粗糙度 Ra 值從 約 微米提高到 微米 。 (見(jiàn)圖 9)。因?yàn)?? log 是一個(gè)減函數(shù)，我們應(yīng)當(dāng)使 信噪比（ S/N）達(dá)到最大。 PDS5 試樣的加工 完畢 后 ，裝在大底盤(pán) 上在 三 坐標(biāo) 加工中心進(jìn)行了銑 削，這種加工中心是由 鋼鐵公司 所生產(chǎn) (中壓型三號(hào) ),配備 了 FANUC18M 公司 的 數(shù)控控制器 ( 型 )。這里的 信噪比 （ S/N） ,η, 按下列公式定義 : η =?10 log10 平方等于質(zhì)量特性 =?10 log10 ?????? ??ni iyn 121 （ 1） 這里， yi —— 不同噪聲條件下 所 觀察 的 質(zhì)量特性 n— — 實(shí)驗(yàn) 次數(shù) 從每 個(gè) L18 型正交實(shí)驗(yàn) 得到的 信噪比 （ S/N） 數(shù)據(jù) ，經(jīng) 計(jì)算 后， 運(yùn)用差異分析技術(shù) (變異 )和 殲比檢驗(yàn) 來(lái)測(cè)定 每一個(gè) 主要的 因素 。 三個(gè)層次的 因素 涵蓋了不同的范圍特征 ,并用 了數(shù)字 3標(biāo)明。 磨床 中心正好與具有輔助作用 的圓錐槽線配合 。 我們開(kāi)始自行設(shè)計(jì)和制造的球面研磨工具及加工中心 的 對(duì) 刀 裝置 。 比如 ，人們 發(fā)現(xiàn) , 用碳化鎢球滾 壓的方法可以使 工件表面 的 塑性變形減少 ,從而改善表面粗糙度、表面硬度、抗疲勞 強(qiáng)度。 注塑模具的表面質(zhì)量是 設(shè)計(jì) 的本質(zhì)要求 ,因?yàn)樗苯佑绊懥怂苣z產(chǎn)品的外觀 和性能。 這項(xiàng)研究已經(jīng)完成了磨削刀架 的 設(shè)計(jì) 與 制造 。 Surface roughness Taguchi’s method 1 Introduction Plastics are important engineering materials due to their specific characteristics, such as corrosion resistance, resistance to chemicals, low density, and ease of manufacture, and have increasingly replaced metallic ponents in industrial applications. Injection molding is one of the important forming processes for plastic products. The surface finish quality of the plastic injection mold is an essential requirement due to its direct effects on the appearance of the plastic product. Finishing processes such as grinding, polishing and lapping are monly used to improve the surface finish. The mounted grinding tools (wheels) have been widely used in conventional mold and die finishing industries. The geometric model of mounted grinding tools for automated surface finishing processes was introduced in. A finishing process mode of spherical grinding tools for automated surface finishing systems was developed in. Grinding speed, depth of cut, feed rate, and wheel properties such as abrasive material and abrasive grain size, are the dominant parameters for the spherical grinding process, as shown in Fig. 1. The optimal spherical grinding parameters for the injection mold steel have not yet been investigated based in the literature. . Schematic diagram of the spherical grinding process In recent years, some research has been carried out in determining the optimal parameters of the ball burnishing process (Fig. 2). For instance, it has been found that plastic deformation on the workpiece surface can be reduced by using a tungsten carbide ball or a roller, thus improving the surface roughness, surface hardness, and fatigue resistance. The burnishing process is acplished by machining centers and lathes. The main burnishing parameters having significant effects on the surface roughness are ball or roller material, burnishing force, feed rate, burnishing speed, lubrication, and number of burnishing passes, among others. The optimal surface burnishing parameters for the plastic injection mold steel PDS5 were a bination of grease lubricant, the tungsten carbide ball, a burnishing speed of 200 mm/min, a burnishing force of 300 N, and a feed of 40 μm. The depth of peration of the burnished surface using the optimal ball burnishing parameters was about microns. The improvement of the surface roughness through burnishing process generally ranged between 40% and 90%. Fig. 2. Schematic diagram of the ballburnishing process The aim of this study was to develop spherical grinding and ball burnishing surface finish processes of a freeform surface plastic injection mold on a machining center. The flowchart of automated surface finish using spherical grinding and ball burnishing processes is shown in Fig. 3. We began by designing and manufacturing the spherical grinding tool and its alignment device for use on a machining center. The optimal surface spherical grinding parameters were determined by utilizing a Taguchi’s orthogonal array method. Four factors and three corresponding levels were then chosen for the Taguchi’s L18 matrix experiment. The optimal mounted spherical grinding parameters for surface grinding were then applied to the surface finish of a freeform surface carrier. To improve the surface roughne
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