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background-color: transparent;"></a><span style="font-size: x-small;"><a name="bookmark16" style="line-height: 14pt; background-color: transparent;"><span class="6"><span style="font-family: SimSun;">3. </span></span></a><span class="6" style="line-height: 14pt; background-color: transparent;">3软</span><span class="6MicrosoftSansSerif" style="line-height: 14pt; background-color: transparent;"><span lang="EN-US">PLC</span></span><span class="6" style="line-height: 14pt; background-color: transparent;">任务线程的调度</span></span></p> <div class="Section1"> <p class="351" style="margin-bottom:13.9pt;line-height:10.5pt;mso-line-height-rule: exactly;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span style="font-size: x-small;"><span class="350pt"><span lang="EN-US">3. 3. </span></span><span class="352pt">1</span></span></st1:chsdate><span style="font-size: x-small;"><span class="352pt">多线程</span></span><span lang="EN-US"><o:p></o:p></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">多线程程序是指在一个进程中同时运行多个线程，每个线程完成不同的任 务。采用多线程编程可充分利用进程中的共享资源、减少进程切换所需的资源切 换、从而大幅提升</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2">的使用效率，多用于需要花大量时间处理以及处理大量 10数据等耗时的应用程序。</span></span></p> <p class="20" style="margin-top:0cm;margin-right:0cm;margin-bottom:19.15pt; margin-left:0cm;text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;line-height:19.45pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: x-small;"><span class="2">软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统主要是对</span><span class="2TimesNewRoman19"><span lang="EN-US">I/O</span></span><span class="2">输入输出影响区的数据进行处理，采用多线 程编程可提升控制系统的性能，因此在程序启动后主线程会为每个任务创建对应 的线程。然而通用</span><span class="2TimesNewRoman19"><span lang="EN-US">PC</span></span><span class="2">机只有一个</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2"><span style="font-family: SimSun;">,</span></span><span class="2">每一时刻只能执行一个任务线程，多个 线程之间通过快速地进行切换来实现运行。因此要实现软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统多任务 的并行运行就必须对任务线程进行调度，确保每个任务顺序执行。下面在介绍操 作系统调度原理的基础上给出本软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">系统的调度方法。</span></span></p> <p class="351" style="margin-bottom:13.45pt;line-height:10.5pt;mso-line-height-rule: exactly;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"></st1:chsdate><span style="font-size: x-small;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="350pt"><span lang="EN-US">3. 3. </span></span><span class="350pt"><span style="font-family: 宋体;">2</span></span></st1:chsdate><span class="350pt"><span style="font-family: 宋体;">线程调度原理</span></span></span><span lang="EN-US"><o:p></o:p></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">线程是操作系统的最小调度单位。对于通用</span><span class="2TimesNewRoman19"><span lang="EN-US">PC</span></span><span class="2">机而言，计算机操作系统以 轮转方式向每个任务线程提供运行时间片，利用“中断”机制对线程的运行状态 进行切换，从而确保每个任务线程都能得到</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2">时间片而被执行。</span></span></p> </div> <div class="Section2"> <p class="450" align="left" style="margin: 0cm 0cm 10.15pt; line-height: 12pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"></st1:chsdate><span style="font-size: x-small;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="45105pt"><span lang="EN-US">3. 3. 3</span></span></st1:chsdate><span class="45">软</span><span class="45MingLiU1"><span lang="EN-US">PLC</span></span><span class="45">运行系统任务线程的调度</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统需要对系统管理任务、通信任务、程序执行任务以及</span><span class="2TimesNewRoman19"><span lang="EN-US">I/O </span></span><span class="2">读写任务进行调度。通信任务包括软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">与</span><span class="2TimesNewRoman19"><span lang="EN-US">HMI</span></span><span class="2">进程的通讯任务、软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">与软 </span><span class="2TimesNewRoman19"><span lang="EN-US">CNC</span></span><span class="2">的通讯任务，</span><span class="2TimesNewRoman19"><span lang="EN-US">I/O</span></span><span class="2">读写任务包括</span><span class="2TimesNewRoman19"><span lang="EN-US">I/O</span></span><span class="2">读任务和</span><span class="2TimesNewRoman19"><span lang="EN-US">I/O</span></span><span class="2">写任务。每个任务线程对 应就绪、运行、终止和阻塞四种状态，因此对软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统多个任务的调度 可通过改变任务线程的状态来实现。本文结合以下两种方式对任务线程进行调 度。</span></span></p> <p class="20" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:31.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:0cm;line-height:19.45pt;mso-line-height-rule:exactly;tab-stops: 55.65pt;background:transparent"><span style="font-size: x-small;"><!--[if !supportLists]--><span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span><!--[endif]--><span class="2">直接调度</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">直接调度按任务执行的先后顺序设定任务线程的优先级进行调度，使任务线 程队列中的优先级最高的任务优先获得</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2">时间片而被操作系统调用执行。</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2TimesNewRoman19"><span lang="EN-US">RTX</span></span><span class="2">实时子系统提供了 128个线程优先级，其系统内核按照优先级从高到 低的顺序安排任务线程占有</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2">资源。由于采用抢占式调度算法，所以</span><span class="2TimesNewRoman19"><span lang="EN-US">RTX</span></span><span class="2">允 许高优先级的任务打断正在运行的低优先级任务线程，以此抢占对</span><span class="2TimesNewRoman19"><span lang="EN-US">CPU</span></span><span class="2">的控制 权，这非常方便我们对软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统的每个任务线程进行调度和管理。</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">在软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统的设计过程中，系统任务管理线程负责软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">运行系统 所有任务的调度，不应被软</span><span class="2TimesNewRoman19"><span lang="EN-US">PLC</span></span><span class="2">系统中的其它任务线程所打断，因此设置为第 一优先级。通讯任务线程和</span><span class="2TimesNewRoman19"><span lang="EN-US">I</span></span><span class="2"><span style="font-family: SimSun;">/</span></span><span class="2TimesNewRoman19"><span lang="EN-US">O</span></span><span class="2">读写任务线程用于提供操作数和指令，是执行用 户程序的先决条件，所以设置为第二优先级。程序执行任务设置为第三优先级， 其中快速执行任务线程的优先级高于普通执行任务线程。</span></span></p> <p class="20" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:31.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:0cm;line-height:19.45pt;mso-line-height-rule:exactly;tab-stops: 55.65pt;background:transparent"><span style="font-size: x-small;"><!--[if !supportLists]--><span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span><!--[endif]--><span class="2">间接调度</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:19.45pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: x-small;"><span class="2">间接调度采用同步对象进行调度，利用多个任务为争夺同一临界资源引起的 互斥来协调多任务的运行。也就是说只有获得同步对象句柄的任务线程才能被执</span></span><span style="font-size: x-small;">行，对共享资源进行操作，未获得的任务线程只能等待同步对象被释放。</span></p> </div> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: left; text-indent: 24pt; line-height: 19.45pt; background: transparent;"><span style="font-size: x-small;"><span class="2TimesNewRoman15"><span lang="EN-US">RTX</span></span><span class="2">提供四种同步对象</span><span class="2">：</span><span class="2">信号量对象</span><span class="2TimesNewRoman15"><span lang="EN-US">Semaphore</span></span><span class="2105pt2"><span lang="EN-US">、</span></span><span class="2">事件对象</span><span class="2TimesNewRoman15"><span lang="EN-US">Event</span></span><span class="2105pt2"><span lang="EN-US">、</span></span><span class="2">互斥体</span><span class="2"> </span><span class="2TimesNewRoman19"><span lang="EN-US">X</span></span><span class="2">寸象</span><span class="2TimesNewRoman15"><span lang="EN-US">Mutex</span></span><span class="2">和共享内存对象</span><span class="2TimesNewRoman15"><span lang="EN-US">SharedMemory</span></span><span class="2105pt2"><span lang="EN-US">。</span></span><span class="2">其中事件对象</span><span class="2TimesNewRoman15"><span lang="EN-US">Event</span></span><span class="2">具有使用简单、</span><span class="2"> </span><span class="2">易于实现多个任务的同步运行等优点</span><span class="2">，</span><span class="2">所以软</span><span class="2TimesNewRoman15"><span lang="EN-US">PLC</span></span><span class="2">运行系统为每个任务创建了</span><span class="2"> </span><span class="2">相应的事件对象</span><span class="2">，</span><span class="2">利用</span><span style="line-height: 25.9333324432373px;">函</span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">数</span><span class="2TimesNewRoman15" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;"><span lang="EN-US">RtWaitForSingleObjectG</span></span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">等待单个事件对象的信号状</span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;"> </span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">态</span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">，</span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">以及函数</span><span class="2TimesNewRoman15" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;"><span lang="EN-US">RtWaitForSingleObjects</span></span><span class="2105pt2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;"><span lang="EN-US">〇</span></span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">等待多个事件对象的信号状态。当等待时 间达到设定值时，改变当前执行线程的状态，转去执行获得同步事件对象句柄的 任务线程，执行完返回当前任务线程继续执行；若设定的等待时间为</span><span class="2TimesNewRoman15" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;"><span lang="EN-US">INFINITE, </span></span><span class="2" style="line-height: 19.45pt; text-indent: 24pt; background-color: transparent;">则当前任务线程一直等待同步事件对象句柄。这使程序运行过程中只有一个任务 线程能够操作数据共享区，从而保证数据访问的安全性。</span></span></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: left; text-indent: 24pt; line-height: 19.45pt; background: transparent;"><span style="font-size: x-small;"><!--[if gte vml 1]><o:wrapblock><v:shapetype id="_x0000_t202" coordsize="21600,21600" o:spt="202" path="m,l,21600r21600,l21600,xe"> <v:stroke joinstyle="miter" /> <v:path gradientshapeok="t" o:connecttype="rect" /> </v:shapetype><v:shape id="_x0000_s1026" type="#_x0000_t202" style='position:absolute; left:0;text-align:left;margin-left:27.65pt;margin-top:147.6pt;width:11.35pt; height:72.7pt;text-indent:0;z-index:-3;mso-wrap-distance-left:28.1pt; mso-wrap-distance-right:47.05pt;mso-wrap-distance-bottom:67.2pt; mso-position-horizontal-relative:margin' filled="f" stroked="f"> <v:textbox style='layout-flow:vertical-ideographic;mso-next-textbox:#_x0000_s1026' inset="0,0,0,0"> <![if RotText]><![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=101 style='line-height:10.0pt;mso-line-height-rule:exactly; background:transparent'><o:p> </o:p></p> </div> <![if !mso]></td> </tr> </table> <![endif]><![endif]></v:textbox> <w:wrap type="topAndBottom" anchorx="margin" /> </v:shape><v:shape id="_x0000_s1027" type="#_x0000_t202" style='position:absolute; left:0;text-align:left;margin-left:29.65pt;margin-top:287.5pt;width:75.35pt; height:10.5pt;text-indent:0;z-index:-2;mso-wrap-distance-left:28.1pt; mso-wrap-distance-right:5pt;mso-wrap-distance-bottom:5.85pt; mso-position-horizontal-relative:margin' filled="f" stroked="f"> <v:textbox 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class="2">状态，在事 件被触发后变为有信号状态，事件所对应的任务线程获得临界区资源被执行，然 后利用</span><span class="2TimesNewRoman15"><span lang="EN-US">RtResetEventG</span></span><span class="2">函数重置为无信号状态，让软</span><span class="2TimesNewRoman15"><span lang="EN-US">PLC</span></span><span class="2">运行系统触发其它事件 对象，以此协调多任务的运行。软</span><span class="2TimesNewRoman15"><span lang="EN-US">PLC</span></span><span class="2">任务线程的调度过程如图</span><span class="2TimesNewRoman15"><span lang="EN-US">3.8</span></span><span class="2105pt2">所示。</span></span><span class="2105pt2"><span style="font-size: 10.5pt;"><br /> </span></span></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: left; text-indent: 24pt; line-height: 19.45pt; background: transparent;"> </p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: left; text-indent: 24pt; line-height: 19.45pt; background: transparent;"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“五轴数控加工中心软</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Times New Roman";mso-fareast-font-family: 宋体;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN; mso-bidi-language:AR-SA">PLC</span><span style="font-size:9.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">控制系统的研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E6%9C%BA%E5%BA%8A' target='_blank'>数控机床</a> <a href='/index.php?case=tag&act=show&tag=%E4%BA%94%E8%BD%B4%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>五轴加工中心</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=945"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <div class="blank60"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇</strong><a href="/bethel/news/show_944.html">软PLC运行系统的任务划分及实现</a> <div class="blank10"></div> <strong>下一篇</strong><a href="/bethel/news/show_946.html">软PLC指令系统设计</a> </div> <!-- 上下页结束 --> </div><!-- /container --> <!-- 相关文章开始 --> <div class="blank60"></div> <!-- 页面标题开始 --> <div class="title"> <h3><a><a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E6%9C%BA%E5%BA%8A' target='_blank'>数控机床</a> <a href='/index.php?case=tag&act=show&tag=%E4%BA%94%E8%BD%B4%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>五轴加工中心</a> <small>相关内容</small></a></h3> <p></p> <span>——</span> </div> <!-- 页面标题结束 --> <hr class="featurette-divider"> <div class="container list-container"> <!-- 内容列表开始 --> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>11</span> <p>2024-12</p> </div> <h4><a title="U600S五轴加工中心视频" href="/bethel/video/show-3042.html" target="_blank">U600S五轴加工中心视频</a></h4> <p>此视频详细介绍了U600S高性能五轴加工中心各种参数及说明！… <a href="/bethel/video/show-3042.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="六角亭五轴加工工艺" href="/bethel/5-aix/show-2966.html" target="_blank">六角亭五轴加工工艺</a></h4> <p>本文以组合式六角亭模型为实例，分析工艺难点与加工可行性，指出该模型的加工难点是模型形状不规则和整体刚性差，并通过设计新的工艺方案解决加工难点，完成了模型整体的加工。新的加工工艺有助于提高加工效率和精度，为五轴数控加工提供了一个典型案例，对于五轴加工中心数控加工也具有指导作用和重要… <a href="/bethel/5-aix/show-2966.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="自适应控制方法在混联五轴加工中心中的应用" href="/bethel/5-aix/show-2965.html" target="_blank">自适应控制方法在混联五轴加工中心中的应用</a></h4> <p>宇匠数控 备注：为保证文章的完整度，本文核心内容由PDF格式显示，如未有显示请刷新或转换浏览器尝试，手机浏览可能无法正常使用！本文摘要：通过对混联五轴加工中心自适应深度学习控制方法的 研 究，可 知 此 方 法 的 创 新 之 处 在 于：１）建 立 了 机 床 的 运 动 学 … <a href="/bethel/5-aix/show-2965.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心和五轴钻攻中心在机测量探头补偿" href="/bethel/5-aix/show-2959.html" target="_blank">五轴加工中心和五轴钻攻中心在机测量探头补</a></h4> <p>在机测量技术由于其成本低、检测效率高、无需二次装夹等优势被广泛用于零件加工测量当中，使得五轴加工中心和五轴钻攻中心，同时又兼具测量功能。在机测量系统的构成如图1所示，硬件部分主要是由高精度探头、信号接收器、机床整个本体，软件部分由机床控制系统、测量软件等组成[8]。待零件加工完成… <a href="/bethel/5-aix/show-2959.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心进给系统动态误差影响因素" href="/bethel/5-aix/show-2958.html" target="_blank">五轴加工中心进给系统动态误差影响因素</a></h4> <p>加工精度是影响机床性能和产品质量的主要难题，也是制约国家精密制造能力的重要因素。本文以五轴加工中心为对象，针对提升机床精度进行了研究。并且随着科技的发展，精密的仪器和零件在生产实践中占据的分量逐渐增加，在数控机床这种精密机器精度不断提高的同时，必须控制内外界环境的随机影响因素在… <a href="/bethel/5-aix/show-2958.html" target="_blank">[了解更多]</a></p> </div> <!-- 内容列表结束 --> </div> <!-- 相关文章结束 --> <!-- 页底推荐图文产品开始 --> <hr 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