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high grade injection molding machine technology 之教你看波形图!
谓 波形图 is screw 行程（位置） or time is 横坐标, screw pressure or speed degree is 纵坐标, machine 自动绘 made 行程—— pressure, speed degree and time —— pressure, speed degree 曲线.
through comparison analysis can screw in 整 行程 in 任何位置, 任何时时刻 实际 pressure and speed degree. through for this 曲线 特征进行 analysis, 进而推断 type 腔 充填情况并 for injection molding parameters 进行修 positive.
先看原始 波形图, 如图1—24（a） 示. 图 in 3 strip/profile separation is: screw speed 曲线; screw injection shot pressure 曲线; screw speed degree 曲线.
图1—24（b） is screw and injection shot pressure 曲线, screw speed degree upper for 应 特殊点. 图 upper 标示 特殊 screw 位置共12 strip/profile, from right to left （即沿 screw front direction ） separation 别编号 is 1, 2, 3, „„12, rear 面 括符里 数字 is for screw 位置, mono is mm. injection shot pressure upper 特殊 点 use green table/sheet 示, screw speed degree upper 特殊点 use color table/sheet 示.
图1—24（c） is injection shot pressure 点编号, 图1—24（d） is screw speed degree 点编号. its in injection shot pressure use green large 写字母编号, screw speed degree use color small 写字母编号. 如同一 screw upper has or above pressure, speed degree 点, separation in rear add 序号, 如C1, C2 is 同一位置点 upper for 应 两 pressure 点, c1, c2 is and C1, C2 for screw speed degree 点. is 方便观察曲线, in has 特殊点 编号省略, can from its it in 看 出.
图1—24（a） 原始 波形图
图1—24（b） 特殊 screw and pressure, speed degree 点
lower 面我们 for this 一波形图进行 analysis and 说明. 1.A点: is 射胶起始位置, is 抽胶终点位置. comprehensive screw pressure, speed degree, speed can 看出, screw as 熔胶动 as rear to 位置4（15.00）时, 熔胶结束, rear 抽胶4mm to 位置1（19.00）, 抽胶结束. 2.B点: 当 screw front to 位置2（16.91）处, injection shot pressure has 一 突变, front, rear 曲线斜 rate obvious different, 初步判断, B点应 is gate 位置, injection shot pressure upper rise. 3.C点: 当 screw front to 位置8（6.92）处, injection shot pressure again has 一 突变, rear pressure upper rise. 仔 fine 观察, in C点处 screw speed degree has very fine micro 波动并稍 has decline. this is machine 自动反馈, 自动进行 injection shot pressure maintain speed 不变 自动 adjustment process, can 看出, use machine comparison and precision. 初步判断, C点 is type rigid good 满胶 位置. 4.D点: is holding pressure 切换位置点. 位置9（6.100） is holding pressure 切换位置. from 波形图 can 看出, from 射胶开始位置A点 to holding pressure 切换位置D点, injection shot pressure is strip/profile upper rise 曲线, 说明随 充填 retardant force increase, injection shot pressure versus increase large. A→D is 射胶段, its in A→B is water 口充填段, B→C is product 充填段, C→D is pressure shrink 段. screw speed degree in A点 and very fast to setting value, and basic upper maintain 不变. 5.E点: holding pressure 切换D点位置9（6.100） rear, is property function, injection shot pressure also in upper rise, screw also in front to E点位置10（5.800）. from screw speed degree upper 看, speed degree 由d→e1 is decline, screw although in front 进, front speed degree 越 越 slow. e1点以 rear has speed degree basic upper is and X轴垂直 直线, in E点 screw 处于不动状态, speed degree in 发生急剧变化, speed degree positive value is negative value, screw already has rear trend. 6.F点: due to pressure shrink pressure comparison high （约90）, grade holding pressure pressure comparison low （约35）, pressure shrink pressure shrink melt in pressure reduce lower, 体积膨胀会突然爆发, make type in melt relatively fast speed degree 倒流. due to property function, melt 倒流 甚, make type generate negative pressure. 而 negative pressure generate, retardant screw rear 退. from in can 看出, screw 由E点位置10（5.80） rear to F点位置7（7.22）, screw rear 退 1.42mm. F点 位置7（7.22） in C点位置8（6.92） right 侧, 说明倒流 甚. 当 screw rear to F点时, speed degree drop 至接近 is 0, screw rear 退. 7.C1点: in grade holding pressure pressure function lower, screw 由F点位置7（7.22） front to C1点位置8（6.92）, from speed degree can 看出, from f点 to c1点 speed degree 曲线接近 is 0, screw front speed degree non slow. this process, holding pressure pressure low, can for melt 倒流 甚造 molding negative pressure pressure shrink again process. C点, C1点位置 same, is 位置8（6.92）, is type rigid good 满胶 位置. 8.G点: to C1点一 grade holding pressure 结束, formed grade holding pressure. 因 is G点 pressure （约110）远远 high 于C1点 pressure （约35）, therefore pressure shrink melt speed degree very fast 由c1 upper rise to c2, rear grade holding pressure speed degree 由c2持续 to g1 maintain 不变. 9.H点: H点 holding pressure pressure to 波峰, from speed degree can 看出, from g1点 to h点 speed degree very fast decline to is 0, can is from G点 to H点 is pressure upper rise property function. from h点 to g2点 speed degree can 看出, screw is in H点先处于不动 状态, rear speed degree positive value is negative value, screw 由H点位置12（3.91） rear to G点位置11（4.32）. 此 rear due to holding pressure pressure understanding remove, material in pressure melt 体积膨胀, make screw 以接近-50 speed degree from g2点 rear to e2点. 当 screw rear to e2点时, melt pressure shrink generate can basic upper 释放完毕, rear speed degree reduce, to I点位置6（7.73）时, 开始进行熔胶动 as. 10.I点: 熔胶起点. 11.J点: 熔胶终点 is. from I点 to J点 is 熔胶行程, 熔胶终止位置4（15.00）. 此 rear screw as 抽胶动 as, to A点位置1（19.00） and other 待, as is lower 一 循 ring cycle 起点. from injection shot pressure can 看出, 抽胶段 pressure in 0线 below/following, 说明抽胶 screw generate negative pressure. in injection molding technology technology 人员, in 看波形图 时候, 请 time —— injection shot pressure, speed degree and 位置—— injection shot pressure, speed degree and product structure, process parameters combined analysis, can to non 常准确 判断. 
