基本车床运营|车床操作解释说明

车床是一种机床，使工件旋转，使得当切削工具与工件接触时，它以芯片的形式去除金属。工件可以在中心之间的机床或通过卡盘处牢固而刚性地固定。为了易于切割材料，切割工具应比工件材料更硬。它应该刚性地握住机器或应该以明确的方式相对于工件喂食。

Arrangements for setting the direction of tool advancement and its rigid holding, are already provided on lathe machine.

车床运营

标准机器是能够处理各种工作的标准机器，并且可以对其进行广泛的操作。专用机器是针对特定目的设计的，仅执行一个或有限的操作。

中心车床是标准车床的示例，因为在本机上我们可以执行以下操作：

(a) Turning
（b）面对
(c) Parting off
(d) Knurling
(e) Thread cutting
(f) Grooving
（g）钻孔
（h）无聊
(i) Reaming

下面详细描述这些操作。

转弯

它是从圆柱形作业的外径移除材料以获得一个或多个成品直径。通常，有三种类型的转弯，如下所示：

（a）简单或平行或平行的转动。
(b) Stepped turning.
(c) Taper turning.

In plain turning machining is done in this way that after removal of material, finished diameter at both the ends of length remains equal.
转弯operation where the entire length is divided in steps of different diameter but each step individually finished by using plain turning is known as stepped turning. Taper turning is the operation in which the material is removed from the job to produce a conical shape. All the three types of turning are shown in Figure 7.13.

Plain Turning and Stepped Turning

在透明的转动时，当围绕车床轴线旋转时，工件在整个长度方向均匀转动，并且切削工具沿着车床轴进给。在加工后，普通或直线转动产生圆柱形表面。

在阶梯式转动中，工件以这样的方式转动，使得整个转动长度它形成不同直径的步骤。
在两端面的面对和定心之后，使用附接到工件的狗载体在中心之间安装了作业，爪载体的弯曲尾部装配到设置在从动板上的槽中。如果工件安装在夹头上，则应注意将其中心accurately with the lathe axis. The trueness of the workpiece held on a chuck is tested by holding a scriber or a dial indicator against the rotating workpiece. Turning tool is clamped on the tool post by keeping its cutting edge approximately at the lathe axis or slightly above it.

锥度转向

Generally, the following methods are used for taper turning :
(a) By swivelling compound rest
(b) By setting over the tail stock
（c）通过锥度转动附件
(d) By forming or broad-nose tool
通过旋转复合休息

This method is used to produce short or steep tapers. The principle of this compound rest is that axis of workpiece rotates parallel to the bed
axis and the cutting tool moves at the desired angle where the compound rest is already swivelled.

Let the swivelled angle of compound rest with lathe axis is ‘θ’. ‘ L’ shows the length, on which taper turning takes place. We can calculate the swivelled angle of compound rest in respect of lathe axis

by following formula : tan θ = ( D – d) / L

其中'd'和'd'分别是较大且较小的直径。

Read more ;使用锥形转向附件锥度转动|好处

Facing

It is the machining of the ends of a workpiece to make the ends smooth. For this operation, the cutting tool is fed perpendicular to the lathe or workpiece axis by means of cross slide.

离去

This operation involves cutting the work-metal into two parts by using parting off tool. Feed to the cutting tool is given in same manner as in case of facing operation.

滚花

它是在圆柱形工作的光滑表面上产生压花菱形图案的粗糙表面的过程。滚花在作业上提供有效的抓握表面，以防止其在手动操作时滑动。滚花，如图7.14所示，可能有两种类型：
(a) straight or parallel, and
(b) diamond type.

滚花is done by means of knurling tool which consists of a set of hardened steel rollers. The teeth are cut on the steel rollers in different图案。对于滚花操作，滚花工具被迫用已经布置在旋转状态的工件。

Thread Cutting

In thread cutting operation, there is a certain ratio of motion between the travel of tool and the rotation of the spindle. This ratio is directly effected by the lead screw which is attached to the lathe spindle through gears. General set up for thread cutting is shown in Figure 7.15.

For cutting threads of different pitches, the stud (driver gear) and lead screw gear (driven gear) are changed as per desired ratio of revolution between the spindle and the lead screw. The ratio between the teeth on stud and lead screw gear can be calculated by the given formula,