What are all the types of boring machining What are the types of boring machining

Boring, which is widely used in machining, is an important process. It is capable of boring not only individual holes, but also holes, grooves and flat surfaces. Since the surface shape and dimensions of the workpieces are not the same, theProcessing methodIt's not exactly the same anymore.

The basic methods of boring operations can be classified as follows:

According to the boring support situation, can be divided into overhanging boring and support boring.

According to the type of machine, it can be classified into historical boring and horizontal boring.

According to the main cutter of the boring tool, it can be divided into single-edged boring and double-edged boring.

According to how many holes are processed, it can be divided into push boring and pull boring.

The characteristics, advantages and disadvantages of overhang boring and support boring are described here in terms of the support of the boring bar and also in terms of the feed pattern.

Overhung Boring Method

A boring method called overhanging boring method, it is the use of overhanging boring bar, for medium hole diameter and not through the same axis hole system to carry out the means of boring processing. Extension boring method belongs to the boring machine of the main processing methods, in the short bed boring machine for boring holes, basically more than the use of extension boring this method, in the no rear column boring machine boring holes, most of the time is also the use of extension boring method, in the CNC boring machine on the boring holes, basically the same is the use of extension boring method.

1. Advantages of Overhang Boring Method

(1) Single holes and coaxial holes where the hole axis is not too long can be bored.

(2) The rigidity of the boring bar used is high, and the cutting speed is higher than that of supported boring, resulting in higher productivity.

(3) It is easy and time-saving to install and adjust the single-flute boring tool or boring block on the overhanging boring bar.

(4) The entrance to the overhang boring is spacious, which facilitates observation of the machining conditions. The ability to measure with common precision gauges makes it easier to ensure the quality of the workpiece. Compared with other boring methods, the auxiliary time is shorter and the productivity is higher.

(5) If the table feed method is used to carry out processing, in view of the good straightness of the table guideway, the straightness of the boring hole is also good. Boring accuracy is basically determined by the accuracy of the machine tool itself, in the semi-fine boring and fine boring when appropriate to use the table feed method to implement processing.

2、Disadvantages of overhang boring method

In the overhang boring method, if the spindle feed method to carry out processing, in view of the boring machine spindle continues to extend, its rigidity will gradually reduce, under the action of the cutting force, the spindle in different processing position of the deformation is not the same, boring out the hole diameter is not the same. In addition, with the increase of spindle extension, its own weight induced by the bending is also changing, and then the spindle axis to produce bending, boring out the hole axis will follow the spindle axis bending and bending, affecting the hole size accuracy, shape accuracy, resulting in cylindrical error. In the boring processing precision requirements are not high when the hole can be used spindle feed method processing. In semi-fine boring, fine boring hole should not be used spindle feed method.

Supported Boring Method

When boring the same axis holes of a box type workpiece, the axis of the hole is relatively long, and it is also a through hole. At this time, if you continue to use the overhang boring method to carry out processing, in view of the boring bar overhang is very large, the boring bar axis of the deflection value may be beyond the requirements of the workpiece processing, be bored out of the hole will not reach the drawings of the technical requirements of the provisions of the hole. In this case, the head of the boring bar is generally used to extend into the boring machine tailstock sleeve for boring processing, this boring processing method is usually called the support boring method.

1、Advantages of Support Boring Method

(1) The supported boring method greatly increases the rigidity of the boring bar compared to the overhanging boring method.

(2) The support boring method is suitable for processing the kind of through the same axis hole system, it can ensure that the hole size accuracy, as well as the coaxiality of each hole on the same axis to meet the requirements.

2、Disadvantages of support boring method

When machining coaxial bores, it is sometimes necessary to install multiple boring tools of different sizes on the same bar, which makes loading, unloading and adjusting the boring tools troublesome and time-consuming. Especially when machining the holes on the inner partitions of the box type workpieces, it is difficult to observe the machining conditions and it is not possible to measure them with the common gauges.