What is the purpose of the machine tool with a half missing center?

The center is one of the commonly used machine tool accessories, and the center is used in many occasions and machine tools to increase the rigidity of the workpiece and improve the machining accuracy when machining shaft parts. Here we will mainly explain the characteristics and uses of the "half-missing top".

Notice no, the semi-missing apex is a fixed apex (commonly known as the "dead apex"), and there has never been (at least I haven't come across) a rotary apex (commonly known as the "live apex") to do semi-missing. Well, that is to say, the gap of the semi-missing top is exquisite.

In fact, when we use a fixed center, one end of the workpiece is supported by the center. Then (taking turning as an example), you can imagine that if the diameter of the head is very small, and you have to do more precise machining; Or if you need to machine this end face, it will be difficult for the tool to get close to the workpiece to complete the work, and if you are not careful, the tool will touch the top. Grinding is more difficult, and the grinding wheel has to go beyond the width of at least one wheel of the workpiece.

Therefore, simply cut off a piece of the top obstruction, so that it is much more convenient and safe. Therefore, the notch with a half-missing center is used to make room for the tool.

In this case, the half-missing position should be done just as well: stay in the way of the cutter. lathe, half missing left on the operator's side; The internal and external cylindrical grinding machine, left opposite the operator, is the side where the grinding wheel is located; Horizontal milling is left on it, which is the side where the disc milling cutter is located.

If you don't keep the slewing center, it's useless to keep it.

A semi-missing apex is a fixed apex with a large semi-conical head cone. Choose high-quality semi-lack top, I personally think that the top quality of Tihao is still good.

Chinese name: Half missing top.

English name: half-conical center Definition: The head cone is the fixed tip of a large semi-conical cone.

Applied disciplines: mechanical engineering (first-level discipline), machine tool accessories (second-level discipline).

The No. 4 semi-missing alloy tip is essentially the same as the No. 4 Morse taper. Regardless of which semi-missing alloy tip, the Morse taper is required. A semi-missing alloy tip is a fixed tip with a large semi-conical head cone.

The fixed center supports parts with complex end faces and parts that do not allow center holes. One side can top the center hole or the inner hole of the tube, and the other side can top the end face, which is a spherical or tapered part used for machining and cutting the outer round bow and arrow, and the center is fixed by a clamping device. There is no need to clamp the workpiece with a chuck in the machining, as long as the workpiece can be cut axially with the top of the tailstock of the lathe, which is very simple to use, time-saving and labor-saving, and can effectively reduce labor intensity and speed up.

A semi-missing alloy thimble is a fixed ejector pin with a large semi-cone on the head. Fixed thimble and alloy thimble are parts used in machining, ordinary thimble is made of high-carbon steel, simple to install, cheap. The alloy thimble is made of alloy, which has a long service life, high temperature resistance, and is widely used, among which the alloy thimble is the most widely used.

The use and characteristics of alloy fixed ejector pin: alloy fixed thimble is generally widely used in turning centers and cylindrical grinding machine processing, characterized by high positioning accuracy, not easy to wear, long service life, high temperature resistance, convenient and fast clamping workpiece, simple installation.

Features of fixed thimbles:

1. Pre-standard tungsten carbide top center;

2. The top core of tungsten carbide is made of SK2, and the hardness reaches 75HRC2;

3. Both the top center and the body need to be precision ground to meet the requirements.

Fixed ejector pins support parts with complex end faces and parts that do not allow center holes. The thimble is mainly composed of a thimble, a clamping device, a housing, a retaining pin, a bearing and a mandrel. One end of the ejector pin can top the center hole or the inner hole of the tube, and the other end can be a spherical or tapered part with the top end, and the thimble is fixed by a clamping device.

When the part does not allow or cannot make a center hole, the turning can be clamped directly with a clamping device. The shell and mandrel are drilled with pin holes, and the pins of the fixed pins are used to enter or remove them to realize the dead and alive use of the thimble.

Machine tool ejector pin, machine tool parts in machining, there are two kinds of rotary ejector pins and fixed ejector pins. The ejector pin can be used to support parts with complex end faces and parts that do not allow a center hole to be punched. The thimble is mainly composed of a thimble, a clamping device, a housing, a retaining pin, a bearing and a mandrel.

One end of the ejector pin can top the center hole or the inner hole of the tube, and the other end can be a spherical or tapered part with the top end, and the thimble is fixed by a clamping device. When the part does not allow or cannot make a center hole, the turning can be clamped directly with a clamping device. The shell and mandrel are drilled with pin holes, and the pins of the fixed pins are used to enter or remove them to realize the dead and alive use of the thimble.

Ejector pins can also be used for drilling, threading and reaming workpieces.

The No. 2 semi-missing alloy tip is essentially the same as the No. 2 Morse taper. Regardless of which semi-missing alloy tip, the Morse taper is required. A semi-missing alloy tip is a fixed tip with a large semi-conical head cone.

The fixed center and the alloy center are all parts used in machining, and the ordinary center is made of high-carbon steel, which is simple to install and cheap. The alloy tip is made of alloy, which has a long service life, high temperature resistance, and is widely used, among which the alloy tip is the most widely used. Uses and characteristics of alloy fixed centers:

The alloy fixed center is generally widely used in the processing of turning centers and cylindrical grinding machines, which is characterized by high positioning accuracy, not easy to wear, long service life, high temperature resistance, convenient and fast clamping of workpieces, and simple installation.

The No. 5 semi-missing alloy tip is essentially the same as the No. 5 Morse taper. Regardless of which semi-missing alloy tip, the Morse taper is required. A semi-missing alloy tip is a fixed tip with a large semi-conical head cone.

The fixed center can be used to support the chain deficit on parts with complex end faces and parts that do not allow to punch a center hole. The center is mainly composed of a thimble, a clamping device, a housing, a retaining pin, a bearing and a mandrel. One end of the center can top the center hole or the inner hole of the tube, and the other end can be a spherical or tapered part with a top end, and the center is fixed by a clamping device.

When the part does not allow or cannot punch the center hole, the clamping device shed can be used to clamp the turning directly. The shell and mandrel are drilled with pin holes, and the pins of the fixed pins are used to achieve the top dead manuscript and live life.