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4140HD STEEL Turned pins for DEPLOYABLE SCISSOR STRUCTURE TOOL最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

MACHINING PARTS CLEAN BURR METHODS

KYLT Precision CNC Machining — Tue, 12 Nov 2019 18:27:57 +0000

This article introduced some machined parts burr cleaning methods.

Electrolytic deburring

This is to use electric and chemical energy to dissolve the anode and remove the burr. The positive side of the part and the DC power supply is the anode, and the negative side of the forming tool and the DC power supply is the cathode. There is a certain gap between the two sides to let the electrolyte circulate.

Chemical deburring

Put the cleaned metal parts into the chemical solution (50 ℃), and the metal on the surface of the parts will be transferred into the solution in the form of ions. These ions gather on the surface of the machined workpiece and form a layer of viscous film with large resistance and small conductivity through chemical reaction to protect the surface of the workpiece from corrosion, while the burr protrudes out of the surface, and the chemical action will remove the burr.

High temperature deburring

First place the parts to be deburred in the tight sealing chamber, and then send the mixture of hydrogen and oxygen with a certain pressure. After the spark plug ignites, the mixture will explode instantaneously, releasing a large amount of heat, and the instantaneous temperature is as high as 3300 ℃.

Deburring by rolling

A certain proportion of workpieces and abrasives are put into the closed cylinder. During the rotation of the cylinder, grinding occurs between parts and abrasives, and between parts to remove burrs. Zinc die casting parts always use this method to clean burr.

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MACHINING PARTS CLEAN BURR METHODS最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

MILLING CUTTING METHOD TO MAKE SCREW THREAD

KYLT Precision CNC Machining — Mon, 04 Nov 2019 19:44:52 +0000

Screw Thread made by milling cutting method.

Screw Thread made by milling cutting method, refers to the method of machining thread on workpiece with forming tool or grinding tool, mainly including turning, milling, tapping, threading, grinding, grinding and whirlwind cutting, etc.

Final machined Turning Part

When turning, milling and grinding the thread, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves a lead accurately and evenly along the axial direction of the workpiece every rotation of the workpiece. When tapping or threading, the tool (tap or die) rotates relative to the workpiece, and the first formed thread groove guides the tool (or workpiece) to move axially.

CNC turned screw thread part

Thread turning on lathe can use forming turning tool or thread carding tool (see thread processing tool). Turning thread with forming turning tool is a common method for single piece and small batch production of thread workpieces due to its simple structure; turning thread with thread cutting tool has high production efficiency, but its structure is complex, so it is only suitable for turning short thread workpieces with fine teeth in medium and large batch production. The pitch accuracy of turning trapezoidal thread with general lathe can only reach 8-9 levels (jb2886-81, the same below); the productivity or accuracy can be significantly improved when machining thread on specialized thread lathe.

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MILLING CUTTING METHOD TO MAKE SCREW THREAD最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

screw thread cutting

KYLT Precision CNC Machining — Sun, 03 Nov 2019 11:10:09 +0000

Machining workpiece to make screw, which can use cutting method.

what is screw thread cutting?

Generally, it refers to the method of machining thread on workpiece with forming tool or grinding tool, mainly including turning, milling, tapping, threading, grinding and whirlwind cutting, etc.

stainless steel CNC turned part

Thread turning on lathe can use forming turning tool or thread carding tool (see thread processing tool). Turning thread with forming turning tool is a common method for single piece and small batch production of thread workpieces due to its simple structure; turning thread with thread cutting tool has high production efficiency, but its structure is complex. So it is only suitable for turning short thread workpieces with fine teeth in medium and large batch production. The pitch accuracy of turning trapezoidal thread with general lathe can only reach 8-9 levels (jb2886-81, the same below); the productivity or accuracy can be significantly improved when machining thread on specialized thread lathe.

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screw thread cutting最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

Selection principle of cutting parameters for screw thread turning

KYLT Precision CNC Machining — Sun, 03 Nov 2019 09:27:01 +0000

Because the pitch (or lead) of the thread is specified by the drawing, the key to choose the cutting parameters when turning the screw thread is to determine the spindle speed n and the cutting depth AP.

1) SELECTION OF SPINDLE SPEED to do screw thread turning

According to the mechanism that the spindle turns 1 and the cutter feeds 1 lead when turning the thread, the feed speed of the CNC lathe is determined by the selected spindle speed. The thread lead (which is the pitch when the thread is single head thread) instructed in the thread processing program section is equivalent to the feed speed VF VF = n f (1) expressed by the feed rate f (mm / R)

From Formula 1, it can be seen that the feed speed VF is proportional to the feed amount F. if the spindle speed of the machine tool is selected too high, the converted feed speed will greatly exceed the rated feed speed of the machine tool. Therefore, when selecting the rotation speed of the main shaft for turning the thread, the parameter setting of the feeding system and the electrical configuration of the machine tool should be considered to avoid the phenomenon of “disordered thread” or the thread pitch near the start / end point not meeting the requirements.

In addition, it is worth noting that once the thread processing is started, the spindle speed value cannot be changed generally, and the spindle speed including finishing must follow the selected value during the first feed machining. Otherwise, the CNC system will lead to “disordered thread” due to the “overshoot” of the reference pulse signal of the pulse encoder.

Aluminum Precision Machining Part

2) SELECTION OF CUTTING DEPTH TO DO SCREW THREAD TURNING

Because the thread turning is a forming turning, the strength of the cutting tool is poor, and the cutting feed is large, and the cutting force on the cutting tool is also large. Therefore, it is generally required to select a relatively reasonable cutting depth according to the decreasing trend. Table 1 lists the feed times and cutting depth reference values of common metric thread cutting for readers to consult.

Table 1 feed times and cutting depth of common metric thread cutting

feed times and cutting depth of common metric thread cutting

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Selection principle of cutting parameters for screw thread turning最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

SCREW THREAD MACHINING METHOD

KYLT Precision CNC Machining — Sun, 03 Nov 2019 09:26:08 +0000

In Metal parts machining works, screw thread (tapping) be required.

The screw thread is mainly divided into: connecting thread and driving thread

For connecting thread, the main machining methods are: tapping, threading, turning, rolling, etc.

For transmission thread, the main machining methods are: rough and fine turning – grinding；whirlwind milling – rough and fine turning, etc.

CNC turned screw thread part

The following describes the various screw machining methods:

Thread cutting

Generally, it refers to the method of machining thread on workpiece with forming tool or grinding tool, mainly including turning, milling, tapping, threading, grinding and whirlwind cutting, etc.

Thread milling

On the thread milling machine, the disc milling cutter or comb milling cutter is used for milling. Disc milling cutter is mainly used for milling trapezoid external thread of screw rod, worm and other workpieces. Comb milling cutter is used for milling internal and external common thread and taper thread.

CNC turning parts

Thread grinding

It is mainly used to process the precision thread of hardened workpiece on the thread grinder. According to the different cross-section shape of grinding wheel, there are two kinds of grinding: single line grinding wheel and multi line grinding wheel.

Thread grinding

The nut type or screw type thread lapping tool is made of soft materials such as cast iron. The parts of the processed thread on the workpiece with pitch error are grinded by forward and reverse rotation to improve the pitch accuracy. The hardened internal thread is usually eliminated by grinding to improve the accuracy.

CNC lathing parts

Tapping and threading

Tapping is to use a certain torque to screw the tap into the pre-drilled bottom hole on the workpiece to machine the internal thread. Threading is to cut the external thread on the bar (or tube) workpiece with a die.

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Machining precision accuracy of NC & CNC machining parts

KYLT Precision CNC Machining — Tue, 22 Oct 2019 20:20:04 +0000

The machining parts quality includes Machining precision accuracy and Surface quality. Especially for NC lathing parts and CNC machining parts, they are require tight tolerance and good surface.

Precision Accuracy CNC lathing parts

What is machining precision accuracy?

Machining accuracy refers to the degree of conformity between the actual value and the ideal value of the geometric parameters (size, geometry and mutual position) of the parts after machining. The deviation between the actual value and the ideal value is the machining error. The machining error reflects the machining accuracy.

The machining accuracy of parts includes three aspects:

Dimensional accuracy
Geometric accuracy
Mutual position accuracy

There is a connection between these three factors.

Precision Accuracy CNC WEMD, Milling & Assembly part

In machining, the formation of the size, geometry and relative position between the surfaces of the parts mainly depends on the mutual position relationship between the workpiece and the tool in the process of cutting movement. The workpiece and cutter are installed on the fixture and machine tool, and are constrained by the fixture and machine tool.

Precision Accuracy CNC machining prototype

In machining, machine tool, fixture, cutter and workpiece constitute a complete system, which is called process system. The problem of machining accuracy of parts is essentially the accuracy of the whole process system.

Therefore, the designer should reasonably specify the machining parts precision accuracy according to their usage. According to the design requirements and production conditions, the technologists should adopt appropriate process methods to improve the productivity and reduce the cost as much as possible on the premise of ensuring the processing accuracy.

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