Accuracy Analysis of slender bar-like cutters on CNC lathes

Slender Bar-like Cutters On CNC Lathes


The improvement of the accuracy of rod-shaped tools has always been a difficult point in tool manufacturing. The main reason is that the effective part of this type of tool is too long and the cutting edge of the tool is too far from the clamping part during manufacturing.

Accuracy Analysis of slender bar-like cutters on CNC lathes

Accuracy Analysis of slender bar-like cutters on CNC lathes -PTJ CNC MACHINING Shop

Because the cutting edge is too far away from the clamping part, and the chuck has a certain clamping accuracy (usually 0.002 to 0.005mm), before starting to grind,

It is possible that the radial round runout at the cutting edge of the tool has reached 0.005 mm to 0.01 mm (or even greater).

Due to the strong grinding technology used when grinding tools, especially the grooving, the grinding force is large, which causes the tool to deform elastically, and many problems will occur during machining.

If the tool geometry is not symmetrical, the tool’s outer circle size, cutting edge parameters, and shape errors do not meet the requirements. In severe cases, the tool may even be broken.

The following uses the CNC lathe to process the slender rod-like tools to analyze the accuracy of the tool.

1. the impact of machining machine tools on tool accuracy. 

Impact of machine tool accuracy on tool accuracy When manufacturing any tool, the accuracy of the machine tool is the key to determining the tool accuracy.

Slim rod-like tools are no exception. The influence of the support block on the accuracy of the tool The support block equipped with this machine tool is mainly used for CNC machining of slender rod-like tools.

Its position can be adjusted in the horizontal and vertical directions, and it can be positioned according to the actual situation. If the position of the support block in the transverse direction (that is, the axial direction of the tool) is not reasonable,

It is impossible to produce a qualified slender rod-shaped tool. If the support block is too low, the supporting force for the tool is not enough, which will cause the sipe to form an inverted cone in the axial direction; if the support block is too high,

The supporting block is hard against the tool, which will cause the sipe to form a forward taper in the axial direction. Therefore, the accurate positioning of the support block is also important to the accuracy of the tool.

2. the influence of CNC lathe machining grinding wheel on the accuracy of the tool. 

All the parameters of the tool are determined by the relative movement of the grinding wheel and the tool,

Therefore, the diameter of the grinding wheel, the angle at which the grinding wheel directly participates in cutting, the flange length of the grinding wheel shaft, the wear of the grinding wheel, and the granularity of the grinding wheel all affect the accuracy of the tool.

Accuracy of grinding wheel angle measurement or input may be caused when the grinding wheel angle measurement or input is inaccurate: the blade edge width does not meet the requirements; the stepped tool step surface angle does not meet the requirements;

There is an error in the position or angle of the back angle of the tool; there is an error in the groove angle of the chip flute.

3. The cooling effect of the coolant on the grinding area during the machining of hardware parts will directly affect the accuracy of the tool.

Selecting a coolant with good performance and proper cooling pressure will help the coolant enter the grinding zone, take away the cutting heat and chips in time, and effectively reduce the surface roughness of the tool.

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