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In the process of deep hole drilling, problems such as dimensional accuracy, surface quality and tool life are often encountered. How to reduce or even avoid these problems is a problem that we need to solve at present. The following are 10 common problems and solutions in deep hole drilling.

1. the larger the aperture, the greater the error.

(1) causes

The design value of reamer outer diameter is too large or the hinge cutting edge has burrs; the cutting speed is too high; the feed speed is too high or the machining allowance is too large; the main deflection angle of the reamer is too large; the reamer is bent; the cutting edge of the hinge cutting edge adheres to the chip lump; when the blade is grind, the cutting edge of the hinge cutting edge is very poor; the cutting fluid selection is not suitable; when the reamer is installed, the surface of the taper handle is not cleaned or the conical surface is bumped; the taper shank is flat. The tail offset is mounted on the spindle of the machine tool after the cone interference; the main shaft is bent or the spindle bearing is loose or damaged; the reamer is not flexible; when the shaft is different from the workpiece and the hand is reaming, the two hands are not exerted evenly, so that the reamer is swaying around.

(2) solutions

According to the specific circumstances, reduce the outer diameter of the reamer, reduce the cutting speed, adjust the feed rate or reduce the machining allowance appropriately, reduce the main deflection angle properly, straighten or scrap the curved reamer which can not be bent, repair with oil stone to be qualified, control the swing deviation within the permitted range, choose the cutting fluid with better cooling performance, and install the reamer before the reamer handle and the spindle hole of the machine tool must be inserted. The oil stain is cleaned, the cone surface is rubbed with oil stone, the grinding reamer is trimmed, the spindle bearing is adjusted or replaced, the floating head is re adjusted and the coaxality is adjusted, and the correct operation is noted.

2. aperture reduction

(1) causes

The design value of reamer outer diameter is too small; cutting speed is too low; the feed rate is too large; the main deflection angle of the reamer is too small; the cutting fluid selection is not suitable; when the grinding tool is worn, the worn part of the reamer has not been worn away, and the elastic recovery has reduced the pore size; when the hinge steel piece is too large or the reamer is not sharp, it is easy to produce elastic recovery, and the pore size is reduced and the inner hole is not round, and the diameter of the hole is not qualified.

(2) solutions

Replace the size of reamer outer diameter; increase cutting speed appropriately; appropriately reduce the feed rate; appropriately increase the main deflection angle; select the oil-based cutting fluid with good lubricity; periodically replace the reamer, correctly sharpen the cutting part of the reamer; when designing the reamer dimension, consider the above factors, or take the value according to the actual conditions; do the experimental cutting, and get the right allowance to sharpen the reamer.

3. hinged holes are not round.

(1) causes

The reamer is too long, the rigidity is insufficient, the vibration is caused when reaming, the main angle of the reamer is too small, the hinge cutting edge is narrow, the reaming allowance is partial; the surface of the inner hole has gaps and cross holes; the surface of the hole has sand holes and blowholes; the spindle bearing is loose, no guide sleeve, or the clearance between the reamer and the guide sleeve is too large, and the workpiece is deformed due to the tight clamping of the thin-wall workpiece.

(2) solutions

The reamer with inflexible reamer can adopt reamer with unequal tooth pitch. The reamer should be rigidly connected to increase the main deflection angle; the qualified reamer is adopted to control the tolerance of hole position in the preprocessing step; the unequal pitch reamer is adopted; the longer and more precise guide sleeve is used; the qualified blank is selected; when the precision hole is reamed with equal pitch reamer, the clearance of the spindle of the machine tool is adjusted. The matching gap of the guide sleeve should be higher or the appropriate clamping method should be adopted to reduce the clamping force.

The inner surface of the 4. hole has a sharp edge.

(1) causes

The reaming allowance is too large; the cutting angle of the reamer is too large; the cutting edge of the hinges is too wide; the holes on the workpiece surface, the sand holes and the spindles are too large.

(2) solutions

 

Reduce reaming allowance; reduce the corner of cutting part; width of grinding edge; select qualified blank; adjust spindle of machine tool.

5. the surface roughness of the inner hole is high.

(1) causes

The cutting speed is too high; the cutting fluid selection is not suitable; the main deflection angle of the reamer is too large, the hinge cutting edge is not on the same circumference; the reaming allowance is too large; the reaming allowance is uneven or too small, and the local surface is not hinged; the reamer cutting part has poor swing, sharp edge, rough surface, too wide cutting edge of hinges, poor chip removal during reaming, excessive wear of reamers, and reaming of the reamer. There are burrs or crumbs; there is a built-up edge at the edge; because of the material relationship, it is not suitable for the zero angle or negative front angle reamer.

(2) solutions

Reduce cutting speed; choose cutting fluid according to machining material; reduce the main deflection angle appropriately, properly sharpen the hinge cutting edge; reduce the reaming allowance properly; improve the position accuracy and quality of the bottom hole before the reaming, increase the reaming allowance; select qualified reamer; repair the width of the cutting edge; reduce the number of reamer teeth according to the condition of the body, increase the space of the chip groove or use the reamer with edge inclination to make chip removal. Smoothly, replace the reamer regularly, and grind the grinding area when grinding; the reamer should take protective measures during grinding, using and transporting, avoid bumping; repair the damaged reamer by replacing the reamer with the super fine oil stone, and use the oil stone to trim, and use the reamer with a front angle of 5 degrees -10 degrees.

The service life of the 6. reamer is low.

(1) causes

The reamer material is not suitable; the reamer burns when it is sharpened; the cutting fluid is not selected properly, the cutting fluid does not flow smoothly, and the surface roughness of the cutting part and the hinge cutting edge is too high.

(2) solutions

According to the selection of reamer material for processing materials, carbide reamers or coated reamers can be used. Strictly control grinding cutting amount and avoid burn; often choose cutting fluid correctly according to processing materials; remove chips from chip groove regularly, and use pressure cutting fluid to finish grinding or grinding.

The accuracy of 7. hinged holes is very poor.

(1) causes

The guide sleeve is worn; the bottom end of the guide sleeve is far away from the workpiece; the length of the guide sleeve is short, the accuracy is poor, and the spindle bearing is loose.

(2) solutions

Changing the guide sleeve regularly; lengthening the guide sleeve, improving the matching accuracy of the clearance between the guide sleeve and the reamer; timely repairing the machine tool and adjusting the clearance of the spindle bearing.

8. reamer blade breakage

(1) causes

The reaming allowance is too large; the hardness of the workpiece is too high; the cutting edge deviation is too large, and the cutting load is not uniform; the main deflection angle of the reamer is too small to increase the cutting width; when the deep hole or blind hole is hinged, too many chips are left, and the teeth are not cleaned in time.

(2) solutions

Modify the diameter of the pre processed hole; reduce the hardness of the material or replace the reamer or carbide reamer with negative front angle; control the difference of the pendulum in the qualified range; increase the main deflection angle; pay attention to the timely removal of chips or the reamer with edge inclination; and pay attention to the quality of grinding.

9. reamer shank fracture

(1) causes

When the reaming allowance is too large, the coarse and fine reaming Allowance Distribution and cutting parameter selection are not suitable when the hinged hole is used.

(2) solutions

Modify the pre machining aperture size, modify the allowance distribution, choose the cutting amount reasonably, reduce the number of reamer teeth, Jia Darong chip space or remove the tooth gap.

The center line of the hole after 10. reaming is not straight.

(1) causes

The deflection of the hole before reaming, especially when the hole is small, can not be corrected due to the poor rigidity of the reamer. The main deflection angle of the reamer is too large; the steering is not good enough, so that the reamer is easy to deviate from the direction in the reaming; the cutting part is too big; the reamer moves in the middle part of the intermittent hole; when the hand reaming, it exerts too much force in one direction, forcing the reamer to deflect to one end and destroy it. The perpendicularity of reaming.

(2) solutions

Increase reaming or boring process correction holes; reduce the main deflection angle; adjust the appropriate reamer; replace the reamer with guide parts or lengthened cutting parts; pay attention to proper operation.
Fixed word: 189-3829-0275 Fax: 0769-81090104
Dongguan Li Kun CNC Co., Ltd.
Miss Lin: 189-3829-0275
Mr. Luo: 136-6578-2166
No. 1, Chau Tun old road, Changping Town, Dongguan
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