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Common surface processing schemes and application scope of machinery

Processing scheme of cylindrical surface

Serial number

Processing plan

Economic machining accuracy level (it)

Machined surface roughness Ra(μm)

Scope of application

1

Rough cart

11~12

50~12.5

It is suitable for all kinds of metals except quenched steel

2

Rough cart – Semi finish turning

8~10

6.3~3.2

3

Rough cart – Semi finish turning – Lathe Finish

6~7

1.6~0.8

4

Rough cart – Semi finish turning – Lathe Finish – Rolling (or polishing)

5~6

0.2~0.025

5

Rough cart – Semi finish turning – grinding

6~7

0.8~0.4

It is mainly used for quenched steel, but not suitable for processing non-ferrous metals

6

Rough cart – Semi finish turning – Rough grinding – Fine grinding

5~6

0.4~0.1

7

Rough cart – Semi finish turning – Rough grinding – Fine grinding – Superfinishing (or wheel superfinishing)

5~6

0.1~0.012

8

Rough cart – Semi finish turning – Lathe Finish – Finish Turning by Using Diamond Tool

5~6

0.4~0.025

It is mainly used for the processing of non-ferrous metals with higher requirements

9

Rough cart – Semi finish turning – Rough grinding – Fine grinding – Superfinishing (or mirror grinding)

Above level 5

<0.025

Cylindrical machining of high precision steel or cast iron

10

Rough cart – Semi finish turning – Rough grinding – Fine grinding – grind

Above level 5

<0.1

The steps of turning the outer circle, the methods of test run and test measurement:

1. Selection of turning tools: select turning tools according to requirements
2. Cutting steps
(1) Knife setting in driving

  • a. Retract along the opposite direction of feed;
  • b. Accurate depth of cutting;
  • c. Cutting;
  • d. Exit the tool first, then stop.

(2) Note:

  • a. If you want to continue cutting: withdraw along the opposite direction of feed – stop – measure – repeat the above C.D.
  • b. If the cutting is no longer continued: the horizontal tool return – longitudinal tool return – stop – measure.

3. Purpose and method of test run
(1) The purpose of this paper is to ensure the dimensional accuracy of the parts in lathe finish.
(2) Test run method:

  • a. Set the knife while driving;
  • b. Retract along the opposite direction of feed;
  • c. Accurate depth of cutting;
  • d. The length of cutting workpiece is about 2mm;
  • e. Withdraw the tool along the opposite direction of feed and stop the machine;
  • f. Measure the size of workpiece;
  • g. After measurement, if the dimension meets the requirements, the cutting can be started. If it does not meet the requirements, steps C to F should be repeated.

When using the dial, if the handle has been shaken too far or the size is small after trial cutting, the dial can not be directly retracted to the required scale when the tool needs to be retracted, because there is a gap between the middle slide screw and the nut. In order to eliminate the gap, the handle should be retracted half a turn more when retracting, so as to eliminate the gap, and then shake to the required scale value.

20210315123039 46286 - Common surface processing schemes and application scope of machinery

Hole processing scheme

Serial number

Processing plan

Economic machining accuracy level (IT)

Surface roughness Ra (μm)

Scope of application

1

Drill

11~12

12.5

It can also be used to process non-ferrous metals (but the roughness is slightly higher), and the hole diameter is less than 20 mm

2

Drill – hinge

8~9

3.2~1.6

3

Drill – Coarse hinge – Fine hinge

7~8

1.6~0.8

4

Drill – expand

11

12.5~6.3

It can also be used to process non-ferrous metals (but the roughness is slightly higher), but the hole diameter is more than 20 mm

5

Drill – expand – hinge

8~9

3.2~1.6

6

Drill – expand – Coarse hinge – Fine hinge

7

1.6~0.8

7

Drill one ream – ream one machine – ream one hand

6~7

0.4~0.1

8

Drill – (expand) – Pull (or push)

7~9

1.6~0.1

Large scale production of small and medium sized parts through hole

9

Rough boring (or reaming)

11~12

12.5~6.3

In addition to quenched steel, all kinds of materials and blanks have cast or forged holes

10

Rough boring (Rough expanding) half fine boring (fine expanding)

9~10

3.2~1.6

11

Rough boring (coarse expanding) half fine boring (fine expanding) one fine boring (hinge)

7~8

1.6~0.8

12

Rough boring half fine boring fine expanding fine boring floating boring block fine boring

6~7

0.8~0.4

13

Rough boring (expanding) half fine boring and grinding

7~8

0.8~0.2

It is mainly used for processing quenched steel and non quenched steel, but not suitable for non-ferrous metals

14

Rough boring (expanding) half fine boring rough grinding fine grinding

6~7

0.2~0.1

15

Rough boring half fine boring fine boring diamond boring

6~7

0.4~0.05

It is mainly used for non-ferrous metal processing with high precision

16

Drilling (expanding), rough reaming, fine reaming and honing

Drilling (expanding), pulling and honing

Rough boring half fine boring fine boring honing

6~7

0.2~0.025

High precision hole

17

Replace honing with grinding

5~6

<0.1

18

Drilling (or rough boring) – expanding (semi fine boring) – fine boring – diamond boring – pulse roll extrusion

6~7

0.1

Small holes in non-ferrous metal parts produced in batches, and holes in cast iron box

Quality analysis of car inner hole

1. The dimensional accuracy can not meet the requirements

  • 1) The hole diameter is larger or smaller than the required size: the reason is that the boring cutter is not adjusted properly, the tool tip is not sharp, the hole is deflected and bouncing, and the measurement is not timely.

2. The geometric accuracy can not meet the requirements

  • 1) The inner hole is polygonal and the thickness of the inner wall is uneven.
  • 2) There is taper in the inner hole: the reason is that the center line of the spindle is not parallel to the guide rail, and the guide sleeve of the machine tool may be large.
  • 3) The surface roughness can not meet the requirements: the reason is that the blade is not smooth
  • Sharp, incorrect angle, improper selection of cutting parameters, insufficient coolant.

Plane processing scheme

Serial number

Processing plan

Economic machining accuracy level (IT)

Surface roughness Ra (μm)

Scope of application

1

Rough cart – Semi finish turning

8~9

6.3~3.2

End face

2

Rough cart – Semi finish turning – Lathe Finish

6~7

1.6~0.8

3

Rough cart – Semi finish turning – grinding

7~9

0.8~0.2

4

Rough planing (or rough milling) – finish planing (or finish milling)

7~9

6.3~1.6

General non hardened plane (end milling roughness can be lower)

5

Rough planing (or rough milling) – finish planing (or finish milling) – scraping

5~6

0.8~0.1

Non hardening plane with high precision requirement

When the batch is large, the plan of wide blade fine planing should be adopted

6

Rough planing (or rough milling) – finish planing (or finish milling) – wide edge finish planing

6~7

0.8~0.2

7

Rough planing (or rough milling) – finish planing (or finish milling) – grinding

6~7

0.8~0.2

Hardened plane or non hardened plane with high precision requirement

8

Rough planing (or rough milling) – finish planing (or finish milling) – rough grinding – finish grinding

5~6

0.4~0.25

9

Rough milling – pulling

6~9

0.8~0.2

Mass production, smaller flat

10

Rough milling – finish milling – grinding – grind

Above level 5

<0.1

High precision plane

Economic processing precision refers to the processing precision that can be guaranteed under normal processing conditions (using equipment conforming to quality standards, technological equipment and workers of standard technical level, and not extending processing time).

Source: Network Arrangement – China Flange Manufacturer – Yaang Pipe Industry (www.epowermetals.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@epowermetals.com

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