id blind roller burnishing

Conditions under which a workpiece is processed by a rolling tool

  1. The surface of the workpiece before processing

Because rolling processing is the processing method of roller rolling, the roughness of the surface after processing is affected by the height and shape of the convex part (that is, the state before processing).

If the surface state before processing is rough (the convex part is high, and the concave part is deep), the convex part cannot be completely embedded into the concave part, resulting in rough surface processing.

In addition, the shape of the raised part also affects the processed surface. Generally, the better the surface condition before processing, the better the surface condition after processing, and the less abrasion of rolling head. If necessary, an additional procedure can be added.

 

  1. Size of the workpiece before processing

Since rolling processing is the processing method of roller rolling, the diameter of the workpiece before and after processing will change (the inner diameter will expand, the outer diameter will decrease). In order to be able to process into the dimensional tolerance range, this change should be taken into account to determine the size of the previous process. The change in diameter is related to the material, hardness and rolling capacity of the workpiece. Therefore, the size of the workpiece shall be determined after 2-3 trial machining.

 

  1. Drive machinery

The standard model of rolling head has straight shank and morse taper shank. Rolling and cutting machining is different, do not require large torque, small power machine tools can also be used. It can be installed in drilling machine, lathe, hexagonal lathe, boring machine, drilling machine and other equipment for processing, and do not need special equipment.

 

  1. Lubrication and cleaning

Because rolling processing is the use of roller rolling processing, so it will produce fine dust. Dust not only affects the surface quality, but also accelerates the loss of rolling head, so it is necessary to inject a large amount of cutting fluid to remove dust. Low viscosity cutting fluid should be used in rolling processing. High viscosity cutting fluid although lubricity is good, but its cleaning performance is poor, not suitable for rolling processing. The company has rolling processing special rolling lubricating oil, as long as the low viscosity cutting fluid mixed with 5% rolling lubricating oil, can play its outstanding performance.

 

  1. Wall thickness of the processed part

Rolling processing is the use of roller rolling processing part of the surface to make it compact. Therefore, in order to be able to withstand the pressure of processing, the waiting part should have a full wall thickness (20% of the inner diameter). If the wall thickness is too thin or part of it is thin, it will fluctuate or decrease the roundness after processing.

Usually according to the following methods to solve the problem: (1) reduce the rolling amount; (2) use fixtures to support the periphery; (3) roll machining is carried out before cutting thin wall thickness.

 

  1. Hardness of the processed part

The upper limit of hardness of workpiece machinable by rolling head is 40HRC, but we also specially manufacture rolling head for high hardness workpiece (the upper limit of hardness is 55HRC). When rolling the workpiece with high hardness, the tool life will be shortened due to the large pressure that the processed part bears. Therefore, in order to obtain the machining surface with required precision, the main measure is to reduce the rolling amount.

 

  1. Speed and feed

Rotate the rolling head to the right for rolling processing; The rolling head can also be fixed and the workpiece can be rotated to get the same result. The rotational speed and feeding speed are different according to the machining diameter.

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How much do you know about hole machining?

In machining, hole machining accounts for about 1/3 of the total machining. Hole machining is semi-enclosed cutting. Chip removal, heat transfer, cutting liquid cooling are all difficult, especially more difficult hole deep processing.

 

The classification of the hole:

  • 1) by shape: there are cylindrical holes, conical holes, drum holes, polygonal holes, spline holes and other special-shaped holes (such as curved holes), etc. Among them, cylindrical holes are most widely used.
  • 2) by form: there are through-hole and blind hole (blocked hole); Deep hole (L/D = 5 ~ 20 is a general deep hole, L/D is a medium deep hole, L/D is a medium deep hole, and L/D﹥30 ~ 100 is called a special deep hole) and a shallow hole.
  • 3) according to the size of aperture: there are big holes (D﹥100mm), ordinary holes (D = 10~100mm), small holes (D=1~10mm) and micro holes (D < 1mm).
  • 4) according to the processing mechanism: mechanical processing, special processing, electromechanical compound machining, etc. Although there are many special machining methods, the traditional machining will still be the main method of hole machining because of the expensive equipment and low processing efficiency.
  • 5) according to the machining accuracy: Rough machining holes (such as holes after boring and rough boring), semi-fine bore (such as reaming, coarse ream, semi-fine boring hole) and precise hole (such as fine hinge, fine pull, fine grinding, honing, grinding hole). Precision holes generally refer to tolerances above grade IT7 – IT6 and surface roughness is Ra﹤ 0.8~0.4m. Its geometrical shape precision (such as roundness, cylindrical degree, axis straightness, etc.) is generally specified in the range of 1/2 ~ 1/3 of its dimensional tolerance band.

With the rapid development of aerospace, automobile, high-speed train, wind power, electronics, household appliances, energy, mold, hydraulic, machine tool and precision machinery and other equipment manufacturing industries and the upgrading of products, the application of precision holes is increasing day by day.

 

Characteristics of hole machining:

Hole machining is a complex process, which must solve the problem of chip removal, cooling, lubrication and guidance. Hole machining has a wide range of applications. The quality of its processing will directly affect the use and life of the product. The cutting mechanism of hole machining is complex, the cutting tools are various, and the machining is difficult. In mechanical parts, the precision and surface roughness of the hole are required to be improved day by day. Precision hole machining is often the key to production. In order to improve the economic efficiency of hole processing, many factories use advanced cutting tools: polygonal rotary broaching tools, single blade boring reamer of cemented carbide, precision diamond burnishing tools or cubic boron nitride reamer, roller burnishing tools and other new processes.

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RBT is the one-stop solution provider for burnishing hole. Our burnishing tools covers roller burnishing tools, skiving burnishing tools, rotary broaching tools, deburring and chamfering tools, external roller burnishing machines, etc. Since the company was founded in 2007, we have served over 2,000 customers worldwide. Welcome new and old customers come to the consultation to discuss!

id blind roller burnishing

Characteristics of NC cutting tools

NC cutting tools have many different requirements than those used in general machine tools.

The characteristics of NC tools are different from those of ordinary tools.

  1. good rigidity (especially rough cutting tools), high accuracy, low vibration resistance and thermal deformation.
  2. It has good interchangeability and is convenient for quick tool change.
  3. Life is high, cutting performance is stable and reliable.
  4. The size of the cutter is easy to adjust, so as to reduce the tool changing time.
  5. The cutting tool should be able to reliably chip or chip, so as to facilitate chip removal.
  6. Serialization and standardization are conducive to programming and tool management.

The difference between internal hole grinding processing and Rolling Machining

The difference between grinding processing and Rolling Machining

Both the internal hole grinding process and rolling finishing process can improve the dimension accuracy of parts and reduce the surface roughness. But there are the following differences:

The difference between internal hole grinding processing and Rolling Machining

Internal hole grinding process

The internal hole grinding has not high requirements for the upper process, and can achieve higher precision than the rolling process. In actual production, it is difficult to reduce the temperature of grinding area in the process of inner hole grinding, and the residual tensile stress, grinding cracks and burns generated in the surface layer will be generated. These can affect the performance of parts and make the production efficiency low.

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Rolling Machining

The rolling process has high requirements on the upper process, which cannot improve the shape accuracy of parts. The size is easy to control because there is no heating in the process. The residual compressive stress and cold hardening produced by the surface layer of parts can improve the performance of parts. It is highly productive.