What should we do if the burrs cannot be removed completely when the edges are curled, turned over or collapsed?

Deburring, descaling, chamfering and polishing process of CV joint for automobile parts

The CV joint is an important component of the ball cage universal joint, a steering component of the car. On its drum-shaped side wall, six window holes are milled by CNC to install the steel balls responsible for rotation. If there are burrs on the inner wall of the window hole, then over time, the car will make a “clicking” noise during driving or turning. Therefore, the last process in the product production process is deburring and finishing. The commonly used polishing process is to use the vibrating deburring process to put the CV joint into the working bowl of the vibratory finisher for batch deburring. One disadvantage of this process is that the burrs on the edge of the window hole will have a flanging and curling phenomenon, which cannot be removed cleanly; at the same time, collisions between products will cause bumps and wounds. Today we will share how to improve and optimize the process of a 20 chromium manganese titanium CV joint product to solve the problem of unclean burr removal and bumps on the surface of the workpiece. This finishing process method is also suitable for other deburring, deflashing processes such as vibratory, centrifugal barrel, disc finishing where the burrs are not removed cleanly, and the collision between workpieces causes bumps and needs to improve and adjust the finishing and polishing process.

    • jerrylu
    • 2024-06-08


deburring,deflashing,chamfering,finishing,polishing process method for CV joint of auto parts

1. The CV joint before vibratory deburring, finishing, polishing
How to deal with the burrs and curling of the automotive parts cv joint


20 chromium manganese titanium(20CRMNTI)


burr flanging, curling




Ø65*35 MM

Pre-polishing process:


Post-polishing process:


2. Finishing and polishing requirements:
  • deburring
  • No burrs, no bruises
3. Optimization and adjustment of cv joint deburring and polishing:
Process steps: (1) deburring
Machine and equipment centrifugal barrel deburring machine
Speed highest
Abrasive Media angle cut triangle ceramic tumbling media
Abrasive media to workpiece 4:1
Chemical compound finishing liquid
Water appropriate amount,the liquid level is 20mm above the abrasive media
Polishing time 10 minutes
Remark parts picked up manually, rinsed with water
4. Deburring effect comparison after optimized process
deburring, finishing and polishing effects of automotive parts cv joint
anti-collision and deburring effect of the cv joint of automobile parts

5. Additional instructions
  • 20 chromium manganese titanium (20CRMNTI) is a high-quality carburizing steel, which is often used to manufacture transmission parts of automotive parts. It has high strength and toughness, but the commonly used vibratory deburring process often has problems such as incomplete burr removal and collision of workpieces. After optimization, the special high-speed centrifugal barrel finishing machine is now used, which has strong finishing force, high cutting efficiency, and uses special anti-collision jigs and fixtures, thus avoiding the problem of collision between parts. Rough finishing uses heavy cutting force angle cut triangle ceramic deburring media, which can achieve the effect of rapid deburring.

6. Final summary
  • In this case study, we demonstrate the automated deburring, finishing and polishing process of the surface of a 20CRMNTI cv joint of automotive parts.
  • If your product workpiece has burrs, curled edges, collapsed edges, etc. that cannot be removed cleanly, or if the workpieces collide with each other and cause bumps and scratches, and other finishing and polishing problems require professional technical support, you can refer to the above case.

Deburring,deflashing,descaling,polishing method of fuel injector, nozzle, plunger coupling of precision automotive parts

How to deburr, descale, finish and polish the injector nozzle, plunger coupling of automotive parts?

Injector needle valve, injection pump plunger, and delivery valve are precision machined parts that are important components of the fuel system of automotive diesel engines. They are mainly made of carburized steel and high-speed steel made of high-hardness alloy materials. Although the current precision CNC machining lathes are very accurate, some burrs and scales will inevitably be generated during the annealing, cutting, drilling processes of needle valve body or plunger. As a result, the finishing and polishing process of the product surface is particularly important. In this case, we will share a process technology and method for automated and efficient deburring, descaling, polishing and brightening of precision mechanical parts such as plungers, needle valve bodies, and needle valves in diesel engine injection pumps and injector parts. This finishing process solution is also suitable for deburring, descaling and polishing of precision machined parts of other metal materials.

    • jerrylu
    • 2024-06-03


deburring,descaling,deflashing,polishing process method of fuel injection pump,nozzle,plunger,valve of precision automotive parts

1. The fuel injection pump,nozzle,plunger coupling,valve before polishing
burrs,flash,oxide scale before polishing of fuel injection pump,nozzle,plunger,valve of precision automotive parts


alloy carburizing steel, high speed steel


burrs and oxide scale on surface


special-shaped column


D6*70 MM

Pre-polishing process:


Post-polishing process:


2. Finishing and polishing requirements
  • deburring,descaling
  • smooth surface,no burrs and oxide scale
3. Polishing process details of fuel injection pump,nozzle,plunger,valve of precision automotive parts
Process steps (1) deburring,descaling of rough finishing (2) brightening of fine polishing (3) centrifugal spin drying
Machines and equipments centrifugal barrel finishing machine centrifugal barrel finishing machine centrifugal spin dryer
Speed highest highest highest
Tumbling media angle cut cylinder ceramic media straight cut cylinder porcelain media no
abrasive media to workpiece 4:1 6:1 no
Chemical compound finishing compound polishing compound no
Water appropriate amount,the liquid level is 30mm above the abrasive media appropriate amount,the liquid level is 30mm above the abrasive media no
Polishing time 15 minutes 30 minutes 5 minutes
Remark parts separated and picked up automatically, rinsed with water parts separated and picked up automatically, rinsed with water centrifugal spin drying
4. The fuel injection pump,nozzle,plunger coupling,valve after deburring,descaling,polishing
injection pump, nozzle, plunger coupling deburring, descaling, and polishing effect of precision automotive parts
The fuel injection pump,nozzle,plunger coupling,valve after deburring,descaling,polishing

5. Additional instructions
  • There is a shallow oxide layer on the surface of the pinion needle valve, and the burrs on the edge of the cutting surface at the bottom of the cylinder are also relatively slight. The process requires that the dimensional accuracy of the product should not be affected after polishing. Therefore, the time for deburring and removing oxide scales should not be too long. so the polishing machine uses a centrifugal barrel finisher. Small-sized angle cut cylinder ceramic tumbling media are used for coarse finishing. The sharp angle of the ceramic deburring media can reach into the grooves and corners to remove burrs and oxide layers.
    Fine polishing uses precision polishing media without cutting force straight cut cylinder high-density porcelain polishing media, which has a high density and has a polishing and brightening effect, can further reduce the surface roughness.
  • In order to improve the anti-rust performance of the product after water treatment, after fine polishing, use a centrifugal spin dryer to dehydrate and dry the moisture on the inner and outer product surfaces.

6. Final summary
  • In this case, we demonstrated the process of automated deburring, descaling, finishing and polishing of the precision automotive component, such as a fuel injection pump, nozzle, plunger coupling,needle valve of diesel engine parts.
  • If you need professional technical support for deburring, descaling and polishing of precision auto parts, diesel engine fuel injectors, plunger coupling or other precision mechanical parts, you can refer to the above cases:
    Auto parts deburring
    Precision auto parts deburring
    Precision machined parts deburring
    Fuel injector polishing deburring
    Methods for deburring fuel injectors
    Plunger parts deburring
    Plunger sleeve deburring
    Valve core deburring
    Valve body deburring
    Valve block deburring
    Needle valve body spray hole deburring
    Valve body polishing
    How to polish valve core

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