Home >  News

How to Repair Plastic Granulator Sleeve Screw Damage?

Mar. 09, 2020

As a Plastic Granulator Supplier, share with you. The inner surface hardness of the sleeve screw is higher than that of the extruder screw, and its damage is later than that of the extruder screw. The retirement of the sleeve screw is that the inner diameter increases with time.

Plastic Granulator

Plastic Granulator

Its repair method is as follows:

1. The inner diameter of the sleeve screw is machined and trimmed to recast the alloy, the thickness is between 1 "and 2mm, and then finished to size.

2. The sleeve screw with increased diameter due to wear. If there is still a certain nitriding layer, the inner hole of the sleeve screw can be directly bored, ground to a new diameter, and then a new extruder is prepared according to this diameter. Screw.

3. In general, the homogenization section of the sleeve screw wears quickly. This section (5 "7D long) can be trimmed by boring and then equipped with a nitrided alloy steel bushing. Diameter, leaving the normal fit clearance for processing and preparation.

4. It is emphasized here that the two important parts of the extruder screw and the sleeve screw, one is an elongated threaded rod, and the other is a relatively small and long hole. Their machining and heat treatment processes are relatively complicated. It is difficult to guarantee accuracy. Therefore, whether these two parts are repaired or replaced with new ones must be thoroughly analyzed from an economic perspective. If the repair cost is lower than the cost of replacing the extruder screw, it is decided to repair. This is not necessarily the correct choice. The comparison between repair cost and renewal cost is only one aspect. It also depends on the ratio of repair cost to the time spent using the extruder screw after repair and the cost of renewal and the use of the extruder screw. It is economical to adopt a small ratio solution, which is the right choice.

5. The materials used in the manufacture of extruder screws and sleeve screws in imported extruders are 34CrAINi7 and CrMoV9. The yield strength of this material is about 900 MPa. After nitriding, the hardness is above 1000HV, which is both wear-resistant and has good corrosion resistance.

6. Manufacture of extruder screw and sleeve screw. At present, domestic commonly used materials are 45, 40Cr and 38CrMoAlA.

7.Materials for manufacturing extruder screws and sleeve screws.

The energy saving of Plastic Granulator can be divided into two parts: one is the power part and the other is the heating part. Power part energy saving: Most of the inverters are used. The energy saving method is to save the remaining energy of the motor. For example, the actual power of the motor is 50Hz, and you only need 30Hz to produce enough in production. Wasted, the inverter is to change the power output of the motor to achieve energy saving effects. Energy saving in heating part: Most of the energy saving in heating part is energy saving by electromagnetic heater. The energy saving rate is about 30% -70% of the old-style resistance coil. Our company also has Powerful Plastic Crusher on sale, welcome to consult.


Contact us
  • Mobile:+86 138 1984 3291
  • Tel: +86 574 8623 6922
  • E-mail: sales@aumax-plast.com
  • Skype: aumax.plast
  • Add: Ningbo Economic & Tech Development Zone, Xiaogang, Beilun, Ningbo, China