June 2023 - Tacquet-Industries

Villerest Hydroelectric Power Station, France

Machining of the wheel coat after reloading

In June 2023, we worked on the G1 Group (Kaplan type) of the Villerest Hydroelectric Power Plant, in France, for our customer EDF.

GOAL
TOLERANCES REQUESTED
ACHIEVEMENT

Remanufacture the cylindrical and spherical part of the existing wheel mantle after reloading to return to the original shape and ribs. The portion to be taken back extended over a height of about 1000mm.

Final side of cylinder and sphere: Ø3400mm
Surface Condition: Ra 3.2

Our intervention took place in several stages:

Step 1: Analysis of the subject in our Design Office (feasibility, 3D modeling of the turbine, study and calculations to determine the profile of our shape copying element, implementation of our machine in the 3D work environment).
Step 2: Carrying out pre-work checks (Laser Tracker) by an external company.
Step 3: Installation of our machine on site and machining.
Step 4: Realization of after-work checks (Laser Tracker) by an external company.

The intervention is identical to that of the Fessenheim wheel mantle, but on a smaller diameter. A smaller machine was therefore used for this operation.

3D MODELLING

The machining involved studying and verifying the shape of the copying surface through calculations.

PRE-WORK & MACHINE SETUP

Our machine was installed in the turbine and adjusted with the help of the Laser Tracker.

OVERVIEW AFTER WORK

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Jun 2 2023

Rehabilitation of group G4 (Francis type) 𝘙𝘌𝘝𝘐𝘕

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Revin Hydroelectric Power Plant, France

Rehabilitation of Group G4 (Francis type)

In mid-2023, we worked on the G4 Group (Francis type) of the Revin Hydroelectric Power Plant in France for our customer EDF.

GOAL
TOLERANCES REQUESTED
ACHIEVEMENT

Recovery of different turbine elements
Return of the scope Ø2820 H7 on the wear part and change to diameter Ø2816 H7 after reloading
Return of the scope Ø2875 H7 on the wear part side and change to diameter Ø2872 H7 after reloading
Surface straightening perpendicular to span Ø2875 (1 to 3mm)
Counter-drilling and tapping of 12 M16 holes for fixing the wear part

Cylindricity of diameters Ø2816 and Ø2872: 0.4 mm
Coaxiality / Concentricity of diameters Ø2816 and Ø2872: 0.4 mm
Perpendicularity of upright surface to diameter: 0.2 mm
Straightened surface flatness: 0.3 mm
Depth of drilling / tapping: 0.5 mm
Surface condition: Ra 1.6 minimum

Our intervention took place in several stages:

Step 1: Analysis of the subject in our Design Office (feasibility, 3D modeling of the turbine and the wear part, implementation of our machines in the 3D work environment for the different operations).
Step 2: Carrying out pre-work checks (Laser Tracker) by an external company.
Step 3: Installation of our machines on site and machining.
Step 4: Realization of after-work checks (Laser Tracker) by an external company.

3D MODELLING

3D modeling of the different elements according to the original plans provided by the customer.