Precision Castings

Lost vax investment casting process offers a wider range of performances and ease when it comes to produce both complex and challenging shapes. You’ll get a precise mechanical part, in perfect accordance with the original drawing and per table ISO 8062.

Process

The process begins with a wax replica of the chosen final design, which is bathed in six layers of ceramic coatings, than dried and cooked.
What is achieved is a mould, that can be injected with any liquid metal required. Our foundries ensure the complete process: the cooling phase; shell-breaking and trimming; sanding, polishing, machining plus dimensional inspection.

Sectors

A wide range:

  • INDUSTRIAL VALVES
  • MECHANICAL PARTS
  • AGRICULTURE
  • PUMPS
  • FURNITURE
  • AUTOMOTIVE
  • SHIP BUILDING INDUSTRY
  • TEXTILE INDUSTRY
  • AVIATION INDUSTRY
  • CHEMICAL INDUSTRY

PRODUCTS

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precision casting example
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Mechanical and surface processing

Our foundries also provide additional machining, such as:

TURNING

MILLING

GRINDING

BLASTING

POLISHING

Technical specifications

Table of general dimensional tolerances UNI ISO 8062

RAW CASTING BASIC DIMENSION (mm) TOTAL CASTING TOLERANCE FOR PRECISION CASTING (CT GRADE)
OVER UP TO AND INCLUDING 4 5 6 7
-- 10 ± 0,13 0,26 ± 0,18 0,36 ±0,26 0,52 ±0,37 0,74
10 16 ± 0,14 0,28 ± 0,19 0,38 ±0,27 0,54 ±0,39 0,78
16 25 ± 0,15 0,30 ± 0,21 0,42 ±0,29 0,58 ±0,41 0,82
25 40 ± 0,16 0,32 ± 0,23 0,46 ±0,32 0,64 ±0,45 0,90
40 63 ± 0,18 0,36 ± 0,25 0,50 ±0,35 0,70 ±0,50 1,00
63 100 ± 0,20 0,40 ± 0,28 0,56 ±0,39 0,78 ±0,55 1,10
100 160 ± 0,22 0,44 ± 0,31 0,62 ±0,44 0,88 ±0,60 1,20
160 250 ± 0,25 0,50 ± 0,35 0,70 ±0,50 1,00 ±0,70 1,40

Table of: Linear tolerances - Planarity - Parallelism

THROUGH HOLES (mm) BLIND HOLES (mm)
2 ÷ 4 Ø x 1 Ø x 0.6
4 ÷ 6 Ø x 2 Ø x 1
6 ÷ 10 Ø x 3 Ø x 1.6
> 10 Ø x 4 Ø x 2

In a logic of cost containment we recommend avoiding the adoption of restricted tolerances.

In the table above, the following accuracy classes are indicated:

  • CT 6 for all free quotas where no indication is needed;
  • CT 5 for all functional dimensions where a defined tolerance is required;
  • CT 4 only for quotas where it requires a higher degree of precision and in any case to be agreed with Tamau Italia.

The roughness is defined in the order and is between RA 2.4 and 4.8.

Materials table

CATEGORY REFERENCE STANDARD CHEMICAL ANALYSIS MECHANICAL SPECIFICATIONS
UNI AISI C% Mn% Si% Cr% Ni% Mo% R N/mm² Rs N/mm² A% min. Hardness
CASE-HARDENING STEEL C10 1010 0,07÷0,12 0,3÷0,7 <1,00 (490) (883) (≥294) (12) HRC 55-62
18NiCrMo5 0,15÷0,21 0,6÷0,9 <1,00 0,7÷1,0 1,2÷1,5 0,15÷0,25 (1230) (1520) (≥980) (8) HRC 58-65
QUENCHED AND TEMPERED STEELS C40 1040 0,37÷0,44 0,5÷0,8 <1,00 (700) (840) (≥490) (15) HRC 205-245
39NiCrMo15 0,30÷0,38 0,3÷0,8 <0,75 1,5÷1,8 3,5÷4,0 0,2÷0,4 (1717) (1962) (≥1275) (7) HRC 50-55
BEARING STEELS 100Cr6 52100 0,95÷1,10 0,3÷0,5 <0,75 1,4÷1,65 HRC ≥60
INOX STEELS X5CrNi1810 304 <0,08 <1,50 <2,00 18÷21 8÷ 11 481min. 206 min. 35 HRB 90 max
X2CrNi1811 304L <0,03 <1,50 <2,00 17÷ 21 8÷12 446min. 192 min. 35 HRB 86 max
X5CrNiMo1712 316 <0,08 <1,50 <2,00 18 ÷ 21 9÷12 2÷3 481 min. 206 min. 30 HRB 90 max
X2CrNiMo1712 316L <0,03 <1,50 <1,50 17 ÷ 21 9÷13 2÷3 481min. 206 min. 30 HRB 86 max
X12Cr13 410 0,05÷0,15 <1,00 <1,50 11,5 ÷ 14 <1,00 <0,50 652 min. 515 min. 8 HRB 90-140
X30Cr13 420 0,2÷0,4 <1,00 <1,50 11,5 ÷ 14 <1,00 <0,50 (785) (980) (590) min. (12) HRC 21-30
X8Cr17 430 <0,1 <1,00 <1,00 16 ÷ 18 (440) (640) (245) min. (18) HB 192 max

Design

Tamau helps the customer in design development. We ensure the feasibility of the project suggesting engeneering amendments suitable for the foundry mass production. Read the tips for a correct design.

Rapid Prototyping

We provide prototypes few days after the drawings are approved.
This way our customer can test and even modify the mould while in process. See See how it works