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    Kovinski izdelki HRAST d.o.o. CNC Precision Turned Parts

    Techpilot Premium Member
    • Breginj 16
    • 5223 Breginj (Goriska)
    • Slovenia
    • Phone: Show phone number +386-40-502-967
    • Fax: Show fax number +386-5-3849-100
    • E-Mail: contact now
    • Web: Website
    • Premium Member since: 2010
    • last seen online: this week
    • Company data:
    • Employees: 20 - 50
    • Year of foundation: 1984
    • Turnover: 1 - 5 Mil.
    • Certifications:
    • IATF 16949:2016
    • ISO 9001:2008
    • ISO 14001
    • Location:
    Map Location
    • further locations:
    • Western part of Slovenia, close to Italian border. Munchen (3,5h), Ljubljana (2h), Udine (0,5h).
Contact & company data

Contact name

Mitja Hrast

  •  

  • Phone: Show phone number +386-40-502-967
  • Fax: Show fax number +386-5-3849-100
  • E-Mail: contact now

360 Parts Gallery

Pressure housing  

Challenge:

sealing cone to be machined in Ra 0,9

Solution:

costomized cutting tools for additional  smooting of the sealing cone

Special feature:

We used diamond tool to be albe to achive requested surface finish. Tool that was developed is unique due to long tools life and is suitable fro high volume production.

Lotsize:

20000

Material(s):

stainless steel

Size:

20 x 14 x 14 mm

Weight:

0,05 kg

Machining processes:

CNC turning and milling

Item or component:

Component

Production in-house or with partners:

Inhouse

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Adapter for fuel filler

Challenge:

deep drilling in difficult to cut material

Solution:

90 bar high pressure pump in combination with modified geometry on tip of drilling tools

Special feature:

Implementation of high pressure unit on standard CNC lathe helped us to optimized cycle time.

Lotsize:

10

Material(s):

stainless steel 1.4404

Size:

85 x 22 x 20 mm

Weight:

0,07 kg

Machining processes:

CNC turning+deep drilling using  high pressure pump

Item or component:

Component

Production in-house or with partners:

Inhouse

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Housing assembly for fuel injection

Challenge:

Costumer requested form us to supply them assembly of machiend parts. For assembly process screwing and cold forming technology is used. Part is assembled from 3 individual machined components. High corrosion resistance requirement has been solved by using ZnNi plating.

Solution:

Hihg skilled engineering work on preparation of assembly process helped us to get nomination. Automatization of assembly proces gave us competitivness.

Special feature:

This product is excelent ecample of combining machining skills and assembly process.

Lotsize:

20

Material(s):

stainless steel + carbon steel + ZnNi plating.

Size:

110 x 30 x 25 mm

Weight:

0,15 kg

Machining processes:

CNC precision turning, assembly, screwing, welding

Item or component:

Component

Production in-house or with partners:

Inhouse

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Injector cup

Challenge:

Part has very tight position tolerences on milled radius (+-0,025 mm). Costumer requirement is surface finish Ra 0,8.

Solution:

Invstment into machine with robust casting and stable milling tools. Specialized milling tools for production of radius. Additional polishing operation at the end of the production process.

Special feature:

Cpk on most critical dimension achived using dedicated milling tools is > 2.0

Lotsize:

5

Material(s):

stainless steel 1.4301

Size:

25 x 20 x 15 mm

Weight:

0,07 kg

Machining processes:

Turning, drilling, milling, polishing  

Item or component:

Individual Part

Production in-house or with partners:

Inhouse

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Glow plug housing

Challenge:

Deep drilling and reaming of internal holes in H7 tolerance.

Solution:

Dedicated drilling tools using cutting oil under high pressue ensuher us to produce parts in requested tolerance.

Special feature:

Machine and optimized tooling allows fast and competitive produciton.

Lotsize:

50

Material(s):

steel 11SMnPb28

Size:

 95 x 12 mm

Weight:

0,05 kg

Machining processes:

Turnig, thread cutting, drilling, reaming, zinc plating.

Item or component:

Individual Part

Production in-house or with partners:

Inhouse

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Inlet fitting

Challenge:

Smooth threading with no burrors, drilling fo small bore.

Solution:

Inplementation of thread rolling process into turning machine gave us excelen results on thread quality. To be able to drill bores diameter 1 mm high speed spindel has been installed.

Special feature:

Unconventional process of thread rolling and high speed drilling inplemented on CNC turning machine.

Lotsize:

15

Material(s):

stainles steel 1.4301

Size:

30 x 20 x 10 mm

Weight:

0,08 kg

Machining processes:

Turning, thread rolling, high speed drilling

Item or component:

Component

Production in-house or with partners:

Inhouse

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Fitting

Challenge:

Long  drilling into stainless steel material. Challange to enshure high quality of cone sealing surface.

Solution:

Inplemenation of canned cycle drilling in combination of high pressure cooling with cutting oil. Special step drill developed for production of sealing cone.

Special feature:

Canned drilling cycle shortened swarfs and guarantee high quality of drilling and swarf removel during machining process.

Lotsize:

20

Material(s):

stainless steel 1.4511

Size:

55 x 22 x 15 mm

Weight:

0,06 kg

Machining processes:

turning, threading, drilling

Item or component:

Component

Production in-house or with partners:

Inhouse

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Technologies

Machining - Turning

Technology Lotsize Length Width Height Diameter Weight Material Strength

Automatic turning (bar)

10 - 1000000 0.5 mm -
250 mm
-
-
1 mm -
65 mm
- -

Full-range turning (including milling)

10 - 1000000 0.5 mm -
250 mm
-
-
3 mm -
65 mm
- -

Swiss turning

10 - 1000000 0.5 mm -
600 mm
-
-
1 mm -
30 mm
- -

Turning

10 - 5000000 0.5 mm -
250 mm
-
-
3 mm -
65 mm
- -
further Technologies

Company description

Kovinski izdelki Hrast d.o.o. is a well established and experienced precision engineering company manufacturing millions of precision CNC turned parts and machined components to customer specifications. Since 1985 we supply precision machined components from 2mm to 52mm diameter to many diverse industries worldwide.

With continuous investment in the latest technologies whilst maintaining our traditional capacity and skills, we can compete in volume with emerging economies but with the backing of European sourced materials, full traceability, and friendly and efficient service. This, alongside the latest cleaning, inspection equipment and highly skilled workforce, makes Kovinski the ideal choice for all your subcontract needs.

Process organization of the Kovinski izdelki Hrast d.o.o. complies with the guidelines of IATF 16949 technical specifications.We are using lates measurement equipement to enshure to be able to measure microns. We are using contact and non contact measurements methods.According to costumer needs we can offer 100% control with cameras, SPC anaysis of measured dimensiones and CMM measurement of complex geometries.

We ensure full traceability from raw material to finished components.

Creating dedicated component-specific quality plans:

- Producing bespoke gauging
- Supporting machine capability SPC
- Using non-contact optical measuring equipment
- Creating FMEA, process capability and full PPAP level 5 documentation when required
- Allowing IMDS entry
- Providing certificate of conformity with every delivery

We produce precision machined components from 2mm to 52 mm diameter. Our customers are from automotive, electro, white goods, hydraulic, pneumatic and machine building industries.
Using up to date production and quality equipment we can offer machining of parts from different raw materials like:

Stainless steel (austenitic, ferritic, martensitic)
Aluminum (bars or casted parts)
Carbon and hardened steel (ETG, forged steel, steel for heat treatment)
Brass

Products for automotive industry.

- sensor housings
- screws
- pins
- pivot pins
- shafts
- connectors
- bolts
- washers
- bushes
- nuts
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Company images

Materials

  • Steel

    • Structural steel
    • Case hardening/tempering steel
    • Stainless steel (rust-proof V2A)
    • Stainless steel (rust-proof V4A)
    • Free-cutting/mild steel
    • Tool steel
    • Spring steel
    • Cold extruding steel
  • Cast metals

    • Cast steel
    • Cast iron
  • Light metals

    • Aluminium and aluminium alloys
    • Magnesium and magnesium alloys
    • Titanium and titanium alloys
  • Heavy metals

    • Copper-zinc alloys (brass)
    • Copper and copper alloys
    • Zinc and zinc alloys
    • Solder
  • Plastics/synthetic materials

    • Thermoplastics
  • Sintered materials

    • Metal powder for formed parts
    • Metal powder for hard metal
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Industries

  • Automotive and vehicle construction
  • Fittings engineering
  • Office machinery and supplies
  • Railway and rail vehicles industry
  • Electrical industry
  • Precision engineering, mechatronics and optics
  • Hydraulic and pneumatic industry
  • Air conditioning, refrigeration and ventilation industry
  • Boiler, container and tank construction
  • Aerospace and aviation industry
  • Military engineering
  • Furniture industry
  • Telecommunication industry
  • Machine tool manufacturing
  • Lighting industry
  • Drive and gear engineering
  • Mechanical engineering
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References

Mahle., Hidria, Eberspaecher GmbH, Unipart Ltd, Nobelautomotive
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