VENTLESS  TWIN  SHELL ®  MOLD

Tire molds play a key role in cost and performance of tire manufacturing. Mainstream developments are driven by maintenance cost reduction and the aesthetical appearance of the tire. In an effort to address both, puzzle molds were introduced in the 1990's. This special mold type however, involves an increase in manufacturing cost and is only applicable to simple tread designs.The proprietary Ventless Twin Shell ® Mold technology enables uniting the best of both worlds while applying the proven concept of the puzzle mold, yet with strongly increased design freedom and at reduced cost.


Avonisys laser technology enables:

  ✔︎   Cutting of surface connection slots as narrow as 0.04 - 0.05mm

  ✔︎   Virtual puzzling


Application Examples:

      Substitution of puzzle molds

  ➤    Twin Shell molds

  ➤    Tire tread mold segments made by 3D metal printing


Twin shell technology enables adoption of 3D printed tire molds


3D printing technology in the tire industry

Additive manufacturing technology is already applied in the tire industry today. Complex multi-dimensional sipes for tire molds are generated in significant volumes by 3D metal printing.  Within the tire industry there is also a growing desire to utilise in particular very complex tire tread molds produced by 3D metal printing. To achieve this, 3D printed tire mold segments must be produced time-efficient and with a good surface quality. The Twin Shell mold is a particularly favourable design to achieve exactly that. 


Tire Technology International’s October 2017 issue features an interesting article about additive manufacturing for tire molds.


    Read the article


3D printed tire molds in Twin Shell design

The idea behind the Twin Shell mold design in general, is to split the value added part of the mold - which is the tread - from the heat capacitance part of the mold. By designing the tread part of the mold as a thin yet stable shell, it becomes economically viable for production by 3D metal printing. The bulky backside body of the mold can be conveniently manufactured by conventional casting or direct milling technology. 3D metal printing of tire mold tread shells enables adoption of highly complex tread designs while maintaining cost efficient printing strategies.


By applying surface connection slots analog to the gaps of a puzzle mold, essentially a virtual puzzle is created. To achieve the required through flow as well as cleanability, these surface connection slots are best applied by a Laser Micro Milling post process.


The puzzle mold compared to Ventless Twin Shell ®


Puzzle Mold

Tires from puzzle molds are characterised by their clean surface appearance. Typically only simple treads can be puzzled.


✔︎    Clean surface appearance

    Only for simple treads


Puzzle Mold (old)

Over the life cycle of the mold, cleaning, disassembly and re-assembly can impact the gap size between individual tread pitches.


    Pitch gaps change over life cycle

    Surface appearance degrades


Ventless Twin Shell ® Mold

The puzzle effect is created by surface connection slots in a solid tread shell. Gap size does not change over the mold life cycle.


✔︎    Constant gaps over life cycle

✔︎    No  tread limitations


Air removal from tire molds

The very first issue of 4JET’s technology magazine 4SURfaces from 2006, features an interesting article about various tire mold venting concepts and the strong efforts that are made to produces tires by utilising ventless tire molds.


With Avonisys Laser Micro Milling technology for machining of tire molds, in particular machining of Ventless Twin Shell ® molds, the addressed micro-venting features can now be produced in a practical and cost-effective way.


    Read the article


RELATED  MACHINING  VIDEOS


TIRE MOLD LASER PROCESSING

The Avonisys waterjet laser is an enabling technology for creating a variety of functional micro slots in aluminum and steel tire molds.

Avonisys develops, builds and sells laser systems based on its proprietary waterjet laser technology. Avonisys laser systems are designed to deliver robust performance for demanding applications, while keeping operation simple and maintenance procedures fast and cost effective. Around its core technology Avonisys holds over 20 patents and patents* pending, which include unique features such as a high-power laser coupling method, an Air-Jet protection system and an easy-maintenance laser coupling unit design.



* Patents in Avonisys AG / shareholder portfolio:

US8859988B1, US9085114B2, US10022820B2, US10092980B1, US10272522B2, US10279429B2, US10307864B2, EP1940579B1, EP3092119B1, CN206925459U, CN206926280U, CN107530828B and patents pending.



© 2013-2019 Avonisys AG Terms & Conditions Imprint

Avonisys AG

General-Guisan-Str. 6

6300 Zug, Switzerland

Tel.  +41 41 229 48 73

Fax  +41 41 229 48 74

contact (@) avonisys.com

Avonisys develops, builds and sells laser systems based on its proprietary waterjet laser technology. Avonisys laser systems are designed to deliver robust performance for demanding applications, while keeping operation simple and maintenance procedures fast and cost effective. Around its core technology Avonisys holds over 20 patents and patents pending*, which include unique features such as a high-power laser coupling method, an Air-Jet protection system and an easy-maintenance laser coupling unit design.



* Patents in Avonisys AG / shareholder portfolio:

US8859988B1, US9085114B2, US10022820B2, US10092980B1, US10272522B2, US10279429B2, US10307864B2, EP1940579B1, EP3092119B1, CN206925459U, CN206926280U, CN107530828B and patents pending.



© 2013-2020 Avonisys AG Terms & Conditions Imprint

Avonisys AG

General-Guisan-Str. 6

6300 Zug, Switzerland

Tel.  +41 41 229 48 73

Fax  +41 41 229 48 74

contact (@) avonisys.com