• Excavator

Corpo de válvula hidráulica

Tudo depende do furo principal. A fabricação de corpos de válvulas é um dos pontos mais importantes no mundo da tecnologia de fluidos. Durante anos, a experiência MAPAL tem sido solicitada para o furo do carretel. A dimensão da folga com o furo do carretel depende da precisão desse furo, de modo que o óleo hidráulico possa fluir na direção necessária sem vazamentos. Isso é definido de forma muito restrita em válvulas hidráulicas modernas. A circularidade, a forma cilíndrica, a linearidade e a qualidade da superfície da superfície desse furo são cruciais.
Valve block

Exigências da usinagem

  • Situação flutuante da tolerância do fundido
  • Corte interrompido severo
  • Evitar a formação de anéis durante o mandrilamento e garantir a remoção segura dos cavacos
  • Evitar falhas macroscópicas nas bordas de controle no processo de mandrilamento
  • Exigências elevadas para tolerância de forma e posição
  • Remoção constante de material antes do brunimento
  • Consideração da variação dos componentes e os espaços limitados de armazenamento das ferramentas no conceito de usinagem

Válvula direcional
As válvulas direcionais são válvulas acionadas mecânica ou eletronicamente com várias posições de comutação. Dependendo da posição especificada da bobina ao longo das bordas de controle, um fluxo com volume é definido para operar o equipamento conectado. O compensador de pressão individual ajusta uma queda de pressão com carga constante através da borda de controle de alimentação do êmbolo, de modo que um controle de fluxo com volume independente da pressão de carga seja obtido em toda a faixa de ajuste, também na operação paralela (compensação de carga). O sistema deve estar livre de vazamentos, para evitar quedas acidentais da carga, mesmo nas operação em paralelo.

Usinagens de furos

Soluções para aplicação

1 – Séries pequenas e médias com ferramentas fixas

Initial situation at the customer

MAPAL Application solution 1

Valve housing EN-GJS-400-15 – spool bore

  • Individual orders, smaller and medium quantities
  • No option for tool setting
  • Short cycle times required
  • High machine hourly rates
  • Stable oscillating honing available
  • Tool concept adapted to several part versions

2 – Large series with solid and adjustable tools

Initial situation at the customer

MAPAL Application solution 2

Valve housing EN-GJS-400-15 – spool bore and compensator bore

  • Large-scale series
  • Tool setting desired
  • High machine hourly rates
  • High costs for subsequent single pass honing

3 – Small lot sizes – Reduced tool changes due to combination tools

Initial situation at the customer

MAPAL Application solution 3

Valve housing EN-GJL-300 – spool bore

  • Small lot sizes
  • Option for tool setting available
  • Too many/frequent tool changes
  • High machine hourly rates
  • High effort due to single pass honing process

4 – Flexible honing on the machining centre

Initial situation at the customer

MAPAL Application solution 4

Valve housing EN-GJS-400-15 – Compensator bore / honing

  • Request for reduction of ancillary costs
  • Existing machining centre re-tooled to TOOLTRONIC
  • Honing for prototype manufacture, as well as small and medium-scale production runs
  • Requirement for saving the honing process on separate machine

5 – Tool management

Initial situation at the customer

MAPAL Toolmanagement

Valve housing EN-GJS-400-15 – complete machining

  • High inventories
  • Processes in the tool-setting area not optimal, and incomplete data quality
  • Cost transparency is not sufficient
  • High fluctuation due to general lack of skilled workers
  • Problems with tool breakage
  • High tool costs

Tool solutions

Piloting and boring
  • Pilotieren

    Solid carbide boring tool

    • Six margin lands for perfect roundness and straightness
    • Optimum chip flow and extended regrinding options through multicut technology and suitable coolant supply

  • Boring

    Solid carbide boring tool

    • Three cutting edges, six margin lands and special lead geometry
    • Straight bore, ideal chip flow und guide across the entire bore length

  • Boring

    Solid carbide boring tool

    • Six margin lands and special lead geometry
    • Straight bore, ideal chip flow und guide across the entire bore length
    • Reduced non-productive times due to two machining operations in one tool

  • Piloting and boring

    Multi-stepped boring tool

    • Radial and tangential indexable inserts
    • Pre-machining spool bore and completion of contours in one processing step

  • MAPAL Boring

    Double edge boring tool

    • Form cutting edges
    • Reliable machining of the contour
    • Easy handling with low cutting material costs

Control edge machining
  • Control edge machining

    Solid carbide circular milling cutter

    • Significant cycle time savings
    • Defined control edges without macroscopic flaws

  • Control edge machining

    Solid carbide profile tool

    • Highest accuracy and surface finish of control edges
    • Defined control edges without macroscopic flaws

Reaming and fine boring
  • Reaming

    Multi-bladed reamer

    • High cutting data
    • Perfect chip control due to left-hand twist and optimum coolant supply

  • Fine boring

    Fine boring tool

    • EasyAdjust system and guide pads
    • Reliable precision machining with easy handling without subsequent honing
    • Best cylindrical forms due to optimum guidance

  • Fine boring

    Fine boring tool

    • Indexable inserts and guide pads
    • Ideal for bar machining of highly accurate and long bores

Fine machining with honing
  • TOOLTRONIC

    MAPAL TOOLTRONIC

    • Significant shortening of production and cycle times
    • Greater contour accuracy

Milling
  • NeoMill-16-Face

    NeoMill®-16-Face

    • 16-edge indexable insert / 45°
    • First choice for cast iron and heat-resistant cast steel
    • ø area 63-200 mm / ap max. 4 mm
    • Low cutting forces despite a negative shape
    • Maximum economic efficiency for face milling

  • NEOMILL-8-CORNER

    NeoMill®-8-Corner

    • Eight-edge indexable insert / 90°
    • First choice for cast iron
    • ø area 50-200 mm / ap max. 8 mm
    • Maximum economic efficiency for shoulder milling

  • NEOMILL-4-CORNER

    NeoMill®-4-Corner

    • Four-edge indexable insert / 90°
    • Highly suitable for steel, stainless steel, cast iron and heat-resistant cast steel
    • ø area 25-100 mm / ap max. 10 mm
    • Multipass milling of high shoulder dimensions
    • Very low cutting forces despite a negative shape

Clamping
  • UNIQ Mill Chuck

    UNIQ Mill Chuck

    • Highly thermal stability from 80 °C even with very long milling cycles (over 240 minutes)
    • For high-performance milling operations up to max. 33,000 revolutions per minute
    • Highest process reliability

  • UNIQ DReaM CHUCK 4.5°

    UNIQ DReaM Chuck, 4.5°

    • Hydraulic chuck with the original dimensions of a shrink chuck (DIN contour with 4.5°)
    • Application-oriented system design
    • Maximum process reliability and tool life
    • Faster und highly precise tool change

  • HB MILL CHUCK SIDE LOCK CHUCK

    HB MILL CHUCK SIDE LOCK CHUCK

    • Easy to handle thanks to use of a differential screw
    • Maximum economic efficiency and precision
    • Axial tool positioning can be defined using spring system
    • Optimum positioning of profile tools for control edge machining