• Excavator

Hydraulic valve housing

Everything depends on the main bore. Manufacturing valve housings is the supreme discipline in the world of fluid power. For years, MAPAL’s expertise has been in demand for the spool bore. The gap dimension with the spool depends on the accuracy of this bore, so that the hydraulic oil can only flow in the required direction without leaking. This is very narrowly defined in modern hydraulic valves. The roundness, cylindrical form, straightness and surface finish of this bore are therefore crucial.
Valve block

Machining requirements

  • Fluctuating cast allowance situation
  • Heavily interrupted cuts
  • Avoid ring formation during boring and ensure safe chip removal from the housing
  • Avoid macroscopic flaws on the control edges in the boring process
  • Very high demands on form and position tolerance
  • Constant stock removal before honing
  • Take part variance and limited tool storage places in the machining concept into account

Control valves

Control valves are mechanically or electronically actuated valves with several switch positions. Depending on the specified position of the spool along the control edges, a volume flow is set for operating the connected working equipment. The individual pressure compensator adjusts a constant load pressure drop via the supply control edge of the spool, so that a load pressure-independent volume flow control is achieved across the whole adjusting range, also in parallel operation (load compensation). The system must be leakage-free, to prevent accidental dropping of the load, even with parallel operation.

Bore machining

Soluciones de aplicación

1 – Series pequeñas y medianas con herramientas fijas

Situación inicial del cliente

MAPAL Application solution 1

Carcasa de la válvula EN-GJS-400-15 – Perforación

  • Pedidos individuales, pequeñas y medianas cantidades
  • No es posible ajustar la herramienta
  • Requiere poco tiempo de entrega
  • Altas tarifas por hora de las máquinas
  • Proceso estable de expansión y deshuesado disponible
  • Concepto de herramienta adaptado a diversas variantes de componentes

2 – Producción a gran escala con herramientas fijas y ajustables

Situación inicial del cliente

MAPAL Application solution 2

Carcasa de la válvula EN-GJS-400-15 – Perforación de corredera y de equilibrio de presión

  • Producción a gran escala
  • Ajuste de la herramienta deseada
  • Altas tarifas por hora de las máquinas
  • Costos elevados para el bruñido posterior de las espinas

3 – Tamaños de lotes reducidos: reducción en los cambios de herramientas gracias a las herramientas combinadas

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 – Gestión de herramientas

Situación inicial del cliente

MAPAL Toolmanagement

Carcasa de la válvula EN-GJS-400-15 – Mecanizado completo

  • Niveles de existencias elevados
  • Los flujos de procesos en la sala de configuración no son óptimos y la calidad de los datos es incompleta
  • Transparencia insuficiente de los costos
  • Alta fluctuación debido a la escasez general de trabajadores cualificados
  • Problemas de ruptura de herramientas
  • Costos elevados de las herramientas

Soluciones de mecanizado

Pilotaje y taladrado
  • Pilotieren

    Herramienta de barrenado de metal duro

    • Seis biseles guía para una circularidad y rectitud perfectas
    • Flujo óptimo de virutas y mayores posibilidades de reafilado gracias a la tecnología de biselado múltiple y a una conducción de refrigerante adecuada

  • Boring

    Herramienta de barrenado de metal duro

    • Tres insertos, seis biseles guía y una geometría de corte especial
    • Taladro recto, flujo de virutas ideal y guía en toda la longitud del taladro

  • Boring

    Herramienta de barrenado de metal duro

    • Seis biseles guía y una geometría de corte especial
    • Taladro recto, flujo de virutas ideal y guía en toda la longitud del taladro
    • Reducción de los tiempos no productivos mediante dos operaciones de mecanizado en una sola herramienta

  • Piloting and boring

    Herramienta de barrenado de varios niveles

    • Insertos de corte intercambiables radiales y tangenciales
    • Premecanizado de la perforación y acabado de los contornos en una sola toma

  • MAPAL Boring

    Herramienta de barrenado de doble filo

    • Insertos de forma
    • Mecanizado seguro del contorno
    • Manejo fácil con bajos costos de corte

Mecanizado de bordes de control
  • 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