• Excavator

油圧バルブハウジング

すべてはメイン穴の加工品質に依存します。流体技術部品の加工において、バルブケースの製造は、最も高い精度が要求される分野です。ここでは長年にわたってマパールのスプール穴加工に関する技術ノウハウが必要とされてきました。スプールとスプール穴のギャップは、加工穴の精度に左右され、作動油は一定の方向にしか流れないようになっています。 最近の油圧バルブ穴は、加工公差の幅が非常に狭くなっています。そのため、加工穴の真円度、真直度、円筒度、仕上げ面精度はきわめて重要になっています。 
Valve block

機械加工条件

  • 鋳鉄の取り代の変動状況
  • 大きく中断する切削
  • ボーリング時のリング形成の防止、ハウジングからの確実な切り屑搬出
  • ボーリングプロセスでのコントロールエッジの破損の防止
  • 形状と位置公差に対する非常に高い要求
  • ホーニング前の一定の取り代
  • 製造部品のばらつきや限られたツール収納スペースを考慮した機械加工コンセプト

方向切換弁
方向切換弁は、機械的または電子的に作動する弁で、複数の切換位置を持ちます。あらかじめ設定されたスプールの位置に応じて、接続機器を操作するための流量が設定されます。個別圧力補償器（IDW）は、コントロールスプールの供給コントロールエッジで一定の負荷圧力勾配を調整するため、並列運転（負荷補償）でも、全設定範囲で負荷圧力に依存しない体積流量制御が実現されます。並列運転でも負荷が意図せずに低下するのを防ぐために、漏れのないものでなければなりません。

Perçages et alésages

Solutions d'application

1 – Petites et moyennes séries avec outils fixes

Situation initiale du client

MAPAL Application solution 1

Corps de valve EN-GJS-400-15 – Alésage de tiroir

  • Commandes individuelles, petites et moyennes quantités
  • Pas de possibilité de régler l’outil
  • Temps de passage moindre requis
  • Taux horaire élevé des machines
  • Processus de pierrage d’expansion stable disponible
  • Concept d'outil adapté à plusieurs variantes de composants

Détails
2 – Grande série avec outils fixes et ajustables

Situation initiale du client

MAPAL Application solution 2

Corps de valve EN-GJS-400-15 – Alésage de tiroir et de compensation

  • Grande série
  • Réglage des outils souhaité
  • Taux horaire élevé des machines
  • Coûts élevés pour les pierrages suivants

Details
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

Details
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

Details
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

Details

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