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Halterung für Bohrmaschine
The obvious feature of the drilling machine fixture is that it is equipped with a drill sleeve to guide the drill bit. The drill sleeve is installed on the drilling template. The drilling machine fixture is usually called a “drilling template”.
Haupttypen von Bohrschablonen und ihre strukturellen Merkmale
Depending on the distribution of the holes to be processed on the workpiece and the production type of the workpiece, the drilling jig has various structural forms such as fixed, rotary, flip, swing and sliding column types.
- Fixed drilling jig
- Rotary drilling jig
- Flip drilling template
- Sliding column drilling jig
- Cover plate type drilling jig (removable drilling template type drilling jig)
Eckpunkte der Konstruktion von Bohrmaschinenvorrichtungen
Bohrerhülse
The function of a drill sleeve is to position the axis of tools such as drill bits and reamers, preventing them from deflecting during machining. Drill sleeves can be categorized into various types, including fixed, replaceable, and quick-change, depending on their intended use.
(1) Fixed drill sleeve
(2) Interchangeable drill sleeve
(3) Quick-change drill sleeve
(4) Special drill sleeve
Schablone bohren
Common drilling templates include four structural types: fixed, hinged, detachable, and hanging.
(1) Fixed drilling template
(2) Hinged drilling template
(3) Suspended drilling template
Determination of drill sleeve position dimensions and tolerances
The position of the drill sleeve on the fixture is marked based on the positioning surface or axis of the positioning element. The drill sleeve position dimension is based on the average dimension of the corresponding workpiece dimension, with a tolerance of 1/2 to 1/5 of the corresponding workpiece dimension tolerance. Deviations are marked symmetrically.
Halterung für Fräsmaschine
Milling is an intermittent cutting operation prone to vibration. Therefore, the load-bearing components of the milling machine fixture must have sufficient strength and rigidity, and the clamping mechanism must provide sufficient clamping force and good self-locking performance.
The tool setting block and locating key are unique components of the milling machine fixture. The tool setting block is used to determine the position of the milling cutter relative to the fixture’s locating elements; the locating key is used to determine the position of the fixture relative to the machine tool.
1.Werkzeug-Einstellgerät
The position of the tool block working surface on the fixture is marked based on the positioning surface or axis of the positioning element. Its position dimension can be calculated based on the process dimension and feeler gauge size. Its tolerance is generally taken as 1/5 to 1/2 of the corresponding process dimension tolerance, and the deviation is marked symmetrically.
2. die Positionierungstaste
The correct position of the milling machine fixture relative to the machine tool is determined by the two locating keys installed in the longitudinal grooves on the bottom surface of the fixture body, which cooperate with the T-slots on the machine table. Common locating keys have a rectangular cross-section. To minimize positioning errors, the installation distance between the two locating keys should be as large as possible.
Vorrichtung für die Drehmaschine
Lathe fixtures are generally used to machine rotating parts. During turning, the lathe spindle drives the workpiece through the fixture to rotate. When designing such fixtures, attention must be paid to addressing the mass balance and operational safety issues caused by the fixture’s rotation.
Kombinierte Halterung
A modular fixture is a fixture assembled from a set of pre-manufactured standard components and assemblies. After completing the specified processing task with the modular fixture, it can be easily disassembled. The used components and assemblies are cleaned and stored in the warehouse for use when the fixture is assembled next time.
The modular fixture is the most standardized, serialized, and universal fixture among machine tool fixtures. Its basic characteristics are: flexible and changeable structure, long-term reuse of components, and short design and assembly cycle.
The disadvantages of the modular fixture are: large size, poor rigidity, and large one-time investment in purchasing components and assemblies.
The modular fixture is suitable for processing workpieces with high positional accuracy requirements in single-piece small-batch production, and is often used in the trial production of new products and to complete temporary surprise tasks.
Tragbare Halterung
A portable fixture is a mobile fixture used on automated production lines. Besides positioning and clamping the workpiece, it also transports the workpiece along the production line’s process flow to the fixtures of each machine tool, where it is positioned and clamped.
