Combined fixture is divided into machine tool fixture and welding fixture.
Machine tool: In order to facilitate assembly and obtain higher assembly accuracy, the manufacturing accuracy of the modular fixture element itself is IT6 ~ 7, and it should have good interchangeability and wear resistance. Generally speaking, the assembled fixture can process the workpiece with IT8 precision, and if it is carefully adjusted, it can also process the workpiece with IT6 ~ 7 precision.
Welding is composed of many standardized, serialized and universal modules required by standardized technology. All modules are connected, fixed and pressed by locking pins for hole positioning, and the modules can be adjusted according to the actual size of the workpiece. The combination of the whole fixture system can realize the construction of two-dimensional and three-dimensional space.
Extended data
Development trend of combined fixture
1. Multifunctional modularization of fixture components: The proportion of multifunctional modular units that can be used alone or in combination with other components will further increase. For example, various modular units, such as positioning clamping seat, positioning compression bracket and precision vise, have comprehensive functions of positioning, clamping and adjustment.
One piece can be used alone or several pieces can be assembled together. T-shaped base and square box can be assembled into a fixture, which can clamp multiple identical or different workpieces at a time. The use of this fixture can reduce the downtime of machine tools and maximize the efficient performance of CNC and machining center machine tools.
2. Integration of special fixture and combined fixture: The versatility of modern processing equipment makes the processes highly concentrated, and the workpiece can be positioned and clamped once to complete multi-process processing, which requires a universal and reusable combined adjustable fixture system.
It consists of a series of unified and standardized parts and components, which are assembled into reusable fixtures with different forms and structures for single-piece or small and medium-sized batch production.
This fixture system retains all the advantages of combined fixture, and the assembly is as simple and reliable as special fixture. In order to facilitate the positioning and connection between the fixture and the machine tool, the fixture base has a unified standard positioning and connection position, which makes the special and combined fixtures develop towards integration and combination to meet the needs of modern processing equipment.
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