German kohn spannwerkzeuge workpiece fixtures kohn spannwerkzeuge models kohn spannwerkzeuge prices

kohn spannwerkzeuge workpiece fixtures are devices used on machine tools to clamp workpieces and guide cutting tools. They refer to fixtures specifically designed for a particular operation on a specific workpiece. Their characteristics include compact structure, rapid, convenient, and labor-saving operation, ensuring high machining accuracy and production efficiency. However, the design and manufacturing cycle is long, and manufacturing costs are high. When the product changes, the fixture becomes obsolete and is scrapped due to inability to reuse. It is only suitable for production with fixed products and large batch sizes. It contacts the positioning datum of the workpiece to determine the correct position of the workpiece in the fixture, thereby ensuring the correct relative position of the workpiece with respect to the cutting tool and the machine tool's machining motion during processing. It typically consists of positioning elements, clamping devices, tool-setting and guiding elements or devices, etc.

kohn spannwerkzeuge Workpiece Fixture Classification

1) Lathe fixtures: Fixtures used on lathes to machine internal and external rotary surfaces and end faces of workpieces are called lathe fixtures. Most lathe fixtures are mounted on the spindle, while a minority are mounted on the saddle or bed. 2) CMM fixtures: Used on coordinate measuring machines, utilizing modular support and reference devices to achieve flexible fixation of the measured workpiece. This device allows automatic programming to support the workpiece and establish unlimited workpiece configuration reference points. Advanced specialized software can directly generate the workpiece clamping program within seconds using the workpiece's geometric data. 3) Industrial robot grippers: Mounted on industrial robots for use in industrial automation equipment, representing one of the new technologies in modern industrial automation. They mainly appear in modern industrial production in coordination with robots, with common applications including machine tool loading/unloading, workpiece palletizing/depalletizing, welding, grinding, and other automated unmanned factory processes. 4) Milling machine fixtures: Mounted on the milling machine table, moving with the table during feed motion. They mainly consist of positioning devices, clamping devices, fixture bodies, connecting elements, and tool-setting elements. During milling, cutting forces are large and cutting is intermittent, resulting in significant vibration. Therefore, milling machine fixtures require high clamping force, and high stiffness and strength. 5) Bearing housing fixtures: To ensure and improve the production quality of bearing housings, in addition to machine tools and other mechanical equipment, a large amount of process equipment is used, including bearing housing fixtures, molds, cutting tools, and related auxiliary tools. Bearing housing fixtures are specialized production tools designed to ensure the product quality of bearing housings, making the production process more convenient. Different bearing housing fixtures vary in structure, form, operating conditions, and design principles, resulting in a wide variety of types and styles, accounting for a significant proportion in both quantity and variety. These fixtures can accurately determine the relative position between the workpiece and the cutting tool, i.e., they can clamp the workpiece to be machined, thereby enabling the necessary motions during the machining process. Since bearing housing fixtures play a very important role in the bearing housing production process, the drafting of their design drawings is also crucial.

kohn spannwerkzeuge Workpiece Fixture Features

1) Suction force of the suction cup: The electrically controlled powerful suction cup has extremely strong holding force, with a maximum of 16kg/cm². The magnetic force is evenly distributed and adjustable, making it suitable for various types of heavy machining, rough machining, and precision machining. Ordinary powerful suction cups have weaker and unevenly distributed suction force, which cannot meet the requirements of heavy machining operations. 2) Machining accuracy: The holding force of the electrically controlled powerful suction cup does not require continuous power supply to maintain. It generates no heat during continuous operation, avoiding thermal deformation of the workpiece. At the same time, its strong and uniform surface suction ensures the highest machining accuracy even if the workpiece extends beyond the table. In contrast, ordinary electromagnetic suction cups require a constant current supply, generating heat after prolonged use. This not only causes thermal deformation of the workpiece but also reduces the magnetic force of the suction cup, failing to guarantee machining accuracy. 3) Performance: The electrically controlled powerful suction cup can be used continuously without any faults or maintenance, even when operating for more than 20 hours per day. Ordinary permanent magnet suction cups experience a decline in suction force after about half a year of use, while electromagnetic suction cups can only operate for a few hours each day. Additionally, their internal components are prone to failure, requiring frequent replacement and repair. 4) Operational efficiency: When using ordinary powerful suction cups, significant time is spent adjusting the workpiece, accounting for 40%-50% of the entire machining process. Moreover, clamping and positioning often result in noticeable errors, leading to high scrap rates and very low efficiency. The electrically controlled powerful suction cup features automatic auxiliary positioning. Simply pressing a button completes the clamping or release of the workpiece within 0.3 seconds, greatly improving production efficiency.

kohn spannwerkzeuge Workpiece Fixture Maintenance

When using vacuum suction cups (without grippers), note that the manipulator's movement speed should not be too high; otherwise, shear forces will act on the suction cups, causing the product to easily drop during rapid twisting. In some cases, a gripper can be used to ensure safe transport of the product. Considering the possibility of the product sticking to the mold, an air gripper is usually installed to solve this problem. If the product's surface area is too small or the product is too heavy for vacuum suction cups, this issue can also be resolved by using grippers. If strict appearance requirements apply to the product, the clamped area must not be the outer surface. To address this, a sensor circuit can be installed. Once the gripper or suction cup has securely grasped the product, the sensor sends a signal to the manipulator to proceed with the next step. In cases where the manipulator's motion capability is limited and manual twisting or prying is required to demold or remove the product from the forming area, a special cylinder capable of independent movement, not relying on the manipulator, can be added to improve this situation.

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