Outline and key points of jig, fixture and gauge design
Designing purposes:
Jig, fixture and gauge are designed to improve the machining accuracy, production efficiency and operations’ safety.
Design considerations:
The general service time of jig, fixture and checking gauge is long. Mold type tooling mainly considers points are the service life, maintenance conditions, etc. Fixture type tooling mainly consider easy to use, safe, efficient and reliable. Checking fixtures mainly consider convenient use, reliable, convenient maintenance and so on. Therefore, safety, high efficiency, reliability, life, easy to use and other factors for the design of fixture should be placed as primary consideration, cost followed.
Material selection criteria:
When designing, try to use standard parts (such as guide pillar, guide sleeve, fastener, spring, hardware, cylinder, hydraulic cylinder, standard die frame, fast clip and so on).
The design of the main parts should carefully design the metal materials and the type of heat treatment (such as: quenching, high frequency, carburizing quenching, nitriding quenching) match and hardness selection, especially to take into account the influence of heat treatment parts deformation and treatment, friction parts to consider the hardness match and necessary lubrication measures.
Surface treatment should be carefully designed according to the function of the parts of the thickness and type of coating (galvanized, nickel, bright chromium, anodized, hard anodized, conductive anodized, hard chromium, blue, etc.).
The basic points of the design of tooling, fixture and checking fixture:
1.The clamping mode of mechanical parts:
A directly find the front clamping: low efficiency, high alignment accuracy; Applicable to single piece, small batch and simple shape of the work-piece. For example, the four jaw chuck on the machine tool, which itself is a kind of fixture, is just a general fixture.
B line to find the mounting clip: good versatility, but low efficiency, low precision; It is suitable for single small batch castings with complex shape.
2.Three principles of clamping after the parts are positioned in the fixture:
A. The principle of not moving parts after they are positioned in the fixture
Select the direction of the clamping force pointing to the positioning benchmark (the first benchmark), and the size of the clamping force should be enough to balance the influence of other forces, do not make the parts in the process of moving
B.Principle of non-deformation after the parts are positioned in the tooling and fixture
Under the action of clamping force, do not make the parts in the processing process of the accuracy of the deformation is not allowed, must choose the appropriate clamping part, adjust the contact state of the plate and parts, with the appropriate compression force.
C.The principle of non-vibration after the parts are positioned in the tooling and fixture
To ensure the rigidity of the supporting and clamping system, the clamping part should be as close as possible to the processing area of the parts to avoid the vibration of the parts and clamping system.
Generally speaking, to the fixture with rough processing, choose larger clamping force, mainly consider the parts do not move principle, to the fixture with fine processing, choose smaller clamping force, mainly consider the parts do not deform and do not vibrate principle.
At Accu, we have one rich experienced engineering and manufacturing team providing high quality jig, fixture and tooling and other prototyping solution. If you have queries on technical or product needs, you’re greatly welcome to contact with our product manager Flemming at This email address is being protected from spambots. You need JavaScript enabled to view it.. Thank you!
