Automobile rubber sealing strip is one of the most important sealing strips in automobile sealing strip products, and it dominates in the evaluation of vehicle seal quality. For the performance testing of automotive rubber sealing strips, sometimes it is necessary to select the cross-sectional slice as the test sample. For example, detection of cross-section bubbles, pits, delamination cracks, coatings, etc.
Automobile rubber sealing strips are mainly composed of a card-loading part for installation and fixing and a sealing part for sealing. The main raw material is EPDM. The card loading part is mainly composed of a dense rubber matrix. The dense rubber contains a metal frame, which plays a role in strengthening the shape and fixing of the rubber strip to prevent it from being disengaged or falling off during work. The sealing part is composed of a sponge foam tube base. The sponge foam tube is soft and flexible, and has the functions of deformation under pressure and rebound under pressure relief. In addition, sometimes in order to meet the various performance requirements of the door frame sealing strip, many auxiliary materials will be added, such as steel belt, galvanized steel wire, flannel, etc.
For the cutting of such multi-component composite structural parts, it is necessary to comprehensively consider the physical characteristics of each component and the influence of each other, and select the best cutting equipment and cutting speed.
The diamond wire cutting machine uses the diamond wire to reciprocate to realize the cutting function. The worktable performs cutting feed with 0.01mm step accuracy, ensuring the stability of the cutting process and the flatness of the cutting surface. Diamond wire cutting machine is suitable for precision cutting of many types of materials, such as glass, crystal, ceramics, rock samples, metals, plastics, PCB, refractory materials, etc. Therefore, the diamond wire cutting machine is used to cut the thin slices of the sealing strip of the automobile door frame. As shown in the figure below, it is a thin slice of automobile door frame sealing strip cut by STX series diamond wire cutting machine. The left part is the compact rubber matrix to form the card loading part, which contains the alloy metal frame; the right part is the sealing part formed by the sponge bubble tube matrix.
It can be seen from the figure that the overall structure of the sealing strip is complete, and the cutting end surfaces of each component are intact, maintaining its original material form; the binding boundary of each component is clearly discernible, without dragging, sticking, and can be completely Meet the requirements as a test sample. At the same time, it shows that the diamond wire cutting machine can perform good cutting treatment on this kind of multi-component composite structure material.
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