News information
Tool holder crack
07-16
Also known as healing crack. Such cracks in the extrusion molding is often not found, the more serious in the drying began to appear, and most of them are exposed after sintering, what is more, built on the wall for a few years to show more serious harm. The author is inIn 1968, a large elliptical hole in the middle was produced, and the original shape of "hollow bricks" with two round holes on both sides with an overall size of 240 × 115 × 110mm were built on the outer slope wall of a one-time yard firing tunnel kiln. The kiln was put into production on July 1, 1970. By 1986, the bricks on the outer slope wall were all tool holder cracks.
In fact, this problem in extrusion molding a little attention can be found in time. The method is to take the thin billet at both ends of the mud strip just cut by the billet cutting machine and break it from the center line of the billet by hand. If the fracture surface is a straight line and the fracture surface is relatively smooth, it is the crack of the tool holder.
The reason for this situation is that when the mud material was squeezed into the machine head, it was originally a whole mud rod (mud column) that was divided into two parts by the large blade placed horizontally in the machine head. After crossing the large blade, it was recombined in the core rod area and walked out of the machine mouth. The recombined distance is the effective length of the core rod, that is, the distance from the mud bar to the large blade and walked out of the machine mouth, but the length.200mm, the time is only a few tenths of a second, the "wound" cut out by the mud strip has not yet healed, and "nobody cares".
The healing distance and healing time of the mud strip in the head and mouth of the machine are only so long, so we can only make the wound as short as possible, smaller and shallower as possible to recover quickly. Therefore, the only measures to solve this problem are:
Make the core rod longer and extend the healing distance as much as possible. As a medium-hard shale, the healing distance should not be less than 230mm.
Remove the part of the large blade without the core rod and the small blade at both ends to shorten the wound.
On the basis of ensuring the strength, the width of the large blade is compressed to 40~60mm to reduce the depth of the wound.
The thickness of the large blade is compressed to 8~10mm to reduce the width of the wound.
Practice has proved that the thickness of the car is8~10mm waste spring steel plate, the strength has been completely enough, small blade and four corners of the support leg, you can use thick 4~6mm, wide 30~40mm waste spring steel plate.
If the production of the small blade is poor, it will also cause the crack of the knife holder, which is due to the friction resistance generated by the mud bar of the small blade is too large.The "wound" is serious and cannot be healed. If the small blade is welded with a core rod and changed into a U-shaped core rod, not only does this problem not exist, but it is easier to make and the core tool has less resistance to mud flow.
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