JPS6035551Y2 - Cutting steel fiber manufacturing cutter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cutter for producing cut steel fibers.

Steel fibers are manufactured by cutting directly from a steel ingot using the cutter according to the present invention.

Adding steel fibers to concrete improves the strength of concrete.

Conventional concrete is brittle because it is a brittle material, but by incorporating steel fibers, it can be made to have sticky properties similar to those of metal.

Conventional steel fibers are generally manufactured by cutting cold-rolled thin steel sheets into thin fibers.

This method had the disadvantage that many steps were required to produce cold-rolled steel sheets, and the raw materials were expensive.

However, when using the cutting method, the raw material that is similar to crude steel is used with fewer steps, resulting in extremely low raw material costs, which is an important issue as a condition for manufacturing steel fibers.

Furthermore, an important part of the running cost for manufacturing is largely determined by the structure of the cutter, which is a cutting tool.

Furthermore, the cost of the chip polishing method is also important.

The cutter of the present invention is particularly advantageous when using cemented carbide for the tip.

Tips can be used again by regrinding after being worn out by cutting, so how to increase the amount of regrinding of tips is an important issue that can reduce costs.

When cutting a steel ingot, the amount of cutting in one polishing of the chip is proportional to the number of machinable surfaces, depending on how many parts of the chip there are that can be cut.

There are two types of cutting conditions: axial and radial insert rakes.If you use an axial rake, the cutting resistance will be smoother.

With a radial rake, the strength of the insert differs depending on whether the positive is negative, and when a rectangular parallelepiped insert is used, when the radial rake is positive, the cutting edge angle of the insert will be more negative than 90° only in the relief part, but if the tip is negative Then, even if the cutting edge angle is 90', a relief angle can be provided.

Experiments have shown that there is virtually no effect even when cutting with a straight cutting edge line of the insert, making it possible to cut with a rectangular parallelepiped insert.

Next, as a method to increase the usage amount of one tip, arrange tips with a fixed difference in height in the radial direction at equal intervals on the circumference of a desk-type cutter body, and install the tallest tip first. Then, if you insert the re-ground chips and attach them one after another, you can polish the same number of chips as there are attachment points.

If this method is used, the outer diameter of the cutter is not affected by the reduction due to chip polishing, so the same outer diameter is always maintained.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 4 show a plane cutter according to the present invention, in which a cutter body 1 and grooves 3 formed at equal intervals on the circumference of the cutter body 1 are formed such that the depth of adjacent grooves is a certain difference. The chips installed in this groove have a height equivalent to the depth of the groove.

The chip 2-1.2-2 is inserted into the groove 3-1.3-2 and fixed with the mounting screw 4.

The front grooves 3-1 and 3-2 have a negative radial rake and are inclined at a required angle, so that the length of the tip and the length of the groove are the same, and the length of the tip is made of steel. equal to the length of the fiber.

The radial rake is 0~30' negative, and the axial rake is 0~30°.

The positions of the first groove 3-1 and the adjacent groove 3-2 are formed at equal intervals, and the depth of the first groove 3-1 is set to the depth of the other grooves one after another with a constant difference from the adjacent groove 3-2. It is set so that it becomes shallower the closer you go to the groove.

The first groove and the last groove installed at equal intervals on the circumference with a certain depth difference are adjacent to each other, and the difference in groove depth is in the relationship of (fixed difference value x number of grooves - 1). .

The rectangular parallelepiped chip has 21, 22, 23, 24 ridge lines that form cutting edges, and one chip has four cutting edges.

Polishing due to abrasion occurs on surfaces 21-22, 2 facing 23-24.
The surface is simply polished to a flat surface.

When the tip is attached to the cutter body and worn out after cutting, it is removed and reattached with the cutting edge of the unused ridge line exposed to the cutting side.

After performing this operation four times with one chip, only the chip is subjected to intensive plane polishing, and the chip at the position where it was inserted at the time of removal is attached to the shallow side of the adjacent groove.

The first groove is empty and then a new tip is supplied.The last groove is always filled with a final polished tip, so when the tip is replaced, this tip is scrapped.

The maximum number of times of polishing can be equal to the number of grooves installed on the circumference of the cutter body minus 1.

Furthermore, with this invention, the chip can be easily removed, and the mounting conditions between the body and the chip are kept constant regardless of the reduction in chips due to re-polishing, so the chip can be kept under constant conditions at all times. Another major feature is that because it is a radial rake negative, no crater wear occurs on the rake face of the rectangular parallelepiped insert, which enables more stable heavy cutting.

By stacking disc-shaped cutter bodies, it is possible to cut a wide width.

The present invention is a very effective method for stably increasing the amount of cutting that can be done with carbide tips, has a structure that allows easy handling, and has the effect of lowering the manufacturing cost of steel fibers by cutting.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the cutter of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a plan view of the cutter, and FIG. 4 is a perspective view of the tip. 1... Cutter body, 2... Chip, 3
...Groove, 4...Mounting screw.

Claims (1)

[Scope of utility model registration request] Multiple rectangular parallelepiped tips are installed on the circumference of the disc-shaped cutter body, including an axial rake and a negative radial rake. Adjacent tips have a certain size difference in the radial direction, allowing them to be attached and removed at equal intervals. A cutter for producing cutting steel fibers, which is characterized by being attached.