CN87200168U - Upward-pressing and non-regrinding end mill with replaceable series bit - Google Patents

Abstract

The utility model discloses an upward-pressing and throw-away end mill with replaceable series bit, comprising a shank and a cutter head. The cutter head is replaceable, and the front end of the cutter head is provided with a plurality of throw-away blades without centre holes. Each blade adopts a mushroom-shaped screw (or a screw and a small pressing plate) to press tightly. The unregrinding blades without centre holes can be made much smaller, and the blade compaction device is simple. Because the blades and the compaction device occupy smaller space, the diameter and the length of the cutter head can be made much smaller. The structure of this end mill is suitable to make the end mill with replaceable series bit with larger diameter and is also suitable to make the end mill with replaceable series bit with smaller diameter. In the figure, 1 is the shank, 2 is the cutter head, 3 is the mushroom-shaped screw, and 4 is the blade.

Description

Upward-pressing and non-regrinding end mill with replaceable series bit

The invention belongs to a kind of metal cutting tool.

Known technology 1 is a Chinese patent 85205790, but this is a kind of slotting cutter of throw away change series of bits, handle of a knife is public, cutter head can load and unload replacement, the throw away chip of dress band centre bore on the cutter head, the advantage of this slotting cutter is can be by the needs of processing tasks, change cutter head easily, and the connection of cutter head and handle of a knife is to occur on the cutter head, rather than on the extension body cutter neck of cutter head, owing to the minimizing of cutter head length, strengthened the rigidity and the cost that has reduced cutter of cutter, the blade of this cutter adopts central screw to compress mode, compresses reliable.But this slotting cutter also has its limitation, that is, since blade is the band centre bore, consider the intensity of blade itself, this blade just can not be done very for a short time, the height of its triangular blade, difficult less than 12.5 millimeters, thus the diameter of interchangeable cutter head is difficult for less than 25 millimeters.

But purpose of the present invention at first is exactly for designing a kind of slotting cutter of small-sized throw away change series of bits, as replenishing of above-mentioned known technology.

Known technology 2 is existing a kind of pressure type throw away monoblock type slotting cutters of going up of selling on the market, this slotting cutter adopt small dimension not with the throw away chip of centre bore, compress blade with a mushroom-shaped screw, make this slotting cutter can do lessly, be suitable for the processing of small size workpiece.Its weak point is that it is a whole cutter, therefore the workpiece of working as different size adds man-hour, must change the monoblock type slotting cutter of the size that varies in size, rather than only changed a cutter head just, and in addition, work in-process, the most flimsy position of slotting cutter is at cutter head, after cutter head damages, will make and whole slotting cutter be scrapped, this has just increased the plant produced expense.

Can this slotting cutter be improved the slotting cutter that becomes interchangeable series of bits?

Above-mentioned two kinds of known technologies respectively have pluses and minuses.Known technology 1, but be to adopt change series of bits, can reduce the tool magazine storage, its limitation is to be difficult for manufacturing the small-sized slotting cutter of diameter less than 25 millimeters interchangeable cutter head; Known technology 2, though this cutter structure can be manufactured small-sized slotting cutter, but whole cutter, the damage at cutter head position will be scrapped wholely cutter in the processing, the workpiece of processing different size need be changed the slotting cutter of different size.

The present invention can be described as respectively the improvement of these two kinds of cutters, and the advantage that can be described as again these two kinds of cutters complements each other and combination, designs a kind of novel slotting cutter.

The present invention adopts blade type and the last pressure type in the known technology 2 to compress mode, is that each blade is throw away chip not with holes (4 among the figure), every blade is with a mushroom-shaped screw (3 among the figure) (also can adopt a screw to add a small-sized pressing plate), when tightening the mushroom-shaped screw when tightening screw on the small-sized pressing plate (or), the bottom surface of the first end of mushroom-shaped screw (or bottom surface of little pressing plate one end) just is pressed on the end face of blade from top to bottom, and blade is fastening.(or in the occupied cutter head space of blade and little pressing plate) critical surface (the A face among the figure) that different with known technology 2 is in the occupied cutter head space of blade and mushroom-shaped screw is opened lowlyer.Reduce the height of critical surface (A face), not only can reduce the labor content in the cutter manufacturing, can increase the space of cutter head afterbody again, thereby might directly on cutter head, manufacture the hookup that connects handle of a knife, the length of interchangeable cutter head (among the figure 2) is increased, to keep the original rigidity of cutter.

The way that the present invention adopts cutter head in the known technology 1 and handle of a knife to separate, be by spiral marking connection between cutter head and the knife bar, on at the bottom of the cutter head tail, have internal thread, have corresponding external screw thread at the handle of a knife front end, also have a pair of wrench is puted forth effort during for tool changing breach, cutter head at the cutter head afterbody and can load and unload replacement.

The cutter head of this milling cutter can be made into the series specification (it both had been fit to the slotting cutter of minor diameter specification, also was fit to the slotting cutter of major diameter specification) of different-diameter, and handle of a knife also can be made into corresponding several standard specification.

In the accompanying drawing, the 1-handle of a knife; The 2-cutter head; 3-mushroom-shaped screw; The 4-blade.

Claims (3)

1. But 1, a kind of slotting cutter of going up pressure type throw away change series of bits, the cutter head machinery that can load and unload that throw away chip is housed by handle of a knife and front end is assembled, cutter head is on the cutter head rather than on the cutter neck to the connection position of handle of a knife, and characteristics of the present invention are that its each piece throw away chip of interchangeable cutter head front end all is not to be with centre bore.
2. But 2, the described a kind of slotting cutter of going up pressure type throw away change series of bits of claim 1, described blade is to adopt to go up the pressure type hold down gag, and it is pressed in the cutter groove.
3. But 3, the described a kind of slotting cutter of going up pressure type throw away change series of bits of claim 2, the said pressure type hold down gag of going up is to adopt a mushroom-shaped screw (or a screw adds a little pressing plate), when tightening screw, blade just is pressed in the cutter groove.

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