CN108655500A - A kind of processing cast iron skewed slot reamer - Google Patents

Abstract

The present invention relates to a kind of reamer, reamer body is alloy tool steel or hard alloy, and blade is hard alloy or cubic boron nitride.Reamer cutting tip is equipped with 4 to 8 cutters tooth, is corresponding with 4 to 8 oblique chip spaces, and inclination angle is 2 ° to 10 °.Cutter tooth uses two kinds of point of a knife structure blades, is unequally distributed blades on end face.Respectively there are one interior cooling holes for each cutter tooth and chip space of reamer.Compared with prior art, the present invention uses oblique chip space, and compared to straight trough, tool inclination angle increases 2 ° to 10 ° from 0 °, and cutting edge gradually cuts out workpiece, and cutting process is steady, improves the processing quality in hole；Using the blade of two kinds of different point of a knife structures so that not only improved blade stress condition in process but also there is the ironing process to machined surface, and be conducive to the surface quality for improving machined surface.Interior cooling hole has taken into account cooling and chip removal function, reduces the surface roughness value in processing hole, and does not influence processing efficiency.

Description

A kind of oblique groove reamer for processing cast iron

technical field

The invention relates to a tool in machining, in particular to a reamer.

Background technique

A reamer has one or more teeth and is a rotating tool used to remove a thin layer of metal from the machined surface of a hole. The reamer is used to ream the hole that has been drilled (or reamed) on the workpiece, mainly to improve the machining accuracy of the hole and reduce the roughness of its surface. It is a tool for finishing and semi-finishing the hole. , The machining allowance is generally very small.

At present, as the pace of mechanization is getting faster and faster, the precision requirements for holes in machining are getting higher and higher, and the application of reamers is also increasing. Most of the reamers currently used are straight groove reamers, because of their convenient manufacturing, inspection and sharpening, good straightness, and relatively high utilization rate, but the processing conditions are general, and chips tend to flow to the processed surface during processing. , Scratch the processed surface, reducing the surface accuracy of the hole.

Contents of the invention

The object of the present invention is to provide a reamer for high-precision hole machining.

Technical scheme of the present invention is as follows:

A multi-blade chute reamer, comprising a handle and a cutting part, one end of the handle is integrally connected to the cutting part, the diameter of the handle is smaller than that of the cutting part, and the cutting part is provided with 4 to 8 cutting edges , The cutting part is also provided with an oblique flute corresponding to the cutting edge, and the inclination angle of the flute is 2° to 10°.

The knife body is made of alloy tool steel or hard alloy; the knife body is welded to the blade, and the blade material is hard alloy or cubic boron nitride. Since the blade is made of cemented carbide or cubic boron nitride, the heat resistance and wear resistance of these two materials are relatively strong, thus ensuring the heat resistance and wear resistance of the blade.

The tip of the blade of the reamer adopts two different tip structures of arc type (Type A) and broken line type (Type B), and the two types of tip are distributed intersectingly, wherein the cutting edge of the sharp edge is relatively sharp, and the stress It is better, suitable for finishing and superfinishing, and the arc-shaped tip has a certain pressing effect on the processed surface during the cutting process, and at the same time meets the process conditions, which is conducive to improving the surface quality of the processed surface.

The teeth of the reamer are distributed with unequal tooth pitches on the circumference of the end face, which avoids the periodic vibration of the tool due to the presence of hard spots in the material to be processed or the chips stuck on the hole wall, resulting in the cutting of the teeth. Dents deepen directional repetition. In order to facilitate manufacturing and measurement, the cutter teeth are distributed with unequal pitches with equal angles between the top teeth.

The reamer has internal cooling holes, and each cutter tooth and chip flute has an internal cooling hole. around the groove,. The cooling and lubrication method of internal cooling can significantly improve the cooling and chip removal effect, so that the surface roughness of the hole is greatly reduced without affecting the processing efficiency.

The beneficial effects of the present invention are: since the flute is an inclined groove, and the insert is welded on the cutter body, compared with the straight groove, the inclination angle of the insert edge increases from 0° to 2° to 10°, so that the cutting edge gradually Cutting in and out of the workpiece, so the cutting force is reduced and relatively uniform, the cutting process is stable, and the processing quality of the hole is improved, which is very beneficial for finishing. At the same time, the cross distribution of two different blade structures is adopted, which is beneficial to reduce the surface roughness of the hole. The internal cooling oil hole takes into account the functions of cooling and chip removal, which can reduce the surface roughness of the hole without affecting the processing efficiency. Since several cutting edges are distributed on the side surface of the cutting end of the cutter head, after reaming, the hole has high precision and high inner smoothness.

Description of drawings

Through the detailed description of the accompanying drawings, the advantages, objects and features of the present invention described above will become clearer. in:

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is the left view structural representation of the present invention;

Fig. 3 is a schematic diagram of the distribution of reamer teeth on the circumference of the end face;

Fig. 4 is a schematic diagram of the blade structure of a type A reamer tooth;

Fig. 5 is a schematic diagram of the blade structure of a B-type reamer tooth.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

A chute reamer for machining cast iron, its structure is shown in Figure 1-2, the diameter of the shank 1 of the reamer is smaller than the diameter of the cutting part, and the cutting part is provided with six cutting edges 4 and six corresponding chip removal Groove 3, where the inclination angle of the flute is 4°. The blade and the cutter body are welded, the blade material is hard alloy, and the cutter body material is tool steel. The blade adopts two different blade structures, the sharp edge and the blunt round edge, which are arranged crosswise. The distribution method is shown in Figure 3. The blades are distributed with unequal tooth pitch on the circumference of the end face, and the distribution angles are: 55°, 60°, 65°, 55°, 60°, 65°. The diameter of the reamer can be 10-50mm, which is used for different cutting occasions. In this embodiment, the diameter of the reamer is 40.038mm, and the total length of the whole reamer is 125mm.

The invention utilizes the oblique flute, and compared with the straight flute reamer, the inclination angle of the tool edge increases from 0° to 4°, and the cutting edge gradually cuts in and out of the workpiece, so the cutting force is uniform, the cutting process is stable, and the machining of the hole is improved The quality is very beneficial to finishing; two different blade structures, blunt round blade and sharp blade, are used to distribute crosswise. The blade structures are shown in Figure 4 and Figure 5 respectively, which can be effectively used in the finishing process Improve the surface quality of the machined surface; the reamer teeth are distributed with unequal pitches on the circumference of the end face, which can effectively avoid the hard points of the machined material or the sticking on the hole wall during the machining process. Periodic vibration generated by cutting chips; each tooth and chip flute has an internal cooling hole 2, which takes into account the functions of cooling and chip removal, so the surface roughness value can be greatly reduced without affecting the machining efficiency.

Claims (6)

1. the rear end of a kind of processing cast iron skewed slot reamer, reamer is retained part, which is characterized in that the front end of the reamer is to cut Part is cut, cutting tip is equipped with 4 to 8 cutters tooth, and there are cutter tooth two different edging structures, flank to be equipped with chip space, The chip space is skewed slot, and reamer carries interior cooling hole.

2. a kind of processing cast iron skewed slot reamer according to claim 1, which is characterized in that the cutter hub uses tool Steel or hard alloy make to obtain；The blade is welded with cutter hub, and blade material is hard alloy or cubic boron nitride.

3. a kind of processing cast iron skewed slot reamer according to claim 1, which is characterized in that the chip space is oblique Slot, angle of inclination are 2 ° to 10 °.

4. a kind of processing cast iron skewed slot reamer according to claim 1, which is characterized in that the cutter tooth blade is using folding The mode of line style point of a knife and the different point of a knife structure cross arrangements of two kinds of circular arc type point of a knife.

5. a kind of processing cast iron skewed slot reamer according to claim 1, which is characterized in that its cutter tooth is on the circumference of end face By the way of unequal blade spacing distribution.

6. a kind of processing cast iron skewed slot reamer according to claim 1, which is characterized in that the interior cooling hole is every There are one a cutting edge and chip space are all provided with.