CN204338903U - Arcuate blade cutoff tool - Google Patents

Abstract

The utility model discloses an arc-shaped cutting knife. The arc-shaped cutting knife comprises a knife handle and a knife head. The cutting edge is located in front of the knife head. The cutting edge is an arc-shaped curved edge. The cutting knife involved in the utility model is left-right symmetrical as a whole, and its cutting edge adopts a left-right symmetrical arc edge, and the front face is correspondingly an arc surface. The utility model can ensure that each point belongs to oblique cutting, and has the function of chip separation, and also has the self-centering characteristic, which avoids the breakage of the cutter head, ensures the shape and position accuracy of the cut groove, and improves the tool life.

Description

Curved cutting knife

technical field

The utility model relates to the technical field of cutting tools, in particular to an arc-shaped cutting knife.

Background technique

Cutting is a processing method of cutting a bar or workpiece into two or several sections in turning. The cutting knives in the prior art can be divided into straight cutting knives and oblique cutting knives. As shown in Figure 1, the straight-edged cutting knife includes a head and a handle, and the cutting edge is located in front of the head. The cutting edge is a straight line perpendicular to the cutting direction. As shown in Figure 4, the straight-edged cutting knife is a right-angle cutting, that is, the cutting edge is perpendicular to the cutting speed direction, the cutting force is large, the cutting vibration is large, the machine tool consumes high energy, and the processed surface, that is, the quality of the cut surface is low. As shown in Figure 2, the cutting edge of the beveled cutting knife is an oblique line that is not perpendicular to the cutting direction. As shown in Figure 5, when the oblique cutting knife is cutting, it belongs to oblique cutting, that is, the cutting edge is not perpendicular to the direction of cutting speed, and the cutting force is small, but the cutter head is moved to one side under the normal force on the cutting edge Compression causes the friction between the cutter head and the cut surface on this side to intensify, reducing the surface quality of the cut surface on this side. Moreover, the cutter head of the cutting knife is generally weak, and it is easy to break under the action of this normal force. Therefore need to overcome the defective of above two kinds of cut-off knives, design a kind of new cut-off knives can guarantee oblique angle cutting again, can guarantee that cutter head can not be extruded to one side again.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to overcome the defects of the above two kinds of cutting knives, which can not only ensure that the cutting edge belongs to oblique cutting, but also ensure that the knife head will not be squeezed to one side, and at the same time improve the strength of the cutting part of the tool, and then improve tool life, thereby providing a cut-off knife with a curved edge.

(2) Technical solutions

In order to solve the above technical problems, the utility model provides an arc-shaped cutting knife, which includes a handle, a knife head and an arc-shaped cutting edge located in front of the knife head. The arc-shaped cutting edge is an arc-shaped curve Blade; the tangent line of each point on the arc curve and the base surface of the tool form a left and right blade inclination angle of 0-30°.

Preferably, the arc-shaped blade is left-right symmetrical, with a raised center as a whole, and two sides falling down. The blade inclination angles of the two symmetrical points on the arc-shaped edge are equal, and the edge inclination angle of the highest point in the middle of the arc-shaped edge is zero.

Preferably, the arc edge is a circular arc edge.

Preferably, the diameter of the arc is 80mm-1000mm.

Preferably, the tangent line of each point on the arc curve forms a left and right blade inclination angle of 0-15° with the base surface of the tool.

Preferably, the tangent line of each point on the arc curve forms a left and right blade inclination angle of 0-8° with the base surface of the tool.

The blade inclination angle is the angle between the tangent line of the selected point on the circular arc blade and the base surface of the tool. The inclination angle of each point on the arc edge is different. The inclination angle of the highest tip point is 0°, and it extends from the tip to both sides, and the inclination angle becomes larger. The edge inclination angle at the two ends of the arc is the largest. The blade inclination angle is related to the processed material and the processing environment. The stronger the processed material is, the higher the hardness is, the smaller the blade inclination angle is, and vice versa. The base surface of the tool is a plane parallel to the installation bottom surface of the tool. The diameter of the arc is related to the material to be processed and the processing environment. The higher the strength and hardness of the processed material, the larger the diameter of the curved edge is to enhance the strength of the blade.

(3) Beneficial effects

The cutting knife involved in the utility model is left-right symmetrical as a whole, and its cutting edge adopts a left-right symmetrical arc edge, and the front face is correspondingly an arc surface. The utility model can ensure that each point belongs to oblique cutting, and has the function of chip separation, and also has the self-centering characteristic, which avoids the breakage of the cutter head, ensures the shape and position accuracy of the cut groove, and improves the tool life.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a three-dimensional schematic diagram of a straight cutting knife;

Fig. 2 is a three-dimensional schematic diagram of a beveled cutting knife;

Fig. 3 is a three-dimensional schematic diagram of the utility model arc blade cutting knife;

Fig. 4 is a working schematic diagram of a 45-degree downward view of a straight cutting knife;

Fig. 5 is a schematic diagram of the operation of the oblique cutting knife in a 45-degree downward view;

Fig. 6 is a schematic diagram of the work of the utility model's circular arc cutting knife in a 45-degree overlooking direction;

Marks in the figure: 1. Knife handle, 2. Cutter head, 3. Cutting edge, 4. Knife front, 5. Cut-off knife, 6. Work piece; A, feed direction, B, speed direction.

Detailed ways

The implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

Example 1

As shown in Figure 3, the arc-shaped edge cutting knife involved in this embodiment includes a handle 1, a cutter head 2 and an arc-shaped cutting edge 3 positioned in front of the cutter head. The arc-shaped cutting edge 3 is an arc-shaped curved edge, and the The arc can be a circular arc, an elliptical arc, a parabola, a hyperbola, etc., preferably a circular arc. The arc-shaped blade is left-right symmetrical, the whole middle is convex, and the two sides fall down, and the inclination angle of the left blade is equal to the angle of the right blade inclination. The tangent of each point on the arc curve and the base surface of the tool form a left and right blade inclination angle of 0-15°.

Specifically, the cutting knife involved in the utility model adopts a left-right symmetrical circular arc blade, and the blade inclination angles of each point on the circular arc blade are different, and they are all in the tangent direction of this point. The edge inclination angles of the two points are the same. When cutting, as shown in Figure 6, each point can realize bevel cutting at the same time. The front of the tool corresponds to the arc cutting edge as an arc surface. When cutting, due to the different normal directions of the points on the front, the chips are torn and scattered after being generated, which is easy to separate and remove chips. The normal component forces of the two symmetrical points on the circular arc edge cancel each other out in the horizontal direction, the cutter head will not be broken and bent under this force, and the circular arc edges on both sides are symmetrical to each other, which has the characteristics of self-centering , this feature can ensure that the cut groove is perpendicular to the axis of the workpiece. At the same time, the strength at the tip of the arc edge is higher, and the tool life is longer. The radius of the arc edge can be adjusted according to different workpiece materials and working environment. Therefore, the utility model can ensure that each point belongs to bevel cutting, and has the function of chip separation. At the same time, it also has the characteristic of self-centering, which avoids the breakage of the cutter head, ensures the shape and position accuracy of the cut groove, and improves the tool life.

The effect of the utility model is as follows: 1. The cutting edge is a circular arc edge, which is symmetrical left and right, and the blade inclination angles of two symmetrical points on the left and right are the same, and the farther away from the symmetrical surface, the greater the inclination angle of the edge. 2. When the arc edge is cutting, each point belongs to bevel cutting. Since the normal direction of each point on the front is different, the chips are naturally torn and scattered. 3. The overall cutting knife is left-right symmetrical, and the normal component forces of the two symmetrical points in the left-right direction cancel each other out in the horizontal direction. 4. There is no protruding tool point on the arc edge, the cutting part has high strength and the tool life is high. 5. The radius of the cutting edge arc can be adjusted according to different workpiece materials and working environments.

Example 2

Compared with Embodiment 1, the only difference is that in this embodiment, the tangent line of each point on the arc curve and the base surface of the tool form a left and right blade inclination angle of 0-8°.

Example 3

Compared with Embodiment 1, the only difference is that in this embodiment, the tangent line of each point on the arc curve and the base surface of the tool form a left and right blade inclination angle of 0-5°.

The above embodiments are only used to illustrate the utility model, but not to limit the utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present utility model will not depart from the spirit and scope of the technical solutions of the present utility model. All should be included in the scope of claims of the present utility model.

Claims (6)

1. an arcuate blade cutoff tool, is characterized in that, this arcuate blade cutoff tool comprises handle of a knife, cutter head and is positioned at the arc milling sword in cutter head front, and arc milling sword is arc curve sword; On described arc curve, the tangent line of each point and cutter basal plane form the left and right cutting edge inclination of 0-30 °.

2. arcuate blade cutoff tool according to claim 1, is characterized in that, described arcuate blade is symmetrical, overall intermediate projections, and both sides fall, and on arcuate blade, the angle of cutting edge inclination of symmetrical 2 is equal, and in the middle of arcuate blade, the cutting edge inclination of peak is zero.

3. arcuate blade cutoff tool according to claim 1 and 2, is characterized in that, described arcuate blade is Circular Nose Cutting Edge.

4. arcuate blade cutoff tool according to claim 3, is characterized in that, described arc diameter is 80mm-1000mm.

5. arcuate blade cutoff tool according to claim 1 and 2, is characterized in that, on described arc curve, the tangent line of each point and cutter basal plane form the left and right cutting edge inclination of 0-15 °.

6. arcuate blade cutoff tool according to claim 1 and 2, is characterized in that, on described arc curve, the tangent line of each point and cutter basal plane form the left and right cutting edge inclination of 0-8 °.