CN104493216A - Cut-off tool with A-shaped cutting edge - Google Patents

Abstract

The invention discloses an A-shaped cutting knife. The A-shaped cutting knife includes a knife handle, a knife head and an A-shaped cutting edge located in front of the knife head. The A-shaped cutting edge is a broken-line edge separated from the left and right. The A-shaped cutting knife of the present invention is left-right symmetrical as a whole, and its cutting edge adopts a left-right symmetrical broken line edge, and the front is divided into two parts, and the inclined directions of the left half part and the right half part are symmetrical. The A-shaped cutting knife of the present invention can not only realize oblique cutting, but also has the function of chip separation, and also has the self-centering feature, which avoids the breakage of the cutter head and ensures the shape and position accuracy of the cut groove.

Description

A shape cutting knife

technical field

The invention relates to the technical field of cutting tools, in particular to an A-shaped cutting tool.

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.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to overcome the defects of the existing cutting knives. When the cutting knives are cutting, it can not only ensure the bevel cutting, but also ensure that the knife head will not be squeezed to one side, thereby providing an A-shaped cutting blade. knife.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides an A-shaped cutting knife, which includes a handle, a cutter head, and an A-shaped cutting edge located in front of the cutter head, and the A-shaped cutting edge is separated from the left and right sides. The folding line edge; the folding line blades on the left and right sides are oblique blades, and the oblique blades on the left and right sides form a blade inclination angle of 1-30° with the base surface of the tool.

Preferably, the fold-line edge is left-right symmetrical, with a raised center in the whole and lowered sides, and the inclination angle of the left edge and the right edge are equal.

Preferably, the left and right beveled edges form an inclination angle of 3-15° with the base surface of the tool.

Preferably, the beveled edges on the left and right sides form an inclination angle of 6° with the base surface of the tool.

The edge inclination mentioned above is the angle between the cutting edge and the base surface of the tool. 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 cutter is a plane parallel to the installation bottom surface of the cutter.

(3) Beneficial effects

The A-shaped cutting knife of the present invention is left-right symmetrical as a whole, and its cutting edge adopts a left-right symmetrical broken line edge, and the front is divided into two parts, and the inclined directions of the left half part and the right half part are symmetrical. The invention can realize bevel cutting, has the function of dividing chips, and also has the self-centering characteristic, avoids the breakage of the cutter head, and ensures the shape and position accuracy of the groove to be cut.

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 drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. 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 an A-shaped cutting knife of the present invention;

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 A-shaped cutting knife of the present invention in a 45-degree plan view direction;

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

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

Example 1

As shown in Figure 3, the A-shaped edge cutting knife involved in this embodiment includes a handle 1, a cutter head 2, and an A-shaped cutting edge 3 located in front of the cutter head, and the A-shaped cutting edge is a broken line edge separated from the left and right; wherein The left and right sides are oblique blades 3-1 and 3-2, and the left and right oblique blades form a blade inclination angle of 5° with the cutter base surface.

Specifically, the A-shaped edge cutting knife involved in this embodiment adopts a left-right symmetrical broken line edge, the whole center is raised, and both sides fall down, and the blade inclination angles of the left half cutting edge and the right half cutting edge are the same. When cutting, as shown in Figure 6, the left and right cutting edges can realize bevel cutting at the same time. Since the inclination direction of the front of the left half and the front of the right half are different and exactly opposite, the chips are naturally divided into two parts during cutting. The normal component force on the left half cutting edge and the right half cutting edge cancel each other out in the horizontal direction, the cutter head will not be broken and bent under this force, and the folding line edges on both sides are symmetrical to each other, which has the function of self-centering. Features, this feature can ensure that the cut groove is perpendicular to the axis of the workpiece. Therefore, the present invention can realize oblique cutting, has the function of chip separation, and also has the self-centering feature, which avoids the breakage of the cutter head and ensures the shape and position accuracy of the cut groove.

Example 2

Compared with Embodiment 1, the only difference is that in this embodiment, the beveled blades on the left and right sides form an 8° blade inclination angle with the base surface of the tool.

Example 3

Compared with Embodiment 1, the only difference is that in this embodiment, the beveled edges on the left and right sides form a blade inclination angle of 12° with the base surface of the tool.

Tool installation and use:

Straight-edged cutting knife: As shown in Figure 4, install the workpiece on the lathe, clamp the left end with a three-jaw chuck, and tighten the right end with the top, and place the axis of the workpiece horizontally. Install the tool on the tool holder, the tool handle is pressed tightly with bolts, the tool head is punched forward, and the axis of the tool is placed horizontally and perpendicular to the axis of the workpiece. The cutting edge of the straight edge cutting knife is a horizontal straight line. Before processing, adjust the cutting edge of the tool and the axis of the workpiece to be in the same horizontal plane, so that the workpiece can be completely cut off. During processing, the workpiece rotates around the axis at a constant speed, and the left-view direction is counterclockwise, and the tool feeds toward the workpiece along its own axis at a constant speed. Chips flow out the front. When the cutting edge of the tool reaches the position of the axis of the workpiece and coincides with it, the workpiece is cut off. Or when the tool reaches the process size of the grooving, the grooving is complete.

Inclined cutting knife: As shown in Figure 5, the tool installation and workpiece installation are similar to the straight cutting knife. When the oblique cutting knife is installed, the tip point on the left is also the highest point of the blade, and it should be adjusted to be in the same horizontal plane as the axis of the workpiece. When the cutting edge is fed into the workpiece axis, the workpiece is cut off.

The A-shaped cutting knife of the present invention: as shown in Figure 6, when cutting or grooving, the workpiece is clamped on the lathe, the left end is clamped with a three-jaw chuck, the right end is pushed in the center hole with the top, and the lathe spindle rotates. Drive the three-jaw chuck and the workpiece to rotate counterclockwise at a constant speed in the left view direction, install the tool on the tool holder, the tool body is horizontal, and the axis of the tool is perpendicular to the axis of the workpiece. When installing the tool, adjust the intersection point of the left and right blades on the tool, that is, the tip of the tool point, which is in the same horizontal plane as the axis of the workpiece. When cutting or grooving, the tool cuts into the workpiece at a constant speed along the feed direction A perpendicular to the axis of the workpiece in the horizontal plane. Parting is complete when the tool nose point is fed to the workpiece axis. Or when the tool nose point is fed to the process dimension in the groove depth direction, the grooving is completed. After parting or grooving is completed, the tool stops feeding and returns along the original path. After the cutter is cut off, two symmetrical small cones will be left on the left and right sections of the workpiece, which is suitable for small cutting force, precise axial dimension, high perpendicularity of the workpiece cutting surface to the workpiece axis, high requirements for tool life, and It is suitable for occasions where the section requirements after cutting are not high or where a small vertebral body is required. After the cutting tool is finished, the side of the groove is a plane perpendicular to the axis of the workpiece, and the bottom of the groove is a hyperboloid symmetrical to the axis of the tool. The verticality of the groove side to the workpiece axis is high, the requirements for tool life are high, the requirements for the bottom of the groove are not high, or the hyperbolic surface is required for the bottom of the groove. If the bottom of the groove needs a cylindrical surface, the bottom of the groove can be finished.

The present invention has the following effects: 1. The cutting edge is a broken line edge, which is divided into two sections, both of which are oblique edges with the same inclination angle. The front corresponding part is divided into two parts, and the direction of inclination is symmetrical. 2. The two-stage bevel cutting belongs to bevel cutting, and the chips are naturally divided into two parts. 3. The cutting knife is left-right symmetrical as a whole, the normal component force on the left bevel and the right bevel cancel each other out in the horizontal direction, the cutter head will not be broken and bent, and has the characteristic of self-centering. 4. The inclination angle of the inclined blades on both sides can be adjusted according to different workpiece materials and working environments.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention 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 invention do not depart from the spirit and scope of the technical solutions of the present invention, and all should cover Within the scope of the claims of the present invention.

Claims (4)

1. an A shape sword cutoff tool, is characterized in that, the A shape cutting edge that this A shape sword cutoff tool comprises handle of a knife, cutter head and is positioned at cutter head front, and described A shape cutting edge is the broken line sword of dividing right and left; The broken line sword of described the right and left is oblique sword, and the oblique sword of this right and left and cutter basal plane form the cutting edge inclination of 1-30 °.

2. A shape sword cutoff tool according to claim 1, it is characterized in that, described broken line sword is symmetrical, overall intermediate projections, and both sides fall, and the angle of left cutting edge inclination and right cutting edge inclination is equal.

3. A shape sword cutoff tool according to claim 1 and 2, it is characterized in that, the oblique sword of described the right and left and cutter basal plane form the cutting edge inclination of 3-15 °.

4. A shape sword cutoff tool according to claim 3, it is characterized in that, the oblique sword of described the right and left and cutter basal plane form the cutting edge inclination of 6 °.