TWM510207U - Thread tool - Google Patents

Description

Thread cutter

This creation is about a tool, especially a threaded knife that is used to machine a workpiece.

Please refer to FIG. 1 , which is a conventional thread cutter 9 . The front end of the conventional thread cutter 9 is equiangularly distributed on the circumferential surface of the ring with a plurality of tooth blade portions 91 of the same specification, and each of the blade edges 91 is adjacent to each other. A chip flute 92 is provided on the side, and a plurality of cutting knives 911 are provided on the outer side of each of the blade edges 91. According to this configuration, when the conventional thread cutter 9 is rotated at a high speed, the surface of a workpiece can be cut by the plurality of blade portions 91 to form a thread on the surface of the workpiece. An embodiment similar to the conventional thread cutter 9 has been disclosed in the Patent No. M497574 of the Republic of China.

Wherein, after a certain number of cutting passes, the plurality of cutting knives 911 of each of the dental blade portions 91 are passivated and need to be ground to make them sharp again; however, due to the plurality of dental knives of the conventional threading knives 9 The portions 91 are not connected, so that the dressing operation cannot be continuously performed, but the respective blade portions 91 are ground one by one. In this way, not only is the grinding operation difficult to operate, but the grinding efficiency is not good, and the degree of grinding of the plurality of cutting knives 911 of each of the dental blade portions 91 is also difficult to be consistent, thereby directly affecting the cutting quality, so the conventional knowledge Most of the thread cutters 9 can only be allowed to be trimmed one or two times, otherwise the cutting error value will be too large and affect the product yield.

In view of this, the conventional thread cutters do have the necessary improvements.

This creation provides a threaded knife that improves the convenience of sharpening the cutting edge and ensures a good grinding effect to maintain good cutting quality.

This creation provides a thread cutter that can be repaired many times without reducing the cutting quality and can greatly extend the service life of the thread cutter.

The thread cutter of the present invention comprises: a handle; and a cutter head coaxially connected to one end of the cutter handle, the cutter head has at least one cutting edge on the circumferential surface of the cutter head, and a chip flute is provided by the cutter a free end face of the head extends through the cutting edge and extends toward the shank, the cutting edge being furthest from the end edge of the center of the cutter head forming a blade portion, the blade portion abutting the end of the chip flute to form a large diameter end point, The other end of the blade adjacent to the chip flute forms a small diameter end point, and the distance from the blade portion to the center of the cutter head is decreased from the end point of the large diameter to the end point of the small diameter.

Wherein, the shank has a central axis, and the cutting edge of the cutting edge is coaxial with the central axis of the shank.

Wherein the wall surface of the chip flute has a line at the end of the large diameter, the tangential line having an angle with a radial line passing through the end point of the large diameter; the wall surface of the chip flute is at the end of the small path There is another tangent that has another angle with the radial line passing through the end of the small path; the difference between the two angles is greater than or equal to 5°.

Wherein, the difference between the two angles is preferably less than or equal to 15°.

According to this, the thread cutter of the present invention can improve the operation convenience of the grinding operation, improve the grinding efficiency, ensure the grinding effect is good, maintain good cutting quality for the workpiece, and prolong the service life of the thread cutter to reduce the tool loss. Multiple effects such as cost.

[this creation]

1‧‧‧Knife

2‧‧‧ cutter head

21‧‧‧ cutting edge

211‧‧‧blade

22‧‧‧ chip flutes

A‧‧‧ center axis

D1, D2, D3‧‧‧ distance

L1, L2‧‧‧ tangent

P1‧‧‧ Great Path Endpoint

P2‧‧‧ trail end

P3, P4‧‧‧ endpoint

θ 1, θ 2‧‧‧ angle

[Use]

9‧‧‧Threading Knives

91‧‧‧ teeth blade

911‧‧‧Cutting cutter

92‧‧‧chip flute

Figure 1: Schematic diagram of a conventional thread cutter.

Fig. 2 is a perspective view showing the structure of an embodiment of the present invention.

Figure 3 is a schematic view showing the planar structure of an embodiment of the present invention.

Fig. 4 is a schematic view showing the radial cross-sectional structure of the cutting edge of an embodiment of the present invention.

Fig. 5 is a schematic view showing another radial sectional structure of the cutting edge of an embodiment of the present invention.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Referring to Figures 2 and 3, It is an embodiment of the present invention. The thread cutter generally comprises a shank 1 and a cutter head 2, and the cutter head 2 is connected to one end of the shank 1.

The shank 1 has a central axis A, which can be clamped on the chuck of a rotary machining machine such as a lathe or a milling machine, so that the cutter head 2 of the thread cutter can accurately align with the workpiece and the workpiece Perform machining operations for cutting threads.

The cutter head 2 is coaxially coupled to one end of the shank 1 to be synchronously rotated by the shank 1. At least one cutting edge 21 is provided on the circumferential surface of the cutter head 2. The number of the cutting edges 21 can be selected according to the number of threads to be formed, which is understood by those skilled in the art; this embodiment The figure is represented by a cutter head 2 provided with a plurality of cutting edges 21, but is not limited thereto.

The plurality of cutting edges 21 are arranged side by side, and the cutting head 2 is further provided with a chip flute 22 which passes through the plurality of cutting edges 21 and extends toward the shank 1 by the free end surface of the cutting head 2 The chips generated when the workpiece is cut can be removed through the chip flute 22, thereby maintaining the smoothness of the cutting process.

Referring to FIGS. 3 and 4, the edge of each of the cutting edges 21 farthest from the center of the cutter head 2 (where the central axis A passes) forms a blade portion 211, which is also associated with the center axis of the shank 1. A coaxial axis, the blade portion 211 adjacent to one end of the chip flute 22 forms a large diameter end point P1, and the blade portion 211 adjoins the other end of the chip flute 22 to form a small diameter end point P2, the blade portion 211 to The distance from the center of the cutter head 2 is reduced from the large diameter end point P1 to the small diameter end point P2.

According to the foregoing structure, when the machine tool drives the thread cutter to rotate at a high speed, a brand new The threaded cutter will contact the workpiece by the large-diameter end point P1 of its cutting edge 21, and the surface of the workpiece will be cut to form a thread on the surface of the workpiece. After a certain number of cutting times, the large-diameter end point P1 of the thread cutter will be passivated; at this time, the operator only needs to grind the vicinity of the large-diameter end point P1 to reduce the section to the cutter head 2 The distance from the center is such that the end point P3 closest to the large-diameter end point P1 in the portion of the blade portion 211 which is not ground is the most convex portion on the cutting edge 21. That is, the end point P3 is located between the large-diameter end point P1 and the small-diameter end point P2, and the distance D3 from the end point P3 to the center of the cutter head 2 is originally smaller than the distance D1 and larger than the distance D2, after being repaired, The distance D3 from the end point P3 to the center of the cutter head 2 is greater than the distance D1 and the distance D2. Accordingly, the threaded knife will be able to contact the workpiece by the end point P3 on its cutting edge 21 to cut the forming thread on the surface of the workpiece.

And so on, when the end point P3 is passivated, the vicinity of the end point P3 is repaired to reduce the distance of the section to the center of the cutter head 2, so that the blade portion 211 is not ground. In the section, the end point P4 closest to the end point P1 of the large diameter becomes the most convex portion on the cutting edge 21.

Referring to FIG. 5, the wall surface of the chip flute 22 has a line L1 at the large-diameter end point P1, and the tangent line L1 has an angle θ 1 with a radial line passing through the large-diameter end point P1 ( That is, the cutting angle of the thread cutter; the wall surface of the chip flute 22 has a line L2 at the end point P2 of the small diameter, and the tangent line L2 has an angle θ with a radial line passing through the end point P2 of the small diameter 2. The difference between the angle θ 1 and the angle θ 2 is greater than or equal to 5°. If the difference is less than 5°, the thread cutter can easily interfere with the lead angle of the thread when cutting the thread into the workpiece; In contrast, the larger the difference between the two angles θ 1 and θ 2 is, the shorter the circumference of the blade portion 211 is, and the number of times the thread cutter can be polished is reduced, so the difference is preferably less than or equal to 15 °.

In summary, the thread cutter of the present invention can be used for the user to remove the passivated portion of the cutting edge, and the cutting process is continued without being ground to the sharp part, so the goal of the grinding is to passivate. The part is removed, instead of re-grinding the passivated part to sharpness, making the grinding operation quite easy to operate and quick to complete; for a threaded knife with several cutting edges, it is also relatively It is easy to make the effect of grinding the cutting edges consistent. Therefore, the thread cutter of this creation can maintain good cutting quality.

Furthermore, the thread cutter of the present invention can be repaired many times without lowering the cutting quality, and the entire blade portion of the cutting edge can be sequentially used as a part for cutting the workpiece after different grinding operations until the blade is used. After the end of the part (at the end of the small diameter) is also passivated, the threaded knife needs to be eliminated, so its service life is about tens of times more than that of the conventional thread cutter. Therefore, the thread cutter of this creation can be used for a long time, reducing the cost of tool loss.

Although the present invention has been disclosed by the above-described preferred embodiments, it is not intended to limit the present invention, and it is still within the spirit and scope of the present invention to make various changes and modifications to the above embodiments. The technical scope of the protection is created, so the scope of protection of this creation is subject to the definition of the patent application scope attached.

1‧‧‧Knife

2‧‧‧ cutter head

21‧‧‧ cutting edge

211‧‧‧blade

22‧‧‧ chip flutes

Claims (4)

A thread cutter comprising: a shank; and a cutter head coaxially connected to one end of the shank, the cutter head having at least one cutting edge on the circumferential surface thereof, and a chip flute being free from the cutter head An end surface extends through the cutting edge and extends toward the shank, the cutting edge forming a blade portion farthest from the edge of the center of the cutting head, the blade portion forming a large diameter end point adjacent to one end of the chip flute, the blade portion abutting The other end of the chip flute forms a small diameter end point, and the distance from the blade portion to the center of the cutter head is decreased from the end point of the large diameter to the end point of the small diameter. The thread cutter of claim 1, wherein the shank has a central shaft, the cutting edge of the cutting edge being coaxial with the central axis of the shank. The thread cutter of claim 2, wherein the wall surface of the chip flute has a line at the end of the large diameter, the tangent having an angle with a radial line passing through the end point of the large diameter; The wall surface of the chip flute has another tangent at the end of the small diameter, the other tangent has another angle with the radial line passing through the end point of the small path; the difference between the two angles is greater than or equal to 5° . The thread cutter of claim 3, wherein the difference between the two angles is less than or equal to 15°.