CN222199175U

CN222199175U - Milling cutter structure

Info

Publication number: CN222199175U
Application number: CN202420747793.2U
Authority: CN
Inventors: 杨敦雁
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-21
Filing date: 2024-04-11
Publication date: 2024-12-20
Anticipated expiration: 2034-04-11
Also published as: TWM646023U

Abstract

The utility model provides a tooth milling cutter structure, which can reduce mutual interference with a tooth groove surface of an internal thread by means of the upward inclination angle of a cutter back strip, and can avoid contact friction with the tooth groove surface of the internal thread by means of the downward inclination angle, so that the abrasion of a cutter blade body is reduced, the service life of a cutter blade is prolonged while the cutting power loss is reduced, and the cutter handle can be disassembled through the working end of the cutter handle to simply replace the worn cutter blade, and the cutter handle can be reused, so that the processing cost or expense of tooth tapping is reduced.

Description

Tooth milling cutter structure

Technical Field

The utility model relates to a tooth milling cutter structure which is used for cutting an internal thread, wherein a cutter edge body of a cutter blade does not interfere and rub with a tooth groove surface, the cutter blade can be simply replaced after being worn, and a cutter handle can be recycled.

Background

After heat treatment, the steel workpiece is hard in texture, if an internal thread tooth hole is to be formed in the hard workpiece after heat treatment, an end mill can be used for drilling holes in the workpiece in advance, but a screw tap is difficult to tap on the drill holes directly, a discharge machining mode is adopted in a common mode, the discharge tapping is only time-consuming and labor-consuming, the machining cost is very high, only a milling cutter can be used for drilling and tapping, and the milling cutter tapping is helpful for improving the tapping machining efficiency, but the problem of overlarge cutter loss rate still exists.

A conventional tooth milling cutter is usually manufactured by adopting a tungsten steel alloy bar, and the manufacturing and shaping processing mode is greatly limited due to the hardness of the bar, as shown in fig. 1, 2 and 3, a cutter blade working end 12 is integrally manufactured at one end of a cutter handle 11, the cutter blade working end 12 is provided with a plurality of cutter blade parts 13 which are annularly arranged according to the axle center of the cutter handle 11, each cutter blade part 13 is formed by a plurality of cutter blade bodies 14 which are parallelly arranged upwards from bottom to top according to the screw pitch specification of a processing screw, each cutter blade body 14 is provided with a cutter back strip 140 with a V-shaped section and horizontally surrounds the axle center of the cutter handle, and two ends of the cutter back strip 140 are respectively provided with a V-shaped cutter blade surface 141 horizontally corresponding to each other; when the conventional milling cutter 10 is mounted on the rotary chuck of the milling machine for machining the internal thread 30 on a drilling hole 21 of the hard workpiece 20, as shown in fig. 4 and 6, since the horizontal arc body of the back strip 140 horizontally surrounded by the cutter body 14 and the spiral line 31 of the internal thread 30 cut by the cutter body have an interference angle α, an interference point 32 is caused, and the curved surface of the horizontal arc body of the back strip 140 is too close to the surface of the tooth groove of the internal thread 30, and an excessive friction contact surface 32 is caused, as shown in fig. 1, the conventional milling cutter 10 is used for tapping, as a result of excessive friction between the cutter body 14 and the tooth groove is difficult to overcome, and as a result, the cutter wear rate is too high, particularly as shown in fig. 1, the cutter body 13 of the conventional milling cutter 10 is integrally formed with the cutter handle 11 by high unit steel, the cutter needs to be used for trimming the cutter as long as the cutter body 14 has wear condition, and the hard workpiece is tapped, another major cause of high tooling costs is the fact that the tooling costs are high.

Disclosure of utility model

The utility model mainly aims at providing a tooth milling cutter structure.

The utility model provides a tooth milling cutter structure, which is characterized by comprising the following components:

The cutter handle is a metal round rod body and is provided with a clamping end and a working end, wherein the clamping end is used for clamping on a rotary clamping head of a milling machine to use the working end;

The cutter blade is a high-hardness steel sheet block, two side plate surfaces of the cutter blade block are provided with a relative number of through holes corresponding to the bolt holes on the working end of the cutter handle, each through hole is penetrated and fixed by a bolt piece on the bolt hole, the cutter blade is fixedly arranged in the clamping piece notch, at least one cutter blade body which radially extends out of the clamping piece notch is formed on the front and rear two side end surfaces between the two side plate surfaces, two ends of the cutter blade body are flush with the two side plate surfaces and are provided with a V-shaped cutter blade front surface and a V-shaped cutter blade back surface, a cutter back strip with a V-shaped cross section is arranged between the cutter blade front surface and the cutter blade back surface, the cutter back strip is upwards inclined and downwards inclined to connect the cutter blade front surface and the cutter blade back surface, the cutter back strip forms an included angle of at least more than 1 degree with the cutting angle horizontal line of the cutter blade front surface, and the cutter back strip forms an included angle of at least more than 2 degrees with the vertical line of the cutter blade front surface, and the cutter back strip forms a declining angle.

The milling cutter structure is characterized in that the cutter handle is formed by a steel metal round rod body to form the clamping end and the working end.

The tooth milling cutter structure is characterized in that the cutter handle is a stepped rod-shaped steel metal round rod body, and the cutter handle is provided with a clamping end with a larger diameter and a working end with a smaller diameter.

In the tooth milling cutter structure, a plurality of cutter edge bodies are correspondingly formed on the front and rear two side end surfaces of the two side plate surfaces of the cutter blade from bottom to top, and the cutter edge bodies are arranged in parallel at equal intervals on the side end surfaces by taking the pitch of the predetermined internal thread tapping as the interval.

The tooth milling cutter structure is characterized in that the cutter blade is fixedly arranged in the clamping piece notch, a plate bottom end is arranged at the bottom between the two side plate surfaces of the cutter blade, the cutter blade body is formed on the surface of the side end from the plate bottom end, and the plate bottom end protrudes out of the clamping piece notch.

The tooth milling cutter structure is characterized in that the upward inclination angle of the back strip is 4.6 degrees plus or minus 2 degrees.

The lower bevel angle of the back strip is 10 degrees plus or minus 5 degrees.

The tooth milling cutter structure is characterized in that the cutter blade is fixedly arranged in the clamping piece notch, at least one hole cutting cutter body part is arranged at the end part between the two side plate surfaces of the cutter blade, the hole cutting cutter body part is formed by cutting the side plate surface with a bevel back surface to form a hole cutting edge, the cutter blade body is formed on the side end surface by one side of the hole cutting edge, and the hole cutting edge protrudes out of the clamping piece notch.

The milling cutter is arranged on a milling machine rotary clamp and used for processing internal threads on a drilling hole of a high-hardness workpiece, the autorotation milling cutter enters the drilling hole in a spiral movement progress track, more than one processing reciprocating stroke of the milling cutter entering and exiting the drilling hole can be realized, the internal threads are milled on the hole wall of the drilling hole by the blade on the working end of the cutter handle, the mutual interference with the tooth groove surface of the internal threads can be reduced by the upward inclination angle of the cutter back strip in the process of milling and cutting the hole wall of the drilling hole, the contact friction with the tooth groove surface of the internal threads can be avoided by the downward inclination angle, the abrasion of the cutter blade body is reduced while the cutting power loss is reduced, the service life of the blade is prolonged, the replacement of the wearing blade can be simply realized by disassembling the working end of the cutter handle, and the cutter handle can be reused, so that the processing cost or expense of the screw teeth is reduced.

The cutter handle is made of a common steel material, the clamping end and the working end are formed by a metal round rod body, and the cutter handle is made of the steel material which does not need to be the same grade of high-hardness tungsten steel material as the cutter blade, so that the material cost for manufacturing the tooth milling cutter can be reduced.

The cutter handle is a steel metal round rod body in a stepped rod shape, the cutter handle is provided with the clamping end with a larger diameter and the working end with a smaller diameter, and the step rod-shaped step difference is formed between the clamping end and the working end, so that the shaking or vibration situation or phenomenon of the cutter blade on the working end can be reduced in the process of milling and cutting the internal thread teeth.

The cutting edge body is arranged in parallel with the pitch of the preset internal thread tapping on the edge end surface, when the cutting blade enters a workpiece drilling hole to perform internal thread tapping milling cutting on the hole wall, other cutting edge bodies except the first cutting edge body for milling the tooth groove of the internal thread on the hole wall can be used for trimming the groove surface in the cut internal thread.

The blade is fixedly arranged in the clamping piece notch, the bottom between the two side plate surfaces of the blade is provided with a plate bottom end, the blade body is formed on the side end surface from the plate bottom end, the plate bottom end slightly protrudes out of the clamping piece notch, when the blade of the milling cutter is used for the tapping of the internal thread of a workpiece before or after the tapping of the internal thread cutting processing of the workpiece is finished, the blade body connected with the plate bottom end can directly cut and finish the cutting of the guide angle at a working drill hole, and the thread can reach the depth limit of a blind hole when the blind hole is tapped.

The upper inclination angle of the back strip is 4.6 degrees plus or minus 2 degrees with the horizontal line of the cutting angle on the front surface of the cutting edge, so that the blade is used for conventional milling tapping processing of internal thread teeth with different pitches, and the back strip does not interfere with the tooth groove surface of the internal thread teeth.

Wherein the declination angle of the back strip is 10 degrees plus or minus 5 degrees relative to the vertical line of the front surface of the blade, so that the cutting angle of the front surface of the blade has cutting sharpness and strength.

The cutter blade is fixedly arranged in the clamping piece notch, at least one hole-cutting cutter body part is arranged at the end part between the two side plate surfaces of the cutter blade, the hole-cutting cutter body part is formed by cutting the side plate surface with a bevel back surface, the cutter blade body is formed on the side end surface by one side of the hole-cutting cutter blade, the cutter Kong Ren slightly protrudes out of the clamping piece notch, the cutter blade of the tooth-milling cutter is used for tapping a blind hole of a workpiece, and when the depth of the blind hole is insufficient or not in place, the hole-cutting cutter blade of the hole-cutting cutter body part can carry out repair hole-milling cutting on the deep bottom of the blind hole before the cutter blade body touches the bottom, so that the damage or fracture of the bottom of the cutter blade body can be avoided.

Drawings

Fig. 1 is a perspective view of a conventional tooth milling cutter.

Fig. 2 is a front plan view of a conventional tooth milling cutter structure.

Fig. 3 is a cross-sectional view A-A of fig. 2.

FIG. 4 is a schematic view of a conventional tooth milling cutter in a cross-sectional state.

FIG. 5 is a schematic plan view showing a sectional state of a workpiece when a conventional tooth milling cutter is used for tapping.

Fig. 6 is a schematic view showing the state of removing material from a blade body when a conventional tooth milling cutter attacks teeth.

Fig. 7 is a perspective view of a combination of the structure of the tooth milling cutter of the present utility model.

Fig. 8 is an exploded perspective view of the tooth milling cutter according to the present utility model.

Fig. 9 is a schematic front plan view of the structure of the tooth milling cutter of the present utility model.

Fig. 10 is a schematic plan view of the bottom view structure of the tooth milling cutter of the present utility model.

FIG. 11 is a schematic perspective view of a workpiece in a cross-sectional state when the tooth milling cutter of the present utility model is used for tapping.

Fig. 12 is a schematic plan view showing a cross-sectional state of a workpiece when the tooth milling cutter of the present utility model is used for tapping.

Fig. 13 is a schematic view showing a state of removing material from a blade body when the tooth milling cutter of the present utility model is used for tapping.

Fig. 14 is an exploded perspective view of a tooth milling cutter according to another embodiment of the present utility model.

Fig. 15 is a perspective view of a combination of a tooth milling cutter structure according to another embodiment of the present utility model.

FIG. 16 is a schematic view of blind hole tapping according to another embodiment of the present utility model.

The reference numerals describe the milling cutter 10, the handle 11, the blade working end 12, the blade portion 13, the blade body 14, the back strip 140, the blade face 141, the work piece 20, the drill 21, the blind hole 21A, the female screw thread 30, the spiral thread 31, the interference angle α, the interference point 32, the friction contact face 33, the milling cutters 40, 40A, the handle 50, the clamping end 60, the working end 70, the clip notch 71, the bolt hole 72, the blades 80, 80A, the side plate face 81, the side plate faces 81A, 81B, the through hole 82, the edge 83, the blade bodies 84, 84A, the blade front face 840A, the blade back face 840B, the back strip 841, the gap 842, the upper inclination angle β, the lower inclination γ, the cutting angle 85, the horizontal line 86, the vertical line 87, the plate bottom end 88, the cut hole cutter body 89, the bevel back face 890, the cut Kong Ren 891, and the bolt 90.

Detailed Description

The present utility model is directed to achieving the above objects, and particularly preferred embodiments thereof, and more particularly to the following detailed description in conjunction with the accompanying drawings, in which:

The present utility model provides a tooth milling cutter structure, as shown in fig. 7, 8, 9 and 10, which is a tooth milling cutter 40 comprising:

The tool handle 50 is a metal round bar body and is provided with a clamping end 60 and a working end 70, wherein the clamping end 60 is used for clamping on a rotary chuck (not shown) of a milling machine to use the working end 70, a U-shaped clamping piece notch 71 is axially formed on the end surface of the working end 70 towards the clamping end 60, and at least one bolt hole 72 is radially formed on the working end 70 of the clamping piece notch 71;

A blade 80, which is a sheet block of high hardness steel (such as tungsten steel alloy), and is formed by wire cutting, two side plates 81 are provided with opposite number of through holes 82 corresponding to the through holes 72 on the working end 70 of the shank 50, each of the blade 80 is fixedly arranged in the clip slot 71 by a bolt 90 penetrating through the through holes 82 on the through holes 72, and at least one blade body 84 extending radially out of the clip slot 71 is formed on the front and rear side 83 surfaces between the two side plates 81, the two ends of the blade body 84 are flush with the two side plates 81, and has a V-shaped blade front surface 840A and a V-shaped blade back surface 840B, the blade back surface 840A and the blade back surface 840B are provided with a blade back strip 841 having a V-shaped cross section, the blade back strip 841 is connected with the blade front surface 840A and the blade back surface 840B in an upward-inclined manner, and the upward-inclined angle beta of the blade back strip 841 is at least 1-2 degrees from the horizontal line of the blade front surface A and the downward-inclined angle 840 is at least more than the vertical line 85 degrees;

As shown in fig. 11, the milling cutter 40 is mounted on a rotary chuck (not shown) of a milling machine for machining the internal thread 30 on a drill 21 of a high-hardness workpiece 20 (heat-treated steel workpiece), the self-rotating milling cutter 40 enters the drill 21 in a spiral motion process track, that is, more than one machining reciprocation (the number of machining strokes is determined according to the depth of a tap groove) of the milling cutter 40 into and out of the drill 21, the internal thread 30 is milled on the wall of the drill 21 by the blade 80 on the working end 70 of the cutter handle 50, as shown in fig. 12 and 13, the blade body 84 of the blade 80 performs milling cutting on the wall of the drill 21, by means of the upward inclination angle beta (see fig. 9) of the back strip 841, mutual interference with the groove surface of the internal thread 30 can be reduced or eliminated, and the downward inclination angle gamma (see fig. 10) can avoid contact friction with the groove surface of the internal thread 30, reduce the wear loss by the blade 80 on the working end 70 of the cutter handle 50, and the wear loss of the cutter blade 50 can be reduced by the blade 80 as shown in fig. 12 and 13, and the wear loss of the cutter blade 50 can be reduced by the cutter blade 80 is replaced, and the cutter blade 50 can be easily and the cost can be reduced by the cutter blade 50 and the cutter blade 50 is replaced.

According to the above embodiment, as shown in fig. 7 and 8, the handle 50 is a metal round bar made of a common steel (such as a medium carbon steel grade steel) to form the clamping end 60 and the working end 70, and the material cost for manufacturing the tooth milling cutter 40 can be reduced by forming the handle 50 without using a high-hardness steel of the same grade as the blade 80.

According to the above embodiment, as shown in fig. 7 and 8, the shank 50 is a stepped bar-shaped steel metal round bar, and has the clamping end 60 with a larger diameter and the working end 70 with a smaller diameter, and the step bar-shaped step is formed between the clamping end 60 and the working end 70, as shown in fig. 11, so that the blade 80 on the working end 70 can reduce the shaking or vibration during the milling process of the female screw thread 30.

According to the above embodiment, as shown in fig. 7, 8 and 9, a plurality of blade bodies 84, 84A are formed on the front and rear side surfaces 83 of the side surfaces 81 of the blade 80, respectively, and the plurality of blade bodies 84, 84A are arranged in parallel with each other at the pitch 842 on the side surfaces 83 with respect to the pitch at the time of tapping a predetermined internal thread, and as shown in fig. 11 and 12, when the blade 80 enters the bore 21 of the workpiece 20, the first (front-most) blade body 84 is used to mill the internal thread 30 on the bore wall, and the other (rear-most) blade bodies 84A can trim the groove surface in the internal thread 30.

According to the above embodiment, as shown in fig. 7, 8 and 9, the blade 80 is preferably fixed in the clamping slot 71, a bottom plate 88 is provided between the two side plates 81 of the blade 80, the blade 84 is formed on the surface of the side end 83 from the bottom plate 88, and the bottom plate 88 protrudes slightly axially beyond the clamping slot 71, as shown in fig. 11 and 12, when the blade 80 of the milling cutter 40 is used for the tapping of the internal thread 30 of the workpiece 20 before or after the tapping is completed, the cutting of the guide angle is directly performed and completed at the hole 21 of the workpiece 20 by the blade 84 connected with the bottom plate 88, and the thread can reach the limit of the depth of the blind hole when the blind hole is tapped (not shown).

According to the above embodiment, the inclination angle β of the back strip 841 is preferably 4.6 degrees ±2 degrees from the horizontal line 86 of the cutting angle 85 of the front surface 840A, as shown in fig. 9, and the back strip 841 does not interfere with the groove surface of the female thread, as shown in fig. 12, so that the blade 80 is used for conventional milling tapping of female threads with different pitches.

According to the above embodiment, it is preferable that the blade 80A is fixed in the clip notch 71 as shown in fig. 14 and 15, at least one hole cutter body 89 is provided at the end between the two side plates 81A and 81B of the blade 80A, the hole cutter body 89 is formed by cutting the side plate 81A with a beveled back 890 to form a hole cutter 891, the cutter body 84 is formed on the surface of the side end 83 by one side of the cutter Kong Ren 891, and the cutter Kong Ren 891 protrudes slightly beyond the clip notch 71, as shown in fig. 16, the blade 80A of the tooth milling cutter 40A is used for tapping the blind hole 21A of the workpiece 20, and when the depth of the blind hole 21A is insufficient or not in place, the cutter Kong Ren 891 of the hole cutter body 89 can cut the deep hole bottom of the blind hole 21A in a repairing manner before the cutter body 84 bottoms out, so as to avoid the cutter body 84 from bottom damage or breaking.

According to the above embodiment, the lower bevel angle γ of the back strip 841 is preferably 10 degrees ±5 degrees from the vertical line 87 of the front surface 840A, as shown in fig. 10 and 13, so that the cutting angle 85 of the front surface 840A has both cutting sharpness and strength.

The foregoing description is illustrative only and not limiting, and it will be appreciated by those skilled in the art that numerous modifications, changes, or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims, but fall within the true scope of the utility model.

Claims

1. A tooth milling cutter structure, comprising:

2. The tooth milling cutter structure according to claim 1, wherein the cutter handle is formed with a steel metal round bar body to form the clamping end and the working end.

3. The tooth milling cutter structure according to claim 1, wherein the cutter handle is a stepped rod-shaped steel metal round bar body having the clamping end with a larger diameter and the working end with a smaller diameter.

4. The tooth milling cutter structure according to claim 1, wherein a plurality of blade bodies are formed on the front and rear side end surfaces of the two side surfaces of the blade, respectively, and the plurality of blade bodies are arranged in parallel at equal intervals on the side end surfaces with a pitch of a predetermined female thread tapping.

5. The tooth milling cutter structure according to claim 1, wherein the blade is fixedly arranged in the clamping piece notch, a bottom plate is arranged at the bottom between the two side plate surfaces of the blade, the blade body is formed on the side end surface from the bottom plate end, and the bottom plate end protrudes out of the clamping piece notch.

6. The tooth milling cutter structure of claim 1, wherein the rake angle of the back strip is between 4.6 degrees ± 2 degrees.

7. The tooth milling cutter structure of claim 1, wherein the lower bevel angle of the back strip is between 10 degrees ± 5 degrees.

8. The tooth milling cutter structure according to claim 1, wherein the blade is fixedly arranged in the clamping piece notch, at least one hole-cutting cutter body is arranged at the end part between the two side plate surfaces of the blade, the hole-cutting cutter body is formed by tangential connection of a bevel back surface and the side plate surface, the cutter body is formed on the side end surface by one side of the hole-cutting cutter body, and the hole-cutting cutter body protrudes out of the clamping piece notch.