CN107962256A - For processing the cutterhead of spiral bevel gear product - Google Patents

Abstract

The invention discloses a cutter head for processing spiral bevel gear products, which comprises an inner cutter body and an outer ring, the inner cutter body is circular, and a plurality of cutter grooves are arranged on its peripheral edge; the outer ring is set and fixed On the inner cutter body, and the outer ring is at the opening of the knife groove; wherein, the inner cutter body and the outer ring are of split structure. For example, the upper cutter head includes the inner cutter body and outer ring that are separated from each other, and the two can be processed separately, which is convenient for strictly controlling the roughness of the inner wall of the cutter groove, the cumulative error of the inner cutter groove and the outer cutter groove, and the adjacent error, etc. The manufacturing precision of the cutter head.

Description

Cutterheads for machining spiral bevel gear products

technical field

The invention relates to the technical field of machinery industry, and more specifically relates to a cutter head for processing spiral bevel gear products.

Background technique

At present, the milling of spiral bevel gears is mainly carried out by face milling and face hobbing. The cutter head for end face milling and end face hobbing of spiral bevel gears is usually equipped with multiple strip cutting blades. Consistency of the radial and axial position of the blade plays a vital role. In particular, the radial deviation of the blades will result in different cutting thicknesses for each blade, and the cutting edge will bear different degrees of load and wear, which will shorten the service life of the blades. different degrees of decline. Therefore, there are strict requirements on the manufacturing accuracy of the cutter head for spiral bevel gear milling.

The existing cutter head is an integral structure with a certain inclination angle at the sipes, and the structure is complicated. It is difficult to strictly control the roughness of the inner wall of the sipes, the cumulative error of the inner sipes and the outer sipes, and the adjacent errors. Disk manufacturing accuracy.

To sum up, how to make the cutter head easy to process, ensure that the roughness of the inner wall of the sipes, the cumulative error of the inner sipes and the outer sipes, the adjacent error, etc. can be strictly controlled, and how to improve the manufacturing accuracy of the cutter head is an urgent need for those skilled in the art. solved problem.

Contents of the invention

In view of this, the present invention provides a cutter head for processing spiral bevel gear products, which has an inner cutter body and an outer ring that are separated from each other, and the two can be processed separately, which is convenient for strictly controlling the roughness of the inner wall of the cutter groove during the processing , Cumulative errors of inner and outer sipes, adjacent errors, etc., to improve the manufacturing accuracy of the cutter head.

To achieve the above object, the present invention provides the following technical solutions:

A cutter head for machining spiral bevel gear products, comprising:

an inner cutter body, the inner cutter body is circular, and its peripheral edge is provided with a plurality of knife grooves;

an outer ring, the outer ring is fitted and fixed on the inner cutter body, and the outer ring is at the opening of the knife groove;

Wherein, the inner cutter body and the outer ring are split structures.

Preferably, in the above cutter head, the outer ring is in interference fit with the inner cutter body, and the outer ring and the inner cutter body are welded to each other.

Preferably, in the above cutter head, the knife grooves are evenly distributed along the circumference of the inner cutter body.

Preferably, in the above cutter head, the sipe includes an inner sipe for assembling the inner knife and an outer sipe for assembling the outer knife, and the inner sipe and the outer sipe are arranged alternately.

Preferably, in the above-mentioned cutter head, a set of screw holes are respectively provided on the outer ring corresponding to each of the cutter grooves;

Each set of screw holes includes an upper screw hole equipped with an upper set screw and a lower screw hole equipped with a lower set screw; the upper set screw and the lower set screw are used to press against the guide groove The inner knife strip, and adjust the position of the knife strip along the radial direction of the inner knife body.

Preferably, in the above cutter head, a compression spring is sleeved on the upper set screw, and the compression spring is used to abut against the upper set screw and the blade.

Preferably, in the above cutter head, the inner cutter body is provided with a mounting hole.

The invention provides a cutter head for processing spiral bevel gear products, which includes an inner cutter body and an outer ring, the inner cutter body is circular, and a plurality of knife grooves are provided on its peripheral edge; the outer ring is set and fixed on On the inner cutter body, and the outer ring is at the opening of the knife groove; wherein, the inner cutter body and the outer ring are of split structure.

For example, the upper cutter head includes the inner cutter body and outer ring that are separated from each other, and the two can be processed separately, which is convenient for strictly controlling the roughness of the inner wall of the cutter groove, the cumulative error of the inner cutter groove and the outer cutter groove, and the adjacent error, etc. The manufacturing precision of the cutter head.

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 the structural representation of the cutter head that is used for processing spiral bevel gear product that the embodiment of the present invention provides;

Fig. 2 is a schematic structural view of the inner cutter body provided by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an outer ring provided by an embodiment of the present invention;

Fig. 4 is the top view of the welding seam that the embodiment of the present invention provides;

Fig. 5 is the bottom view of the weld provided by the embodiment of the present invention;

Figure 6 is a cross-sectional view of a cutter head for processing spiral bevel gear products provided by an embodiment of the present invention;

Fig. 7 is the assembly diagram of set screw, spring and blade provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of the radial displacement of the tip of the knife strip provided by the embodiment of the present invention under different torque conditions of the upper and lower set screws.

Among them, in Figure 1-Figure 8:

Mounting hole 1; knife groove 2; assembly positioning surface 3; set screw 4; outer knife 5; inner knife 6; screw hole 7; welding seam 8; outer ring 9; inner knife body 10; compression spring 11.

Detailed ways

The embodiment of the invention discloses a cutter head for processing spiral bevel gear products, which has an inner cutter body and an outer ring that are separated from each other, and the two can be processed separately, which is convenient for strictly controlling the roughness of the inner wall of the cutter groove, The accumulative error and adjacent error of the inner and outer sipes improve the manufacturing accuracy of the cutter head.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1-Fig. 8, the embodiment of the present invention provides a kind of cutterhead that is used for processing spiral bevel gear product, and it comprises inner cutter body 10 and outer ring 9, and inner cutter body 10 is circular, and its peripheral edge A plurality of sipe grooves 2 are provided; the outer ring 9 is fitted and fixed on the inner cutter body 10, and the outer ring 9 circles at the opening of the sipe groove 2; wherein, the inner cutter body 10 and the outer ring 9 are split structures.

For example, the upper cutter head includes the inner cutter body 10 and the outer ring 9 which are separated from each other, and the two can be processed separately, which is convenient for strict control of the inner wall roughness of the sipe 2, the cumulative error of the inner sipe and the outer sipe, and the adjacent error, etc. , can improve the manufacturing accuracy of the cutter head.

In addition, the above-mentioned cutter head has a split structure, which does not need to adopt a special slow-moving wire-feeding manufacturing method, which can significantly reduce the equipment investment and production cost of the cutter head manufacturing. At the same time, the inner cutter body 10 and the outer ring 9 are processed separately, which is beneficial to shorten the manufacturing cycle of the cutter head and reduce the loss of scrapping the cutter head.

Specifically, in the above cutter head, the outer ring 9 and the inner cutter body 10 are in interference fit, and the outer ring 9 and the inner cutter body 10 are welded to each other.

For example, the upper sipes 2 are evenly distributed along the circumferential direction of the inner cutter body 10 . The blades required in the processing of spiral bevel gear products include an inner cutter 6 and an outer cutter 5, which are respectively used to process the convex surface and the concave surface of the spiral bevel gear. Correspondingly, the above-mentioned knife groove 2 includes an inner knife groove and The outer knife grooves for assembling the outer knife 5, the inner knife grooves and the outer knife grooves are alternately arranged. The installation height of the above-mentioned knife strips and the overall dimensions of the knife tip are determined according to the processed spiral bevel gear products, and the material of the knife strips can be selected from cemented carbide and high-speed steel.

Preferably, a set of screw holes 7 are respectively provided at positions corresponding to each sipe 2 on the outer ring 9; each set of screw holes 7 includes an upper screw hole equipped with an upper set screw and a lower set screw equipped with a lower set screw. Screw holes; the upper set screw and the lower set screw are respectively used to press against the knife strip in the knife groove 2 and adjust the radial position of the knife strip in the knife groove 2 along the inner cutter body 10 . The upper set screw corresponds to the tip of the blade, and the lower set screw corresponds to the body of the blade.

For example, the upper cutter head has an upper and lower double set screw structure. On the premise of not changing the axial position of the knife bar, the adjustment of the radial position of the knife bar can be realized by adjusting the torque of the two set screws 4, which is different from the prior art. Compared with the cutter head with single-hole screw structure, which sacrifices the axial accuracy of the blade to ensure the radial accuracy, it not only simplifies the tool installation process and steps, but also effectively improves the tool installation accuracy and efficiency.

Further, in the above-mentioned cutter head, a compression spring 11 is sleeved on the upper set screw, and the compression spring 11 is used to resist the upper set screw and the blade. The compression spring 11 squeezes the knife strip and provides friction to the knife strip, ensuring that the knife strip overcomes its own gravity during the vertical knife installation process, so that the knife strip is not easy to slip from the knife groove 2, and at the same time it can be conveniently pulled back and forth to adjust the knife strip. The axial position of the blade.

Please refer to FIG. 7 , the above-mentioned sipe 2 includes two oblique installation datum surfaces and one vertical installation datum surface. The inclined installation datum plane forms a certain angle with the central axis of the inner cutter body 10, and forms an angle of 90° with the vertical installation datum plane; the vertical installation datum plane is parallel to the central axis of the inner cutter body 10. The shape of the knife strip is rectangular and complementary to the shape of the knife groove 2. The head of the knife strip has a cutting edge. Keep a certain gap on the surface. The axis of the screw hole on the outer ring 9 is perpendicular to the axis of the outer ring 9 and parallel to the normal direction of the 90° vertical positioning surface of the corresponding sipe.

The head of the above-mentioned set screw 4 contains a smooth plane, which is in contact with the surface of the knife bar and relies on the screw tightening torque to make the knife bar close to the inclined installation reference plane and the vertical installation reference plane of the knife groove 2.

In the cutter head provided in the above embodiment, the inner conductor is provided with a mounting hole 1 for assembling with the spindle of the machine tool.

The inner diameter of the outer ring 9 is slightly smaller than the outer diameter of the inner cutter body 10. During the assembly process, the outer ring 9 is heated to 80°C so that the diameter of the outer ring 9 expands enough to fit on the inner cutter body 10. The screw holes 7 The position relative to the sipe 2 is positioned through the tooling to ensure that the axis of the screw hole 7 is perpendicular to the bottom surface of the sipe 2 corresponding to the screw hole 7 . As the temperature cools, the outer ring 9 shrinks, and the outer ring 9 is tightly fitted on the inner cutter body 10 to achieve an interference fit. After assembly, there is no height difference between the contact surfaces of the outer ring 9 and the inner cutter body 10 , thereby completing the assembly and positioning of each other. The amount of interference between the inner cutter body 10 and the outer ring 9 needs to be reasonably controlled. If the interference is too large, it will easily cause the extrusion deformation of the cutter groove 2, which will affect the accuracy of the cutter groove 2. In severe cases, the blade can not be installed normally. The small size easily causes the relative displacement between the outer ring 9 and the inner cutter body 10 before and after transportation or welding, and welding cannot be performed.

As shown in FIGS. 4 to 6 , the fastening of the outer ring 9 and the inner cutter body 10 is realized by welding to prevent relative displacement between the inner cutter body 10 and the outer ring 9 . The outer peripheral surface between adjacent cutter bodies on the inner cutter body 10 is an assembly positioning surface 3 , and the gap between the assembly positioning surface 3 and the outer ring 9 is a welding seam 8 . In order to ensure the welding strength, the welding is double-sided full welding. The welding method, welding depth and welding strength must be based on the control of welding deformation, so as to ensure that the precision of the finished cutterhead after welding will not be greatly lost. In order to consider that the position of the weld 8 is equal to the height of the inner cutter body 10 and the outer ring 9, the metal height of the molten pool of the weld 8 should be higher than the welding plane after the welding is completed, and part of the weld metal can be removed by machining to ensure a smooth welding surface smooth.

During the knife loading process, screw the set screw 4 into the screw hole 7, the head of the screw touches the knife bar and pushes it to be close to the installation positioning surface of the knife groove 2 (including the inclined installation reference plane and the vertical installation reference plane), close to the knife bar A compression spring 11 is installed at the upper set screw at the position of the upper tip of the knife. The frictional force of the compression spring 11 can ensure that the gravity of the knife bar is overcome in the vertical knife loading process, so that the knife bar is not easy to slip off from the knife groove 2, and at the same time It is convenient to pull and insert the blade back and forth to adjust the axial position of the blade.

The tightening torque of the upper and lower set screws corresponding to the same slit 2 can be adjusted freely. In order to ensure that the blade is fastened in the slit 2 and prolong the service life of the screws, the tightening torque of each set screw is between 12N·M Between -20N·M. The position of the knife point on the blade can be fine-tuned by applying different torques on the upper and lower set screws within a small range (usually 0.005 to 0.015). When the tightening torque of the upper set screw is greater than that of the lower set screw, the tip of the knife will face Move closer to the axis of the inner cutter body 10; when the tightening torque of the upper set screw is smaller than the tightening torque of the lower set screw, the tip of the knife moves away from the axis of the inner cutter body 10. The process of adjusting the radial tooling accuracy is carried out after the knife bar completes the adjustment of the axial tooling accuracy. High precision control.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A kind of 1. cutterhead for being used to process spiral bevel gear product, it is characterised in that including：

   Interior cutter hub, the interior cutter hub is circle, and its peripheral edge edge is equipped with multiple cutter grooves；

   Outer ring, the outer ring are set with and are fixed on the interior cutter hub, and outer ring circle is in the opening of the cutter groove；

   Wherein, the interior cutter hub and the outer ring are Split type structure.
2. 2. cutterhead according to claim 1, it is characterised in that the outer ring is interference fitted with the interior cutter hub, and described Outer ring is welded to each other with the interior cutter hub.
3. 3. cutterhead according to claim 1, it is characterised in that the cutter groove is uniformly distributed along the circumferential direction of the interior cutter hub.
4. 4. cutterhead according to claim 3, it is characterised in that the cutter groove includes being used for the interior cutter groove and use for assembling interior knife In the outer sipe for assembling outer knife, the interior cutter groove and the outer sipe interlaced arrangement.
5. 5. cutterhead according to claim 1, it is characterised in that on the outer ring position point corresponding with each cutter groove She You not one group of screw hole；

   Screw hole described in every group includes being equipped with the upper bolt aperture of holding screw and is equipped with the lower screw hole of lower holding screw； The upper holding screw and the lower holding screw are used to push against the tool section in the guide groove, and adjust the tool section along the interior knife The position of body radial direction.
6. 6. cutterhead according to claim 5, it is characterised in that holddown spring is set with the upper holding screw, it is described Holddown spring is used to offset with the upper holding screw and the tool section.
7. 7. cutterhead according to claim 1, it is characterised in that the interior cutter hub is equipped with mounting hole.