CN217941661U - Internal hob and pipe bending equipment - Google Patents

Abstract

The utility model provides an interior hobbing cutter and return bend equipment relates to pipe fitting processing technology field, for solving after utilizing current interior hobbing cutter cutting pipe fitting, the pipe fitting can produce the problem design of more obvious throat. The inner hob comprises a hob body and a cutting edge, wherein the hob body is annular, the cutting edge is arranged on the inner circumferential surface of the hob body, and the cutting edge is arranged in a whole circle along the inner circumferential surface of the hob body; the cutting edge includes blade, lateral surface and interior sword, and the both sides of blade are located to lateral surface and interior sword branch, and wherein, the lateral surface parallels with the radial plane of hobbing cutter body, and the plane of interior sword place is the angle and intersects the formation blade with the lateral surface. The utility model discloses make when utilizing the blade to cut the pipe fitting, can not produce the throat because outer blade angle, can control the throat rate after the pipe fitting cutting within 2% to effectively improve current interior hobbing cutter cutting pipe fitting after, the pipe fitting can produce the more technical problem of obvious throat.

Description

Internal hob and pipe bending equipment

Technical Field

The utility model relates to a pipe fitting processing technology field particularly, relates to an interior hobbing cutter and return bend equipment.

Background

In the pipe bending equipment of two pipe fittings in the market, the chipless cutting technology gradually replaces the chipless cutting technology due to the characteristics of no splashing, cleanness, environmental protection and the like. The core part of the chipless cutting technology is a hob structure, and the quality of the hob structure directly influences the cutting quality of the pipe fitting.

At present, internal hobs are mostly used in chipless small U pipe bending machines and high-speed long U pipe bending machines in the prior art, but after the existing internal hobs are used for cutting pipe fittings, the pipe fittings can produce obvious necking.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide an interior hobbing cutter to after the solution utilized current interior hobbing cutter cutting pipe fitting, the pipe fitting can produce the more technical problem of obvious throat.

The utility model provides an inner hob, which comprises a hob body and a cutting edge, wherein the hob body is annular, the cutting edge is arranged on the inner peripheral surface of the hob body, and the cutting edge is arranged in a whole circle along the inner peripheral surface of the hob body; the cutting edge comprises a cutting edge, an outer side face and an inner edge, the outer side face and the inner edge are respectively arranged on two sides of the cutting edge, wherein the outer side face is parallel to a radial plane of the hob body, and the plane where the inner edge is located and the outer side face form an angle and are intersected to form the cutting edge.

When the pipe fitting needs to be cut and machined, the inner hob performs eccentric rotation motion relative to the center of the pipe fitting, the pipe fitting extends into the inner hob from one end, close to the outer side face, of the inner hob, and the center line of the pipe fitting is parallel to the center line of the inner hob. In the eccentric rotating process of the inner hob, the cutting edge of the cutting edge applies extrusion force to the pipe fitting to cut off the pipe fitting. Through the original outer sword with the cutting edge, set up to the lateral surface that parallels with the radial plane of hobbing cutter body, promptly: the double-blade structure that will interior hobbing cutter in the past changes single-blade structure (only interior sword) into for when utilizing the blade to cut the pipe fitting, can not produce the throat because outer edge angle, can control the throat rate after the pipe fitting cutting within 2%, thereby effectively improved current interior hobbing cutter cutting pipe fitting after, the pipe fitting can produce more obvious technical problem of throat.

Further, the cutting edge is an outward convex cambered surface. So set up for the blade produces certain passivation, can effectively prevent to collapse the situation of sword and appear, has played certain guard action to interior hobbing cutter, has prolonged the working life of interior hobbing cutter.

Furthermore, the cambered surface is an arc surface, the radius of the arc surface is R, wherein R is more than or equal to 0.05mm and less than or equal to 0.1mm. So set up, on the one hand, can avoid reducing because of the blade sharpness that blade cambered surface radius too big leads to, on the other hand can also avoid leading to preventing collapsing the obscure situation of sword effect because of blade cambered surface radius undersize.

Furthermore, an included angle between the plane where the inner edge is located and the outer side face is theta, wherein theta is larger than or equal to 8 degrees and smaller than or equal to 12 degrees. So set up, on the one hand, avoided because of the reduction of cutting edge intensity and cutting edge and hobbing cutter body joint strength that theta undersize leads to, on the other hand, also avoided because of the too big waste of the cutting edge material that causes of theta to the cost of hobbing cutter in this embodiment has been practiced thrift.

Further, the hob body and the cutting edge are of an integrated structure. This setting is not only convenient for the manufacturing of interior hobbing cutter, moreover, can also improve the structural strength of cutting edge and the hobbing cutter body junction.

Further, the outer peripheral surface of hobbing cutter body is provided with the installation department, the installation department is configured with the equipment main part fixed connection of return bend equipment. The reliable connection of the equipment main body of the inner hob and the pipe bending equipment can be guaranteed by the arrangement of the installation part, so that the reliability of pipe fitting cutting is guaranteed.

Further, the material of the inner hob is ASP30 (high cobalt powder metallurgy high speed steel). The arrangement ensures that the inner hob has good grinding performance and good wear resistance, so that the service life of the inner hob is prolonged, and the maintenance frequency of the inner hob is reduced.

Further, the outer surface of the inner roller cutter is provided with a DLC (DIAMOND-LIKE CARBON) coating. The inner hob cutter is high in hardness and abrasion resistance due to the arrangement, and the service life of the inner hob cutter can be greatly prolonged.

Furthermore, the thickness of the DLC coating is B, wherein B is more than or equal to 5 mu m and less than or equal to 10 mu m. So set up, on the one hand, can avoid promoting limited situation because of the interior hobbing cutter life that the DLC coating leads to thin, on the other hand, can also avoid because of the DLC coating is too thick the material waste that leads to the manufacturing cost of interior hobbing cutter has been reduced.

A second object of the utility model is to provide a pipe bending equipment to after solving and utilizing current interior hobbing cutter cutting pipe fitting, the pipe fitting can produce the more technical problem of obvious throat.

The utility model provides a pipe bending equipment, hobbing cutter in equipment principal and the aforesaid, interior hobbing cutter pass through the outer peripheral face with equipment principal fixed connection, equipment principal can drive interior hobbing cutter carries out eccentric rotary motion for the pipe fitting center.

By arranging the inner hob in the pipe bending equipment, when the pipe fitting needs to be cut and processed, the equipment main body of the pipe bending equipment drives the inner hob to perform eccentric rotation movement relative to the center of the pipe fitting, and the pipe fitting is cut off by using the pressure of the cutting edge on the pipe fitting. Accordingly, the pipe bending equipment has all the advantages of the inner hob and is not described in detail.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic axial cross-sectional view of a prior art inner hob;

FIG. 2 is a schematic axial cross-sectional view of a prior art inner hob cutting a pipe;

fig. 3 is an axial cross-sectional schematic view of an inner hob provided in an embodiment of the present invention;

fig. 4 is a schematic axial cross-sectional view of the inner hob cutting pipe provided in the embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of the structure at A in FIG. 3;

fig. 6 is a schematic view illustrating a pipe cutting principle of the inner hob according to an embodiment of the present invention;

fig. 7 is a left side view of the inner roller cutter of fig. 3.

Description of reference numerals:

210' -cutting edge; 220' -an outer edge; 230' -inner edge; 010' -a tube; 011' -necking;

100-hob body; 200-a blade edge; 010-a pipe fitting;

110-inner peripheral surface; 120-outer peripheral surface; 130-a mounting portion;

210-cutting edge; 220-outer side; 230-inner edge.

Detailed Description

Fig. 1 is a schematic axial cross-sectional view of an inner hob provided in the prior art, and fig. 2 is a schematic axial cross-sectional view of an inner hob provided in the prior art for cutting a pipe 010'. Most of the chipless small U-shaped pipe bending machines and high-speed long U-shaped pipe bending machines in the prior art use internal rolling cutters, but because the pipe bending machines are of double-edge structures, as shown in fig. 1, the cut pipe 010 'can generate a relatively obvious necking 011', as shown in fig. 2. Specifically, with reference to fig. 2, when the inner roller cutter works, the inner roller cutter performs an eccentric rotation movement with respect to the center of the pipe 010', and the pipe 010' is cut off by the pressing force of the cutting edge 210' to the pipe 010', wherein the center line of the pipe 010' is at O ₁ ' indicates that the center line of rotation of the inner hob is indicated by O ₂ 'to the contrary, the cutting edge 210' is flanked by an outer edge 220 'and an inner edge 230', respectively; the plane in which the outer edge 220' is located is inclined with respect to the radial plane of the inner hob. This causes the cut end face of the pipe 010 'to be affected by the bevel of the outer blade 220' after the pipe 010 'is cut by the cutting edge 210', which results in a necking 011', affecting the quality of the cut pipe 010'.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Fig. 3 is a schematic axial cross-sectional view of the inner hob provided in this embodiment, fig. 4 is a schematic axial cross-sectional view of the inner hob provided in this embodiment for cutting the pipe 010, and fig. 5 is an enlarged view of a partial structure at a in fig. 3. As shown in fig. 3 to 5, the present embodiment provides an inner hob cutter, which includes a hob body 100 and a cutting edge 200, specifically, the hob body 100 is annular, the cutting edge 200 is disposed on an inner circumferential surface 110 of the hob body 100, and the cutting edge 200 is disposed along the inner circumferential surface 110 of the hob body 100 in a complete circle; the cutting edge 200 comprises a cutting edge 210, an outer side 220 and an inner edge 230, wherein the outer side 220 and the inner edge 230 are respectively arranged on two sides of the cutting edge 210, the outer side 220 is parallel to a radial plane of the hob body 100, and a plane where the inner edge 230 is located and the outer side 220 form an angle and intersect to form the cutting edge 210.

Fig. 6 is a schematic view of a principle of the pipe cutting part 010 of the inner hob according to the present embodiment. As shown in fig. 6, when the pipe 010 needs to be cut, the inner roller performs an eccentric rotation movement with respect to the center of the pipe 010 (the center line of the pipe 010 is at O) ₁ The rotation center line of the inner hob is shown as O ₂ Showing that S represents the motion trajectory of the inner hob) into which the pipe 010 is inserted from the end of the inner hob close to the outer side 220, wherein the centre line of the pipe 010 is parallel to the centre line of the inner hob. In the process of eccentric rotation of the inner hob, the cutting edge 210 of the cutting edge 200 applies a pressing force to the pipe 010 to cut the pipe 010. By arranging the original outer edge of the cutting edge 200 as an outer side 220 parallel to the radial plane of the hob body 100, namely: change interior hobbing cutter twofold blade structure in the past into the single-edge structure (only interior sword 230) for when utilizing blade 210 to cut pipe fitting 010, can not produce the throat because outer blade angle, can control the throat rate after the pipe fitting 010 cuts within 2%, thereby effectively improved current interior hobbing cutter cutting pipe fitting 010 back, pipe fitting 010 can produce more obvious technical problem of throat.

In this embodiment, the hob body 100 and the cutting edge 200 are an integral structure. This setting not only is convenient for the manufacturing of interior hobbing cutter, moreover, can also improve the structural strength of cutting edge 200 and the 100 junction of hobbing cutter body.

Referring to fig. 5, in the present embodiment, the cutting edge 210 is a convex arc surface. Wherein "convex" means arched towards the rotational centerline of the inner hob.

The cutting edge 210 is arranged to be the convex arc surface, so that the cutting edge 210 is passivated to a certain extent, the situation of knife breakage can be effectively prevented, the inner hob is protected to a certain extent, and the service life of the inner hob is prolonged.

Referring to fig. 5, in the embodiment, the arc surface at the cutting edge 210 is an arc surface, wherein the radius of the arc surface is R, and R is greater than or equal to 0.05mm and less than or equal to 0.1mm.

Prescribe a limit to in the above-mentioned parameter range through the cambered surface with blade 210 department, on the one hand, can avoid reducing because of the blade 210 sharpness that blade 210 cambered surface radius too big leads to, on the other hand can also avoid leading to preventing collapsing the not obvious condition of sword effect because of blade 210 cambered surface radius undersize. That is to say, the arrangement can prevent the knife from collapsing and ensure the cutting effect on the pipe fitting 010.

In a specific embodiment, R =0.05mm.

Referring to fig. 5, in the present embodiment, an included angle between the plane of the inner edge 230 and the outer side surface 220 is θ, wherein θ is greater than or equal to 8 ° and less than or equal to 12 °.

By limiting the included angle theta between the plane of the inner blade 230 and the outer side 220 within the above parameter range, on one hand, the strength of the blade 200 and the connection strength between the blade 200 and the hob body 100 are prevented from being reduced due to the over-small theta, and on the other hand, the waste of the material of the blade 200 due to the over-large theta is also prevented, so that the cost of the hob in the embodiment is saved.

Preferably, in the present embodiment, θ =10 °.

Fig. 7 is a left side view of the inner hob of fig. 3. As shown in fig. 7, the outer circumferential surface 120 of the hob body 100 is provided with a mounting portion 130, wherein the mounting portion 130 is configured to be fixedly connected with the apparatus main body of the pipe bending apparatus.

When the pipe 010 needs to be cut by the inner hob, the inner hob can be fixedly connected with the equipment main body of the pipe bending equipment through the installation part 130 arranged on the outer peripheral surface 120 of the hob body 100, so that the inner hob can be driven to rotate through the equipment main body, the purpose that the inner hob rotates eccentrically relative to the center of the pipe 010 is achieved, and the pipe 010 is cut.

The reliable connection of the inner hob and the equipment main body of the pipe bending equipment can be ensured by the arrangement of the installation part 130, so that the reliability of cutting of the pipe fitting 010 is ensured.

Referring to fig. 7, in the present embodiment, the mounting portions 130 include two planes disposed on the outer circumferential surface 120 of the hob body 100, the two mounting portions 130 are symmetrically disposed on two sides of the hob body 100, that is: symmetrical planes are arranged on two sides of the hob body 100, and the two planes are parallel to each other.

When the inner hob is required to be fixedly arranged on the equipment main body, a group of relative set screws can be arranged on the equipment main body, so that the inner hob is positioned between the set of set screws, the length of the set screws extending into the hob body 100 is adjustable, and the inner hob is fixed relative to the equipment main body by utilizing the abutting of the set screws and the mounting part 130.

In this embodiment, the inner roller cutter is made of ASP30. The arrangement ensures that the inner hob has good grinding performance and good wear resistance, so that the service life of the inner hob is prolonged, and the maintenance frequency of the inner hob is reduced.

It should be noted that ASP30 is a high-cobalt, high-vanadium high-grade high-alloy high-speed steel manufactured by a powder metallurgy ASP process, which is obtained by atomizing metal powder, compacting, and then hot forming to a desired size, and has a uniform structure so that it has good overall properties.

In particular, in this embodiment, the outer surface of the inner roller cutter is provided with a DLC coating. The inner hob cutter is high in hardness and abrasion resistance due to the arrangement, and the service life of the inner hob cutter can be greatly prolonged.

In the embodiment, the thickness of the DLC coating is B, wherein B is more than or equal to 5 mu m and less than or equal to 10 mu m.

By limiting the thickness of the DLC coating within the above range, on one hand, the limited service life of the inner hob caused by the excessively thin DLC coating can be avoided, and on the other hand, the material waste caused by the excessively thick DLC coating can be avoided, so that the manufacturing cost of the inner hob is reduced.

In addition, the present embodiment also provides a pipe bending apparatus, which includes an apparatus main body and the above inner hob, specifically, the inner hob is fixedly connected to the apparatus main body through the outer peripheral surface 120, wherein the apparatus main body can drive the inner hob to perform an eccentric rotation motion with respect to the center of the pipe 010.

By providing the inner hob in the pipe bending apparatus, when the pipe 010 needs to be cut, the apparatus main body of the pipe bending apparatus drives the inner hob to perform eccentric rotation with respect to the center of the pipe 010, and the pipe 010 is cut off by the pressure applied to the pipe 010 by the cutting edge 210. Accordingly, the pipe bending equipment has all the advantages of the inner hob and is not described in detail.

In this embodiment, the pipe bending apparatus may be a chipless small U-shaped pipe bending machine or a high-speed long U-shaped pipe bending machine.

It should be noted that, the specific structure of the pipe bending apparatus and how to drive the inner hob to perform the eccentric rotation motion are available for those skilled in the art according to the prior art, and this embodiment does not improve this, and therefore, detailed description is omitted.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

In the above embodiments, the descriptions of the orientations such as "upper", "lower", "side", and the like are based on the drawings.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to 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 (10)

1. The inner hob is characterized by comprising a hob body (100) and a cutting edge (200), wherein the hob body (100) is annular, the cutting edge (200) is arranged on the inner circumferential surface (110) of the hob body (100), and the cutting edge (200) is arranged in a whole circle along the inner circumferential surface (110) of the hob body (100); the cutting edge (200) comprises a cutting edge (210), an outer side surface (220) and an inner edge (230), wherein the outer side surface (220) and the inner edge (230) are respectively arranged on two sides of the cutting edge (210), the outer side surface (220) is parallel to a radial plane of the hob body (100), and a plane where the inner edge (230) is located and the outer side surface (220) form an angle and are intersected to form the cutting edge (210).

2. The inner roller cutter according to claim 1, wherein the cutting edge (210) is a convex arc surface.

3. The inner hob according to claim 2, characterized in that the arc surface is a circular arc surface with a radius R, wherein R is greater than or equal to 0.05mm and less than or equal to 0.1mm.

4. The inner roller cutter according to claim 1, characterized in that the angle between the plane of the inner edge (230) and the outer side surface (220) is θ, wherein θ is larger than 8 ° and smaller than 12 °.

5. The inner hob according to claim 1, characterized in, that the hob body (100) is of one piece construction with the cutting edge (200).

6. The inner hob according to claim 1, characterized in, that the outer circumferential surface (120) of the hob body (100) is provided with a mounting portion (130), the mounting portion (130) being configured to be fixedly connected with an apparatus body of a pipe bending apparatus.

7. The inner roller cutter according to any of claims 1 to 6, characterized in that the material of the inner roller cutter is ASP30.

8. Inner hob according to any one of claims 1 to 6, characterized in, that the outer surface of the inner hob is provided with a DLC coating.

9. The inner hob according to claim 8, characterized in, that the DLC coating has a thickness B, wherein 5 μm B10 μm.

10. A pipe bending apparatus, comprising an apparatus body and an inner hob according to any one of claims 1 to 9, said inner hob being fixedly connected to said apparatus body by means of an outer circumferential surface (120), said apparatus body being capable of driving said inner hob to perform an eccentric rotational movement with respect to the center of a pipe (010).

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