CN220497799U - Boring cutter and boring machine - Google Patents

Abstract

The utility model relates to the technical field of tool manufacture, in particular to a boring cutter and a boring machine. According to the boring cutter disclosed by the utility model, the skeleton oil seal is arranged between one end of the second part and one end opposite to the inner rolling sleeve, the rigidity of the oil film of the skeleton oil seal enables the oil film and the air contact end to form a crescent face, so that the leakage of a working medium is prevented, the sealing of a rotating shaft is realized, the skeleton oil seal has a simple structure and a good sealing effect, is suitable for high-speed rotation, and can better prevent water, oil and dust and protect a bearing.

Description

Boring cutter and boring machine

Technical Field

The utility model relates to the technical field of cutter manufacturing, in particular to a boring cutter and a boring machine.

Background

The cam shaft hole line boring cutter is a core cutter for processing an engine cylinder block. The high-end machine tool is mostly processed by adopting an internal cooling internal rolling type linear boring cutter, and the structural form and the precision of the boring cutter directly influence the processing precision and the surface quality of the camshaft hole. The spindle part of the common structure of the linear boring cutter is easy to wear, the manufacturability of connecting parts is poor, and the internal cooling liquid is in risk of leakage.

Disclosure of Invention

The utility model aims to at least solve the problem that the cooling liquid in the boring bar is easy to leak. The aim is achieved by the following technical scheme:

a first aspect of the present utility model provides a boring tool comprising:

the first boring bar comprises a first part, a second part and a third part in sequence;

a second boring bar detachably connected to the first portion;

an inner roller sleeve sleeved outside the second part;

the two framework oil seals are respectively arranged between the second part and the inner rolling sleeve, and are arranged at intervals along the axial direction of the second part;

the bearing is sleeved between the second part and the inner rolling sleeve, and the bearing is arranged between the two framework oil seals.

According to the boring cutter disclosed by the utility model, the skeleton oil seal is arranged between one end of the second part of the first boring bar and the inner rolling sleeve, the rigidity of the oil film of the skeleton oil seal just enables the oil film and the air contact end to form a crescent surface (the crescent surface is formed under the action of the tension of the liquid surface), and the leakage of a working medium is prevented, so that the sealing of a rotating shaft is realized, the skeleton oil seal has a simple structure and a good sealing effect, is suitable for high-speed rotation, and can better prevent water, oil and dust and protect a bearing.

In addition, the boring cutter according to the utility model may also have the following additional technical features:

in some embodiments of the utility model, the bearing is an angular contact ball bearing.

In some embodiments of the utility model, the first boring bar includes a first conduit extending through the first boring bar along an axis of the first boring bar, the second boring bar includes a second conduit extending through the second boring bar along an axis of the second boring bar, and the first conduit communicates with the second conduit.

In some embodiments of the utility model, the boring tool further comprises a hollow pin through which the first conduit communicates with the second conduit.

In some embodiments of the present utility model, the boring tool further includes a positioning pin, a pin groove is formed on a circumferential side wall of the first portion, a pin hole matched with the pin groove is formed on a circumferential side wall of the second boring bar, and the positioning pin is respectively in plug-in fit with the pin groove and the pin hole.

In some embodiments of the present utility model, a screw hole communicated with the pin hole is formed in the circumferential side wall of the second boring bar, and a set screw is screwed in the screw hole and used for fastening the positioning pin.

In some embodiments of the utility model, the skeletal oil seal is a TC skeletal oil seal.

In some embodiments of the present utility model, the boring tool further includes a connecting member, a first through hole is formed in a circumferential side wall of the first portion, a second through hole matched with the first through hole is formed in a circumferential side wall of the second boring bar, and the connecting member is respectively detachably matched with the first through hole and the second through hole.

In some embodiments of the utility model, a spacer is also included, the spacer being disposed between the second portion and the inner roller.

The second aspect of the utility model provides a boring machine comprising the boring cutter.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically illustrates a schematic structural view of a boring machine according to an embodiment of the present utility model;

FIG. 2 schematically illustrates a cross-section of a first plane of a boring tool according to an embodiment of the utility model;

FIG. 3 schematically illustrates a cross-section of a second plane of a boring tool according to an embodiment of the utility model;

FIG. 4 is a cross-sectional view taken along the A-A plane in FIG. 3;

fig. 5 is a schematic structural view schematically showing a skeleton oil seal according to an embodiment of the present utility model.

The reference numerals are as follows:

100. boring cutter;

10. a first boring bar; 11. a first section; 12. a second section; 13. a third section; 14. a first conduit;

20. a second boring bar; 21. a second conduit; 30. an inner roller sleeve; 40. boring head;

50. a hollow pin; 60. a spacer bush; 70. angular contact ball bearings;

80. a framework oil seal; 81. an outer layer; 82. a metal skeleton; 83. a spring;

90. a connecting piece; 91. an outer cone end screw; 92. a slide pin; 93. an inner cone end screw;

101. a positioning pin; 1011. a set screw;

200. boring die support; 300. boring die.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

As shown in fig. 1 to 5, according to an embodiment of the present utility model, a boring tool 100 is provided, and the boring tool 100 includes a first boring bar 10, a second boring bar 20, an inner roller 30, two frame oil seals 80, and bearings. The first boring bar 10 includes a first portion 11, a second portion 12 and a third portion 13, the second boring bar 20 is detachably connected to the first portion 11, the inner roller 30 is sleeved on the outer side of the second portion 12, two skeleton oil seals 80 are respectively disposed between the second portion 12 and the inner roller 30, along the axial direction of the second portion 12, the two skeleton oil seals 80 are disposed at intervals, a bearing is also sleeved between the second portion 12 and the inner roller 30, and the bearing is disposed between the two skeleton oil seals 80.

According to the boring cutter 100 of the utility model, the framework oil seal 80 is arranged between the second part 12 of the first boring bar 10 and the inner roller sleeve 30, the rigidity of an oil film of the framework oil seal 80 just enables the oil film to form a crescent surface with an air contact end, and leakage of a working medium is prevented, so that sealing of a rotating shaft is realized, and the framework oil seal 80 has a simple structure, good sealing effect, is suitable for high-speed rotation, can better prevent water, oil and dust, and protects a bearing.

Specifically, the two bearings are angular ball bearings 70, and the angular ball bearings 70 are adopted in the present embodiment, and the angular ball bearings 70 can simultaneously receive radial load and axial load. The inner race of the angular contact ball bearing 70 cooperates with the second portion 12 (i.e., the boring tool spindle), and the steel ball does not contact the third portion 13 or the second boring bar 20 (i.e., the boring tool body), so that the boring tool spindle is not easily worn, and the service life of the boring tool 100 can be prolonged.

It is to be understood that the number of the angular ball bearings 70 is two, the two angular ball bearings 70 are disposed between the two frame oil seals 80, one frame oil seal 80 is attached to an end face of one angular ball bearing 70, the other frame oil seal 80 is attached to an end face of the other angular ball bearing 70, and the two angular ball bearings 70 are respectively attached to one frame oil seal 80. That is, the angular ball bearing 70 adopts a double row arrangement, can bear radial and axial combined loads and moment loads mainly with larger radial loads, and limits axial displacement of the shaft in two aspects. And, the double row angular contact ball bearing 70 arrangement has advantages of high speed performance, high rigidity, prolonged fatigue life, convenient installation and compact cross section. The boring cutter 100 has higher rotation precision in the use process, and meets the requirements of high-precision machining and high-speed cutting.

Specifically, the first boring bar 10 includes a first conduit 14, the first conduit 14 penetrates the first boring bar 10 along an axis of the first boring bar 10, the second boring bar 20 includes a second conduit 21, the second conduit 21 penetrates the second boring bar 20 along an axis of the second boring bar 20, and the first conduit 14 and the second conduit 21 are in communication. The first conduit 14 and the second conduit 21 are used for conveying cooling liquid, and the cooling liquid cools down the cutting part. In some embodiments, the first boring bar 10 and the second boring bar 20 may be provided with through holes from the first conduit 14 or the second conduit 21 to the circumferential side wall of the boring bar, and the cooling liquid flows out of the through holes when the boring tool 100 rotates at a high speed, so as to cool the boring tool 100.

It will be appreciated that the boring tool 100 further includes a hollow pin 50, the first conduit 14 communicates with the second conduit 21 through the hollow pin 50, and the hollow pin 50 prevents leakage of coolant fluid to allow communication between the first conduit 14 and the second conduit 21.

In some embodiments, boring tool 100 further includes locating pins 101. The circumferential side wall of the first part 11 is provided with a pin groove, the circumferential side wall of the second boring bar 20 is provided with a pin hole matched with the pin groove, a positioning pin 101 is inserted into the pin groove and the pin hole, and the positioning pin 101 is used for transmitting the torque of the first boring bar 10 and the second boring bar 20 and has a positioning function on the circumferences of the first boring bar 10 and the second boring bar 20. In addition, the positioning pin 101 replaces the positioning mode of the positioning key in the prior art, the connecting part of the second boring bar 20 and the first boring bar 10 is not provided with a positioning key groove, and only a pin groove is required to be machined, so that the machining is simplified. The gap between the pin groove and the positioning pin 101 is small, and the coolant does not penetrate.

Specifically, a screw hole communicated with the pin hole is further formed in the circumferential side wall of the second boring bar 20, and a set screw 1011 is connected in the screw hole in a threaded manner, and the set screw 1011 is used for fastening the positioning pin 101.

Specifically, as shown in fig. 5, the skeleton oil seal 80 is a TC skeleton oil seal 80, and the TC skeleton oil seal 80 is a mechanical element for sealing a liquid medium (including oil, water, etc.) and isolating a part of a transmission member to be lubricated from the external environment so that a cooling liquid does not leak. The characteristics of the TC framework oil seal 80 are well suited for this application scenario of the linear boring tool 100.

It will be appreciated that the TC framework oil seal 80 is a metal framework 82 encased double lip framework oil seal 80 outer layer 81, also referred to as a lip seal, where T represents double lip and C represents outer encased rubber. The main lip of the double-lip framework oil seal 80 is used for oil proofing, and the auxiliary lip is used for dust proofing. The spring 83 serves to tighten the sealing part. The sealing principle is as follows: under the action of the TC framework oil seal 80, the rigidity of the oil film just enables the oil film and the air contact end to form a crescent surface, so that the leakage of a working medium is prevented, and the sealing of the rotating shaft is realized. The TC framework oil seal 80 has the advantages of simple structure, good sealing effect, suitability for high-speed rotation, better water resistance, oil resistance and dust resistance, and bearing protection.

In some embodiments, boring tool 100 further includes a connector 90. The first through hole is formed in the circumferential side wall of the first portion 11, the second through hole matched with the first through hole is formed in the circumferential side wall of the second boring bar 20, the connecting piece 90 is respectively matched with the first through hole and the second through hole in a detachable mode, and the connecting piece 90 is used for enabling the second boring bar 20 to be connected with the first portion 11 in a detachable mode.

Specifically, the connector 90 is a TMG21 standard module. The type and size of the TMG21 tool system is described in GB/T25668, modular boring and milling tool System. The TMG21 standard module includes an outer cone end screw 91, a slide pin 92 and an inner cone end screw 93. The inner cone end screw 93 is partially in the first through hole, and the other part is in the second through hole, and the outer cone end screw 91 is also partially in the first through hole, and the other part is in the second through hole. The first through hole and the second through hole penetrate the junction of the first pipe 14 and the second pipe 21, and then the slide pin 92 communicates with the hollow pin 50, and the cooling liquid flowing out of the hollow pin 50 flows to the cutting site of the boring cutter 100 via the inner taper end screw 93 or the outer taper end screw 91.

It will be appreciated that the TMG21 standard module is formed by the combination of an outer cone end screw 91, a slide pin 92, an inner cone end screw 93, with the axially offset inner and outer cone end screws and slide pin 92, the axial components create double expansion forces, creating greater forces, higher repeated tool changing capability, and low vibration. The TMG21 standard module is used for connecting the first boring bar 10 and the second boring bar 20, and has the advantages of stable precision, reliable connection and convenient replacement. In addition, in the present embodiment, the hollow pin 50 and the TMG21 standard module are mated, and the hollow pin 50 transmits the coolant through the TMG21 standard module without the need to re-process the through hole in the boring bar. More material can be prevented from being removed at the joint of each section of the boring cutter 100, and the risk of fracture at the joint of the spindle of the linear boring cutter 100 is reduced. And the hollow pin 50 is simple to manufacture, and the TMG21 standard module is also a standardized piece, so that the installation is convenient.

In some embodiments, the boring tool 100 further includes a spacer 60, the spacer 60 being disposed between the second portion 12 and the inner roller 30. Specifically, spacer 60 fits tightly against second portion 12, and bearing and frame oil seal 80 are both sleeved on spacer 60. The spacer bush 60 can adjust the play and pre-compression of the bearing, can make the ratio of the inner ring of the bearing uniform, can also protect the bearing from damage, has plenty of space for screwing the nut during installation, and is good for a wrench, and the function of pressing the nut by a flat pad is similar to that of a common nut. On the other hand, the bearing can play a limiting role on the framework oil seal 80, and the bearing is further protected from being worn by the framework oil seal 80.

The boring tool 100 of the present embodiment is mounted on a boring die holder 200, and the boring die holder 200 is provided on a boring die 300 (a machine tool holder for guiding a rod of the boring tool 100 to bore a workpiece).

The boring tool 100 of the present embodiment further includes boring heads 40, and the boring heads 40 are arranged on the first boring bar 10 and the second boring bar 20 at intervals.

It will be appreciated that the present embodiment is not limited to having only the first boring bar 10 and the second boring bar 20, and a plurality of boring bars may be provided according to the number and depth of holes to be bored by the cylinder. The key point of this embodiment is the junction of the first boring bar 10 and the second boring bar 20. For example, one end of the second boring bar 20 is connected to the first boring bar 10, and the other end of the second boring bar 20 has a first portion 11, a second portion 12, and a third portion 13 similar to the first boring bar 10 for connecting to other boring bars.

It will be appreciated that the first portion 11, the second portion 12 and the third portion 13 of the first boring bar 10 are arranged in a boss, the diameter of the first portion 11 is the smallest, the diameters of the first portion 11 and the third portion 13 are gradually increased, and the diameter of the third portion 13 is the same as the diameter of the end of the second boring bar 20 connected with the first boring bar 10.

The present embodiment also provides a boring machine, which comprises the boring cutter 100, the boring die 300 and the boring die bracket 200.

As a preferred example of this embodiment, the boring tool 100 includes a first boring bar 10, a second boring bar 20, an inner roller sleeve 30, two TC frame oil seals 80, two angular ball bearings 70, a locating pin 101, a TMG21 standard module, and a spacer 60.

Specifically, the first boring bar 10 includes a first portion 11, a second portion 12, and a third portion 13 disposed in a boss in order. The second boring bar 20 and the first portion 11 of the first boring bar 10 are detachably connected by a dowel pin 101 and a TMG21 standard module. The first boring bar 10 and the second boring bar 20 have pipes communicating therein, and a hollow pin 50 is provided at the pipe connection of the first boring bar 10 and the second boring bar 20. The sliding pin 92 of the TMG21 standard module communicates with the hollow pin 50. The second part 12 is sequentially sleeved with a spacer bush 60 and an inner rolling bush 30, both ends of the spacer bush 60 and the inner rolling bush 30 are respectively provided with a TC framework oil seal 80 and an angular contact ball bearing 70, wherein the angular contact ball bearing 70 is positioned on the inner side, and the TC framework oil seal 80 is positioned on the outer side.

The present embodiment has the following advantages:

1. the angular contact ball bearings 70 are arranged in double rows in the embodiment, so that the radial and axial combined load and moment load mainly with larger radial load can be borne. Has the advantages of high-speed performance, high rigidity, long fatigue life, convenient installation, compact cross section and the like. And the rotation precision is higher, and the requirements of high-precision machining and high-speed cutting are met. Compared with the thrust ball bearing with a wider size series, the angular contact ball bearing 70 has the advantages that the inner ring is matched with the spindle of the linear boring cutter 100, the steel ball is not contacted with the linear boring cutter 100, the spindle of the linear boring cutter 100 is not easy to wear, and the service life of the linear boring cutter 100 can be prolonged.

2. In this embodiment, a TC framework oil seal 80 is used. The TC framework oil seal 80 has the advantages of simple structure, good sealing effect, suitability for high-speed rotation, better water resistance, oil resistance and dust resistance, and bearing protection. And standardized and serialized, and easy to purchase in the market. The installation size and the installation method are standardized and only need to be executed.

3. The present embodiment employs a TMG21 standard module. The taper end screw assembly is formed by combining an outer taper end screw 91, a sliding pin 92 and an inner taper end screw 93. By axially biasing the cone end screw and slide pin 92, the axial components create a double expansion force, resulting in greater force, higher repeated tool changing capability, and low vibration. The TMG21 standard module is used for connecting each section of linear boring bar, and has reliable connection, stable precision and convenient replacement.

4. In the embodiment, a hollow pin 50 is arranged at the tail end of the boring bar body mandrel, and cooling liquid is conveyed together with cutting liquid at the adjacent two ends of the boring bar. The hollow pin 50 delivers coolant through the TMG21 standard module without the need to re-machine through holes in the boring bar body. More material can be prevented from being removed at the joint of each section of the boring cutter 100, and the risk of fracture at the joint of the spindle of the linear boring cutter 100 is reduced.

5. In the embodiment, the structural form of the positioning pin 101 is adopted to replace positioning keys for positioning, the position of the boring bar and the mandrel connecting hole is not machined with a key groove, and only the hole is machined. The locating pin 101 is matched with the hole, the clearance is small, and the cutting fluid cannot leak. The positioning pin 101 is fixed by a set screw 1011, and the connection is reliable.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A boring tool, comprising:

the first boring bar comprises a first part, a second part and a third part in sequence;

a second boring bar detachably connected to the first portion;

an inner roller sleeve sleeved outside the second part;

the two framework oil seals are respectively arranged between the second part and the inner rolling sleeve, and are arranged at intervals along the axial direction of the second part;

the bearing is sleeved between the second part and the inner rolling sleeve, and the bearing is arranged between the two framework oil seals.

2. The boring tool of claim 1, wherein the bearing is an angular contact ball bearing.

3. The boring tool of claim 1, wherein the first boring bar comprises a first conduit extending through the first boring bar along an axis of the first boring bar, and the second boring bar comprises a second conduit extending through the second boring bar along an axis of the second boring bar, the first conduit communicating with the second conduit.

4. The boring tool of claim 3, further comprising a hollow pin through which the first conduit communicates with the second conduit.

5. The boring tool according to any one of claims 1-4, further comprising a locating pin, wherein a pin slot is formed in a circumferential side wall of the first portion, a pin hole is formed in a circumferential side wall of the second boring bar and is matched with the pin slot, and the locating pin is respectively matched with the pin slot and the pin hole in a plugging manner.

6. The boring tool according to claim 5, wherein a screw hole communicated with the pin hole is formed in the circumferential side wall of the second boring bar, and a set screw is screwed into the screw hole and used for fastening the positioning pin.

7. The boring tool according to any one of claims 1 to 4, wherein the skeleton oil seal is a TC skeleton oil seal.

8. The boring tool according to any one of claims 1-4, further comprising a connector having a first through hole formed in a circumferential side wall of the first portion, a second through hole formed in a circumferential side wall of the second boring bar and engaged with the first through hole, the connector being detachably engaged with the first through hole and the second through hole, respectively.

9. The boring tool according to any one of claims 1 to 4, further comprising a spacer disposed between the second portion and the inner roller.

10. Boring machine, characterized in that it comprises a boring tool according to any one of claims 1-9.