CN114700768B - Transmission box boring equipment - Google Patents

Abstract

The invention provides a boring device for a transmission case body, which belongs to the technical field of transmission case body processing and comprises: a frame; it is characterized by also comprising: the eccentric boring part is arranged on the rack in a sliding manner; the boring supporting part is arranged on the eccentric boring part; the positioning and holding part is arranged on the two feeding sides of the eccentric boring part; the positioning and holding part is positioned to the inner side and the outer side of the shaft hole of the transmission box body along the boring direction, and the eccentric boring part is supported by the boring supporting part to bore the shaft hole along the positioning and holding part. The boring device has the advantages of accurate roundness of the bored hole of the transmission box body, high boring efficiency and the like.

Description

Transmission box boring equipment

Technical Field

The invention relates to the technical field of gearbox body processing, in particular to a boring device for a gearbox body.

Background

The hole boring refers to further processing of forged, cast or drilled holes, and can enlarge the aperture, improve the precision, reduce the surface roughness and better correct the deviation of the original hole axis; in carrying out derailleur box course of working, need install the trompil of gear shaft to the derailleur box and handle, and need carry out bore hole processing to the shaft hole behind the trompil to improve the installation precision to the gear shaft.

Chinese patent CN201921328578.4 discloses a gearbox shell boring device, which comprises a top disc, a side ejector rod, a driving device and a boring device, wherein the two side ejector rods are rotated to tightly push two sides of a gearbox shell by virtue of the top disc, the side ejector rods drive a fluted disc to rotate, a pressure plate tightly pushes the gearbox shell, the gearbox shell is fixed in a positioning groove of a workbench, the driving device drives the workbench to be close to or far away from a tool rest, a large-size gearbox shell stepped hole can be conveniently processed, the unqualified diameter of the stepped hole in the gearbox shell does not need to be recast, the loss of manpower or material resources is reduced, and the production progress and efficiency are not influenced; one end of the tool rest is provided with a first boring cutter, the other end of the tool rest is provided with a second boring cutter, the first boring cutter and the second boring cutter respectively correspond to two machining hole diameters of a stepped hole in the transmission shell, the first boring cutter carries out fine machining on a deep hole, and the second boring cutter carries out fine machining on a shallow hole.

However, in the technical scheme, although the simultaneous boring processing of different apertures can be realized, in the existing boring processing process, when the aperture of the bore is large, a single boring cutter is adopted for eccentric rotation boring processing, and no matter a single boring cutter or a plurality of groups of boring cutters are used for simultaneous processing, due to the influence of gravity of the boring cutter, when horizontal boring processing is performed, the processing position of the boring cutter is deviated, further the roundness of the bore is poor, and tool withdrawal after boring is inconvenient.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a boring device for a transmission box body.

In order to achieve the purpose, the invention provides the following technical scheme:

a transmission case boring apparatus, comprising: a frame; it is characterized by also comprising: the eccentric boring part is arranged on the frame in a sliding manner; the boring supporting part is arranged on the eccentric boring part; the positioning and holding part is arranged on the two feeding sides of the eccentric boring part; the positioning and holding part is positioned to the inner side and the outer side of the shaft hole of the transmission box body along the boring direction, and the eccentric boring part is supported by the boring supporting part to bore the shaft hole along the positioning and holding part.

Furthermore, the eccentric boring part is subjected to boring switching after primary boring, so that the boring supporting part is kept on the surface of the primary boring and is withdrawn from the shaft hole.

Further, the bore hole support portion includes: a guide seat movably mounted on the positioning and holding part; and the top contact assemblies are symmetrically arranged on the guide seat; the power end of the eccentric boring part is arranged on the guide seat; the top contact assembly rotates along with the eccentric boring part and moves from the positioning and holding part to the inner wall of the bored shaft hole to guide the eccentric boring part in a rotating way.

Further, the top-contacting assembly comprises: the top contact roller is arranged on the guide seat; and a scraping cover surrounding the outside of the top touch roller; one side of the scraping cover is provided with an opening corresponding to the positioning and holding part and the inner wall of the shaft hole; the top-contact roller penetrates through the opening and is fed to the inner wall of the shaft hole from the positioning and holding part in a rotating mode, and the scraping cover cleans the positioning and holding part and the inner wall of the shaft hole along the rotating path.

Further, the positioning and holding portion includes: the power bracket is arranged on the eccentric boring part; the first holding assembly is arranged on the power bracket; a second holding member disposed on one side of the first holding member; and a tension assembly mounted on the power bracket; the tensioning assembly drives the second holding assembly in a furled state to penetrate through the shaft hole, the first holding assembly is pressed and held on the outer edge part of the shaft hole, and the tensioning assembly pulls back the expanded second holding assembly to be pressed and held on the inner edge part of the shaft hole.

Further, the first retaining assembly comprises: positioning the cylinder; the connecting bracket is used for mounting the positioning cylinder on the power bracket; and the power end of the eccentric boring part movably penetrates through the connecting bracket.

Further, the second holding member includes: circumferentially arranged holddowns; the retractable power part is arranged on the power end of the tensioning assembly, and the power end of the retractable power part is connected with the pressing and holding part; the power piece is retracted and released, so that the pressing and holding piece is folded into the space of the shaft hole, and the clamping piece is opened to the edge of the shaft hole.

Further, the tension assembly includes: tensioning the power piece; and a guide member mounted on the power end of the tensioning power member; the guide seat is arranged on the guide piece in a sliding mode.

Further, the eccentric boring part includes: a drive assembly mounted on the frame; the rotating part is eccentrically arranged on the power end of the driving assembly; and a switching cutter mounted on the rotary member; the driving component drives the rotating piece supported by the boring supporting part to rotate, and simultaneously, the switching cutter piece is fed into the shaft hole.

Further, the switching insert includes: a tool apron; a cutter mounted on the holder; the switching power assembly drives the cutter to perform boring switching; and the switching power assembly switches the cutter after the primary boring to a boring returning state.

The invention has the beneficial effects that:

(1) According to the invention, through the mutual matching between the eccentric boring part and the boring supporting part, when the eccentric boring part conducts boring treatment on the shaft hole, the switching cutter piece eccentrically rotating on the eccentric boring part is supported by the boring supporting part, so that the lateral deviation caused by the action of gravity and the like in the rotating process of the switching cutter piece can be solved, and the boring roundness of the shaft hole by the eccentric boring part is ensured;

(2) According to the invention, through the mutual matching between the boring supporting part and the positioning and holding part, the positioning and holding part clamps the inner side and the outer side of the shaft hole in advance, so that the boring supporting part can be used for boring and supporting the eccentric boring part by taking the inner wall of the positioning and holding part as a boring supporting reference, when the eccentric boring part enters the shaft hole, the subsequent boring treatment is supported by taking the inner wall of the shaft hole after the boring treatment as a reference, and the feeding direction of the boring supporting part is guided by the positioning and holding parts clamped on the two sides of the shaft hole, so that the accuracy in feeding along the depth direction of the shaft hole during boring can be improved;

(3) According to the invention, through the matching between the boring supporting part and the switching cutter piece, after the switching cutter piece enters from the outside of the shaft hole and primary boring is finished, the switching cutter piece completes the switching of the cutter piece on the inner side of the shaft hole and returns to finish fine boring by utilizing the feedback of the boring supporting part on the inner wall of the shaft hole after roundness treatment and the inner wall of the positioning and maintaining part, so that secondary fine boring treatment when the cutter piece pushes out the boring hole is realized;

(4) According to the invention, through the matching between the top-touch roller and the scraping cover, the waste on the motion path of the top-touch roller can be cleaned by the scraping cover in the process of supporting the cutter-changing piece by utilizing top-touch rolling, so that the influence of the waste on the positioning of the top-touch roller in the positioning and holding part and the inner wall of the shaft hole is solved;

(5) According to the boring device, the first retaining assembly, the second retaining assembly and the top contact assembly are matched, after the first retaining assembly and the second retaining assembly are tightened on the edge portions of the inner side and the outer side of the shaft hole, the top contact assembly moves along the guide piece on the tightening assembly between the first retaining assembly and the second retaining assembly, and therefore the top contact assembly can move along the guide rod which is accurately positioned, and accuracy of a boring feeding direction is guaranteed;

in conclusion, the boring device has the advantages of being accurate in boring roundness of the transmission box body, high in boring efficiency and the like.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the eccentric boring section according to the present invention;

FIG. 3 is a schematic view of the positioning and retaining part of the present invention;

FIG. 4 is a cross-sectional view F-F of FIG. 3 according to the present invention;

FIG. 5 is a schematic structural view of a bore support of the present invention;

FIG. 6 is a schematic view of a switching insert according to the present invention;

FIG. 7 is a cross-sectional view of the invention of FIG. 6;

FIG. 8 is an enlarged view taken at A of FIG. 7 in accordance with the present invention;

FIG. 9 is a schematic structural view of a second retaining assembly of the present invention;

fig. 10 is a schematic structural view of the fixing member of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example one

As shown in fig. 1, a transmission case boring apparatus includes: a frame 1; further comprising:

the eccentric boring part 2 is arranged on the frame 1 in a sliding manner;

the boring supporting part 3 is installed on the eccentric boring part 2; and

positioning and holding parts 4, wherein the positioning and holding parts 4 are arranged on the two feeding sides of the eccentric boring part 2;

the positioning and maintaining part 4 is positioned to the inner side and the outer side of a shaft hole of the transmission box body along the boring direction, and the boring supporting part 3 supports the eccentric boring part 2 to bore the shaft hole along the positioning and maintaining part 4.

Through the above, it is not difficult to find that, when the transmission case is used for boring the shaft hole, the transmission case is heavy and the size of the processed shaft hole is large, so that the shaft hole is usually bored by adopting a horizontal eccentric boring method, and when the horizontal boring method is used, the boring tool is subjected to the action of gravity and the like, so that the boring tool cannot accurately bore the shaft hole according to a preset eccentric rotation track, and cannot be moved and positioned when the shaft hole is fed, so that the central axis of the shaft hole deviates.

In the invention, after the eccentric boring part 2 moves to one side of a shaft hole of a transmission box body to be processed on the frame 1 to perform center calibration, the positioning and holding part 4 moves to the inner side surface and the outer side surface of the shaft hole to position and hold the shaft hole, and the boring supporting part 3 can perform boring supporting on the eccentric boring part 2 in the boring process of the eccentric boring part 2, so that the boring process is controlled to be performed within a preset roundness, and when the boring supporting part 3 and the eccentric boring part 2 feed towards the shaft hole, the boring is performed along the boring direction held by the positioning and holding part 4, thereby ensuring the accuracy of the eccentric boring part 2 in boring along the feeding direction of the shaft hole.

Furthermore, the eccentric boring part 2 is switched to boring after primary boring, so that the boring supporting part 3 is kept on the surface of the primary boring and is withdrawn from the shaft hole.

In this embodiment, when the eccentric boring section 2 moves in the boring direction held by the positioning holding section 4 under the holding action of the boring holding section 3, and when the eccentric boring section 2 bores a hole from the edge of the shaft hole toward the shaft hole, the boring holding section 3 holds the eccentric boring section 2 on the positioning holding section 4 in the rotating direction, and after the eccentric boring section 2 gradually bores the hole into the shaft hole, the boring holding section 3 also enters the shaft hole along with the eccentric boring section 2, and the boring holding section 3 also positions and holds the subsequent boring process with the surface of the shaft hole already bored by the eccentric boring section 2 as a reference, and when the eccentric boring section 2 bores from one side of the shaft hole to the other side, that is, after one boring is completed, the eccentric boring section 2 switches the boring reference, and performs the final boring process again when exiting from the shaft hole, and when finishing the boring process, the holding section 3 moves from the surface of the shaft hole of one boring to the positioning holding section 4 until the complete boring is completed, and the precision boring operation can be performed twice continuously.

It should be added that, as shown in fig. 1 and 10, the fixing assembly 5 for installing the transmission case is further included, and the fixing assembly 5 includes a base 51, a bottom support 52 disposed above the base 51, a pushing and lifting motor 53 installed on the base 51 and having a power end connected with the bottom support 52, a guide post 54 disposed on the bottom support 52 and movably inserted on the base 51, and a clamp 55 disposed on the bottom support 52.

In the present embodiment, the height adjustment of the center of the shaft hole of the transmission case is achieved by mounting the transmission case on the bottom bracket 52 using the jig 55, and by allowing the bottom bracket 52 to move up and down by the power action of the push-up motor 53, preferably a push-rod motor, on the base 51.

As shown in fig. 3, the bore supporter 3 includes:

a guide holder 31 movably mounted on the positioning and holding portion 4; and

a top contact assembly 32 symmetrically arranged on the guide seat 31;

the power end of the eccentric boring part 2 is arranged on the guide seat 31;

the abutting member 32 follows the rotation of the eccentric boring section 2, and moves from the positioning and holding section 4 to the inner wall of the bored shaft hole, thereby guiding the rotation of the eccentric boring section 2.

In this embodiment, when the boring supporting portion 3 guides the eccentric boring portion 2 by boring, the guide seat 31 is disposed on the positioning and holding portion 4 to guide the eccentric boring portion 2 in a moving manner during feeding, so as to better ensure the accuracy of boring along the depth direction of the shaft hole by the eccentric boring portion 2, and in the process of boring by rotating the eccentric boring portion 2, the top contact component 32 also rotates along with the eccentric boring portion 2, and the top contact component 32 always abuts against the positioning and holding portion 4 or the inner wall of the shaft hole after boring, so as to rotationally position the eccentric boring portion 2 in the boring process, thereby ensuring the roundness and the accuracy of the position during boring.

As shown in fig. 5, the top touch assembly 32 includes:

a knock roller 321 mounted on the guide holder 31; and

a wiping cover 322 surrounding the outside of the knock roller 321;

an opening 3221 corresponding to the positioning and holding part 4 and the inner wall of the shaft hole is formed in one side of the scraping cover 322;

the knock roller 321 is rotatably fed from the aligning holder 4 to the shaft hole inner wall through the opening 3221, and the wiper cover 322 cleans the aligning holder 4 and the shaft hole inner wall along the rotation path.

In this embodiment, when the top-contacting component 32 performs boring positioning on the eccentric boring part 2 continuing the boring operation according to the inner wall path of the positioning and holding part 4 and the inner wall of the bored shaft hole, the top-contacting roller 321 rotates along with the rotation of the eccentric boring part 2 on the inner wall of the positioning and holding part 4 to position and support a possible boring track deviation condition of the eccentric boring part 2, and the scraping cover 322 also rotates along with the top-contacting roller 321 outside the top-contacting roller 321 to clean up waste materials occurring in the boring process, so as to avoid the waste materials from influencing the direct contact between the top-contacting roller 321 and the inner wall path of the positioning and holding part 4 and the inner wall of the bored shaft hole to influence the boring holding precision.

As shown in fig. 2, the positioning and holding portion 4 includes:

a power bracket 41 mounted on the eccentric boring section 2;

a first holding member 42 provided on the power bracket 41;

a second holding member 43 disposed on one side of the first holding member 42; and

a tension assembly 44 mounted on the power bracket 41;

the tensioning assembly 44 drives the second holding assembly 43 in the folded state to pass through the shaft hole, the first holding assembly 42 is pressed and held on the outer edge part of the shaft hole, and the tensioning assembly 44 pulls back the expanded second holding assembly 43 to be pressed and held on the inner edge part of the shaft hole.

In the embodiment, during the process of positioning and clamping the shaft hole by the positioning and holding part 4, the power bracket 41 and the first holding component 42 are driven to move to the outside of the shaft hole by the power action of a hydraulic push rod (not shown in the figure) preferably installed on the frame 1, and when the first holding component 42 moves to the outside wall of the shaft hole and is pressed, the contracted second holding component 43 enters the shaft hole space, and the tensioning component 44 drives the second holding component 43 to move towards the inside of the shaft hole until reaching the inside of the shaft hole, after reaching the inside of the shaft hole, the second holding component 43 is opened, and the tensioning component 44 drives the second holding component 43 to be tensioned on the inner side part of the shaft hole, so that the eccentric boring part 2 is guided to move along the feeding direction by the shaft hole by the first holding component 42 and the second holding component 43, and the eccentric boring part 2 is prevented from deviating from the central axis of the shaft hole during boring.

As shown in fig. 3, the first holding member 42 includes:

a positioning cylinder 421; and

a connecting bracket 422 for mounting the positioning cylinder 421 on the power bracket 41;

the power end of the eccentric boring part 2 movably passes through the connecting bracket 422.

In this embodiment, when the first holding member 42 presses and holds the outer sidewall of the shaft hole, the power bracket 41 pushes the connecting bracket 422, so that the positioning cylinder 421 is pressed against the outer sidewall of the shaft hole, and the power end of the eccentric boring part 2 also passes through the connecting bracket 422, and when the eccentric boring part 2 performs a boring operation, the connecting bracket 422 is also driven to rotate between the positioning cylinder 421 and the power bracket 41.

Additionally, a groove 4211 is formed on the side wall of the positioning cylinder 421.

In this embodiment, the groove 4211 provided in the positioning cylinder 421 prevents the edge of the shaft hole from being completely finish-bored when the eccentric boring section 2 is returned to the primary boring process.

As shown in fig. 9, the second holding member 43 includes:

circumferentially arranged holddowns 431; and

a retracting power part 432 which is arranged on the power end of the tensioning component 44 and the power end of which is connected with the pressing and holding part 431;

the power member 432 is retracted to draw the holding member 431 into the shaft hole space and open the holding member 431 to the shaft hole edge.

In this embodiment, when the second holding unit 43 enters the shaft hole space, the retraction power member 432, preferably a hydraulic push rod, drives the holding member 431 to retract to a side close to the retraction power member 432, so as to enter the shaft hole space, and after the first holding unit 42 is positioned, the tensioning unit 44 drives the retraction power member 432 and the holding member 431 to move to the inner side of the shaft hole, the retraction power member 432 drives the holding member 431 to open, and the tensioning unit 44 tensions the holding member 431 on the inner edge portion of the shaft hole.

As shown in fig. 3, the take-up assembly 44 includes:

the power member 441 is tensioned; and

a guide 442 mounted on the power end of the tensioning power member 441;

the guide seat 31 is slidably disposed on the guide 442.

In this embodiment, when the tightening unit 44 tightens the second holding unit 43 on the inner edge of the shaft hole, the tightening power member 441, preferably a hydraulic push rod, pulls the guide 442, so that the guide 442 pulls the second holding unit 43 to move toward the first holding unit 42 side and the second holding unit 43 is pressed against the inner edge of the shaft hole.

Example two

As shown in fig. 2 and 3, in which the same or corresponding components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that:

the eccentric boring section 2 includes:

a drive assembly 21 mounted on the frame 1;

a rotating member 22 eccentrically disposed on a power end of the driving unit 21; and

a switching cutter 23 mounted on the rotary member 22;

the drive assembly 21 drives the rotation member 22 held by the bore holding section 3 to rotate while feeding the switching cutter 23 into the shaft hole.

In this embodiment, when the eccentric boring assembly 2 bores a shaft hole, the driving assembly 21 can feed the rotating member 22 and the switching tool 23 mounted on the rotating member 22 toward the shaft hole, and at the same time, the rotating member 22 and the switching tool 23 can be driven to rotate around the central axis of the shaft hole, so as to bore the shaft hole.

It should be added that, as shown in fig. 2, the driving assembly 21 includes a rotation driving motor 211 for driving the rotation member 22 to rotate eccentrically and a feed driving member 212 for driving the rotation member 22 to move toward the shaft hole side.

Further, the feeding driving member 212 includes a driving screw 2121 installed on the frame 1 and threadedly connected to the rotation driving motor 211, and a feeding driving motor 2122 installed at one side of the frame 1 and dynamically connected to the driving screw 2121.

In this embodiment, the driving screw 2121 is rotated by the driving motor 2122, preferably a servo motor, so that the rotary driving motor 211 is driven to feed the switching tool 23 in the axial hole direction, and the inner wall of the axial hole can be bored.

As shown in fig. 6 and 7, the switching insert 23 includes:

a tool holder 231;

an insert 232 mounted on the holder 231; and

a switching power assembly 233 for driving the cutter 232 to switch boring;

the switching power assembly 233 switches the once-bored insert 232 to a return boring state.

In this embodiment, after the switching tool 23 completes one boring toward the inner side of the shaft hole, the switching power assembly 233 on the tool holder 231 drives the tool 232 to switch, so that the fine boring process is performed when the switched tool 232 returns.

It should be added that, as shown in fig. 7, two sets of knife elements 232 are sequentially arranged, and the switching power element 233 comprises a first supporting top 2331 inserted into the knife seat 231 and arranged on the top of the knife element 232, a second supporting top 2332 inserted into the middle of the knife element 232, a driving screw 2333 in threaded connection with the first supporting top 2331 and the second supporting top 2332, and a driving assembly 2334 for driving the driving screw 2333 to rotate synchronously.

In this embodiment, the transmission screw 2333 is driven by the transmission assembly 2334 to rotate synchronously, so that the first supporting and ejecting member 2331 and the second supporting and ejecting member 2332 perform supporting and ejecting treatment on the top and the middle of the cutter 232, so that one group of the cutter 232 is extended for treatment during one boring, and the other group of the cutter 232 is driven to extend for fine boring during the return fine boring.

It is also necessary to supplement that the first propping member 2331 is provided with withdrawing slot bodies 23311 respectively corresponding to the knife elements 232; the second knock-up members 2332 are provided with knock-up protrusions 23321 corresponding to the knives 232, respectively.

In this embodiment, when the first and second propping members 2331 and 2332 are moved synchronously, the knife 232 in the used state is at the top away from the retraction slot 23311 and at the bottom away from the propping up protrusion 23321, thus being in the protruding state, while the other set of knife 232 is not in use, the top is in the retraction slot 23311 and the middle is on the propping up protrusion 23321, so that the knife 232 in the retraction slot 23311 and the propping up protrusion 23321 is extended when the first and second propping members 2331 and 2332 are moved, and the extended knife 232 enters the retraction slot 23311 and the propping up protrusion 23321.

It is worth to say that the transmission assembly 2334 includes a transmission disc 23341 connected to the transmission screw rod 2333, a driving disc 23342 in belt transmission with the transmission disc 23341, and a transmission motor 23343 mounted on the tool apron 231 and having a power end connected to the driving disc 23342, wherein the transmission disc 23341 is connected through belt transmission.

In this embodiment, the power end of the transmission motor 23342, preferably a forward and reverse rotation motor, is output to the driving disc 23342 to rotate, and then is transmitted to the driving disc 23341 to rotate through a belt, so as to drive the transmission screw rod 2333 to enable the first support top 2331 and the second support top 2332 to move synchronously.

The working steps are as follows:

step one, installing a transmission box body, namely installing the transmission box body on a fixing component 5 and adjusting the fixing component 5 to enable the central axis of a shaft hole of the transmission box body to correspond to the center of an eccentric boring hole of an eccentric boring part 2;

step two, shaft hole positioning, wherein the power support 41 drives the positioning cylinder 421 to reach the outer edge part of the shaft hole to be compressed, the second holding assembly 43 enters the shaft hole in a contraction state, the tensioning assembly 44 drives the second holding assembly 43 in the contraction state to pass through the shaft hole to reach the inside of the transmission box body, then the power part 432 is retracted to drive the pressing part 431 to be opened, so that the pressing part 431 reaches the inner edge part of the shaft hole, the tensioning assembly 44 works again, and the opened pressing part 431 is compressed at the inner edge part of the shaft hole;

step three, boring the shaft hole, wherein the driving assembly 21 drives the rotating part 22 to eccentrically rotate, so that the eccentrically-rotated switching tool bit 23 is contacted with the inner wall of the shaft hole to be bored, and the driving assembly 21 also drives the switching tool bit 23 to feed towards the depth direction of the shaft hole to be bored for one time;

step four, boring and supporting, wherein when the switching tool bit 23 is subjected to primary fine boring and in the process of conveniently entering the shaft hole from the shaft hole, the guide seat 31 guided by the guide piece 442 on the tensioning assembly 44 is subjected to boring and guiding along the central axis direction of the shaft hole, and the top contact assembly 32 is circumferentially arranged on the positioning cylinder 421, so that when the switching tool bit 23 rotates, the top contact assembly 32 supports the switching tool bit 23, the boring work is carried out by taking the roundness of the inner wall of the positioning cylinder 421 as a reference, and after the switching tool bit enters the shaft hole, the top contact assembly 32 moves to the shaft hole subjected to the roundness processing of the primary boring along with the switching tool bit 23, and the inner wall roundness after the primary fine boring is taken as the reference to realize supporting for subsequent boring processing;

step five, returning to fine boring, wherein after the primary fine boring is finished and the shifting cutter 23 in the transmission box body is reached for switching the cutters, and when the shaft hole is pushed out after the shifting, the top contact assembly 32 continues to finish secondary fine boring treatment by taking the inner wall of the shaft hole of the primary boring as a reference;

and step six, the cutter is withdrawn, after the cutter 23 is switched to carry out secondary fine boring treatment, the second holding component 43 is kept in a contraction state, and the power bracket 41 drives the first holding component 42 and the second holding component 43 to withdraw from the shaft holes, so that boring is finished.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A transmission case boring apparatus, comprising: a frame (1); it is characterized by also comprising:

the eccentric boring part (2), the eccentric boring part (2) is arranged on the frame (1) in a sliding manner;

the boring supporting part (3), the boring supporting part (3) is installed on the eccentric boring part (2); and

positioning and holding parts (4), wherein the positioning and holding parts (4) are arranged on the two feeding sides of the eccentric boring part (2);

the positioning and maintaining part (4) is positioned to the inner side and the outer side of a shaft hole of the transmission box body along the boring direction, and the boring supporting part (3) supports the eccentric boring part (2) to bore on the shaft hole along the positioning and maintaining part (4);

the eccentric boring part (2) performs boring switching after primary boring, so that the boring supporting part (3) is kept on the surface of the primary boring and is withdrawn from the shaft hole;

the bore supporting portion (3) includes:

a guide seat (31) movably mounted on the positioning and holding part (4); and

a top contact assembly (32) symmetrically arranged on the guide seat (31);

the power end of the eccentric boring part (2) is arranged on the guide seat (31);

the top contact component (32) rotates along with the eccentric boring part (2), moves from the positioning and holding part (4) to the inner wall of the bored shaft hole, and rotationally guides the eccentric boring part (2);

the top touch assembly (32) comprises:

a top contact roller (321) arranged on the guide seat (31); and

a wiping cover (322) surrounding the outside of the knock roller (321);

an opening (3221) corresponding to the positioning and holding part (4) and the inner wall of the shaft hole is formed in one side of the scraping cover (322);

the top touch roller (321) passes through the opening (3221) and is rotationally fed to the inner wall of the shaft hole from the positioning and holding part (4), and the scraping cover (322) cleans the positioning and holding part (4) and the inner wall of the shaft hole along a rotating path.

2. A transmission case boring apparatus as claimed in claim 1, characterised in that the locating and retaining portion (4) comprises:

a power bracket (41) penetrating the eccentric boring part (2);

a first retaining assembly (42) provided on the power bracket (41);

a second holding member (43) arranged on one side of the first holding member (42); and

a tension assembly (44) mounted on the power bracket (41);

the tensioning assembly (44) drives the second holding assembly (43) in a furled state to penetrate through the shaft hole, the first holding assembly (42) is pressed and held on the outer edge part of the shaft hole, and the tensioning assembly (44) pulls back the second holding assembly (43) which is expanded and is pressed and held on the inner edge part of the shaft hole.

3. A transmission housing boring apparatus as set forth in claim 2 wherein said first retaining assembly (42) includes:

a positioning cylinder (421); and

a connecting bracket (422) for mounting the positioning cylinder (421) on the power bracket (41);

the power end of the eccentric boring part (2) movably penetrates through the connecting bracket (422).

4. A transmission housing boring apparatus as claimed in claim 2, characterised in that the second retaining assembly (43) comprises:

circumferentially arranged holddowns (431); and

a retractable power part (432) which is arranged on the power end of the tensioning component (44) and the power end of which is connected with the pressing and holding part (431);

the power piece (432) is stored, so that the pressing and holding piece (431) is folded into the shaft hole space, and the pressing and holding piece (431) is opened to the edge of the shaft hole.

5. A transmission housing boring apparatus as set forth in claim 2 wherein said take-up assembly (44) includes:

a tensioning power member (441); and

a guide member (442) mounted on the power end of the tensioning power member (441);

the guide seat (31) is arranged on the guide piece (442) in a sliding manner.

6. A transmission case boring apparatus according to claim 2, wherein the eccentric boring part (2) comprises:

a drive assembly (21) mounted on the frame (1);

a rotating member (22) eccentrically arranged on the power end of the driving assembly (21); and

a switching knife element (23) mounted on the rotary element (22);

the driving component (21) drives the rotating piece (22) supported by the boring supporting part (3) to rotate, and simultaneously, the switching cutter piece (23) is fed into the shaft hole.

7. A transmission housing boring apparatus as claimed in claim 6, characterised in that the shift insert (23) comprises:

a tool holder (231);

a cutter (232) mounted on the holder (231); and

a switching power assembly (233) for driving the cutter (232) to switch boring;

the switching power assembly (233) switches the cutter (232) after the primary boring to a return boring state.

Images