CN215356297U - Special tool for boring main bearing hole of diesel engine frame - Google Patents
Special tool for boring main bearing hole of diesel engine frame Download PDFInfo
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- CN215356297U CN215356297U CN202121580427.5U CN202121580427U CN215356297U CN 215356297 U CN215356297 U CN 215356297U CN 202121580427 U CN202121580427 U CN 202121580427U CN 215356297 U CN215356297 U CN 215356297U
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Abstract
The utility model discloses a special tool for boring a main bearing hole of a diesel engine frame, which comprises a workbench, a plurality of bearing seats, a boring cutter and a plurality of positioning mechanisms, wherein the workbench is provided with a plurality of positioning mechanisms; a plurality of bearing blocks are longitudinally supported on the middle part of the workbench at intervals; the boring cutter comprises a cutter bar and a plurality of cutter groups, the cutter bar is supported on a plurality of bearing seats and is in sliding connection with the bearing seats, the cutter groups are fixed on the outer circle of the cutter bar at intervals, each cutter group comprises a plurality of cutters, the cutters are uniformly distributed along the circumferential direction of the cutter bar, and the cutters are axially arranged at intervals along the cutter bar; the plurality of positioning mechanisms are arranged on one side of the workbench. The utility model can complete the processing of all main bearing holes simultaneously by only one clamping and positioning and one feeding during boring, thereby greatly reducing the labor intensity of workers, improving the processing efficiency, having stable and reliable cutting, effectively ensuring the requirements of the parallelism and the coaxiality of the main bearing holes of the frame, having good processing quality and good popularization.
Description
Technical Field
The utility model relates to a special tool for machining, in particular to a special tool for boring a main bearing hole of a diesel engine frame, and belongs to the technical field of cutting machining.
Background
As shown in fig. 1, taking a frame of a five-cylinder diesel engine as an example, the left end of the frame is a free end, the right end is a flywheel end, a first cylinder is arranged near the free end, and a second cylinder, a third cylinder, a fourth cylinder and a fifth cylinder … are arranged towards the flywheel end in sequence. The main bearing hole of the frame is composed of six coaxial semicircles and comprises five main bearing holes 10 and a thrust main bearing hole 20, the center distance of the five main bearing holes 10 is equal to the cylinder distance C, the depth of the main bearing hole 10 is B, the center distance of the thrust main bearing hole 20 and the adjacent main bearing hole 10 is C +15, the depth of the thrust main bearing hole 20 is B +30, the main bearing hole 10 and the main bearing cover of the frame are assembled for positioning a crankshaft, the length of the engine body is long, and the length of the engine body penetrates through the whole diesel medium-speed engine.
At present, when a main bearing hole is bored on a common machine tool or a numerical control machine tool, a main shaft and a common boring cutter are used for boring only the main bearing hole at the flywheel end or the free end of a frame, and the rest main bearing holes are far away from the flywheel end or the free end, so that the main shaft can be bored only by installing a lengthened boring cutter, but the lengthened boring cutter is too long to cause the vibration of the cutter, so that the boring cannot be normally carried out.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a special tool for boring a main bearing hole of a diesel engine frame, which has the advantages of simple structure, simplicity and convenience in operation, time and labor conservation and high machining efficiency.
The utility model is realized by the following technical scheme:
a special tool for boring a main bearing hole of a diesel engine frame comprises a workbench, a plurality of bearing seats, a boring cutter and a plurality of positioning mechanisms; a plurality of bearing blocks are longitudinally supported on the middle part of the workbench at intervals; the boring cutter comprises a cutter bar and a plurality of cutter groups, the cutter bar is supported on a plurality of bearing seats and is in sliding connection with the bearing seats, the cutter groups are fixed on the outer circle of the cutter bar at intervals, each cutter group comprises a plurality of cutters, the cutters are uniformly distributed along the circumferential direction of the cutter bar and are axially arranged at intervals along the cutter bar, the axial distance between the cutter positioning centers is e, each cutter comprises a cutter holder, a square cutter bar and a blade, the cutter holder is fixed on the cutter bar, the square cutter bar is positioned on one side of the cutter holder, and the blade is fixed on one side of the top of the square cutter bar; the plurality of positioning mechanisms are arranged on one side of the workbench, and the rack control surface and the rack flywheel end surface respectively abut against the plurality of positioning mechanisms during boring.
The object of the utility model is further achieved by the following technical measures.
The special tool for boring the main bearing hole of the diesel engine frame comprises a lower base, a lower half bearing bush, an upper bearing cover and an upper half bearing bush, wherein the lower base is fixedly connected with a workbench, the lower half bearing bush is fixed in a semicircular hole in the middle of the lower base, the upper half bearing bush is fixed in a semicircular hole in the middle of the upper bearing cover, the upper bearing cover is fixedly covered on the upper side of the lower base, a cutter bar is supported in a guide hole formed by the lower half bearing bush and the upper half bearing bush, and a needle valve type oil cup is further arranged at the top of the upper bearing cover.
The special tool for boring the main bearing hole of the diesel engine frame comprises a fixing block, a locking bolt, a locking nut and a positioning sleeve, wherein the fixing block is arranged in a T-shaped groove of a workbench, the positioning sleeve is arranged on the upper side of the T-shaped groove of the workbench, the lower end of the locking bolt penetrates through the positioning sleeve to be fixedly connected with the fixing block, and the upper end of the locking bolt is locked through the locking nut.
In the special tool for boring the main bearing hole of the diesel engine frame, in the circumferential direction of the cutter bar, the included angle alpha between the centers of the cutter seats of the plurality of cutters and the connecting line of the centers of the cutter bar is 120 degrees, and the axial distance between the positioning centers of the cutters is 4mm < e < 6 mm.
In the tool special for boring the main bearing hole of the diesel engine frame, the distance h1= C between the corresponding cutter positioning centers of the adjacent cutter groups, the distance h2= C +30mm between the cutter positioning centers of the flywheel end cutter group and the corresponding cutter positioning centers of the adjacent cutter groups, and C is the cylinder distance of the diesel engine.
The machine tool has the advantages of simple and compact structure, low cost, simple and convenient operation, time and labor saving, and good processing quality and popularization, can simultaneously complete the processing of all main bearing holes by only one clamping and positioning and one feeding during boring, saves the time for changing tools, aligning for many times and feeding and cutting for many times, greatly lightens the labor intensity of workers, improves the processing efficiency, ensures stable and reliable cutting and uniform size, can effectively ensure the requirements on the parallelism and the coaxiality of the main bearing holes of the machine frame, and can be used for processing the holes of the machine frame.
Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a five-cylinder diesel engine frame;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is an enlarged right view of FIG. 2;
FIG. 4 is an enlarged sectional view A-A of FIG. 2;
fig. 5 is a schematic structural diagram of the machining of the main bearing hole of the diesel engine frame by using the machining tool.
Detailed Description
The utility model is further illustrated by the following figures and examples.
In the present embodiment, the machining of the main bearing hole of the five-cylinder diesel engine frame is taken as an example, and the machining of the main bearing hole of the diesel engine frame with the remaining number of cylinders is the same as that.
As shown in fig. 2, 3 and 4, the utility model comprises a workbench 1, three bearing seats 2, a boring cutter 3 and three positioning mechanisms 4, wherein a plurality of T-shaped grooves 11 are arranged on the upper side of the workbench 1 at intervals along the longitudinal direction. Three bearing blocks 2 are longitudinally supported on the middle part of the workbench 1 at intervals, the center of the middle bearing block 2 is coincided with the center of a third cylinder, the bearing block 2 comprises a lower base 21, a lower half bush 22, an upper bearing cover 23 and an upper half bush 24, the lower base 21 is fixedly connected with the workbench through a fastener, the lower half bush 22 is fixed in a semicircular hole in the middle part of the lower base 21, the upper half bush 24 is fixed in a semicircular hole in the middle part of the upper bearing cover 24, the upper bearing cover 23 covers the upper side of the lower base 21, the upper base and the lower bearing cover are fixedly connected through the fastener, the lower half bush 22 and the upper half bush 24 form a guide hole, a needle valve type oil cup 25 is further arranged at the top of the upper bearing cover 23, and the cutter bar 31 can be lubricated.
The boring cutter 3 comprises a cutter bar 31 and six cutter groups 32, the cutter bar 31 is supported in the guide holes of the three bearing seats 2 and can slide left and right along the guide holes, the six cutter groups 32 are fixed on the outer circle of the cutter bar 31 at intervals, each cutter group 32 comprises three cutters, the three cutters are uniformly distributed along the circumferential direction of the cutter bar 31, as shown in fig. 4, in the circumferential direction of the cutter bar 31, the included angle alpha between the centers of the cutter seats 321 of the three cutters and the center connecting line of the cutter bar 31 is 120 degrees, the three cutters are arranged at intervals from left to right along the axial direction of the cutter bar 31, the axial distance between the cutter positioning centers is e, and in the embodiment, 4mm < e < 6 mm. Each cutter comprises a cutter seat 321, a square cutter rod 322 and a cutter blade 323, the cutter seat 321 is positioned by a positioning pin 324 and is fixed on the cutter rod 31 by a bolt 325, the square cutter rod 322 is positioned on one side of the cutter seat 321, and the cutter blade 323 is fixed on one side of the top of the square cutter rod 322 by a fastener. The distance h1= C between the cutter positioning centers corresponding to the adjacent cutter group 32, the distance h2= C +30mm between the cutter positioning centers corresponding to the flywheel end cutter group 32 and the adjacent cutter group 32, and C is the cylinder distance of the diesel engine. And the outer circle d of the tool bar 31 satisfies dmax = z-0.2 and dmin = z-0.3, where z is the inner diameter of the guide hole, the length of the tool bar 31 is L + R1+ R2, as shown in fig. 5, L is the length of the housing, and R1 and R2 are safety distances.
Three positioning mechanism 4 sets up on one side of workstation 1, and positioning mechanism 4 includes fixed block 41, locking bolt 42, lock nut 43 and position sleeve 44, and fixed block 41 sets up in the T type groove 11 of workstation 1, and position sleeve 44 sets up the T type groove 11 upside at workstation 1, and the lower extreme of locking bolt 42 passes position sleeve 44 and closes firmly with fixed block 41 soon, and the upper end of locking bolt 42 is passed through lock nut 43 and is locked. Two positioning mechanisms 4 are arranged on a T-shaped groove 11 on the outermost side of one side of the workbench 1, the centers of the two positioning mechanisms are respectively corresponding to the center of a first cylinder and the center of a fifth cylinder of the rack, meanwhile, the distance between the inner sides of positioning sleeves 44 of the two positioning mechanisms 4 and the center of the cutter bar 31 is equal to the distance between a control surface of the rack and the center of the cutter bar 31, the rest positioning mechanism 4 is arranged at the right end of one side of the workbench 1 and corresponds to the end face of a flywheel end of the rack, the distance between the inner side of the positioning sleeve 44 and the center of the middle bearing seat 2 is equal to the distance between the flywheel end face of the rack and the center of the third cylinder, and meanwhile, the distance between the center of the positioning mechanism 4 and the center of the cutter bar 31 is equal to the distance between the two T-shaped grooves 11. When boring, the control surface of the frame abuts against the inner sides of the positioning sleeves 44 of two positioning mechanisms 4 to ensure that the axis of the main bearing hole of the frame is coaxial with the axis of the cutter arbor, and the end surface of the flywheel of the frame abuts against the inner side of the positioning sleeve 44 of the rest positioning mechanism 4 to ensure that the center of the intermediate bearing seat 2 is coincident with the center of the third cylinder of the frame.
As shown in fig. 5, the boring step using the present invention is as follows:
1) the utility model is arranged on a rotary worktable of a common floor boring machine as required, and the cutter bar 31 is rotated to ensure that the cutter bar can freely rotate and slide in the guide hole;
2) aligning the axis of the cutter bar 31 to ensure that the axis of the cutter bar 31 is coaxial with the axis of the machine tool spindle, and connecting the right end of the cutter bar 31 with the machine tool spindle through a coupler 30;
3) manually rotating the cutter bar 31 to enable the cutter point of the left blade of each cutter to be vertically upward, simultaneously ensuring the cutter bar 31 to be at the limit position of the right end, and increasing the safety distance between the cutter point of the left blade and the end surface of the corresponding main bearing hole and the end surface of the thrust main bearing hole as much as possible to be about 80 mm;
4) the bottom surface of the frame faces downwards, the end face of a flywheel faces rightwards, the frame is supported on the workbench 1, the control surface of the frame is abutted against two positioning sleeves 44 on one side of the workbench 1, and the end face of the flywheel end of the frame is abutted against the positioning sleeve 44 on the right end of the workbench 1, so that the centers of the main bearing holes 10 in the frame and the cutter bar 31 are equal in height through three-surface positioning, the centers of the main bearing holes 10 and the cutter bar 31 are concentric, the center of the intermediate bearing seat 2 is coincided with the center of a third cylinder of the frame, and finally the control surface and the exhaust surface of the frame are respectively pressed by pressing plates;
5) manually feeding to enable the safe distance a between the tool nose of the left blade of the tool at the tail end of the flywheel end and the right end face of the thrust main bearing hole 20 to be 10mm, and enabling the safe distances b between the tool noses of the rest left blades and the end face of the main shaft hole 10 to be 25 mm;
6) starting a machine tool spindle to enable the six cutter groups 32 to rotate clockwise respectively;
7) feeding a machine tool main shaft from right to left until the safety distance between the tool nose of a right blade of a tool at the tail end of a flywheel and the left end surface of the thrust main bearing hole 20 is 10mm, and finishing the boring of all main bearing holes at the moment;
8) stopping the rotation of the machine tool spindle;
9) manually rotating the cutter bar 31 to enable the safe distance between the tool nose of the right blade of the tool at the tail end of the flywheel end and the left end face of the thrust main bearing hole 20 to be 80 mm;
10) loosening the press plates of the control surface and the exhaust surface of the rack, and taking down the rack from the workbench;
11) and repeating the actions 3) -10), and finishing the boring machining of the main bearing hole on the next frame.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a diesel engine frame main bearing hole bore hole specialized tool which characterized in that: comprises a workbench, a plurality of bearing seats, a boring cutter and a plurality of positioning mechanisms; a plurality of bearing blocks are longitudinally supported on the middle part of the workbench at intervals; the boring cutter comprises a cutter bar and a plurality of cutter groups, the cutter bar is supported on a plurality of bearing seats and is in sliding connection with the bearing seats, the cutter groups are fixed on the outer circle of the cutter bar at intervals, each cutter group comprises a plurality of cutters, the cutters are uniformly distributed along the circumferential direction of the cutter bar and are axially arranged at intervals along the cutter bar, the axial distance between the cutter positioning centers is e, each cutter comprises a cutter holder, a square cutter bar and a blade, the cutter holder is fixed on the cutter bar, the square cutter bar is positioned on one side of the cutter holder, and the blade is fixed on one side of the top of the square cutter bar; the plurality of positioning mechanisms are arranged on one side of the workbench, and the rack control surface and the rack flywheel end surface respectively abut against the plurality of positioning mechanisms during boring.
2. The tool special for boring the main bearing hole of the diesel engine frame as claimed in claim 1, wherein: the bearing block comprises a lower base, a lower half bush, an upper bearing cover and an upper half bush, wherein the lower base is fixedly connected with the workbench, the lower half bush is fixed in a semicircular hole in the middle of the lower base, the upper half bush is fixed in a semicircular hole in the middle of the upper bearing cover, the upper bearing cover is fixedly covered on the upper side of the lower base, a cutter bar is supported in a guide hole formed by the lower half bush and the upper half bush, and a needle valve type oil cup is further arranged at the top of the upper bearing cover.
3. The tool special for boring the main bearing hole of the diesel engine frame as claimed in claim 1, wherein:
the positioning mechanism comprises a fixing block, a locking bolt, a locking nut and a positioning sleeve, the fixing block is arranged in a T-shaped groove of the workbench, the positioning sleeve is arranged on the upper side of the T-shaped groove of the workbench, the lower end of the locking bolt penetrates through the positioning sleeve to be fixedly connected with the fixing block, and the upper end of the locking bolt is locked through the locking nut.
4. The tool special for boring the main bearing hole of the diesel engine frame as claimed in claim 1, wherein: in the circumferential direction of the cutter bar, the included angle alpha between the centers of the cutter seats of the plurality of cutters and the connecting line of the centers of the cutter bar is 120 degrees, and the axial distance between the positioning centers of the cutters is more than 4mm and less than e and less than 6 mm.
5. The tool special for boring the main bearing hole of the diesel engine frame as claimed in claim 1, wherein: the distance h1= C between the cutter positioning centers corresponding to the adjacent cutter groups, the distance h2= C +30mm between the flywheel end cutter group and the cutter positioning center corresponding to the adjacent cutter group, and C is the cylinder distance of the diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121580427.5U CN215356297U (en) | 2021-07-13 | 2021-07-13 | Special tool for boring main bearing hole of diesel engine frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121580427.5U CN215356297U (en) | 2021-07-13 | 2021-07-13 | Special tool for boring main bearing hole of diesel engine frame |
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| Publication Number | Publication Date |
|---|---|
| CN215356297U true CN215356297U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121580427.5U Active CN215356297U (en) | 2021-07-13 | 2021-07-13 | Special tool for boring main bearing hole of diesel engine frame |
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| CN (1) | CN215356297U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333820A (en) * | 2021-07-13 | 2021-09-03 | 中船动力镇江有限公司 | Special tool for boring main bearing hole of diesel engine frame and boring method |
| CN116532691A (en) * | 2023-05-31 | 2023-08-04 | 河南柴油机重工有限责任公司 | Boring bar guiding device and maintenance method for diesel engine shaft hole machine tool |
-
2021
- 2021-07-13 CN CN202121580427.5U patent/CN215356297U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333820A (en) * | 2021-07-13 | 2021-09-03 | 中船动力镇江有限公司 | Special tool for boring main bearing hole of diesel engine frame and boring method |
| CN116532691A (en) * | 2023-05-31 | 2023-08-04 | 河南柴油机重工有限责任公司 | Boring bar guiding device and maintenance method for diesel engine shaft hole machine tool |
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