CN114226779B - Machining method for long suspension deep eccentric step small hole - Google Patents
Machining method for long suspension deep eccentric step small hole Download PDFInfo
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- CN114226779B CN114226779B CN202111512951.3A CN202111512951A CN114226779B CN 114226779 B CN114226779 B CN 114226779B CN 202111512951 A CN202111512951 A CN 202111512951A CN 114226779 B CN114226779 B CN 114226779B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000725 suspension Substances 0.000 title claims abstract description 10
- 238000003754 machining Methods 0.000 title claims description 27
- 238000012545 processing Methods 0.000 claims abstract description 53
- 238000003672 processing method Methods 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 5
- 235000015112 vegetable and seed oil Nutrition 0.000 description 4
- 239000008158 vegetable oil Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 102220060547 rs786203080 Human genes 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B41/14—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for very small holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
- B23B47/28—Drill jigs for workpieces
Abstract
The invention discloses a processing method of a long suspension deep eccentric step small hole, which adopts a vertical drilling machine to firstly process a first inner hole, a first tool is fixed in a first cavity, a drill bit guiding hole is arranged on the first tool, a drill bit enters from a first opening end on the first cavity, and the first inner hole is processed on the end face where a second opening end is positioned after passing through the drill bit guiding hole; then processing a second inner hole, dismantling a first tool fixed in the first cavity, fixing a second tool in the first cavity, arranging a drill bit guide hole on the second tool, enabling a drill bit to enter from the first opening end of the first cavity, and processing a second inner hole on the bottom surface of the first inner hole after passing through the drill bit guide hole. Wherein, when processing the first hole, adopt ordinary drill bit, flat bottom drill and flat bottom cutter respectively to divide three step processing. The invention has high processing qualification rate, short processing period, low processing cost and guaranteed processing quality.
Description
Technical Field
The invention relates to a processing method and a processing device for a long suspension deep eccentric step small hole, and belongs to the technical field of machining.
Background
As shown in fig. 1, for a part with a long and deep step hole, one of the main factors affecting the processing of the part is that the flexibility of the processing tool caused by the structure and position of the step hole in the part is very large, and currently, the processing method of the step hole mainly comprises the following 3 steps:
(1) Positioning, drilling and reaming an eccentric hole on a coordinate milling or boring machine;
(2) Positioning, drilling, countersinking or milling an eccentric hole on a machining center;
(3) Special processing such as electric spark processing, laser processing, etc.
The main problems of the method are as follows:
in the 1 st method, the high flexibility of the drill bit leads to low processing speed, uncontrollable processing quality, low service life of the cutter, very low product qualification rate, long processing time, high processing cost and the like;
the 2 nd method has the same problems as the 1 st method;
the problems with the 3 rd method are mainly: the processing tool has high manufacturing requirement, low processing speed, long processing time, high processing cost and the like.
In summary, the difficulty in processing the step small holes in the parts is more remarkable.
Disclosure of Invention
The invention aims to provide a processing method of a long suspension deep eccentric step small hole, comprehensively solve the problems existing in the processing of the parts, and starts from the aspects of processing equipment, indirectly improving the rigidity of a drill bit, adjusting the processing method and the like, and aims to improve the processing qualification rate of the step small hole, shorten the processing period, reduce the processing cost and eliminate the hidden quality trouble.
The invention is realized by the following technical scheme:
the method for processing the long-overhang deep eccentric step small hole comprises the steps of forming a first inner hole and a second inner hole which are different in axis and parallel, wherein the first inner hole and the second inner hole are tangent, the first inner hole with larger inner diameter is intersected with a first cavity, the second inner hole with smaller inner diameter is intersected with a second cavity, the axis of the step small hole is parallel to the axis of the first cavity and perpendicular to the axis of the second cavity, an eccentric distance (forming an eccentric step hole) is arranged between the axis of the step small hole and the axis of the first cavity, the axial distance between the end intersected with the first inner hole and the first opening end of the first cavity is far greater than the inner diameter of the first inner hole (forming the long-overhang deep condition), the end intersected with the first inner hole and the second opening end of the first cavity are located on the same end face, the opening end of the second cavity is located in the direction of the axis of the second cavity and far away from the end face of the second inner hole and the second cavity, the first cavity is provided with a penetrating hole on the inner wall of the first cavity,
step one, machining a first inner hole, fixing a first tool in a first cavity, wherein a drill bit guiding hole is formed in the first tool, a drill bit enters from a first opening end of the first cavity, and machining the first inner hole on the end face of a second opening end after passing through the drill bit guiding hole;
step two, processing a second inner hole, dismantling a first tool fixed in the first cavity, fixing a second tool in the first cavity, arranging a drill bit guiding hole on the second tool, enabling a drill bit to enter from a first opening end of the first cavity, and processing a second inner hole on the bottom surface of the first inner hole after passing through the drill bit guiding hole.
Further, the first tool and the second tool also comprise,
the first screw hole penetrates through the upper end face and the lower end face of the first tool;
the first opening positioning groove is positioned on the circumferential surface of the first tool;
the second screw hole penetrates through the upper end face and the lower end face of the second tool;
the second opening positioning groove is positioned on the circumferential surface of the second tool;
the baffle is provided with a notch;
the screw is matched with the notch on the baffle and the first screw hole or the second screw hole and is used for fixing the first tool or the second tool from one side of the second opening end of the first cavity;
the positioning pin comprises a first outer surface matched with the through hole on the first cavity and a second outer surface matched with the first opening positioning groove and the second opening positioning groove, and when the first tool or the second tool is fixed in the first cavity, the positioning pin penetrates through the through hole and is inserted into the first opening positioning groove or the second opening positioning groove;
the screw rod, there are a step and a screw thread section on the screw rod, the external diameter of step is greater than the internal diameter of first screw and second screw, and screw thread section cooperates with first screw or second screw for install and dismantle first frock and second frock.
Further, the outer circumferential surface of the first tool is in clearance fit with the inner wall of the first cavity, and the outer circumferential surface of the second tool is in clearance fit with the inner wall of the first cavity.
Further, in the first step, when the first inner hole is machined, the first tool is kept still, the common drill with the outer diameter equal to the inner diameter of the first inner hole is used for machining, the depth of the drill tip is reserved with a countersink allowance, then a flat-bottom drill with the outer diameter equal to the inner diameter of the first inner hole is used for machining a counter bore, the depth is reserved with a countersink allowance, and finally the flat-bottom cutter with the outer diameter equal to the inner diameter of the first inner hole is used for finishing the counter bore to the depth requirement of the first inner hole.
Alternatively, the main relief angle of the flat bottom drill bit is 1 ° to 3 °.
Further, in the second step, when the second inner hole is machined, the second tool is kept still, the second tool is firstly machined by a common drill bit with the outer diameter equal to the inner diameter of the second inner hole, then the second tool is disassembled, and a chamfer drill with the outer diameter larger than the inner diameter of the first inner hole is used for machining a chamfer at the orifice of the first inner hole.
Alternatively, the size precision of the drill guide hole on the first tool is consistent with the size precision of the first inner hole, and the tolerance is biased to the lower limit, and the size precision of the drill guide hole on the second tool is consistent with the size precision of the second inner hole, and the tolerance is biased to the lower limit.
Alternatively, the first and second steps are performed on a vertical drill.
Compared with the existing processing method, the drilling processing method starts from the aspects of changing processing equipment, indirectly improving the rigidity of the cutter, adjusting the operation method and the like, and has the advantages of simple and convenient operation, reliable quality, short processing period and low manufacturing cost.
Drawings
FIG. 1 is a schematic view of a processing sample according to the present invention;
FIG. 2 is a schematic diagram of a first tooling and a second tooling;
FIG. 3 is a schematic view of a screw, dowel pin, baffle, and threaded rod;
FIG. 4 is a schematic view of five tools for machining a first bore and a second bore after sharpening;
in the figure: 1-first frock, 2-second frock, 3-locating pin, 4-screw, 5-baffle, 6-screw rod, 7-chamfer bores, 8-first hole common bore, 9-first hole flat bottom bores, 10-first hole flat bottom cutters, 11-second hole common bore.
Detailed Description
The present invention will be further described with reference to the drawings and the specific embodiments, but it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made according to the ordinary skill and familiar means of the art to which this invention pertains are included within the scope of the present invention without departing from the above technical idea of the invention.
The part shown in figure 1 is provided with two blind holes with mutually perpendicular axes, a step small hole is arranged on the bottom surfaces of the two blind holes, the step small hole is communicated with the two blind holes, two ends of the step small hole are respectively positioned on the bottom surfaces of the two blind holes, the axes of the step small hole are parallel to the inner diameter in figure 1Is provided with an eccentric distance 12 between the blind hole axis of (2) and the blind hole axis of (2)>The bottom surface of the blind hole is provided with a through hole so that +.>The blind hole is communicated with the end face of the part A in fig. 1. The step small hole is made of->Hole and->Hole assembly (S)>Hole and->The axes of the holes are parallel, and an eccentric distance with the size of 1 is arranged between the axes of the holes>The depth of the hole was 1.5./>A through hole is arranged on the inner wall of the blind hole near the bottom surface. Due to->The plane of the hole is->The axial distance at the orifice of the blind hole is far greater than +.>Resulting in a processing->The flexibility of the drill bit is very great during the hole, and the same applies, < ->The processing of the holes also has the problems, and finally results inHole and->The processing speed of the hole is low, the processing quality is uncontrollable, the service life of the cutter is low, the product percent of pass is very low, the processing time is long, and the processing cost is high.
In this example, the following method was usedHole and->Holes, thereby overcoming the problems of the conventional processing method.
1. Tooling design (unless otherwise noted, the following dimensions are in mm):
(1) Two pairs of tools with drill bit guiding function, namely drillsSecond fixture 2 (see fig. 2) of hole and countersink->The first tooling 1 (as shown in fig. 2) of the hole is provided with two drill guide holes on the first tooling 1 and the second tooling 2, so that the rigidity of the drill is indirectly improved. During processing, the runout of the front end of the drill bit is controlled within an allowable range. The hardness of the first tool 1 and the second tool 2 is HRC 58-62, and the material is T10A.
As shown in FIG. 2, the first tool 1 and the second tool 2 are disc-shaped, and the outer round surfaces of the first tool and the second tool and the parts areThe blind holes are in clearance fit, so that the clearance is not more than 0.02; the perpendicularity between the outer circular surface and the end surface of the blind hole is not more than 0.02.
Two on the first tooling 1Two +.>The size precision of the drill guide hole is required to be equal to the size of the hole to be processed on the part (in the case of the part)>Hole and->Holes) are uniform in size and have a lower tolerance.
(2) The peripheral surfaces of the first tool 1 and the second tool 2 are respectively provided with a first opening positioning groove and a second opening positioning groove (shown in figure 2) for being matched with a positioning pin 3 (shown in figure 3) so as to ensure processingHole and->Kong Shidi circumferential positioning of drill guide holes on tool 1 and second tool 2.
The locating pin 3 is in clearance fit with the through hole on the part, so that the clearance is ensured to be 0.01-0.03; the locating pin 3 is in clearance fit with the first opening locating groove and the second opening locating groove, and the clearance is guaranteed to be 0.02-0.04.
(3) The centers of the first tool 1 and the second tool 2 are respectively provided with a first threaded hole and a second threaded hole, the first threaded hole and the second threaded hole are positioned between the two drill guide holes, and when the first tool 1 and the second tool 2 are respectively arranged onAfter the blind holes are in place, the first tool 1 or the second tool 2 is locked from the surface A outside the part by using a screw 4 (shown in figure 3) and a baffle 5 (shown in figure 3), namely the baffle 5 is horizontally placed on the surface A, the head of the screw 4 is pressed on the baffle 5, and the thread section of the screw 4 passes through a notch on the baffle 5, the surface A and the surface B>The through holes among the blind holes are connected with a first threaded hole or a second threaded hole, and the first tool 1 or the second tool 2 is in the +.>The blind hole is internally fixed.
(4) The tool further comprises a screw 6 for facilitating the mounting and dismounting of the first tool 1 and the second tool 2. When the first tool 1 and the second tool 2 are placed and disassembled, the threaded section of the screw rod 6 (shown in figure 3) is screwed into the first threaded hole or the second threaded hole, and then is inserted or pulled outAnd (5) a blind hole.
2. Bit optimization:
the drill bit is modified to the configuration shown in fig. 4 for the structural features of the parts in fig. 1.
Due to the part inThe holes are flat bottom holes and are equal to +.>The holes (through holes) are tangential, the roughness of the surface of the flat bottom hole is Ra3.2,holes, & gt>The hole diameter tolerance and the form and position tolerance of the holes are required to be smaller, so the following aspects are noted when sharpening the drill bit:
1) And the symmetry degree of the cutting edge is controlled. If the symmetry degree of the drill bit is not well controlled when the drill bit is sharpened, the aperture is larger; the flat bottom drill is not straight in sharpening, the back angle is not well controlled, and the surface roughness of the machined hole can not meet the requirements, the aperture is out of tolerance and the like. Sharpening the drill bit, flat bottom drill, is a critical step.
2) And (5) edging the edges and grinding the cutting edges. The drill bit is tested by adopting the leftover materials which are the same as the materials of the parts, and two parts are respectively groundIs a->Is used for sharpening one pieceWhen sharpening the drill bit, if the drill bit trial drilling aperture is bigger, the drill bit can be sharpened by using oilstone, and the drill bit is sharpenedThe main cutting edge relief surface of the flat bottom drill is also polished by using the oilstone, and the main cutting chip of the flat bottom drill can be straightened and smooth by using the oilstone for polishing.
3) The main back angle of the flat bottom drill is about 1-3 degrees. If the main relief angle is bigger, the processed surface roughness is worse, and the ripple phenomenon is easy to generate. If the main relief angle is smaller, the drill bit and the part are in an extrusion state, the cutting resistance is greatly increased, the cutting performance is poorer, the vibration of the drill bit is obvious, and the machined surface roughness also cannot meet the requirement.
4) Flat bottom drillAnd (5) reamer modification. Due toThe cutting force of the flat bottom drill is larger if +.>The drill bit is not sufficiently rigid and the machining efficiency is also low. The reamer sharpening is changed, and the reamer sharpening has the advantages that firstly, the diameter of the cutting edge of the cutter is stable, the clearance between the drill bit and the first tool 1 or the second tool 2 is convenient to control, secondly, the cutting edge is shorter, and the rest is the polished rod, so that the rigidity of the reamer is greatly improved.
3. The processing method comprises the following steps:
because the positioning flexibility of equipment such as a coordinate milling machine, a boring machine, a machining center and the like is insufficient, the centering of the drill bit and the drill bit guide hole on the first tool 1 or the second tool 2 is difficult, the vertical drilling equipment is finally selected for machining, and the machining steps are as follows:
1) At the position ofThe blind hole is internally provided with a first tool 1 which is used for +.>Drill bit machining->Hole, drill point depth leaving spot facing allowance;
2) Without dismantling the first tool 1 and maintaining its position, usingMachining of flat bottom drill>Countersink, deeply reserving countersink machining allowance;
3) Without dismantling the first tool 1 and maintaining its position, usingFlat bottom tool finishing->Countersink to the depth requirement;
4) Disassembling the first tool 1, in the following steps ofA second tool 2 is arranged in the blind hole and is made of +.>Drill bit machining->A hole;
5) Removing the second tool 2 byChamfer drill machining->The orifice of the hole is chamfered.
The detailed embodiments are as follows:
1) ProcessingPreparing holes:
cleaning the parts and the first tool 1, screwing the screw rod 6 into the first threaded hole of the first tool 1, and loading the partsBlind hole and bottom (note the directional position of the machining hole). After the first tooling 1 is assembled in place, the positioning pin 3 is used for positioning, the positioning pin is inserted from a through hole on the side surface of the part and matched with a first opening positioning groove on the first tooling 1, and the screw 4 and the baffle 5 are screwed in from the outer side of the surface A of the part and are pressed. Confirm the first tooling 1 in the part +.>Whether the blind hole is internally provided with shaking or not, if so, the first tool 1 is proved to be not installed correctly, the first tool 1 is taken out for reinstallation until the first tool 1 is not shaking, the screw rod 6 is screwed out, and the screw 4 is screwed again.
2) By common methodsDrill bit (first bore common drill 8 in fig. 4) machining +.>Holes:
clamping the part with the first tool 1 by a precision vice, and grinding the part with a common cutterIs aligned with the drill bit. The depth of the hole is processed by a drill bit according to the drawing size of the part, and the depth is calculated from the part +.>The dimension from the upper end to the lower end of the blind hole is 65.5, the tolerance is 0.05, and the +.>The depth of the upper end of the blind hole is 67.05, the tolerance is qualified within 0.05, and the size can be calculated from +.>The size from the lower end of the hole to the flat bottom hole is 1.3, the hole is well sized by a dial indicator on a bench drill, the rotating speed is adjusted to 800 revolutions per minute, the hole is drilled to the size of 1.3, and molybdenum disulfide is added for cooling during drilling.
3) By usingProcessing of the flat bottom drill (first bore flat bottom drill 9 in fig. 4)>And (3) countersink:
clamping, sharpening and testingThe flat bottom drill is turned to 120 revolutions per minute, the machine tool is started to see whether the drill bit swings, and the clamping error is eliminated again until no obvious jumping phenomenon exists. From part +.>The size from the lower end of the blind hole to the flat bottom hole is 1.5, the tolerance is qualified within 0.05, and the good size is 1.45 to 1.50 by a dial indicatorHowever, the vegetable oil is used for cooling in the processing step, the flat bottom drill is slowly drilled down, and the vegetable oil is added for cooling until the final 0.1, so that the lubrication is kept sufficient.
4) By usingFinishing of flat bottom tool (first bore flat bottom tool 10 in fig. 4)>And (3) countersink:
clamping, sharpening and testingAnd the flat bottom cutter is used for adjusting the rotation speed of the vertical drill to 120 revolutions per minute, and starting the machine tool to see whether the drill bit swings or not, so that the clamping error is eliminated again until no obvious jumping phenomenon exists. From part +.>The size from the lower end of the blind hole to the flat bottom hole is 1.5, the tolerance is qualified within 0.05, the good size is 1.50-1.55 by using a dial indicator, vegetable oil is needed for cooling in the processing step, the flat bottom drill is slowly drilled down, and the vegetable oil is needed to be added for cooling until the final 0.1, so that the lubrication is kept sufficient.
5) Measurement ofKong Xiangguan size:
removing the parts, removing the first tool 1, cleaning, measuring the hole size with a depth micrometer, (actually measuring)The depth of the blind hole is converted into->The precision of the hole from the upper end face of the blind hole to the flat bottom hole) and if the measured size is not within the required size range, the part can be processed on the vertical drill to the size range (the first tool 1 can not be installed at the moment).
6) ProcessingPreparing holes:
cleaning the parts and the second tool 2, screwing the screw rod 6 into a second threaded hole of the second tool 2, and loading the partsBlind hole and bottom (note the directional position of the machining hole). After the second tooling 2 is assembled in place, the positioning pin 3 is used for positioning, the positioning pin 3 is inserted from a through hole at the side end of the part and is matched with a second opening positioning groove of the second tooling 2, and the screw 4 and the baffle 5 are screwed to compress. Confirm that the second fixture 2 is +.>If the blind hole is not swayed, the second tool 2 is proved to be not correctly installed, the second tool 2 is taken out for reinstallation until the second tool 2 is not swayed, the screw rod 6 is screwed out at the moment, and the screw 4 is screwed again.
7) ProcessingHoles:
processingDuring this, care should be taken that the hole is associated with +.>The side surfaces of the flat bottom holes are tangent. First use->Is repaired out ++>Is removed by 0.3 on one side (/ -for the orifice burr)>Pitch of holes->The blind hole wall is 0.5, too large chamfer drill can not be used, otherwiseScratch->Blind via sidewalls). By the treatment of step 2) above +.>Method for boring, in which a second bore common drill 11 of FIG. 4 is used to machine +.>The through holes are turned to 1200 rpm by the bench drill and cooled by molybdenum disulfide.
8) Completion ofAnd->And (5) processing the hole, and taking out the second tool 2.
Claims (5)
1. A processing method of a long suspension deep eccentric step small hole, the step small hole is composed of a first inner hole and a second inner hole which are different in axis and parallel, the first inner hole is tangential to the second inner hole, the first inner hole with larger inner diameter is intersected with a first cavity, the second inner hole with smaller inner diameter is intersected with a second cavity, the axis of the step small hole is parallel to the axis of the first cavity and perpendicular to the axis of the second cavity, an eccentric distance is arranged between the axis of the step small hole and the axis of the first cavity, the axial distance between one end of the first inner hole intersected with the first cavity and a first opening end of the first cavity is far greater than the inner diameter of the first inner hole, one end of the first inner hole intersected with the first cavity and a second opening end of the first cavity are located on the same end face, the second opening end of the second cavity is located on the axis direction of the second cavity and far away from the end face where the second inner hole is intersected with the second cavity, and a through hole is arranged on the inner wall of the first cavity, and the processing method is characterized in that:
the processing method comprises the steps of,
firstly, machining a first inner hole, fixing a first tool in a first cavity, wherein a drill bit guide hole is formed in the first tool, a drill bit enters from a first opening end of the first cavity, machining the first inner hole on the end face of a second opening end after passing through the drill bit guide hole, keeping the first tool motionless when machining the first inner hole, firstly machining by using a common drill bit with the outer diameter equal to the inner diameter of the first inner hole, leaving a countersink allowance in the depth of a drill tip, then machining a counter bore by using a flat-bottom drill with the outer diameter equal to the inner diameter of the first inner hole, leaving a countersink allowance in the depth, and finally finishing the counter bore to the depth of the first inner hole by using a flat-bottom cutter with the outer diameter equal to the inner diameter of the first inner hole;
step two, machining a second inner hole, dismantling a first tool fixed in the first cavity, fixing the second tool in the first cavity, forming a drill bit guide hole on the second tool, enabling a drill bit to enter from a first opening end of the first cavity, machining the second inner hole on the bottom surface of the first inner hole after passing through the drill bit guide hole, keeping the second tool still when machining the second inner hole, machining by using a common drill bit with the outer diameter equal to the inner diameter of the second inner hole, then dismantling the second tool, and machining a chamfer at a hole opening of the first inner hole by using a chamfer drill with the outer diameter larger than the inner diameter of the first inner hole;
the first tooling and the second tooling further comprise,
the first screw hole penetrates through the upper end face and the lower end face of the first tool;
the first opening positioning groove is positioned on the circumferential surface of the first tool;
the second screw hole penetrates through the upper end face and the lower end face of the second tool;
the second opening positioning groove is positioned on the circumferential surface of the second tool;
the baffle is provided with a notch;
the screw is matched with the notch on the baffle and the first screw hole or the second screw hole and is used for fixing the first tool or the second tool from one side of the second opening end of the first cavity;
the positioning pin comprises a first outer surface matched with the through hole on the first cavity and a second outer surface matched with the first opening positioning groove and the second opening positioning groove, and when the first tool or the second tool is fixed in the first cavity, the positioning pin penetrates through the through hole and is inserted into the first opening positioning groove or the second opening positioning groove;
the screw rod, there are a step and a screw thread section on the screw rod, the external diameter of step is greater than the internal diameter of first screw and second screw, and screw thread section cooperates with first screw or second screw for install and dismantle first frock and second frock.
2. The method for processing the long suspension deep eccentric step small hole according to claim 1, which is characterized in that: the outer circumferential surface of the first tool is in clearance fit with the inner wall of the first cavity, and the outer circumferential surface of the second tool is in clearance fit with the inner wall of the first cavity.
3. The method for processing the long suspension deep eccentric step small hole according to claim 1, which is characterized in that: the main back angle of the flat bottom drill bit is 1-3 degrees.
4. The method for processing the long suspension deep eccentric step small hole according to claim 1, which is characterized in that: the size precision of the drill guide hole on the first tool is consistent with the size precision of the first inner hole, and the tolerance is lower than the lower limit, and the size precision of the drill guide hole on the second tool is consistent with the size precision of the second inner hole, and the tolerance is lower than the lower limit.
5. The method for processing the long suspension deep eccentric step small hole according to claim 1, which is characterized in that: the first step and the second step are implemented on a vertical drilling machine.
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| CN202111512951.3A CN114226779B (en) | 2021-12-11 | 2021-12-11 | Machining method for long suspension deep eccentric step small hole |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988010166A1 (en) * | 1987-06-25 | 1988-12-29 | Sandor Janos Rozsa | Device for drilling holes |
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| CN114226779A (en) | 2022-03-25 |
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