CN111889717A - High-precision bearing mounting hole machining method based on three-coordinate machine tool - Google Patents
High-precision bearing mounting hole machining method based on three-coordinate machine tool Download PDFInfo
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- CN111889717A CN111889717A CN202010615874.3A CN202010615874A CN111889717A CN 111889717 A CN111889717 A CN 111889717A CN 202010615874 A CN202010615874 A CN 202010615874A CN 111889717 A CN111889717 A CN 111889717A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
Abstract
A high-precision bearing mounting hole machining method based on a three-coordinate machine tool relates to the field of mechanical hole machining, and when a bearing workpiece to be machined is machined, the machining method is divided into two machining procedures: a first processing procedure: carrying out high-precision machining on the hole from one hole end face of the hole of the bearing workpiece to be machined; a second processing procedure: carrying out high-precision machining on the hole from the end face of the other hole of the bearing workpiece to be machined; before two machining processes are carried out, the machining of the end face of the orifice with higher requirement on perpendicularity and the rough machining of the hole body are finished on the same process surface, and the end face of the orifice is used as a reference surface for the machining of the two machining processes; the high-precision block gauge is used as a processing standard during clamping, the uniform reference surface is kept to process the orifices of the bearing workpiece to be processed from the end surfaces of the two orifices, the block gauge is used as the reference surface during clamping, and the problem that the standard error is too high during processing of the high-precision bearing workpiece in the prior art is solved.
Description
Technical Field
The invention relates to the field of mechanical hole making, in particular to a high-precision bearing mounting hole machining method based on a three-coordinate machine tool.
Background
Aeronautical structural components have high installation requirements, particularly at the interfaces between components or parts, and some positions require bearings to be installed on key structural components to meet aircraft operation requirements while reducing wear on structural components. The hole that is used for installing the bearing on the structure is called the bearing mounting hole, and the bearing mounting hole includes the hole body and drill way terminal surface, and its characteristics are:
1. the hole diameter has higher precision (H7 grade);
2. the hole axis and the orifice end face have higher verticality requirements.
The diameter requirement of the hole body of the bearing mounting hole can be met through boring and other modes; however, the requirement for the perpendicularity between the axis of the hole and the end faces of the two ends of the orifice is difficult to realize, because the end faces of the orifice can only be machined by machining the main shaft of the machine tool from the two ends of the hole respectively. While from both directions, there is an error. In actual production, the perpendicularity between the orifice end face processed in the same direction as the hole and the hole meets the design requirement, and the perpendicularity between the orifice end face processed in the opposite direction and the hole often cannot meet the design requirement. And further analyzing the reason that the perpendicularity between the orifice end face and the hole after the reversing machining does not meet the requirement, namely the reference error exceeds the perpendicularity tolerance during the reversing machining.
Therefore, it is necessary to adjust a machining method of the bearing mounting hole to reduce a reference error in the commutation machining, thereby solving the above-described problems.
Disclosure of Invention
The invention aims to: the method for machining the high-precision bearing mounting hole based on the three-coordinate machine tool is provided, the uniform reference surface is kept for machining the hole opening of the bearing workpiece to be machined from the end surfaces of the two hole openings, the high-precision block gauge is used as the reference surface during clamping and further used as a machining standard, and the problem that the standard error is too high during machining of the high-precision bearing workpiece in the prior art is solved.
The technical scheme adopted by the invention is as follows:
a high-precision bearing mounting hole machining method based on a three-coordinate machine tool is divided into two machining procedures when a bearing workpiece to be machined is machined:
a first processing procedure: carrying out high-precision machining on the hole from one hole end face of the hole of the bearing workpiece to be machined;
a second processing procedure: carrying out high-precision machining on the hole from the end face of the other hole of the bearing workpiece to be machined;
before two machining processes are carried out, the machining of the end face of the orifice with higher requirement on perpendicularity and the rough machining of the hole body are finished on the same process surface, and the end face of the orifice is used as a reference surface for the machining of the two machining processes; and high-precision block gauges are used as processing references during clamping in the two processing procedures.
In order to better realize the scheme, further, in the first machining procedure, the bottom plane of the workpiece is used as a first reference plane for leveling when the end face of the hole of the bearing workpiece to be machined is machined; after the first machining process is finished, when a second machining process is carried out, the bearing workpiece to be machined is subjected to other hole end face machining on the turning surface, and the first reference surface is used as a second reference surface for leveling during machining.
In order to better realize the scheme, further, when clamping is carried out in the first processing procedure, the block gauge is attached to cover a processed area of the bearing workpiece to be processed, and the surface of the block gauge is used for replacing the surface of the workpiece to be processed to serve as a first reference surface.
In order to better implement the scheme, further, after a block surface attached to the surface of the end face of the hole opening of the bearing workpiece to be machined is selected as a first reference surface in the first machining procedure for leveling, the clamping in the second machining procedure comprises the following steps:
step S1 prepares a block gauge: the first reference surface is used as a second reference surface, and the surface flatness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the hole and the bearing hole;
step S2 clamping block gauge: fixing the block gauge on a machine tool workbench, wherein the second reference surface faces upwards, and the levelness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the orifice and the bearing hole;
step S3, clamping a workpiece: and attaching the end face of the hole selected by the bearing workpiece to be machined in the first machining procedure to the lower surface of the block gauge, and pressing the bearing workpiece to be machined to the block gauge.
In order to better implement the scheme, further, in step S2, the level of the second reference surface is measured by using a dial indicator or a lever indicator when the gauge block is clamped.
In order to better implement the scheme, in step S3, the bearing workpiece to be machined is pressed against the gauge block by using a pressing plate.
In order to better implement the scheme, further, when the bearing workpiece to be machined is pressed against the block gauge by using the pressing plate in the step S3, a soft gasket is added between the pressing plate and the bearing workpiece to be machined.
In the scheme, firstly, machining risk analysis is carried out, and when the end faces of two ends of the mounting hole of the bearing workpiece to be machined are machined on the three-coordinate machine tool, the main shaft of the machine tool cannot rotate, so that the machining can be realized only by turning over the bearing workpiece to be machined. The reference error is easily too large due to the following two factors after turning over:
1. the bearing workpiece to be processed is secondarily clamped, and the processing reference is not uniform;
2. the self-flatness error of the bearing workpiece to be processed is large, and the bearing workpiece cannot be leveled to the tolerance requirement range.
The analysis and solution of the two risk factors are as follows:
risk factor 1: the bearing workpiece to be processed is secondarily clamped, and the processing reference is not uniform;
the solution measures are as follows: the same processing standard is kept in the two clamping processes. That is, in the first machining step, leveling is performed with reference to one end plane of the bearing workpiece to be machined, and leveling must be performed with reference to the plane when the second surface is turned over.
Risk factor 2: the self flatness error of the bearing workpiece to be processed is large, and the bearing workpiece cannot be leveled to the tolerance requirement range;
the solution measures are as follows: after the workpiece is processed by numerical control, the surface of the workpiece is relatively flat, but the high-precision requirement of the reference surface is often not met. In order to reduce the influence of the unevenness of the surface of the workpiece on leveling, a high-precision gauge block is required, and the size of the gauge block must cover the area to be processed. The using method comprises the steps of attaching the surface of the bearing workpiece to be machined selected in the first machining procedure to the block gauge, and replacing the surface of the workpiece with the surface of the block gauge to carry out leveling operation.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the high-precision bearing mounting hole processing method based on the three-coordinate machine tool, the uniform reference surface is kept, the orifices of the bearing workpiece to be processed are processed from the end surfaces of the two orifices, the high-precision block gauge is used as the reference surface during clamping and further used as a processing standard, and the processing precision is higher when the high-precision bearing is processed compared with that of the prior art;
2. according to the high-precision bearing mounting hole machining method based on the three-coordinate machine tool, the uniform reference surface is kept, the orifices of the bearing workpiece to be machined are machined from the end surfaces of the two orifices, the high-precision block gauge is used as the reference surface during clamping and further used as a machining standard, and the problem that the standard error is too high during machining of the high-precision bearing workpiece in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solution, the drawings needed to be used in the embodiments are briefly described below, and it should be understood that, for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, wherein:
FIG. 1 is a schematic top view of a bearing workpiece to be machined according to the present invention;
FIG. 2 is a schematic left-side view of a bearing workpiece to be machined in accordance with the present invention;
FIG. 3 is a schematic view of a first process of the present invention;
FIG. 4 is a schematic view of a second process of the present invention;
in the figure, 1-a bearing workpiece to be processed, 2-a mounting hole, 3-a first orifice end face, 4-a second orifice end face, 5-a machine tool and 6-a block gauge.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in detail with reference to fig. 1 to 4.
Example 1
A high-precision bearing mounting hole machining method based on a three-coordinate machine tool is divided into two machining procedures when a bearing workpiece to be machined, as shown in figures 1 and 2, is machined:
the first processing step shown in fig. 3: carrying out high-precision machining on the hole from one hole end face of the hole of the bearing workpiece to be machined;
as in the second process of fig. 4: carrying out high-precision machining on the hole from the end face of the other hole of the bearing workpiece to be machined;
before two machining processes are carried out, the machining of the end face of the orifice with higher requirement on perpendicularity and the rough machining of the hole body are finished on the same process surface, and the end face of the orifice is used as a reference surface for the machining of the two machining processes; and high-precision block gauges are used as processing references during clamping in the two processing procedures.
The working principle is as follows: in the scheme, firstly, machining risk analysis is carried out, and when the end faces of two ends of the mounting hole of the bearing workpiece to be machined are machined on the three-coordinate machine tool, the main shaft of the machine tool cannot rotate, so that the machining can be realized only by turning over the bearing workpiece to be machined. The reference error is easily too large due to the following two factors after turning over:
1. the bearing workpiece to be processed is secondarily clamped, and the processing reference is not uniform;
2. the self-flatness error of the bearing workpiece to be processed is large, and the bearing workpiece cannot be leveled to the tolerance requirement range.
The analysis and solution of the two risk factors are as follows:
risk factor 1: the bearing workpiece to be processed is secondarily clamped, and the processing reference is not uniform;
the solution measures are as follows: the same processing standard is kept in the two clamping processes. That is, in the first machining step, leveling is performed with reference to one end plane of the bearing workpiece to be machined, and leveling must be performed with reference to the plane when the second surface is turned over.
Risk factor 2: the self flatness error of the bearing workpiece to be processed is large, and the bearing workpiece cannot be leveled to the tolerance requirement range;
the solution measures are as follows: after the workpiece is processed by numerical control, the surface of the workpiece is relatively flat, but the high-precision requirement of the reference surface is often not met. In order to reduce the influence of the unevenness of the surface of the workpiece on leveling, a high-precision gauge block is required, and the size of the gauge block must cover the area to be processed. The using method comprises the steps of attaching the surface of the bearing workpiece to be machined selected in the first machining procedure to the block gauge, and replacing the surface of the workpiece with the surface of the block gauge to carry out leveling operation.
Example 2
In this embodiment, on the basis of embodiment 1, in the first machining process, the bottom plane of the workpiece is used as a first reference plane for leveling when the bearing workpiece to be machined shown in fig. 1 and 2 is subjected to machining of one end face of the hole; after the first machining process is finished, when a second machining process is carried out, the bearing workpiece to be machined is subjected to other hole end face machining on the turning surface, and the first reference surface is used as a second reference surface for leveling during machining.
Further, when clamping is performed in the first processing procedure as shown in fig. 3, the block gauge is attached to cover the processed area of the bearing workpiece to be processed, and the surface of the block gauge is used as a first reference surface instead of the surface of the workpiece to be processed.
Further, after the surface of a block gauge attached to the surface of the end face of an orifice of a bearing workpiece to be machined is selected as a first reference surface to be leveled in the first machining procedure, the clamping in the second machining procedure shown in fig. 4 comprises the following steps:
step S1 prepares a block gauge: the first reference surface is used as a second reference surface, and the surface flatness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the hole and the bearing hole;
step S2 clamping block gauge: fixing the block gauge on a machine tool workbench, wherein the second reference surface faces upwards, and the levelness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the orifice and the bearing hole;
step S3, clamping a workpiece: and attaching the end face of the hole selected by the bearing workpiece to be machined in the first machining procedure to the lower surface of the block gauge, and pressing the bearing workpiece to be machined to the block gauge.
Further, in the step S2, the levelness of the second reference surface is measured by using a dial indicator or a lever indicator when the block gauge is clamped.
Further, in the step S3, the bearing workpiece to be processed is pressed against the gauge block by using the pressing plate.
Further, in the step S3, when the pressing plate is used to press the bearing workpiece to be machined against the gauge block, a soft gasket is added between the pressing plate and the bearing workpiece to be machined.
The working principle is as follows: the high-precision bearing workpiece to be machined as shown in fig. 1 and fig. 2 is machined, and besides the tolerance of the installation aperture, three perpendicularity tolerance requirements are required to be guaranteed, namely the perpendicularity between the hole axis and the workpiece surface A is 0.5mm, the perpendicularity between the orifice end surface 3 and the hole axis is 0.05mm, and the perpendicularity between the orifice end surface 4 and the hole axis is 0.025 mm. Because the perpendicularity requirement between the orifice end face 4 and the hole axis is the highest, the orifice end face 4 and the diameter of the bearing workpiece mounting hole to be processed are processed in place in the same machining procedure under the same clamping state, and the method comprises the following specific steps of:
in the first machining step, the bearing hole and the port end face are machined from the end face 4 side, as shown in fig. 2. Wherein, the bearing hole is firstly drilled or milled to remove large allowance, the allowance with phi of 2mm is reserved in the diameter direction, and then the boring process is in place. And the end face of the orifice is subjected to rough milling and finish milling by adopting an integral hard alloy end mill, wherein large allowance is removed by rough milling, a allowance of 0.1mm is reserved on the end face, and then the end face is subjected to finish milling in place.
The processing method of the second processing procedure is the same as that of the first processing procedure. As shown in fig. 4, the clamping step of the second processing step is as follows:
1. step S1 prepares a block gauge: the first reference surface is used as the second reference surface, and the surface flatness of the second reference surface is ensured to be not more than half of the verticality tolerance of the end surface of the hole and the bearing hole, namely 0.025 mm.
2. Clamping a block gauge: and fixing the block gauge on a machine tool workbench, wherein the second reference surface faces upwards, and the levelness of the second reference surface is ensured not to exceed half of the verticality tolerance of the end surface of the orifice and the bearing hole, namely 0.025 mm. If the requirement is not met, adjustment is carried out, and one adjustment method is to plug a shim on the edge of the bottom surface of the tool.
3. Clamping a workpiece: and attaching the end face of the hole selected by the bearing workpiece to be machined in the first machining procedure to the lower surface of the block gauge, and pressing the bearing workpiece to be machined to the block gauge.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. A high-precision bearing mounting hole machining method based on a three-coordinate machine tool is characterized by comprising the following steps of: when a bearing workpiece to be machined is machined, the machining process is divided into two machining processes:
a first processing procedure: carrying out high-precision machining on the hole from one hole end face of the hole of the bearing workpiece to be machined;
a second processing procedure: carrying out high-precision machining on the hole from the end face of the other hole of the bearing workpiece to be machined;
before two machining processes are carried out, the machining of the end face of the orifice with higher requirement on perpendicularity and the rough machining of the hole body are finished on the same process surface, and the end face of the orifice is used as a reference surface for the machining of the two machining processes; and high-precision block gauges are used as processing references during clamping in the two processing procedures.
2. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool as claimed in claim 1, wherein the machining method comprises the following steps: in the first machining procedure, when an orifice end face of a bearing workpiece to be machined is machined, the bottom plane of the workpiece is used as a first reference plane for leveling; after the first machining process is finished, when a second machining process is carried out, the bearing workpiece to be machined is subjected to other hole end face machining on the turning surface, and the first reference surface is used as a second reference surface for leveling during machining.
3. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool as claimed in claim 1, wherein the machining method comprises the following steps: when clamping is carried out in the first machining procedure, the block gauge is attached to cover a machined area of the bearing workpiece to be machined, and the surface of the block gauge is used for replacing the surface of the workpiece to be machined and used as a first reference surface.
4. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool as claimed in claim 1 or 3, wherein: in the first machining procedure, after a block gauge surface attached to the surface of an orifice end face of a bearing workpiece to be machined is selected as a first reference surface to be leveled, the clamping in the second machining procedure comprises the following steps:
step S1 prepares a block gauge: the first reference surface is used as a second reference surface, and the surface flatness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the hole and the bearing hole;
step S2 clamping block gauge: fixing the block gauge on a machine tool workbench, wherein the second reference surface faces upwards, and the levelness of the second reference surface is ensured not to exceed half of the perpendicularity tolerance of the end surface of the orifice and the bearing hole;
step S3, clamping a workpiece: and attaching the end face of the hole selected by the bearing workpiece to be machined in the first machining procedure to the lower surface of the block gauge, and pressing the bearing workpiece to be machined to the block gauge.
5. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool is characterized in that: and step S2, measuring the levelness of the second reference surface by using a dial indicator or a lever indicator when the block gauge is clamped.
6. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool is characterized in that: in step S3, the bearing workpiece to be machined is pressed against the gauge block by using the pressing plate.
7. The high-precision bearing mounting hole machining method based on the three-coordinate machine tool is characterized in that: and in the step S3, when the bearing workpiece to be machined is pressed to the block gauge by using the pressing plate, a soft gasket is added between the pressing plate and the bearing workpiece to be machined.
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Cited By (1)
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| CN113335554A (en) * | 2021-04-30 | 2021-09-03 | 成都飞机工业（集团）有限责任公司 | Shaft hole coaxiality positioning assembly and positioning method using same |
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