CN106994530B - Mechanical processing method for avoiding magnesium alloy magnesium chips from burning - Google Patents

Mechanical processing method for avoiding magnesium alloy magnesium chips from burning Download PDF

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CN106994530B
CN106994530B CN201710262992.9A CN201710262992A CN106994530B CN 106994530 B CN106994530 B CN 106994530B CN 201710262992 A CN201710262992 A CN 201710262992A CN 106994530 B CN106994530 B CN 106994530B
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magnesium
recovery
cutter
magnesium alloy
machining
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CN106994530A (en
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张宏基
葛媛媛
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Yulin University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/0046—Devices for removing chips by sucking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/52—Magnesium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Milling Processes (AREA)

Abstract

The invention providesThe mechanical processing method for avoiding magnesium alloy magnesium chip combustion firstly according to the cutting depth value a of the processed partpDetermining the processing procedure of the magnesium alloy workpiece, and then determining the cutting speed v of the processing cutter according to the content of the processing procedurecA feeding speed vfHRA hardness of the cutter material, a front angle value of the cutter, a rear angle value of the cutter and the number of cutting edges of the cutter, and finally determining a recovery mode of magnesium chips. The magnesium chip recovery device can effectively avoid the burning of magnesium chips during the mechanical cutting processing of the magnesium alloy due to improper or unmatched selection of processing parameters, improves the processing efficiency of magnesium alloy workpieces, and simultaneously, the magnesium chips after the mechanical cutting processing can be well recovered and reused by adopting the magnesium chip recovery device.

Description

Mechanical processing method for avoiding magnesium alloy magnesium chips from burning
Technical Field
The invention relates to the field of magnesium alloy machining, in particular to a cutting process method for avoiding magnesium chip combustion during magnesium alloy machining during milling.
Background
The magnesium alloy is used as a metal material with a light structure, so that the energy is saved, the consumption is reduced, and the environment is greened. However, the magnesium alloy is applied to engineering practice as a structural member, and machining is inevitable. The traditional cutting method can cause the problems that magnesium chips are burnt due to overhigh temperature in the cutting process of the magnesium alloy structural part, and the magnesium alloy structural part is deformed and the quality of the processed surface is poor due to overlarge cutting force and cutting heat. The selection of proper cutting technological parameters, tool materials and a proper tool angle during cutting is a main method for avoiding magnesium chip burning during machining, and the cutting machining method is widely applied to the field of magnesium alloy machining due to the characteristics of high cutting machining efficiency, good surface quality, high precision and the like, while most of the prior art utilizes a cooling mode to prevent the burning of the magnesium chip during machining. There is no published literature that reports an effective method for preventing magnesium chips from burning during cutting. At present, the cooling liquid is used for preventing magnesium chips from burning during machining, so that the recycling of magnesium alloy is not utilized, and the cooling liquid can pollute the environment and is not beneficial to reducing the machining cost.
Disclosure of Invention
The invention aims to provide a mechanical processing method for avoiding magnesium chips of magnesium alloy from burning, and overcomes the defects that magnesium alloy can not be recycled due to the fact that magnesium chips are prevented from burning during mechanical processing by using cooling liquid and the environment is polluted due to the fact that the cooling liquid is used.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a mechanical processing method for avoiding magnesium alloy magnesium chips from burning, which comprises the following steps:
step 1: according to the cutting depth value a of the processed partpDetermining the processing procedure of the magnesium alloy workpiece:
when the cutting depth ap>When the thickness is 2mm, the processing procedure of the magnesium alloy workpiece is rough and finish machining; when the cutting depth is 0.5<apWhen the thickness is less than or equal to 2mm, the processing procedure of the magnesium alloy workpiece is a semi-finishing mode; when the cutting depth is less than or equal to 0.5mm, the processing procedure of the magnesium alloy workpiece is a finish machining mode;
step 2: determining the cutting speed v of the machining tool according to the process contentcA feeding speed vf；
And step 3: determining the HRA hardness of a machining cutter material, the front angle value of a cutter, the rear angle value of the cutter and the number of edges of the cutter according to the process content;
and 4, step 4: determining a recovery mode of magnesium chips during processing according to the process content;
and 5: and (3) carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter at the beginning of machining, and repeating the steps 1-4 according to the procedure scheme to finish the mechanical cutting machining of the magnesium alloy part.
Preferably, in step 2, the cutting speed v is set during rough machiningcThe value range of (a) is 1800 m/min-3200 m/min, the feeding speed vfThe value range is 600 mm/min-1000 mm/min;
in semi-finish machining, cutting speed vcHas a value range of 1200m/min to 1800m/min and a feeding speed vfThe value range is 300 mm/min-600 mm/min;
at the time of finish machining, the cutting speed vcHas a value range of 400-1200 m/min and a feeding speed vfThe value range is 100 mm/min-300 mm/min.
Preferably, in step 3, during rough machining, a tool with a hardness value of 80HRA or more, a rake angle value of 4 ° or more, a relief angle value of 10 ° or more and a number of cutting edges of 4 or less is used;
and in the semi-finishing and the finishing, a cutter with the hardness value of more than or equal to 90HRA, the rake angle value of more than or equal to 8 degrees, the relief angle value of more than or equal to 5 degrees and less than 10 degrees and the number of cutting edges of less than or equal to 2 is adopted.
Preferably, in the step 4, magnesium chips are naturally recovered during rough processing; and the magnesium chips are recovered by a special magnesium chip recovery device during semi-finishing and finishing.
Preferably, the magnesium chips recovery special device comprises a recovery cover, a recovery bent pipe, a blade fan and a motor, wherein the bottom surface of the recovery cover is provided with an air groove, the side wall of the recovery cover is provided with a recovery hole, and one side of the recovery hole is communicated with the air groove; the recovery return bend is the L type structure that the level was placed, and the one end of recovery return bend horizontal segment is connected with the opposite side of recovery hole, and the other end side of horizontal segment is passed through the blade fan and is connected with the motor.
Preferably, a protective cover for preventing chips from entering into the blade fan is arranged between the recovery elbow and the blade fan.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a mechanical processing method for avoiding magnesium alloy magnesium chips from burning, which comprises the following steps of firstly, cutting depth value a of a processed partpDetermining the processing procedure of the magnesium alloy workpiece, and then determining the cutting speed v of the processing cutter according to the content of the processing procedurecA feeding speed vfHRA hardness of the cutter material, a front angle value of the cutter, a rear angle value of the cutter and the number of cutting edges of the cutter, and finally determining a recovery mode of magnesium chips. The magnesium chip recovery device can effectively avoid the burning of magnesium chips during the mechanical cutting processing of the magnesium alloy due to improper or unmatched selection of processing parameters, improves the processing efficiency of magnesium alloy workpieces, and simultaneously, the magnesium chips after the mechanical cutting processing can be well recovered and reused by adopting the magnesium chip recovery device.
Furthermore, the magnesium chip recovery device drives the fan through the motor to generate suction, so that the flow speed of air on the surface of the workpiece can be increased, the magnesium chips can be rapidly sucked away, the cooling effect can be achieved, and the combustion of the magnesium chips can be well avoided.
Drawings
FIG. 1 is a schematic structural view of a special magnesium scrap recovery device;
FIG. 2 is a diagram showing the effect of the process of processing a magnesium alloy part by the processing method of the present application;
the device comprises a cutter 1, a cutter 2, a workpiece 3, a recovery cover 4, a first guide plate 5, a second guide plate 6, a recovery bent pipe 7, a protective cover 8, a blade fan 9 and a motor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a mechanical processing method for avoiding magnesium alloy magnesium chips from burning, which comprises the following steps:
step 1: according to the cutting depth value a of the processed partpDetermining the processing procedure of the magnesium alloy workpiece:
when the cutting depth ap>When the thickness is 2mm, the processing procedure of the magnesium alloy workpiece is rough and finish machining;
when the cutting depth is 0.5<apWhen the thickness is less than or equal to 2mm, the processing procedure of the magnesium alloy workpiece is a semi-finishing mode;
when the cutting depth is less than or equal to 0.5mm, the processing procedure of the magnesium alloy workpiece is a finish machining mode.
Step 2: the machining process parameter changeable according to the process content is determined as the cutting speed vcA feeding speed vf：
At the time of rough machining, the cutting speed vcThe value range of (a) is 1800 m/min-3200 m/min, the feeding speed vfThe value range is 600 mm/min-1000 mm/min;
in semi-finish machining, cutting speed vcHas a value range of 1200m/min to 1800m/min and a feeding speed vfThe value range is 300 mm/min-600 mm/min;
at the time of finish machining, the cutting speed vcHas a value range of 400-1200 m/min and a feeding speed vfThe value range is 100 mm/min-300 mm/min.
And step 3: determining the HRA hardness, the front angle value, the rear angle value and the blade number of the magnesium alloy part mechanical cutting processing cutter material according to the process content:
during rough machining, a cutter with a hardness value of more than or equal to 80HRA, a front angle value of more than or equal to 4 degrees, a rear angle value of more than or equal to 10 degrees and a blade number of less than or equal to 4 is adopted;
when in semi-finishing and finishing, a cutter with the hardness value of more than or equal to 90HRA, the front angle value of more than or equal to 8 degrees, the rear angle value of more than or equal to 5 degrees and less than 10 degrees and the number of blades of less than or equal to 2 is adopted;
and 4, step 4: determining a magnesium chip recovery mode during mechanical cutting machining of the magnesium alloy part according to the process content:
naturally recycling magnesium chips during rough machining;
the magnesium chips are recovered by a special device shown in the attached figure 1 during semi-finishing and finishing;
and 5: and (3) carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter at the beginning of machining, and repeating the steps 1-4 according to the procedure scheme to finish the mechanical cutting machining of the magnesium alloy part.
As shown in fig. 1, the special device for recycling magnesium chips comprises a motor 9, a blade fan 8, a protective cover 7, a recycling bent pipe 6, a first guide plate 4, a second guide plate 5, a recycling cover 3, a workpiece 2 and a cutter 1, wherein the number of the first guide plate 4 and the number of the second guide plate 5 are two, and the first guide plate 4 and the second guide plate 5 form a rectangular structure and are fixed on the bottom surface of the recycling cover 3 through hexagon socket head bolts; a gap is formed between the rectangular structure and the inner side wall of the recovery cover 3, and the gap is an air duct.
The recovery cover 3 is fixed on a machine tool workbench through an inner hexagon bolt; the recovery bent pipe 6 is connected with a recovery hole on the side plate of the recovery cover 3 in a sealing way; the protective cover 7, the motor 9 and the fan blades 8 are fixed on the threaded hole on the side surface of the recovery bent pipe 6 together by using bolts; the material of the recovery cover 3 is toughened glass, so that magnesium chips brought out by a cutter during mechanical processing can fall into an air groove along the smooth surface of the magnesium chips; the motor 9 continuously rotates to drive the fan blades 8 to continuously rotate to generate suction force, the generated suction force can suck the magnesium chips in the recovery cover 3 into the recovery bent pipe 6 and recover the magnesium chips through the lower hole of the recovery bent pipe 6, and the protective cover 7 is used for preventing the chips from entering the blade fans 8; the function of the air groove ensures that the magnesium chips can be smoothly sucked into the recovery bent pipe 6.
Before machining, the workpiece 2 is placed above the rectangular structure formed by the first guide plate 4 and the second guide plate 5.
According to the invention, through reasonable planning of the mechanical cutting process of the magnesium alloy workpiece, and by adopting the process methods of rough machining, semi-finish machining and finish machining, the burning of magnesium chips of the magnesium alloy during mechanical cutting and machining caused by improper or unmatched selection of machining parameters can be effectively avoided, and the machining efficiency of the magnesium alloy workpiece is improved. Simultaneously through adopting magnesium bits recovery unit for the realization that magnesium bits after the machining can be fine is retrieved and is recycled, and the suction that the device produced when processing man-hour moreover can accelerate the flow rate of workpiece surface air, can not only play and suck away the magnesium bits rapidly, but also can play refrigerated effect, can avoid the burning of magnesium bits well.
Example 1:
the method for cutting the magnesium alloy workpiece by using the face milling cutter as a cutting tool and avoiding chip combustion comprises the following steps:
step 1: depth of cut parameter a of machined partpThe thickness is 0.25mm, so the processing procedure of the magnesium alloy workpiece is a finish machining mode.
Step 2: determination of the cutting speed vcIs 1000m/min, the feed speed vfThe value is 200 mm/min.
And step 3: the hardness value of the cutter is determined to be 90HRA, the front angle is 10 degrees, the rear angle is 8 degrees, and the number of the cutter edges is 2.
Step 4: and a special device is adopted for recovery.
Step 5: and (3) carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter at the beginning of machining, and repeating the steps 1-4 according to the procedure scheme to finish the mechanical cutting machining of the magnesium alloy part.
Example 2
The same procedure as in example 1 was followed, except that:
step 2: determination of the cutting speed vcIs 400m/min, the feed speed vfThe value is 100 mm/min.
And step 3: the hardness value of the cutter is determined to be 90HRA, the front angle is 8 degrees, the rear angle is 5 degrees, and the number of the cutter edges is 1.
Example 3
The same procedure as in example 1 was followed, except that:
step 2: determination of the cutting speed vcIs 1200m/min, the feed speed vfThe value is 300 mm/min.
And step 3: the hardness value of the cutter is determined to be 100HRA, the front angle is 9 degrees, the rear angle is 10 degrees, and the cutter edge number is 1.
Example 4
The same procedure as in example 1 was followed, except that:
step 2: determination of the cutting speed vcIs 600m/min, the feed speed vfThe value is 250 mm/min.
And step 3: the hardness value of the cutter is determined to be 120HRA, the front angle is 9 degrees, the rear angle is 6 degrees, and the number of the cutter edges is 1.
Example 5:
in the embodiment, a face milling cutter is used as a cutting tool, and the specific cutting process method for avoiding chip burning of the magnesium alloy workpiece comprises the following steps:
step 1: depth of cut parameter a of machined partp2.5mm, the processing procedure of the magnesium alloy workpiece is a rough processing mode.
Step 2: determination of the cutting speed vcIs 2400m/min, and the feed speed vfThe value is 800 mm/min.
And step 3: the hardness value of the cutter is determined to be 80HRA, the front angle is 4 degrees, the rear angle is 10 degrees, and the cutter edge number is 4.
Step 4: and determining the recovery mode of the magnesium chips as a natural recovery mode.
Step 5: and (3) carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter at the beginning of machining, and repeating the steps 1-4 according to the procedure scheme to finish the mechanical cutting machining of the magnesium alloy part.
Example 6
The same procedure as in example 5 was followed, except that:
step 2: determination of the cutting speed vcIs 1800m/min, the feed speed vfThe value is 600 mm/min.
And step 3: the hardness value of the cutter is determined to be 90HRA, the front angle is 5 degrees, the rear angle is 12 degrees, and the cutter edge number is 3.
Example 7
The same procedure as in example 5 was followed, except that:
step 2: determination of the cutting speed vcIs 3200m/min, the feed speed vfThe value is 1000 mm/min.
Example 8
In the embodiment, a face milling cutter is used as a cutting tool, and the specific cutting process method for avoiding chip burning of the magnesium alloy workpiece comprises the following steps:
step 1: depth of cut parameter a of machined partp1mm, so the processing procedure of the magnesium alloy workpiece is a semi-finishing mode.
Step 2: determination of the cutting speed vcIs 1200m/min, the feed speed vfThe value is 300 mm/min.
And step 3: the hardness value of the cutter is determined to be 90HRA, the front angle is 8 degrees, the rear angle is 10 degrees, and the number of the cutting edges is 2.
Step 4: and determining the recovery mode of the magnesium chips as a natural recovery mode.
Step 5: and (3) carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter at the beginning of machining, and repeating the steps 1-4 according to the procedure scheme to finish the mechanical cutting machining of the magnesium alloy part.
As shown in fig. 2, when the magnesium alloy part is processed by the processing method of the present application, the magnesium chips are not burned in the processing.
Example 9
The same procedure as in example 8 was followed, except that:
step 2: determination of the cutting speed vcIs 1800m/min, the feed speed vfThe value is 600 mm/min.
And step 3: the hardness value of the cutter is determined to be 100HRA, the front angle is 10 degrees, the rear angle is 5 degrees, and the cutter edge number is 1.
Example 10
The same procedure as in example 8 was followed, except that:
step 2: determination of the cutting speed vcIs 1600m/min, the feed speed vfThe value is 400 mm/min.
Example 11
The same procedure as in example 8 was followed, except that:
step 2: determination of the cutting speed vcIs 1400m/min, the feed speed vfThe value is 500 mm/min.

Claims (2)

1. A mechanical processing method for avoiding magnesium alloy magnesium chips from burning is characterized by comprising the following steps:
step 1: according to the cutting depth value a of the processed partpDetermining the processing procedure of the magnesium alloy workpiece:
when cutting depth value ap>When the thickness is 2mm, the processing procedure of the magnesium alloy workpiece is rough and finish machining; when the cutting depth value is 0.5<apWhen the thickness is less than or equal to 2mm, the processing procedure of the magnesium alloy workpiece is a semi-finishing mode; when the cutting depth value is less than or equal to 0.5mm, the processing procedure of the magnesium alloy workpiece is a finish machining mode;
step 2: determining the cutting speed v of the machining tool according to the process contentcA feeding speed vf；
And step 3: determining the HRA hardness of a machining cutter material, the front angle value of a cutter, the rear angle value of the cutter and the number of edges of the cutter according to the process content;
and 4, step 4: determining a recovery mode of magnesium chips during processing according to the process content;
and 5: when machining is started, carrying out a tool setting procedure on the magnesium alloy part and a machine tool cutter, and repeating the steps 1-4 according to the procedure scheme to finish mechanical cutting machining on the magnesium alloy part;
in step 2, during rough machining, the cutting speed vcValue range ofIs 1800m/min to 3200m/min, and the feeding speed vfThe value range is 600 mm/min-1000 mm/min;
in semi-finish machining, cutting speed vcHas a value range of 1200m/min to 1800m/min and a feeding speed vfThe value range is 300 mm/min-600 mm/min;
at the time of finish machining, the cutting speed vcHas a value range of 400-1200 m/min and a feeding speed vfThe value range is 100 mm/min-300 mm/min;
in the step 3, during rough machining, a cutter with a hardness value of more than or equal to 80HRA, a front angle value of more than or equal to 4 degrees, a rear angle value of more than or equal to 10 degrees and a blade number of less than or equal to 4 is adopted;
when in semi-finishing and finishing, a cutter with the hardness value of more than or equal to 90HRA, the front angle value of more than or equal to 8 degrees, the rear angle value of more than or equal to 5 degrees and less than 10 degrees and the number of blades of less than or equal to 2 is adopted;
in the step 4, magnesium chips are naturally recovered during rough machining; during semi-finishing and finishing, magnesium chips are recovered by a special magnesium chip recovery device;
the magnesium scrap recovery special device comprises a recovery cover (3), a recovery bent pipe (6), a blade fan (8) and a motor (9), wherein the recovery cover (3) is fixed on a machine tool workbench, a workpiece (2) is placed in an inner cavity of the recovery cover (3), an air groove is formed in the bottom surface of the recovery cover (3), a recovery hole is formed in the side wall of the recovery cover (3), and one side of the recovery hole is communicated with the air groove; the recovery bent pipe (6) is of an L-shaped structure which is horizontally placed, one end of the horizontal section of the recovery bent pipe (6) is connected with the other side of the recovery hole, and the side face of the other end of the horizontal section is connected with the motor (9) through the blade fan (8); the motor (9) continuously rotates to drive the blade fan (8) to continuously rotate to generate suction force, and the generated suction force can suck the magnesium chips in the recovery cover (3) into the recovery elbow pipe (6) and recover the magnesium chips through the lower hole of the recovery elbow pipe (6).
2. The machining method for avoiding magnesium alloy magnesium chips from burning as claimed in claim 1, wherein: and a protective cover (7) used for preventing the cutting scraps from entering the blade fan (8) is arranged between the recovery elbow (6) and the blade fan (8).
CN201710262992.9A 2017-04-20 2017-04-20 Mechanical processing method for avoiding magnesium alloy magnesium chips from burning Active CN106994530B (en)

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CN113290419A (en) * 2021-06-26 2021-08-24 李兆灿 Visual magnesium alloy processingequipment

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CN102902855A (en) * 2012-09-28 2013-01-30 沈阳化工大学 Simulation technology-based method for optimizing cutting parameters of ceramic cutting tool
CN203171342U (en) * 2013-04-24 2013-09-04 成都标建铝业有限公司 Automatic air-cooling rotating disc type aluminium profile cutting machine
JP5734213B2 (en) * 2012-01-23 2015-06-17 三菱電機株式会社 High precision machining method and high precision machining apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101733461A (en) * 2008-11-12 2010-06-16 沈阳黎明航空发动机(集团)有限责任公司 Sectional rigid milling process for integrated impeller blade
CN101417342A (en) * 2008-12-03 2009-04-29 宝钢集团常州轧辊制造公司 High-hardness roller processing method
JP5734213B2 (en) * 2012-01-23 2015-06-17 三菱電機株式会社 High precision machining method and high precision machining apparatus
CN102902855A (en) * 2012-09-28 2013-01-30 沈阳化工大学 Simulation technology-based method for optimizing cutting parameters of ceramic cutting tool
CN203171342U (en) * 2013-04-24 2013-09-04 成都标建铝业有限公司 Automatic air-cooling rotating disc type aluminium profile cutting machine

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