CN111408755B - Multi-coaxial high-precision deep hole machining method for box type movable assembly - Google Patents

Multi-coaxial high-precision deep hole machining method for box type movable assembly Download PDF

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Publication number
CN111408755B
CN111408755B CN202010242828.3A CN202010242828A CN111408755B CN 111408755 B CN111408755 B CN 111408755B CN 202010242828 A CN202010242828 A CN 202010242828A CN 111408755 B CN111408755 B CN 111408755B
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box body
coaxial
hole
deep hole
pin
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CN111408755A (en
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王琪
张安顺
黄景康
王丰
罗广权
朱宇轲
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Chengdu Aircraft Industrial Group Co Ltd
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Chengdu Aircraft Industrial Group Co Ltd
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)

Abstract

The application relates to the technical field of coaxial hole machining and discloses a method for machining a multi-coaxial high-precision deep hole of a box type movable assembly. The method comprises the steps of prefabricating a primary hole in a single part machining state, respectively positioning and connecting a bracket, a box upper cover and a box base by means of the primary hole, assembling the bracket, the box upper cover and the box base into a box assembly by using a step pin, fixing the box assembly on a special tool, and then respectively pulling out the step pin to start boring a coaxial hole of the box assembly. The processing difficulties that the position relation of parts in the box type movable assembly is not fixed, the number of coaxial holes of the assembly is large, the hole depth is large and the like are fully considered, and the coaxiality and the position relation of multiple holes can be simultaneously guaranteed during processing, so that the processing precision and the product quality of the box type movable assembly are improved.

Description

Multi-coaxial high-precision deep hole machining method for box type movable assembly
Technical Field
The invention relates to the technical field of coaxial hole machining, in particular to a method for machining a multi-coaxial high-precision deep hole of a box type movable assembly.
Background
The box type movable assembly is usually formed by matching a plurality of parts based on one or more coaxial holes, each independent part is provided with a positioning hole and various guide holes which are assembled and positioned with other mechanisms, the positioning hole and the guide hole have high requirements on size precision and shape precision, the positioning hole and the guide hole have hole position matching requirements with other parts, and particularly when the assembly is provided with a plurality of high-precision coaxial holes, the assembly has higher requirements on the processing quality of part holes.
At present, the processing method of the coaxial hole mainly aims at the processing of a single coaxial hole of a fixed connection assembly, and the processing modes mainly comprise two modes, namely, the coaxial hole is respectively processed in place under the processing state of a single part and then assembled into the assembly; and the other method is that after other parts of the part are machined, the parts are fixedly connected to form an assembly, and the coaxial holes of the assembly are machined. The first method is suitable for machining a single coaxial hole of the assembly, and the second method is suitable for machining a coaxial hole of the fixed connection assembly. Therefore, the traditional coaxial hole machining method is not suitable for the machining occasion of multiple coaxial deep holes of the movable assembly.
Disclosure of Invention
In order to overcome the problems and the defects in the prior art, the invention provides a multi-coaxial high-precision deep hole machining method which is particularly suitable for box type movable assemblies according to the structural characteristics and the clamping characteristics of the box type movable assemblies.
In order to achieve the above object, the technical solution of the present invention is as follows:
a method for machining a multi-coaxial high-precision deep hole of a box type movable assembly specifically comprises the following steps:
s1, respectively prefabricating coaxial deep hole primary holes on a bracket, a box upper cover and a box base in a single part machining state;
s2, on the basis of the coaxial deep hole primary hole, positioning and connecting the bracket and the upper cover of the box body by using a first threaded pin and a second threaded pin;
s3, processing bracket auxiliary positioning holes on the bracket and the upper cover of the box body, keeping the positions of the bracket and the upper cover of the box body still, positioning and connecting the bracket and the upper cover of the box body by using a universal pin, and taking down the first threaded pin and the second threaded pin;
s4, on the basis of the primary hole of the coaxial deep hole, a first step pin and a second step pin are used for positioning and connecting the upper cover of the box body and the base of the box body, and the bracket, the upper cover of the box body and the base of the box body are assembled into a box body assembly;
s5, processing auxiliary positioning holes of the box body base on the box body upper cover and the box body base, keeping the positions of the box body upper cover and the box body base still, positioning and connecting the box body upper cover and the box body base by using a universal pin to complete clamping and positioning of parts, and assembling the bracket, the box body upper cover and the box body base into a box body assembly;
s6, clamping the box body assembly on a special tool for the box body by means of the first step pin and the second step pin, and fixing the special tool on a machine tool workbench to complete clamping and positioning of the assembly;
s7, pulling out the first step pin, bidirectionally boring a first coaxial deep hole of the box body assembly on two sides, and inserting a positioning pin into the first coaxial deep hole;
s8, pulling out the second step pin, and bidirectionally boring a second coaxial deep hole of the box body assembly on the two sides.
Preferably, the first threaded pin and the second threaded pin have the same structure and respectively comprise a threaded section and a pin section, the outer diameter of the pin section is slightly smaller than the aperture of the prefabricated coaxial deep hole initial hole, and the length of the pin section is slightly larger than the hole depth of the coaxial deep holes of the bracket and the box body upper cover.
Preferably, the positions of the bracket auxiliary positioning holes and the box body base auxiliary positioning holes include, but are not limited to, the peripheries of the coaxial deep hole initial holes, and the number of the auxiliary positioning holes on the periphery of each coaxial deep hole initial hole is not less than 2.
Preferably, the first stepped pin and the second stepped pin have the same structure and respectively comprise a section a, a section b and a section c, the outer diameter of the section a is not smaller than the aperture of the coaxial deep hole, the outer diameter of the section b is slightly smaller than the aperture of the initial hole of the coaxial deep hole, and the outer diameter of the section c is smaller than the outer diameter of the section b.
Preferably, when the box assembly is clamped on the special tool for the box, the a sections of the first step pin and the second step pin are matched with the tool positioning hole, and the c section is matched with the bushing in the tool positioning hole.
Preferably, in step S7, the specific method for boring the first coaxial deep hole of the box assembly includes: and pulling out the first stepped pin, performing rotation error compensation on the machine tool, selecting a boring cutter with proper specification according to the size of the coaxial deep hole, installing the boring cutter on the machine tool, boring the first coaxial deep hole by a two-sided two-way method, boring the hole from the front side of the box body assembly, wherein the depth of the first boring hole is slightly larger than half of the total length of the first coaxial deep hole, rotating the box body assembly by 180 degrees, continuously boring the first coaxial deep hole on the back side of the box body assembly, and the depth of the second boring hole is slightly larger than half of the total length of the first coaxial deep hole.
Preferably, in the step S8, the method for boring the second coaxial deep hole of the box assembly is the same as that for boring the first coaxial deep hole in the step S7.
The beneficial effect of this application:
the processing difficulties that the position relation of parts is not fixed, the number of coaxial holes of the assemblies is large, the hole depth is large and the like in the box type movable assembly are fully considered, the processing method for boring the coaxial deep holes respectively after primary hole prefabrication and secondary hole positioning connection is provided, therefore, the multi-hole coaxiality and the position relation can be guaranteed simultaneously in the processing process, the processing precision and the product quality of the box type movable assembly are improved, the processing efficiency can also be improved, and a plurality of coaxial deep holes of the box type movable assembly can be processed efficiently and rapidly.
Drawings
FIG. 1 is a schematic structural view of a box-like movable assembly;
FIG. 2 is a schematic view of the connection and positioning of the bracket and the upper cover of the box body;
FIG. 3 is a schematic view of the connection and positioning of the bracket, the upper cover of the box body and the base of the box body;
fig. 4 is a schematic view of a stepped pin structure.
In the drawings:
1. a bracket; 2. the box body is covered; 3. a base of the box body; 4. a first threaded pin; 5. a second threaded pin; 6. auxiliary positioning holes of the bracket; 7. a first step pin; 8. a second step pin; 9. auxiliary positioning holes of the box body base.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Referring to the accompanying drawings 2, 3 and 4 in the specification, the embodiment discloses a multi-coaxial high-precision deep hole machining method for a box type movable assembly, which comprises the following specific operation steps:
s1, respectively prefabricating coaxial deep hole primary holes on a bracket 1, a box body upper cover 2 and a box body base 3 in a single part machining state;
s2, based on a coaxial deep hole primary hole, respectively placing a first threaded pin 4 and a second threaded pin 5 into the primary hole, and positioning and connecting the bracket 1 and the box body upper cover 2;
s3, processing a bracket auxiliary positioning hole 6 on the bracket 1 and the box body upper cover 2, keeping the positions of the bracket 1 and the box body upper cover 2 still, placing a universal pin into the bracket auxiliary positioning hole 6 for positioning and connecting the bracket 1 and the box body upper cover 2, and simultaneously taking down the first threaded pin 4 and the second threaded pin 5;
s4, further, based on the coaxial deep hole primary hole, placing a first stepped pin 7 and a second stepped pin 8 into the coaxial deep hole primary hole respectively for positioning and connecting the box body upper cover 2 and the box body base 3, and assembling the bracket 1, the box body upper cover 2 and the box body base 3 into a box body assembly;
s5, processing auxiliary positioning holes 9 of the box body base on the box body upper cover 2 and the box body base 3, keeping the positions of the box body upper cover 2 and the box body base 3 still, placing universal pins into the auxiliary positioning holes 9 of the box body base to complete clamping and positioning of parts, and assembling the bracket 1, the box body upper cover 2 and the box body base 3 into a box body assembly;
s6, clamping the box body assembly on a special tool for the box body by means of a first step pin 7 and a second step pin 8, wherein the special tool is fixed on a machine tool workbench to complete clamping and positioning of the assembly;
s7, pulling out the first step pin 7, bidirectionally boring a first coaxial deep hole of the box body assembly on two sides, and inserting a positioning pin into the first coaxial deep hole;
s8, pulling out the second step pin 8, and bidirectionally boring the second coaxial deep hole of the box body assembly on the two sides.
Further, the first threaded pin 4 and the second threaded pin 5 are identical in structure and comprise a threaded section and a pin section, the outer diameter of the pin section is slightly smaller than the aperture of the prefabricated coaxial deep hole initial hole, and the length of the pin section is slightly larger than the hole depth of the coaxial deep holes of the bracket 1 and the box body upper cover 2.
Further, the positions of the bracket auxiliary positioning hole 6 and the box body base auxiliary positioning hole 9 include, but are not limited to, the peripheries of the primary coaxial deep holes, and the number of the auxiliary positioning holes around each primary coaxial deep hole is not less than 2, so that the shift of hole positions during the processing of the coaxial deep holes can be avoided, and the coaxiality of each coaxial deep hole and the relative position relationship of the plurality of coaxial deep holes are ensured.
Further, referring to fig. 4 in the specification, the first stepped pin 7 and the second stepped pin 8 have the same structure, and each of the first stepped pin and the second stepped pin includes three sections a, b, and c, where an outer diameter of the section a is not smaller than an aperture of a coaxial deep hole, an outer diameter of the section b is slightly smaller than an aperture of a primary hole of the coaxial deep hole, and an outer diameter of the section c is smaller than an outer diameter of the section b.
Further, when clamping the box body assembly on the special tool for the box body, the section a of the first stepped pin 7 and the section a of the second stepped pin 8 are matched with the tool positioning hole, and the section c is matched with the bush in the tool positioning hole, so that the box body assembly can be guaranteed to have good strength and rigidity when a coaxial deep hole is machined.
Further, in step S7, the specific method of boring the first coaxial deep hole of the box assembly includes: the first stepped pin 7 is pulled out, a first coaxial deep hole is bored by a two-sided two-way method, before the two-way boring, rotation error compensation is carried out on a machine tool, the rotation error compensation is used for ensuring the cylindricity and the coaxiality of the coaxial deep hole, so that the size precision and the shape precision of a product are improved, a boring cutter with a proper specification is selected according to the size of the coaxial deep hole and is installed on the machine tool, during machining, the hole is bored from the front side of the box body assembly firstly, the depth of the first boring hole is slightly larger than half of the total length of the first coaxial deep hole, then the box body assembly is rotated by 180 degrees, the first coaxial deep hole is bored continuously on the back side of the box body assembly, and the depth of the second boring hole is slightly larger than half of the total length of the first coaxial deep hole.
Further, in the step S8, the method for boring the second coaxial deep hole of the box assembly is the same as that for boring the first coaxial deep hole in the step S7.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.
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 method for machining a multi-coaxial high-precision deep hole of a box type movable assembly is characterized by comprising the following steps of: the method specifically comprises the following steps:
s1, respectively prefabricating coaxial deep hole primary holes on a bracket (1), a box body upper cover (2) and a box body base (3) in a single part machining state;
s2, on the basis of the coaxial deep hole initial hole, the bracket (1) and the box body upper cover (2) are connected in a positioning mode through a first threaded pin (4) and a second threaded pin (5);
s3, processing a bracket auxiliary positioning hole (6) on the bracket (1) and the box body upper cover (2), keeping the positions of the bracket (1) and the box body upper cover (2) stationary, positioning and connecting the bracket (1) and the box body upper cover (2) by using a universal pin, and taking down the first threaded pin (4) and the second threaded pin (5);
s4, on the basis of the primary hole of the coaxial deep hole, a first stepped pin (7) and a second stepped pin (8) are used for positioning and connecting the box body upper cover (2) and the box body base (3), and the bracket (1), the box body upper cover (2) and the box body base (3) are assembled into a box body assembly;
s5, processing auxiliary box body base positioning holes (9) in the upper box body cover (2) and the base box body (3), keeping the upper box body cover (2) and the base box body (3) in fixed positions, positioning and connecting the upper box body cover (2) and the base box body (3) through universal pins to complete clamping and positioning of parts, and assembling the bracket (1), the upper box body cover (2) and the base box body (3) into a box body assembly;
s6, clamping the box body assembly on a special tool for the box body by means of a first step pin (7) and a second step pin (8), wherein the special tool is fixed on a machine tool workbench to complete clamping and positioning of the assembly;
s7, pulling out the first step pin (7), bidirectionally boring a first coaxial deep hole of the box body assembly on two sides, and inserting a positioning pin into the first coaxial deep hole;
s8, pulling out the second step pin (8), and bidirectionally boring the second coaxial deep hole of the box body assembly on the two sides.
2. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 1, wherein the method comprises the following steps: the first threaded pin (4) and the second threaded pin (5) are identical in structure and respectively comprise a threaded section and a pin section, the outer diameter of the pin section is slightly smaller than the aperture of the primary hole of the prefabricated coaxial deep hole, and the length of the pin section is slightly larger than the hole depth of the coaxial deep holes of the bracket (1) and the box body upper cover (2).
3. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 1, wherein the method comprises the following steps: the bracket auxiliary positioning holes (6) and the box body base auxiliary positioning holes (9) are formed in the periphery of the primary coaxial deep holes, and the number of the auxiliary positioning holes in the periphery of each primary coaxial deep hole is not less than 2.
4. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 1, wherein the method comprises the following steps: the first stepped pin (7) and the second stepped pin (8) are identical in structure and respectively comprise a section a, a section b and a section c, the outer diameter of the section a is not smaller than the aperture of the coaxial deep hole, the outer diameter of the section b is slightly smaller than the aperture of the initial hole of the coaxial deep hole, and the outer diameter of the section c is smaller than the outer diameter of the section b.
5. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 4, wherein the method comprises the following steps: when clamping the box body assembly on the special tool for the box body, the a section of the first step pin (7) and the second step pin (8) is matched with the tool positioning hole, and the c section is matched with the bush in the tool positioning hole.
6. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 1, wherein the method comprises the following steps: in the step S7, a specific method for boring the first coaxial deep hole of the box assembly includes: and pulling out the first stepped pin (7), compensating the rotation error of the machine tool, selecting a boring cutter with proper specification according to the size of the coaxial deep hole, installing the boring cutter on the machine tool, boring the first coaxial deep hole by a two-sided two-way method, boring the hole from the front side of the box body assembly, boring the hole with the depth slightly larger than half of the total length of the first coaxial deep hole for the first time, rotating the box body assembly by 180 degrees, continuously boring the first coaxial deep hole on the back side of the box body assembly, and boring the hole with the depth slightly larger than half of the total length of the first coaxial deep hole for the second time.
7. The method for machining the multi-coaxial high-precision deep hole of the box type movable assembly according to claim 6, wherein the method comprises the following steps: in the step S8, the method for boring the second coaxial deep hole of the box body assembly is the same as that for boring the first coaxial deep hole in the step S7.
CN202010242828.3A 2020-03-31 2020-03-31 Multi-coaxial high-precision deep hole machining method for box type movable assembly Active CN111408755B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109715A (en) * 1981-03-07 1983-06-08 Honda Motor Co Ltd Method and machine tool for machining valve seat surface
SU1468677A1 (en) * 1986-02-17 1989-03-30 Л. М. Натапов и М. Д. Медведев Method of machining coaxial holes
CN101456133A (en) * 2007-12-10 2009-06-17 洛阳双瑞精铸钛业有限公司 Method for machining and forging titanium alloy box and auxiliary clamping tool
CN101829917A (en) * 2010-05-12 2010-09-15 孙效 Boring fixture for small box body
CN103551856A (en) * 2013-09-30 2014-02-05 沈阳黎明航空发动机(集团)有限责任公司 Machining method for preventing high-precision large titanium alloy thin-wall casting mounting edge deformation
CN103639436A (en) * 2013-12-06 2014-03-19 中捷机床有限公司 Detachable horizontal machining centre spindle box and manufacturing method
CN105479123A (en) * 2016-02-04 2016-04-13 山东富源履带机械有限公司 Tool for machining box and machining technology of tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109715A (en) * 1981-03-07 1983-06-08 Honda Motor Co Ltd Method and machine tool for machining valve seat surface
SU1468677A1 (en) * 1986-02-17 1989-03-30 Л. М. Натапов и М. Д. Медведев Method of machining coaxial holes
CN101456133A (en) * 2007-12-10 2009-06-17 洛阳双瑞精铸钛业有限公司 Method for machining and forging titanium alloy box and auxiliary clamping tool
CN101829917A (en) * 2010-05-12 2010-09-15 孙效 Boring fixture for small box body
CN103551856A (en) * 2013-09-30 2014-02-05 沈阳黎明航空发动机(集团)有限责任公司 Machining method for preventing high-precision large titanium alloy thin-wall casting mounting edge deformation
CN103639436A (en) * 2013-12-06 2014-03-19 中捷机床有限公司 Detachable horizontal machining centre spindle box and manufacturing method
CN105479123A (en) * 2016-02-04 2016-04-13 山东富源履带机械有限公司 Tool for machining box and machining technology of tool

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