CN116038244A - Internal thread extrusion method for high-strength aluminum alloy material - Google Patents
Internal thread extrusion method for high-strength aluminum alloy material Download PDFInfo
- Publication number
- CN116038244A CN116038244A CN202211518672.2A CN202211518672A CN116038244A CN 116038244 A CN116038244 A CN 116038244A CN 202211518672 A CN202211518672 A CN 202211518672A CN 116038244 A CN116038244 A CN 116038244A
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- alloy material
- extrusion
- strength aluminum
- threaded hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention provides a high-strength aluminum alloy material internal thread extrusion method, which comprises the following steps of S1: forming a bottom hole in a preset position of the workpiece, wherein the diameter of the bottom hole is 0.94mm-1.15mm larger than that of the pre-machined threaded hole; s2: selecting an extrusion tap with a required specification and fixing the extrusion tap on a machine tool; s3: taking extrusion special oil as a lubricating medium, setting the rotating speed of a machine tool to be 100r/min-600r/min, and processing threads on a bottom hole to form a threaded hole at the feeding speed of 200 mm/min; s4: and detecting the threaded hole. According to the invention, through extrusion processing, the residual stress of the workpiece after the processing is finished is improved, so that the wear resistance and fatigue resistance of the workpiece are improved, the service life of the workpiece is prolonged, and the separator is prevented from cracking in the use process.
Description
Technical Field
The invention belongs to the field of machining, and particularly relates to an internal thread extrusion method for a high-strength aluminum alloy material.
Background
The upper crankcase of the high-power diesel engine is made of high-strength cast aluminum alloy materials, a threaded structure is required to be manufactured and processed at all partition plates of the upper crankcase for fastening a bearing cover to compress the crankshaft, and the quality of the threaded structure at the partition plates of the upper crankcase directly influences the service life of the upper crankcase due to the large load applied at the position. In the test process of the engine bench, the crack accident occurs at the upper crankcase baffle plate, one of the crack reasons is that the thread structure at the upper crankcase baffle plate is formed by cutting, so that the metal at the position has lower fatigue resistance and wear resistance, under the vibration working condition caused by long-term working of the engine, the swing of the bolt in the screw hole is larger, the stress and the abrasion to the screw hole are larger, the service life of the baffle plate is reduced, and the baffle plate is cracked.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for extruding internal threads of high-strength aluminum alloy materials, so as to improve the thread strength and prolong the service life of the partition board.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
an internal thread extrusion method for high-strength aluminum alloy material comprises the following steps of
S1: forming a bottom hole in a preset position of the workpiece, wherein the diameter of the bottom hole is 0.94mm-1.15mm larger than that of the pre-machined threaded hole;
s2: selecting an extrusion tap with a required specification and fixing the extrusion tap on a machine tool;
s3: taking extrusion special oil as a lubricating medium, setting the rotating speed of a machine tool to be 100r/min-600r/min, and processing threads on a bottom hole to form a threaded hole at the feeding speed of 200 mm/min;
s4: and detecting the threaded hole.
Further, in S1 the bottom hole diameter is 1.15mm larger than the pre-machined threaded hole diameter.
Further, in S3, the rotational speed of the machine tool is 240r/min.
Further, in S2, the tool is clamped to the machine tool by using a flexible clamp.
Further, in S1, the roughness of the bottom hole processing is ra1.6.
Further, in S4, the threaded hole is detected by a threaded plug gauge.
Further, in S4, the bolt is repeatedly rotated in the screw hole, and detection is performed with the standard that the bolt is not deformed after being screwed in and the bolt deflection is small.
Compared with the prior art, the method for extruding the internal threads of the high-strength aluminum alloy material has the following advantages:
according to the invention, through extrusion processing, the residual stress of the workpiece after the processing is finished is improved, so that the wear resistance and fatigue resistance of the workpiece are improved, the service life of the workpiece is prolonged, and the separator is prevented from cracking in the use process;
by arranging the bottom hole with the diameter slightly larger than that of the threaded hole on the workpiece, when the threaded hole is extruded, the hole wall of the bottom hole can move towards the center of the hole after being extruded, the processed size is compensated, and the precision of the threaded hole is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of an extrusion thread processing step;
FIG. 2 is a graph of the internal stress test point after machining;
FIG. 3 is an enlarged view after cutting the thread;
fig. 4 is an enlarged view after the extrusion thread cutting.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention relates to an internal thread extrusion method of a high-strength aluminum alloy material, which is shown in figure 1 and comprises the following steps of
S1: in the research and development process of the invention, the diameter of the preset machining screw hole is 11.9mm, in the experiment, the bottom holes with three diameters of phi 12.84mm, phi 13.1mm and phi 13.05mm are used as experimental contrast and machined, and the M14 screw thread with the diameter of 13.05mm is found to have the best detection result, and the roughness of the bottom hole is Ra1.6, so that the diameter of the bottom hole is more preferably larger than 1.15mm of the diameter of the pre-machining screw hole, and the hole wall of the bottom hole can move towards the center of the hole after being extruded in the extrusion machining process of the screw hole, thereby compensating the machining size and improving the precision of the screw hole.
S2: selecting a extruding tap with required specification, fixing the extruding tap on a machine tool through a flexible chuck.
S3: taking extrusion special oil as a lubricating medium, setting the rotating speed of a machine tool to be 100r/min-600r/min and the feeding speed to be 200mm/min, and processing threads on a bottom hole to form a threaded hole, wherein in the research process of the invention, experiments are carried out according to the rotating speed of 100r/min, the feeding speed of 200mm/min, the rotating speed of 240r/min, the feeding speed of 200mm/min, the rotating speed of 600r/min and the feeding speed of 200mm/min respectively, and the processing results of the rotating speed of 240r/min and the feeding speed of 200mm/min are optimal according to an experimental structure;
s4: the screw hole is detected, the screw hole is detected through a plug gauge of M14, or the screw hole is repeatedly rotated through a bolt with corresponding size, no setback is felt after the bolt is screwed in, and the bolt swing difference is smaller as a standard.
In the research process, in order to facilitate obtaining experimental data, the invention compares the cut thread with the method recorded in the invention, experiments are carried out in the same experimental material, then the threaded hole is cut, and the processed thread profile is compared, so that the U-shaped extruded thread crest bearing after dissection can be seen, and the roughness of the extruded crest is poorer than that of the cut crest; in order to further acquire the processed workpiece data, residual stress detection is performed on the processed workpiece, and 10 points are selected on the cutting surface of the workpiece to perform metal internal stress detection as shown in fig. 2, wherein the detection results are shown in the following table:
as can be seen from the table, the residual stress is detected, the average value of the residual stress of the extrusion thread is up to-37 MPa, the average value of the cutting thread is up to-12 MPa, and the residual stress of the extrusion thread is higher as the inspection result, so that the extrusion thread has higher wear resistance and metal fatigue resistance.
Meanwhile, the actual detection of the matching of the screw bolt and the screw hole formed by different processing modes is carried out, the detection results are shown in the following table,
extrusion bottom hole data
From this, it was found that the thread formed by extrusion had a smaller run out after the machining than the thread formed by cutting, in the same way as the threaded hole with the machining specification m18×1.5.
In summary, the processing method of the optimal high-strength aluminum alloy material threaded hole is as follows:
the foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. An internal thread extrusion method of a high-strength aluminum alloy material is characterized by comprising the following steps of: comprising
S1: forming a bottom hole in a preset position of the workpiece, wherein the diameter of the bottom hole is 0.94mm-1.15mm larger than that of the pre-machined threaded hole;
s2: selecting an extrusion tap with a required specification and fixing the extrusion tap on a machine tool;
s3: taking extrusion special oil as a lubricating medium, setting the rotating speed of a machine tool to be 100r/min-600r/min, and processing threads on a bottom hole to form a threaded hole at the feeding speed of 200 mm/min;
s4: and detecting the threaded hole.
2. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: the bottom hole diameter is 1.15mm greater than the pre-machined threaded hole diameter in S1.
3. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: in S3, the rotating speed of the machine tool is 240r/min.
4. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: and S2, clamping the cutter on the machine tool by adopting a flexible clamp.
5. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: in S1, the roughness of the bottom hole processing is ra1.6.
6. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: in S4, the threaded hole is detected by a threaded plug gauge.
7. The method for extruding high-strength aluminum alloy material internal threads as recited in claim 1, wherein: in S4, the bolt is repeatedly rotated in the screw hole, and detection is performed with the standard that the bolt is screwed in and then has no jerk and the bolt runout is small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211518672.2A CN116038244A (en) | 2022-11-30 | 2022-11-30 | Internal thread extrusion method for high-strength aluminum alloy material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211518672.2A CN116038244A (en) | 2022-11-30 | 2022-11-30 | Internal thread extrusion method for high-strength aluminum alloy material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116038244A true CN116038244A (en) | 2023-05-02 |
Family
ID=86115510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211518672.2A Pending CN116038244A (en) | 2022-11-30 | 2022-11-30 | Internal thread extrusion method for high-strength aluminum alloy material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116038244A (en) |
-
2022
- 2022-11-30 CN CN202211518672.2A patent/CN116038244A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116038244A (en) | Internal thread extrusion method for high-strength aluminum alloy material | |
| CN104640656A (en) | Cutting tool gripping tool | |
| CN213858196U (en) | Workpiece fixing and clamping device for machine tool | |
| CN211163035U (en) | Clamp for gear shaft groove milling | |
| CN114178800B (en) | Titanium alloy thin-wall hemisphere processing method | |
| CN215941704U (en) | Reamer for processing multistage inner holes | |
| CN113399947B (en) | Pulley bracket machining clamp and machining method | |
| CN113600847A (en) | Lightweight large-diameter boring cutter and machining method thereof | |
| CN210849320U (en) | Lathe fixture for boring and chamfering spring ring parts | |
| CN114273947A (en) | Clamp and machining process thereof | |
| CN110712006A (en) | Method for machining elliptical hole at small end of connecting rod | |
| CN218964684U (en) | Prevent milling cutter in fracture for numerical control lathe | |
| CN201346647Y (en) | Adjustable clamp for sawing cup connection rod | |
| CN218364082U (en) | Thin-wall part plane grinding and clamping tool | |
| CN220680093U (en) | Marine diesel engine oil pan processing frock | |
| CN216325174U (en) | Hydraulic cylinder turning cutter bar | |
| CN216151123U (en) | Lightweight major diameter boring cutter | |
| CN213496745U (en) | Multifunctional device for sectioning and milling special-shaped cylindrical part | |
| CN115055921A (en) | Process method for strengthening bimetal machining surface of bottom hole of engine crankshaft | |
| CN220050885U (en) | Tensioning clamp for thin-wall cylindrical workpiece | |
| CN210232263U (en) | Engine pressure plate processing clamping fixture | |
| CN220480931U (en) | Depth-adjustable tool clamp for tungsten ring machining | |
| CN219617197U (en) | Special tool for machining special-shaped thin-wall part | |
| CN214723396U (en) | Thread insert machining clamp | |
| CN214558804U (en) | Inner hole rolling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |