CN110948184A - Machining process method for extruding high-precision mandrel of spark plug shell - Google Patents
Machining process method for extruding high-precision mandrel of spark plug shell Download PDFInfo
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- CN110948184A CN110948184A CN201911233329.1A CN201911233329A CN110948184A CN 110948184 A CN110948184 A CN 110948184A CN 201911233329 A CN201911233329 A CN 201911233329A CN 110948184 A CN110948184 A CN 110948184A
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- machining process
- mandrel
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- grinding
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- 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
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- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/50—Other automobile vehicle parts, i.e. manufactured in assembly lines
Abstract
The invention relates to and belongs to the field of machine tool machining, and discloses a machining process method for extruding a high-precision mandrel of a spark plug shell, which comprises the following steps of blanking; a time control vehicle: turning the shape according to the target size of the mandrel, and respectively putting the grinding amount of 0.10-0.12mm on the diameter of each excircle; processing the screw thread, the tool withdrawal groove and the center holes at two ends according to the target size of the product; primary center processing: correcting the workpiece, and milling opposite sides, fixing grooves and positioning holes; heat treatment; turning; grinding the outer circle, controlling turning for two times, processing the secondary center, cutting and polishing. According to the machining process disclosed by the invention, the obtained high-precision mandrel for the extruded spark plug shell has higher dimensional precision and the advantage of high product qualification rate, can be uniformly stressed in use, avoids the phenomenon of serious abrasion caused by low dimensional precision, and can obviously prolong the service life of the mandrel.
Description
Technical Field
The invention belongs to the field of machine tool machining, and particularly relates to a machining process method for extruding a high-precision mandrel of a spark plug shell.
Background
With the development of the automobile industry, the market demand of the automobile spark plug is rapidly increased, and the requirement of the production process of the spark plug as an important element of an engine ignition device is very strict, wherein the shell of the spark plug is used as a main body part of the whole spark plug assembly, the standardized production is important, and the manufacturing process of the shell of the spark plug is usually produced by using a cold extrusion technology, so a high-precision extrusion mandrel is required.
In the existing production process of the mandrel, the manufactured mandrel has uneven manufacturing precision, the production quality is influenced, the quality is poor, and the rejection rate is high; in use, the wear is often serious, the durability cannot meet the production requirement, the extrusion equipment is easily damaged, and the standardized production management of enterprises cannot be carried out.
Disclosure of Invention
The invention aims to provide a machining process method for extruding a high-precision mandrel of a spark plug shell aiming at the current processing and using situations of the mandrel of the spark plug shell.
In order to achieve the purpose, the invention provides a machining process method for extruding a high-precision mandrel of a spark plug shell, which comprises the following steps of:
(1) blanking;
(2) a time control vehicle: turning the shape according to the target size of the mandrel, and respectively putting the grinding amount of 0.10-0.12mm on the diameter of each excircle; and (3) processing the threads, the tool withdrawal groove and the center holes at two ends according to the target size of the product: firstly, processing the appearance of the left end, turning a large excircle to the right end, milling two surfaces at a position which does not influence the necessary size of the left end, making an auxiliary screwing surface, turning around and clamping an auxiliary tool, taking a minimum shaft as a positioning reference, screwing the auxiliary screwing surface in a threaded connection mode, and turning all the appearances of the right end;
(3, performing center processing for one time, namely correcting the workpiece, and milling opposite sides, fixing grooves and positioning holes;
(4) and (3) heat treatment: carrying out vacuum heat treatment to reach target hardness;
(5) turning: grinding center holes at two ends;
(6) grinding the excircle: grinding the excircle of the two top points, and grinding the rough machining length allowance in the step (2) to a target size;
(7) controlling the vehicle for two times: taking the end face as a reference, screwing the thread part, and turning all outer circles and length sizes of the right end;
(8) secondary center processing: positioning a correction workpiece, and drilling to meet the drawing requirement;
(9) wire cutting: cutting the groove to the dimension required by the drawing by taking the surface as a reference;
(10) polishing: polishing each profile to the roughness requirement and target polishing chamfer.
Preferably, the method comprises checking whether the machining sizes of the step (2) and the step (3) are in accordance with the requirements before the heat treatment, and correcting the machining sizes which are not in accordance with the requirements.
Preferably, before the step (10), checking whether all dimensions meet the requirements according to tolerance requirements, and correcting machined dimensions.
Preferably, the vacuum heat treatment in step (4) has a target hardness of 58-62 HRC.
Preferably, the blanking of step (1) is performed by blanking bar stock to a mandrel process target size or directly purchasing a blank stock of the target size.
Preferably, the indexing head clamping tool is used for correcting the workpiece in the step (3).
Preferably, the step (7) is performed by using an auxiliary tool.
Preferably, the indexing head is used for clamping the tool in the step (8) to position and correct the workpiece.
Preferably, step (9) is performed with the aid of a positioning tool.
Preferably, the method comprises checking whether the machining sizes of the step (2) and the step (3) are in accordance with the requirements before the heat treatment, and correcting the machining sizes which are not in accordance with the requirements. According to the machining process, the steps of blanking, primary numerical control turning, primary center machining, heat treatment, turning, excircle grinding, secondary number of times of turning, secondary center machining, linear cutting and polishing are adopted, and the specific process steps are matched, so that the obtained high-precision mandrel for the extruded spark plug shell has high dimensional precision and the advantage of high product percent of pass, can be uniformly stressed in use, avoids the phenomenon of serious abrasion caused by low dimensional precision, and can obviously prolong the service life of the mandrel.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, top, outer, inner" and the like included in a term merely represent the orientation of the term in a conventional use state or are colloquially known by those skilled in the art, and should not be construed as limiting the term.
The invention provides a machining process method for extruding a high-precision mandrel of a spark plug shell, which comprises the following steps of:
(1) blanking;
(2) a time control vehicle: turning the shape according to the target size of the mandrel, and respectively putting the grinding amount of 0.10-0.12mm on the diameter of each excircle; and (3) processing the threads, the tool withdrawal groove and the center holes at two ends according to the target size of the product: firstly, processing the appearance of the left end, turning a large excircle to the right end, milling two surfaces at a position which does not influence the necessary size of the left end, making an auxiliary screwing surface, turning around and clamping an auxiliary tool, taking a minimum shaft as a positioning reference, screwing the auxiliary screwing surface in a threaded connection mode, and turning all the appearances of the right end;
(3) a primary processing center: correcting the workpiece, and milling opposite sides, fixing grooves and positioning holes;
(4) and (3) heat treatment: carrying out vacuum heat treatment to reach target hardness;
(5) turning: grinding center holes at two ends;
(6) grinding the excircle: grinding the excircle of the two top points, and grinding the rough machining length allowance in the step (2) to a target size;
(7) controlling the vehicle for two times: taking the end face as a reference, screwing the thread part, and turning all outer circles and length sizes of the right end;
(8) secondary machining center: positioning a correction workpiece, and drilling to meet the drawing requirement;
(9) wire cutting: cutting the groove to the dimension required by the drawing by taking the surface as a reference;
(10) polishing: polishing each profile to the roughness requirement and target polishing chamfer.
In a preferred embodiment of the present invention, the method comprises checking whether the machined dimensions of step (2) and step (3) are satisfactory before the heat treatment, and correcting the unsatisfactory machined dimensions. According to the machining process, the steps of blanking, primary numerical control turning, primary center machining, heat treatment, turning, excircle grinding, secondary number of times of turning, secondary center machining, linear cutting and polishing are adopted, and the specific process steps are matched, so that the obtained high-precision mandrel for the extruded spark plug shell has high dimensional precision and the advantage of high product percent of pass, can be uniformly stressed in use, avoids the phenomenon of serious abrasion caused by low dimensional precision, and can obviously prolong the service life of the mandrel.
In order to further improve the machining precision of the mandrel, improve the production efficiency and improve the yield, in a preferred embodiment of the invention, before the step (10), whether all dimensions meet the requirements or not is checked according to tolerance requirements, and the machined dimensions are corrected.
In order to further improve the wear resistance of the mandrel and extend the service life of the mandrel, in a preferred embodiment of the invention, the vacuum heat treatment in step (4) has a target hardness of 58-62 HRC.
In a preferred embodiment of the invention, the blanking in step (1) is performed by blanking bar stock to a target size for the mandrel process or by directly purchasing a blank stock of the target size.
In order to further improve the machining precision of the mandrel, improve the production efficiency and improve the yield, in a preferred embodiment of the invention, the indexing head clamping tool is used for correcting the workpiece in the step (3).
In order to further improve the machining precision of the mandrel, improve the production efficiency and improve the yield, in a preferred embodiment of the invention, the step (7) uses an auxiliary tool for positioning.
In order to further improve the machining precision of the mandrel, improve the production efficiency and improve the yield, in a preferred embodiment of the invention, the indexing head clamping tool is used for positioning and correcting the workpiece in the step (8).
In order to further improve the machining precision of the mandrel, improve the production efficiency and improve the yield, in a preferred embodiment of the invention, the step (9) is carried out with the aid of a positioning tool.
The tool can be a conventional positioning tool in the field, and the invention has no requirement on the specific form, and the technical effect of the invention can be realized as long as the positioning or calibration requirement of the invention can be realized. Again, no further description is given.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A machining process method for extruding a high-precision mandrel of a spark plug shell is characterized by comprising the following steps of:
(1) blanking;
(2) a time control vehicle: turning the shape according to the target size of the mandrel, and respectively putting the grinding amount of 0.10-0.12mm on the diameter of each excircle; and (3) processing the threads, the tool withdrawal groove and the center holes at two ends according to the target size of the product: firstly, processing the appearance of the left end, turning a large excircle to the right end, milling two surfaces at a position which does not influence the necessary size of the left end, making an auxiliary screwing surface, turning around and clamping an auxiliary tool, taking a minimum shaft as a positioning reference, screwing the auxiliary screwing surface in a threaded connection mode, and turning all the appearances of the right end;
(3) primary center processing: correcting the workpiece, and milling opposite sides, fixing grooves and positioning holes;
(4) and (3) heat treatment: carrying out vacuum heat treatment to reach target hardness;
(5) turning: grinding center holes at two ends;
(6) grinding the excircle: grinding the excircle of the two top points, and grinding the rough machining length allowance in the step (2) to a target size;
(7) controlling the vehicle for two times: taking the end face as a reference, screwing the thread part, and turning all outer circles and length sizes of the right end;
(8) secondary center processing: positioning a correction workpiece, and drilling to meet the drawing requirement;
(9) wire cutting: cutting the groove to the dimension required by the drawing by taking the surface as a reference;
(10) polishing: polishing each profile to the roughness requirement and target polishing chamfer.
2. The machining process of claim 1, wherein the method comprises checking whether the machined dimensions of step (2) and step (3) are satisfactory before the heat treatment, and correcting the unsatisfactory machined dimensions.
3. The machining process of claim 1, further comprising checking all dimensions for tolerance requirements and correcting machined dimensions before performing step (10).
4. The machining process of claim 1, wherein the vacuum heat treatment in step (4) has a target hardness of 58-62 HRC.
5. The machining process of claim 1, wherein the blanking of step (1) is performed by blanking bar stock to a mandrel process target size or directly purchasing a blank stock of a target size.
6. The machining process method according to claim 1, wherein the indexing head clamping tool is used for correcting the workpiece in the step (3).
7. The machining process method according to claim 1, wherein the positioning in the step (7) is performed by using an auxiliary tool.
8. The machining process method according to claim 1, wherein the indexing head clamping tool is used for positioning and correcting the workpiece in the step (8).
9. The machining process of claim 1, wherein step (9) is carried out with the aid of a positioning tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911233329.1A CN110948184A (en) | 2019-12-05 | 2019-12-05 | Machining process method for extruding high-precision mandrel of spark plug shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911233329.1A CN110948184A (en) | 2019-12-05 | 2019-12-05 | Machining process method for extruding high-precision mandrel of spark plug shell |
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| Publication Number | Publication Date |
|---|---|
| CN110948184A true CN110948184A (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911233329.1A Pending CN110948184A (en) | 2019-12-05 | 2019-12-05 | Machining process method for extruding high-precision mandrel of spark plug shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116100264A (en) * | 2023-03-13 | 2023-05-12 | 华侨大学 | Manufacturing process of miniature pin shaft |
Citations (5)
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| CN102335709A (en) * | 2011-08-19 | 2012-02-01 | 江苏森威精锻有限公司 | Machining technology for inner race housing die abnormal-shaped punch |
| CN102672061A (en) * | 2012-04-28 | 2012-09-19 | 重庆市江津区宏盛机械制造有限公司 | Punch machining process |
| CN103028895A (en) * | 2011-10-09 | 2013-04-10 | 烟台金王礼品有限公司 | Manufacturing technology of punching head special for spring seat |
| CN103785992A (en) * | 2012-10-31 | 2014-05-14 | 常州市翰琪电机有限公司 | Air cylinder head bolt machining process |
| CN105196004A (en) * | 2015-10-27 | 2015-12-30 | 衡阳纺织机械有限公司 | Method for machining bearing mandrel provided with key grooves in two ends |
-
2019
- 2019-12-05 CN CN201911233329.1A patent/CN110948184A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335709A (en) * | 2011-08-19 | 2012-02-01 | 江苏森威精锻有限公司 | Machining technology for inner race housing die abnormal-shaped punch |
| CN103028895A (en) * | 2011-10-09 | 2013-04-10 | 烟台金王礼品有限公司 | Manufacturing technology of punching head special for spring seat |
| CN102672061A (en) * | 2012-04-28 | 2012-09-19 | 重庆市江津区宏盛机械制造有限公司 | Punch machining process |
| CN103785992A (en) * | 2012-10-31 | 2014-05-14 | 常州市翰琪电机有限公司 | Air cylinder head bolt machining process |
| CN105196004A (en) * | 2015-10-27 | 2015-12-30 | 衡阳纺织机械有限公司 | Method for machining bearing mandrel provided with key grooves in two ends |
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| 董玉玺: "数控车床编程实例分析 ", 《科技信息》 * |
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| CN116100264A (en) * | 2023-03-13 | 2023-05-12 | 华侨大学 | Manufacturing process of miniature pin shaft |
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Application publication date: 20200403 |