CN112496688B - Camshaft processing method without positioning hole reference - Google Patents
Camshaft processing method without positioning hole reference Download PDFInfo
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- CN112496688B CN112496688B CN202011426573.2A CN202011426573A CN112496688B CN 112496688 B CN112496688 B CN 112496688B CN 202011426573 A CN202011426573 A CN 202011426573A CN 112496688 B CN112496688 B CN 112496688B
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- cam
- camshaft
- shaft
- cam shaft
- holes
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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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention relates to the field of cam shaft processing methods, in particular to a cam shaft processing method without a positioning hole reference. The cam shaft processing method comprises the following steps: A. firstly, drilling a center hole on the end face of a blank; B. then roughly turning the blank into the outline of the camshaft; C. milling the outline of the cam; D. then, the camshaft is subjected to integral carburization; E. then the carburized layer of the camshaft shaft body part is removed by turning; F. drilling a deep oil hole on the cam shaft; G. drilling an oil hole on a journal of a camshaft; H. quenching the whole camshaft; I. coarsely grinding the shaft neck of the cam shaft; J. finely turning two end surfaces of the cam shaft; K. processing bolt mounting holes and positioning holes on two end surfaces of a cam shaft by taking the cam as a reference; the invention optimizes the process flow, reduces the processing procedures and improves the processing efficiency. By measuring each cam, the optimal common reference is automatically calculated, the depth of the hardening layer of the cam profile is ensured to be uniform, and the service life of the cam shaft is prolonged.
Description
Technical Field
The invention relates to the field of cam shaft processing methods, in particular to a cam shaft processing method without a positioning hole reference.
Background
In the machining process of the carburized cam shaft, the cam profile is roughly machined, and positioning holes are required to be machined on two end faces of the cam shaft. At present, the locating hole is machined when the cam profile is roughly machined, and a rivet welding copper nail process is adopted later to prevent the influence of carburizing and quenching on the locating hole. In order to prevent the air in the positioning hole from being completely discharged, a small exhaust hole is drilled on the excircle of the cam journal, so that the positioning hole is prevented from being burst. The cam surface grinding allowance is greatly different, and the quenching depth of the cam surface is uneven. The locating hole needs protection when carburizing. If the positioning hole is welded, the local hardness of the weld scar is high, and when the end face of the camshaft is turned, the turning tool is intermittently turned, the turning tool is easy to collapse, and the service life of the tool is low.
Disclosure of Invention
In order to overcome the defect that two end surfaces of the existing camshaft need to be provided with positioning holes, the invention provides a camshaft processing method without positioning hole references.
The technical scheme adopted for solving the technical problems is as follows: a camshaft processing method without positioning hole reference comprises the following steps:
A. firstly, drilling a center hole on the end face of a blank;
B. then roughly turning the blank into the outline of the camshaft;
C. milling the outline of the cam;
D. then, the camshaft is subjected to integral carburization;
E. then the carburized layer of the camshaft shaft body part is removed by turning;
F. drilling a deep oil hole on the cam shaft;
G. drilling an oil hole on a journal of a camshaft;
H. quenching the whole camshaft;
I. coarsely grinding the shaft neck of the cam shaft;
J. finely turning two end surfaces of the cam shaft;
K. processing bolt mounting holes and positioning holes on two end surfaces of a cam shaft by taking the cam as a reference;
l, grinding and processing cam profiles of the cam shafts according to the positioning holes processed on the cam;
m, finely grinding the shaft neck of the cam shaft;
and N, detecting the finished camshaft.
According to another embodiment of the present invention, the method further includes step G, firstly measuring the position of a cam on the cam shaft under the machine coordinate system, then calculating the positions of the oil holes of the journals according to the angles of the cam, and processing the oil holes of the journals.
According to another embodiment of the present invention, the method further includes the step K of measuring the position of each cam on the cam shaft under the machine tool coordinate system, calculating the theoretical position of the locating hole corresponding to each cam according to the angle of each cam, adding the theoretical positions of the locating holes on all cams, dividing by the number of cams to obtain the ideal theoretical position coordinates of the locating hole with consistent grinding allowance of each cam, and drilling and rough boring the locating hole according to the coordinates. And measuring the position degree of the positioning hole after rough boring by taking the flange or the shaft neck where the positioning hole is positioned as a reference, compensating the center coordinates of the positioning hole according to the difference between the measured value and the theoretical value, and finely boring the positioning hole and each bolt mounting hole by taking the center coordinates of the compensated positioning hole as a workpiece coordinate system.
The invention has the advantages of optimizing the process flow, reducing the processing procedures and improving the processing efficiency. By measuring each cam, the optimal common reference is automatically calculated, the depth of the hardening layer of the cam profile is ensured to be uniform, and the service life of the cam shaft is prolonged.
Detailed Description
A camshaft processing method without positioning hole reference comprises the following steps:
A. firstly, drilling a center hole on the end face of a blank;
B. then roughly turning the blank into the outline of the camshaft;
C. milling the outline of the cam;
D. then, the camshaft is subjected to integral carburization;
E. then the carburized layer of the camshaft shaft body part is removed by turning;
F. drilling a deep oil hole on the cam shaft;
G. drilling an oil hole on a journal of a camshaft;
H. quenching the whole camshaft;
I. coarsely grinding the shaft neck of the cam shaft;
J. finely turning two end surfaces of the cam shaft;
K. processing bolt mounting holes and positioning holes on two end surfaces of a cam shaft by taking the cam as a reference;
l, grinding and processing cam profiles of the cam shafts according to the positioning holes processed on the cam;
m, finely grinding the shaft neck of the cam shaft;
and N, detecting the finished camshaft.
In the step G, firstly, the position of a cam on a cam shaft under a machine tool coordinate system is measured, and then the positions of oil holes of the shaft journals are calculated according to the angle of the cam, and the oil holes of the shaft journals are machined.
In the step K, firstly, the position of each cam on the cam shaft under a machine tool coordinate system is measured, then the theoretical position of a locating hole corresponding to each cam is calculated according to the angle of each cam, finally, the theoretical positions of the locating holes on all cams are added and divided by the number of the cams, and the ideal theoretical position coordinate of the locating hole with consistent grinding allowance of each cam is obtained, and the locating hole is drilled and rough bored according to the coordinate. And measuring the position degree of the positioning hole after rough boring by taking the flange or the shaft neck where the positioning hole is positioned as a reference, compensating the center coordinates of the positioning hole according to the difference between the measured value and the theoretical value, and finely boring the positioning hole and each bolt mounting hole by taking the center coordinates of the compensated positioning hole as a workpiece coordinate system.
Claims (2)
1. A camshaft processing method without a positioning hole reference is characterized by comprising the following steps:
A. firstly, drilling a center hole on the end face of a blank;
B. then roughly turning the blank into the outline of the camshaft;
C. milling the outline of the cam;
D. then, the camshaft is subjected to integral carburization;
E. then the carburized layer of the camshaft shaft body part is removed by turning;
F. drilling a deep oil hole on the cam shaft;
G. drilling an oil hole on a journal of a camshaft;
H. quenching the whole camshaft;
I. coarsely grinding the shaft neck of the cam shaft;
J. finely turning two end surfaces of the cam shaft;
K. processing bolt mounting holes and positioning holes on two end surfaces of a cam shaft by taking the cam as a reference;
l, grinding and processing cam profiles of the cam shafts according to the positioning holes processed on the cam;
m, finely grinding the shaft neck of the cam shaft;
n, detecting a finished camshaft;
in the step K, firstly, the position of each cam on a cam shaft under a machine tool coordinate system is measured, then the theoretical position of a locating hole corresponding to each cam is calculated according to the angle of each cam, finally, the theoretical positions of the locating holes on all cams are added and divided by the number of cams to obtain the ideal theoretical position coordinates of the locating holes with consistent grinding allowance of each cam, the locating holes are drilled and rough bored according to the coordinates, the position degree of the locating holes after rough boring is measured by taking the flange or the shaft neck where the locating holes are positioned as a reference, the circular center coordinates of the locating holes are compensated according to the difference between the measured value and the theoretical value, and the finish boring of the locating holes and the bolt mounting holes is carried out by taking the circular center coordinates of the compensated locating holes as a workpiece coordinate system.
2. The method for machining a camshaft without a pilot hole as defined in claim 1, wherein in the step G, first, a position of a cam on the camshaft in a machine coordinate system is measured, and then, positions of oil holes of journals are calculated according to angles of the cam, and the oil holes of the journals are machined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426573.2A CN112496688B (en) | 2020-12-09 | 2020-12-09 | Camshaft processing method without positioning hole reference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426573.2A CN112496688B (en) | 2020-12-09 | 2020-12-09 | Camshaft processing method without positioning hole reference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112496688A CN112496688A (en) | 2021-03-16 |
| CN112496688B true CN112496688B (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011426573.2A Active CN112496688B (en) | 2020-12-09 | 2020-12-09 | Camshaft processing method without positioning hole reference |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113601119B (en) * | 2021-08-13 | 2023-03-17 | 陕西柴油机重工有限公司 | Machining method for high-power diesel engine camshaft |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6473964B1 (en) * | 2000-01-12 | 2002-11-05 | Keystone Investment Corporation | Method of fabricating camshafts |
| CN102091936A (en) * | 2011-01-24 | 2011-06-15 | 青岛淄柴博洋柴油机股份有限公司 | Method for processing crankshaft oil holes |
| CN102179729A (en) * | 2011-04-13 | 2011-09-14 | 南车戚墅堰机车有限公司 | Online camshaft measuring and machining process |
| CN102189376A (en) * | 2011-03-22 | 2011-09-21 | 南车戚墅堰机车有限公司 | Novel cam shaft machining process |
| CN202114585U (en) * | 2011-06-01 | 2012-01-18 | 安徽金光机械集团股份有限公司 | Special cam grinding fixture of cam shaft |
| CN104233315A (en) * | 2013-06-14 | 2014-12-24 | 无锡市森信精密机械厂 | Technology for preventing grinding crack of carburizing camshaft |
-
2020
- 2020-12-09 CN CN202011426573.2A patent/CN112496688B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6473964B1 (en) * | 2000-01-12 | 2002-11-05 | Keystone Investment Corporation | Method of fabricating camshafts |
| CN102091936A (en) * | 2011-01-24 | 2011-06-15 | 青岛淄柴博洋柴油机股份有限公司 | Method for processing crankshaft oil holes |
| CN102189376A (en) * | 2011-03-22 | 2011-09-21 | 南车戚墅堰机车有限公司 | Novel cam shaft machining process |
| CN102179729A (en) * | 2011-04-13 | 2011-09-14 | 南车戚墅堰机车有限公司 | Online camshaft measuring and machining process |
| CN202114585U (en) * | 2011-06-01 | 2012-01-18 | 安徽金光机械集团股份有限公司 | Special cam grinding fixture of cam shaft |
| CN104233315A (en) * | 2013-06-14 | 2014-12-24 | 无锡市森信精密机械厂 | Technology for preventing grinding crack of carburizing camshaft |
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| CN112496688A (en) | 2021-03-16 |
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