CN114295036A - Grinding precision testing method for hot die forging connecting rod bearing bush - Google Patents
Grinding precision testing method for hot die forging connecting rod bearing bush Download PDFInfo
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- CN114295036A CN114295036A CN202111392579.7A CN202111392579A CN114295036A CN 114295036 A CN114295036 A CN 114295036A CN 202111392579 A CN202111392579 A CN 202111392579A CN 114295036 A CN114295036 A CN 114295036A
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- connecting rod
- reference surface
- pressure pin
- welding
- bearing bush
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- 238000005242 forging Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 title claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000003754 machining Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000007689 inspection Methods 0.000 description 4
- 238000010009 beating Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Abstract
The invention discloses a method for testing the grinding precision of a hot die forging connecting rod bearing bush, which comprises the following steps: s1, before machining, welding a welding block at the position, close to the pressure pin, of the side face of each connecting rod, welding the two welding blocks in parallel, and machining the outer surfaces of the two welding blocks to be parallel to the central line of the shaft hole of the pressure pin to serve as a detection reference surface; processing a reference surface on two sides of the top of the two connecting rods, enabling the reference surface to be parallel to the central line of the pressure pin shaft hole and serving as another detection reference surface; s2, when the connecting rod bearing bush is ground, the magnetic gauge stand is respectively fixed at two detection reference positions, the gauge head of the dial indicator is pressed on the arc surface of the pressure pin, the dial indicator is moved, and whether the grinding precision of the connecting rod bearing bush meets the requirement or not can be judged by calculating the indicating number difference value of the dial indicator at the two positions. The invention can detect the parallelism of the pressure pin and the connecting rod bearing bush at any time in the grinding process, improves the efficiency, reduces the labor intensity and saves a large amount of cost in the process of manufacturing the hot die forging press.
Description
Technical Field
The invention belongs to the technical field of hot die forging presses, and particularly relates to a grinding precision testing method for a hot die forging connecting rod bearing bush.
Background
The hot die forging press is a high-precision forming device, is characterized by high forging precision, high production efficiency and easy formation of automation, and is a main production device for forging products in large batch at present. The manufacturing accuracy of the press is influenced by a number of aspects, wherein the accuracy of the pressure pin and the connecting rod is particularly critical. The contact rate of a connecting rod bearing bush and a pressure pin needs to be more than 75%, the axial line of the pressure pin and the axial line of the connecting rod need to be ensured to be parallel after grinding, and the inspection method of the latter usually depends on experience, and after grinding to a certain degree, the connecting rod bearing bush and the pressure pin are returned to a machine tool to check whether the parallelism meets the requirement or not; if the requirements are not met, the grinding needs to be carried out again, so that the grinding is continued again in the assembly plant, the steps are repeated, not only is the machine tool occupied, but also the repeated workload is generated, and the grinding time is all dependent on experience. Or the pressure pin shaft is arranged for inspection, so that time and labor are wasted, and the economic cost is high.
Disclosure of Invention
The invention aims to solve the problems existing in the prior art and provides a grinding precision inspection method for a hot die forging connecting rod bearing bush.
The invention is realized in this way, a method for testing the grinding precision of a hot die forging connecting rod bearing bush comprises the following steps:
s1, before machining, welding a welding block at the position, close to the pressure pin, of the side face of each connecting rod, welding the two welding blocks in parallel, and machining the outer surfaces of the two welding blocks to be parallel to the central line of the shaft hole of the pressure pin to serve as a detection reference surface;
and processing a reference surface on two sides of the top of the two connecting rods, and enabling the reference surface to be parallel to the central line of the pressure pin shaft hole and serve as another detection reference surface.
S2, when the connecting rod bearing bush is ground, the magnetic gauge stand is respectively fixed at two detection reference positions of a detection reference surface on the outer surface of the welding block and a detection reference surface at the top of the connecting rod, the head of the dial indicator is pressed on the arc surface of the pressure pin, the dial indicator is moved, and whether the grinding precision of the connecting rod bearing bush meets the requirement or not can be judged by calculating the difference value of the readings of the dial indicator at the two positions.
In the above technical solution, preferably, the detection reference surface of the top of the connecting rod is a horizontal reference surface, and is not in the same direction as the detection reference surface of the outer surface of the solder bump.
In the above technical solution, preferably, the position of the solder bump is close to the highest point of the circular arc surface of the pressure pin.
The invention has the advantages and positive effects that:
in the grinding process of the pressure pin and the bearing bush, the inspection method saves time and cost of a large amount of reciprocating operation in the prior art, and does not occupy other equipment, such as a crown block, a machine tool and the like; the parallelism of the pressure pin and the connecting rod bearing bush can be detected at any time in the grinding process, the problems in the grinding process are avoided, the efficiency is improved, the labor intensity is reduced, and a large amount of cost is saved in the process of manufacturing the hot die forging press.
Drawings
Fig. 1 is a schematic structural diagram of a grinding precision test of a hot die forging connecting rod bearing shell provided by an embodiment of the invention.
In the figure: 1. a connecting rod; 2. a pressure pin; 3. welding blocks; 4. a magnetic watch base; 5. and (4) a dial indicator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, the present embodiment provides a method for inspecting grinding accuracy of a bearing shell of a hot die forging connecting rod, including the following steps:
s1, before machining, welding a welding block 3 at the position, close to the pressure pin 2, of the side face of each of the two connecting rods 1, welding the two welding blocks 3 in parallel, enabling the position of each welding block 3 to be close to the highest point of the arc face of the pressure pin 2 as much as possible, and machining the outer surfaces of the two welding blocks 3 to be parallel to the central line of the shaft hole of the pressure pin 2 to serve as a detection reference surface;
and processing one reference surface on two sides of the top of the two connecting rods 1 to enable the reference surface to be parallel to the central line of the shaft hole of the pressure pin 2 and serve as the other detection reference surface. The detection reference surface at the top of the connecting rod 1 is a horizontal reference surface and is not in the same direction with the detection reference surface on the outer surface of the welding block 3.
S2, when the connecting rod 1 bearing bush is ground, the magnetic gauge stand 4 is respectively fixed at two detection reference positions of a detection reference surface on the outer surface of the welding block 3 and a detection reference surface at the top of the connecting rod 1, the gauge head of the dial indicator 5 is pressed on the arc surface of the pressure pin 2, the dial indicator 5 is moved, and whether the grinding precision of the connecting rod 1 bearing bush meets the requirement or not can be judged by calculating the difference value of the readings of the dial indicator 5 at the two positions.
The specific working process of the invention is as follows:
before machining, welding two welding blocks 3 on the side surfaces of the two connecting rods 1 in advance, wherein the welding position is as close to the highest point of the arc surface of the pressure pin 2 as possible, and two reference surfaces are machined on the two top surfaces of the bodies of the two connecting rods 1 to increase detection references; and guarantee the positional relation precision with the axis of pressure pin 2, two welding block 3 outer surfaces are processed to be parallel with the axis of pressure pin 2, connecting rod 1 top surface is processed to be parallel with the axis of pressure pin 2, the detection reference surface of connecting rod 1 top surface is horizontal reference surface, is not in same direction with the detection reference surface of welding block 3 outer surface, guarantees like this that the alignment benchmark of two directions can both satisfy.
In the assembling process, when the bearing bush of the connecting rod 1 is ground, the parallelism between the pressure pin 2 and the axis of the bearing bush of the connecting rod 1 is detected at any time by using the reference of two positions; specifically, the magnetic gauge stand 4 is fixed at the detection reference, the gauge head of the dial indicator 5 is pressed on the arc surface of the pressure pin 2, the dial indicator 5 is moved, the pointer indication of the dial indicator 5 is observed and recorded, the grinding degree of the pressure pin 2 and the bearing bush of the connecting rod 1 can be judged by comparing the numerical values of two positions and the same reference, if the numerical values do not meet the requirement, the grinding is continued, and vice versa.
The traditional method needs to grind to a certain degree, the machine tool is required to be subjected to surface beating detection, the grinding time is totally dependent on experience, and if the machine tool is unqualified in surface beating, the grinding is returned to continue, so that the operation is time-consuming and labor-consuming. By the detection method, the parallelism of the grinding machine can be detected at any time in the grinding process, the efficiency is improved, and a large amount of cost is saved in the process of manufacturing the hot die forging press machine.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. A method for testing the grinding precision of a hot die forging connecting rod bearing bush is characterized by comprising the following steps:
s1, before machining, welding a welding block at the position, close to the pressure pin, of the side face of each connecting rod, welding the two welding blocks in parallel, and machining the outer surfaces of the two welding blocks to be parallel to the central line of the shaft hole of the pressure pin to serve as a detection reference surface;
processing a reference surface on two sides of the top of the two connecting rods, enabling the reference surface to be parallel to the central line of the pressure pin shaft hole and serving as another detection reference surface;
s2, when the connecting rod bearing bush is ground, the magnetic gauge stand is respectively fixed at two detection reference positions of a detection reference surface on the outer surface of the welding block and a detection reference surface at the top of the connecting rod, the head of the dial indicator is pressed on the arc surface of the pressure pin, the dial indicator is moved, and whether the grinding precision of the connecting rod bearing bush meets the requirement or not can be judged by calculating the difference value of the readings of the dial indicator at the two positions.
2. The method for inspecting the grinding precision of the bearing shell of the hot die forging connecting rod as claimed in claim 1, wherein the detection reference surface of the top of the connecting rod is a horizontal reference surface and is not in the same direction as the detection reference surface of the outer surface of the welding block.
3. The method for inspecting the grinding precision of the bearing shell of the hot die forging connecting rod as claimed in claim 1, wherein the position of the welding block is close to the highest point of the circular arc surface of the pressure pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392579.7A CN114295036A (en) | 2021-11-23 | 2021-11-23 | Grinding precision testing method for hot die forging connecting rod bearing bush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392579.7A CN114295036A (en) | 2021-11-23 | 2021-11-23 | Grinding precision testing method for hot die forging connecting rod bearing bush |
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| CN114295036A true CN114295036A (en) | 2022-04-08 |
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| CN202111392579.7A Pending CN114295036A (en) | 2021-11-23 | 2021-11-23 | Grinding precision testing method for hot die forging connecting rod bearing bush |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202204501U (en) * | 2011-08-29 | 2012-04-25 | 机科发展科技股份有限公司 | Bearing bush radius projection degree and parallelism automatic detection device |
| CN102607433A (en) * | 2012-02-24 | 2012-07-25 | 中国计量学院 | Multi-point detection device for thickness of bearing bush |
| CN203385375U (en) * | 2013-07-24 | 2014-01-08 | 重庆斯凯迪轴瓦有限公司 | Bearing shell parallelism measuring instrument |
| CN203981152U (en) * | 2014-07-09 | 2014-12-03 | 恩比贝克飞虹汽车零部件(四川)有限公司 | High and the parallelism detecting device of bearing bush radius projection |
| CN204788232U (en) * | 2015-07-17 | 2015-11-18 | 湖南省卓尔轴瓦科技有限公司 | Digital axle bush automatic checkout device based on singlechip |
| CN106839934A (en) * | 2017-02-09 | 2017-06-13 | 十堰汉高机电科技股份有限公司 | A kind of bearing shell height and cambered surface precision measure machine |
| CN208443325U (en) * | 2018-06-05 | 2019-01-29 | 亚洲创建（河源）木业有限公司 | A kind of defibrator process moving plate survey surface depth of parallelism device |
| CN209673022U (en) * | 2019-05-07 | 2019-11-22 | 中原内配集团轴瓦股份有限公司 | Bearing shell lateral ends arrangement for measuring verticality |
| CN111002215A (en) * | 2019-12-31 | 2020-04-14 | 朱慧 | Full-automatic grinding equipment for inner ring of split bearing bush workpiece |
| CN113108745A (en) * | 2021-03-29 | 2021-07-13 | 中船重工重庆智能装备工程设计有限公司 | Bearing bush radius height and alignment parallelism detection device |
| CN113267113A (en) * | 2021-05-18 | 2021-08-17 | 重庆齿轮箱有限责任公司 | Method for testing assembly precision of radial sliding bearing |
-
2021
- 2021-11-23 CN CN202111392579.7A patent/CN114295036A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202204501U (en) * | 2011-08-29 | 2012-04-25 | 机科发展科技股份有限公司 | Bearing bush radius projection degree and parallelism automatic detection device |
| CN102607433A (en) * | 2012-02-24 | 2012-07-25 | 中国计量学院 | Multi-point detection device for thickness of bearing bush |
| CN203385375U (en) * | 2013-07-24 | 2014-01-08 | 重庆斯凯迪轴瓦有限公司 | Bearing shell parallelism measuring instrument |
| CN203981152U (en) * | 2014-07-09 | 2014-12-03 | 恩比贝克飞虹汽车零部件(四川)有限公司 | High and the parallelism detecting device of bearing bush radius projection |
| CN204788232U (en) * | 2015-07-17 | 2015-11-18 | 湖南省卓尔轴瓦科技有限公司 | Digital axle bush automatic checkout device based on singlechip |
| CN106839934A (en) * | 2017-02-09 | 2017-06-13 | 十堰汉高机电科技股份有限公司 | A kind of bearing shell height and cambered surface precision measure machine |
| CN208443325U (en) * | 2018-06-05 | 2019-01-29 | 亚洲创建（河源）木业有限公司 | A kind of defibrator process moving plate survey surface depth of parallelism device |
| CN209673022U (en) * | 2019-05-07 | 2019-11-22 | 中原内配集团轴瓦股份有限公司 | Bearing shell lateral ends arrangement for measuring verticality |
| CN111002215A (en) * | 2019-12-31 | 2020-04-14 | 朱慧 | Full-automatic grinding equipment for inner ring of split bearing bush workpiece |
| CN113108745A (en) * | 2021-03-29 | 2021-07-13 | 中船重工重庆智能装备工程设计有限公司 | Bearing bush radius height and alignment parallelism detection device |
| CN113267113A (en) * | 2021-05-18 | 2021-08-17 | 重庆齿轮箱有限责任公司 | Method for testing assembly precision of radial sliding bearing |
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