阅读说明：本技术 一种缸盖燃烧室在线补偿加工方法 (Online compensation machining method for cylinder cover combustion chamber ) 是由 阮春霞 王理想 陈正伟 朱奇林 梅勇 毛锋 于 2021-08-13 设计创作，主要内容包括：本发明提供了一种缸盖燃烧室在线补偿加工方法,其包括以下步骤：步骤S1：检测各燃烧室中的燃烧室凸台与缸盖火力面在竖直方向上的高度,并计算其平均值；若该平均值不在该高度的理论值的设定范围内,则不进行加工；反之,则进行下一步加工；步骤S2：计算该平均值与该理论值之间的差值,在保证缸盖顶面与燃烧室凸台在竖直方向上的距离为设计距离的情况下,确定缸盖顶面需要铣削的深度,进行缸盖顶面的加工；步骤S3：在缸盖顶面加工完成后,以缸盖顶面作为机床中加工程序编制坐标系时的基准；根据缸盖顶面与缸盖火力面在竖直方向上的理论距离,确定缸盖火力面需要铣削的深度,进行缸盖火力面的铣削。本发明能够较好地实现对燃烧室的容积的控制。(The invention provides an online compensation processing method of a cylinder cover combustion chamber, which comprises the following steps: step S1: detecting the height of a combustion chamber boss in each combustion chamber and the height of a cylinder cover firepower surface in the vertical direction, and calculating the average value of the heights; if the average value is not within the set range of the theoretical value of the height, the processing is not carried out; otherwise, carrying out the next processing; step S2: calculating the difference between the average value and the theoretical value, determining the milling depth of the top surface of the cylinder cover under the condition of ensuring that the distance between the top surface of the cylinder cover and a boss of a combustion chamber in the vertical direction is a designed distance, and processing the top surface of the cylinder cover; step S3: after the top surface of the cylinder cover is machined, the top surface of the cylinder cover is used as a reference for compiling a coordinate system in a machining process; according to the theoretical distance between the top surface of the cylinder cover and the fire surface of the cylinder cover in the vertical direction, the depth of the fire surface of the cylinder cover to be milled is determined, and the fire surface of the cylinder cover is milled. The invention can better realize the control of the volume of the combustion chamber.)

1. An online compensation processing method for a cylinder cover combustion chamber is characterized by comprising the following steps:

step S1: the cylinder cover is judged, and the cylinder cover is judged,

clamping the cylinder cover on a clamp of a machine tool through a cylinder cover fire surface, so that the cylinder cover fire surface is used as a reference when a machining program in the machine tool compiles a coordinate system; the height of a combustion chamber boss in each combustion chamber and the height of a cylinder cover firepower surface in the vertical direction are detected by a probe driven by a measuring main shaft of a machine tool, and the average value of each height is calculated; then comparing the average value with the theoretical value of the height, if the average value is not in the set range of the theoretical value and shows that the difference between the height and the theoretical value is too large, judging that the height is unqualified and not processing; if the average value is within the set range of the theoretical value, carrying out next processing;

step S2: the top surface of the cylinder cover is processed,

calculating the difference between the average value and the theoretical value, determining the milling depth of the top surface of the cylinder cover under the condition of ensuring that the distance between the top surface of the cylinder cover and a boss of a combustion chamber in the vertical direction is a designed distance, and processing the top surface of the cylinder cover;

step S3: the fire surface of the cylinder cover is processed,

after the top surface of the cylinder cover is machined, clamping the cylinder cover on a clamp of a machine tool through the top surface of the cylinder cover, and enabling the top surface of the cylinder cover to be used as a reference when a machining program in the machine tool compiles a coordinate system; according to the theoretical distance between the top surface of the cylinder cover and the fire surface of the cylinder cover in the vertical direction, the depth of the fire surface of the cylinder cover to be milled is determined, and then the fire surface of the cylinder cover is milled.

2. The on-line compensation processing method of the cylinder cover combustion chamber as claimed in claim 1, wherein each combustion chamber boss is provided with two detection points for contacting with the probe, and the two detection points are symmetrically arranged on two sides of the middle position of the combustion chamber; the detection points on the bosses of the combustion chambers are positioned on the same straight line.

3. The on-line compensation processing method for the cylinder head combustion chamber as claimed in claim 1, wherein in step S3, when milling the cylinder head fire surface, the milling is performed by performing a half finish milling with a depth of h1 on the cylinder head fire surface, and then performing a milling with a depth of h3, and the distance between the milled surface and the top surface of the cylinder head in the vertical direction is the theoretical distance.

4. The on-line compensation machining method for the cylinder head combustion chamber as claimed in claim 3, wherein when the milling with the depth of h3 is performed, the primary milling with the depth of h4 is performed in a primary machining area of the semi-finish-milled surface, the vertical distance between the primarily milled surface and the semi-finish-milled surface is detected by a probe, the vertical distance between the primarily milled surface and the semi-finish-milled surface is subtracted by h3 to obtain the vertical upward movement distance of the machining spindle, and the machining spindle is milled until the machining is completed after moving to a certain position.

5. The on-line compensation machining method for the cylinder head combustion chamber as claimed in claim 4, wherein h4 is 0.3-0.5 times of h 3.

6. The on-line compensation machining method for the cylinder head combustion chamber as claimed in claim 5, wherein h4 is 0.4 times of h 3.

Technical Field

The invention belongs to the technical field of engines, and particularly relates to an online compensation processing method for a cylinder cover combustion chamber.

Background

The volume of the cylinder head combustion chamber has a significant impact on engine performance, emissions, and fuel economy. During production and processing, the volume of the combustion chamber needs to be ensured so as to improve the qualification rate of the engine. Therefore, how to perform online compensation processing on the cylinder head combustion chamber to realize the control of the volume of the combustion chamber becomes a technical problem which needs to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide an online compensation processing method for a cylinder cover combustion chamber, which aims to solve the technical problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

an online compensation processing method for a cylinder cover combustion chamber comprises the following steps:

step S1: the cylinder cover is judged, and the cylinder cover is judged,

clamping the cylinder cover on a clamp of a machine tool through a cylinder cover fire surface, so that the cylinder cover fire surface is used as a reference when a machining program in the machine tool compiles a coordinate system; the height of a combustion chamber boss in each combustion chamber and the height of a cylinder cover firepower surface in the vertical direction are detected by a probe driven by a measuring main shaft of a machine tool, and the average value of each height is calculated; then comparing the average value with the theoretical value of the height, if the average value is not in the set range of the theoretical value, indicating that the difference between the height and the theoretical value is too large, judging that the height is unqualified and not processing; if the average value is within the set range of the theoretical value, carrying out the next processing;

step S2: the top surface of the cylinder cover is processed,

calculating the difference between the average value and the theoretical value, determining the milling depth of the top surface of the cylinder cover under the condition of ensuring that the distance between the top surface of the cylinder cover and a boss of the combustion chamber in the vertical direction is a designed distance, and processing the top surface of the cylinder cover;

step S3: the fire surface of the cylinder cover is processed,

after the top surface of the cylinder cover is machined, clamping the cylinder cover on a clamp of a machine tool through the top surface of the cylinder cover, and enabling the top surface of the cylinder cover to be used as a reference when a machining program in the machine tool compiles a coordinate system; according to the theoretical distance between the top surface of the cylinder cover and the fire surface of the cylinder cover in the vertical direction, the depth of the fire surface of the cylinder cover to be milled is determined, and then the fire surface of the cylinder cover is milled.

Preferably, each combustion chamber boss is provided with two detection points for contacting with the probe, and the two combustion chamber bosses are symmetrically arranged on two sides of the middle position of the combustion chamber; the detection points on the bosses of the combustion chambers are positioned on the same straight line.

Preferably, in step S3, when milling the cylinder head fire surface, the cylinder head fire surface is milled by half finish milling with a depth of h1, and then milled by h3, and the distance between the milled surface and the cylinder head top surface in the vertical direction is the theoretical distance.

Preferably, when milling with the depth of h3 is performed, firstly, primary milling with the depth of h4 is performed in a primary machining area of the semi-finish-milled surface, the vertical distance between the primarily milled surface and the semi-finish-milled surface is detected by a probe, the vertical distance between the primarily milled surface and the semi-finish-milled surface is subtracted by h3, the distance that the machining spindle needs to move vertically upwards again is obtained, and after the machining spindle moves to a proper position, milling is performed until the machining is completed.

Preferably, h4 is 0.3 to 0.5 times h 3.

Preferably, h4 is 0.4 times h 3.

The invention has the beneficial effects that:

according to the online compensation processing method for the cylinder cover combustion chamber, whether the cylinder cover is qualified or not can be judged, and compensation processing can be performed according to the difference value between the average value and the theoretical value when the top surface of the cylinder cover is processed, so that the distance between the top surface of the cylinder cover and a boss of the combustion chamber in the vertical direction is stable and is not easy to fluctuate; meanwhile, when the cylinder cover fire surface is processed, the processed cylinder cover top surface is used as a reference, the cylinder cover is positioned accurately, the processing precision of the cylinder cover fire surface is improved, the distance between the cylinder cover top surface and the cylinder cover fire surface in the vertical direction is stable, the distance between the combustion chamber boss and the cylinder cover fire surface is stable, and the control of the volume of the combustion chamber is well realized.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and the embodiments of the present invention will be further described in detail with reference to the drawings, wherein

FIG. 1 is a flow chart of an online compensation processing method for a cylinder head combustion chamber according to an embodiment of the invention;

FIG. 2 is a schematic view of a cylinder head fire surface clamped on a clamp according to an embodiment of the present invention;

FIG. 3 is a schematic view of a top surface of a cylinder head clamped on a clamp according to an embodiment of the present invention;

FIG. 4 is a schematic view of a detection point on a boss of a combustion chamber according to an embodiment of the present invention;

FIG. 5 is a schematic view of a cylinder head provided by an embodiment of the present invention;

fig. 6 is an enlarged view at the lower right corner in fig. 5.

In the drawings, the reference numbers:

11. clamp 12, measuring spindle 13, probe 21, cylinder cover 22 and cylinder cover top surface

23. Cylinder head fire surface 24, combustion chamber boss 25 and primary processing area

P1 to P8, detection points

h. Height of combustion chamber boss and cylinder cover fire surface in vertical direction

H1, distance between the top surface of the cylinder cover and the boss of the combustion chamber in the vertical direction

h2, depth of top surface of cylinder cover needing milling

H. Thickness of cylinder cover

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description will be provided with reference to specific embodiments.

As shown in fig. 1 to 6, an embodiment of the present invention provides an online compensation processing method for a cylinder head combustion chamber, which includes the following steps:

step S1: the cylinder cover is judged, and the cylinder cover is judged,

clamping the cylinder cover 21 on a clamp 11 of a machine tool through a cylinder cover fire surface 23, and enabling the cylinder cover fire surface to be used as a reference when a machining program in the machine tool compiles a coordinate system; the height h of a combustion chamber boss 24 in each combustion chamber and the height h of a cylinder cover fire surface in the vertical direction are detected by driving a probe 13 through a measuring main shaft 12 of a machine tool, and the average value of each height is calculated; then comparing the average value with the theoretical value of the height, if the average value is not in the set range of the theoretical value, indicating that the difference between the height and the theoretical value is too large, judging that the height is unqualified and not processing; if the average value is within the set range of the theoretical value, carrying out the next processing;

step S2: the head top surface 22 is machined and,

calculating the difference between the average value and the theoretical value, determining the depth H2 of the top surface of the cylinder cover needing to be milled under the condition of ensuring that the distance H1 between the top surface of the cylinder cover and the boss of the combustion chamber in the vertical direction is a designed distance, and processing the top surface of the cylinder cover;

step S3: the cylinder head fire surface 23 is processed,

after the top surface 22 of the cylinder cover is machined, clamping the cylinder cover on a clamp of a machine tool through the top surface of the cylinder cover, and enabling the top surface 22 of the cylinder cover to be used as a reference when a coordinate system is compiled in a machining process; according to the theoretical distance between the top surface of the cylinder cover and the fire surface of the cylinder cover in the vertical direction, namely the thickness H of the cylinder cover in the vertical direction, the depth of the fire surface 23 of the cylinder cover needing to be milled is determined, and then the fire surface 23 of the cylinder cover is milled.

The online compensation processing method for the cylinder cover combustion chamber provided by the embodiment of the invention not only can judge whether the cylinder cover is qualified, but also can perform compensation processing according to the difference value between the average value and the theoretical value when the top surface of the cylinder cover is processed, so that the distance between the top surface of the cylinder cover and a boss of the combustion chamber in the vertical direction is relatively stable and is not easy to fluctuate; meanwhile, when the cylinder cover fire surface is processed, the processed cylinder cover top surface is used as a reference, the cylinder cover is positioned accurately, the processing precision of the cylinder cover fire surface is improved, the distance between the cylinder cover top surface and the cylinder cover fire surface in the vertical direction is stable, the distance between the combustion chamber boss and the cylinder cover fire surface is stable, and the control of the volume of the combustion chamber is well realized.

Furthermore, each combustion chamber boss 24 is provided with two detection points for contacting with the probe, and the two detection points are symmetrically arranged on two sides of the middle position of the combustion chamber; the detection points on the bosses of the combustion chambers are positioned on the same straight line, so that the numerical value of the average value is more accurate, and the distance between the boss of the combustion chamber and the fire surface of the cylinder cover can be better reflected. It will be appreciated that in a four cylinder engine the number of sensing points is eight, i.e. P1 to P8, as shown in figures 4 and 5.

Specifically, in step S3, when milling the cylinder head power surface, the cylinder head power surface is milled by first performing semi-finish milling with a depth of h1 and then milling with a depth of h3, and the distance between the milled surface and the cylinder head top surface in the vertical direction is the theoretical distance, so that the semi-finish milling with a depth of h1 is performed before the milling with the depth of h3, and the finished cylinder head power surface can be well prevented from being scratched in subsequent positioning and transportation. It is understood that the value of h1 can be set in the machine tool according to the theoretical distance, and h3 is the semi-finish milling allowance; the sum of h1 and h3 is equal to the theoretical distance described above.

Further, when milling with the depth of h3 is performed, firstly, primary milling with the depth of h4 is performed in a primary machining area of the semi-finish-milled surface, the vertical distance between the primarily milled surface and the semi-finish-milled surface is detected by a probe, the vertical distance between the primarily milled surface and the semi-finish-milled surface is subtracted by h2, the distance that the machining spindle needs to move vertically upwards again is obtained, and after the machining spindle moves to a position, milling is performed until the machining is completed. By adopting the scheme, the initial milling is carried out according to a certain amount such as h4, then the distance between the initially milled surface and the semi-finish milled surface in the vertical direction is detected, the distance between the initially milled surface and the semi-finish milled surface in the vertical direction is subtracted by calculating h3 to obtain the amount which is not milled, then the machining spindle is adjusted according to the amount which is not milled for machining, compared with the direct milling with the depth of h3, the machining error can be better avoided from being too large, and the machining precision can be better ensured.

Specifically, h4 is 0.3 to 0.5 times h 3.

It may be preferred that h4 be 0.4 times h 3.

The invention can ensure the stability of each size of the cylinder cover, has simple calculation and is easy to control the volume of the combustion chamber.

The above are only preferred embodiments of the present invention, it should be noted that these examples are only for illustrating the present invention and not for limiting the scope of the present invention, and after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalents also fall within the scope of the claims appended to the present application.