A method for processing a piston ring edge fillet

Abstract

This invention relates to the field of piston ring processing technology, specifically a method for processing the rounded corners of piston ring edges. The processing method includes the following steps: S1: Overall phosphating treatment of the piston ring; S2: Removing the chamfer on the outer edge of the piston ring: First, add brown corundum triangular grinding stones and brown corundum circular grinding stones in a certain proportion into a vortex grinding machine, and add an appropriate amount of grinding fluid. Then, place the first piston ring into the vortex grinding machine and inject water until the grinding stones are completely submerged. Then, start the vortex grinding machine to grind the chamfer on the outer edge of the piston ring, and obtain the second piston ring after grinding; S3: Removing the chamfer on the inner edge of the piston ring. In this invention, the vortex grinding processing method is used to grind the inner and outer edge rounded corners of the piston ring respectively, which can achieve the tangency between the edge arc and the edge, and achieve no intersection point and absolutely smooth transition, thereby improving the processing accuracy of the inner and outer edge rounded corners of the piston ring.

Description

Technical Field

[0001] This invention relates to the field of piston ring processing technology, specifically a method for processing the rounded corners of piston ring edges. Background Technology

[0002] Currently, the inner and outer edges of piston rings are generally machined by turning or grinding. However, these two methods have the following disadvantages:

[0003] 1. Turning is only suitable for machining with low precision requirements and inner and outer corner radii of at least 1mm due to the influence of tool marks on measurement accuracy. It is not suitable for machining with high precision requirements and corner radii of less than 1mm. In addition, due to the influence of positioning accuracy, it is difficult to achieve tangency between the machined arc and the edge, so there is an intersection at the edge, and it is impossible to achieve a completely smooth transition.

[0004] 2. Although grinding improves precision by one level compared to turning, it is only suitable for piston rings with a cylinder diameter of Φ50 or greater and inner and outer corner radii of at least 1mm. It is not suitable for piston rings with a cylinder diameter less than Φ50 and a corner radius of less than 1mm.

[0005] 3. The CNC lathe rounded corner programming machining method needs to consider the tool tip compensation problem. The forming tool used in the CNC lathe rounded corner forming tool machining method and the forming template used in the grinding process both require high-precision optical curve grinding machine or slow wire EDM machine. The equipment is expensive, the process is complex, and the cost is high.

[0006] Therefore, there is an urgent need to adopt a new processing method to process the rounded corners of piston ring edges. Summary of the Invention

[0007] The purpose of this invention is to provide a method for machining the rounded corners of piston ring edges to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for machining the rounded corners of a piston ring edge, the machining method comprising the following steps:

[0009] S1: Overall phosphating treatment of piston rings: The piston rings are sequentially subjected to pickling, two water washing, surface conditioning, manganese phosphating, two water washing, sealing and drying to obtain the first piston ring;

[0010] S2: Remove the chamfer on the outer edge of the piston ring: First, add the brown fused alumina triangular grinding stone and the brown fused alumina circular grinding stone to the vortex grinder in a certain proportion, and add an appropriate amount of grinding liquid. Then, put the first piston ring into the vortex grinder and inject water until the grinding stone is completely submerged in water. Then, start the vortex grinder to grind the chamfer on the outer edge of the piston ring. After grinding, the second piston ring is obtained.

[0011] S3: Remove the chamfer on the inner round edge of the piston ring: After taking out the second piston ring, install it into the ring, and then put the ring with the second piston ring into the vortex grinding machine to grind the chamfer on the inner round edge of the piston ring.

[0012] Preferably, the conditions for manganese phosphating in the overall phosphating treatment of the piston ring in step S1 are: total acidity: 40-60 Pt, free acidity: 6-16 Pt, temperature: 90-105℃, and manganese phosphating time: 60s with an extension of 60s.

[0013] Preferably, the optimal ratio of the brown fused alumina oblique triangular abrasive stone to the brown fused alumina circular abrasive stone is 5:4.

[0014] Preferably, the eddy current grinding machine has a frequency conversion speed regulation of 24-28Hz for both outer and inner cylindrical grinding.

[0015] Preferably, the grinding time of the eddy current grinding machine is 25 min to 30 min for both outer and inner circle grinding.

[0016] Preferably, the amount of the grinding fluid added is 50ml to 100ml.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] In this invention, eddy current grinding is used to grind the inner and outer edges of the piston rings, which can achieve tangency between the edge arcs and the edges, and realize a seamless transition without any intersection points, thereby improving the machining accuracy of the inner and outer edges of the piston rings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the preparation method of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 The present invention provides a technical solution:

[0023] A method for machining the rounded corners of a piston ring edge, the method comprising the following steps:

[0024] S1: Overall phosphating treatment of piston rings: The piston rings are sequentially subjected to pickling, two water washing, surface conditioning, manganese phosphating, two water washing, sealing and drying to obtain the first piston ring;

[0025] S2: Remove the chamfer on the outer edge of the piston ring: First, add the brown fused alumina triangular grinding stone and the brown fused alumina circular grinding stone to the vortex grinder in a certain proportion, and add an appropriate amount of grinding liquid. Then, put the first piston ring into the vortex grinder and inject water until the grinding stone is completely submerged in water. Then, start the vortex grinder to grind the chamfer on the outer edge of the piston ring. After grinding, the second piston ring is obtained.

[0026] S3: Remove the chamfer on the inner round edge of the piston ring: After taking out the second piston ring, install it into the ring, and then put the ring with the second piston ring into the vortex grinding machine to grind the chamfer on the inner round edge of the piston ring.

[0027] Specifically, the conditions for manganese phosphating in the overall phosphating treatment of the piston ring in step S1 are: total acidity: 40-60 Pt, free acidity: 6-16 Pt, temperature: 90-105℃, and manganese phosphating time: 60s with an extension of 60s.

[0028] Specifically, the optimal ratio of the brown fused alumina oblique triangular grinding stone to the brown fused alumina circular grinding stone is 5:4.

[0029] Specifically, the eddy current grinding machine uses a frequency conversion speed regulation of 24-28Hz for both outer and inner cylindrical grinding.

[0030] Specifically, the grinding time of the eddy current grinding machine is 25 min to 30 min for both outer and inner circle grinding.

[0031] Specifically, the amount of the grinding fluid added is 50ml to 100ml.

[0032] Please refer to Figure 1 Embodiment 1 of the present invention is as follows:

[0033] A method for machining the rounded corners of a piston ring edge, the method comprising the following steps:

[0034] S1: Overall phosphating treatment of piston rings: The piston rings are sequentially subjected to pickling, two-stage water washing, surface conditioning, manganese phosphating, two-stage water washing, sealing and drying to obtain the first piston ring. The conditions for manganese phosphating are: total acidity: 50Pt, free acidity: 10Pt, temperature: 95℃, and manganese phosphating time: 60s with an extension of 60s.

[0035] S2: Remove the chamfer on the outer edge of the piston ring: First, add brown fused alumina triangular grinding stone and brown fused alumina round grinding stone in a 5:4 ratio into the vortex grinder, and add 80ml of grinding liquid. Then, put the first piston ring into the vortex grinder and add water until the grinding stone is completely submerged. Then, start the vortex grinder to grind the chamfer on the outer edge of the piston ring for 25min-30min. After grinding, the second piston ring is obtained.

[0036] S3: Remove the chamfer on the inner round edge of the piston ring: After cleaning the second piston ring, install it into the ring. Then, put the ring with the second piston ring into the vortex grinding machine to grind the chamfer on the inner round edge of the piston ring.

[0037] After the inner round edges of the piston rings are chamfered and ground, the piston rings are removed, cleaned, and the edges of the piston ring openings are chamfered to complete the piston ring processing.

[0038] In this embodiment, the grinding time and grinding speed of the turbo mill are set according to the different hardness of the piston ring material and the different sizes of the edge radius.

[0039] This invention provides a method for machining the rounded corners of piston ring edges. The method uses eddy current grinding to grind the rounded corners of the inner and outer edges of the piston ring, which can achieve tangency between the rounded corners and the edges, and achieve a seamless transition without any intersection points, thereby improving the machining accuracy of the rounded corners of the inner and outer edges of the piston ring.

[0040] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method of machining a fillet on a piston ring land, the method comprising: The processing method includes the following steps: ​ S1: Overall phosphating treatment of piston rings: After the piston rings are sequentially subjected to pickling, two-stage water washing, surface conditioning, manganese phosphating, two-stage water washing, sealing and drying, the first piston ring is obtained. The conditions for manganese phosphating in the overall phosphating treatment of piston rings in step S1 are: total acidity: 40-60 Pt, free acidity: 6-16 Pt, temperature: 90-105℃, and manganese phosphating time: 60s with an extension of 60s. S2: Remove the chamfer on the outer edge of the piston ring: First, add brown fused alumina triangular grinding stone and brown fused alumina round grinding stone in a certain ratio into the vortex grinder, and add an appropriate amount of grinding fluid. Then, put the first piston ring into the vortex grinder and inject clean water until the grinding stone is completely submerged in water. Then, start the vortex grinder to grind the chamfer on the outer edge of the piston ring. After grinding, the second piston ring is obtained. The optimal ratio of the brown fused alumina triangular grinding stone to the brown fused alumina round grinding stone is 5:

4. S3: Remove the chamfer on the inner round edge of the piston ring: After removing the second piston ring, install it into the ring, and then put the ring with the second piston ring into the vortex grinding machine to grind the chamfer on the inner round edge of the piston ring.

2. A method of processing a fillet of a piston ring edge according to claim 1, characterized in that: The eddy current grinding machine has a variable frequency speed regulation of 24-28Hz for both outer and inner cylindrical grinding.

3. The method of claim 1, wherein: The grinding time for both the outer and inner circles of the eddy current grinding machine is 25 to 30 minutes.

4. The method of claim 1 wherein: The amount of the grinding fluid added is 50ml to 100ml.

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