A processing technology for diamond-like carbon film on the side of a piston ring and its tooling components

Abstract

The present invention discloses a processing technology and a tooling component for a diamond-like carbon film on the side surface of a piston ring. The coating processing technology specifically includes the following steps: Step 1, polishing or sandblasting the surface of the piston ring; Step 2, performing hydrocarbon cleaning on the piston ring to wash away the oil stains on the surface of the piston ring; Step 3, clamping the washed piston ring onto a specific tooling component; Step 4, applying a primer layer to the outer circle and the side surface of the piston ring after installation; Step 5, depositing a carbon layer on the surface of the piston ring with the primer layer; Step 6, grinding and polishing the surface of the piston ring after coating to complete the coating processing of the piston ring. By plating a diamond-like carbon coating on the side surface of the piston ring, the present invention improves the wear resistance of the side surface of the piston ring, reduces the attack of the side surface of the piston ring on the ring groove, is beneficial to reducing the oil consumption and air leakage of the engine, and has a more obvious effect on engines with high explosion pressure and high heat load.

Description

Technical Field

[0001] The present invention relates to the technical field of piston ring production and processing, and particularly relates to a diamond-like carbon film processing technology and tooling components for the side surface of a piston ring. Background Art

[0002] A piston ring is a metal elastic ring with a large outward expansion deformation, which is assembled into a corresponding annular groove with the same cross-section. The reciprocating and rotating piston ring forms a seal between the outer circumferential surface of the ring and the cylinder, as well as between one side of the ring and the ring groove, relying on the pressure difference of gas or liquid.

[0003] The existing piston rings have the following disadvantages:

[0004] 1. There is no coating or the coating has low anti-wear ability on the side surface of the piston ring, and the attack degree of the side surface of the piston ring on the ring groove is relatively large.

[0005] 2. The increase in wear degree leads to an increase in the leakage channel, an increase in the air leakage of the engine, an increase in the oil consumption of the engine, and a decrease in the power of the engine. Summary of the Invention

[0006] The purpose of the present invention is to provide a diamond-like carbon film processing technology and tooling components for the side surface of a piston ring. By plating a layer of diamond-like carbon coating on the side surface of the piston ring, the wear resistance of the side surface of the piston ring is improved, the attack of the side surface of the piston ring on the ring groove is reduced, and the problem of aluminum adhesion between the side surface of the piston ring and the piston is also solved.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A diamond-like carbon film processing technology for the side surface of a piston ring, the coating processing technology specifically includes the following steps:

[0009] Step 1: Polish or sandblast the surface of the piston ring;

[0010] Step 2: Clean the piston ring with hydrocarbon to wash off the oil stain on the surface of the piston ring;

[0011] Step 3: Clamp the washed piston ring onto a specific tooling component;

[0012] Step 4: Apply a primer layer to the outer circle and side surface of the installed piston ring;

[0013] Step 5: Deposit a carbon layer on the surface of the piston ring with the primer layer;

[0014] Step 6: Grind and polish the surface of the coated piston ring to complete the coating processing of the piston ring.

[0015] As a further solution of the present invention: when the transition layer is made of a single material of Ti, Cr, Ni or W, the thickness of the transition layer is 0.1 - 0.5 μm.

[0016] As a further solution of the present invention: when the transition layer is made of any two combined materials of Ti, Cr, Ni or W, the thickness of the transition layer is 0.2 - 0.7 μm.

[0017] As a further solution of the present invention: the carbon layer coating is carried out by physical vapor deposition or chemical vapor deposition.

[0018] As a further solution of the present invention: the thickness of the carbon layer coating is 1 - 10 μm.

[0019] As a further solution of the present invention: the surface roughness of the piston ring after grinding and polishing is Ra0.05 - 0.5 and Rz0.2 - 3.0.

[0020] As a further solution of the present invention: a diamond - like carbon film processing tooling assembly for the side of a piston ring, including a shaft rod. Both ends of the shaft rod are fixedly connected with connecting seats. A number of groups of kits are evenly and fixedly arranged on the shaft rod. A plurality of ring support members are annularly arrayed on the outer periphery of the kits. The ring support members are used to position and support the piston ring for side coating processing.

[0021] As a further solution of the present invention: the distance between adjacent kits is 5 - 100 mm.

[0022] As a further solution of the present invention: the ring support member includes a support kit and a support connecting rod. An installation hole is provided on the support kit. The support connecting rod is slidably arranged at the installation hole. A spring is arranged in the installation hole. Two ends of the spring are respectively connected to the support kit and the support connecting rod.

[0023] As a further solution of the present invention: one end of the support connecting rod away from the support kit is provided with an arc - shaped support rod, and a limiting wheel is arranged on the arc - shaped support rod.

[0024] The beneficial effects of the present invention:

[0025] (1) By plating a layer of diamond - like carbon coating on the side of the piston ring, the side wear resistance of the piston ring is improved, the attack of the piston ring side on the ring groove is reduced, and the problem of aluminum adhesion between the piston ring side and the piston is also solved. It is beneficial to reduce the oil consumption and air leakage of the engine, and has a more obvious effect on engines with high explosion pressure and high heat load.

[0026] (2) The specific tooling assembly can stably install the piston ring, ensure the stability of the piston ring during the subsequent coating treatment, and at the same time, the specific tooling assembly can process multiple piston rings of different specifications simultaneously, effectively improving the processing efficiency.

[0027] (3) The carbon layer coating is deposited by physical vapor deposition, chemical vapor deposition or spraying. There are many components in the coating layer, such as MoS2, CrN, etc. The hardness range of the piston ring coating after coating is 1800 - 3000 Hv, which makes the side of the piston ring more wear-resistant, the surface roughness smaller, the attack on the ring groove smaller, and the air leakage and oil consumption can be reduced.

[0028] (4) Utilize the elastic action of the spring to ensure the stable support of the supporting connecting rod for the piston ring. At the same time, an arc-shaped support rod is arranged at the end of the supporting connecting rod. A concave arc structure is arranged on the arc-shaped support rod for the positioning of the piston ring, and a limiting wheel is arranged at the end of the arc-shaped support rod to clamp and limit the piston ring, realizing the positioning support for piston rings of different specifications. Description of the Drawings

[0029] The present invention will be further described below with reference to the drawings.

[0030] Figure 1 It is a schematic diagram of a form of the surface coating of the piston ring of the present invention;

[0031] Figure 2 It is another schematic diagram of the form of the surface coating of the piston ring of the present invention;

[0032] Figure 3 It is a three-dimensional structure schematic diagram of the working component of the present invention in the use state;

[0033] Figure 4 It is a sectional structure schematic diagram of the working component of the present invention in the use state;

[0034] Figure 5 It is a three-dimensional structure schematic diagram of the working component of the present invention;

[0035] Figure 6 It is a front view structure schematic diagram of the working component of the present invention;

[0036] Figure 7 It is a top view structure schematic diagram of the working component of the present invention;

[0037] Figure 8 It is a structure schematic diagram of the ring support member of the present invention.

[0038] In the figure: 1, connecting seat; 2, shaft rod; 3, kit; 4, ring support member; 41, support kit; 42, mounting hole; 43, support connecting rod; 44, spring; 45, arc-shaped support rod; 46, limiting wheel; 5, piston ring. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0040] The present invention relates to a process for processing diamond-like carbon film on the side surface of a piston ring. The coating process specifically includes the following steps:

[0041] Step 1: Polish or sandblast the surface of the piston ring 5.

[0042] Step 2: Clean the piston ring 5 with hydrocarbon to wash away the oil stains on the surface of the piston ring 5, ensuring the cleanliness of the surface before coating, and preventing the influence of oil stains or impurities on the surface of the piston ring 5 on the spraying quality, thereby affecting the overall finished quality of the piston ring 5.

[0043] Step 3: Clamp the cleaned piston ring 5 onto a specific tooling component. The specific tooling component can stably install the piston ring 5, ensuring the stability of the piston ring 5 during subsequent coating treatment. At the same time, the specific tooling component can process multiple piston rings 5 of different specifications simultaneously, effectively improving the processing efficiency.

[0044] Step 4: Apply a bottom layer to the outer circle and side surface of the installed piston ring 5. When the bottom layer is a single material of Ti, Cr, Ni, or W, the thickness of the bottom layer is 0.1 - 0.5 μm; when the bottom layer is any two combined materials of Ti, Cr, Ni, or W, the thickness of the bottom layer is 0.2 - 0.7 μm.

[0045] Step 5: Coat the surface of the piston ring 5 with a carbon layer after applying the bottom layer. The carbon layer coating can be carried out by multi-arc or magnetron filtered vacuum cathodic arc.

[0046] Step 6: Grind and polish the surface of the coated piston ring 5 to complete the coating process of the piston ring 5. After grinding and polishing, the surface roughness of the piston ring 5 is Ra 0.05 - 0.5 and Rz 0.2 - 3.0.

[0047] When processing the carbon layer coating of the piston ring 5, it can be selected to coat the outer circle surface and the upper and lower side surfaces of the piston ring 5 simultaneously according to actual needs. As Figure 1 shown, this coating process can comprehensively process the outer side surface of the piston ring 5, effectively improving the overall quality of the piston ring 5.

[0048] However, in some cases, it is not necessary to comprehensively process the outer side surface of the piston ring 5. Therefore, it is only necessary to coat the outer circle surface and the lower side surface of the piston ring 5, as Figure 2As shown, this coating process performs local coating treatment on the piston ring 5 to adapt to specific working environments.

[0049] The carbon layer coating is carried out by physical vapor deposition or chemical vapor deposition. There are many components in the coating layer, such as MoS2, CrN, etc. The hardness range of the coating on the piston ring 5 after coating is 1800 - 3000 Hv, which makes the side of the piston ring 5 more wear-resistant, the surface roughness smaller, the attack on the ring groove smaller, and can reduce the air leakage and oil consumption.

[0050] This embodiment also discloses a diamond-like carbon film processing tooling assembly for the side of the piston ring, as Figures 3 - 8 shown. The tooling assembly mainly consists of a shaft rod 2 and several sets 3. Connecting seats 1 are fixedly connected to both ends of the shaft rod 2. The connecting seats 1 are used to connect with an external driving mechanism. By driving the connecting seats 1 and the shaft rod 2 to rotate, it is convenient to perform coating processing on the piston ring 5 installed on the tooling assembly. By using the rotation method, the outer peripheral side of the piston ring 5 can be coated, and uniform and rapid coating of the outer peripheral side of the piston ring 5 can be achieved.

[0051] Several sets 3 are all installed on the shaft rod 2. Multiple groups of ring support members 4 are arranged in a circular array on the several sets 3. The ring support members 4 are used to support the inner peripheral side wall of the piston ring 5 to ensure the stability of the piston ring 5 during coating processing. At the same time, the distance between the sets 3 is 5 - 100 mm, and the distance between the sets 3 can be adjusted according to different piston rings 5 to be processed. At the same time, each set 3 is an independent structure, and piston rings 5 of different specifications can be installed on different sets 3 of the same shaft rod 2, so that a tooling assembly can process piston rings 5 of different specifications at the same time.

[0052] The ring support member 4 includes a support set 41 and a support link 43. An installation hole 42 is provided on the support set 41. The support link 43 is slidably arranged at the installation hole 42. A spring 44 is arranged in the installation hole 42, and both ends of the spring 44 are respectively connected to the support set 41 and the support link 43. One end of the support link 43 away from the support set 41 is provided with an arc-shaped support rod 45, and a limiting wheel 46 is arranged on the arc-shaped support rod 45. According to the different structural specifications of the piston ring 5, the elastic action of the spring 44 is used to ensure the stable support of the support link 43 for the piston ring 5. At the same time, an arc-shaped support rod 45 is arranged at the end of the support link 43, and a concave arc structure is arranged on the arc-shaped support rod 45 for the positioning of the piston ring 5. And a limiting wheel 46 is arranged at the end of the arc-shaped support rod 45 to clamp and limit the piston ring 5. The ring diameter of the piston ring 5 that the tooling assembly can load is 50 - 300 mm.

[0053] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A processing technology for diamond-like carbon film on the side surface of a piston ring, characterized in that, The film processing technology specifically includes the following steps: Step 1: Polish or sandblast the surface of the piston ring (5); Step 2: Conduct hydrocarbon cleaning on the piston ring (5) to wash off the oil stains on the surface of the piston ring (5); Step 3: Clamp the washed piston ring (5) onto a specific tooling component; Step 4: Apply a primer layer to the outer circle and side surface of the installed piston ring (5) for the transition layer; Step 5: Deposit a carbon layer on the surface of the piston ring (5) after applying the primer transition layer; Step 6: Grind and polish the surface of the piston ring (5) after coating to complete the coating processing of the piston ring (5); The tooling component for processing the diamond-like carbon film on the side surface of the piston ring includes a shaft rod (2). Both ends of the shaft rod (2) are fixedly connected with connecting seats (1). A number of groups of kits (3) are evenly and fixedly arranged on the shaft rod (2). A plurality of ring support members (4) are annularly arrayed on the outer periphery of the kit (3). The ring support member (4) is used to position and support the piston ring (5) for side surface coating processing; The distance between adjacent kits (3) is 5 - 100 mm; The ring support member (4) includes a support kit (41) and a support connecting rod (43). An installation hole (42) is provided on the support kit (41). The support connecting rod (43) is slidably arranged at the installation hole (42). A spring (44) is arranged in the installation hole (42). Both ends of the spring (44) are respectively connected to the support kit (41) and the support connecting rod (43); One end of the support connecting rod (43) far from the support kit (41) is provided with an arc-shaped support rod (45), and a limit wheel (46) is arranged on the arc-shaped support rod (45); The arc-shaped support rod (45) is provided with a concave arc structure for positioning the piston ring (5), and a limit wheel (46) is arranged at the end of the arc-shaped support rod (45) to clamp and limit the piston ring (5); After the piston ring (5) is ground and polished, the surface roughness is Ra 0.05 - 0.5, Rz 0.2 - 3.

0.

2. The processing technology of the diamond-like carbon film on the side of a piston ring according to claim 1, wherein When the transition layer is made of a single material of Ti, Cr, Ni, or W, the thickness of the transition layer is 0.1 - 0.5 μm.

3. A processing technology for diamond-like carbon film on the side surface of a piston ring according to claim 1, characterized in that, When the transition layer is made of any two combined materials of Ti, Cr, Ni, or W, the thickness of the transition layer is 0.2 - 0.7 μm.

4. A processing technology for diamond-like carbon film on the side surface of a piston ring according to claim 1, characterized in that, The carbon layer coating is carried out by physical vapor deposition or chemical vapor deposition.

5. A processing technology for diamond-like carbon film on the side of a piston ring according to claim 1, characterized in that, The thickness of the carbon layer coating is 1 - 10 μm.

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