Piston ring circumference surface polishing apparatus

Abstract

The application provides a piston ring circumferential surface polishing device for polishing the circumferential surface of a piston ring blank, comprising a first support and a second support; during polishing, the first support is placed on the inner side of the piston ring blank to contact the inner circumferential surface of the piston ring blank, and the outer circumferential surface is placed on the outer side of the piston ring blank to contact the outer circumferential surface of the piston ring blank; one is a driving member, and the other is a driving member; there is a speed difference between the linear speed of the driving member at the contact position with the piston ring blank and the linear speed of the polishing head at the contact position with the piston ring blank. The piston ring circumferential surface polishing device realizes the circumferential surface polishing and deburring operation of the piston ring blank with a non-circular cross section through the driving member and the polishing head arranged in sequence on the inner and outer circumferential surfaces of the piston ring blank.

Description

Technical Field

[0001] This invention relates to the technical field of piston ring grinding equipment, and specifically to a piston ring circumferential surface grinding equipment. Background Technology

[0002] Piston rings are a key component of internal combustion engines, serving functions such as sealing, oil control, heat transfer, and support. Due to the presence of openings, piston rings experience inconsistent contact pressure distribution circumferentially during assembly. To improve piston ring performance and achieve a contact pressure distribution more suited to engine performance requirements after installation, the shape of the piston ring in its free state can be fine-tuned. This means that the free state shape of the piston ring is not a traditional perfect circle. The utility model patent application CN205464202U, entitled "A Cylindrical Piston Ring Blank," discloses the aforementioned non-circular piston ring.

[0003] Non-circular piston rings can be produced as blanks through casting processes. Materials used in casting include ductile iron and alloy cast iron. The inner and outer circles of the cast piston ring blank are non-circular. Due to the required draft angle, the cross-sectional shape of the elliptical piston ring blank is trapezoidal. The piston ring blank casting process includes sand casting with one mold for four, six, eight, or ten rings. After sand removal and ring casting, the outer surface of a single elliptical piston ring blank has casting residues such as sprue remnants, casting flash, and casting burrs. These residues are hard; if not removed or not removed completely, subsequent machining processes become significantly more difficult, and tool life is drastically reduced.

[0004] General-purpose internal and external cylindrical grinding machines cannot adapt to the surface shape of non-circular piston rings to complete the grinding of surface burrs and other defects. Some piston ring manufacturers use simple mechanical devices for manual grinding of residual sprues, flash, and burrs on the inner and outer surfaces of elliptical piston ring blanks. However, this method is inefficient, provides harsh working conditions for operators, and is unsuitable for large-scale industrial production. A similar grinding fixture has been developed in publication CN115488727B entitled "A Grinding Fixture for PTFE Piston Rings".

[0005] The invention patent for "Grinding Device" discloses a technical solution that does not actually provide information regarding non-circular piston rings.

[0006] Effective technical solutions for polishing. Summary of the Invention

[0007] To address the problem that existing grinding equipment cannot meet the needs of grinding and deburring the circumferential surface of non-circular piston rings, this invention provides a piston ring circumferential surface grinding device.

[0008] The technical solution of the present invention provides a piston ring circumferential surface grinding device, preferably comprising a first support member and a second support member;

[0009] During the grinding operation, the first support is placed inside the piston ring blank and contacts the inner circular surface of the piston ring blank, while the second support is placed outside the piston ring blank and contacts the outer circular surface of the piston ring blank.

[0010] One of the first support member and the second support member is a drive member for driving the piston ring blank to rotate, and the other is a drive member for grinding the circumferential surface of the piston ring blank; there is a speed difference between the linear velocity at the contact point between the drive member and the piston ring blank and the linear velocity at the contact point between the grinding head and the piston ring blank.

[0011] Preferably, at least one of the drive member and the grinding head elastically presses against the circumferential surface of the piston ring blank.

[0012] Preferably, the shaft of at least one of the drive member and the grinding head is elastically floating to ensure stable clamping of any piston ring blank at any position in the axial direction of the drive member during the grinding operation.

[0013] Preferably, the distance between the driving member and the grinding head is adjustable; in the open state, the distance is widened to complete the loading and unloading of the piston ring blank; in the grinding state, the distance is narrowed so that the driving member and the grinding head clamp the piston ring blank.

[0014] Preferably, the drive component is placed on a floating frame, which is rotatably mounted around a shaft parallel to the axis of the grinding head. The distance between the grinding head and the drive component is adjusted by rotating the floating frame.

[0015] Preferably, a telescopic component is rotatably connected or hinged to the floating frame, and the other end of the telescopic component is rotatably fixed or hinged fixed; the telescopic component is controlled to extend and retract to control the rotation of the floating frame around the axis; in the grinding state, the telescopic component provides the driving component with an elastic clamping force to press the piston ring blank.

[0016] Preferably, the two ends of the drive shaft are elastically floating relative to the rotation center line of the grinding head; the position of the drive shaft is elastically finely adjusted to accommodate the differences in piston ring blanks grouped on the grinding head.

[0017] Preferably, one end of the grinding head is connected to the frame, and the other end forms a free end that extends freely; the grinding head is cantilevered.

[0018] Preferably, it also includes a movable baffle, which is disposed on one side of the free end of the grinding head; during loading and unloading operations, the movable baffle moves away from the front of the free end of the grinding head; during grinding operations, the movable baffle returns to a position close to the free end of the grinding head, and the gap between the movable baffle and the free end of the grinding head does not exceed the wall thickness of a single piston ring blank.

[0019] Preferably, the first support member is a grinding head used for grinding the inner surface of the piston ring blank; or,

[0020] The second support member is a grinding head, used for grinding the outer circumferential surface of the piston ring blank. The piston ring circumferential surface grinding equipment of the present invention comprises a driving member and a grinding head arranged sequentially on the inner and outer circumferences of the piston ring blank.

[0021] This invention enables the grinding and deburring of the circumferential surface of piston ring blanks with non-circular cross-sections. Because it achieves grinding of the entire circumference of the piston ring blank without relying on rotation around its axis, but instead uses a localized relative clamping method to achieve dynamic rotational grinding, it can adapt to changes in the circumferential curvature of the piston ring blank, enabling uniform grinding of the circumferential surface and batch grinding of piston ring blanks. It should be noted that this piston ring circumferential surface grinding equipment is also compatible with grinding piston ring blanks with circular cross-sections. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the piston ring circumferential surface grinding equipment of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating a further improvement to the piston ring circumferential surface grinding equipment of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the principle of a specific embodiment of the piston ring circumferential surface grinding equipment of the present invention;

[0025] Figure 4 This is a schematic diagram of a specific embodiment of the piston ring circumferential surface grinding equipment of the present invention;

[0026] Figure 5 This is a simplified structural diagram of a further improvement to the piston ring circumferential surface grinding equipment of the present invention. In the diagram,

[0027] W: Piston ring blank A1: First support component A2: Second support component 11: Drive component 12: Grinding head 13: Elastic component 14: Floating frame 15: Telescopic component 16: Duckbill lever 17: Movable baffle 111: Elastic connector O: Rotary shaft S1: Inner circular surface S2: Outer circular surface Detailed Implementation

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In this specification, the dimensions of the drawings do not represent the actual dimensions. They are only used to illustrate the relative positional and connection relationships between the components. Components with the same name or the same reference numeral represent similar or identical structures and are limited to illustrative purposes.

[0029] Figure 1 This is a schematic diagram of the piston ring circumferential surface grinding device of the present invention. The piston ring circumferential surface grinding device includes a first support member A1 and a second support member A2 with two axes arranged substantially parallel to each other. During grinding, one of the first support member A1 and the second support member A2 is located inside the piston ring blank W, pressing against the inner circular surface S1 of the piston ring blank W; the other is located outside the piston ring blank W, pressing against the outer circular surface S2 of the piston ring blank W. It can be understood that when the position of one of the first support member A1 and the second support member A2 can be adjusted, a certain clamping force is applied to bring the first support member A1 and the second support member A2 closer together. At this time, if the piston ring blank W is located between the first support member A1 and the second support member A2, under the action of the clamping force, if the influence of rotation is not considered, the piston ring blank W will naturally be squeezed between the first support member A1 and the second support member A2, and will be tangential to both. One of the first support member A1 and the second support member A2 is a drive member 11 used to drive the piston ring blank W to rotate in the grinding state, and the other is a grinding head 12 used to grind the circumferential surface of the piston ring blank W. There is a speed difference between the linear velocity of the first support member A1 at the contact point with the piston ring blank W and the linear velocity of the second support member A2 at the contact point with the piston ring blank W. When the drive member 11 drives the piston ring blank W to rotate at a basically the same speed through the frictional force at the contact surface, there is a difference between the linear velocity of the piston ring blank W and the linear velocity of the grinding head 12, which allows the grinding head 12 to complete the grinding of the surface of the piston ring blank W. Since the piston ring blank W rotates during grinding, this can simultaneously achieve grinding of all areas of the circumferential surface of the piston ring blank W. When the drive member 11 is located inside the piston ring blank W, the piston ring circumferential surface grinding device of the present invention achieves grinding and deburring of the inner circular surface of the piston ring blank W; the circumferential surface in the text can refer to either the inner circular surface S1 or the outer circular surface S2. When the driving component 11 is located outside the piston ring blank W, the piston ring circumferential surface grinding equipment can grind and deburr the outer circumferential surface of the piston ring blank W. Since the piston ring blank W does not rotate around a fixed axis, but rather rotates locally through the pressing position between the driving component 11 and the grinding head 12, regardless of the cross-section of the piston ring blank W in its free state, it can ensure that the circumferential surface of the piston ring blank W can stably pass through the grinding position between the driving component 11 and the grinding head 12, resulting in uniform grinding treatment.

[0030] Figure 2This is a schematic diagram illustrating a further improvement to the above principle. During the aforementioned grinding process, both the first support member A1 and the second support member A2 are pressed against the piston ring blank W. This is achieved by elastically floating the position of one of the first support member A1 and the second support member A2. Therefore, at least one of the first support member A1 and the second support member A2 is elastically pressed against the circumferential surface of the piston ring blank W during grinding. To achieve this function, the mounting shaft of at least one of the first support member A1 and the second support member A2 can be elastically fixed to the frame via the elastic member 13 during the grinding operation.

[0031] Figure 3 A specific embodiment of a piston ring circumferential surface grinding device is given. Figure 4 for Figure 3 A schematic diagram of the structure is shown. The grinding head 12 is placed inside the piston ring blank W to perform grinding operations on the inner circular surface S1 of the piston ring blank W. The driving component 11 is placed outside the piston ring blank W to drive the piston ring blank W to rotate, and the grinding head 12 performs grinding on various parts of the circumference of the piston ring blank W. The relative distance between the driving component 11 and the grinding head 12 is adjustable. When the distance between the driving component 11 and the grinding head 12 is large, the piston ring circumferential surface grinding equipment is in a position where... Figure 3 With the drive unit 11 in the open position, the piston ring blank W can be fitted onto the grinding head 12. When the distance between the drive unit 11 and the grinding head 12 is small, the piston ring circumferential surface grinding equipment is in the open position. Figure 3 The polishing state,

[0032] The piston ring blank W is partially pressed between the drive component 11 and the grinding head 12. Figure 3 The driver 11 and the punch are given

[0033] One configuration allows for adjustable spacing between the grinding heads 12. The drive unit 11 can be placed on the floating frame 14. The floating frame 14 rotates around a horizontal plane.

[0034] A rotating shaft O along the axis of the grinding head 12 is rotatably configured, allowing the grinding head 12 to move away from or towards the drive member 11 via the rotation of the floating frame 14. A telescopic component 15 can also be rotatably connected or hinged to the floating frame 14, with the other end of the telescopic component 15 rotatably or hingedly fixed. The controlled extension and retraction of the telescopic component 15 controls the rotation of the floating frame 14 around the rotating shaft O. The telescopic component 15 can be a cylinder, hydraulic cylinder, or other power components. After the grinding head 12 is pressed, the telescopic component 15 can function similarly to an elastic component 13, ensuring that the grinding head 12 is elastically pressed against the surface of the piston ring blank W. That is, on the one hand, the grinding head 12 can be pressed with a certain pre-pressure; on the other hand, due to the characteristics of the floating frame 14, it has a certain amount of extension and retraction at the resting position, providing elastic stiffness during extension and retraction to achieve elastic positional changes of the grinding head 12. Preferably, a duckbill rod 16 can also be provided on the inner side of the piston ring blank W, above the grinding head 12, for suspending the piston ring blank W. Its function is to suspend the piston ring blank W directly on the duckbill lever 16 during the grinding process, without prematurely contacting the grinding head 12. Without the duckbill lever 16, when the piston ring blank W is placed directly on the grinding head 12, if the grinding head 12 starts rotating before the drive component 11 has pressed the piston ring blank W firmly onto it, the grinding head 12 will drive the piston ring blank W to move randomly. This could lead to misalignment and overlap between multiple piston ring blanks W, causing the drive component 11 to be lifted by the piston ring blank W, preventing it from pressing the piston ring blank W firmly. Furthermore, using the duckbill lever 16 to suspend the piston ring when the grinding head 12 is open, instead of directly suspending the piston ring blank W on the grinding head 12, also facilitates the loading and unloading of the piston ring blank W, avoiding obstruction by the grinding head 12 when removing the piston ring blank W axially.

[0035] In the actual grinding process, multiple piston ring blanks W can be axially fitted onto the grinding head 12. To ensure stable contact and stable driving between the driving component 11 and each piston ring blank W, the driving component 11 can be made of an elastic material, such as rubber. Figure 5As shown, based on the same considerations, one of the drive component 11 and the grinding head 12 is preferably floating. Here, "floating" means that the rotational axis positions of the drive component 11 and the grinding head 12 can be elastically fine-tuned to better match the actual state of each piston ring blank W in the grouped piston ring blanks W. Taking the floating configuration of the drive component 11 as an example, both ends of the drive component 11's rotational axis can be elastically positioned on the floating frame 14. This can be achieved through elastic connectors 111 located at both ends of the drive component 11, connecting the floating frame 14 and the drive component 11's rotational axis. In fact, it is also possible to achieve the floating configuration of the drive component 11 by directly elastically positioning both ends of the rotational axis O of the floating frame 14 to achieve the overall floating configuration of the floating frame 14. When the grinding position of some piston ring blanks W is thicker than that of other piston ring blanks W, the drive component 11 will be pushed back at the corresponding end, thereby compressing the corresponding elastic connector 111, increasing the clamping force on the piston ring blank W, thereby accelerating the grinding of the piston ring blank W at that position, solving the problem of uneven growth of burrs and other materials to be removed on the piston ring blank W, and achieving uniform grinding of the piston ring blank W.

[0036] During grinding, multiple piston ring blanks W are sequentially mounted on the grinding head 12. To facilitate the loading and unloading of the piston ring blanks W, the grinding head 12 is typically connected to a frame at one end, with the other end forming a free, cantilevered shape. Loading and unloading of the piston ring blanks W is achieved from the free end of the grinding head 12. However, during grinding, the piston ring blanks will rotate on the grinding head 12 and may therefore undergo axial displacement, potentially causing them to detach from the free end of the grinding head 12. This not only affects the completion of the grinding operation but may also pose a safety risk. To avoid this problem, a movable baffle 17 can be installed on one side of the free end of the grinding head 12. The position of the movable baffle 17 is controllably movable. During loading and unloading operations, it moves away from the front of the free end of the grinding head 12, allowing the piston ring blanks W to enter and exit the grinding head 12. During the grinding operation, the movable baffle 17 returns to a position close to the free end of the grinding head 12, and the gap between the movable baffle 17 and the free end of the grinding head 12 does not exceed the wall thickness of a single piston ring blank W. Once the movable baffle 17 is positioned in front of the free end of the grinding head 12, due to the obstruction of the movable baffle 17, any piston ring blank W will not be able to come off the grinding head 12 along the axis, thus achieving reliable blocking of the piston ring blank W and preventing it from coming off the grinding head 12.

[0037] For the specific implementation of the grinding process in the above specific embodiments, a specific example is also provided here. The rotational speed of the drive component 11 is 311 r / min, and the rotational speed of the grinding head 12 is 2900 r / min. The drive component 11 is a rubber roller with a certain elasticity to ensure stable driving of any piston ring blank W. Under the above speed difference, the inner circle of the piston ring blank W can be stably ground by the grinding head 12.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A piston ring circumferential surface grinding device, used for grinding the circumferential surface of a piston ring blank (W), characterized in that, It includes a first support member (A1) and a second support member (A2); During the grinding operation, the first support (A1) is placed inside the piston ring blank (W) and contacts the inner circular surface of the piston ring blank (W). (S1), the second support member (A2) is placed on the outside of the piston ring blank (W) and contacts the outer circular surface (S2) of the piston ring blank (W); the first One of the support member (A1) and the second support member (A2) is a drive member (11) that drives the piston ring blank (W) to rotate, and the other is a grinding head (12) that grinds the circumferential surface of the piston ring blank (W); there is a speed difference between the linear velocity of the drive member (11) at the contact point with the piston ring blank (W) and the linear velocity of the grinding head (12) at the contact point with the piston ring blank (W); The drive component (11) elastically presses against the circumferential surface of the piston ring blank (W); The distance between the drive member (11) and the grinding head (12) is adjustable; in the open state, the distance is widened to complete the loading and unloading of the piston ring blank (W); in the grinding state, the distance is narrowed so that the drive member (11) and the grinding head (12) clamp the piston ring blank (W). The drive unit (11) is placed on the floating frame (14), which is rotatably mounted around a pivot (O) parallel to the axis of the grinding head (12). The distance between the grinding head (12) and the drive unit (11) is adjusted by rotating the floating frame (14). The floating frame (14) is hinged to a telescopic component (15), and the other end of the telescopic component (15) is hinged and fixed; the telescopic component (15) is controlled to extend and retract to control the rotation of the floating frame (14) around the pivot (O); in the grinding state, the telescopic component (15) provides the drive member (11) with an elastic clamping force to press the piston ring blank (W); The two ends of the rotating shaft of the drive member (11) are elastically floating relative to the rotation center line of the grinding head (12). The floating setting means that the position of the rotating shaft of the drive member (11) and the grinding head (12) can be elastically fine-tuned to better match the actual state of each piston ring blank (W) in the group of piston ring blanks (W); the position of the rotating shaft of the drive member (11) is elastically fine-tuned to adapt to the differences of the group of piston ring blanks (W) placed on the grinding head (12). The two ends of the rotating shaft of the drive component (11) are elastically set through the elastic connecting parts (111) between the connecting floating frame (14) at both ends of the drive component (11) and the rotating shaft of the drive component (11); When the grinding position of some piston ring blanks (W) is thicker than that of other piston ring blanks (W), the drive (11) will be pushed back at the corresponding end, thereby compressing the corresponding elastic connector (111), increasing the clamping force on the piston ring blank (W), and thus accelerating the grinding of the piston ring blank (W) at that position.

2. The piston ring barrel facing apparatus as described in claim 1, wherein, One end of the grinding head (12) is connected to The frame is connected, and the other end forms a free end that extends freely; the grinding head (12) is cantilevered.

3. The piston ring barrel facing apparatus as defined in claim 2 wherein, It also includes a movable baffle (17), which is active The movable baffle (17) is located on one side of the free end of the grinding head (12); during loading and unloading operations, the movable baffle (17) moves away from the grinding head (12). Open the front of the free end of the grinding head (12); during the grinding operation, the movable baffle (17) returns to the position close to the free end of the grinding head (12), and the gap between the movable baffle (17) and the free end of the grinding head (12) does not exceed the wall thickness of the single piston ring blank (W).

4. The piston ring barrel facing apparatus as described in claim 1, wherein, The first support member (A1) is a grinding head (12) used for grinding the inner circular surface (S1) of the piston ring blank (W); Alternatively, the second support member (A2) is a grinding head (12) used for grinding the outer circular surface (S2) of the piston ring blank (W).

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