An adaptive coating positioning jig for a profiled piston ring

Abstract

The utility model relates to the technical field of fixture, concretely to a kind of self-adapting film-coated positioning fixture for special-shaped piston ring, including center positioning part, it is characterized by: a set of positioning clamping groove is fixedly installed in the back of center positioning part, adjustable insert piece is movably inserted in positioning clamping groove.This fixture is combined design by inner ring adjusting assembly, outer ring fixed assembly, gap positioning, the occlusion structure of adjustable insert piece and positioning clamping groove is relied on by inner ring, and special-shaped part of different inner ring size can be adapted, avoid inner ring to adhere not strictly, compared with the traditional fixture that can only be fixed in single time, this fixture has multiple pieces of hanging capacity, advantage is obvious, center positioning part is designed as strip, and multiple special-shaped piston rings can be sequentially fixed along length direction, cooperate with hanging mechanism and overall immerse in film-coated solution, multiple workpieces film-coating can be completed at a time, reduce batch switching time, and production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to an adaptive coating positioning fixture for irregularly shaped piston rings. Background Technology

[0002] Piston ring coating is a technology that forms a functional thin film on the surface of piston rings through a specific process. The core purpose is to improve the wear resistance, corrosion resistance and lubrication performance of piston rings, thereby extending the service life of the engine.

[0003] Traditional fixtures are mostly designed with fixed dimensions and can only accommodate regular piston rings of specific specifications. When faced with irregularly shaped parts with notches or irregular inner rings, they cannot fit the inner ring or outer wall, and are prone to not being able to hold or fit properly. In addition, traditional fixtures are mostly single-unit designs, which can only fix 1-2 piston rings at a time, and cannot achieve simultaneous mounting of multiple parts. During mass production, fixtures need to be changed frequently, wasting a lot of time. Utility Model Content

[0004] The purpose of this invention is to provide an adaptive coating positioning fixture for irregularly shaped piston rings, so as to solve the problem of poor adaptability of traditional fixtures mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adaptive coating positioning fixture for irregularly shaped piston rings, including a central positioning component, a set of positioning slots fixedly installed on the back of the central positioning component, and an adjustable insert movably inserted into the positioning slots, thereby changing the width of the structure composed of the positioning slots and the adjustable insert by changing the insertion depth of the adjustable insert.

[0006] A connecting plate is movably inserted into the central positioning component. A threaded rod is fixedly installed on the side of the connecting plate opposite to the positioning slot. An outer fixing plate is movably sleeved on the threaded rod. A locking nut is threadedly connected to the threaded rod, and the locking nut is located on the side of the outer fixing plate opposite to the connecting plate.

[0007] Preferably, the adjustable insert has multiple equidistant protrusions, and the positioning slot has a groove corresponding to the protrusions on the adjustable insert.

[0008] Preferably, the two positioning slots are arranged symmetrically from left to right.

[0009] Preferably, a protective pressure strip is fixedly installed on the outer side of the adjustable insert.

[0010] Preferably, a set of elastic plates is fixedly installed on the side of the outer fixing plate near the central positioning member. One side of the elastic plate is fixedly installed at the center position of the outer fixing plate, and the other side of the elastic plate is raised towards the central positioning member.

[0011] Preferably, the positioning slot and the adjustable insert form an adjustable structure that can adjust the width.

[0012] Preferably, the central positioning member has a groove corresponding to the shape of the connecting plate, and the two are in clearance fit.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This fixture features a combination design of an inner ring adjustment component, an outer ring fixing component, and a notch positioning mechanism. The inner ring, relying on the interlocking structure of the positioning slot and the adjustable insert, can accommodate irregularly shaped parts with different inner ring sizes, avoiding poor fit. Compared to traditional fixtures that can only fix one piece at a time, this fixture has the ability to hang multiple pieces, offering significant advantages. The central positioning component is designed as a long strip, which can sequentially fix multiple irregularly shaped piston rings along its length. Combined with the hanging mechanism, the entire assembly is immersed in the coating solution, allowing multiple workpieces to be coated at once, reducing batch changeover time and significantly improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0017] Figure 3 This is a schematic diagram of the assembly structure of the central positioning component and connecting plate of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure at the corresponding position of the adjustable insert of this utility model.

[0019] In the diagram: 1. Center positioning component; 2. Positioning slot; 3. Adjustable insert; 4. Connecting plate; 5. Threaded rod; 6. Outer fixing plate; 7. Elastic plate; 8. Locking nut; 9. Protective pressure strip. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 4This utility model provides a technical solution: an adaptive coating positioning fixture for irregularly shaped piston rings. The central positioning component 1 is an integral elongated metal substrate made of 316L stainless steel, which has the characteristics of acid and alkali corrosion resistance and high temperature resistance. The length is designed according to the number of piston rings coated in a single process. Its cross-section is rectangular. The front of the central positioning component 1 is mirror polished to avoid scratching the inner surface of the piston ring. The groove wall of the central positioning component 1 and the connecting plate 4 are clearance fit to ensure that the connecting plate 4 can slide smoothly.

[0022] The positioning slot 2 and the adjustable insert 3 are used to adapt to the inner ring width of the irregularly shaped piston ring, thereby achieving inner ring positioning.

[0023] The positioning slot 2 consists of two symmetrically distributed cuboid metal blocks, which are vertically welded to the back of the central positioning component 1 by argon arc welding. The center line of symmetry of the two blocks coincides with the axis of the central positioning component 1.

[0024] The adjustable insert 3 has multiple equidistant trapezoidal protrusions integrally formed on the outer wall of its insertion end, which correspond to the slots opened on the positioning slot 2. The protrusions and the slots are engaged to achieve detachable fixation. The exposed end of the adjustable insert 3 is fixed with a protective pressure strip 9 by countersunk screws. The protective pressure strip 9 is made of polytetrafluoroethylene. The positioning slot 2 and the adjustable insert 3 form an adjustable width adjustment structure to adapt to irregular piston rings with different inner ring sizes.

[0025] The connecting plate 4 is a rectangular metal plate whose size is adapted to the rectangular groove on the center positioning part 1. One end is movably inserted into the rectangular groove and can slide along the axial direction of the groove; the other end is fixedly connected to one end of the threaded rod 5 by welding, and the connection is rounded.

[0026] The threaded rod 5 is a high-strength alloy threaded rod with fine threads machined on its outer surface. Its length is set according to requirements. The end away from the connecting plate 4 is used to install the outer fixing plate 6 and the locking nut 8.

[0027] The outer fixing plate 6 is a circular metal plate with a through hole in the center. The hole diameter is slightly larger than the diameter of the threaded rod. The outer fixing plate 6 is movably sleeved on the threaded rod 5 and can move freely along the axial direction of the threaded rod.

[0028] The elastic plate 7 is made of spring steel, with one end welded to the central area of ​​the outer fixed plate 6 and the other end tilted towards the central positioning part 1. It has good elastic recovery ability and can adapt to the irregular shape of the piston ring outer wall.

[0029] The locking nut 8 is a hexagonal nut that matches the threaded rod 5. It is threaded onto the threaded rod 5 and is located on the side of the outer fixing plate 6 away from the connecting insert plate 4. By tightening it, the outer fixing plate 6 can be pushed to move towards the center positioning member 1.

[0030] Working principle:

[0031] The position of the adjustable insert 3 within the positioning groove 2 is adjusted according to the size of the notch on the irregular piston ring. The protruding part of the adjustable insert 3 engages with the groove in the positioning groove 2. By changing the length of the portion of the adjustable insert 3 inserted into the positioning groove 2, the width of the structure composed of the positioning groove 2 and the adjustable insert 3 is changed, ensuring that the structure of the positioning groove 2 and the adjustable insert 3 limits the movement of the irregular piston ring. Then, the outer fixing plate 6 is installed on the threaded rod 5, so that the elastic plate 7 on the outer fixing plate 6 contacts the outer wall of the irregular piston ring, thus realizing the irregular piston ring composed of the positioning groove 2, the adjustable insert 3, and the elastic plate 7. The internal and external fixed structures are connected, with the connecting plate 4 located within the notch of the irregular piston ring. Then, the locking nut 8 on the threaded rod 5 is turned to apply pressure to the external fixed plate 6, thus reducing the distance between the external fixed plate 6, the positioning slot 2, and the adjustable insert 3, thereby limiting the movement of the irregular piston ring. Then, all the irregular piston rings are fitted onto the center positioning component 1. Finally, the entire structure is installed on the hanging mechanism. The hanging mechanism installs the structure from both sides, thus limiting the movement of the irregular piston ring on the center positioning component 1. Finally, the entire structure and the irregular piston rings on the structure are placed in the coating solution for coating operation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adaptive coating positioning fixture for irregularly shaped piston rings, comprising a central positioning element, characterized in that: A set of positioning slots is fixedly installed on the back of the central positioning component. An adjustable insert is movably inserted into the positioning slot. The width of the structure composed of the positioning slot and the adjustable insert is changed by changing the insertion depth of the adjustable insert. A connecting plate is movably inserted into the central positioning component. A threaded rod is fixedly installed on the side of the connecting plate opposite to the positioning slot. An outer fixing plate is movably sleeved on the threaded rod. A locking nut is threadedly connected to the threaded rod, and the locking nut is located on the side of the outer fixing plate opposite to the connecting plate.

2. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 1, characterized in that: The adjustable insert has multiple equidistant protrusions, and the positioning slot has a groove corresponding to the protrusions on the adjustable insert.

3. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 2, characterized in that: The two positioning slots are arranged symmetrically on the left and right.

4. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 3, characterized in that: A protective pressure strip is fixedly installed on the outer side of the adjustable insert.

5. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 4, characterized in that: A set of elastic plates is fixedly installed on the side of the outer fixing plate near the central positioning component. One side of the elastic plate is fixedly installed at the center position of the outer fixing plate, and the other side of the elastic plate is raised towards the central positioning component.

6. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 5, characterized in that: The positioning slot and the adjustable insert form an adjustable structure that can adjust the width.

7. The adaptive coating positioning fixture for irregularly shaped piston rings according to claim 6, characterized in that: The central positioning component has a groove corresponding to the shape of the connecting plate, and the two are in clearance fit.

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