A test method for the bonding strength of engine piston wear-resistant coating

Abstract

The present invention provides a method for testing the bonding strength of an engine piston wear-resistant coating, and relates to the technical field of engine pistons. The method for testing the bonding strength of an engine piston wear-resistant coating uses a bonding strength testing device, which includes a first support seat, a reaction frame, a second support seat, an actuator, a first connecting seat, a first bonding seat, a second connecting seat, a second bonding seat, a stress sensor, an insulation box, a temperature sensor, a heater, a cooler, a force control acquisition unit, and a temperature control unit; the method includes the following steps: Step 1, bonding before testing; Step 2, temperature simulation; Step 3, force testing and recording. The testing method of the present invention is simple and reliable in testing operation, and can accurately measure the bonding strength of the piston wear-resistant coating at different temperatures, which can be used as an important indicator to test whether the wear-resistant coating is qualified, and provide data support for judging whether the piston wear-resistant coating meets the process requirements.

Description

Technical Field

[0001] The invention relates to the technical field of engine pistons, in particular to a method for testing the bonding strength of a wear-resistant coating of an engine piston. Background Art

[0002] During the operation of the engine, the friction loss between the piston assembly and the cylinder bore accounts for about 45%-65% of the total friction loss of the internal combustion engine, of which the friction loss of the piston skirt accounts for about 25% of the total friction loss. At present, in order to reduce the friction loss of the piston and improve the wear resistance of the piston, a wear-resistant coating is usually applied to the piston skirt. The wear-resistant coating applied to the surface of the piston skirt has a positive effect on the friction loss under the mixed friction state, increases the wear resistance and effectively prevents the piston from biting. At present, high-quality wear-resistant coatings can reduce the friction loss of the piston by about 35% and improve the wear resistance by about 30%. In the process of coating the wear-resistant coating on the piston skirt, factors such as coating materials, coating processes (such as coating curing temperature, curing time, etc.), piston materials, cleanliness of the piston skirt, and knife pattern morphology will affect the bonding strength between the wear-resistant coating and the piston skirt. If the bonding strength between the wear-resistant coating and the skirt is insufficient, the wear-resistant coating of the piston will fall off during the operation of the engine, resulting in increased friction loss of the engine, which seriously affects the normal operation of the piston and causes cylinder scuffing. Therefore, testing the bonding strength of the piston wear-resistant coating is an important indicator for testing whether the wear-resistant coating is qualified. It is the key to ensure that the engine effectively reduces friction losses and improves the wear resistance of the piston. It is of great significance to energy saving and consumption reduction, improving fuel utilization and ensuring efficient operation of the engine. Summary of the invention

[0003] The purpose of the present invention is to provide a method for testing the bonding strength of an engine piston wear-resistant coating, so as to measure the bonding strength of the piston wear-resistant coating.

[0004] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A method for testing the bonding strength of an engine piston wear-resistant coating, using a bonding strength testing device, the bonding strength testing device comprising a first support seat, a reaction frame, a second support seat, an actuator, a first connecting seat, a first bonding seat, a second connecting seat, a second bonding seat, a stress sensor, an insulation box, a temperature sensor, a heater, a cooler, a force control acquisition unit and a temperature control unit;

[0006] The first support seat is connected to the second support seat via a reaction frame, the cylinder end of the actuating cylinder is arranged on the first support seat, the telescopic end of the actuating cylinder is arranged with the first connecting seat, the end of the first connecting seat is arranged with the first bonding seat, the second support seat is arranged with the second connecting seat, and the end of the second connecting seat is arranged with the second bonding seat;

[0007] The stress sensor is connected between the telescopic end of the actuator and the first connecting seat;

[0008] The temperature sensor, heater and cooler are arranged in the incubator;

[0009] The force control acquisition unit is connected to the control end of the actuator and the stress sensor via signal cables respectively;

[0010] The temperature control unit is connected to the temperature sensor, the heater and the cooler via signal cables respectively;

[0011] The method comprises the following steps:

[0012] Step 1: Bonding before testing

[0013] The end of the first bonding seat is bonded to the wear-resistant coating of the skirt on one side of the piston by strong glue, and the end of the second bonding seat is bonded to the wear-resistant coating of the skirt on the other side of the piston by strong glue, and the piston is placed inside the heat preservation box;

[0014] Step 2: Temperature simulation

[0015] The temperature control unit controls the temperature inside the incubator to be within the set temperature range and maintain the set temperature for the set time through the temperature sensor, heater and cooler;

[0016] Step 3: Force test and record

[0017] The force control and acquisition unit sets the loading rate of the actuator cylinder. The force control and acquisition unit triggers the telescopic end of the actuator cylinder to retract relative to the cylinder end at the set loading rate. At the same time, the force value of the actuator cylinder is gradually increased. The force control and acquisition unit records the stress value in real time through the stress sensor. When the stress value recorded by the stress sensor in real time is zero, the loading of the actuator cylinder is stopped, and the maximum stress value before the stress value is zero is recorded. The maximum stress value is the bonding strength of the piston wear-resistant coating.

[0018] Preferably, the end of the first connecting seat is detachably connected to the first adhesive seat, and the end of the second connecting seat is detachably connected to the second adhesive seat.

[0019] Preferably, the end of the first connecting seat is connected to the first adhesive seat via bolts, and the end of the second connecting seat is connected to the second adhesive seat via bolts.

[0020] Preferably, the ends of the first adhesive seat and the second adhesive seat are arranged in an arc shape that matches the outer contour of the piston skirt.

[0021] Preferably, the force control acquisition unit and the temperature control unit are respectively connected to the main controller via signal cables.

[0022] Preferably, the main controller is configured as a PLC controller.

[0023] Preferably, the actuating cylinder is configured as a hydraulic cylinder.

[0024] The beneficial technical effects of the present invention are:

[0025] The testing method for the bonding strength of the engine piston wear-resistant coating of the present invention is simple and reliable in testing operation, and can accurately measure the bonding strength of the piston wear-resistant coating at different temperatures as an important indicator for testing whether the wear-resistant coating is qualified, thereby providing data support for judging whether the piston wear-resistant coating meets the process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a method for testing the bonding strength of a wear-resistant coating on an engine piston according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a visual observation device for piston lubrication according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure in which the first bonding seat and the second bonding seat of the embodiment of the present invention are bonded to the piston skirt by strong glue;

[0029] Figure 4 This is a diagram showing changes in stress values ​​recorded in real time by a stress sensor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more comprehensively with reference to the accompanying drawings, in which some but not all embodiments will be shown. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided so that the present invention meets applicable legal requirements.

[0031] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In an embodiment of the present invention, a method for testing the bonding strength of an engine piston wear-resistant coating is provided. Please refer to Figures 1 to 4 shown.

[0033] A method for testing the bonding strength of an engine piston wear-resistant coating, using a bonding strength testing device, the bonding strength testing device comprising a first support seat 11, a reaction frame 12, a second support seat 13, an actuator 2, a first connecting seat 311, a first bonding seat 321, a second connecting seat 312, a second bonding seat 322, a stress sensor 4, an insulation box 5, a temperature sensor 51, a heater 52, a cooler 53, a force control collection unit and a temperature control unit.

[0034] The first support seat 11 is connected to the second support seat 13 via the reaction frame 12, the actuator 2 is set as a hydraulic cylinder, the cylinder end of the actuator 2 is fixedly connected to the first support seat 11, the telescopic end of the actuator 2 is fixedly connected to the first connection seat 311, the end of the first connection seat 311 is detachably connected to the first bonding seat 321, the second support seat 13 is fixedly connected to the second connection seat 312, and the end of the second connection seat 312 is detachably connected to the second bonding seat 322. Among them, the end of the first connection seat 311 is connected to the first bonding seat 321 via bolts, and the end of the second connection seat 312 is connected to the second bonding seat 322 via bolts. The first bonding seat 321 and the second bonding seat 322 are disassembled to facilitate the glue coating operation between the first bonding seat 321, the second bonding seat 322 and the piston 6. The ends of the first adhesive seat 321 and the second adhesive seat 322 are set to be arc-shaped to match the outer contour of the skirt of the piston 6, so that the first adhesive seat 321 and the second adhesive seat 322 are closely matched with the outer contour of the skirt of the piston 6 and are firmly bonded by the strong glue 7.

[0035] A stress sensor 4 is connected between the telescopic end of the actuator 2 and the first connection seat 311. In this way, during the force test, the stress of the telescopic end of the actuator 2 and the first connection seat 311 is monitored by the stress sensor 4, and the stress is also the force applied to the wear-resistant coating 61 to separate from the skirt of the piston 6 in real time.

[0036] The force control acquisition unit is connected to the control end of the actuator 2 and the stress sensor 4 via signal cables. The force control acquisition unit is used to set the loading rate of the actuator 2, trigger the telescopic end of the actuator 2 to retract relative to the cylinder end at the set loading rate, and gradually increase the force value of the actuator 2. The stress value monitored in real time by the stress sensor 4 is uploaded to the force control acquisition unit.

[0037] A temperature sensor 51, a heater 52 and a cooler 53 are arranged in the insulated box 5. The temperature sensor 51 is used to monitor the temperature in the insulated box 5 in real time. The heater 52 is specifically configured as a heating lamp, and the heater 52 is turned on to heat to increase the temperature in the insulated box 5. The cooler 53 is configured as an evaporator of the air conditioning system, and the cooler 53 operates to absorb heat in the insulated box 5 to reduce the temperature in the insulated box 5.

[0038] The temperature control unit is connected to the temperature sensor 51, the heater 52 and the cooler 53 via signal cables. The temperature value monitored in real time by the temperature sensor 51 is uploaded to the temperature control unit. The temperature control unit is also used to control the switch of the heater 52 and the operation stop of the cooler 53 according to the temperature monitored in real time by the temperature sensor 51, so as to control the inside of the incubator 5 to be within the set temperature range.

[0039] The force control acquisition unit and the temperature control unit are respectively connected to the main controller via signal cables, wherein the main controller is set as a PLC controller, and the PLC controller is connected to a computer so that various parameters required for the test process can be set through the computer via the PLC controller.

[0040] The method comprises the following steps:

[0041] Step 1: Bonding before testing

[0042] The end of the first bonding seat 321 is bonded to the wear-resistant coating 61 on the skirt of one side of the piston 6 through super glue 7, and the end of the second bonding seat 322 is bonded to the wear-resistant coating 61 on the skirt of the other side of the piston 6 through super glue 7, and the piston 6 is placed inside the insulation box 5.

[0043] Step 2: Temperature simulation

[0044] The temperature control unit controls the temperature inside the heat preservation box 5 to be within a set temperature range and maintain it for a set time through the temperature sensor 51, the heater 52 and the cooler 53.

[0045] Step 3: Force test and record

[0046] The force control acquisition unit sets the loading rate of the actuator 2. The force control acquisition unit triggers the telescopic end of the actuator 2 to retract relative to the cylinder end at the set loading rate. At the same time, the force value of the actuator 2 is gradually increased. The force control acquisition unit records the stress value in real time through the stress sensor 4. When the stress value recorded in real time by the stress sensor 4 is zero ( Figure 4 At time t0, the loading of the actuator 2 is stopped. The force control acquisition unit uploads the real-time recorded stress value to the main controller and outputs it through the computer. When the stress value is zero, it means that the wear-resistant coating 61 falls off from the skirt of the piston 6. The maximum stress value before the stress value is zero is recorded. The maximum stress value is the bonding strength of the piston wear-resistant coating.

[0047] So far, the present embodiment has been described in detail in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the test method for the bonding strength of the wear-resistant coating of the engine piston of the present invention. The test method for the bonding strength of the wear-resistant coating of the engine piston of the present invention is simple and reliable to operate, and can accurately measure the bonding strength of the wear-resistant coating of the piston at different temperatures as an important indicator for testing whether the wear-resistant coating is qualified, and provide data support for judging whether the wear-resistant coating of the piston meets the process requirements.

[0048] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the bonding strength of an engine piston wear-resistant coating, characterized in that: A bonding strength testing device is used, which includes a first support seat, a reaction frame, a second support seat, an actuator, a first connecting seat, a first bonding seat, a second connecting seat, a second bonding seat, a stress sensor, an incubator, a temperature sensor, a heater, a cooler, a force control acquisition unit, and a temperature control unit; The first support seat is connected to the second support seat via a reaction frame, the cylinder end of the actuator cylinder is arranged on the first support seat, the telescopic end of the actuator cylinder is arranged with the first connection seat, the end of the first connection seat is arranged with the first bonding seat, the second support seat is arranged with the second connection seat, the end of the second connection seat is arranged with the second bonding seat, and the ends of the first bonding seat and the second bonding seat are arranged with arc shapes adapted to the outer contour of the piston skirt; The stress sensor is connected between the telescopic end of the actuator and the first connecting seat; The temperature sensor, heater and cooler are arranged in the incubator; The force control acquisition unit is connected to the control end of the actuator and the stress sensor via signal cables respectively; The temperature control unit is connected to the temperature sensor, the heater and the cooler via signal cables respectively; The method comprises the following steps: Step 1: Bonding before testing The end of the first bonding seat is bonded to the wear-resistant coating of the skirt on one side of the piston by strong glue, and the end of the second bonding seat is bonded to the wear-resistant coating of the skirt on the other side of the piston by strong glue, and the piston is placed inside the heat preservation box; Step 2: Temperature simulation The temperature control unit controls the temperature inside the incubator to be within the set temperature range and maintain the set time through the temperature sensor, heater and cooler; Step 3: Force test and record The force control and acquisition unit sets the loading rate of the actuator cylinder. The force control and acquisition unit triggers the telescopic end of the actuator cylinder to retract relative to the cylinder end at the set loading rate. At the same time, the force value of the actuator cylinder is gradually increased. The force control and acquisition unit records the stress value in real time through the stress sensor. When the stress value recorded by the stress sensor in real time is zero, the loading of the actuator cylinder is stopped, and the maximum stress value before the stress value is zero is recorded. The maximum stress value is the bonding strength of the piston wear-resistant coating.

2. The method for testing the bonding strength of an engine piston wear-resistant coating according to claim 1, characterized in that: The end of the first connecting seat is detachably connected to the first adhesive seat, and the end of the second connecting seat is detachably connected to the second adhesive seat.

3. A method for testing the bonding strength of an engine piston wear-resistant coating according to claim 2, characterized in that: The end of the first connecting seat is connected to the first bonding seat via bolts, and the end of the second connecting seat is connected to the second bonding seat via bolts.

4. The method for testing the bonding strength of an engine piston wear-resistant coating according to claim 1, characterized in that: The force control acquisition unit and the temperature control unit are connected to the main controller via signal cables respectively.

5. A method for testing the bonding strength of an engine piston wear-resistant coating according to claim 4, characterized in that: The main controller is configured as a PLC controller.

6. The method for testing the bonding strength of an engine piston wear-resistant coating according to claim 1, characterized in that: The actuating cylinder is configured as a hydraulic cylinder.

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