Laser hardening process for inspection templates of aero-engine parts

Abstract

This invention relates to a laser quenching process for aero-engine component inspection templates, belonging to the field of heat treatment methods for component inspection templates. The process includes: determining a set of processing parameters for a laser cladding equipment; obtaining dimensional parameters of the working surface on the inspection template; inputting the dimensional parameters into the laser cladding equipment to form a 3D printing trajectory; placing and fixing the inspection template in the processing area of ​​the laser cladding equipment; obtaining the material grade of the inspection template; starting the laser cladding equipment and adjusting its parameters according to the set and the material grade; and performing laser quenching on the laser head mounted on the mechanical gripper of the laser cladding equipment according to the 3D printing trajectory, forming a standard working hardness surface on the inspection template that meets the design requirements. This avoids easy deformation and unstable hardness of the template, improving production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of part inspection template processing methods, and particularly relates to a laser quenching process for an aero-engine part inspection template. Background Technology

[0002] There are many template-type measuring tools, especially various surface templates. These templates have diverse shapes and complex curves, requiring high precision and generally have wear resistance requirements. Heat treatment is a major challenge in manufacturing. Templates primarily use the working surface, which only needs to have high hardness and wear resistance; other parts can have lower hardness. Localized quenching is employed.

[0003] In existing technologies, the sample is quenched as a whole, which requires high skill in heat treatment operations and is prone to deformation and cracking. Because the hardness of the whole quenching is high and the stress is large, deformation correction is difficult, and subsequent machining is also difficult. Surface grinding and wire cutting cause large deformations and may also cause cracks.

[0004] Existing methods employ high-frequency local quenching, requiring each shape of the template to have a corresponding inductor heater, which is complex and expensive.

[0005] Therefore, since these measurement samples are produced in large quantities, using traditional heat treatment processes would inevitably result in a large number of scraps and low production efficiency.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a laser hardening process for inspection templates of aero-engine parts, solving the technical problem of low production efficiency caused by high-frequency local hardening or overall hardening methods in the prior art. The technical solution of this invention has many beneficial effects, as described below:

[0008] A process method for laser quenching of inspection templates for aero-engine parts is provided, which uses laser cladding equipment for quenching heat treatment. The process method includes:

[0009] Determine the set of processing parameters for the laser cladding equipment;

[0010] Obtain the dimensional parameters of the working surface on the inspection template;

[0011] The dimensional parameters are input into the laser cladding equipment to form a 3D printing trajectory;

[0012] The test sample is placed in the processing area of ​​the laser cladding equipment and fixed in place.

[0013] Obtain the material grade of the test sample, start the laser cladding equipment and adjust the parameters according to the set and its material grade. The laser head installed on the mechanical gripper of the laser cladding equipment performs laser hardening according to the 3D printing trajectory to form a standard working hardness surface that meets the design requirements on the test sample.

[0014] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0015] The method provided here only requires a working surface with high hardness and wear resistance. Therefore, laser local quenching is used to avoid the situation where the working surface of the sample is easily deformed and the hardness is unstable, thereby improving the efficiency of mass production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0017] Figure 1 This is a schematic diagram of the method of the present invention. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0020] The purpose of this invention is to utilize laser cladding equipment to explore a process that can meet the requirements of laser quenching of templates, program the laser on the robotic arm to move along the complex working surface curve of the template, and control the laser output power, height, and walking speed parameters.

[0021] like Figure 1 The process method for laser hardening of the aero-engine part inspection sample shown herein uses a laser cladding equipment for hardening. The preferred model of the laser cladding equipment is I LAM-R60K-300. The process method includes:

[0022] S101: Determine the set of processing parameters for the laser cladding equipment, specifically:

[0023] Test samples of different materials are selected for testing, referred to as test samples, and the corresponding quenching hardness standards of the materials are obtained;

[0024] The test dimension parameters of the working surface on the test sample are obtained and input into the laser cladding equipment to form the test 3D printing trajectory;

[0025] Adjust the height distance of the working surface on the laser head near-distance test sample, select the corresponding laser output power and mechanical gripper walking speed at the current height distance, record them, and start the laser cladding equipment to carry out the quenching heat treatment process.

[0026] Determining the depth of the quenched surface:

[0027] After quenching, check whether the depth of the hardened layer on the quenched surface meets the minimum depth of the designed hardened surface. If so, determine and store the currently selected height distance, walking speed, and laser output power. If not, adjust the current height distance, walking speed, and laser output power until the depth of the tested surface is equal to the minimum depth of the designed surface, and store the adjusted height distance, walking speed, and laser output power.

[0028] Determine the range of hardness layer depths that can be quenched on the working surface under the current material, and form a set.

[0029] Form a set

[0030] Change the material of the test sample and repeat the test according to the above method to obtain the range of hardness layer depth of the quenched working surface after changing the material, and form a set, see Table 1. Test the test samples of different materials to obtain the range of hardness layer depth of quenching and the corresponding parameters.

[0031] The working principle of the experiment

[0032] The greater the distance between the laser head and the surface of the part, the larger the laser spot and the larger the heating area. However, at a certain point, the power will be insufficient, the temperature will be too low, and the part will not achieve the required hardness. Increasing the depth of the hardened layer can be achieved by increasing the power or slowing down the laser spot speed. Slowing down the laser spot speed is preferable, as high power makes the surface more prone to melting.

[0033] The test sample can be high in alloy composition (such as CrWMn, Cr12MoV, etc.). The microstructure transformation is affected by the alloy composition. High alloy composition has the effect of inhibiting the microstructure transformation, resulting in a slower microstructure transformation or slower heat transfer rate, and a smaller heating depth and width. The heating time should be appropriately extended (by slowing down the laser head travel speed).

[0034]

[0035] Table 1

[0036] S102: Obtain the dimensional parameters of the working surface on the inspection template. The dimensional parameters can be curved, rhomboid, square, or other shapes.

[0037] S103: Dimensional parameters are input into the laser cladding equipment to form a 3D printing trajectory. Specifically:

[0038] Laser cladding equipment can only receive parameters formed by coordinate points, converting the dimensions of the profile (which can be any shape on a plane) of the quenched part into parameter dimensions in the form of coordinate points, and generating a printing trajectory.

[0039] S104: The test sample is placed and fixed in the processing area of ​​the laser cladding equipment. The working surface is located on the side or front of the test sample, whichever is chosen according to the specifications, design requirements, or subjective requirements.

[0040] S105: Obtain the material grade of the current test sample (e.g., the material grade of the test sample is T7A-T). 12 A. CrWMn or Cr 12MoV), start the laser cladding equipment and adjust the parameters according to the above set and material grade (see Table 1 to select laser power, height, and travel speed). The laser head installed on the mechanical gripper of the laser cladding equipment performs laser hardening according to the 3D printing trajectory. The 3D printing trajectory serves as the working hardness surface in the current test template. The laser hardening forms a standard working hardness surface on the test template that meets the design drawing requirements. It is sufficient to meet the minimum standard required by the design drawing.

[0041] The product provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the invention claims.

Claims

1. A process for laser hardening of inspection templates for aero-engine parts, characterized in that, Heat treatment using laser cladding equipment and quenching process includes: A set of processing parameters for laser cladding equipment is determined, in which test samples of different materials are selected for testing, and the corresponding quenching hardness standards and quenching depth standards are obtained. The test dimension parameters of the working surface on the test sample are obtained and input into the laser cladding equipment to form a test 3D printing trajectory. The height distance of the laser head to the working surface on the test sample is adjusted, and the laser output power and mechanical gripper walking speed corresponding to the current height distance are selected and recorded. The laser cladding equipment is then started for quenching. After quenching, it is checked whether the depth of the tested processing surface is equal to the minimum depth of the designed processing surface. If so, the currently selected height distance, walking speed, and laser output power are determined and stored. If not, the current height distance, walking speed, and laser output power are adjusted until the depth of the tested processing surface is equal to the minimum depth of the designed processing surface, and the adjusted height distance, walking speed, and laser output power are stored. Obtain the dimensional parameters of the working surface on the inspection template; The dimensional parameters are input into the laser cladding equipment to form a 3D printing trajectory; The test sample is placed in the processing area of ​​the laser cladding equipment and fixed in place. Obtain the material grade of the test sample, start the laser cladding equipment and adjust the parameters according to the set and its material grade. The laser head installed on the mechanical gripper of the laser cladding equipment performs laser hardening according to the 3D printing trajectory, and then a standard working hardness surface that meets the design requirements is formed on the test sample.

2. The process method according to claim 1, characterized in that, The set of processing parameters for laser cladding equipment also includes: Adjust the height distance, travel speed, and laser output power of the laser cladding equipment to test the maximum hardness layer depth on the working surface of the test sample under the current material, and store the height distance, travel speed, and laser output power corresponding to the maximum hardness layer depth; Determine the range of the minimum and maximum machining depth of the hardened working surface that can be quenched under the current material, and form a set.

3. The process method according to claim 2, characterized in that, The set of processing parameters for laser cladding equipment also includes: Change the material of the test sample, obtain the range of hardness layer depth of the quenched working surface after the material change, and form a set.

4. The process method according to claim 1, characterized in that, The material grade of the test sample is T7A-T. 12 A. CrWMn or Cr 12 MoV.

5. The process method according to claim 1, characterized in that, The working surface is located on the side or front of the test sample.

6. The process method according to claim 1, characterized in that, The model of the laser cladding equipment is ILAM-R60K-300.

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