Blade profile grinding interface step defect optimization method

Abstract

The present application belongs to the field of blade processing, and discloses a kind of blade profile grinding knife joint place step defect optimization method, comprising: setting several profile compensation points at blade profile grinding knife joint place step defect prone place, and fitting several profile compensation points to carry out profile reconstruction, and according to the profile after profile reconstruction, numerical control abrasive belt grinding polishing is carried out;Wherein, the height of the profile compensation point defined profile compensation point beyond blade profile original grinding surface is the profile compensation value of the profile compensation point, the profile compensation value of each profile compensation point is sequentially reduced along the pressure reduction direction of the contact wheel of numerical control abrasive belt, and the profile compensation value of the profile compensation point is not less than 0. Through the mode of profile reconstruction to compensate pressure value, the excessive grinding of numerical control abrasive belt on blade profile grinding knife joint place step defect prone place can be effectively relieved, the natural transition of polishing area and non-polishing area is realized, the purpose of not producing blade profile grinding knife joint place step defect is achieved, and the knife joint problem at the junction of polishing and non-polishing area is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of blade processing, and relates to a blade profile grinding interface step defect optimization method. BACKGROUND

[0002] As for the surface polishing of the blade type parts, the numerical control equipment grinding polishing has been widely applied to replace the traditional manual polishing, and has solved the problems of unstable quality and high labor intensity of workers in the traditional manual polishing process. However, due to the irregular structure of the blade, and the limitation of the equipment structure, there are dead angles on the profile which cannot be ground and polished by the numerical control equipment, and a clear step-shaped interface will be formed between these surfaces and the numerical control equipment grinding polishing surface, which is called blade profile grinding interface step defect.

[0003] At the same time, since the blade profile is a whole smooth surface, it is difficult to remove the blade profile grinding interface step defect formed after the numerical control equipment grinding polishing, and surface defects are easily caused. The traditional solution is to remove it by manual polishing, but the polishing difficulty is high, the polishing workers are required to be high, and the quality is also unstable. SUMMARY

[0004] The present application aims to overcome the above-mentioned shortcomings of the prior art, and provides a blade profile grinding interface step defect optimization method.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A blade profile grinding interface step defect optimization method, comprising: setting a plurality of profile compensation points at the positions prone to blade profile grinding interface step defects, fitting the plurality of profile compensation points to reconstruct the profile, and performing numerical control abrasive belt grinding polishing according to the profile after the profile reconstruction; wherein the height of the profile compensation point exceeding the original grinding surface of the blade profile is defined as the profile compensation value of the profile compensation point, the profile compensation values of the profile compensation points are sequentially reduced along the pressure reduction direction of the contact wheel of the numerical control abrasive belt, and the profile compensation values of the profile compensation points are all not less than 0.

[0007] Optionally, the length of the profile reconstruction is 1 / 20-1 / 40 of the length of the generatrix of the contact wheel of the numerical control abrasive belt.

[0008] Optionally, the profile compensation values of the profile compensation points are sorted according to an arithmetic sequence.

[0009] Optionally, the largest profile compensation value in the profile compensation values of the profile compensation points is 1 / 2-2 / 3 of the height of the historical blade profile grinding interface step defect, and the smallest profile compensation value is 0.

[0010] Optionally, the profile compensation points are set to 5.

[0011] Optionally, the method further comprises: adjusting the included angle between the contact wheel generatrix of the contact wheel of the numerical control abrasive belt and the profile tangent of the blade profile in the pressure reduction direction of the contact wheel of the numerical control abrasive belt.

[0012] Optionally, a frustum structure is arranged on the target side of the contact wheel of the numerical control abrasive belt; the target side is the side of the contact wheel of the numerical control abrasive belt close to the blade profile grinding tool junction step defect, and the diameter of the frustum structure gradually decreases in the direction close to the blade profile grinding tool junction step defect.

[0013] Optionally, the method further comprises: adjusting the included angle between the contact wheel generatrix of the contact wheel of the numerical control abrasive belt and the profile tangent of the blade profile in the pressure reduction direction of the contact wheel of the numerical control abrasive belt by 0.05°-0.5°.

[0014] Optionally, a frustum structure is arranged on the target side of the contact wheel of the numerical control abrasive belt; the target side is the side of the contact wheel of the numerical control abrasive belt close to the blade profile grinding tool junction step defect, and the diameter of the frustum structure gradually decreases in the direction close to the blade profile grinding tool junction step defect.

[0015] Optionally, the length difference between the minimum end diameter and the maximum end diameter of the frustum structure is 1 / 10 of the generatrix length of the contact wheel of the numerical control abrasive belt.

[0016] Compared with the prior art, the method has the following beneficial effects:

[0017] The blade profile grinding tool junction step defect optimization method sets a plurality of profile compensation points at the blade profile grinding tool junction step defect prone position, fits the plurality of profile compensation points to reconstruct the profile, and performs numerical control abrasive belt grinding and polishing according to the profile after the profile reconstruction. By compensating the pressure value through the profile reconstruction, the excessive grinding of the numerical control abrasive belt on the blade profile grinding tool junction step defect prone position can be effectively alleviated, the polishing area and the non-polishing area can be naturally transitioned, the blade profile grinding tool junction step defect can be avoided, and the tool junction problem at the polishing and non-polishing area interface can be effectively solved. Moreover, the profile compensation values of the profile compensation points are sequentially reduced in the pressure reduction direction of the contact wheel of the numerical control abrasive belt, so that the waviness of the ground blade profile can be effectively guaranteed within the qualified range. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A blade profile grinding tool junction step defect prone position diagram is shown.

[0019] Figure 2 is an enlarged view of A. Figure 1

[0020] Figure 3 is a profile reconstruction schematic diagram of a certain blade profile of an embodiment of the present application.

[0021] Figure 4 is an inclination angle compensation schematic diagram of a contact wheel of an embodiment of the present application.

[0022] Figure 5 is a schematic diagram of a prior art contact wheel and abrasive belt structure.

[0023] Figure 6 is a schematic diagram of a contact wheel and abrasive belt structure of an embodiment of the present application.

[0024] Wherein: 1-blade; 2-numerical control polishing dead angle area; 3-numerical control polishing area; 4-contact wheel; 5-original grinding surface of blade profile; 6-profile after profile reconstruction; 7-easy to produce blade profile grinding tool step defect; 8-abrasive belt. DETAILED DESCRIPTION

[0025] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] The present application will be described in further detail below in combination with the drawings:

[0028] Reference is made to Figure 1 and 2 ​As described in the background, due to the irregular structure of the blade 1, and due to the limitation of the equipment structure, there is a dead angle on the blade profile that cannot be numerically controlled polished, that is, a numerical control polishing dead angle area 2, and a clear blade profile grinding tool joint step defect is formed between the numerical control polishing dead angle area 2 and the numerical control polishing area 3. The blade profile grinding tool joint step defect is difficult to remove, and is easy to cause surface defects. Based on this, the present application provides a blade profile grinding tool joint step defect optimization method, which can effectively solve the tool joint problem at the joint of the polishing and non-polishing areas.

[0029] Referring to Figure 3 In an embodiment of the present application, a blade profile grinding tool joint step defect optimization method is provided, which can realize the natural transition of the numerical control polishing dead angle area 2 and the numerical control polishing area 3, and achieve the purpose of removing the blade profile grinding tool joint step defect.

[0030] Specifically, the blade profile grinding tool joint step defect optimization method comprises the following steps:

[0031] A plurality of profile compensation points are arranged at the blade profile grinding tool joint step defect prone position 7, and the plurality of profile compensation points are fitted to reconstruct the profile, and numerical control abrasive belt grinding and polishing is performed according to the profile after the profile reconstruction. Among them, the height of the profile compensation point exceeding the original grinding surface 5 of the blade profile is defined as the profile compensation value of the profile compensation point, the profile compensation values of the profile compensation points decrease in turn along the pressure reduction direction of the contact wheel 4 of the numerical control abrasive belt, and the profile compensation values of the profile compensation points are not less than 0.

[0032] The blade profile grinding tool joint step defect optimization method of the present application, a plurality of profile compensation points are arranged at the blade profile grinding tool joint step defect prone position 7, and the plurality of profile compensation points are fitted to reconstruct the profile, and numerical control abrasive belt grinding and polishing is performed according to the profile after the profile reconstruction. By compensating the pressure value through profile reconstruction, the excessive grinding of the numerical control abrasive belt on the blade profile grinding tool joint step defect prone position 7 can be effectively alleviated, the natural transition of the polishing area and the non-polishing area can be realized, and the purpose of not producing the blade profile grinding tool joint step defect can be achieved, effectively solving the tool joint problem at the joint of the polishing and non-polishing areas. And ensuring that the profile compensation values of the profile compensation points decrease in turn along the pressure reduction direction of the contact wheel 4 of the numerical control abrasive belt, which can effectively ensure that the waviness of the ground blade profile is within the qualified range.

[0033] Specifically, the processing characteristics of numerical control abrasive belt polishing are that the abrasive belt 8 rotates with the contact wheel 4, and acts on the processing surface with a fixed pressure. Among them, the pressure is transmitted to the processing surface through the contact wheel 4, and the pressure value is controlled by Hooke's law and is related to the compressed distance value of the contact wheel 4.

[0034] For the problem of polishing and non-polishing area interface, the problem can be solved by reconstructing the surface to compensate the pressure value. Specifically, the surface reconstruction is performed at the contact between the dead angle area 2 and the polishing area 3, i.e. at the step defect 7 where the blade surface grinding knife mark is prone to occur. During the surface reconstruction, the offset direction is kept along the pressure reduction direction, i.e. the surface compensation values of the surface compensation points are sequentially reduced along the pressure reduction direction of the contact wheel 4 of the numerical control abrasive belt, and the surface compensation values of the surface compensation points are not less than 0.

[0035] In a possible implementation, the length of the surface reconstruction is 1 / 20-1 / 40 of the generatrix length of the contact wheel 4 of the numerical control abrasive belt.

[0036] Specifically, the length L of the surface reconstruction, i.e. the selected length of the compensation area, should not be too large or too small. When the length L of the surface reconstruction is too large, it is easy to cause a groove on the surface. When the length L of the surface reconstruction is too small, the compensation effect is not obvious. The inventors have found in practical work that the length L of the surface reconstruction is related to the generatrix length of the contact wheel 4 of the numerical control abrasive belt, and it is more appropriate to set the length L of the surface reconstruction to 1 / 20-1 / 40 of the generatrix length of the contact wheel 4 of the numerical control abrasive belt.

[0037] In a possible implementation, the surface compensation values of the surface compensation points are sorted according to an arithmetic sequence.

[0038] Specifically, to ensure the smoothness of the surface reconstruction, the compensation values are sorted according to an arithmetic sequence. Referring to FIG. 6, the surface compensation values of the surface compensation points are sorted according to an arithmetic sequence, and the surface compensation values of the surface compensation points are sequentially 0.1mm, 0.08mm, 0.06mm, 0.04mm, 0.02mm and 0. Figure 2 In the surface reconstruction of a certain blade surface, the maximum surface compensation value is set to 0.1mm, and five surface compensation points are selected, and the surface compensation values of the five surface compensation points are sequentially 0.1mm, 0.08mm, 0.06mm, 0.04mm, 0.02mm and 0. Thus, the waviness of the blade surface can be effectively ensured to be within the qualified range.

[0039] In a possible implementation, the maximum surface compensation value among the surface compensation values of the surface compensation points is 1 / 2-2 / 3 of the height of the historical blade surface grinding knife mark, and the minimum surface compensation value is 0.

[0040] Specifically, the largest profile compensation value h in the profile compensation value of each profile compensation point has the largest relationship with the grinding material and the grinding intensity. The grinding intensity refers to the removal amount of the grinding surface when the belt 8 rotates one circle when the feed is 0. Generally speaking, the greater the hardness of the grinding material, the smaller the h value; the greater the grinding intensity, the smaller the removal amount. Considering that the two parameters of hardness and grinding intensity are not intuitive, in the embodiment, the h value is selected according to the height of the historical blade profile grinding tool joint step defect generated during normal grinding, and specifically, the h value is selected to be between 1 / 2 and 2 / 3 of the height of the historical blade profile grinding tool joint step defect, which is more appropriate, and can also be adjusted according to actual conditions.

[0041] In a possible implementation, when the profile 6 after the profile reconstruction is subjected to numerical control belt grinding and polishing, the method further includes: adjusting the included angle between the contact wheel generatrix of the contact wheel 4 of the numerical control belt and the profile tangent of the blade profile in the pressure reduction direction of the contact wheel 4 of the numerical control belt.

[0042] Optionally, the adjustment of the included angle between the contact wheel generatrix of the contact wheel 4 of the numerical control belt and the profile tangent of the blade profile in the pressure reduction direction of the contact wheel 4 of the numerical control belt includes:

[0043] The included angle between the contact wheel generatrix of the contact wheel 4 of the numerical control belt and the profile tangent of the blade profile is adjusted to 0.05°-0.5° in the pressure reduction direction of the contact wheel 4 of the numerical control belt.

[0044] Specifically, referring to Figure 4 When the belt 8 grinds, the included angle a between the contact wheel generatrix of the contact wheel 4 of the numerical control belt and the profile tangent of the blade profile is generally 180 degrees. When one end of the grinding profile is the profile inherent edge and the other end is the non-numerical control polishing profile, the a value can be adjusted appropriately, and the local adjustment value is generally between 0.05° and 0.5°, and the direction is the pressure reduction direction of the contact wheel 4 of the numerical control belt. Based on this, the lowest point passes through each point when the contact wheel 4 passes through the middle part of the grinding surface, so the grinding intensity has little effect. When the contact wheel 4 grinds to the blade profile grinding tool joint step defect prone position 7, the grinding intensity is reduced due to the inclination of the contact wheel 4, and the edge is lifted, thereby alleviating the step defect problem at the joint.

[0045] In a possible implementation, a conical structure is arranged on the target side of the contact wheel 4 of the numerical control belt; wherein the target side is the side of the contact wheel 4 of the numerical control belt close to the blade profile grinding tool joint step defect, and the diameter of the conical structure gradually decreases along the direction close to the blade profile grinding tool joint step defect.

[0046] Specifically, referring to Figure 5The numerical control abrasive belt comprises the abrasive belt 8 and the contact wheel 4, the contact wheel 4 is generally a right circular cylinder, and the abrasive belt 8 is tightly attached to the rotating surface for polishing by the contact wheel 4 during grinding.

[0047] To solve the stepped defects, the defects on one side can be trimmed, see Figure 6 The target side of the contact wheel 4 of the numerical control abrasive belt is structurally changed, the traditional cylindrical structure is broken through, the frustum structure is arranged on the target side of the contact wheel 4 of the numerical control abrasive belt, the grinding pressure of the target side can be reduced, and then the stepped defect problem of the numerical control polishing area 3 and the non-numerical control polishing area can be effectively solved.

[0048] Optionally, the length difference 2m between the minimum end diameter and the maximum end diameter of the frustum structure is 1 / 10 of the generatrix length of the contact wheel 4 of the numerical control abrasive belt.

[0049] In the blade profile grinding interface step defect optimization method, the blade profile grinding interface step defect optimization is realized from the following three aspects: profile reconstruction at the blade profile grinding interface step defect prone position 7, adjustment of the angle between the contact wheel generatrix of the contact wheel 4 of the numerical control abrasive belt and the profile tangent of the blade profile, and setting the frustum structure on the target side of the contact wheel 4 of the numerical control abrasive belt. According to the actual situation of the actual machining blade 1, one or several of the above three aspects can be used, and then the blade profile numerical control polishing and non-polishing area interface problem can be effectively solved. At present, the blade profile grinding interface step defect optimization method has been widely applied to actual production and processing, and has achieved certain results.

[0050] The above content is only for illustrating the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the present application.

Claims

1. A method of optimizing a step defect at a blade profile grinding land, characterized in that, The application relates to a method for grinding and polishing a blade surface by using a numerical control abrasive belt. The method comprises the following steps: arranging a plurality of surface compensation points at a step defect where a blade surface is ground and polished, fitting the plurality of surface compensation points to reconstruct a surface, and grinding and polishing the blade surface by using a numerical control abrasive belt according to the reconstructed surface. The height of the surface compensation point beyond the original grinding surface of the blade surface is defined as a surface compensation value of the surface compensation point, the surface compensation values of the surface compensation points are sequentially reduced along a pressure reduction direction of a contact wheel of the numerical control abrasive belt, and the surface compensation values of the surface compensation points are all not less than 0. A conical structure is arranged on a target side of the contact wheel of the numerical control abrasive belt; the target side is a side of the contact wheel of the numerical control abrasive belt close to the step defect where the blade surface is ground and polished, and the diameter of the conical structure is gradually reduced along the direction close to the step defect where the blade surface is ground and polished.

2. The method of optimizing the step defect at the blade profile grinding land break of claim 1, wherein, The length of the reconstructed surface is 1 / 20-1 / 40 of the generatrix length of the contact wheel of the numerical control abrasive belt.

3. The method of optimizing the step defect at the blade profile grinding land break of claim 1, wherein, The surface compensation values of the surface compensation points are sorted according to an arithmetic sequence.

4. The method of optimizing the step defect at the blade profile grinding land break of claim 1, wherein, The maximum surface compensation value among the surface compensation values of the surface compensation points is 1 / 2-2 / 3 of the height of the step defect where the blade surface is ground and polished, and the minimum surface compensation value is 0.

5. The method of optimizing the step defect at the blade profile grinding land break of claim 1, wherein, Five surface compensation points are arranged.

6. The method of optimizing the step defect at the blade profile grinding land break of claim 1, wherein, The method for grinding and polishing the blade surface according to the reconstructed surface further comprises the following steps: The angle between the generatrix of the contact wheel of the numerical control abrasive belt and the surface tangent of the blade surface is adjusted in the pressure reduction direction of the contact wheel of the numerical control abrasive belt.

7. The method of optimizing the step defect at the blade profile grinding land break of claim 6, wherein, The angle between the generatrix of the contact wheel of the numerical control abrasive belt and the surface tangent of the blade surface is adjusted in the pressure reduction direction of the contact wheel of the numerical control abrasive belt. The angle between the generatrix of the contact wheel of the numerical control abrasive belt and the surface tangent of the blade surface is adjusted in the pressure reduction direction of the contact wheel of the numerical control abrasive belt.

8. The method of optimizing the step defect at the blade profile grinding land break of claim 7, wherein, The length difference between the minimum end diameter and the maximum end diameter of the conical structure is 1 / 10 of the generatrix length of the contact wheel of the numerical control abrasive belt.

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