High-precision hole machining method for hydraulic shell

Abstract

The invention relates to a high-precision hole machining method for a hydraulic shell. The invention discloses a hydraulic shell high-precision hole machining method and relates to the technical field of hole machining methods. The high-precision hole machining method for the hydraulic shell comprises the steps that S1, rough machining is conducted, specifically, a part to be machined is punched, S2, a hole is honed through a honing tool; s3, checking is carried out; according to the method, a one-time punching and forming mode in the prior art is replaced by a mode of punching coarse holes first and then honing, so that the problems that positioning errors exist, the efficiency is low, long time is needed for tool debugging, and tool errors exist due to the fact that punching is carried out for several times are solved; the inner wall of a hole is subjected to rough honing in the process that a drill rod enters the hole, the inner wall of the hole is subjected to fine honing in the process that the drill rod extends out of the hole, the inner wall of the hole can be honed into the hole meeting the requirement of a finished product more quickly in the entering process, and the hole is subjected to final fine honing in the extending process; and a hole meeting the requirements of the cylindricity of 0.0035 mm and the smoothness of 0.4 mu m is rapidly formed.

Description

Technical Field

[0001] The invention belongs to the technical field of hole processing methods, and in particular relates to a high-precision hole processing method for a hydraulic housing. Background Art

[0002] As we all know, the heart of an airplane is the engine and the oil system parts are its "blood vessels". There are many plugging holes in the oil pressure system parts, and the engine has very high precision requirements and good sealing after assembly, so the finish and progress requirements of the holes are also improved accordingly.

[0003] However, there is no mature method for quickly processing such parts in the existing technology. Generally, the cycle is long, the processing is unstable, the defective rate is high, and it is difficult to complete the indicators within the required time.

[0004] Therefore, a high-precision hole machining method for a hydraulic housing is proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for high-precision hole machining of a hydraulic housing with a simple structure and reasonable design in order to solve the above problems, thereby solving the problem that there is no fast machining method for high-precision holes in the prior art.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A method for machining a high-precision hole of a hydraulic housing comprises the following steps: S1: Rough machining, drilling holes on the parts to be machined, the diameter of the holes is 1.0 mm smaller than the required diameter; S2: Use a honing tool to hone the hole so that the cylindricity of the hole reaches 0.0035mm and the smoothness reaches 0.4um; S3: Inspection: Use a surface roughness profiler and a cylindricity tester to inspect the finish and cylindricity of the hole respectively. After passing the inspection, the finished parts are formed; The honing tool comprises a drill rod and a connecting rod, wherein the connecting rod is used to connect the main shaft of the honing device, and the drill rod is integrally connected with the connecting rod. When the main shaft of the honing device drives the connecting rod to rotate or reciprocate linearly, the drill rod rotates or reciprocates linearly synchronously with the connecting rod. The outer surface of the drill rod has a textured surface.

[0007] As a further optimization solution of the present invention, the textured surface includes a coarse textured surface and a fine textured surface, the coarse textured surface and the fine textured surface are arranged in sequence, and the coarse textured surface is located at a section of the drill rod close to the connecting rod; When the drill rod moves into the hole, the coarse mesh surface is used to perform coarse honing on the hole. When the drill rod moves out of the hole, the fine mesh surface is used to perform fine honing on the hole.

[0008] As a further optimization scheme of the present invention, the outer surface of the drill rod is provided with a dust removal groove, the dust removal groove is distributed in a threaded shape, and both ends of the dust removal groove respectively penetrate the end faces of both ends of the drill rod.

[0009] As a further optimization scheme of the present invention, the inner walls on both sides of the dust removal groove are inclined surfaces, and an obtuse angle ɑ is formed between the inclined surface and the bottom of the dust removal groove. An obtuse angle structure portion having an obtuse angle structure is formed at one end of the inclined surface close to the opening of the dust removal groove.

[0010] As a further optimization solution of the present invention, both ends of the drill rod have guide ends.

[0011] As a further optimization solution of the present invention, the guide end is a conical structure, and the diameter of one end of the conical structure close to the middle of the drill rod is larger than the diameter of the other end of the cylindrical structure.

[0012] As a further optimization solution of the present invention, the part to be processed is a hydraulic housing.

[0013] As a further optimization solution of the present invention, the hole has multiple sections, the holes arranged in the multiple sections are interconnected, and the holes arranged in the multiple sections have different thicknesses.

[0014] As a further optimization scheme of the present invention, the parts to be processed are fixed with a fixture and then punched and honed in sequence.

[0015] The beneficial effect of the present invention is that the method of first drilling a rough hole and then honing it replaces the one-time drilling and forming method in the prior art, solving the problem that drilling holes in batches not only has positioning errors but also has low efficiency, requires a long time to debug the tool, and has tool errors.

[0016] In the present invention, the inner wall of the hole is roughly honed during the process of the drill rod entering the hole, and the inner wall of the hole is finely honed during the process of the drill rod extending out of the hole. During the entry process, the inner wall of the hole can be honed more quickly to a hole close to the requirements of the finished product, and during the extension process, the hole is finally finely honed to quickly form a hole that meets the requirements of cylindricity 0.0035mm and smoothness 0.4um.

[0017] When the inner wall of the hole is honed during the process of the drill rod entering and exiting the hole, the dust generated by the honing can be discharged along the dust removal grooves distributed in a threaded shape without remaining in the hole, thereby improving the processing accuracy and avoiding the phenomenon of excessive wear of the inner wall of the hole due to residual dust.

[0018] In the present invention, the dust removal grooves are distributed in a spiral shape, which reduces the phenomenon that the groove edges of the dust removal grooves scrape the inner wall of the hole, and reduces the problem of reducing the honing accuracy of the inner wall of the hole due to the provision of the dust removal grooves.

[0019] In the present invention, the inner walls on both sides of the dust removal groove are both inclined surfaces, and an obtuse angle ɑ is formed between the inclined surface and the bottom of the dust removal groove. An obtuse angle structure portion having an obtuse angle structure is formed at one end of the inclined surface close to the opening of the dust removal groove. When the drill rod rotates, it contacts the inner wall of the hole through the obtuse angle structure portion, thereby reducing damage to the inner wall of the hole. Therefore, the setting of the dust removal groove ensures that dust can be discharged in time during the honing process, and further damage to the inner wall of the hole is avoided. In addition, dust is not easy to remain inside the dust removal groove when it is discharged along the distribution trajectory in the dust removal groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of the method for high-precision hole machining of a hydraulic housing of the present invention; Figure 2 It is a schematic diagram of the hydraulic housing structure of the present invention; Figure 3 is a schematic diagram of the structure of a honing tool in Embodiment 1 of the present invention; Figure 4 is a schematic diagram of the structure of a honing tool in Embodiment 2 of the present invention; Figure 5 is a schematic diagram of the structure of a honing tool in Embodiment 3 of the present invention; Figure 6 The present invention Figure 5 Radial cross section of the medium honing tool; Figure 7 The present invention Figure 6 A schematic diagram of the enlarged structure in the middle.

[0021] In the figure: drill rod 1, coarse mesh surface 10, fine mesh surface 11, guide end 2, connecting rod 3, dust removal groove 4, inclined surface 5, obtuse angle structure part 6. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] As we all know, the heart of an airplane is the engine and the oil system parts are its "blood vessels". There are many plugging holes in the oil pressure system parts, and the engine has very high precision requirements and good sealing after assembly, so the finish and progress requirements of the holes are also improved accordingly.

[0024] However, there is no mature method for quickly processing such parts in the existing technology. Generally, the cycle is long, the processing is unstable, the defective rate is high, and it is difficult to complete the indicators within the required time.

[0025] There is currently very little experience available for machining deep holes in parts with high-precision functional holes, but such parts are rigidly needed in aircraft control. Therefore, a method for machining high-precision holes in hydraulic housings is provided, and the machined parts are used in aviation hydraulic systems, which will help upgrade the technology in aircraft engines, control systems, and oil system parts.

[0026] Reference Figure 1 As shown, the high-precision hole machining method for the hydraulic housing mainly includes three steps: Step 1: Rough machining, drilling holes on the parts to be machined, the diameter of the holes is 1.0mm smaller than the required diameter; Step 2: Use a honing tool to hone the hole so that the cylindricity of the hole reaches 0.0035mm and the smoothness reaches 0.4um; The third step: inspection, use a surface roughness profiler, cylindricity tester or other corresponding equipment to inspect the smoothness and cylindricity of the hole respectively, and form finished parts after passing the inspection.

[0027] Finished parts as attached Figure 2 As shown in the figure, the finished part (hydraulic housing) has a transversely penetrating functional hole, which is composed of multiple sections of transverse holes of different thicknesses connected to each other. Therefore, if you want to process a high-precision hole in one go, there are the following problems: First, the hole depth is very deep, and the hole requirements are very high. The hole diameter tolerance is 0.032mm, the cylindricity is 0.0035mm, and the smoothness requirement is 0.4um. To process the deep hole, it must be processed from both sides of the hole twice. There is a repeated positioning error here, which places high requirements on the machine tool. Secondly, the traditional processing method cannot meet the cylindricity of 0.0035mm and the smoothness requirement of 0.4um, and it takes a very long time to debug the tool, and there are also tool errors. Finally, the traditional processing method takes too long and cannot meet the specified delivery date. Therefore, the traditional processing method is a great challenge to efficiency, cost, and yield rate. To overcome this problem, it is particularly important to propose a high-precision hole processing method for hydraulic housings.

[0028] In the present invention, firstly, a hole is punched on the part to be processed through rough machining. The diameter of the hole can be about 1.0 mm smaller than the required diameter, and it does not need to be particularly precise. Therefore, the punching efficiency will be improved, and there is no need to worry about the problem of the hole diameter being too large, thereby improving the speed of the initial punching.

[0029] Secondly, the hole is polished by a honing tool developed by the self-developed honing tool, and the honing tool is installed on the main shaft of the honing equipment, so that the honing tool rotates, and the honing tool is inserted into the hole to polish the hole, replacing the one-time punching and forming method in the prior art. As is known to all, honing only requires the rotation of the honing tool, the power used is small, the vibration force generated is relatively small, and the accuracy is easy to control. Drilling not only requires driving the drill bit to rotate, but also requires overcoming the resistance of the parts to be processed. The power used is large, the vibration force generated is relatively large, the accuracy is not easy to control, and the drill bit drilling accuracy is low. The use of honing can produce more precise holes. Therefore, the method of first drilling a rough hole and then honing in the present invention replaces the one-time punching and forming method in the prior art, solving the problem that the need for drilling holes in batches not only has positioning errors but also has low efficiency, a long time is required to debug the tool, and there are tool errors.

[0030] The honing tools developed by the present invention include three types: The first type: Refer to the attached Figure 3 As shown in the figure, the honing tool includes a drill rod 1, a guide end 2 and a connecting rod 3. The drill rod 1 and the connecting rod 3 are integrally connected or detachably connected. The connecting rod 3 is used to connect to the main shaft of the honing equipment. When the main shaft of the honing equipment rotates, the connecting rod 3 and the drill rod 1 can be driven to rotate at high speed, and the drill rod 1 is extended into the hole with the processed part, so as to hone the hole and process the hole that meets the requirements of cylindricity 0.0035mm and smoothness 0.4um.

[0031] Both ends of the drill rod 1 have guide ends 2, and the guide ends 2 are conical structures. The diameter of one end of the conical structure close to the middle of the drill rod 1 is larger than the diameter of the other end of the cylindrical structure. The setting of the guide ends 2 can make the drill rod 1 better extend into the hole and play a guiding role.

[0032] Furthermore, the outer surface of the drill rod 1 has a reticulated surface. During the honing process, the main shaft of the honing equipment drives the drill rod 1 to rotate while making linear reciprocating motion. Under a certain outward expansion pressure, the reticulated surface on the drill rod 1 removes grinding chips on the inner wall surface of the hole and grinds out spiral cross-reticulated wear marks.

[0033] It should be noted that when drilling holes in the parts to be processed, the parts to be processed need to be fixed on the fixture. The fixture is set according to the shape of the parts to be processed. The parts to be processed can be fixed on the fixture by screws or clamping. This is a routine adjustment that can be made by technical personnel in this field and will not be elaborated here.

[0034] In Example 2, refer to the attached Figure 4As shown in , the textured surface includes a coarse textured surface 10 and a fine textured surface 11, which are arranged in sequence. The coarse textured surface 10 is located on a section of the drill rod 1 close to the connecting rod 3. When the drill rod 1 moves into the hole, the coarse textured surface 10 is used to roughly hone the hole. When the drill rod 1 moves out of the hole, the fine textured surface 11 is used to finely hone the hole. Finally, a hole that meets the requirements of cylindricity 0.0035mm and smoothness 0.4um is quickly formed. In the present invention, the inner wall of the hole is roughly honed during the process of the drill rod 1 entering the hole, and the inner wall of the hole is finely honed during the process of the drill rod 1 extending out of the hole. During the entry process, the inner wall of the hole can be honed more quickly to a hole close to the requirements of the finished product, and during the extension process, the hole is finally finely honed to quickly form a hole that meets the requirements of cylindricity 0.0035mm and smoothness 0.4um.

[0035] It should be noted that the devices for controlling the rotation and reciprocation of the drill rod 1 are all mature technologies on existing honing equipment. The main shaft on the honing equipment can both rotate and reciprocate, which will not be described in detail here.

[0036] In Example 3, refer to Figure 5 As shown in FIG. 1 , a dust removal groove 4 is provided on the outer surface of the drill rod 1 . The dust removal groove 4 is distributed in a threaded shape, and both ends of the dust removal groove 4 penetrate the end surfaces of both ends of the drill rod 1 respectively.

[0037] When the inner wall of the hole is honed during the process of the drill rod 1 entering and exiting the hole, the dust generated by the honing can be discharged along the threaded dust removal groove 4 without remaining in the hole, thereby improving the processing accuracy and avoiding excessive wear of the inner wall of the hole due to residual dust.

[0038] Moreover, the dust removal grooves 4 are distributed in a spiral shape, which reduces the phenomenon that the groove edges of the dust removal grooves 4 scrape against the inner wall of the hole, and reduces the problem of reducing the honing accuracy of the inner wall of the hole due to the provision of the dust removal grooves 4.

[0039] Reference Figure 6 To Attachment Figure 7 As shown in the figure, further, the inner walls on both sides of the dust removal groove 4 are inclined surfaces 5, and an obtuse angle α is formed between the inclined surface 5 and the bottom of the dust removal groove 4. An obtuse angle structure part 6 with an obtuse angle structure is formed at one end of the inclined surface 5 close to the opening of the dust removal groove 4. When the drill rod 1 rotates, it contacts the inner wall of the hole through the obtuse angle structure part 6, reducing damage to the inner wall of the hole. Therefore, the setting of the dust removal groove 4 ensures that dust can be discharged in time during the honing process, and further damage to the inner wall of the hole is avoided.

[0040] Furthermore, α is also an obtuse angle, so that the dust is not likely to remain inside the dust removal chute 4 when being discharged along the distribution trajectory in the dust removal chute 4 .

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-precision hole machining method for a hydraulic housing, characterized in that: The following steps are involved: S1: Rough machining, drilling holes on the parts to be machined, the diameter of the holes is 1.0 mm smaller than the required diameter; S2: Use a honing tool to hone the hole so that the cylindricity of the hole reaches 0.0035mm and the smoothness reaches 0.4um; S3: Inspection: Use a surface roughness profiler and a cylindricity tester to inspect the finish and cylindricity of the hole respectively. After passing the inspection, the finished parts are formed; The honing tool comprises a drill rod (1) and a connecting rod (3); the connecting rod (3) is used to connect to the main shaft of the honing device; the drill rod (1) and the connecting rod (3) are integrally connected; when the main shaft of the honing device drives the connecting rod (3) to rotate or move linearly back and forth, the drill rod (1) rotates or moves linearly back and forth synchronously with the connecting rod (3); The outer surface of the drill rod (1) has a textured surface.

2. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: The textured surface comprises a coarse textured surface (10) and a fine textured surface (11), the coarse textured surface (10) and the fine textured surface (11) being arranged in sequence, and the coarse textured surface (10) is located at a section of the drill rod (1) close to the connecting rod (3); When the drill rod (1) moves into the hole, the coarse mesh surface (10) is used to perform coarse honing on the hole, and when the drill rod (1) moves out of the hole, the fine mesh surface (11) is used to perform fine honing on the hole.

3. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: The outer surface of the drill rod (1) is provided with a dust removal groove (4), the dust removal groove (4) is distributed in a threaded shape, and both ends of the dust removal groove (4) respectively penetrate the end surfaces of both ends of the drill rod (1).

4. The method for high-precision hole machining of a hydraulic housing according to claim 3, characterized in that: The inner walls on both sides of the dust removal groove (4) are inclined surfaces (5), an obtuse angle ɑ is formed between the inclined surfaces (5) and the bottom of the dust removal groove (4), and an obtuse angle structure portion (6) having an obtuse angle structure is formed at one end of the inclined surface (5) close to the opening of the dust removal groove (4).

5. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: Both ends of the drill rod (1) are provided with guide ends (2).

6. The method for high-precision hole machining of a hydraulic housing according to claim 5, characterized in that: The guide end (2) is a conical structure, and the diameter of one end of the conical structure close to the middle of the drill rod (1) is larger than the diameter of the other end of the cylindrical structure.

7. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: The part to be processed is a hydraulic housing.

8. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: The holes have multiple sections, the holes arranged in the multiple sections are interconnected, and the holes arranged in the multiple sections have different thicknesses.

9. The method for high-precision hole machining of a hydraulic housing according to claim 1, characterized in that: The parts to be processed are fixed by a fixture and then punched and honed in sequence.

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