A processing method for a double-end centering fixture of a shaft sleeve

Abstract

A processing method for a double-end centering fixture of a sleeve, the processing method comprising: step 1, providing a cylindrical blank, and cutting the cylindrical blank from the middle to form a fixed block (22) and a docking block (23); step 2, providing another cylindrical blank, and processing it to form a fixed boss (21); step 3, welding the fixed block to the end face of the fixed boss (21), and then connecting the docking block (23) to the fixed block (22), and then clamping the fixed boss (21) on a machine tool, and then processing an annular positioning convex ridge (25) between the fixed block (22) and the docking block (23). The present invention uses two cylindrical blanks as the main body for processing, and after the fixed boss is processed, it is welded to the fixed block, and then the fixed block and the docking block are connected and then the positioning convex ridge is processed between the two at the same time, so that the positioning convex ridge can be ensured to have high positioning accuracy and be less affected by assembly and tool wear.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a double-end centering fixture for a shaft sleeve. Background Art

[0002] like Figure 1-3 As shown, the double-end equal-diameter sleeve (including the tapered end 11, the toothed end 12, the equal-diameter section 13, and the necking section 14) used in the aircraft engine, the equal-diameter section 13 and the necking section 14 must be processed and the processing accuracy is very high, so as to ensure the accuracy after installation. The processing procedure for the double-end equal-diameter sleeve is to first process the equal-diameter section 13 of the equal-diameter sleeve, then fix the outer cylindrical tube section of the double-end equal-diameter sleeve through a clamp, process one end (such as the tapered end 11), then remove the double-end equal-diameter sleeve from the clamp, turn the direction and fix it on the clamp again, and then process the other end (such as the toothed end 12). Since the concentricity deviation is easily caused during the two clamping processes of the clamp, and the double-end equal-diameter sleeve has a certain length, it is also easy for the conventional clamp to tilt slightly when it is clamped, so it is difficult for the conventional centering clamp to ensure the processing accuracy requirements. For this reason, the applicant proposed a double-end centering clamp for the sleeve.

[0003] The applicant has also designed a processing method for the double-end centering fixture of the sleeve, which can improve the structural strength of the double-end centering fixture of the sleeve and make the processing more convenient. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for processing a double-end centering fixture of a shaft sleeve, which can make the processing of the double-end centering fixture of the shaft sleeve more convenient and have better structural strength.

[0005] In order to solve the above technical problems, the present invention provides a processing method of a double-end centering fixture for a sleeve, wherein the double-end centering fixture for a sleeve is used to fix a double-end equal-diameter sleeve, and comprises a circular fixing boss, a semicircular fixing block and a semicircular docking block, wherein the fixing block is fixedly connected to the fixing boss, and the docking block is detachably connected to the fixing block to form a hollow cylindrical structure; a receiving cavity with a larger inner diameter is formed at one end of the cylinder close to the fixing boss, and a positioning annular positioning convex ridge is respectively provided on the inner wall of the cylinder close to the two ends of the cylinder, the inner diameters of the two positioning convex ridges are equal to the outer diameters of the double-end equal-diameter sleeves, and the two positioning convex ridges are coaxially arranged with the fixing boss;

[0006] The processing method includes:

[0007] Step 1: provide a cylindrical blank, and cut the cylindrical blank from the middle to form a fixing block and a docking block;

[0008] Step 2: provide another cylindrical blank and process it to form a fixed boss;

[0009] Step three, weld the fixing block to the end face of the fixing boss, connect the docking block to the fixing block, clamp the fixing boss on the machine tool, and then process the annular positioning ridge between the fixing block and the docking block.

[0010] The accommodating cavity is located in the end surface after the fixing block and the docking block are docked.

[0011] Correspondingly, step one also includes pre-machining an accommodating cavity on the end surface before cutting to form the fixing block and the docking block.

[0012] After the accommodating cavity is formed by machining, a prefabricated through hole is machined in the center of the cylindrical blank, and the inner diameter of the prefabricated through hole is smaller than the inner diameter of the positioning convex ridge.

[0013] Correspondingly, in step 2, a truncated cone is machined on one end face of the cylindrical blank, and a flat surface is milled on the other end face to facilitate welding with the fixing block.

[0014] Correspondingly, in step three, before machining the positioning ribs, enlarging holes is performed on the outer sides and the middle of the two positioning ribs, and the inner diameter after enlarging is larger than the inner diameter of the positioning ribs;

[0015] The same turning tool is used to repeatedly perform rough machining and fine machining on the two positioning ridges; that is, the rough machining of the two positioning ridges is completed by one cut during the first feed machining, and the fine machining of the two positioning ridges is completed by one cut during the second feed machining, thereby minimizing the error caused by tool wear during the machining of the two positioning ridges.

[0016] The accommodating cavity is located in the end surface of the fixing boss.

[0017] Correspondingly, step one also includes machining a prefabricated through hole at the center of the cylindrical blank before cutting to form the fixing block and the docking block, wherein the inner diameter of the prefabricated through hole is smaller than the inner diameter of the positioning ridge.

[0018] Correspondingly, in step 2, a truncated cone is machined on one end face of the cylindrical blank, and a flat surface is milled on the other end face to facilitate welding with the fixing block; and then a receiving cavity is machined in the other end face.

[0019] Correspondingly, in step three, before machining the positioning ribs, enlarging holes is performed on the outer sides and the middle of the two positioning ribs, and the inner diameter after enlarging is larger than the inner diameter of the positioning ribs;

[0020] The same turning tool is used to repeatedly perform rough machining and fine machining on the two positioning ridges; that is, the rough machining of the two positioning ridges is completed by one cut during the first feed machining, and the fine machining of the two positioning ridges is completed by one cut during the second feed machining, thereby minimizing the error caused by tool wear during the machining of the two positioning ridges.

[0021] The distance between the positioning ridges is less than the length of the equal diameter section of the double-ended equal diameter sleeve, but greater than half of the sum of the lengths of the equal diameter section and the necking section of the double-ended equal diameter sleeve.

[0022] The length of the cylinder is shorter than the length of the double-ended equal-diameter sleeve.

[0023] The fixing block and the docking block are made of the same material and size.

[0024] The docking block and the fixing block are connected via a plurality of connecting bolts, and correspondingly, bolt holes are processed on the docking block and the fixing block respectively.

[0025] The distance between the inner positioning ridge and the accommodating cavity, and the distance between the outer positioning ridge and the outer end of the cylinder are both greater than the length of the necking section of the double-end equal-diameter sleeve.

[0026] The size of the accommodating cavity is larger than the size of the conical end and the toothed end of the double-ended equal-diameter sleeve, that is, the diameter and width of the accommodating cavity are larger than the diameter and width of the conical end and the toothed end.

[0027] The fixing block is fixedly connected to the fixing boss by welding.

[0028] The outer diameter of the docking block after docking with the fixing block is equal to the outer diameter of the fixing boss.

[0029] The processing method of the double-end centering fixture of the sleeve provided by the present invention uses two cylindrical blanks as the main body for processing, and after the fixing boss is processed, it is welded to the fixing block, and then the fixing block and the docking block are connected and then the positioning ridge is processed between the two at the same time, thereby ensuring that the positioning ridge has high positioning accuracy and is less affected by assembly and tool wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a double-ended equal-diameter sleeve.

[0031] Figure 2 It is a schematic diagram of the right side structure of a double-ended equal-diameter sleeve.

[0032] Figure 3 It is a left view structural diagram of a double-ended equal-diameter sleeve.

[0033] Figure 4 It is a schematic structural diagram of the double-end centering fixture of the sleeve according to an embodiment of the present invention.

[0034] Figure 5 It is a schematic cross-sectional view of the double-end centering fixture for a sleeve according to an embodiment of the present invention.

[0035] Figure 6It is a left-side structural schematic diagram of the double-end centering fixture for a sleeve according to an embodiment of the present invention.

[0036] Figure 7 It is a schematic cross-sectional view of the double-end centering fixture for a sleeve according to an embodiment of the present invention.

[0037] Figure 8 The figure is a schematic diagram of the assembly structure of the double-end centering fixture of the sleeve according to the embodiment of the present invention.

[0038] Fig. 9 The figure is a schematic diagram of the assembly structure of the double-end centering fixture of the sleeve according to the embodiment of the present invention.

[0039] Fig.10 This is a schematic diagram of the use status of the double-end centering fixture of the sleeve described in an embodiment of the present invention.

[0040] Fig.11 This is a schematic diagram of step 1 of the processing method described in an embodiment of the present invention.

[0041] Fig.12 This is a schematic diagram of step 2 of the processing method described in an embodiment of the present invention.

[0042] Fig.13 This is a schematic diagram of step three of the processing method described in an embodiment of the present invention.

[0043] Fig.14 This is a schematic diagram of step 1 of the processing method described in an embodiment of the present invention.

[0044] Fig.15 This is a schematic diagram of step 2 of the processing method described in an embodiment of the present invention.

[0045] Fig.16 This is a schematic diagram of step three of the processing method described in an embodiment of the present invention.

[0046] In the figure:

[0047] 1-double-end equal-diameter sleeve; 11-conical end; 12-toothed end; 13-equal-diameter section; 14-neck section;

[0048] 2- double-end centering fixture of the sleeve; 21- fixing boss; 22- fixing block; 23- docking block; 24- accommodating cavity; 25- positioning convex ridge; 26- bolt hole. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] like Figure 4-10 As shown, the present invention provides a double-end centering fixture for a sleeve, which is used to fix Figure 1-3 The double-ended equal-diameter shaft sleeve 1 shown comprises a circular fixed boss 21, a semicircular fixed block 22 and a semicircular docking block 23, wherein the fixed boss 21 is used to be fixed at the clamping station of the machine tool, and the end of the fixed boss 21 is truncated; the fixed block 22 is fixedly connected to the fixed boss 21, and the docking block 23 is detachably connected to the fixed block 22 to form a hollow cylindrical structure; a receiving cavity 24 with a larger inner diameter is formed at one end of the cylinder close to the fixed boss 21; when the double-ended equal-diameter shaft sleeve 1 is clamped, the receiving cavity 24 is used to accommodate the conical end 11 and the toothed end 12 of the double-ended equal-diameter shaft sleeve 1; a positioning annular positioning rib 25 is respectively provided on the inner wall of the cylinder close to the two ends of the cylinder, and the inner diameters of the two positioning ribs 25 are equal to the outer diameter of the double-ended equal-diameter shaft sleeve 1, specifically the outer diameter of the equal-diameter section 13, and the two positioning ribs 25 are coaxially arranged with the fixed boss 21.

[0053] The double-end centering fixture of the sleeve provided by the present invention forms a cylindrical structure for accommodating the double-end equal-diameter sleeve by docking the docking block and the fixed block, and two positioning ridges are provided on the inner wall of the cylinder to position the equal-diameter section of the double-end equal-diameter sleeve from two positions. When the double-end equal-diameter sleeve is reversed, the concentricity of the two clampings can be guaranteed, thereby further ensuring the processing accuracy.

[0054] The distance between the positioning ridges 25 is less than the length of the equal-diameter section 13 of the double-end equal-diameter sleeve 1, but greater than half of the sum of the lengths of the equal-diameter section 13 and the necking section 14 of the double-end equal-diameter sleeve 1, thereby ensuring that a sufficient distance is retained between the two positioning ridges 25 to provide positioning support for the double-end equal-diameter sleeve 1.

[0055] The length of the cylinder is smaller than that of the double-ended equal-diameter sleeve 1 , so that the double-ended equal-diameter sleeve 1 can be placed in the cylinder with one end of the double-ended equal-diameter sleeve 1 exposed.

[0056] The fixed block 22 and the docking block 23 are made of the same material and size, so that the fixed block 22 and the docking block 23 have the same weight. In this way, after the docking block 23 is connected to the fixed block 22, the two are symmetrical relative to the center, so that the moment of inertia on both sides is the same, and there is no need to set a counterweight block to ensure the rotation stability of the entire centering clamp.

[0057] like Figure 7 As shown, the docking block 23 is connected to the fixing block 22 via a plurality of connecting bolts, and correspondingly, bolt holes 26 are processed on the docking block 23 and the fixing block 22 respectively.

[0058] The distance between the inner positioning ridge 25 and the accommodating cavity 24 and the distance between the outer positioning ridge 25 and the outer end of the cylinder are both greater than the length of the necking section 14 of the double-end equal-diameter sleeve 1 .

[0059] The size of the accommodating cavity 24 is larger than the size of the conical end 11 and the toothed end 12 of the double-ended equal-diameter sleeve, that is, the diameter and width of the accommodating cavity 24 are larger than the diameter and width of the conical end 11 and the toothed end 12 .

[0060] The fixing block 22 and the fixing boss 21 are fixedly connected by welding. The welding method makes the structure of the two stable after being connected, and they can be processed and manufactured separately before being connected.

[0061] The outer diameter of the docking block 23 after docking with the fixing block 22 is equal to the outer diameter of the fixing boss 21 , so that the entire centering fixture has a uniform outer shape.

[0062] like Figure 11-16 As shown, the embodiment of the present invention also provides a method for processing a double-end centering fixture of a sleeve, comprising:

[0063] Step 1, providing a cylindrical blank, and cutting the cylindrical blank from the middle to form a fixed block 22 and a docking block 23; cutting the same cylindrical blank into equally divided fixed blocks 22 and docking blocks 23 can ensure that the materials, sizes, and weights of the two are the same, so that they have the same moment of inertia during the rotation process;

[0064] Step 2: Provide another cylindrical blank and process it to form a fixed boss 21. The fixed boss 21 has a truncated cone structure and is used to be mounted on a machine tool to facilitate positioning and fixing of the entire centering fixture.

[0065] Step 3: Weld the fixing block 22 to the end face of the fixing boss 21, connect the docking block 23 to the fixing block 22, and then clamp the fixing boss 21 on the machine tool, and then process the annular positioning ridge 25 between the fixing block 22 and the docking block 23. The docking block 23 is connected to the fixing block 22 in a detachable manner. At this time, it is usually necessary to process bolt holes on the fixing block 22 and the docking block 23 respectively, and fasten them with bolts.

[0066] The processing method of the double-end centering fixture of the sleeve provided by the present invention uses two cylindrical blanks as the main body for processing, and after the fixed boss 21 is processed, it is welded to the fixed block 22, and then the fixed block 22 and the docking block 23 are connected and then the positioning rib 25 is processed between the two at the same time, thereby ensuring that the positioning rib 25 has high positioning accuracy and is less affected by assembly and tool wear.

[0067] Furthermore, if Figure 11-13 As shown, the accommodating cavity is located in the end surface after the fixing block 22 and the docking block 23 are docked.

[0068] Correspondingly, step 1 also includes pre-machining a receiving cavity on the end surface of the cylindrical blank before cutting to form the fixing block 22 and the docking block 23. The size of the receiving cavity is the same as the size of the receiving cavity after forming.

[0069] After the receiving cavity is formed, a prefabricated through hole is processed in the center of the cylindrical blank, and the inner diameter of the prefabricated through hole is smaller than the inner diameter of the positioning rib 25. The inner diameter of the prefabricated through hole is sized to facilitate the tool of the machine tool to expand the prefabricated through hole. Generally, the inner diameter of the prefabricated through hole should be slightly smaller than the inner diameter of the positioning rib 25, for example, 2 mm smaller than the inner diameter of the positioning rib 25.

[0070] Correspondingly, in step 2, a truncated cone is machined on one end face of the cylindrical blank, and a flat surface is milled on the other end face to facilitate welding with the fixing block 22 .

[0071] Correspondingly, in step three, before processing the positioning ribs 25, hole expansion processing is performed on the outside and the middle of the two positioning ribs 25 respectively, and the inner diameter after expansion is larger than the inner diameter of the positioning ribs 25; through the hole expansion process, unnecessary excess blanks can be cut off in advance, and the workload of processing the positioning ribs 25 is greatly reduced.

[0072] The same turning tool is used to repeatedly perform rough machining and fine machining on the two positioning ridges 25; that is, the rough machining of the two positioning ridges 25 is completed by one cut during the first feed machining, and the fine machining of the two positioning ridges 25 is completed by one cut during the second feed machining, thereby minimizing the error caused by tool wear during the machining of the two positioning ridges 25.

[0073] like Figure 14-16 As shown, the accommodating cavity is located in the end surface of the fixing boss 21.

[0074] Correspondingly, step one also includes machining a prefabricated through hole at the center of the cylindrical blank before cutting to form the fixing block 22 and the docking block 23 , wherein the inner diameter of the prefabricated through hole is smaller than the inner diameter of the positioning ridge 25 .

[0075] Corresponding to step two, a frustum is machined on one end face of the cylindrical blank, and a plane is milled on the other end face to facilitate welding with the fixed block 22; then a receiving cavity is machined in the other end face, and the receiving cavity is set on the positioning boss. This can reduce the process steps for machining the fixed block 22 and the positioning block, and can make full use of the space on the fixed boss 21, thereby reducing the size of the entire centering fixture.

[0076] Correspondingly, in step three, before machining the positioning ribs 25, the outer sides and the middle of the two positioning ribs 25 are expanded, and the inner diameter after expansion is larger than the inner diameter of the positioning ribs 25;

[0077] The same turning tool is used to repeatedly perform rough machining and fine machining on the two positioning ridges 25; that is, the rough machining of the two positioning ridges 25 is completed by one cut during the first feed machining, and the fine machining of the two positioning ridges 25 is completed by one cut during the second feed machining, thereby minimizing the error caused by tool wear during the machining of the two positioning ridges 25.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. 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, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for processing a double-end centering fixture for a sleeve, the double-end centering fixture for a sleeve being used to fix a double-end equal-diameter sleeve (1), comprising a circular fixing boss (21), a semicircular fixing block (22) and a semicircular docking block (23), characterized in that: in, The fixing block (22) is fixedly connected to the fixing boss (21), and the docking block (23) is detachably connected to the fixing block (22) to form a hollow cylindrical structure; a receiving cavity (24) with a larger inner diameter is formed at one end of the cylinder close to the fixing boss (21), and a positioning annular positioning ridge (25) is provided on the inner wall of the cylinder close to both ends of the cylinder, respectively; the inner diameters of the two positioning ridges (25) are both equal to the outer diameter of the double-end equal-diameter shaft sleeve (1), and the two positioning ridges (25) are coaxially arranged with the fixing boss (21); The processing method includes: Step 1, providing a cylindrical blank, pre-machining a receiving cavity (24) on the end surface, and then machining a pre-made through hole in the center of the cylindrical blank, wherein the inner diameter of the pre-made through hole is smaller than the inner diameter of the positioning ridge (25), and the cylindrical blank is cut from the middle to form a fixing block (22) and a docking block (23); Step 2: provide another cylindrical blank and process it to form a fixed boss (21); Step 3, welding the fixing block to the end surface of the fixing boss (21), then connecting the docking block (23) to the fixing block (22), then clamping the fixing boss (21) on the machine tool, and then processing an annular positioning ridge (25) between the fixing block (22) and the docking block (23), before processing the positioning ridge (25), respectively expanding the outer side and the middle of the two positioning ridges (25), and the inner diameter after the expansion is larger than the inner diameter of the positioning ridge (25); Repeatedly roughing and finishing the two positioning convex ridges with the same turning tool; that is, the roughing of the two positioning convex ridges (25) is completed in one cut during the first cutting process, and the finishing of the two positioning convex ridges (25) is completed in one cut during the second cutting process, thereby minimizing the error caused by tool wear during the processing of the two positioning convex ridges (25); The distance between the positioning ridges (25) is less than the length of the equal-diameter section (13) of the double-end equal-diameter shaft sleeve (1), but greater than half the sum of the lengths of the equal-diameter section (13) and the necking section (14) of the double-end equal-diameter shaft sleeve (1); the distance between the positioning ridges (25) located on the inner side and the accommodating cavity (24), and the distance between the positioning ridges (25) located on the outer side and the outer end of the cylinder, are both greater than the length of the necking section (14) of the double-end equal-diameter shaft sleeve (1).

2. The processing method according to claim 1, characterized in that: The accommodating cavity (24) is located inside the end surface of the fixed block (22) and the docking block (23) after they are docked.

3. The processing method according to claim 2, characterized in that: Correspondingly, in step 2, a truncated cone is machined on one end face of the cylindrical blank, and a flat surface is milled on the other end face to facilitate welding with the fixing block.

4. The processing method according to claim 1, characterized in that: The accommodating cavity is located in the end surface of the fixed boss (21); Correspondingly, step one also includes machining a prefabricated through hole at the center of the cylindrical blank before cutting to form the fixing block (22) and the docking block (23), wherein the inner diameter of the prefabricated through hole is smaller than the inner diameter of the positioning ridge (25).

5. The processing method according to claim 4, characterized in that: Correspondingly, in step 2, a truncated cone is machined on one end face of the cylindrical blank, and a flat surface is milled on the other end face to facilitate welding with the fixing block; and then a receiving cavity (24) is machined in the other end face.

6. The processing method according to claim 5, characterized in that: Correspondingly, in step three, before machining the positioning ribs (25), hole enlargement is performed on the outer sides and the middle of the two positioning ribs (25), and the inner diameter after enlargement is larger than the inner diameter of the positioning ribs (25); The same turning tool is used to repeatedly perform rough machining and fine machining on the two positioning convex ridges (25); that is, the rough machining of the two positioning convex ridges (25) is completed in one cut during the first cut, and the fine machining of the two positioning convex ridges (25) is completed in one cut during the second cut, so that the error caused by tool wear is minimized during the machining of the two positioning convex ridges (25).

7. The processing method according to claim 1, characterized in that: The length of the cylinder is smaller than the length of the double-ended equal-diameter sleeve (1); The fixing block (22) and the docking block (23) are made of the same material and have the same size; The docking block (23) and the fixing block (22) are connected via a plurality of connecting bolts, and correspondingly, bolt holes (26) are processed on the docking block (23) and the fixing block (22).

8. The processing method according to claim 1, characterized in that: The size of the accommodating cavity (24) is larger than the size of the conical end (11) and the toothed end (12) of the double-ended equal-diameter sleeve, that is, the diameter and width of the accommodating cavity (24) are larger than the diameter and width of the conical end (11) and the toothed end (12); The fixing block (22) is fixedly connected to the fixing boss (21) by welding; The outer diameter of the docking block (23) after docking with the fixing block (22) is equal to the outer diameter of the fixing boss (21).

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