Machining device and method for guide fillet of sealing structure

Abstract

The invention discloses a machining device and method for a guide fillet of a sealing structure. The machining device comprises a grinding head, abrasive paper and a positioning shaft, the grinding head is provided with a positioning cylinder and a rotary grinding face, and the rotary grinding face is formed by taking an inner concave arc R as a contour edge and taking the axis of the grinding head as a rotating shaft. Before a guide fillet is machined, abrasive paper is marked along the contour of a cutting sample plate and cut, then the abrasive paper is pasted to a grinding head through glue, a positioning shaft is inserted into a pipe joint, the grinding head is clamped through a handheld electric drill, a positioning cylinder is inserted into a positioning round hole of the positioning shaft, and the grinding head is pressed to a to-be-machined position for grinding; and finally, metallographic abrasive paper is used for polishing the ground round corner, and alcohol is used for cleaning the ground round corner. By the adoption of the guide fillet machining device and method, the problems that repair is difficult and the repair qualification rate is low after the guide fillet is missed to be machined can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of benchwork processing, and in particular relates to a processing device and method for guiding fillets in a pipe joint sealing structure. Background Art

[0002] like Fig. 9 As shown, a pipe joint has a sealing structure guide fillet at one end of the pipe joint ( Fig. 9 There is an internal thread on the inner wall of the pipe joint. The sealing structure guide fillet is an important sealing structure component during the assembly of the sealing ring of this type of sealing structure and the use of the product. The pipe joint parts are welded or assembled to other components to form the final product.

[0003] However, due to differences in conditions during actual sealing ring assembly or missed or incorrect processing of the guide fillet on the pipe joint, it is often necessary to temporarily supplement the processing (trim) of the guide fillet at the assembly site. However, since the pipe joint has been installed on the final product (such as a heat exchanger or a fuel tank), and the overall structure of the final product is different, it is either inconvenient to clamp the equipment or it is difficult to find the center of the circle on the machining equipment after clamping, resulting in the inability to use machining equipment to process the guide fillet.

[0004] The current solution is to use tools on site by fitters. However, the fillets processed by fitters using conventional tools not only have inconsistent fillet sizes at various locations on the circumference, but also have difficulty ensuring that the final shape is a fillet, and are very likely to be processed into chamfers, resulting in the final product's sealing not meeting the requirements.

[0005] Based on the above situation, it can be seen that the current sealing structure guide fillet usually has the following three problems during supplementary processing:

[0006] 1. After the final product is formed, it is not easy to clamp;

[0007] 2. It is difficult to find the center of the guide fillet on the machining equipment;

[0008] 3. The guide fillet sizes obtained by fitters using traditional processing methods are inconsistent and are easily processed into chamfers.

[0009] In summary, the existing supplementary processing method for the guide fillet of the sealing structure has many defects, which makes the guide fillet processing difficult and the processing qualification rate low. Summary of the invention

[0010] In view of the problems existing in the background technology, the present invention aims to provide a processing device and method for the guide fillet of a sealing structure, so as to solve the problems of processing difficulty and low rework qualification rate existing in the supplementary processing of the guide fillet as a part of the sealing structure in the existing pipe joint.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A processing device for guiding a rounded corner of a sealing structure, comprising:

[0013] A grinding head, wherein the grinding head comprises a rotating grinding surface formed by an inner concave arc R as a contour edge and an axis of the grinding head as a rotation axis, and an axial end of the grinding head also comprises a positioning cylinder, the positioning cylinder is coaxial with the axis of the grinding head, and the outer diameter of the positioning cylinder is smaller than the outer diameter of the end surface of the axial end;

[0014] Sandpaper, the sandpaper is attached to the rotating grinding surface;

[0015] The positioning shaft is a cylinder, and a positioning circular hole is opened on one axial end face of the positioning shaft. The inner diameter of the positioning circular hole is equal to the outer diameter of the positioning cylinder. The outer surface of the positioning shaft has an external thread that matches the internal thread of the pipe joint.

[0016] Furthermore, the grinding head also includes a clamping rod connected to the hand drill chuck.

[0017] Furthermore, the shape of the sandpaper is consistent with the shape of the rotating grinding surface after it is unfolded into a plane.

[0018] Furthermore, the positioning shaft also includes a pair of sockets, and the pair of sockets are distributed on the axial end surface where the positioning circular hole is located and are located on the radial line of the positioning circular hole.

[0019] As an option,

[0020] The material of the grinding head is a bakelite stick;

[0021] The material of the positioning shaft is 1Cr18Ni9Ti.

[0022] A method for processing a guide fillet of a sealing structure adopts the aforementioned processing device and comprises the following steps:

[0023] Step 1: determine the type of sandpaper according to the surface roughness requirement of the guide fillet on the pipe joint, cut the sandpaper and glue it to the rotating grinding surface of the grinding head with glue, and let it dry for later use;

[0024] Step 2: insert the positioning shaft into the pipe joint, and connect the positioning shaft with the internal thread of the pipe joint through the external thread on its surface;

[0025] Step 3: Connect the grinding head to the hand drill, and then insert the positioning cylinder of the grinding head into the positioning circular hole of the positioning shaft;

[0026] Step 4: Press the rotating grinding surface of the grinding head against the position of the guide fillet to be processed on the pipe joint, and start the hand drill to drive the grinding head to grind the guide fillet of the pipe joint.

[0027] Furthermore, in the step 1, the sandpaper is marked with a sandpaper cutting template, and the sandpaper cutting template is the shape of a rotating grinding surface unfolded into a plane.

[0028] Furthermore, in the step 2, the position of the tube clamp is first adjusted to a horizontal or vertical state, and then the positioning shaft is inserted into the tube joint.

[0029] Furthermore, in the step three, lubricating grease is applied on the surface of the positioning cylinder or the inner wall of the positioning circular hole.

[0030] Furthermore, the step 4 also includes a step 5, in which the guide fillet ground in the step 4 is polished with metallographic sandpaper, and then the surface is cleaned with alcohol.

[0031] Compared with the prior art, the present invention provides a device and method for processing the guide fillet of a sealing structure, which fundamentally solves the problems of difficult processing and low rework pass rate during supplementary processing of the guide fillet in the sealing structure of a pipe joint.

[0032] The processing device of the present invention realizes positioning by cooperating the external thread on the positioning shaft with the internal thread of the pipe joint, and then realizes the center alignment of the guide fillet by the clearance cooperation between the positioning circular hole on the positioning shaft and the positioning cylinder on the grinding head, which is convenient for the subsequent grinding of the guide fillet, thereby solving the problem of center alignment of the guide fillet. Furthermore, it is not necessary to clamp the final product as a whole on the machining equipment and then align the guide fillet of the pipe joint separately. The present invention uses a hand drill to directly grind, and the contour feature of the rotating grinding surface is an arc R to ensure that the guide fillet will not be processed into a chamfer.

[0033] The type of sandpaper is selected according to the surface roughness requirements of the guide fillet, and the pasting method can adapt to different needs.

[0034] After using the processing device of the present invention, there is no need to use special tooling to clamp the final product as a whole to the frame equipment. It is only necessary to stabilize the final product by hand or place the final product stably on the work surface. After adopting the processing method of the present invention, according to field verification statistics, the qualified rate of the guide fillet supplementary processing has increased from the original 50% to 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the sandpaper cutting sample;

[0036] Figure 2 is a schematic diagram of the grinding head;

[0037] Figure 3 It is the appearance of the grinding head after the sandpaper is attached to the rotating grinding surface;

[0038] Figure 4It is a schematic diagram of a handle used to install the positioning shaft;

[0039] Figure 5 It is a schematic diagram of the positioning axis;

[0040] Figure 6 It is a schematic diagram of the assembly of the positioning shaft and the pipe joint;

[0041] Figure 7 This is a state diagram of grinding the guide fillet using a grinding head;

[0042] Figure 8 yes Figure 7 A partial enlarged view of the middle guide fillet;

[0043] Fig. 9 It is the location diagram of the guide fillet of the pipe joint;

[0044] In the figure: 1-sandpaper cutting template; 2-grinding head; 21-positioning cylinder; 3-sandpaper; 4-positioning shaft; 41-external thread; 42-socket; 5-handle. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0046] On the one hand, considering that the on-site finishing and supplementary processing of the guide fillet of the sealing structure is limited in processing methods because it is assembled on products with different structures, it is not convenient to use machining equipment to process a separate guide fillet. On the other hand, when the guide fillet is processed using the traditional bench processing method, the fillet size of each part on the circumference is inconsistent, and it is difficult to ensure that it is a fillet, and it is easy to be processed into a chamfer, resulting in problems such as difficulty in processing the supplementary processing of the guide fillet of the sealing structure and a low rework pass rate.

[0047] like Figures 1 to 8As shown, a sealing structure-guided fillet processing device designed by the present invention includes a sandpaper cutting template 1, a grinding head 2, sandpaper 3, a positioning shaft 4 and a handle 5. The sandpaper cutting template 1 is used to mark the sandpaper 3, and the sandpaper cutting template 1 is the shape of the rotating grinding surface after it is unfolded into a plane. The grinding head 2 includes a rotating grinding surface formed with an inner concave arc R as a contour edge and the axis of the grinding head 2 as a rotating axis. The axial end of the grinding head 2 also has a positioning cylinder 21, which is coaxial with the axis of the grinding head 2, and the outer diameter of the positioning cylinder 21 is smaller than the outer diameter of the end face of the axial end. The grinding head 2 also includes a clamping rod connected to the chuck of a hand drill. The sandpaper 3 is pasted on the rotating grinding surface, and the shape of the sandpaper 3 is consistent with the shape of the rotating grinding surface after it is unfolded into a plane. The positioning shaft 4 is a cylinder, and a positioning circular hole is opened on one axial end face of the positioning shaft 4. The outer surface of the positioning shaft 4 has an external thread 41 that matches the internal thread of the pipe joint. The positioning shaft 4 also includes a pair of sockets 42, and the pair of sockets 42 are distributed on the axial end face where the positioning circular hole is located and are located on the radial line of the positioning circular hole. The handle 5 includes a straight head for inserting the pair of sockets 42, so that the positioning shaft 4 is driven to be screwed into the pipe joint by rotating the handle 5 to achieve threaded connection.

[0048] In this embodiment, the material of the sandpaper cutting template 1 is 1Cr18Ni9Ti, the thickness is 1mm, the inner diameter is Φ36mm, the outer diameter is Φ67.4mm, and the inner contour cutting line ( Figure 1 The length of the center C position is 97mm, and the outer contour cutting line ( Figure 1 The length of the handle 5 is 157mm, the material of the grinding head 2 is a bakelite stick, the inner concave arc R corresponding to the rotating arc surface is R10 (mm), the outer diameter of the positioning cylinder 21 is 18mm, the material of the positioning shaft 4 is 1Cr18Ni9Ti, the height is 78mm, the external thread 42 is M33X1.5-6g, the diameter of the positioning hole is 18mm, the groove depth of the socket 42 is 10mm, and the width is 3.2mm. The material of the handle 5 is 1Cr18Ni9Ti, the thickness is 3mm, the length is 25mm, and the head height at the assembly with the positioning shaft 4 is 20mm.

[0049] Before processing the guide fillet, first cut the sandpaper 3, mark the sandpaper 3 along the outline cutting line of the sandpaper cutting template 1, and cut it according to the marked line, such as Figure 1 . Paste the sandpaper 3, use glue to paste the cut sandpaper 3 on the rotating grinding surface of the grinding head 2, and let it dry naturally for 10 minutes. Figure 3 Use the handle 5 to assemble the positioning shaft 4 into the pipe joint, and lock the positioning shaft 4 into the pipe joint through the external thread 41 of the positioning shaft 4 and the height limit of the positioning shaft 4, such as Figures 4 to 6In order to facilitate the operation of personnel, the final product is turned over so that the pipe joint is in a horizontal or vertical state (here refers to the work platform on which the final product is placed). The hand drill is held, the clamping rod of the grinding head 2 is clamped, and the rotating grinding surface of the grinding head 2 is pressed against the guide fillet to be processed of the pipe joint, such as Figure 7 , relying on the positioning cylinder 21 at the end of the grinding head 2 and the positioning circular hole of the positioning shaft 4 to ensure that the grinding head 2 is coaxial with the pipe joint to be processed, Fig. 9 Grind at position D in the middle until the required guide radius is obtained. Figure 8 and Fig. 9 The coaxiality between the grinding head 2 and the guide fillet to be ground is ensured by the positioning shaft 4. After grinding, the original sharp corner is processed into a fillet. Finally, the ground guide fillet is polished with metallographic sandpaper, and the positioning shaft 4 is taken out by the handle 5, and the surface of the guide fillet is cleaned with alcohol.

[0050] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A processing device for guiding the rounded corners of a sealing structure, characterized in that: include: A grinding head (2), the grinding head (2) comprising a rotating grinding surface with an inner concave arc R as a contour edge and an axis of the grinding head (2) as a rotation axis, and a positioning cylinder (21) at the axial end of the grinding head (2), the positioning cylinder (21) being coaxial with the axis of the grinding head (2), and the outer diameter of the positioning cylinder (21) being smaller than the outer diameter of the end surface of the axial end; Sandpaper (3), the sandpaper (3) is pasted on the rotating grinding surface; The positioning shaft (4) is a cylinder, and a positioning circular hole is opened on one axial end face of the positioning shaft (4), the inner diameter of the positioning circular hole is equal to the outer diameter of the positioning cylinder (21), and the outer surface of the positioning shaft (4) has an external thread (42) matching the internal thread of the pipe joint.

2. A sealing structure guide fillet processing device according to claim 1, characterized in that: The grinding head (2) also includes a clamping rod connected to the hand drill chuck.

3. A sealing structure guide fillet processing device according to claim 1, characterized in that: The shape of the sandpaper (3) is consistent with the shape of the rotating grinding surface after it is unfolded into a plane.

4. A sealing structure guide fillet processing device according to claim 1, characterized in that: The positioning shaft (4) also includes a pair of sockets (42), and the pair of sockets (42) are distributed on the axial end surface where the positioning circular hole is located and are located on the radial line of the positioning circular hole.

5. The device for processing the guide fillet of a sealing structure according to claim 1, characterized in that: The material of the grinding head (2) is a bakelite stick; The material of the positioning shaft (4) is 1Cr18Ni9Ti.

6. A method for processing a guide fillet of a sealing structure, characterized in that: The processing device according to claim 1 is used, and comprises the following steps: Step 1: determine the type of sandpaper (3) according to the requirements of the surface roughness of the guide fillet on the pipe joint, cut the sandpaper (3) and stick the sandpaper (3) on the rotating grinding surface of the grinding head (2) by glue, and dry it for use; Step 2: insert the positioning shaft (4) into the pipe joint, and connect the positioning shaft (4) with the internal thread of the pipe joint through the external thread on its surface; Step 3, connect the grinding head (2) to the hand drill, and then insert the positioning cylinder (21) of the grinding head (2) into the positioning circular hole of the positioning shaft (4); Step 4: Press the rotating grinding surface of the grinding head (2) against the position of the guide fillet to be processed on the pipe joint, and start the hand drill to drive the grinding head (2) to grind the guide fillet of the pipe joint.

7. A method for processing a guide fillet of a sealing structure according to claim 6, characterized in that: In the step 1, the sandpaper (3) is marked with a sandpaper cutting template (1), wherein the sandpaper cutting template (1) is the shape of a rotating grinding surface unfolded into a plane.

8. A method for processing a guide fillet of a sealing structure according to claim 6, characterized in that: In the second step, the position of the pipe clamp is first adjusted to a horizontal or vertical state, and then the positioning shaft (4) is inserted into the pipe joint.

9. A method for processing a guide fillet of a sealing structure according to claim 6, characterized in that: In the step three, lubricating grease is applied to the surface of the positioning cylinder (21) or the inner wall of the positioning circular hole.

10. A method for processing a guide fillet of a sealing structure according to claim 6, characterized in that: The step 4 also includes a step 5, in which the guide fillet ground in the step 4 is polished with metallographic sandpaper, and then the surface is cleaned with alcohol.

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