Technological processing method for processing large-diameter thin-wall cambered surface part

Abstract

The invention discloses a process processing method for processing a large-diameter thin-wall cambered surface part. The process processing method comprises the following steps: selecting a proper plate material as a blank profile of the cambered surface part; a plurality of arc-shaped part appearances are cut in a cutting mode and are separated from the blank profile, and blank arc-shaped parts are obtained; and the blank arc-shaped part is fixed through a machining clamp, milling machining is conducted, and the finished large-diameter thin-wall cambered surface part is obtained. According to the process machining method, the blank profile selects the plate material to replace a round pipe material, the purchase cost of the round pipe material is greatly reduced, then according to the sizes of the parts and the sizes of the small plate materials, the numbers of the parts distributed on the small plate materials can be calculated through software drawing, and then linear cutting is conducted according to the positions of the single parts distributed on the plate materials; partial feature machining of the part is completed through sequential single cutting, the whole process is greatly driven compared with the prior art, no round pipe material is adopted in the whole process, and therefore the problem that follow-up parts cannot be machined due to cracking is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of process equipment manufacturing, and in particular to a process method for processing large-diameter thin-walled cambered parts. Background Art

[0002] In mechanical processing, round tubes are often used when selecting the initial blanks for large-diameter thin-walled curved parts. After turning, milling is performed based on the diameter of the round tube after turning and the size of individual parts to calculate the number of parts evenly distributed around the circumference of the round tube. While completing the thin-walled curved feature processing, a 0.3-0.5 depth margin is reserved in the self-separation of individual parts. After processing, individual parts are guaranteed to be distributed around the circumference of the round tube, and the fitter uses clamps to peel off individual parts.

[0003] Due to the deformation caused by turning, the arrangement of the milling process, the design of the fixture, and the size of the cutting force during the self-pre-separation process are very demanding. The initial blank is a round tube. Not only does it cost a lot to purchase the blank, but it is also difficult to select the fixture blank due to the large diameter of the arc surface of the part. Especially in the self-pre-separation, where the part is severely deformed, a single part falls off before the tool is completed, causing the round tube to crack. The individual parts in other parts cannot complete subsequent processing, resulting in serious scrapping. In addition, due to the influence of the cutting force, small tools, small cutting and small feed are used during processing, and the processing efficiency is low. Summary of the invention

[0004] In view of this, in order to solve the problems in the prior art that the initial blank is difficult to select and the procurement cost is high, the parts are easily deformed during turning during the processing and manufacturing process, and in the numerical milling process, due to the accumulation of deformation errors in the previous process, the parts often rotate or move during the milling single separation, resulting in a low part qualification rate, inconvenient fixture manufacturing, and low processing efficiency, the present invention proposes a process processing method for processing large-diameter thin-walled arc parts.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A process for processing large-diameter thin-walled curved surface parts, comprising the following steps:

[0007] Step 1. Select appropriate plate material as the blank profile of the curved surface parts;

[0008] Step 2, cutting out a plurality of arc-shaped parts and separating them from the blank profile to obtain the blank arc-shaped parts;

[0009] Step 3: Fix the rough arc-shaped parts with a processing fixture and perform milling to obtain finished large-diameter thin-walled arc-shaped parts.

[0010] As a further improvement of the above technical solution:

[0011] Preferably, the step 1 also includes:

[0012] Step 11, select small sheet material as blank profile;

[0013] Step 12: According to the size of the large-diameter thin-walled curved parts and the size of the small sheet, calculate the number of parts distributed on the small sheet by manual drawing or software drawing.

[0014] Preferably, the cutting method is wire cutting.

[0015] Preferably, the wire cutting step includes:

[0016] Step 21. Draw the shape of the workpiece on the blank according to the size of the workpiece and drill the threading holes;

[0017] Step 22, first cutting, wire cutting finds a positive circle point at the threading hole position, and cuts along the drawn shape to the end point of the first cutting. The end point of the first cutting is the bottom position, which is flush with the initial position of the top end of the wire feed, forming the shape of a large-diameter thin-walled arc surface part;

[0018] Step 23, secondary cutting, starting from the bottom position as the starting point of the second cutting, cutting upwards until the initial position of the uppermost wire entry, and cutting to the threading hole to complete the separation of several blank arc parts.

[0019] Preferably, the secondary cutting route in Step 23 is a broken line segment.

[0020] Preferably, the processing fixture comprises a fixture body and a fixing component, the fixture body is provided with a positioning groove, the upper end of the fixture body is provided with a detachable fixing component, and the fixing component and the fixture body jointly fix the blank arc-shaped part.

[0021] Preferably, a positioning pin is provided on the positioning groove.

[0022] Preferably, a reference alignment plane is provided at one end of the clamp body.

[0023] Preferably, the fixing assembly includes a pressing plate and a fixing screw, the pressing plate is used to be placed on the upper end of the blank arc-shaped part, the fixing screw passes through the center hole of the pressing plate and the lower end is screwed to the threaded hole in the center of the upper end of the fixture body.

[0024] Preferably, the number of the positioning grooves is two, and the two positioning grooves are symmetrically arranged with respect to the center plane of the clamp body.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the process processing method provided by the present invention, sheet materials are used instead of round tube materials for blank profiles, which greatly reduces the purchase cost of round tube materials. Then, according to the size of the parts and the size of the small plate materials, the number of parts distributed on the small plate materials can be calculated through software drawing, and then the wire cutting is carried out according to the position of the individual parts distributed on the plate materials, and the partial feature processing of the parts is completed by cutting one by one in sequence. The whole process is greatly driven by the existing technology. Round tube materials are not used in the whole process, thereby avoiding cracking, which makes it impossible to process subsequent parts.

[0027] 2. The present invention also designs a special fixture according to the special needs of this process, which is conducive to completing the processing of the remaining parts of the parts by milling. The fixture has the effects of easy installation and accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the first cutting of the process flow of the present invention;

[0029] Figure 2 It is a schematic diagram of secondary cutting of the process flow of the present invention;

[0030] Figure 3 for Figure 2 Schematic diagram of the enlarged view of the secondary cutting part;

[0031] Figure 4 It is a schematic diagram of the top view of the structure of the clamp body of the present invention;

[0032] Figure 5 for Figure 4 AA cross-sectional structure diagram;

[0033] Figure 6 It is a schematic diagram of the front and cross-sectional structure of the clamp body and the pressing plate of the present invention;

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the processing workpiece of the present invention.

[0035] In the figure: 1. fixture body; 2. positioning groove; 3. positioning pin; 4. reference alignment plane; 5. pressure plate; 6. fixing screw; 7. workpiece. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] As attached Figure 7 The figure shows a schematic diagram of a large-diameter, thin-walled arc surface part that needs to be processed according to the technical solution.

[0040] The processing scheme of this technology is described as follows:

[0041] 1. The blank profile uses sheet materials instead of round tube materials, which greatly reduces the procurement cost of round tube materials.

[0042] 2. As attached Figure 1 As shown, according to the size of large-diameter thin-walled arc surface parts and the size of small plates, the number of parts distributed on the small plates can be calculated through software drawing, and N small workpieces 7 can be drawn on the plate blank. The process hole ￠A1 on the blank is a threading hole (wire cutting machine tool).

[0043] 3. As attached Figure 1 As shown in the figure, wire cutting first finds the origin at the threading hole position, and then cuts along the adjacent Figure 1 The cutting starts from the outline trajectory of the N small workpieces 7, and the first outline is completed at the end point of the first cutting. The end point of the first cutting is the bottom position point, and the bottom position point is flush with the initial position of the top end of the line, forming the shape of a large diameter thin-walled arc surface part

[0044] 4. Then follow Figure 3 With attached Figure 4The second cutting start point is the end point of the first cutting, and the second cutting end point should be at least at the initial position of the wire feed and at most at the threading hole, thus completing the separation of N single parts, and obtaining the attached Figure 1 The blank shape of the part.

[0045] At the same time, by Figure 2 It can be seen that the second cutting thread fold line segment is an important reason because the right side is in an arc shape during the first cutting, but the end face is a plane, so when cutting on the left side, it must be symmetrical with the right side, thereby restoring the shape finally processed by the round tube material in the prior art.

[0046] 5. The finished blank parts are processed by milling machine, mainly including deburring, hole cutting and tapping.

[0047] In order to facilitate the milling machine to process the blank, a four-axis machining special fixture is designed in this technical solution, as shown in the attached Figure 4 To Attachment Figure 6 As shown, the specific structure is as follows:

[0048] Two locating grooves 2 are provided on the upper end of the fixture body 1. The fixture body 1 is formed by integral processing, thereby ensuring the consistency of the dimensional position accuracy between the locating groove 2 of the first station and the locating groove 2 of the second station. The values ​​of point C2 (the arc origin of the locating groove 2 of the first station) and point C3 (the arc origin of the locating groove 2 of the second station) relative to point C1 (the origin of the fixture body 1) are for determining the part processing coordinate system. The pin hole on the fixture body 1 and the locating pin 3 are matched with H7 / g6. At the same time, the locating pin 3 is located on the locating groove 2, and the straight surface of the locating pin 3 realizes precise orientation with the side of the part.

[0049] During operation, the fixture body 1 is directly mounted on the milling machine workbench through screws, nuts and a pressure plate 5. The clamping ensures that the first station positioning groove 2 and the second station positioning groove 2 of the fixture body 1 are aligned with the attachment. Figure 3 One side of the fixture body 11 is the reference calibration plane 4.

[0050] See Figure 4 The workpiece 7 is placed in the first station's positioning groove 2 and the second station's positioning groove 2, and the side surface is closely attached to the straight surface of the positioning pin 3 to achieve precise orientation, which also ensures the positional relationship between the center of the part and the center of the fixture body 1. Then the pressing plate 5 and the fixing screws 6 fix the workpiece 7 on the fixture body to complete the part clamping at each station.

[0051] Determination of the origin of the machining coordinate system

[0052] See Figure 3The fixture body 1 is installed on the rotation center point of the worktable of the horizontal machining center, and the center coordinate point (X and Z) of the fixture body 1 can be found. Then the X point is offset by the C2 value (C2=C3), and Y is established on the bottom surface of the positioning groove 2 of the first station of the fixture body 1 and the positioning groove 2 of the second station, and the coordinate point of the workpiece 7 can be found.

[0053] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for processing large-diameter thin-walled curved parts, characterized in that: The following steps are involved: Step 1. Select appropriate plate material as the blank profile of the curved surface parts; Step 2, cutting out a plurality of arc-shaped parts and separating them from the blank profile to obtain the blank arc-shaped parts; Step 3: Fix the rough arc-shaped parts with a processing fixture and perform milling to obtain finished large-diameter thin-walled arc-shaped parts.

2. The process for processing large-diameter thin-walled cambered parts according to claim 1 is characterized in that: The step 1 also includes: Step 11, select small sheet material as blank profile; Step 12: According to the size of the large-diameter thin-walled curved parts and the size of the small sheet, calculate the number of parts distributed on the small sheet by manual drawing or software drawing.

3. The process for processing large-diameter thin-walled cambered parts according to claim 1, characterized in that: The cutting method is wire cutting.

4. The process for processing large-diameter thin-walled cambered parts according to claim 3 is characterized in that: The cutting steps of the wire cutting are as follows: Step 21, draw the shape of the workpiece (7) on the blank according to the size of the workpiece (7), and punch the threading holes; Step 22, the first cutting, wire cutting finds the right circle point at the threading hole position, and cuts along the drawn shape to the bottom position. The bottom position is flush with the initial position of the top end of the wire feed, forming the shape of a large diameter thin-walled arc surface part; Step 23, secondary cutting, starting from the bottom position as the starting point of the second cutting, cutting upwards until the initial position of the uppermost wire entry, and cutting to the threading hole to complete the separation of several blank arc parts.

5. The process for processing large-diameter thin-walled cambered parts according to claim 4, characterized in that: The secondary cutting route in Step 23 is a broken line segment.

6. The process for processing large-diameter thin-walled cambered parts according to claim 1, characterized in that: The processing fixture comprises a fixture body (1) and a fixing component. The fixture body (1) is provided with a positioning groove (2). The upper end of the fixture body (1) is provided with a detachable fixing component. The fixing component and the fixture body (1) jointly fix the blank arc-shaped part.

7. The process for processing large-diameter thin-walled cambered parts according to claim 6, characterized in that: A positioning pin (3) is provided on the positioning groove (2).

8. The process for processing large-diameter thin-walled cambered parts according to claim 6, characterized in that: A reference calibration plane (4) is provided at one end of the clamp body (1).

9. The process for processing large-diameter thin-walled cambered parts according to claim 6, characterized in that: The fixing assembly comprises a pressing plate (5) and a fixing screw (6); the pressing plate (5) is used to be placed on the upper end of the blank arc-shaped part; the fixing screw (6) passes through the center hole of the pressing plate (5) and the lower end is screwed to the threaded hole at the center of the upper end of the clamp body (1).

10. The process for processing large-diameter thin-walled cambered parts according to claim 6, characterized in that: The number of the positioning grooves (2) is two, and the two positioning grooves (2) are symmetrically arranged with respect to the center plane of the clamp body (1).

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