CN117123682A

CN117123682A - Feature line processing method and device and shell structure

Info

Publication number: CN117123682A
Application number: CN202311376858.3A
Authority: CN
Inventors: 沈洪庆; 刘占五; 刘鹏飞
Original assignee: Beijing Jidu Technology Co Ltd
Current assignee: Beijing Jidu Technology Co Ltd
Priority date: 2023-10-23
Filing date: 2023-10-23
Publication date: 2023-11-28
Anticipated expiration: 2043-10-23
Also published as: CN117123682B

Abstract

The application discloses a characteristic line processing method and device, a shell structure and a vehicle. The processing method of the characteristic line comprises the following steps: performing one-time forming processing on a workpiece so as to form passivation characteristic lines on the workpiece; performing secondary forming processing on the workpiece with the passivation characteristic line to process the passivation characteristic line into a sharpened characteristic line; the chord length of the passivation characteristic line is larger than that of the sharpening characteristic line in the section of the same position of the workpiece, and the characteristic line processing method can avoid the problems of cracking or sliding of the characteristic line in the forming process.

Description

Feature line processing method and device and shell structure

Technical Field

The application relates to the technical field of stamping metals, in particular to a characteristic line processing method, a processing device and a shell structure.

Background

In the related art, in the body molding, product defects such as cracking, sliding lines and the like occur in the forming process of sharp feature lines. To address this problem, only sharp feature lines are typically abandoned, and defects are avoided or alleviated by increasing the corner radius of the feature lines, or altering the part material. However, the rounded corners are increased to influence the modeling style of the vehicle body, the material replacement also increases the weight of the vehicle body, and the endurance and the dynamic performance of the whole vehicle are influenced.

Therefore, a new technical solution is needed to solve the above technical problems.

Disclosure of Invention

The application aims to provide a novel technical scheme of a characteristic line processing method.

According to a first aspect of the present application, a feature line processing method is provided. The processing method of the characteristic line comprises the following steps: performing one-time forming processing on a workpiece so as to form passivation characteristic lines on the workpiece; performing secondary forming processing on the workpiece with the passivation characteristic line to process the passivation characteristic line into a sharpened characteristic line; and the chord length of the passivation characteristic line is larger than that of the sharpening characteristic line in the section of the same position of the workpiece.

Optionally, the passivation characteristic line is a curved surface structure with continuous curvature.

Optionally, along the length direction of the passivation characteristic line, the passivation characteristic line is in an equal chord length form or a gradual chord length form.

Optionally, the sharpening feature line is the same as the chord length variation of the passivation feature line.

Optionally, the variation between the vertices of the passivation feature line and the sharpening feature line is x, which satisfies: x is more than 0mm and less than or equal to 1mm.

Optionally, after the workpiece is subjected to one-time forming processing, the rebound amount of the workpiece is less than or equal to 2mm.

Optionally, the method for processing the characteristic line comprises a trimming process I, a trimming process II and a forming process.

Optionally, the first trimming process is incorporated into the second trimming process; or, the forming process is incorporated into the trimming process one; or, the first trimming step is integrated into the second trimming step.

According to a second aspect of the present application, there is provided a feature line processing apparatus. The processing device is suitable for carrying out secondary forming processing on a workpiece with a passivation characteristic line so as to process the passivation characteristic line into a sharpening characteristic line.

Optionally, the shaping tool comprises a shaping tool and a die which are oppositely arranged, wherein pressing plates are arranged on two opposite sides of the shaping tool, and the pressing plates can press the workpiece to the die.

Optionally, a distance between one end of the shaping tool and the end of the sharpening characteristic line is a, which satisfies: a is more than or equal to 10mm.

Optionally, the pressing plate has a strong pressing area, one end of the strong pressing area is an end of the pressing plate, which is close to the shaping tool, and the width of the strong pressing area is b, so that the requirements are satisfied: b is more than or equal to 30mm.

Optionally, a parting line gap between the shaping tool and the pressing plate is c, which satisfies: c is less than or equal to 0.3mm.

Optionally, the forming device comprises an upper die and a lower die, wherein the workpiece is arranged between the upper die and the lower die, and the upper die and the lower die jointly act on the workpiece to perform secondary forming processing on the workpiece.

Optionally, two opposite sides of the lower die are provided with blank holders, and the blank holders are used for pressing the edges of the workpiece on the upper die.

According to a third aspect of the present application, there is provided a housing structure. The housing structure is provided with a feature line machined according to the machining method of the above-described embodiment.

According to a fourth aspect of the present application, a vehicle is provided. The vehicle includes the housing structure of the above embodiment.

The technical effect of the application is that the characteristic line processing method comprises the following steps: performing one-time forming processing on a workpiece so as to form passivation characteristic lines on the workpiece; and performing secondary forming processing on the workpiece with the passivation characteristic line to process the passivation characteristic line into a sharpened characteristic line.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a flow chart of a feature line processing method according to an embodiment of the present application.

Fig. 2 is a schematic diagram of the structure of passivation and sharpening features of an embodiment of the present application.

Fig. 3 is a schematic structural view of passivation feature lines of a workpiece according to an embodiment of the application.

Fig. 4 to 7 are schematic structural views of a processing apparatus according to an embodiment of the present application.

Reference numerals:

1. a workpiece; 11. passivating the feature line; 12. sharpening the feature line; 13. a first plate; 14. a second plate;

2. a processing device; 21. shaping tools; 22. a mold; 23. a pressing plate; 24. an upper die; 25. a lower die; 26. edge pressing rings; 27. a cylinder;

3. curvature comb.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

According to one embodiment of the present application, a feature line processing method is provided. Referring to fig. 1, the feature line processing method includes: performing one-time forming processing on the workpiece 1 so as to enable the workpiece 1 to form passivation characteristic lines 11; the workpiece 1 having the passivation feature line 11 is subjected to a secondary forming process to process the passivation feature line 11 into a sharpened feature line 12. Wherein, in the section of the same position of the workpiece 1, the chord length of the passivation characteristic line 11 is larger than the chord length of the sharpening characteristic line 12. For example, as shown in fig. 2, the chord length of the passivation feature line is L1, and the chord length of the sharpening feature line is L2, satisfying L1 > L2. The chord length of the passivation characteristic line 11 is set larger, so that the workpiece 1 can be prevented from cracking when the workpiece 1 is punched. During the sharpening process, the chord length of the sharpening characteristic line 12 is reduced to meet the machining requirements. Further, the chord length of the characteristic line is gradually reduced, so that the workpiece 1 can be prevented from cracking when the workpiece 1 is punched.

In this example, in the feature line processing, the workpiece 1 is first subjected to a forming process to form the passivation feature line 11 on the workpiece 1. The workpiece 1 having the passivated feature 11 is then subjected to a secondary forming process to process the passivated feature 11 into a sharpened feature 12. According to the characteristic line processing method, the workpiece 1 is firstly subjected to passivation treatment to form the passivation characteristic line 11, and then the passivation characteristic line 11 is subjected to sharpening treatment to process the passivation characteristic line 11 into the sharpened characteristic line 12.

Referring to fig. 2, after the workpiece 1 is subjected to the primary forming process, the workpiece 1 has a first plate 13 and a second plate 14, and an arc-shaped plate structure is formed between the first plate 13 and the second plate 14, thereby forming the passivation feature line 11. The passivation feature line 11 is then subjected to a secondary forming process so that the passivation feature line 11 is processed into a sharpened feature line 12.

Referring to fig. 1, the feature line processing method includes:

and S100, performing one-time forming processing on the workpiece 1 so as to enable the workpiece 1 to form passivation characteristic lines 11.

The workpiece 1 to be treated is first subjected to a forming process. That is, the workpiece 1 is subjected to passivation treatment to machine the workpiece 1 into the passivation feature line 11.

S200, performing secondary forming processing on the workpiece 1 with the passivation feature line 11 to process the passivation feature line 11 into a sharpened feature line 12.

After the passivation feature line 11 is formed by performing the primary forming process on the workpiece 1, the passivation feature line 11 is subjected to the secondary forming process. That is, the workpiece 1 is subjected to a sharpening process to shape the passivation feature line 11 into a sharpened feature line 12, that is, to form a sharp feature line.

In this example, the passivation characteristic line 11 has a chord length greater than that of the sharpening characteristic line 12 in a section at the same position of the workpiece 1 along the chord length direction of the characteristic line. That is, the opening of the passivation feature line 11 is larger than the opening of the sharpening feature line 12.

In one example, referring to fig. 2, when the passivation feature line 11 is processed into the sharpened feature line 12, and the variation between the passivation feature line 11 and the vertex of the sharpened feature line 12 is set to x, the following is satisfied:

x=），

where L1 is the chord length of the passivation feature line 11, L2 is the chord length of the sharpened feature line, α is the angle between the tangent line of the passivation feature line 11 and the chord length of the passivation feature line, and R is the radius of curvature of the passivation feature line 11.

In this example, the chord length L1 of the passivation feature line 11, the radius of curvature R of the passivation feature line 11, and the angle α between the tangent to the passivation feature line 11 and the passivation feature line chord length are typically known amounts or readily available amounts. By the above formula, in the case that the chord length of the sharpening characteristic line is unknown, the chord length L2 of the sharpening characteristic line can be calculated according to the variable x between the passivation characteristic line 11 and the vertex of the sharpening characteristic line 12, the chord length L1 of the passivation characteristic line 11, the curvature radius R of the passivation characteristic line 11, and the angle α between the tangent line of the passivation characteristic line 11 and the chord length of the passivation characteristic line.

Under the condition that the variation x between the passivation characteristic line 11 and the vertex of the sharpening characteristic line 12 is unknown, the variation x between the passivation characteristic line 11 and the vertex of the sharpening characteristic line 12 can also be calculated according to the chord length L1 of the passivation characteristic line 11, the curvature radius R of the passivation characteristic line 11, and the included angle α between the tangent line of the passivation characteristic line 11 and the chord length of the passivation characteristic line. The acquisition of various parameters in the characteristic line processing method is facilitated by the formula.

In one example, referring to fig. 2, the variation between the vertices of the passivation feature line 11 and the sharpening feature line 12 is x, which satisfies: x is more than 0mm and less than or equal to 1mm.

In this example, 0.ltoreq.0）≤1mm。

Wherein, the value of x can be 1mm, 0.8mm, 0.5mm or 0.3mm, etc. The variation between the vertices of the passivation line 11 and the sharpening line 12 satisfies the x value, so that the variation of the workpiece 1 is small during the secondary forming process, so as to avoid cracking of the workpiece 1.

Of course, as to the specific value of x, those skilled in the art can determine the actual situation, and the specific limitation is not set forth herein.

In one example, the passivation line 11 is a curved structure with continuous curvature.

The workpiece 1 is subjected to a forming process such that the passivation feature line 11 is formed on the workpiece 1. The passivation line 11 is a curved structure satisfying the curvature continuity. Curvature continuity, i.e., G2 continuity, means that the curved surface or curve point is continuous, and all connected line segments and curved surface pieces are in tangent relation. As shown in fig. 3, it is possible to judge that the passivation characteristic line 11 reaches G2 continuity by the curvature comb.

In one example, the passivation feature line 11 is in the form of an equal chord length or a gradual chord length along the length of the passivation feature line 11.

Along the length direction of the passivation feature line 11, the chord length of the passivation feature line 11 is in an equal length form, i.e., the chord lengths are all equal. Alternatively, the chord length of the passivation feature line 11 is in a gradual form, i.e., the chord length gradually increases or gradually decreases from one end of the passivation feature line 11 to the other end. Of course, regarding the form of the chord length, those skilled in the art may depend on the actual situation, and are not particularly limited herein.

For example, the passivation feature line 11 is in the form of an equal chord length, the angles of the feature line are consistent throughout, and the stress is uniform throughout to avoid local cracking of the workpiece. The passivation feature line 11 is in a gradual change form, so that local stress can be eliminated, slip lines can be prevented from being generated, and cracking of the workpiece 1 can be avoided.

In one example, the sharpening feature 12 is the same as the chord length variation of the passivation feature 11.

The chord length form of the sharpened feature line 12 formed after the secondary forming process is identical to the form of the passivation feature line 11, i.e., remains the same. That is, when the passivation feature line 11 has an equal chord length, the sharpening feature line 12 has an equal chord length. When the passivation feature line 11 is in the form of a gradual change in chord length, the sharpening feature line 12 is also in the form of a gradual change in chord length. So as to keep the modeling style of the workpiece 1 consistent.

Of course, the chord length or the chord length gradient trend of the characteristic line can be determined by those skilled in the art according to the actual situation, and is not specifically limited herein.

In one example, after the completion of the primary forming process on the workpiece 1, the rebound amount of the workpiece 1 is 2mm or less.

After the workpiece 1 is formed into the passivation characteristic line 11 by one-time forming, the rebound quantity of each part of the whole structure of the workpiece 1 is less than or equal to 2mm, namely the rebound trend and the rebound quantity value of the whole workpiece 1 are not obviously changed. For example, the rebound amount may be 0.5mm, 1mm, 1.5mm, 2mm, or the like, all of which can satisfy the processing requirements. After passivation treatment of the workpiece 1, the overall resilience of the workpiece 1 is less than or equal to 2mm, so that the deformation of the workpiece 1 is within a preset range during sharpening treatment of the workpiece 1, and local cracking of the workpiece 1 is avoided. Meanwhile, after the workpiece 1 is machined, the internal stress of the workpiece 1 is small, and the workpiece 1 can be effectively prevented from being cracked.

In one example, the feature line processing method includes a trimming process one, a trimming process two, and a forming process.

The processing method of the characteristic line further comprises a trimming process I, a trimming process II and a forming process. The trimming step is to trim the workpiece 1. The forming step may be to process the workpiece 1 in other configurations, for example, in other turnover configurations.

In one example, the first trimming process is incorporated into the second trimming process; or, the forming process is incorporated into the trimming process one; or, the first trimming step is integrated into the second trimming step.

In this example, in order for the overall process to meet the requirements of the press line. The process steps may be combined. For example, the first trimming step is incorporated into the second trimming step, that is, the first trimming step and the second trimming step are performed in the same step, and then the forming step is performed.

Alternatively, the shaping process is incorporated into the trimming process one. Or the first trimming step is incorporated into the second trimming step.

Of course, the combination of the above steps is not particularly limited as a person skilled in the art can determine the actual situation.

According to another embodiment of the present application, there is provided a characteristic line processing apparatus 2. Referring to fig. 4, the processing device 2 is adapted to perform a secondary forming process on a workpiece 1 having a passivation feature line 11 to process the passivation feature line 11 into a sharpened feature line 12.

In this example, the workpiece 1 is once formed into a passivation feature line 11, and then is subjected to secondary forming processing in the feature line processing apparatus 2 of the present application to process the passivation feature line 11 into a sharpened feature line 12.

In one example, the processing device 2 includes a shaping tool 21 and a die 22 that are disposed opposite to each other, and pressing plates 23 are disposed on opposite sides of the shaping tool 21, where the pressing plates 23 are capable of pressing the workpiece 1 against the die 22.

Referring to fig. 4, the processing apparatus 2 includes a shaping tool 21 and a die 22 disposed opposite to each other, and pressing plates 23 are disposed on opposite sides of the shaping tool 21. The shaping tool 21 is located at the lower side of the die 22, and two pressing plates 23 are located at both sides of the shaping tool 21, respectively. The truing tool 21 is provided with a convex portion facing the die 22, and the die 22 is provided with a concave portion corresponding to the convex portion. The workpiece 1 is placed on the upper end of the shaping tool 21, and the passivation feature line 11 corresponds to the positions of the protruding portion and the recessed portion, so that the die 22 moves downward, and the die 22 abuts against the workpiece 1 and can process the passivation feature line 11 into the sharpened feature line 12 in cooperation with the shaping tool 21.

In this example, referring to fig. 4, the pressing plates 23 on both sides of the shaping tool 21 are movable toward the die 22 and can be brought into contact with the workpiece 1, and the other end of the workpiece 1 is brought into contact with the die 22 to fix the workpiece 1.

The platen 23 may be driven by a cylinder 27, for example, a nitrogen cylinder or the like may be used. Of course, those skilled in the art may, depending on the actual situation, not specifically limited herein.

Referring to fig. 5, in this example, the shaping tool 21 may also be located above the die 22. The platen 23 is also located above the die 22 and on opposite sides of the shaping tool 21. The die 22 is provided with a convex portion facing the shaping tool 21, and the shaping tool 21 is provided with a concave portion mating with the convex portion. The secondary forming process, the workpiece 1 is placed on the die 22, and the passivation feature line 11 corresponds to the position of the boss, and the shaping tool 21 can be moved downward to process the passivation feature line 11 into the sharpened feature line 12. The platen 23 can be moved downward to fix the work 1.

Of course, the structure and arrangement of the shaping tool 21 and the die 22 may be determined by those skilled in the art according to the actual situation, and are not particularly limited herein.

In one example, referring to fig. 4, the distance a between one end of the shaping tool 21 and one end of the sharpening characteristic line 12 is as follows: a is more than or equal to 10mm.

Referring to fig. 4, in this example, one end of the truing tool 21 is spaced a from the end of the sharpened feature line 12 near the end so that the truing tool 21 can press the workpiece 1 over a large area to prevent the workpiece 1 from cracking when the partial truing tool 21 presses the workpiece 1. The value of a may be 10mm, 12mm, 15mm, 16mm, etc., and those skilled in the art will be able to determine the actual situation, and is not particularly limited herein.

In this example, the shaping tool 21 may be symmetrically disposed, and the distances between the two ends of the shaping tool 21 and the end of the sharpened feature line 12 are a, so that the forces on the two ends of the feature line are uniform.

In one example, referring to fig. 4, the pressing plate 23 has a strong pressing area, one end of the strong pressing area is an end of the pressing plate 23 near the shaping tool 21, and a width of the strong pressing area is b, where: b is more than or equal to 30mm.

Referring to fig. 4, the pressing plate 23 can be abutted against the workpiece 1 and can fix the workpiece 1. When the pressing plate 23 is abutted against the workpiece 1, a strong pressing area is provided. Wherein the width of the strong pressure area is b. One end of the strong pressing area is the end of the pressing plate 23 close to the shaping tool 21.

In this example, the value of b may be 30mm, 32mm, 35mm, 40mm, 45mm, or the like. Those skilled in the art will recognize the actual situation, and are not particularly limited herein.

Referring to fig. 4, in this example, two pressing plates 23 are provided, and the two pressing plates 23 are symmetrically disposed on both sides of the truing tool 21.

In one example, referring to fig. 4, the parting line gap between the shaping tool 21 and the pressing plate 23 is c, which satisfies the following conditions: c is less than or equal to 0.3mm.

Referring to fig. 4, there is a gap between the shaping cutter 21 and the platen 23, which is a parting line of the shaping cutter 21. The parting line has a gap width c. The value of c is set smaller to reduce the influence of the parting line on the surface of the workpiece 1, thereby ensuring the aesthetic property of the workpiece 1 after the processing is finished. Wherein, the value of c can be 0.3mm, 0.2mm, 0.1mm, etc. Those skilled in the art will recognize the actual situation, and are not particularly limited herein.

In this example, the gap width between both sides of the shaping tool 21 and the platen 23 is c.

In one example, referring to fig. 6, the workpiece 1 is provided between the upper die 24 and the lower die 25, and the upper die 24 and the lower die 25 cooperate with the workpiece 1 to perform secondary forming processing on the workpiece 1.

Referring to fig. 6, in this example, the processing apparatus 2 includes an upper die 24 and a lower die 25, and the workpiece 1 is placed on the upper end of the lower die 25 at the time of the secondary forming processing, and the upper die 24 is capable of moving downward to abut the workpiece 1 and process the passivation feature line 11 into the sharpened feature line 12 in cooperation with the lower die 25. The upper die 24 is provided with a protruding portion facing the lower die 25, the lower die 25 is provided with a recess portion cooperating with the protruding portion, the passivation feature line 11 corresponds to the positions of the protruding portion and the recess portion, and the protruding portion and the recess portion cooperate to enable processing of the passivation feature line 11 into the sharpened feature line 12.

In this example, referring to fig. 6, an air cylinder 27 is connected to the upper die 24 to drive the upper die 24 to move upward or downward. The cylinder 27 is provided in plural, for example, two, three, four, or the like may be provided to improve the stability of the movement of the driving upper die 24. Of course, regarding the number of the cylinders 27, those skilled in the art can determine the actual situation, and are not specifically limited herein.

In one example, referring to fig. 7, the lower die 25 is provided with a bead ring 26 on opposite sides thereof, and the bead ring 26 is used to press the edge of the workpiece 1 against the upper die 24.

The processing device 2 shown in fig. 4 to 6 is capable of fixing a part of the workpiece 1, that is, fixing positions near both sides of the passivation feature line 11, and performing secondary forming processing on the passivation feature line 11. The processing device 2 shown in fig. 7 can fix the entire workpiece 1, and the edge portions on both sides of the workpiece 1 are correspondingly provided with the blank holders 26 for fixing the edge portions of the workpiece 1 to the upper die 24. The upper die 24 and the lower die 25 are provided with protrusions and recesses at positions corresponding to the passivation feature lines 11, the protrusions and recesses being able to cooperate with each other to process the passivation feature lines 11 into broken flower feature lines.

In this example, a cylinder 27 is connected to the edge bead 26, and the edge bead 26 can be driven to move upward or downward by the cylinder 27.

According to another embodiment of the present application, a housing structure is provided. The housing structure is provided with the feature lines processed according to the processing method of the above-described embodiment, and the sharp feature lines are formed by performing secondary forming processing by the above-described processing device 2.

In this example, the housing structure may be a vehicle body housing, a door structure of a vehicle, a housing of a home electric appliance, a housing structure of a digital electronic product, or the like. The method for processing the characteristic line in the embodiment processes the characteristic line, and the device for processing the characteristic line 2 processes the sharp characteristic line, so that the processed sharp characteristic line can avoid the problems of cracking or sliding of the characteristic line in the process of forming.

In this example, the vehicle includes the case structure of the above embodiment, the case structure is provided with the feature line processed according to the processing method of the above embodiment, and the sharp feature line is formed by performing the secondary forming processing by the above processing device 2, so that the problem of cracking or slipping of the feature line during the forming process can be avoided.

The sharpened feature line 12 may be a side fascia of the vehicle body, or the sharpened feature line 12 may be provided in the front and rear wheel cover areas, the front and rear cover areas.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A method of feature line processing, comprising:

performing one-time forming processing on a workpiece so as to form passivation characteristic lines on the workpiece;

performing secondary forming processing on the workpiece with the passivation characteristic line to process the passivation characteristic line into a sharpened characteristic line;

and the chord length of the passivation characteristic line is larger than that of the sharpening characteristic line in the section of the same position of the workpiece.

2. The method of claim 1, wherein the passivation feature line is a curved structure with a continuous curvature.

3. The method of claim 1, wherein the passivation feature line is in an equal chord length form or a gradual chord length form along a length direction of the passivation feature line, and the sharpening feature line is identical to a chord length variation of the passivation feature line.

4. The feature line processing method according to claim 1, wherein a variation amount between vertices of the passivation feature line and the sharpening feature line is x, which satisfies: x is more than 0mm and less than or equal to 1mm.

5. The method according to claim 1, wherein the method comprises a trimming step one, a trimming step two, and a shaping step;

wherein the first trimming step is incorporated into the second trimming step; or alternatively, the first and second heat exchangers may be,

the forming process is integrated into the trimming process I; or alternatively, the first and second heat exchangers may be,

the first trimming step is incorporated into the second trimming step.

6. A feature line processing apparatus adapted to perform a secondary forming process on a workpiece having a passivated feature line to form the workpiece into a sharpened feature line;

the characteristic line machining device comprises a shaping cutter and a die which are oppositely arranged, wherein pressing plates are arranged on two opposite sides of the shaping cutter, and the pressing plates can tightly press the workpiece to the die.

7. The feature line processing apparatus according to claim 6, wherein a distance a between one end of the shaping tool and the sharpened feature line end is set to satisfy: a is more than or equal to 10mm.

8. The feature line processing apparatus of claim 6, wherein the pressing plate has a strong pressing area, one end of the strong pressing area is an end of the pressing plate near the shaping tool, and a width of the strong pressing area is b, where: b is more than or equal to 30mm.

9. The feature line processing apparatus according to claim 6, wherein a parting line gap between the shaping tool and the platen is c, satisfying: c is less than or equal to 0.3mm.

10. A housing structure provided with the characteristic line processed by the processing method according to any one of claims 1 to 5.