Punching die for C-shaped opening of front lower control arm and trimming method thereof

Abstract

The present invention provides a trimming die and trimming method for the C-shaped opening of a front lower control arm. The trimming die includes a lower die and an upper die. The lower die includes a lower die seat, a die wedge mechanism, a trimming punch and a punch wedge mechanism. The die wedge mechanism and the punch wedge mechanism are respectively slidably mounted on the lower die seat. An installation space is formed between the die wedge mechanism and the punch wedge mechanism. The first arm portion of the front lower control arm is mounted in the installation space, and the trimming punch is inserted into the C-shaped opening of the first arm portion; the second arm portion of the front lower control arm is mounted in the notch of the die wedge mechanism, and the front lower control arm is mounted across the die wedge mechanism; the punch drive block drives the punch wedge mechanism to move, so that the trimming punch trims the C-shaped opening of the front lower control arm from the inside to the outside. The present invention can ensure that the C-shaped opening can be completed after only one trimming, improve the dimensional accuracy of the C-shaped opening, and improve efficiency. The trimmed C-shaped opening is burr-free and consistent with the digital model.

Description

Technical Field

[0001] The invention relates to the field of C-shaped opening trimming, and in particular to a trimming die for a C-shaped opening of a front lower control arm and a trimming method thereof. Background Art

[0002] In the existing technology, the single-piece front lower control arm is one of the core parts of the most commonly used McPherson suspension in mainstream models. It is stamped from ultra-high-strength steel plates. Due to the needs of spatial layout, this type of part has unique geometric characteristics: the C-shaped mouth has a unique shape and high size requirements.

[0003] Figure 1 It is a structural schematic diagram of a front lower control arm in the prior art.

[0004] like Figure 1 As shown, the front lower control arm has two C-shaped openings 10. Currently, the C-shaped openings 10 are usually stamped by conventional means. It is difficult to ensure that the trimming insert has sufficient strength while ensuring the dimensional accuracy of the C-shaped openings. Therefore, it is impossible to ensure the life of the trimming insert and the trimming quality of the stamped parts at the same time.

[0005] Figure 2 Schematic diagram of the C-shaped mouth trimming method in the prior art Figure 1 . Figure 3 Schematic diagram of the C-shaped mouth trimming method in the prior art Figure 2 .

[0006] like Figure 2 and Figure 3 As shown, the conventional C-shaped edge trimming method uses two steps of trimming from the outside of the part to the inside of the part. Figure 2 It represents the first trimming, using the trimming punch 23, moving along the punch movement direction A, to perform the first trimming on the C-shaped mouth 10. Figure 3 It represents the second trimming, using the trimming punch 23, moving along the punch movement direction A, to perform the second trimming on the C-shaped mouth 10.

[0007] Figure 4 It is a schematic diagram of burrs after C-shaped mouth trimming in the prior art.

[0008] like Figure 4 As shown, the trimming angles of the two side trimmings in this process are different, and there are notches and burrs at the joint of the process, that is, the burrs generated after two trimmings are 100, so the size and appearance requirements cannot be guaranteed.

[0009] At the same time, due to the limitation of part shape, the C-shaped mouth has a small space, the side trimming structure is difficult to set up, and the quality and stability of trimming cannot be guaranteed. In addition, the material strength of the part is high, the mold space is small, and the structure size and shape are limited, so the trimming edge of the C-shaped mouth is often damaged, and the maintenance cost is high.

[0010] In view of this, the inventor of the present application has designed a trimming method for processing a C-shaped mouth in order to overcome the above-mentioned technical problems. Summary of the invention

[0011] The technical problem to be solved by the present invention is to overcome the defects of the prior art such as the difficulty in setting up the side trimming structure of the C-shaped mouth and the inability to ensure the quality and stability of the trimming, and to provide a trimming method for processing the C-shaped mouth.

[0012] The present invention solves the above technical problems through the following technical solutions:

[0013] A trimming die for a C-shaped opening of a front lower control arm comprises a lower die and an upper die, wherein the lower die comprises a lower die seat, a female die cam mechanism, a trimming punch and a punch cam mechanism, the female die cam mechanism and the punch cam mechanism are respectively slidably mounted on the lower die seat, an installation space is formed between the female die cam mechanism and the punch cam mechanism, a first arm portion of the front lower control arm to be processed is mounted in the installation space, the trimming punch is mounted on the inner wall surface of the punch cam mechanism, and the trimming punch is inserted into the C-shaped opening of the first arm portion;

[0014] A notch is provided on the upper portion of the die cam mechanism, and the second arm portion of the front lower control arm is installed in the notch, so that the front lower control arm is installed across the die cam mechanism;

[0015] The upper die includes an upper die seat, a die driving block and a punch driving block. When the upper die is matched with the lower die, the die driving block cooperates with the die angular wedge mechanism to drive the die angular wedge mechanism to move, and the punch driving block cooperates with the punch angular wedge mechanism to drive the punch angular wedge mechanism to move, so that the trimming punch trims the C-shaped opening of the front lower control arm from the inside to the outside.

[0016] According to one embodiment of the present invention, at least one inclined first driving surface is respectively provided at both ends of one side of the die inclined wedge mechanism, the die driving block matches the first driving surface, and the die inclined wedge mechanism moves through the driving force between the die driving block and the first driving surface.

[0017] According to an embodiment of the present invention, the first driving surface is located on both sides of the recess.

[0018] According to an embodiment of the present invention, the width of the recess is greater than the width of the second arm portion, and a gap is left between the inner wall surface of the side of the recess and the second arm portion.

[0019] According to one embodiment of the present invention, at least one guide rail is provided on the lower die base, at least one guide rail slot is provided at the bottom end of the die wedge mechanism, and the die wedge mechanism is installed on the guide rail via the guide rail slot.

[0020] According to one embodiment of the present invention, a trimming groove is provided on the wall surface of the die wedge mechanism opposite to the first arm portion, and the trimming groove matches the shape of the first arm portion and is used to fix the position of the first arm portion.

[0021] According to one embodiment of the present invention, the outer side surface of the punch wedge mechanism is provided with at least one inclined second driving surface, the punch driving block and the second driving surface match each other, and the punch wedge mechanism is moved by the driving force between the punch driving block and the second driving surface.

[0022] According to one embodiment of the present invention, the trimming punch comprises a base and a blade, and the blade is mounted on the base by additive manufacturing.

[0023] According to an embodiment of the present invention, the end of the blade portion is an arc surface.

[0024] The present invention also provides a trimming method for a C-shaped opening of a front lower control arm, wherein the trimming method adopts the trimming die for the C-shaped opening of the front lower control arm as described above, and the trimming method comprises the following steps:

[0025] S 1 , placing the front lower control arm with the C-shaped opening to be processed into the lower die of the punching die, the first arm portion with the C-shaped opening on the front lower control arm is located in the installation space between the female die cam mechanism and the male die cam mechanism of the lower die, and the second arm portion of the front lower control arm is installed in the notch of the female die cam mechanism, so that the front lower control arm is installed across the female die cam mechanism;

[0026] S 2 , the press moves downward, so that the upper die of the repair punching die moves downward as a whole, pressing the front lower control arm;

[0027] S 3 , the die driving block of the upper die contacts and cooperates with the die cam mechanism in the lower die, driving the die cam mechanism to slide close to and press the first arm portion with the C-shaped opening on the front lower control arm;

[0028] S 4 , the punch driving block of the upper die contacts and cooperates with the punch wedge mechanism in the lower die, driving the punch wedge mechanism to slide close to the front lower control arm, and the C-shaped opening is trimmed by the trimming punch provided on the punch wedge mechanism;

[0029] S 5 , the press moves upward, the upper die is separated from the lower die, and the front lower control arm is taken out.

[0030] According to one embodiment of the present invention, the step S 2 Specifically, the pressing plate in the upper die contacts with the front lower control arm and presses the front lower control arm.

[0031] According to one embodiment of the present invention, the pressure of the pressing plate is 12t.

[0032] According to one embodiment of the present invention, the step S 3 Specifically include:

[0033] S 31 , the driving surface of the die driving block contacts the driving surface of the die cam mechanism and slides relative to each other, so that the die cam mechanism slides along the guide rail of the lower die;

[0034] S 32 , the trimming groove of the die wedge mechanism is close to the C-shaped opening and keeps pressure.

[0035] According to one embodiment of the present invention, the step S 4 Specifically include:

[0036] S 41 , the driving surface of the punch driving block contacts the driving surface of the punch cam mechanism and slides relative to each other, so that the punch cam mechanism slides close to the C-shaped opening;

[0037] S 42 The trimming punch is installed on the punch wedge mechanism, and as the punch wedge mechanism moves, the trimming punch completes the trimming of the C-shaped mouth.

[0038] According to one embodiment of the present invention, the step S 5 Specifically include:

[0039] S 51 , the press moves upward, the driving surface of the punch driving block is separated from the driving surface of the punch wedge mechanism, and the punch wedge mechanism retreats to the initial installation position under the action of its own force source;

[0040] S 52 , the driving surface of the die driving block is separated from the driving surface of the die cam mechanism, and the die cam mechanism retreats to the initial installation position under the action of its own force source;

[0041] S 53, the pressing plate of the upper die is separated from the surface of the front lower control arm, and the front lower control arm is removed from the trimming die.

[0042] According to one embodiment of the present invention, the step S 1 The distance between the female die angled wedge mechanism and the male die angled wedge mechanism is greater than 70 mm before trimming.

[0043] According to one embodiment of the present invention, the step S 4 The distance between the female die angled wedge mechanism and the male die angled wedge mechanism is greater than or equal to 20 mm during trimming.

[0044] The positive and progressive effects of the present invention are:

[0045] The trimming die for the C-shaped opening of the front lower control arm of the present invention can ensure that the C-shaped opening can be completed after only one trimming, which can not only improve the dimensional accuracy of the C-shaped opening, but also improve the efficiency. The C-shaped opening after trimming by the trimming die has no burrs and is consistent with the digital model. At the same time, the trimming die adopts new materials to effectively reduce the maintenance cost of the die, while obtaining good size and appearance.

[0046] The trimming method for the C-shaped opening of the front lower control arm of the present invention can ensure that the C-shaped opening can be completed by trimming once, which can improve the dimensional accuracy of the C-shaped opening and improve the efficiency. By using the trimming method for processing the C-shaped opening, there is no notch or burr on the C-shaped opening after trimming and punching, which is consistent with the digital model. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0048] Figure 1 It is a structural schematic diagram of a front lower control arm in the prior art.

[0049] Figure 2 Schematic diagram of the C-shaped mouth trimming method in the prior art Figure 1 .

[0050] Figure 3 Schematic diagram of the C-shaped mouth trimming method in the prior art Figure 2 .

[0051] Figure 4 It is a schematic diagram of burrs after C-shaped mouth trimming in the prior art.

[0052] Figure 5 The present invention is a stereoscopic view of the lower die in the punching die for the C-shaped opening of the front lower control arm.

[0053] Figure 6 The present invention is a stereoscopic view of an upper die in a punching die for repairing a C-shaped opening of a front lower control arm.

[0054] Figure 7 The invention is a three-dimensional diagram of the oblique wedge mechanism of the concave die in the punching die for the C-shaped opening of the front lower control arm. Figure 1 .

[0055] Figure 8 The invention is a three-dimensional diagram of the oblique wedge mechanism of the concave die in the punching die for the C-shaped opening of the front lower control arm. Figure 2 .

[0056] Fig. 9 The present invention is a stereoscopic view of a trimming punch in a trimming die for a C-shaped opening of a front lower control arm.

[0057] Fig.10 The figure is a schematic diagram of the use state of the punching die for the C-shaped opening of the front lower control arm according to the present invention.

[0058] Fig.11 The present invention is a flow chart of the trimming method for the C-shaped opening of the front lower control arm.

[0059] [Reference Signs]

[0060] Burr 100

[0061] C-type port 10, 43

[0062] Lower die 20

[0063] Upper mold 30

[0064] Front lower control arm 40

[0065] Lower die seat 21

[0066] Die wedge mechanism 22

[0067] Trimming punch 23

[0068] Punch wedge mechanism 24

[0069] Guide Rail 25

[0070] Installation space B

[0071] First arm portion 41

[0072] Second arm portion 42

[0073] Upper die seat 31

[0074] Die drive block 32

[0075] Punch drive block 33

[0076] Pressing plate 34

[0077] Notch 221

[0078] First driving surface 222

[0079] Guide rail chute 223

[0080] Trimming groove 224

[0081] Second driving surface 241

[0082] Matrix 231

[0083] Blade 232

[0084] Bonding wire 233 DETAILED DESCRIPTION

[0085] 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 with reference to the accompanying drawings.

[0086] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0087] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0088] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0089] Figure 5 The present invention is a stereoscopic view of the lower die in the punching die for the C-shaped opening of the front lower control arm. Figure 6 The present invention is a stereoscopic view of an upper die in a punching die for repairing a C-shaped opening of a front lower control arm.

[0090] like Figure 5 and Figure 6As shown, the present invention discloses a trimming die for the C-shaped opening of the front lower control arm, including a lower die 20 and an upper die 30. The lower die 20 includes a lower die seat 21, a die cam mechanism 22, a trimming punch 23 and a punch cam mechanism 24, and the die cam mechanism 22 and the punch cam mechanism 24 are respectively slidably mounted on the lower die seat 21. An installation space B is formed between the die cam mechanism 22 and the punch cam mechanism 24, and the first arm portion 41 of the front lower control arm 40 to be processed is mounted in the installation space B, and the trimming punch 23 is mounted on the inner wall surface of the punch cam mechanism 24, and the trimming punch 23 enters and exits the C-shaped opening 43 of the first arm portion 41. A notch 221 is provided on the upper part of the die cam mechanism 22, and the second arm portion 42 of the front lower control arm 40 is mounted in the notch 221, so that the front lower control arm 40 is mounted across the die cam mechanism 22.

[0091] The upper die 30 includes an upper die base 31, a die driving block 32 and a punch driving block 33. When the upper die 30 is matched with the lower die 20, the die driving block 32 cooperates with the die angled wedge mechanism 22 to drive the die angled wedge mechanism 22 to move, and the punch driving block 33 cooperates with the punch angled wedge mechanism 24 to drive the punch angled wedge mechanism 24 to move, so that the trimming punch 23 trims the C-shaped opening 43 of the front lower control arm 40 from the inside to the outside.

[0092] Before and after trimming of the C-shaped opening, the trimming punch 23 is located between the two C-shaped openings of the part, that is, during the trimming process, the trimming punch 23 moves from the inside of the part to the outside of the part to complete the trimming.

[0093] In addition, a pressing plate 34 may be provided on the upper mold 30 . When the upper mold 30 and the lower mold 20 are closed, the pressing plate 24 is used to press the part to be processed, such as the front lower control arm 40 .

[0094] Here, the width of the installation space B (i.e., the space formed between the die bevel wedge mechanism 22 and the punch bevel wedge mechanism 24) is the minimum distance between the die bevel wedge mechanism 22 and the punch bevel wedge mechanism 24, which should be greater than 70 mm before trimming (i.e., the strokes of the die bevel wedge mechanism 22 and the punch bevel wedge mechanism 24 are both 0) to ensure that the insertion and removal process of the front lower control arm 40 is normal.

[0095] During trimming (ie the strokes of the die cam mechanism 22 and the punch cam mechanism 24 reach the maximum), the minimum distance between the die cam mechanism 22 and the punch cam mechanism 24 should be greater than or equal to 20 mm.

[0096] Figure 7 The invention is a three-dimensional diagram of the oblique wedge mechanism of the concave die in the punching die for the C-shaped opening of the front lower control arm. Figure 1 . Figure 8 The invention is a three-dimensional diagram of the oblique wedge mechanism of the concave die in the punching die for the C-shaped opening of the front lower control arm. Figure 2 .

[0097] like Figure 7 and Figure 8 As shown, preferably, at least one inclined first driving surface 222 is respectively provided at both ends of one side of the die inclined wedge mechanism 22, and the die driving block 32 matches the first driving surface 222, and the die inclined wedge mechanism 22 moves through the driving force between the die driving block 32 and the first driving surface 222.

[0098] Preferably, the first driving surfaces 222 are located on both sides of the notch 221 .

[0099] In particular, the width of the recess 221 is greater than the width of the second arm portion 42 , and a gap is left between the inner wall surface of the side of the recess 221 and the second arm portion 42 .

[0100] That is, the size of the notch 221 is larger than the part (for example, larger than 200 mm), and can completely cross the part and completely avoid the part during the movement without contacting the part. The part here is, for example, a front lower control arm.

[0101] The structure of the die wedge mechanism 22 is designed to cross the part because of the limitation of the shape of the part itself. A structure of sufficient size cannot be arranged on the same side of the part. Therefore, the structure of the die wedge mechanism 22 that crosses the part is an important part of the method for repairing and punching the C-shaped mouth.

[0102] Furthermore, at least one guide rail 25 is provided on the lower die base 21, and at least one guide rail slot 223 is provided at the bottom end of the die cam mechanism 22. The die cam mechanism 22 is installed on the guide rail 25 through the guide rail slot 223. In this way, the die cam mechanism 22 can only move in the direction limited by the guide rail 25 (for example, along the Figure 7 Movement in the direction of the arrow shown), movement in other directions is restricted and the error is less than 0.05mm.

[0103] Similarly, the punch wedge mechanism 24 can also be slidably connected to the lower die base 21 via a guide rail.

[0104] In addition, a trimming groove 224 is provided on the wall surface of the die wedge mechanism 22 opposite to the first arm portion 41 of the front lower control arm 40 . The trimming groove 224 matches the shape of the first arm portion 41 and is used to fix the position of the first arm portion 41 .

[0105] like Figure 5 and Figure 6As shown, preferably, at least one inclined second driving surface 241 is provided on the outer side surface of the punch wedge mechanism 24, and the punch driving block 33 and the second driving surface 241 are matched with each other, and the punch wedge mechanism 24 is moved by the driving force between the punch driving block 33 and the second driving surface 241.

[0106] Fig. 9 The present invention is a stereoscopic view of a trimming punch in a trimming die for a C-shaped opening of a front lower control arm.

[0107] like Fig. 9 As shown, preferably, the trimming punch 23 includes a base 231 and a blade 232, and the blade 232 is mounted on the base 231 by additive manufacturing. The end of the blade 232 is preferably an arc surface.

[0108] Specifically, since the design space of the trimming punch 23 is strictly limited, it is necessary to ensure that the trimming edge has sufficient hardness while ensuring that the punch has sufficient toughness. Therefore, the trimming punch 23 is made by additive manufacturing. The blade 232 of the trimming punch 23 is made of a special material, and the area in contact with the workpiece is attached to the substrate 231 with good toughness using a 3D-printed high-strength alloy, which ensures both the shear strength of the blade and sufficient toughness, greatly improving the life of the trimming punch. At the junction of the blade 232 and the substrate 231, the shape of the joint line 233 is a quadratic curve to ensure the reliability of the performance of the joint.

[0109] The front lower control arm made of high-strength steel is used in many car models. This trimming method can simplify the trimming process of the C-shaped mouth and improve production efficiency. The application of new materials can effectively reduce the mold maintenance cost while achieving good size and appearance.

[0110] Fig.10 The figure is a schematic diagram of the use state of the punching die for the C-shaped opening of the front lower control arm according to the present invention.

[0111] like Fig.10 As shown in the figure, the trimming die for C-shaped mouth processing of the present invention adopts a die wedge mechanism, which allows the die wedge mechanism to pass through the lower part of the part to be processed. This structure solves the problem that there is insufficient space on the left side of the C-shaped mouth 43 to set the wedge. When trimming the C-shaped mouth 43, the trimming die 224 is pushed by the die wedge structure 22 to move along the Figure 7 Move to the right in the direction of the arrow shown in the figure, and press the C-shaped opening 41. The trimming punch 23 moves along Figure 7 The trimming is performed by moving to the left in the direction of the arrow shown in the figure. After the trimming, the trimming punch 23 first retreats to the right. The trimming die 224 retreats under the drive of the die wedge structure 22 to complete the trimming of the C-shaped opening 43.

[0112] The trimming die for the C-shaped opening of the front lower control arm can ensure that the C-shaped opening can be completed after only one trimming, which can not only improve the dimensional accuracy of the C-shaped opening, but also improve efficiency. After the trimming die is used, there is no notch or burr on the C-shaped opening, which is consistent with the digital model.

[0113] In summary, the trimming die for the C-shaped opening of the front lower control arm of the present invention can ensure that the C-shaped opening can be completed after only one trimming, which can not only improve the dimensional accuracy of the C-shaped opening, but also improve efficiency. The C-shaped opening after trimming by the trimming die has no burrs and is consistent with the digital model.

[0114] At the same time, the use of new materials in the repair punching die can effectively reduce the maintenance cost of the die, while achieving good size and appearance.

[0115] Fig.11 The present invention is a flow chart of the trimming method for the C-shaped opening of the front lower control arm.

[0116] like Fig.11 As shown, the present invention also discloses a trimming method for the C-shaped opening of the front lower control arm, using the trimming die for the C-shaped opening of the front lower control arm, and the trimming method comprises the following steps:

[0117] Step S 1 , place the front lower control arm 40 with a C-shaped opening to be processed into the lower die 20 of the punching die, and the first arm portion 41 with the C-shaped opening 43 on the front lower control arm 40 is located in the installation space B between the die cam mechanism 22 and the punch cam mechanism 24 of the lower die 20, so that the front lower control arm 40 is installed across the die cam mechanism 22.

[0118] The distance between the die cam mechanism 22 and the punch cam mechanism 24 is greater than 70 mm before trimming.

[0119] Step S 2 , the press moves downward, causing the upper die 30 of the repair die to move downward as a whole, pressing the front lower control arm 40.

[0120] Preferably, the step S 2 The method may further specifically include: the pressing plate 34 in the upper die 30 contacts the front lower control arm 40 and presses the front lower control arm 40 .

[0121] In this embodiment, the pressure of the pressing plate 210 is preferably 12t.

[0122] Step S 3 The die driving block 32 of the upper die 30 contacts and cooperates with the die wedge mechanism 22 in the lower die 20 , driving the die wedge mechanism 22 to slide close to and press the first arm portion 41 with the C-shaped opening 43 on the front lower control arm 40 .

[0123] Preferably, the step S 3 It may also specifically include:

[0124] S 31 The driving surface of the die driving block 32 contacts the driving surface of the die cam mechanism 22 and slides relative to each other, so that the die cam mechanism 22 slides along the guide rail 25 of the lower die 20 (e.g., along the guide rail 25 of the lower die 20). Fig.10 The middle arrow direction moves to the right).

[0125] S 32 The trimming groove 224 of the die wedge mechanism 22 is pressed against the C-shaped opening 43 and keeps the pressure.

[0126] Specifically, the trimming die 224 is pushed by the die wedge mechanism 22 to move along the Fig.10 The middle arrow direction moves to the right, and when the stroke of the die wedge mechanism 224 reaches the maximum, the trimming die 224 is close to the C-shaped opening 43 and maintains a certain pressure.

[0127] Step S 4 The punch driving block 33 of the upper die 30 contacts and cooperates with the punch wedge mechanism 24 in the lower die 20 , driving the punch wedge mechanism 24 to slide close to the front lower control arm 40 , and the C-shaped opening 43 is trimmed by the trimming punch 23 arranged on the punch wedge mechanism 24 .

[0128] Preferably, the step S 4 It may also specifically include:

[0129] S 41 The driving surface of the punch driving block 33 contacts the driving surface of the punch wedge mechanism 24 and slides relative to each other, so that the punch wedge mechanism 24 slides close to the C-shaped opening 43 (such as along the Fig.10 The middle arrow direction moves to the left).

[0130] S 42 The trimming punch 23 is installed on the punch wedge mechanism 24 . With the movement of the punch wedge mechanism 24 , the trimming punch 23 completes the trimming of the C-shaped opening 43 .

[0131] When the stroke of the punch wedge structure reaches the maximum, the trimming of the C-shaped opening 43 is completed.

[0132] The distance between the female die angled wedge mechanism 22 and the male die angled wedge mechanism 24 is greater than or equal to 20 mm during trimming.

[0133] Step S 5 , the press moves upward, the upper die 30 is separated from the lower die 20, and the front lower control arm 40 is taken out.

[0134] Preferably, the step S 5It may also specifically include:

[0135] S 51 , the press moves upward, the driving surface of the punch driving block 33 is separated from the driving surface of the punch wedge mechanism 24, and the punch wedge mechanism 24 retreats to the initial installation position (i.e., the position where the stroke of the punch wedge mechanism 24 is 0) under the action of its own force source;

[0136] S 52 , the driving surface of the die driving block 32 is separated from the driving surface of the die cam mechanism 22, and the die cam mechanism 22 retreats to the initial installation position (i.e., the position where the stroke of the die cam mechanism 22 is 0) under the action of its own force source;

[0137] At this time, the trimming groove 224 is separated from the front lower control arm 40 .

[0138] S 53 , the pressing plate 34 of the upper die 30 is separated from the surface of the front lower control arm 40, and the front lower control arm 40 is removed from the trimming die.

[0139] In addition, preferably, the blade of the trimming punch 23 is made of tungsten carbide, titanium alloy, titanium-based composite material, iron-based composite material and metal-based ceramic material.

[0140] The trimming method for processing a C-shaped mouth of the present invention can ensure that the C-shaped mouth can be completed by trimming once, which can improve the dimensional accuracy of the C-shaped mouth and improve efficiency. By using the trimming method for processing a C-shaped mouth, there is no notch or burr on the C-shaped mouth after trimming and punching, which is consistent with the digital model.

[0141] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A punching die for a C-shaped opening of a front lower control arm, comprising a lower die and an upper die, characterized in that: The lower die comprises a lower die seat, a female die cam mechanism, a trimming punch and a punch cam mechanism, the female die cam mechanism and the punch cam mechanism are respectively slidably mounted on the lower die seat, an installation space is formed between the female die cam mechanism and the punch cam mechanism, a first arm portion of the front lower control arm to be processed is mounted in the installation space, the trimming punch is mounted on the inner wall surface of the punch cam mechanism, and the trimming punch is inserted into the C-shaped opening of the first arm portion; A notch is provided on the upper portion of the die cam mechanism, and the second arm portion of the front lower control arm is installed in the notch, so that the front lower control arm is installed across the die cam mechanism; The upper die includes an upper die seat, a die driving block and a punch driving block. When the upper die is matched with the lower die, the die driving block cooperates with the die angular wedge mechanism to drive the die angular wedge mechanism to move, and the punch driving block cooperates with the punch angular wedge mechanism to drive the punch angular wedge mechanism to move, so that the trimming punch trims the C-shaped opening of the front lower control arm from the inside to the outside.

2. The punching die for the C-shaped opening of the front lower control arm according to claim 1, characterized in that: At least one inclined first driving surface is respectively provided at both ends of one side of the die inclined wedge mechanism, and the die driving block matches the first driving surface. The die inclined wedge mechanism moves through the driving force between the die driving block and the first driving surface.

3. The punching die for the C-shaped opening of the front lower control arm according to claim 2, characterized in that: The first driving surface is located on both sides of the recess.

4. The punching die for the C-shaped opening of the front lower control arm according to claim 3, characterized in that: The width of the notch is greater than the width of the second arm portion, and a gap is left between the inner wall surface of the side of the notch and the second arm portion.

5. The punching die for the C-shaped opening of the front lower control arm according to claim 1, characterized in that: At least one guide rail is arranged on the lower die base, at least one guide rail slot is arranged at the bottom end of the die cam mechanism, and the die cam mechanism is installed on the guide rail via the guide rail slot.

6. The punching die for the C-shaped opening of the front lower control arm according to claim 2, characterized in that: A trimming groove is provided on the wall surface of the die wedge mechanism opposite to the first arm portion, and the trimming groove matches the shape of the first arm portion and is used to fix the position of the first arm portion.

7. The punching die for the C-shaped opening of the front lower control arm according to claim 1, characterized in that: The outer side surface of the punch wedge mechanism is provided with at least one inclined second driving surface, and the punch driving block matches the second driving surface. The punch wedge mechanism moves through the driving force between the punch driving block and the second driving surface.

8. The punching die for the C-shaped opening of the front lower control arm according to claim 1, characterized in that: The trimming punch comprises a base and a blade, and the blade is mounted on the base by additive manufacturing.

9. The punching die for the C-shaped opening of the front lower control arm according to claim 8, characterized in that: The end of the blade is an arc surface.

10. A method for trimming a C-shaped opening of a front lower control arm, characterized in that: The trimming method adopts the trimming die for the C-shaped opening of the front lower control arm as described in any one of claims 1 to 9 above, and the trimming method comprises the following steps: S1, placing the front lower control arm with a C-shaped opening to be processed into the lower die of the punching die, the first arm portion with the C-shaped opening on the front lower control arm is located in the installation space between the female die cam mechanism and the male die cam mechanism of the lower die, and the second arm portion of the front lower control arm is installed in the notch of the female die cam mechanism, so that the front lower control arm is installed across the female die cam mechanism; S2, the press moves downward, so that the upper die of the repair punching die moves downward as a whole, pressing the front lower control arm; S3, the die driving block of the upper die contacts and cooperates with the die cam mechanism in the lower die, driving the die cam mechanism to slide close to and press the first arm portion with the C-shaped opening on the front lower control arm; S4, the punch driving block of the upper die contacts and cooperates with the punch wedge mechanism in the lower die, driving the punch wedge mechanism to slide close to the front lower control arm, and trimming the C-shaped opening by the trimming punch provided on the punch wedge mechanism; S5. The press moves upward, the upper die is separated from the lower die, and the front lower control arm is taken out.

11. The trimming method for the C-shaped opening of the front lower control arm according to claim 10, characterized in that: The step S2 specifically includes: a blank holder in the upper die contacts the front lower control arm and presses the front lower control arm.

12. The method for trimming the C-shaped opening of the front lower control arm according to claim 11, characterized in that: The pressure of the pressing plate is 12t.

13. The method for trimming the C-shaped opening of the front lower control arm according to claim 10, characterized in that: The step S3 specifically includes: S 31 , the driving surface of the die driving block contacts the driving surface of the die cam mechanism and slides relative to each other, so that the die cam mechanism slides along the guide rail of the lower die; S 32 , the trimming groove of the die wedge mechanism is close to the C-shaped opening and keeps pressure.

14. The method for trimming the C-shaped opening of the front lower control arm according to claim 10, characterized in that: The step S4 specifically includes: S 41 , the driving surface of the punch driving block contacts the driving surface of the punch cam mechanism and slides relative to each other, so that the punch cam mechanism slides close to the C-shaped opening; S 42 The trimming punch is installed on the punch wedge mechanism, and as the punch wedge mechanism moves, the trimming punch completes the trimming of the C-shaped mouth.

15. The trimming method for the C-shaped opening of the front lower control arm according to claim 10, characterized in that: The step S5 specifically includes: S 51 , the press moves upward, the driving surface of the punch driving block is separated from the driving surface of the punch wedge mechanism, and the punch wedge mechanism retreats to the initial installation position under the action of its own force source; S 52 , the driving surface of the die driving block is separated from the driving surface of the die cam mechanism, and the die cam mechanism retreats to the initial installation position under the action of its own force source; S 53 , the pressing plate of the upper die is separated from the surface of the front lower control arm, and the front lower control arm is removed from the trimming die.

16. The method for trimming the C-shaped opening of the front lower control arm according to claim 10, characterized in that: In the step S1, the distance between the female die cam mechanism and the male die cam mechanism is greater than 70 mm before trimming.

17. The trimming method for the C-shaped opening of the front lower control arm according to claim 10, characterized in that: In the step S4, the distance between the female die angled wedge mechanism and the male die angled wedge mechanism is greater than or equal to 20 mm during trimming.

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