Forming device for multi-step part and multi-step part

Abstract

The present invention provides a forming device for multi-step parts and the multi-step parts. The multi-step parts at least include a flange portion, a first rod portion, a second rod portion, and a tail rod portion that are sequentially connected. The rod diameters of the first rod portion, the second rod portion, and the tail rod portion decrease in sequence. The forming device includes a cold heading machine and a feeding mechanism. A clamping replacement die is added between the forming die and the trimming die of the cold heading machine. After the first clamping jaw clamps the preset circular flange of the preset part and transfers it to the clamping replacement die, the second clamping jaw then clamps its first rod portion or second rod portion, and then transfers it to the trimming die for flange trimming to form the flange portion. After necessary processes such as thread rolling, heat treatment, electroplating, etc., the finished multi-step parts can be obtained. By adding a clamping replacement die, the forming device for the multi-step parts of the present invention converts the clamping position of the preset part, stably passes the die, realizes one-time cold heading and trimming, ensures the product quality, and improves the production efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of fastener forming, and particularly relates to a forming device for multi-step parts and multi-step parts. Background Art

[0002] A screw is a very common fastener. It is a tool that uses the physical and mathematical principles of the inclined plane circular rotation and friction of an object to gradually fasten machine parts of utensils. It is an indispensable industrial necessity in daily life: such as extremely small screws used in cameras, glasses, watches, electronics, etc.; general screws used in televisions, electrical appliances, musical instruments, furniture; large screws and nuts used in engineering, construction, bridges; and a combination of large and small screws is used in transportation appliances, airplanes, trams, cars, etc. Thus, it can be seen that screws play an important role in industry, so the output and quality of screws are crucial.

[0003] Among screws, there is a classification called stepped screws, which can be simply understood as non-standard screws with two or more steps. Regardless of the number of steps, they can be long or short. Long-step screws are easy to grip and pass through the die during cold heading production. However, for some short-step screws, due to the large number of steps, during the cold heading process, the effective length that can be gripped is very short. Especially when passing through the die from the forming station to the trimming station, when using a die-passing gripper to clamp and transfer the workpiece, it is very difficult to adjust the clamping and opening time. The production speed must be reduced significantly, otherwise, problems such as product dropping, trimming of the tail rod part, trimming deviation, damage to the die-passing gripper, and machine collision are likely to occur during production. As Figure 1 shown, after pre-forming a multi-step part, it needs to pass through the die for trimming. The pre-formed part at least includes a pre-set circular flange 11', a first rod part 12, a second rod part 13, and a tail rod part 14. Due to the influence of the axial length and radial width of each stepped rod, the thickness of the original gripper 7 can only be designed to be very thin. After the pre-set part is completely removed from the main die, the effective clamping length of the original gripper 7 for the second rod part 13 is only 2.0 mm. Due to the extremely short effective clamping length, it is very easy to drop the workpiece during production due to unstable die-passing clamping, and the trimming will be deviated. The production speed can only reach about 50 pieces per minute. In order to ensure the trimming quality, generally, a flange trimming operation is performed using a heading machine after cold heading forming. However, changing machines will undoubtedly also reduce production efficiency. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned prior art, the main purpose of the present invention is to provide a forming device for a multi-step part and a multi-step part. The multi-step part at least includes a flange portion, a first rod portion, a second rod portion and a tail rod portion connected in sequence, and the rod diameters of the first rod portion, the second rod portion and the tail rod portion decrease successively. The forming device adds a clamping die between the forming die and the trimming die of the original cold heading machine to change the clamping position of the preset part, increase the effective clamping length of the clamp, stabilize the preset part after being over-molded, ensure the trimming quality rate, and do not need the whole head machine to participate in the trimming work, thereby saving machine change time and improving production efficiency.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a forming device for a multi-step part, wherein the multi-step part at least comprises a flange part, a first rod part, a second rod part and a tail rod part which are connected in sequence, and the rod diameters of the first rod part, the second rod part and the tail rod part are successively reduced, and the forming device for the multi-step part comprises a cold heading machine provided with a plurality of forming dies, a clamping die, and a trimming die, and a feeding mechanism for feeding between the plurality of dies, wherein the feeding mechanism comprises a first feeding assembly and a second feeding assembly;

[0007] The plurality of forming dies cooperate together to form the preset blank into a preset circular flange, a first rod portion, a second rod portion and a tail rod portion to obtain a preset part;

[0008] The clamp-changing mold is used to replace the feeding clamp clamping the preset part, so that the first feeding component clamped on the preset circular flange is replaced with the second feeding component clamped on the first rod part or the second rod part;

[0009] The trimming die is used to perform flange trimming on the preset part after the feed clamp is replaced, so that the preset circular flange is formed into the flange part;

[0010] Among them, the first feeding component includes at least two first clamping jaws arranged opposite to each other, the first clamping jaws include a first clamping portion fitted with the side of the preset circular flange, and a second clamping portion fitted with the end face of the preset circular flange away from the first rod portion; a first clamping space adapted to the preset circular flange is formed between the opposite first clamping portions, and the opposite second clamping portions jointly form a stop platform adapted to the end face; the second feeding component includes at least two second clamping jaws arranged opposite to each other, the second clamping jaws include a third clamping portion fitted with the side of the second rod portion, and a second clamping space adapted to the first rod portion or the second rod portion is formed between the opposite third clamping portions.

[0011] As a further description of the above technical solution, the forming die, the clamping die and the trimming die all include a main die and a punch die that are arranged accordingly;

[0012] The main mold comprises a main mold shell, a main mold cushion block, a main mold ejector pin and a main mold core arranged in the main mold shell, the main mold core has a main mold cavity with an opening facing the punching die, and the main mold ejector pin is arranged through the main mold cushion block;

[0013] The die comprises a die shell, a die pad and a die ejector arranged in the die shell, one end of the die ejector is connected to the die pad, and the other end of the die ejector passes through the die shell and faces the main die cavity.

[0014] As a further description of the above technical solution, the main mold cavity of the clamp-changing mold is a straight section cavity, and the inner diameter of the straight section cavity is adapted to the rod diameter of the second rod part, or,

[0015] The inner diameter of the straight section cavity is matched with the rod diameter of the tail rod part.

[0016] As a further description of the above technical solution, a die sleeve is further provided in the die pad of the clamp changing die and the trimming die, and one end of the die ejector pin is connected to the die spring in the die sleeve.

[0017] As a further description of the above technical solution, when the preset part is demolded from a forming mold adjacent to the clamping mold, the first clamping space is opposite to the main mold cavity of the forming mold.

[0018] As a further description of the above technical solution, the stop platform has an avoidance portion, and the avoidance portion is formed by an inward depression of the second clamping portion relative to the second clamping portion.

[0019] As a further description of the above technical solution, both the first clamping portion and the third clamping portion are arc-shaped surfaces, and in the clamping state, the arc-shaped surfaces form surface contact with the side surface of the preset component.

[0020] As a further description of the above technical solution, it also includes a shearing mechanism, which is used to cut the wire into the preset blanks.

[0021] The present invention also provides a multi-step part, characterized in that it includes a flange portion, a first rod portion, and a second rod portion connected in sequence, and the rod diameters of the first rod portion, the second rod portion, and the tail rod portion decrease in sequence, and the second rod portion is formed with a thread.

[0022] As a further description of the above technical solution, one end of the flange portion facing away from the first rod portion is also connected to a head rod portion.

[0023] In summary, the outstanding effects of the present invention are:

[0024] The forming device for multi-step parts of the present invention adds a clamping replacement die between the forming die and the trimming die of the original cold heading machine, and replaces the original clamping jaw that passed the die between the forming die and the trimming die with a combination of a first clamping jaw and a second clamping jaw, performing a conversion of the clamping position of the preset part once, thereby greatly increasing the effective clamping length of the preset part. The clamping stability of both clamping jaws is higher than that of the original clamping jaw, thus ensuring the die passing stability of the preset part from the forming die to the trimming die, without considering material dropping during die passing. After die passing, the trimming is not skewed or chipped, thereby ensuring the product yield while increasing the die passing rate, and also eliminating the need for a whole-head machine to participate in the flange trimming operation, saving the machine change time and greatly improving the production efficiency. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 Schematic diagram of the multi-step part coming out of the forming die in the prior art;

[0027] Figure 2 Schematic diagram of the multi-step part coming out of the forming die in the embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the multi-step part in the embodiment of the present invention in the state of being clamped by the second clamping jaw in the clamping replacement die;

[0029] Figure 4 Schematic diagram of the structure of the multi-step part after cold heading and trimming in the embodiment of the present invention;

[0030] Figure 5 Top view of the multi-step part after cold heading and trimming in the embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the multi-step part in another embodiment of the present invention in the state of being in the clamping replacement die;

[0032] Explanation of the reference numerals in the drawings:

[0033] 11. Flange part; 12. First rod part; 13. Second rod part; 14. Tail rod part; 15. Head rod part;

[0034] 11’. Preset circular flange;

[0035] 2. Forming die;

[0036] 3. Clamping replacement die;

[0037] 4. The first clamping jaw; 41. The first clamping part; 42. The second clamping part; 43. The avoidance part;

[0038] 5. The second clamping jaw; 51. The third clamping part;

[0039] 6. The main mold; 61. The main mold core;

[0040] 7. The original clamping jaw. Specific implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "middle", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Next, a specific description will be given in conjunction with the attached Figure 1 to the attached Figure 6 and the embodiments.

[0044] This embodiment provides a forming device for multi-step parts. The multi-step parts at least include a flange portion 11, a first rod portion 12, a second rod portion 13, and a tail rod portion 14 that are sequentially connected. The rod diameters of the first rod portion 12, the second rod portion 13, and the tail rod portion 14 decrease in sequence. The forming device for the multi-step parts includes a cold heading machine provided with a plurality of forming dies 2, a clamping die replacement die 3, and a trimming die (not shown in the figure), and a feeding mechanism for feeding between the plurality of dies. The feeding mechanism includes a first feeding component and a second feeding component;

[0045] The plurality of forming dies 2 cooperate together to form a preset blank into a preset round flange 11', a first rod portion 12, a second rod portion 13, and a tail rod portion 14 to obtain a preset part;

[0046] The clamp-changing mold 3 is used to replace the feeding clamp clamping the preset part, so that the first feeding assembly clamped on the preset circular flange 11' is replaced with the second feeding assembly clamped on the first rod 12 or the second rod 13;

[0047] The trimming die is used to perform flange trimming on the preset part after the feed clamp is replaced, so that the preset circular flange 11' is formed into the flange part 11;

[0048] Among them, the first feeding component includes at least two oppositely arranged first clamping jaws 4, the first clamping jaws 4 include a first clamping portion 41 fitted with the side of the preset circular flange 11', and a second clamping portion 42 fitted with the end face of the preset circular flange 11' away from the first rod portion 12; a first clamping space adapted to the preset circular flange 11' is formed between the opposite first clamping portions 41, and the opposite second clamping portions 42 jointly form a stop platform adapted to the end face; the second feeding component includes at least two oppositely arranged second clamping jaws 5, the second clamping jaws 5 include a third clamping portion 51 fitted with the side of the second rod portion 13, and a second clamping space adapted to the first rod portion 12 or the second rod portion 13 is formed between the opposite third clamping portions 51.

[0049] By means of the above structure, a multi-station cold heading machine is used for processing, and the preset blank is subjected to multi-die multi-punching, and cold heading trimming is performed in the last die. The production speed can reach 90 pieces per minute. The operator can first use the multiple forming dies 2 located in front of the clamping die 3 to form the preset blank formed by cutting the wire into the preset part. The preset part includes a preset circular flange 11', and a first rod 12, a second rod 13 and a tail rod 14 sequentially connected to the preset circular flange 11'. The feeding mechanism of the multiple forming dies 2 can use a conventional feeding mechanism. After the preset part is formed, the first feeding component is used to transfer it to the clamping die 3, and then the second feeding component is used to transfer it to the trimming die for flange trimming, so that the preset circular flange is formed into the flange part 11. At this point, the cold heading is completed, and the product obtained by cold heading is subjected to necessary thread rolling, heat treatment, electroplating and other processes to obtain a finished multi-step part.

[0050] During the cold heading process, a clamping mold replacement 3 is added in front of the trimming die, and the clamping jaws in the original first feeding component are replaced with first clamping jaws 4. The first clamping parts 41 included therein are in contact with the side surface of the preset circular flange 11'. A first clamping space adapted to the preset circular flange 11' is formed between the opposite first clamping parts 41 to clamp and transfer the preset part. At the same time, the second clamping parts 42 included therein can be in contact with the end surface of the preset circular flange 11' facing away from the first rod part 12. The opposite second clamping parts 42 together form a stop platform adapted to the end surface, which can also effectively block it, ensuring that the first clamping jaw 4 will not cause the preset part to fly out when passing through the die at high speed, with more stable clamping, and also avoiding the problem of product dropping caused by the time difference between die ejection and clamping. Thus, the first clamping jaw 4 can smoothly pass the preset part through the die to the clamping mold replacement 3 and wait for the second feeding component to clamp and transfer it. The second clamping jaw 5 in the second feeding component includes a third clamping part 51 that is in contact with the side surface of the second rod part 13. A second clamping space adapted to the first rod part 12 or the second rod part 13 is formed between the opposite third clamping parts 51 to clamp and transfer the preset part. Since the die at this station does not process the preset part, there is no need to consider the factors when the preset part ejects from the main die of the die at this station. The thickness of the third clamping part 51 along the axial direction of the preset part is thicker than that of the original clamping jaw 7, thereby extending the effective clamping length of the preset part, ensuring that the preset part can be stably clamped by the second clamping jaw 5 and passed through the die to the trimming die after clamping replacement, and smoothly performing the trimming operation on the flange of the preset part, with high clamping stability, reducing the risks of trimming skew and tail rod part 14 shaving, and improving the product yield rate.

[0051] Thus, a clamping mold replacement 3 is added between the forming die 2 and the trimming die of the original cold heading machine, and the original clamping jaw 7 that passed through the die from the forming die 2 to the trimming die before is replaced with a combination of the first clamping jaw 4 and the second clamping jaw 5, performing a conversion of the clamping position of the preset part once, thereby greatly increasing the effective clamping length of the preset part. The clamping stability of both clamping jaws is higher than that of the original clamping jaw 7, thus ensuring the passing-through stability of the preset part from the forming die 2 to the trimming die, without considering passing-through material dropping, no trimming skew or shaving after passing through the die, thereby ensuring the product yield rate while increasing the passing-through rate, and also eliminating the need for the whole-head machine to participate in the flange trimming operation, saving the machine change time and greatly improving the production efficiency.

[0052] Please refer to Figure 2 、 Figure 3 and Figure 6 . Specifically, in this embodiment, the forming die 2, the clamping mold replacement 3, and the trimming die (not shown in the figure) all include a corresponding main die and a punching die (not shown in the figure);

[0053] The main mold comprises a main mold shell, a main mold cushion block, a main mold ejector pin and a main mold core 61 arranged in the main mold shell, the main mold core 61 has a main mold cavity with an opening facing the punching die, and the main mold ejector pin penetrates the main mold cushion block;

[0054] The die comprises a die shell, a die pad and a die ejector arranged in the die shell, one end of the die ejector is connected to the die pad, and the other end of the die ejector passes through the die shell and faces the main die cavity.

[0055] See also Figure 2 and Figure 3 Specifically, in this embodiment, the molding die 2 adjacent to the clamping die 3 molds the first rod portion 12 and the second rod portion 13 from the middle section of the preset blank formed with the preset circular flange 11' and the tail rod portion 14 to obtain the preset part, which is then ejected from the main mold cavity by the main mold ejector in the main mold. After the punch in the molding die 2 retreats relative to the main mold, the first clamping jaw 4 can be moved to the die opening position of the main mold, so that the first clamping space formed by the first clamping portion 41 opposite to it is opposite to the main mold cavity of the molding die 2 to wait for material connection, and the second clamping portion 42 has a limiting effect on the end surface of the preset circular flange 11' away from the first rod portion 12 after connecting the material, thereby preventing the preset part from flying out.

[0056] Specifically, in this embodiment, the first clamping portion 41 and the third clamping portion 51 are arc-shaped surfaces. In the clamping state, they form surface contact with the preset circular flange 11' and the rod portion of the preset part. The design of the arc-shaped surface enables the first clamping jaw 4 to embrace the outside of the preset part, playing a fixing role, thereby ensuring the stable clamping of the preset part. It should be understood that since the main mold and the punching die are arranged horizontally, the first clamping jaw 4, the second clamping jaw 5 and other transfer clamping jaws arranged between the adjacent molds are all extended in the horizontal direction. In the clamping process, the preset part can be embraced from the peripheral side, and since the first clamping portion 41 and the third clamping portion 51 are arc-shaped surfaces, they play a supporting role on the bottom of the preset part and play a limiting role on both sides.

[0057] Specifically, in this embodiment, the stop platform has an escape portion 43, which is formed by the inward depression of the second clamping portion 42 relative to the stop platform, and can allow the punch ejector pin to pass through and abut against the preset component.

[0058] Specifically, in the present embodiment, a die sleeve is further provided in the die pads of the clamp changing die 3 and the trimming die, and one end of the die ejector is connected to the die spring in the die sleeve. When receiving the preset parts transferred by the first clamp 4 and the second clamp 5, respectively, the corresponding die ejector and main mold ejector respectively abut against the preset circular flange 11' and the end face of the tail rod portion 14 away from the second rod portion 13. At the same time, due to the presence of the die spring, the two ejectors can stably maintain the abutting effect on the preset parts. In this way, both the first clamp 4 and the second clamp 5 can be opened to release the material smoothly without colliding with the mold, and the second clamp 5 will not be cut by the trimming die.

[0059] See also Figure 3 Specifically, in this embodiment, the main mold cavity of the clamp changing mold 3 is a straight section cavity, which is adapted to the rod diameter of the tail rod portion 14, so that the parts of the preset part except the tail rod portion 14 are all located outside the main mold and do not need to be sunk into the mold. The second clamp 5 can be thickened to 9.0 mm, and the effective clamping length of the preset part is improved from the original 2.0 mm to 5.7 mm, thereby ensuring that the second clamp 5 can stably clamp the second rod portion 13 of the preset part and pass it to the trimming mold for flange trimming. Of course, in other embodiments, if the preset part is formed with more rod portions or the rod portions have other forms, the set clamping position of the preset part by the second clamp 5 can also be other rod portions according to the actual production situation, so as to meet the stable clamping of the preset part after clamping. For example, in another embodiment, although the rod portion of the preset part also only includes Figure 6 The first rod portion 12, the second rod portion 13 and the tail rod portion 14 are shown, but the rod diameter of the second rod portion 13 is much smaller than the preset circular flange 11' and the first rod portion 12. Considering the relationship between the opening and releasing time of the second clamping jaw 5 and the time difference of the die movement, the second clamping jaw 5 can be set to clamp the first rod portion 12 of the preset part. At this time, correspondingly, the inner diameter of the straight cavity section is adapted to the rod diameter of the second rod portion 13, so that the part of the preset part except the second rod portion 13 and the tail rod portion 14 is located outside the main mold.

[0060] Specifically, in this embodiment, the forming device also includes a shearing mechanism (not shown in the figure), which is located in front of the forming mold 2 and is used to cut the wire into the preset blank, and then the preset blank is formed into the preset part through multiple forming molds 2.

[0061] See also Figure 4 and Figure 5, specifically, in this embodiment, the multi-step part provided includes a flange portion 11, a first rod portion 12, and a second rod portion 13 that are sequentially connected. The rod diameters of the first rod portion 12, the second rod portion 13, and the tail rod portion 14 decrease in sequence. A thread (not shown in the figure) is formed on the outer wall of the second rod portion 13 by the thread rolling process. The flange portion 11 is hexagonal. Of course, in other embodiments, the flange portion 11 can also be trimmed into other shapes according to actual needs.

[0062] Please refer to Figure 6 , specifically, in another embodiment, a head rod portion 15 is further connected to the end of the flange portion 11 of the multi-step part that faces away from the first rod portion 12. The rod diameter of the head rod portion 15 is smaller than the diameter of the flange portion 11.

[0063] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any changes, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A forming device for a multi-step part, the multi-step part at least comprising a flange portion, a first rod portion, a second rod portion and a tail rod portion that are sequentially connected, and the rod diameters of the first rod portion, the second rod portion and the tail rod portion decreasing in sequence, characterized in that, It comprises a cold heading machine provided with a plurality of forming dies, a clamping die, and a trimming die, and a feeding mechanism for feeding materials between the plurality of dies, wherein the feeding mechanism comprises a first feeding assembly and a second feeding assembly; The plurality of forming dies cooperate together to form the preset blank into a preset circular flange, a first rod portion, a second rod portion and a tail rod portion to obtain a preset part; The clamp-changing mold is used to replace the feeding clamp clamping the preset part, so that the first feeding component clamped on the preset circular flange is replaced with the second feeding component clamped on the first rod part or the second rod part; The trimming die is used to perform flange trimming on the preset part after the feed clamp is replaced, so that the preset circular flange is formed into the flange part; Wherein, the first feeding assembly comprises at least two first clamping jaws arranged opposite to each other, the first clamping jaws comprising a first clamping portion fitted with the side surface of the preset circular flange, and a second clamping portion fitted with the end surface of the preset circular flange away from the first rod portion; a first clamping space adapted to the preset circular flange is formed between the opposite first clamping portions, and the opposite second clamping portions jointly form a stopper adapted to the end surface; The second feeding assembly includes at least two second clamping jaws arranged opposite to each other, and the second clamping jaws include a third clamping portion that fits with the side of the first rod portion or the second rod portion, and a second clamping space that matches the first rod portion or the second rod portion is formed between the opposite third clamping portions.

2. The forming device for the multi-step part according to claim 1, characterized in that, The forming die, the clamping die and the trimming die all include a main die and a punch die that are arranged accordingly; The main mold comprises a main mold shell, a main mold cushion block, a main mold ejector pin and a main mold core arranged in the main mold shell, the main mold core has a main mold cavity with an opening facing the punching die, and the main mold ejector pin is arranged through the main mold cushion block; The die comprises a die shell, a die pad and a die ejector arranged in the die shell, one end of the die ejector is connected to the die pad, and the other end of the die ejector passes through the die shell and faces the main die cavity.

3. The forming device for the multi-step part according to claim 2, characterized in that, The main mold cavity of the clamp-changing mold is a straight section cavity, and the inner diameter of the straight section cavity is adapted to the rod diameter of the second rod part, or, The inner diameter of the straight section cavity is matched with the rod diameter of the tail rod part.

4. The forming device for the multi-step part according to claim 2, characterized in that, A die sleeve is also provided in the die pad of the clamp changing die and the trimming die, and one end of the die ejector pin is connected to the die spring in the die sleeve.

5. The forming device for multi-step parts according to claim 1, characterized in that, When the preset component is ejected from a molding die adjacent to the clamp-changing die, the first clamping space is opposite to the main mold cavity of the molding die.

6. The forming device for multi-step parts according to claim 1, characterized in that, The stop platform has an escape portion, and the escape portion is formed by the second clamping portion being opposite to the second clamping portion being recessed inwardly.

7. The forming device for the multi-step part according to claim 1, characterized in that, The first clamping portion and the third clamping portion are both arc-shaped surfaces. In the clamping state, the arc-shaped surfaces form surface contact with the side surface of the preset component.

8. The forming device for the multi-step part according to claim 1, characterized in that, It also includes a shearing mechanism, which is used to cut the wire into the preset blanks.

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