Forming device of trimming part and trimming part

Abstract

The utility model provides a forming device of a trimming part and the trimming part. In the forming device, a plurality of pre-forming die positions are matched to be used for forming a pre-formed blank into a pre-formed piece comprising a pre-formed flange and a tail rod part connected to one end of the pre-formed flange; the trimming die position trims and forms a preset flange into a flange part; the trimming die position comprises a main die and a punching die which are correspondingly arranged; a stamping die cutter is arranged on the end face, opposite to the main die, of the stamping die, the main die comprises a main die shell, a main die cushion block arranged in the main die shell, a main die ejector pin and a main die core, and the main die core is provided with a main die cavity with an opening facing the stamping die; the main die ejector pin movably penetrates through the main die cushion block in the axial direction. A main die push pipe sleeved on the main die ejector pin is connected with the end face, facing the stamping die, of the main die cushion block through a damping piece; the main mold push pipe and the main mold ejector pin penetrate into the main mold cavity from the bottom of the main mold cavity; during edge cutting, the end faces, facing the punching die, of the main die ejector pin and the main die push rod abut against the end face, deviating from the preset flange, of the tail rod part and the end face, facing the tail rod part, of the preset flange correspondingly.

Description

Technical Field

[0001] The utility model belongs to the technical field of fastener molding, and in particular relates to a molding device for a trimming part and the trimming part. Background Art

[0002] At present, in the production of fasteners such as screws and nuts, cold heading machines are often used for direct cold heading. The cold heading machine is equipped with multiple preforming dies and trimming stations, so that some fasteners with complex structures can be cut off from the main body without changing the machine to form the trimming part, and then undergo the necessary thread rolling, heat treatment and electroplating processes, which effectively improves the production efficiency of fasteners with complex structures. However, in actual production, it is found that the trimming effect of the trimming die set on the cold heading machine is sometimes not ideal: for example, Figure 1 As shown, the parts to be produced include a flange portion 11, a middle rod portion 13 and a tail rod portion 12 connected in sequence, and the rod diameters of the flange portion 11, the middle rod portion 13 and the tail rod portion 12 decrease in sequence. The conventional trimming die position provided on the cold heading machine includes a corresponding punch die and a main die 2, the main die 2 is provided with a main die cavity with an opening toward the punch die, and the multiple preforming die positions provided on the cold heading machine cooperate together to form the blank into a preset flange and a middle rod portion 13 and a tail rod portion 12 connected to the right end of the preset flange, and the obtained preset part is then transferred to the trimming die position, wherein the rod portion 13 and the tail rod portion 12 are received in the main die cavity of the main die 2, and the punch die moves axially toward the main die 2 to perform flange trimming on the preset part, so that The preset flange is formed into a flange part 11, and during the trimming process, the preset part is only stressed through its two ends that are axially opposed. Since the radial ratio of the flange part 11 and the rod part is very different, or the tail rod part 12 is small, the force surface is small, and the force is concentrated, the tail rod part 12 often expands and deforms, and the step rod diameter exceeds the tolerance, resulting in poor finished products. This problem is more obvious when the thickness of the preset flange to be trimmed is thick; and if the tail rod part 12 expands too much, it is easy to get stuck, resulting in a collision and damage to the mold. This makes it difficult to adjust the cold heading machine, requiring the machine adjuster to have a high level of machine adjustment technology, and the adjustment time is long, which is not conducive to the control of production costs. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of the utility model is to provide a forming device for trimming parts. By increasing the force area of ​​the preset parts during trimming and arranging a damping part to absorb part of the punching force, the deformation of the tail rod part of the part can be effectively avoided, the product quality rate can be ensured, the service life of the forming device can be extended, and the technical requirements for machine adjustment can be reduced.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model provides a forming device for trimming parts, wherein the trimming parts at least include a flange part and a tail rod part connected to one end of the flange part, the rod diameter of the flange part is larger than the rod diameter of the tail rod part, and the forming device includes a cold heading machine provided with a plurality of preforming dies and trimming dies;

[0006] The plurality of preforming mold positions cooperate together to form a preset blank into a preset part, wherein the preset part includes a preset flange and a tail rod portion connected to one end of the preset flange;

[0007] The trimming die is used to trim the preset part so that the preset flange is formed into the flange part;

[0008] Wherein, the trimming die position comprises a main die and a punch die which are arranged correspondingly; the end face of the punch die opposite to the main die is provided with a punch die cutter; the main die comprises a main die shell, a main die cushion block, a main die ejector pin and a main die core which are arranged in the main die shell; the main die core has a main die cavity with an opening facing the punch die; the main die ejector pin is movable along the axial direction and penetrates the main die cushion block; the main die push tube sleeved on the main die ejector pin is connected with the end face of the main die cushion block facing the punch die through a damping member; the main die push tube and the main die ejector pin both penetrate into the main die cavity from the bottom of the main die cavity;

[0009] During trimming, the end face of the main mold ejector pin facing the punching die abuts against the end face of the tail rod portion away from the preset flange, and the end face of the main mold push tube facing the punching die abuts against the end face of the preset flange facing the tail rod portion.

[0010] As a further description of the above technical solution, the outer wall of the main mold push tube is in contact with the main mold cavity; the main mold ejector pin is slidably matched with the inner wall of the main mold push tube.

[0011] As a further description of the above technical solution, when the damping member is in a relaxed state, the end surface of the main mold push tube facing the punching die protrudes from the opening end surface of the main mold cavity.

[0012] As a further description of the above technical solution, when the damping member is in a relaxed state, the distance between the end face of the main mold push tube facing the punch die and the opening end face of the main mold cavity is 2.5mm-3.5mm.

[0013] As a further description of the above technical solution, the damping member is a mold spring.

[0014] As a further description of the above technical solution, the main mold of the trimming mold position also includes a main mold push rod, which passes through the main mold pad block, and the top of the main mold push rod abuts against the end of the main mold push pin away from the punching die.

[0015] As a further description of the above technical solution, it also includes a shearing mechanism and a feeding mechanism;

[0016] The shearing mechanism is used to cut the wire into the preset blanks;

[0017] The feeding mechanism is used for feeding materials between the plurality of preforming mold positions and trimming mold positions.

[0018] The utility model also provides a trimming part, which is made by the trimming part forming device as described above, wherein the trimming part at least comprises a flange part and a tail rod part connected to one end of the flange part, and the rod diameter of the flange part is larger than the rod diameter of the tail rod part.

[0019] As a further description of the above technical solution, the trimming part further includes at least one middle rod portion and a head rod portion; wherein,

[0020] The middle rod portion is connected between the flange portion and the tail rod portion, and the rod diameters of the flange portion, the middle rod portion and the tail rod portion decrease in sequence;

[0021] The head rod portion is connected to an end of the flange portion away from the tail rod portion, and the radial cross-sectional width of the head rod portion is smaller than the radial cross-sectional width of the flange portion.

[0022] In summary, the outstanding effects of the utility model are:

[0023] In the forming device of the trimming parts provided by the utility model, a main mold push tube and a damping member are additionally arranged in the main mold of the original trimming mold position; the additional main mold push tube is sleeved on the main mold ejector pin, one end of which penetrates into the main mold cavity, and the other end is connected to the main mold cushion block through the damping member; during trimming, the end faces of the main mold ejector pin and the main mold push rod facing the punching die respectively abut against the end face of the tail rod part away from the preset flange and the end face of the preset flange facing the tail rod part, so that when the punching force generated by the punching die is transmitted to the end face of the preset flange facing the tail rod, the punching force is no longer completely transmitted to the tail rod, but part of the punching force is transmitted to the main mold push tube, which is then absorbed by the damping member connected to the main mold push tube, thereby reducing the punching force borne by the tail rod during the trimming process, effectively avoiding the risk of the tail rod expanding and deforming due to concentrated force, ensuring the product quality rate, and accordingly, the trimming process is not easy to damage the mold due to the expansion and jamming of the tail rod, and the technical requirements for machine adjustment are also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a trimming die in the prior art;

[0026] Figure 2 It is a schematic structural diagram of the trimming die position in the embodiment of the utility model.

[0027] Description of Figure Numbers:

[0028] 11. Flange part; 12. Tail rod part; 13. Middle rod part; 14. Head rod part; 2. Main mold; 21. Main mold ejector pin; 22. Main mold core; 23. Main mold push tube; 24. Damping part; 31. Die cutter. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] The following is combined with Figure 2 And examples are described in detail.

[0032] This embodiment provides a forming device for trimming parts, wherein the trimming parts at least include a flange portion 11 and a tail rod portion 12 connected to one end of the flange portion 11, wherein the rod diameter of the flange portion 11 is greater than the rod diameter of the tail rod portion 12, and the forming device includes a cold heading machine provided with a plurality of preforming dies and trimming dies;

[0033] The plurality of preforming mold positions cooperate together to form a preset blank into a preset part, wherein the preset part includes a preset flange and a tail rod portion 12 connected to one end of the preset flange;

[0034] The trimming die is used to trim the preset part so that the preset flange is formed into the flange portion 11;

[0035] The trimming die position includes a main die 2 and a punch die that are arranged correspondingly; the end face of the punch die opposite to the main die 2 is provided with a punch die cutter 31; the main die 2 includes a main die 2 shell, a main die 2 cushion block, a main die ejector pin 21 and a main die core 22 arranged in the main die 2 shell, and the main die core 22 has a main die cavity with an opening facing the punch die; the main die ejector pin 21 is movable along the axial direction and penetrates the main die 2 cushion block; the main die push tube 23 sleeved on the main die ejector pin 21 is connected to the end face of the main die 2 cushion block facing the punch die through a damping member 24; the main die push tube 23 and the main die ejector pin 21 both penetrate into the main die cavity from the bottom of the main die cavity;

[0036] During trimming, the end face of the main mold ejector pin 21 facing the punching die abuts against the end face of the tail rod portion 12 away from the preset flange, and the end face of the main mold push tube 23 facing the punching die abuts against the end face of the preset flange facing the tail rod portion 12.

[0037] By means of the above structure, a multi-station cold heading machine is used to process the preset blank in multiple molds and multiple punches, and cold heading trimming is performed in the last mold. The operator can first use the multiple pre-forming molds to form the preset part, which includes a preset flange and a tail rod portion 12 connected to one end of the preset flange, and then the formed preset part is passed through the mold to the trimming mold to perform the trimming operation of the preset flange, so that the preset flange is formed into the flange portion 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 trimming part.

[0038] After the preset part is passed through the mold to the trimming mold position, the tail rod of the preset part is received in the main mold cavity of the main mold core 22, and the preset flange included therein is located outside the main mold cavity. The punch of the trimming mold position then moves toward the main mold 2, so that the punch cutter 31 provided on its end face opposite to the main mold 2 can cut off the excess edge waste of the preset flange.

[0039] A main mold push tube 23 and a damping member 24 are additionally provided in the main mold 2 of the trimming mold position, and the main mold push tube 23, like the main mold ejector pin 21, penetrates into the main mold cavity from the bottom of the main mold cavity with one end facing the punching die, and the end away from the punching die is connected to the main mold 2 pad through the damping member 24, so that in the process of trimming, not only the end face of the main mold ejector pin 21 facing the punching die abuts against the end face of the tail rod part 12 away from the preset flange, but also the end face of the main mold push tube 23 facing the punching die abuts against the end face of the preset flange facing the tail rod part 12, so that the punching pressure brought to the preset part by the punching die movement is no longer borne only by the tail rod part 12, but is dispersed to the preset flange abutting against the main mold push tube 23. It is equivalent to that during the trimming process, the punching force is applied to the preset flange through the die cutter 31, and then transmitted in the direction of the tail rod, but when the punching force is transmitted to the end face of the preset flange facing the tail rod, it is no longer all transmitted to the tail rod, but part of the punching force is transmitted to the main mold push tube 23, and then absorbed by the damping member 24 connected to the main mold push tube 23, thereby reducing the punching force borne by the tail rod during the trimming process, effectively avoiding the risk of the tail rod expanding and deforming due to concentrated force, ensuring the product quality rate, accordingly, the trimming process is not easy to damage the mold due to the expansion and jamming of the tail rod, and the technical requirements for machine adjustment are also reduced.

[0040] See also Figure 2 Specifically, in this embodiment, the punching die defining the trimming die position is located on the left side of the main die 2 included therein, and the main die 2 is located on the right side of the punching die. The preset component includes a preset flange portion 11, a head rod portion 14 connected to the left end of the preset flange portion 11, and a middle rod portion 13 and a tail rod portion 12 connected to the right end of the preset flange portion 11 in sequence. The diameters of the preset flange portion 11, the middle rod portion 13 and the tail rod portion 12 decrease in sequence. After trimming is completed, the preset flange portion 11 of the preset component is cut off from the edge waste and formed into the flange portion 11.

[0041] Specifically, in this embodiment, the outer wall of the main mold push tube 23 is arranged to fit with the main mold cavity, and the main mold ejector pin 21 is slidably matched with the inner wall of the main mold push tube 23, thereby ensuring the matching accuracy of the components of the trimming mold position, so that the preset part always enters and exits the main mold cavity along a horizontal axis, and the horizontal axis coincides with the central axis of the main mold cavity. More specifically, the middle rod portion 13 and the tail rod portion 12 of the preset part always enter and exit the main mold 2 sleeve along a horizontal axis. It should be understood that the main mold ejector pin 21 is slidably matched with the inner wall of the main mold push tube 23, ensuring that it can play a role in receiving the preset part in the process of the preset part entering the main mold cavity to the right, and can push it to the left of the main mold cavity after the trimming operation is completed.

[0042] Specifically, in the present embodiment, when the damping member 24 is in a relaxed state, the left end face of the main mold push tube 23 protrudes 3 mm from the left open end face of the main mold cavity, and after the preset member is passed through the mold to the trimming mold position, its axial ends are clamped by the punch and the main mold ejector pin 21. As the punch continuously approaches the main mold 2 to the right, the tail rod portion 12 and the middle rod portion 13 of the preset member will be pushed to the right into the main mold cavity of the main mold 2 in sequence. Therefore, after the right end face of the preset flange of the preset member contacts the left end face of the main mold push tube 23, the punch continues to move to the right, which will cause the main mold push tube 23 to gradually compress the damping member 24 connected to its right end to the right, so that the main mold push tube 23 will continue to move synchronously with the preset member and the main mold ejector pin 21. The step is displaced to the right, which is equivalent to the stamping force generated by the punching die to the right being dispersed after the right end face of the preset flange of the preset part contacts the left end face of the main mold push tube 23, so that the main mold push tube 23 can compress the damping member 24 to the right until the trimming action is completed; the main mold ejector pin 21 and the main mold push tube 23 both move to the right to the preset position, that is, at the moment when the punching die cutter 31 finally completes the trimming, the main mold push tube 23 and the main mold ejector pin 21 respectively abut against the preset flange of the preset part and the right end of the tail rod part 12 to support the preset part in the axial direction, which is equivalent to increasing the force area of ​​the preset part during trimming and reducing the stamping force transmitted to the tail rod part 12 of the preset part, so that the tail rod part 12 is not easily deformed during the trimming process. It should be understood that the relaxed state of the damping member 24 refers to the state in which the damping member 24 is neither stretched nor compressed when not subjected to external force. Of course, in other embodiments, the left end face of the main mold push tube 23 protrudes from the left open end face of the main mold cavity, and the distance between the two end faces can also be set to other values ​​between 2.5mm-3.5mm according to the length of the tail rod part 12 that is prone to expansion and deformation from its right end.

[0043] Specifically, in the present embodiment, the damping member 24 is a mold spring, which has high rigidity and long service life, and is beneficial to prolonging the overall service life of the trimming mold main mold 2 .

[0044] Specifically, in the present embodiment, the main mold 2 of the trimming mold position further includes a main mold ejector rod, which passes through the main mold 2 pad setting, and the left end of the main mold ejector rod abuts against the right end of the main mold ejector pin 21, and the right end of the main mold ejector rod is connected to a driving mechanism, which can push the main mold ejector pin 21 axially under the drive of the driving structure, so that the main mold ejector pin 21 extends to the left of the main mold cavity before trimming and receives the preset part; during the trimming process, the right end of the tail rod of the preset part is kept against, so as to provide support for the preset part during trimming; after the trimming is completed, the main mold ejector pin 21 can eject the preset part with the cut edge waste out of the main mold cavity. It should be understood that in this embodiment, when the damping member 24 is in a relaxed state, the left end face of the main mold push tube 23 protrudes from the left open end face of the main mold cavity. Therefore, after the trimming is completed, the main mold push tube 23 will cooperate with the main mold ejector pin 21 to eject the preset part with the cut edge waste out of the main mold cavity.

[0045] Specifically, in this embodiment, the forming device of the trimming part also includes a shearing mechanism and a feeding mechanism; the shearing mechanism is used to cut the wire into the preset blank; the feeding mechanism is used to feed between the multiple preforming dies and trimming dies.

[0046] Specifically, in this embodiment, the trimming part provided is made by the above-mentioned trimming part forming device, which includes a flange portion 11, a head rod portion 14 connected to the left end of the flange portion 11, and a middle rod portion 13 and a tail rod portion 12 connected to the right end of the flange portion 11 in sequence; wherein the radial cross-sectional width of the head rod portion 14 is smaller than the radial cross-sectional width of the flange portion 11, and the rod diameters of the flange portion 11, the middle rod portion 13 and the tail rod portion 12 decrease in sequence. The middle rod portion 13 is also formed with threads through a thread rolling process. Of course, in other embodiments, the number of the middle rod portions 13 of the trimming part may be more than one, and the head rod portion 14 may not be provided.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A forming device for trimming parts, the trimming parts at least comprising a flange part and a tail rod part connected to one end of the flange part, the rod diameter of the flange part being larger than the rod diameter of the tail rod part, characterized in that: The forming device comprises a cold heading machine provided with a plurality of preforming dies and trimming dies; The plurality of preforming mold positions cooperate together to form a preset blank into a preset part, wherein the preset part includes a preset flange and a tail rod portion connected to one end of the preset flange; The trimming die is used to trim the preset part so that the preset flange is formed into the flange part; Wherein, the trimming die position comprises a main die and a punch die which are arranged correspondingly; the end face of the punch die opposite to the main die is provided with a punch die cutter; the main die comprises a main die shell, a main die cushion block, a main die ejector pin and a main die core which are arranged in the main die shell; the main die core has a main die cavity with an opening facing the punch die; the main die ejector pin is movable along the axial direction and penetrates the main die cushion block; the main die push tube sleeved on the main die ejector pin is connected with the end face of the main die cushion block facing the punch die through a damping member; the main die push tube and the main die ejector pin both penetrate into the main die cavity from the bottom of the main die cavity; During trimming, the end face of the main mold ejector pin facing the punching die abuts against the end face of the tail rod portion away from the preset flange, and the end face of the main mold push tube facing the punching die abuts against the end face of the preset flange facing the tail rod portion.

2. The forming device for trimming parts according to claim 1, characterized in that: The outer wall of the main mold push tube is in contact with the main mold cavity; the main mold ejector pin is in sliding cooperation with the inner wall of the main mold push tube.

3. The forming device for trimming parts according to claim 1, characterized in that: When the damping member is in a relaxed state, the end surface of the main mold push tube facing the punching die protrudes from the open end surface of the main mold cavity.

4. The forming device for trimming parts according to claim 3, characterized in that: When the damping member is in a relaxed state, the distance between the end surface of the main mold push tube facing the punching die and the opening end surface of the main mold cavity is 2.5 mm-3.5 mm.

5. The forming device for trimming parts according to claim 3, characterized in that: The damping member is a mold spring.

6. The forming device for trimming parts according to claim 1, characterized in that: The main die of the trimming die position further comprises a main die ejector rod, which penetrates through the main die cushion block, and the top end of the main die ejector rod abuts against an end of the main die ejector pin away from the punching die.

7. The forming device for trimming parts according to claim 1, characterized in that: It also includes a shearing mechanism and a feeding mechanism; The shearing mechanism is used to cut the wire into the preset blanks; The feeding mechanism is used for feeding materials between the plurality of preforming mold positions and trimming mold positions.

8. A trimming part, characterized in that: The trimming part is made by using the molding device of any one of claims 1 to 7, wherein the trimming part comprises at least a flange portion and a tail rod portion connected to one end of the flange portion, and the rod diameter of the flange portion is greater than the rod diameter of the tail rod portion.

9. The trimming component according to claim 8, characterized in that: The trimming part also includes at least one middle rod portion and a head rod portion; wherein, The middle rod portion is connected between the flange portion and the tail rod portion, and the rod diameters of the flange portion, the middle rod portion and the tail rod portion decrease in sequence; The head rod portion is connected to an end of the flange portion away from the tail rod portion, and the radial cross-sectional width of the head rod portion is smaller than the radial cross-sectional width of the flange portion.

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