Hollow workpiece cold heading die

Abstract

The utility model provides a kind of hollow workpiece cold heading die, it includes shaping die, multiple hole front forming die and piercing die, each station die includes the main mould and punch corresponding arrangement;Piercing die further includes the material removal mechanism between its main mould and punch, material removal mechanism at least includes the first baffle and second baffle being set perpendicular to the movement direction of punch, second baffle is away from the punch of piercing die compared to first baffle, and there is preset distance between second baffle and main mould, the punch of piercing die includes the punch bar that can successively penetrate the first passage of first baffle and the second passage of second baffle to approach its main mould;The outer diameter of hollow workpiece is greater than the inner diameter of first passage and less than the inner diameter of second passage.The hollow workpiece cold heading die provided by the utility model forms material removal mechanism on the basis of original material removal plate, can effectively block product piece and mould, avoid product piece splashing and damage to machine, improve product yield.

Description

Technical Field

[0001] This utility model belongs to the field of fastener production and processing technology, and in particular relates to a cold heading mold for hollow workpieces. Background Technology

[0002] Multi-station nut cold heading machines typically have six dies and six punches. When cold heading hollow workpiece 1, the last station (piercing die) needs to remove excess material from the blank by punching. At this time, a stripper plate 2 (perpendicular to the direction of punch movement) is used to separate the punched hollow workpiece 1 from the punch. However, multi-station nut cold heading forming machines are generally used for high-speed continuous production operations, such as production speeds of up to 150 pcs / min. In such high-speed continuous production processes, the stripper plate 2 cannot effectively separate the hollow workpiece 1, causing it to fly everywhere (due to being pushed out of the main die cavity at high speed, the hollow workpiece 1 may impact the cold heading die more than once), resulting in quality problems such as impact damage, crushing damage, and dents. This significantly reduces the product yield. Utility Model Content

[0003] In view of the problems existing in the prior art, the main purpose of this utility model is to provide a hollow workpiece cold heading mold. The provided hollow workpiece cold heading mold forms a stripping mechanism on the basis of the original stripping plate, which can effectively separate the product parts from the mold, avoid product parts splashing and hitting the machine and causing damage, and improve the product yield.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] This utility model provides a cold heading mold for hollow workpieces, which includes a forming mold, multiple pre-hole forming molds and a piercing mold. Each station mold includes a corresponding main mold and a punching mold.

[0006] The piercing die also includes a stripping mechanism disposed between its main die and the punch. The stripping mechanism includes at least a first baffle and a second baffle disposed perpendicular to the movement direction of the punch. The second baffle is farther away from the punch of the piercing die than the first baffle, and there is a preset distance between the second baffle and the main die. The punch of the punch of the piercing die can pass through the first channel of the first baffle and the second channel of the second baffle in sequence to approach its main die. The outer diameter of the hollow workpiece is larger than the inner diameter of the first channel and smaller than the inner diameter of the second channel.

[0007] As a further description of the above technical solution, the outer diameter of the punch is smaller than the inner diameter of the first channel.

[0008] As a further description of the above technical solution, a receiving mechanism is also provided below the stripping mechanism to receive the hollow workpiece.

[0009] As a further description of the above technical solution, after the through hole of the hollow workpiece is formed, the hollow workpiece is pushed from the main mold cavity of the perforating mold through the second channel into the space between the first baffle and the second baffle, and thus falls into the receiving mechanism.

[0010] As a further description of the above technical solution, the stripping mechanism is detachably disposed between the main mold and the punching mold of the piercing mold.

[0011] As a further description of the above technical solution, the stripping mechanism also includes a top plate and two side plates connecting the first baffle and the second baffle, wherein the top plate and the side plates extend along the movement direction of the punch.

[0012] As a further description of the above technical solution, a feeding mechanism is also included, which is used to feed materials between multiple molds.

[0013] As a further description of the above technical solution, the feeding mechanism for feeding material between the piercing mold and the adjacent pre-forming mold is located axially between the second baffle and the main mold of the piercing mold.

[0014] As a further description of the above technical solution, the feeding mechanism is a die clamp.

[0015] Based on the above technical solutions, the outstanding effects of this utility model are as follows:

[0016] The hollow workpiece cold heading die provided by this utility model still includes a forming die for shaping the blank, multiple pre-forming dies for forming other parts of the hollow workpiece, and a piercing die for punching out scrap to form the internal through hole of the hollow workpiece. Each station die includes a corresponding main die and a punch. Unlike the prior art piercing die which only has a stripper plate, this piercing die has a stripper mechanism between the main die and the punch. The stripper mechanism includes at least a first baffle and a second baffle perpendicular to the movement direction of the punch. The second baffle is farther away from the punch of the piercing die than the first baffle, and there is a preset distance between the second baffle and the main die. The punch of the punch can sequentially penetrate the first channel of the first baffle and the second channel of the second baffle to approach it. The main mold, in conjunction with the main mold, punches away the waste material from the blank passing through the die to form the through hole of the hollow workpiece. The outer diameter of the hollow workpiece is slightly larger than the inner diameter of the first channel and slightly smaller than the inner diameter of the second channel. After the waste punching and piercing operation is completed, the hollow workpiece is pushed by the ejector pin (e.g., the main mold ejector pin) in the main mold and enters between the second and first baffles along with the reset punch. However, due to the obstruction of the first baffle, it will not move axially towards the die side and collide with the die components to cause damage. Even if it impacts the first baffle and bounces back, it will be effectively blocked by the second baffle (during the reverse movement of the impact, due to its own gravity and other factors, it will not pass through the second channel in reverse and collide with the main mold components to cause damage, thus ensuring the high yield of the hollow workpiece). Attached Figure Description

[0017] Figure 1 This is a partial structural diagram of a hollow workpiece being stripped using a stripper plate installed at a perforation die station in the prior art.

[0018] Figure 2 This is a partial structural diagram of the hollow workpiece being unloaded using the unloading mechanism provided at the perforation mold station in an embodiment of this utility model.

[0019] Explanation of icon numbers:

[0020] 1. Hollow workpiece; 2. Stripper plate; 3. First baffle; 4. Second baffle; 5. First channel; 6. Second channel; 7. Through hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The implementation methods of this utility model will now be described based on its overall structure.

[0023] Please see Figure 2 This utility model discloses a cold heading mold for hollow workpieces, which includes a forming mold, multiple pre-hole forming molds and a piercing mold. Each station mold includes a corresponding main mold and a punching mold.

[0024] The piercing die also includes a stripping mechanism disposed between its main die and the punch. The stripping mechanism includes at least a first baffle 3 and a second baffle 4 disposed perpendicular to the movement direction of the punch. The second baffle 4 is farther away from the punch of the piercing die than the first baffle 3, and there is a preset distance between the second baffle 4 and the main die. The punch of the punch of the piercing die can pass through the first channel 5 of the first baffle 3 and the second channel 6 of the second baffle 4 in sequence to approach its main die. The outer diameter of the hollow workpiece 1 is larger than the inner diameter of the first channel 5 and smaller than the inner diameter of the second channel 6.

[0025] In the above-described configuration, the hollow workpiece cold heading die still includes a forming die for shaping the blank, multiple pre-forming dies for forming other parts of the hollow workpiece 1, and a piercing die for punching out scrap to form the internal through hole 7 of the hollow workpiece 1. Each station die includes a corresponding main die and punching die; unlike the prior art piercing die which only has such... Figure 1Instead of a stripper plate 2, a stripping mechanism is provided between the main die and the punch of the piercing die. The stripping mechanism includes at least a first baffle 3 and a second baffle 4 arranged perpendicular to the movement direction of the punch. The second baffle 4 is farther away from the punch of the piercing die than the first baffle 3, and there is a preset distance between the second baffle 4 and the main die. The punch of the piercing die can sequentially pass through the first channel 5 of the first baffle 3 and the second channel 6 of the second baffle 4 to approach its main die, thereby cooperating with the main die to punch away the waste material of the blank passing through the piercing die to form the through hole 7 of the hollow workpiece 1. The outer diameter of the hollow workpiece 1 is slightly larger than the first channel. The inner diameter of the 5th channel is slightly smaller than the inner diameter of the second channel 6. After the blanking and piercing operation is completed, the hollow workpiece 1 is pushed by the ejector (e.g., the ejector pin of the main mold) in the main mold and the reset punch can enter between the second baffle 4 and the first baffle 3. However, due to the obstruction of the first baffle 3, it will no longer move axially towards the die side and collide with the die components to cause damage. Even if it impacts the first baffle 3 and bounces back, it will be effectively blocked by the second baffle 4 (during the reverse movement of the impact, due to its own gravity and other factors, it will no longer pass through the second channel 6 in the reverse direction and collide with the main mold components to cause damage, thereby ensuring the high yield of the hollow workpiece 1).

[0026] Please see Figure 2 Specifically, in this embodiment, the outer diameter of the punch (not shown in the figure) is smaller than the inner diameter of the first channel 5, so that the first baffle 3 and the second baffle 4 only serve to block the hollow workpiece 1 and do not interfere with the action of the punch moving axially towards the main mold side to cooperate with the main mold to punch waste and pierce, as well as the action of reverse reset.

[0027] Specifically, in this embodiment, a receiving mechanism (not shown in the figure) is also provided below the stripping mechanism to receive the hollow workpiece 1. Further, after the through hole 7 of the hollow workpiece 1 is formed, the hollow workpiece 1 is pushed by an ejector (e.g., a main mold ejector pin) from the main mold cavity of the perforating mold through the second channel 6 into the space between the first baffle 3 and the second baffle 4, thereby falling into the receiving mechanism. It should be understood that during the process of the hollow workpiece 1 falling downwards into the receiving mechanism, even if there is a gap between the receiving mechanism and the stripping mechanism, the maximum distance of this gap is insufficient to allow the hollow workpiece 1 to fly out or get stuck, thus allowing the hollow workpiece 1 to smoothly fall into the receiving mechanism for transfer.

[0028] Specifically, in this embodiment, the stripping mechanism is detachably disposed between the main mold and the punch of the piercing mold, for example, by using multiple fasteners assembled between the main mold and the punch of the piercing mold, thereby facilitating maintenance and replacement.

[0029] Specifically, in this embodiment, the stripping mechanism further includes a top plate and two side plates connecting the first baffle 3 and the second baffle 4. The top plate and side plates extend along the movement direction of the punch, thereby blocking the hollow workpiece 1 in the front, back, left, right and top, ensuring that the hollow workpiece 1 will not fly out between the two baffles and collide with the mold and be damaged, but will fall smoothly into the receiving mechanism.

[0030] Specifically, in this embodiment, the hollow workpiece cold heading mold further includes a feeding mechanism (not shown in the figure), which is used to feed materials between multiple molds.

[0031] Specifically, in this embodiment, the feeding mechanism for feeding material between the piercing die and the adjacent pre-forming die is axially located between the second baffle 4 and the main die of the piercing die. This prevents the stripping mechanism from interfering with the process of the blank of the hollow workpiece 1 being formed into the through hole 7 and then passing through the die to the piercing die. It should be understood that the axial length of the blank (which has the same length as the hollow workpiece 1) is less than the preset distance between the second baffle 4 and the main die of the piercing die. After the through hole 7 of the hollow workpiece 1 is formed, it can be pushed across this preset distance to reach the space between the first baffle 3 and the second baffle 4.

[0032] Specifically, in this embodiment, the feeding mechanism is a die clamp. The die clamp moves between the various dies to feed materials.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 make equivalent substitutions for some of the technical features. Any changes, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold heading die for hollow workpieces, characterized in that, It includes forming molds, multiple pre-hole forming molds and piercing molds, and each station mold includes a corresponding main mold and punching mold; The piercing die also includes a stripping mechanism disposed between its main die and the punch. The stripping mechanism includes at least a first baffle and a second baffle disposed perpendicular to the movement direction of the punch. The second baffle is farther away from the punch of the piercing die than the first baffle, and there is a preset distance between the second baffle and the main die. The punch of the punch of the piercing die can pass through the first channel of the first baffle and the second channel of the second baffle in sequence to approach its main die. The outer diameter of the hollow workpiece is larger than the inner diameter of the first channel and smaller than the inner diameter of the second channel.

2. The hollow workpiece cold heading die according to claim 1, characterized in that, The outer diameter of the punch is smaller than the inner diameter of the first channel.

3. The hollow workpiece cold heading die according to claim 2, characterized in that, Below the unloading mechanism is a receiving mechanism to receive the hollow workpiece.

4. The hollow workpiece cold heading die according to claim 3, characterized in that, After the through hole of the hollow workpiece is formed, the hollow workpiece is pushed from the main mold cavity of the perforating mold through the second channel into the space between the first baffle and the second baffle, and thus falls into the receiving mechanism.

5. The hollow workpiece cold heading die according to claim 1, characterized in that, The stripping mechanism is detachably located between the main mold and the punching mold of the piercing mold.

6. The hollow workpiece cold heading die according to claim 1, characterized in that, The stripping mechanism also includes a top plate and two side plates connecting the first baffle and the second baffle, and the top plate and side plates extend along the movement direction of the punch.

7. The hollow workpiece cold heading die according to claim 1, characterized in that, It also includes a feeding mechanism for feeding materials between multiple molds.

8. The hollow workpiece cold heading die according to claim 7, characterized in that, The feeding mechanism for feeding material between the piercing die and the adjacent pre-hole forming die is located axially between the second baffle and the main die of the piercing die.

9. The hollow workpiece cold heading die according to claim 7, characterized in that, The feeding mechanism is a die clamp.

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