Hydroforming die in-die piercing punch

Abstract

The application discloses a hydraulic forming die in-die punching punch, which comprises a punch rod and a punch head located at the front end of the punch rod, a side cut is formed on the front end side of the punch head, and the side cut enables the punch cut residual material to be retained on the part and the die; the end of the punch head is provided with a side cut to form an avoidance, and the avoidance enables the residual material sheet after punching to be connected with the body part in a micro connection form, so that the punching waste is left on the part; and the residual material sheet is not easy to flow into the part in a difficult-to-clean position after complete punch cutting. The residual material sheet can be manually removed after the punch cutting is completed, and the complete control effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to an in-mold punch for hydraulic forming molds. Background Technology

[0002] A punch is an active cutting edge in a stamping die that moves up and down with the slide, directly presses in the material, and cooperates with the die to complete shearing or forming. It is not a machine tool accessory, but a core consumable part in the die. In the existing technology, hydraulic forming parts need to punch out main and auxiliary positioning holes during the forming stage. The original punch structure has a round contact surface. After forming and removing the part, the material sheet will flow out with the emulsion. Since the emulsion is an opaque liquid and not easily observed with the naked eye, although the mold cavity can be manually cleaned with a magnet, there is a probability that some material will remain in the mold cavity, which will lead to parts being crushed or mold inserts being damaged during subsequent production. Secondly, the punching waste will also stick to a certain place on the inner wall of the part. If it is not cleaned out, the material sheet will make abnormal noise inside the pipe after the whole vehicle is assembled.

[0003] Therefore, there is an urgent need to develop a new structure or stamping method to avoid residual material pieces falling into the parts after stamping and shearing with a punch, which would affect the use of the parts after forming; and to ensure the quality and reliability of the parts. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an in-mold punch for hydraulic forming molds, which solves the problem of residual material adhering to the mold and the inner wall of the part after punching, which is difficult to observe and clean, thus ensuring the quality and reliability of the part.

[0005] The present invention provides an in-mold punch for a hydraulic forming mold, comprising a punch rod and a punch head located at the front end of the punch rod. The front end of the punch head is side-cut to form a side cut, which allows punching residue to be retained in the part and the mold during punching.

[0006] Furthermore, the bottom and side surfaces of the side cut are not perpendicular, and the side surface is parallel to the axis of the punch.

[0007] Furthermore, the front end face of the stamping head and the side face of the side cut are smoothly chamfered.

[0008] Furthermore, the angle between the bottom surface and the side surface is 90°-180°.

[0009] Furthermore, the side surface does not exceed the axis of the punch in the radial direction, and does not exceed the total length of the punch in the longitudinal direction.

[0010] Furthermore, the side surface is located radially within an axis that is no more than one-third the radius of the punch.

[0011] Furthermore, the stamping head and the punch rod are integrally formed in a stepped shape, and form a concave arc transition.

[0012] Furthermore, the diameter of the stamping head is smaller than the diameter of the punch rod and they are coaxially arranged. The punch rod is provided with a connecting seat away from the stamping head, and the connecting seat is provided with a notch.

[0013] The beneficial effects of this invention are as follows: This invention provides an in-mold punch for a hydraulic forming die. The end of the punch head that performs the punching action has a notch to create a clearance. This clearance allows the residual material after punching to be micro-connected to the main part during punching, keeping the punching waste on the part. This prevents the residual material from flowing with the emulsion into hard-to-clean areas of the part after complete punching. The residual material can be manually removed after punching, achieving complete control. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0016] like Figure 1 The structural diagram of the present invention shows that: a punch for in-mold punching of a hydraulic forming mold in this embodiment includes a punch rod 1 and a punch head 2. The punch head 2 is disposed on the punch rod 1, and the end of the punch head 2 away from the punch rod 1 is provided with a side cut 201. The punch has two parts, namely the punch rod 1 and the punch head 2. The punch rod 1, as the main connecting end for connecting the stamping equipment, needs to be set to form a sufficiently strong and stable column. The punch head 2, as the direct working end for punching, is similar in size and shape to the size and shape to be punched, that is, the size and shape are consistent. The punch head 2 has a certain length so that the punch head 2 still has an effective stroke after punching the mold and the part, and punches away the residual material after the original mold punching from the mold and the part. The stamping head 2 is provided with a side cut 201, which creates a clearance at the end of the stamping head 2. During stamping, the corresponding part of the side cut 201 will not be cut, but the remaining part will remain connected, so that the residual material after stamping can be retained on the mold and the part. After the mold and the part are stamped, the residual material is cleaned manually. This effectively controls the position of the residual material after stamping, so that it will not travel with the emulsion to difficult-to-clean areas in the mold and the part.

[0017] In this embodiment, the bottom surface 2013 and the side surface 2011 of the side cutout 201 are not perpendicularly arranged, and the side surface 2011 is parallel to the axis of the stamping head 2; the bottom surface 2013 and the side surface 2011 of the side cutout 201 are arranged at a certain angle and are not perpendicularly arranged. The side surface 2011 is arranged on the stamping head 2 away from the end of the punch 1 and is parallel to the axis of the stamping head 2. The side surface 2011 is perpendicular to the end face of the punch 1 and does not form a direct smooth transition with the cylindrical surface of the stamping head 2. At the same time, the side surface 2011 extends along the length direction of the stamping head 2 to the end of the stamping head 2 away from the punch 1, so that the end of the stamping head 2 forms a notch. The notch allows residual material to be retained on the part and the mold after stamping.

[0018] In this embodiment, the front end face 202 of the punch head and the side surface 2011 of the side cut 201 form a smooth chamfer transition; the punch head 2 is cylindrical, forming the front end face 202 away from the punch rod 1, and a chamfer 2012 is formed at the junction of the side surface 2011 and the front end face 202, with the chamfer 2012 being a smooth rounded transition; the punch head 2 can be prismatic or cylindrical, depending on the actual size and shape of the hole to be punched; this solution uses a cylindrical punch head as an example, where the end of the punch head 2 away from the punch rod 1 forms the front end face 202, and the size of the front end face 202 is the same as the size of the hole to be punched. The stamped holes are similar, that is, they are the same in shape and size. The front end face 202 and the side face 2011 intersect and the intersection is provided with a rounded chamfer 2012 to form a smooth transition. The front end face 202 and the side face 2011 form a notch. Since the two interfaces are connected by rounding the corners, the stress change at the intersection interface is reduced. This also prevents the notch from being subjected to strong stress and directly sheared when the stamping head 2 is applied to the part and the mold. Instead, the part is pushed by the stamping head 2 and flipped away from the stamping head 2 and stuck on the mold and the part.

[0019] In this embodiment, the angle between the bottom surface 2013 and the side surface 2011 is 90°-180°. There is a height difference between the side surface 2011 and the cylindrical surface of the stamping head 2. Therefore, the side surface 2011 and the stamping head 2 are directly provided with a bottom surface 2013 as a smooth transition. Compared with the conventional setting of directly sinking the side surface 2011, this can improve the fault tolerance. That is to say, during the stamping process of the stamping head 2, when the stamping head 2 cuts off part of the residual material, the connection formed by the side cut 201 will not be cut off all at once, but will be cut off gradually. This makes the entire stamping and the residue of the residual material on the part or mold more controllable. The angle between the bottom surface 2013 and the side surface 2011 is greater than 90° and less than 180°. In this embodiment, a 135° inclination angle with the bottom surface 2013 is preferred, and the resulting stamping control stroke is the most appropriate.

[0020] In this embodiment, the side surface 2011 does not exceed the axis of the stamping head 2 in the radial direction and does not exceed the total length of the stamping head 2 in the length direction. The side surface 2011 is disposed between the cylindrical surface of the stamping head 2 and the interface formed through the axis. The side surface 2011 does not exceed the length of the stamping head. If it exceeds the length of the stamping head 2, it will bend due to radial force when stamping some oblique holes. Therefore, it is more appropriate for the side surface 2011 to be set at one-seventh to one-fifth of the length of the stamping head 2; the punching strength will not be affected.

[0021] In this embodiment, the side surface 2011 is radially no more than one-third of the radius of the stamping head 2. It is most suitable to select the side surface 2011 to the column surface of the stamping head 2 at one-quarter of the column radius. By setting the side surface 2011 at this position to form the side cut 201, the connection between the residual material of the stamping head 2 after punching and the mold and the part will not be too strong or too weak. If the connection is too weak, it will be directly washed away from the part and the mold by the emulsion. If the connection is too strong, that is, too much of the part is punched, it will affect the final forming effect. Therefore, the side surface 2011 should not be set too deep or too shallow, otherwise it will affect the forming effect.

[0022] In this embodiment, the stamping head 2 and the punch rod 1 are integrally formed in a stepped shape. The junction of the stamping head 2 and the punch rod 1 forms a concave arc surface 203 for transition. The integral forming of the stamping head 2 and the punch rod 1 has better overall integrity, and the diameter of the punch rod 1, which is the connecting part of the entire punch, is set to be thicker. This makes it less likely to bend due to possible axial force generated by different processing positions of the parts during operation, resulting in inaccurate punching positioning. The junction of the stamping head 2 and the punch rod 1 is set with a concave arc surface 203 for smooth transition, reducing stress concentration at the junction and improving service life.

[0023] In this embodiment, the diameter of the stamping head 2 is smaller than the diameter of the punch rod 1 and they are coaxially arranged. The punch rod 1 is provided with a connecting seat 101 away from the stamping head 2, and the connecting seat 101 is provided with a notch. The size of the stamping head 2 is the same as the size of the hole to be stamped and is smaller than the diameter of the punch rod 1. The stamping head 2 and the punch rod 1 are coaxially arranged, which makes the positioning more accurate during stamping and reduces the occurrence of punching deviation.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A punch for in-mold punching in a hydraulic forming mold, characterized in that: It includes a punch and a punch head located at the front end of the punch, wherein the front end of the punch head is side-cut to form a side cut, the side cut allowing punching residue to be retained in the part and the die during punching.

2. The in-mold punch for hydraulic forming molds according to claim 1, characterized in that: The bottom and side surfaces of the side cut are not perpendicular, and the side surface is parallel to the axis of the punch.

3. The in-mold punch for hydraulic forming molds according to claim 1, characterized in that: The front end face of the stamping head and the side face of the side cut are smoothly chamfered.

4. The in-mold punch for hydraulic forming molds according to claim 2, characterized in that: The angle between the bottom surface and the side surface is 90°-180°.

5. The in-mold punch for hydraulic forming molds according to claim 2, characterized in that: The side surface does not exceed the axis of the punch in the radial direction, and does not exceed the total length of the punch in the longitudinal direction.

6. The in-mold punch for hydraulic forming molds according to claim 2, characterized in that: The side surface is located on the axis that is no more than one-third of the radius of the punch in the radial direction.

7. The in-mold punch for hydraulic forming molds according to claim 1, characterized in that: The stamping head and the punch rod are integrally formed in a stepped shape, and form a concave arc transition.

8. The in-mold punch for hydraulic forming molds according to claim 1, characterized in that: The diameter of the punch head is smaller than the diameter of the punch rod and they are coaxially arranged. The punch rod is provided with a connecting seat away from the punch head, and the connecting seat is provided with a notch.

Images