KR20170076054A - Piercing punches for hydroforming - Google Patents

Piercing punches for hydroforming Download PDF

Info

Publication number
KR20170076054A
KR20170076054A KR1020150185798A KR20150185798A KR20170076054A KR 20170076054 A KR20170076054 A KR 20170076054A KR 1020150185798 A KR1020150185798 A KR 1020150185798A KR 20150185798 A KR20150185798 A KR 20150185798A KR 20170076054 A KR20170076054 A KR 20170076054A
Authority
KR
South Korea
Prior art keywords
punching
hydroforming
hole
punch
present
Prior art date
Application number
KR1020150185798A
Other languages
Korean (ko)
Other versions
KR101775878B1 (en
Inventor
한상빈
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020150185798A priority Critical patent/KR101775878B1/en
Publication of KR20170076054A publication Critical patent/KR20170076054A/en
Application granted granted Critical
Publication of KR101775878B1 publication Critical patent/KR101775878B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves

Abstract

A piercing punch for hydroforming is disclosed.
The punching portion of the disclosed punching punch for hydroforming is composed of a vertical portion having a constant outer diameter and an inclined portion integrally provided at a lower portion of the vertical portion and having its outer diameter gradually becoming smaller downward.

Description

[0001] Piercing punches for hydroforming [0002]

The present invention relates to a piercing punch for hydroforming.

In particular, the present invention relates to a punching punch for hydroforming, which prevents defective machining during hole processing by hydroforming, and prevents insertion of the piercing punch during return, thereby contributing to prolonging the life of the piercing punch.

HYDRO-FORMING is one of the special machining methods of mechanical sheet metal that uses tube pressure (hydraulic pressure) at the room temperature (10 ℃ ~ 30 ℃) to expand the tube material. There is a great effect in reducing the weight of the press product and the molding cost, which are made up of combination of large and small single piece panels such as members.

In order to reduce the weight of the tube material applied to the hydroforming (HYDRO-FORMING) as described above, a high strength aluminum alloy is recently used in place of the iron-based material. In the case of such a high strength aluminum alloy, Iron material. However, after molding is secured through softening treatment before molding, hydroforming is performed step by step, and after forming into a product, its rigidity is secured through strengthening heat treatment.

1 and 2, the tube material 3 is loaded on the lower mold 2 of the hydroforming apparatus, and in the state where the upper mold 1 and the lower mold 2 are joined together, The axial punch 4 is advanced toward both ends of the tube material 3 by an axial feed device arranged at both ends of the tube material 3 to seal the axial direction of the tube material 3 And the assembly of the mold and the mounting of the actuator punch are completed.

In this state, the actuator punch 4 itself pressurizes and pressurizes the tube material 3 to supply liquid pressure to the inside of the tube material 3 along the forming surface formed in the upper die 1 and the lower die 2, (3) is subjected to expansion-molding to thereby effect hydroforming.

Thereafter, in order to perforate the hole on the bending portion, the piercing punch 5 provided on the upper die is advanced through the bending portion by the cylinder 5a, and a hole corresponding to the piercing punch 5 is drilled .

However, in the conventional piercing punch 5, as shown in Figs. 3A and 3B, the outer shape of the punch has a cylindrical shape with a uniform diameter as a whole, and when the punch is punched, its edge portion is largely deformed inward while the piercing punch A gap is formed between the hole and the peripheral edge of the tube member 3 and the fluid pressure oil in the tube member 3 is sprayed at a high pressure through the hole to thereby cause a problem that the hole is crushed by the pressure of the hydraulic fluid and the size of the hole is changed do.

In addition, due to the shape and dimensions of the changed hole, a pinched image is formed on the edge of the hole at the return of the piercing punch 5, which causes damage to the surface of the piercing punch, thereby shortening the service life.

Prior Art 1: Registered Patent Publication No. 10-0633707 (Registered Date: October 4, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punching punch for hydroforming, which prevents defective machining during hole processing by hydroforming and prevents the piercing punch from being pinched during return, thereby contributing to the prolongation of the life of the piercing punch.

According to the present invention, there is provided a punching punch for a hydroforming which is provided so as to be able to protrude and retract into a lower portion of an upper metal mold, wherein the punching portion of the punching punch includes a vertical portion having a constant outer diameter, There is provided a punching punch for hydroforming comprising an inclined portion whose outer diameter is gradually narrowed.

The punching unit may further include a fixture connected to the cylinder at an upper portion of the punching unit.

Preferably, the punching portion and the fixing body may be connected by a connecting rod that communicates with them at the same time.

Preferably, the magnetic body may include a magnetic body provided at the tip of the connecting rod.

Preferably, the connecting rod may be resiliently supported by a spring provided in the fixture.

Preferably, a chip collecting groove in which chips are collected may be formed in the tip of the inclined portion.

Preferably, it may include a magnetic body provided on an inner wall of the chip collecting groove.

According to the present invention, when the hole is formed by the hydroforming, the edge of the hole is bent along the inclined surface of the inclined portion by the inclined portion, thereby preventing the liquid seeping in the tube from being sprayed so that the hole can be prevented from being deformed, The dimensional accuracy of the hole can be increased.

In addition, the inclined portion can be smoothly drilled due to its sharpness at the time of hole machining, thereby improving workability.

Further, by preventing deformation of the hole, the punch can be smoothly drawn out from the hole at the return of the punch, and the occurrence of scratches is prevented, thereby contributing to the prolongation of the life.

Fig. 1 is a view for explaining hydroforming. Fig. 1
Fig. 2 is a view for explaining hydroforming. Fig. 2
Figs. 3a and 3b are views for explaining problems in hole machining of existing piercing punches
Fig. 4 is a sectional view of the punching punch for hydroforming according to the present invention
5 is a sectional view of the punching state of the punching punch for hydroforming according to the present invention
6 is an enlarged view of part A in Fig. 5

Hereinafter, preferred embodiments of the present invention will be described.

The terms used in the present invention are defined in consideration of the functions of the present invention and may vary depending on the intention or custom of the user or the operator. Therefore, the definitions of these terms are meant to be in accordance with the technical aspects of the present invention As well as the other.

In addition, optional terms in the following embodiments are used to distinguish one element from another element, and the element is not limited by the terms. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

FIG. 4 is a sectional view of a punching punch for hydroforming according to the present invention, FIG. 5 is a sectional view of punching punches for hydroforming according to the present invention, and FIG. 6 is an enlarged view of part A of FIG.

4 to 6, a punching punch 100 for hydroforming according to the present invention includes a tool (not shown) installed in a lower portion of an upper mold 1 so as to be capable of piercing holes on a tube material 3 and a punching unit 110. The punching unit 110 includes a vertical part 111 and an inclined part 112. As shown in FIG.

The vertical part 111 located at the upper part has a cylindrical shape with a constant diameter and the inclined part 112 is integrally provided at the lower part of the vertical part 111. The inclined part 112 is integrally provided at the lower part of the vertical part 111, .

In this manner, when the hole is machined, the inclined portion 112 penetrates the outer peripheral surface of the tube material 3 to form a hole. In this process, the tip of the edge of the hole is inclined by the inclined portion 112 112 to prevent the liquid seizure in the tube material 3 from being ejected. In addition, since the inclined portion 112 has a sharp angle with respect to the vertical portion 111, the perforation of the hole can be smoothly performed.

Here, the slope of the inclined portion 112 is preferably 1 to 2/100. If the slope is larger than this, the workability is improved, but the tip strength of the punch may become weak. If the slope is smaller than this, it is difficult to expect a different effect from the conventional cylindrical punching punch.

After the hole is punctured by the inclined portion 112, the vertical portion 111 enters the perforated hole and a complete hole is formed.

Meanwhile, a chip collecting groove 112a may be formed in the tip end of the inclined portion 112 to receive a chip generated when the hole is cut.

A magnetic body 113 to which collected chips are attached may be provided on the inner wall of the chip collection groove 112a. Since the chips generated during the hole cutting are collected in most of the chip collecting grooves 112a and are attached to the magnetic bodies 113, it is possible to prevent defects due to the incorporation of chips.

In addition, the piercing punch 100 of the present invention may further include a fixture 120 installed on the punching unit 110. The fixing member 120 serves as a body of the punching unit 110. The fixing unit 120 is coupled to an upper portion of a rod of a driving cylinder fixedly installed on the upper side of the upper mold 1, do.

Connection holes 113 and 121 are formed in the axial center portions of the fixing body 120 and the punching portion 110 and connecting rods 130 are contained in the connection holes 113 and 121 to connect the fixing body 120 and the punching portion 110).

When the punching unit 110 is damaged, the fixing unit 120 is coupled to the punching unit 110 so that the punching unit 110 can be easily attached or detached.

The connecting rod 130 may be elastically supported by a spring 131 installed in the connection hole 121 of the fixing body 120. This is a structure for securing a large chip collecting space while the chips are stacked to the tip (lower end) of the connecting rod 130 and pushed upward.

A magnetic body 132 may be provided at the tip of the connecting rod 130. This is a configuration for allowing the chips collected in the chip collecting groove 112a to remain therein without being discharged to the outside as in the case of the magnetic body provided in the punching unit 110 previously.

In the present invention, when the hole is processed by the hydroforming, the edge of the hole is bent by the inclined portion 112 along the inclined surface of the inclined portion 112 to prevent the liquid seizure in the tube material 3 from being ejected It is possible to prevent the deformation of the hole and further improve the dimensional accuracy of the hole and to draw the hole smoothly from the hole at the return of the punch due to the high precision of the hole machining and to prevent the occurrence of scratches, It is a useful invention to be contributed.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Piercing punch 111: Vertical part
112: inclined portion 120: fixed body
130: connecting rod 131: spring
132: magnetic body

Claims (7)

1. A punching punch for hydroforming,
Wherein the punching portion of the piercing punch comprises a vertical portion having a constant outer diameter and an inclined portion integrally provided at a lower portion of the vertical portion and having an outer diameter gradually becoming smaller downward.
The method according to claim 1,
And a fixing body connected to the cylinder at an upper portion of the punching portion.
The method of claim 2,
Wherein the punching portion and the fixing body are connected by a connecting rod that simultaneously communicates the punching portion and the fixing body.
The method of claim 3,
And a magnetic body provided at a tip end of the connecting rod.
The method of claim 3,
And the connecting rod is resiliently supported by a spring provided in the fixture.
The method according to claim 1,
And a chip collecting groove for collecting chips is formed in the tip end of the inclined portion.
The method of claim 6,
And a magnetic body provided on an inner wall of the chip collecting groove.
KR1020150185798A 2015-12-24 2015-12-24 Piercing punches for hydroforming KR101775878B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150185798A KR101775878B1 (en) 2015-12-24 2015-12-24 Piercing punches for hydroforming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150185798A KR101775878B1 (en) 2015-12-24 2015-12-24 Piercing punches for hydroforming

Publications (2)

Publication Number Publication Date
KR20170076054A true KR20170076054A (en) 2017-07-04
KR101775878B1 KR101775878B1 (en) 2017-09-07

Family

ID=59356690

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150185798A KR101775878B1 (en) 2015-12-24 2015-12-24 Piercing punches for hydroforming

Country Status (1)

Country Link
KR (1) KR101775878B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108687210A (en) * 2018-05-03 2018-10-23 哈尔滨工大海卓智能成形科技有限公司 A kind of metal internal high pressure forming part dimensional control methods and system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4713182B2 (en) * 2005-03-03 2011-06-29 住友金属工業株式会社 Hydropiercing method, apparatus used therefor, and hydropiercing processed product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108687210A (en) * 2018-05-03 2018-10-23 哈尔滨工大海卓智能成形科技有限公司 A kind of metal internal high pressure forming part dimensional control methods and system
US10940520B2 (en) 2018-05-03 2021-03-09 Harbin Institute Of Technology Method and system for controlling dimensions of metal hydroformed parts

Also Published As

Publication number Publication date
KR101775878B1 (en) 2017-09-07

Similar Documents

Publication Publication Date Title
JP6043230B2 (en) Manufacturing apparatus and manufacturing method for knuckle bracket
US10086423B2 (en) Method for forming a pressed component
EP4066957A1 (en) Mechanism and design for addressing ram droop
EP3912745A1 (en) Outboard hydrostatic bearing assembly for can bodymaker
CN104890046B (en) Electric wire threading slot punching mechanism
CN104399818B (en) A kind of drift separable internal spline diel
EP2470314A1 (en) Device, method and tool for producing a rimmed passage in a component
CN104096744A (en) Low-noise punching die
KR101213038B1 (en) Method of forming through-hole and through-hole forming machine
KR101775878B1 (en) Piercing punches for hydroforming
KR100638285B1 (en) Tube-insertion hole processing method of header pipe for regenerator
JP2008073732A (en) Die for half-blanking/burring
CN205147073U (en) A side cut cut -out press for processing installing support under rear bumper
JP2005297060A (en) Method for piercing hole by hydroforming method, piercing dies, and product manufactured by hydroforming method
JP2009279642A (en) Burring metallic mold, burring punch, and burring method
JP2008279458A (en) Method of manufacturing fastening nut
WO2007116820A1 (en) Method of drilling through hole in work peripheral wall and drilling device
JP5645527B2 (en) Punch die and screw hole machining method using the punch die
KR101382349B1 (en) Scrap ejecting apparatus of press mold
US20090229432A1 (en) Punching method using punch and punch for punching
JP2006187780A (en) Pressing machine
KR101852613B1 (en) Pierce punch for press die
JP2006192500A (en) Method and apparatus for boring through-hole on the circumferential wall of work
JP2000288653A (en) Combination piercing and riveter
JP2011078998A (en) Pierce punch

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant