CN201098711Y

CN201098711Y - Sheet metal punching device

Info

Publication number: CN201098711Y
Application number: CNU2007200455962U
Authority: CN
Inventors: 马跃群; 郭俊映; 吴政道
Original assignee: Mitac Precision Technology Kunshan Ltd
Current assignee: Mitac Precision Technology Kunshan Ltd
Priority date: 2007-08-28
Filing date: 2007-08-28
Publication date: 2008-08-13
Anticipated expiration: 2017-08-28

Abstract

A metal plate stamping device at least comprises a convex die, a concave die opposite to the convex die, and a blank holder sheathed on the outside of the convex die for butting against and fixing the metal plate on the surface of the convex die. The metal plate stamping device also comprises a high-energy pulse power supply, which is connected with the blank holder and the concave die at both terminals or connected with the blank holder and the concave die for applying the high-energy current among the convex die, the metal plate and the concave die or among the blank holder, the metal plate and the concave die, thereby achieving electro-plasticity effect in the metal plate stamping process, obviating heating the entire mold, reducing the power consumption and achieving less mold deformation. Due to the electro-plasticity effect of the high-energy continuous pulse current, the deformed region of the metal plate is dynamically recrystallized to achieve fine grains, thereby greatly improving the stamping yield of the metal plate.

Description

The metallic plate punching device

[technical field]

The relevant a kind of metallic plate punching device of the utility model is meant the decompressor that is applied to the punching press magnesium alloy plate especially.

[background technology]

Magnesium alloy is used for aviation and spacecraft etc. as the obdurability material of light weight, good rigidly, can increase payload and flying distance, reduces life cycle and cost.In addition, because magnesium alloy density is less and have a good electromagnetic wave shielding, therefore it is widely used in consumption electronic products, as mobile phone, digital camera is first-class, but existing process technology adopts the mode of die casting or punching press more, adopt casting die to exist the strength and stiffness of die casting low, the little shortcomings such as (being unfavorable for ELECTRONIC SCREENING EFFECT IN) of density, and because the plasticity under the magnesium alloy normal temperature is very poor, embrittlement easily, be difficult to carry out Plastic Forming processing, and magnesium alloy is when being shaped more than 200 ℃, its plasticity obviously improves, and therefore can utilize the mode of punching press to be shaped, therefore in the design of diel, must put in order heating to mould, and rely on heat conducting mode to improve temperature and final its ductility in punching course that improves of magnesium alloy plate.The weak point of this kind mode is that it not only can consume a lot of energy on mould, and the temperature control hysteresis is serious, and expanding with heat and contract with cold of mould brought more difficulty to Mould Machining or refine; In addition, magnesium alloy parts causes dimensional contraction and torsional deformation phenomenon greatly because of thermograde easily before and after punch process.

[summary of the invention]

The utility model purpose is to provide a kind of metallic plate punching device, and it need not be provided with mold heating device, thereby reduces energy resource consumption and Mould Machining and maintenance difficulty, and is beneficial to the maintenance product quality.

For reaching above-mentioned purpose, the utility model provides a kind of metallic plate punching device, at least comprise punch, the die relative with punch, and the outside of punch is arranged with blank holder, in order to being compressed, sheet metal is fixed in the die surface, and this metallic plate punching device also comprises a high energy pulse power supply, and its two poles of the earth electrically connect with punch and die respectively.

For reaching above-mentioned purpose, the utility model also provides a kind of metallic plate punching device, at least comprise punch, the die relative with punch, and the outside of punch is arranged with blank holder, in order to being compressed, sheet metal is fixed in the die surface, and this metallic plate punching device also comprises a high energy pulse power supply, and its two poles of the earth electrically connect with blank holder and die respectively.

Compared with prior art, the utility model is by being added in the high energy pulse electric current between punch-sheet metal-die, perhaps between blank holder-sheet metal-die, realized the Electroplastic effect in the metallic plate punching process, therefore needn't heat mold integral, so power consumption is little, the die deformation amount is little, and because the Electroplastic effect of high energy continuous impulse electric current, the sheet metal deformed area has significantly improved the yield that metallic plate punching is shaped owing to dynamic recrystallization has obtained grain refinement.

For making the purpose of this utility model, structural feature and function thereof there are further understanding, cooperate diagram to be described in detail as follows now:

[description of drawings]

Fig. 1 is for implementing the structural representation of metallic plate punching device of the present utility model.

Fig. 2 is the structural representation of another embodiment of enforcement metallic plate punching device of the present utility model.

[specific embodiment]

See also shown in Figure 1, for implementing the structural representation of metallic plate punching device of the present utility model, this metallic plate punching device 1 comprises a punch 10 at least, the die 11 relative with punch 10, and the outside of punch 10 is arranged with blank holder 12, in order to being compressed, sheet metal 13 is fixed in die 11 surfaces, and this metallic plate punching device 1 also comprises a high energy pulse power supply 14, its the two poles of the earth 140,141 electrically connect with punch 10 and die 11 respectively, clearer for what its course of action was understood, describe below in conjunction with the detailed process of utilizing this metallic plate punching device that the magnesium alloy plate of 0.4mm is processed:

The first, die 11 is sprayed high-temperature lubricant at the edge of fillet place relative with punch 10 and blank holder 12 contiguous punch 10, as nano-graphite breast or polytetrafluoroethylene (PTFE);

The second, magnesium alloy plate is placed on stamping position, blank holder 12 falls and controls and forms closely contact between blank holder 12, magnesium alloy plate and die 11 upper surfaces;

Three, control punch 10 falls with the speed of 0.5mm/s, connects high energy pulse power supply 14 when punch 10 lower surfaces touch the magnesium alloy plate surface, and punch 10 continues at the uniform velocity to fall, and finishes until punching press;

Four, stop high energy pulse power supply 14, shaped article is taken out in die sinking.

See also shown in Figure 2, structural representation for another embodiment of implementing metallic plate punching device of the present utility model, this metallic plate punching device 2 comprises a punch 20 at least, the die 21 relative with punch 20, and the outside of punch 20 is arranged with blank holder 22, in order to being compressed, sheet metal 23 is fixed in die 21 surfaces, and this metallic plate punching device 2 also comprises a high energy pulse power supply 24, its the two poles of the earth 240,241 electrically connect with blank holder 22 and die 21 respectively, clearer for what its course of action was understood, describe below in conjunction with the detailed process of utilizing this metallic plate punching device that the magnesium alloy plate of 0.6mm is processed:

The first, die 21 is sprayed high-temperature lubricant at the edge of fillet place relative with punch 20 and blank holder 22 contiguous punch 20, as nano-graphite breast or polytetrafluoroethylene (PTFE);

The second, magnesium alloy plate is placed on stamping position, blank holder 22 falls and controls and forms closely contact between blank holder 22, magnesium alloy plate and die 21 upper surfaces;

Three, control punch 20 falls with the speed of 0.5mm/s, connects high energy pulse power supply 24 when punch 20 lower surfaces during apart from magnesium alloy plate top 1mm, and punch 20 continues at the uniform velocity to fall, and finishes until punching press:

Four, stop high energy pulse power supply 24, shaped article is taken out in die sinking.

Compared with prior art, the utility model is by being added in the high energy pulse electric current between the punch 10-sheet metal 13-die 11, perhaps between the blank holder 22-sheet metal 23-die 21, realized the Electroplastic effect in the metallic plate punching process, therefore needn't heat mold integral, so power consumption is little, the die deformation amount is little, and because the Electroplastic effect of high energy continuous impulse electric current, the sheet metal deformed area has significantly improved the yield that metallic plate punching is shaped owing to dynamic recrystallization has obtained grain refinement.

Claims

1, a kind of metallic plate punching device, at least comprise punch, the die relative with punch, and the outside of punch is arranged with in order to sheet metal is compressed the blank holder that is fixed in the die surface, it is characterized in that this metallic plate punching device also comprises a high energy pulse power supply, its two poles of the earth electrically connect with punch and die respectively.

2, metallic plate punching device as claimed in claim 1 is characterized in that: this sheet metal is a magnesium alloy plate, and this die scribbles high-temperature lubricant at the edge of fillet place relative with punch and the contiguous punch of blank holder.

3, metallic plate punching device as claimed in claim 2 is characterized in that: this high-temperature lubricant is nano-graphite breast or polytetrafluoroethylene (PTFE).

4, a kind of metallic plate punching device, at least comprise punch, the die relative with punch, and the outside of punch is arranged with in order to sheet metal is compressed the blank holder that is fixed in the die surface, it is characterized in that this metallic plate punching device also comprises a high energy pulse power supply, its two poles of the earth electrically connect with blank holder and die respectively.

5, metallic plate punching device as claimed in claim 4 is characterized in that: this sheet metal is a magnesium alloy plate, and this die scribbles high-temperature lubricant at the edge of fillet place relative with punch and the contiguous punch of blank holder.

6, metallic plate punching device as claimed in claim 5 is characterized in that: this high-temperature lubricant is nano-graphite breast or polytetrafluoroethylene (PTFE).