CN206527201U - A kind of Analysis of Hydraulic Bulging Test of Sheet Metals device - Google Patents

Abstract

A sheet metal hydraulic bulging device, including upper and lower molds, the upper mold is connected with a blank holder cylinder, the inner cavity of the lower mold is a cavity that is consistent with the shape of the thin-walled deep-cavity plate part to be formed, and the upper mold is equipped with a corresponding The liquid chamber communicates with the oil inlet channel and the oil outlet channel respectively located on both sides of the upper mold; the bottom of the lower mold cavity is a large through hole that communicates with the cavity and has the same cross section as the cavity. The back-pressing mold is slidingly installed inside. The shape of the upper surface of the back-pressing mold is consistent with the shape of the bottom surface of the thin-walled deep-cavity plate part to be formed. The lower part of the back-pressing mold is connected with the ejection cylinder, and its telescopic stroke is controlled by the ejection cylinder. The bulging device can solve the problem of excessive thinning caused by the stress concentration in the central part of the suspended area of the plate during the hydraulic bulging process of the plate, effectively avoid the phenomenon of material rupture, improve the bulging depth and forming quality of the product, and use it to make The method of deep cavity plate parts is simple to operate, easy to control, saves materials and has high efficiency.

Description

A sheet metal hydraulic bulging device

technical field

The utility model belongs to the technical field of mechanical processing, and relates to a plate processing device, in particular to a plate hydraulic bulging device for making deep-cavity plate parts.

Background technique

In the modern manufacturing industry, it is often necessary to produce some plate parts with complex structure and size. Due to the characteristics of short production cycle, less production process, small number of molds and high forming quality, the hydraulic bulging technology is suitable for the production of small batches and complex sizes. Parts have their unique advantages, which not only meet the diversified needs of market products, but also greatly reduce production costs.

However, in the existing hydraulic bulging technology, due to the following deficiencies in the bulging stage, the production of plate members with a large bulging depth is greatly limited:

1. During the hydraulic bulging process of the plate, the plate is in a suspended state before it is attached to the lower mold, the deformation in the middle part is the largest, and the stress is also the most concentrated. When it is necessary to obtain a deep cavity-shaped part with a large bulging depth, here Often ruptures;

2. During the hydraulic bulging process of the sheet metal, it is difficult to add radial feed force in the radial direction of the sheet to carry out radial feeding, and the frictional resistance generated by the blank holder also greatly reduces the flow speed of the sheet itself. When liquid is injected into the liquid chamber and increases At the same time as the hydraulic pressure, the deformation of the plate in the suspended area increases suddenly. At this time, the material in the blank-holding area of the plate is still slowly flowing to the middle, and the plate in the suspended area will gradually become thinner and rupture due to the excessive bulging speed.

Utility model content

The purpose of the utility model is to provide a plate hydraulic bulging device to overcome the shortcomings of the above-mentioned prior art.

The technical solution adopted by the utility model is: a plate hydraulic bulging device, including an upper mold and a lower mold, the upper mold is connected with a blank holder cylinder, and the inner cavity of the lower mold is consistent with the shape of the thin-walled deep-cavity plate parts to be formed The upper mold is provided with a liquid chamber corresponding to the cavity, and the liquid chamber communicates with the oil inlet channel and the oil outlet channel on both sides of the upper mold. The cross-sectional size of the opening at the bottom of the liquid chamber is consistent with the cross-sectional size of the cavity. ;

The bottom of the cavity of the lower mold is a large through hole that communicates with the cavity and has the same cross section as the cavity. A back pressure die is slidably installed in the large through hole. The shape of the bottom surface of the cavity plate parts is consistent, and the lower part of the back pressure mold is connected with the ejection cylinder, and its telescopic stroke is controlled by the ejection cylinder.

Its further technical solution is: a first sealing ring is provided between the bottom surface of the upper mold and the plate blank, the first sealing ring is installed in the sealing groove around the liquid chamber on the bottom surface of the upper mold, and the large through hole of the lower mold A second sealing ring is arranged between the wall and the side wall of the back pressure mold, and the second sealing ring is installed in the sealing groove of the wall of the large through hole.

Furthermore: the ports of the oil inlet passage and the oil outlet passage are provided with stepped holes, and the oil inlet passage and the oil outlet passage are connected to the external flange through the stepped holes at the ports.

Due to the adoption of the above technical scheme, a hydraulic bulging device of the utility model has the following beneficial effects:

1. A sheet metal hydraulic bulging device of the utility model has a large through hole in the lower part of the lower mold cavity, and a back pressure die is installed in the through hole. The side wall of the back pressure die can slide relatively along the hole wall of the through hole. Connection, by controlling the up and down travel of the back press die to control the real-time forming changes of the plate, it can increase the time for the material flow in the blank-holding area of the plate, so as to get more feeding: the back press die is fixed at the position close to the plate at the initial stage of forming, Under the action of high hydraulic pressure, the plate is bonded to the back pressure die, and the plate is stretched downward as the position of the back pressure die decreases in the later stage. Due to the "friction holding" between the plate and the back pressure die, the stress concentration at the center of the plate is obtained. Greatly reduced, so as to solve the problem of excessive thinning caused by the stress concentration in the central part of the suspended area of the plate during the hydraulic bulging process, effectively avoid the phenomenon of material rupture, improve the bulging depth and forming quality of the product, and form a higher Sheet parts with bulging ratio;

2. The method of making deep-cavity plate parts with a plate hydraulic bulging device of the utility model is simple to operate and easy to control, can effectively reduce the thinning rate of hydraulic bulging parts, and save materials on the premise of ensuring product quality. Processing saves procedures and improves production efficiency;

3. A hydraulic bulging device of the utility model uses a special blank-holding cylinder for blank-holding, which can provide the required blank-holding force and can be adjusted, and uses a special ejector cylinder to control the stroke of the ejector cylinder. The position of the back press mold ensures the accuracy of the processing process;

4. A plate hydraulic bulging device of the utility model has good sealing performance and can effectively prevent liquid leakage:

The oil inlet and outlet are designed with stepped holes to connect with the external flange to ensure good sealing of the oil port;

There is a first sealing ring between the bottom surface of the upper mold and the plate, which can prevent the oil in the liquid chamber of the upper mold from leaking during the forming process;

A second sealing ring is arranged between the side wall of the back pressure die and the hole wall of the through hole of the lower die, which can prevent oil leakage caused by the rupture of the plate.

The technical features of a plate hydraulic bulging device of the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Figures 1 to 3 are structural schematic diagrams of a plate hydraulic bulging device of the present invention (including plate blanks):

Figure 1 is a schematic diagram of the initial implementation process of hydraulic bulging, Figure 2 is a schematic diagram of the intermediate implementation process of hydraulic bulging, and Figure 3 is a schematic diagram of the final implementation process of hydraulic bulging.

In the picture:

1—edge cylinder, 2—upper mold, 21—liquid chamber, 22—oil inlet channel, 221—step hole, 23—oil outlet channel, 231—step hole, 3—sheet blank, 4—lower mold, 41 —large through hole, 5—back pressure mold, 6—ejection cylinder, 7—first sealing ring, 8—second sealing ring.

detailed description

Example

A sheet metal hydraulic bulging device, comprising an upper mold 2 and a lower mold 4, the upper mold is connected to a blank holder cylinder 1, the inner cavity of the lower mold is a cavity that is consistent with the shape of the thin-walled deep-cavity plate part to be formed, and the upper mold There is a liquid chamber 21 corresponding to the cavity, which communicates with the oil inlet channel 22 and the oil outlet channel 23 respectively located on both sides of the upper mold. The cross-sectional size of the bottom opening of the liquid chamber is consistent with the cross-sectional size of the cavity. , When the lower mold is closed, the opening of the liquid chamber is directly opposite to the cavity;

The bottom of the lower mold cavity is a large through hole 41 that communicates with the cavity and has the same cross section as the cavity cross section. A back pressure die 5 is installed in the large through hole, and the back pressure die is slidably matched with the inner wall of the large through hole. The shape of the upper surface is consistent with the shape of the bottom surface of the thin-walled deep-cavity plate part to be formed, and the lower part of the back pressure mold is connected with the ejector cylinder 6, and its telescopic stroke is controlled by the ejector cylinder.

A first sealing ring 7 is arranged between the bottom surface of the upper mold and the plate blank, and the first sealing ring is installed in the sealing groove around the liquid chamber on the bottom surface of the upper mold. A second sealing ring 8 is arranged between the walls, and the second sealing ring is installed in the sealing groove of the wall of the large through hole.

The ports of the oil inlet passage and the oil outlet passage are provided with stepped holes, and the oil inlet passage and the oil outlet passage are connected to the external flange through the stepped holes at the ports.

The steps of the method for making thin-walled deep-cavity plate parts using one of the above-mentioned hydraulic bulging devices for plates are as follows:

(1) Install the sheet blank: place the sheet blank 3 between the upper mold 2 and the lower mold 4, control the blank holder cylinder 1 to apply a blankholder force to the upper mold 2 to clamp the sheet blank;

(2) Exhaust oil filling: input pressure oil through the oil inlet channel 22, discharge the air in the liquid chamber 21 from the oil outlet channel 23, fill the liquid chamber with pressure oil, and close the oil outlet channel 23;

(3) Control the upward movement of the ejector cylinder 6 so that the back pressure die 5 is close to the bottom surface of the sheet blank;

(4) Initial die attaching: applying hydraulic pressure to the liquid chamber through the oil inlet channel 22, under the action of the hydraulic pressure, the plate blank is bulged and initially attached to the upper surface of the back pressure die (see Figure 2);

(5) Die drawing forming: After the initial mold attachment is completed, the ejector cylinder 6 is controlled to drive the back pressure die 5 to slowly descend to the required bulging depth. At this time, the material in the blank holder area of the sheet blank is slowly replenished to the center. Make the lower part of the plate blank close to the upper surface of the back pressure die 5, and preliminarily form the plate part (see Figure 3);

(6) Pressure maintenance: keep the hydraulic pressure of the liquid chamber 21 at the set hydraulic pressure value, at this time, due to the "friction holding" effect, the stress concentration in the center of the plate part can be greatly reduced;

(7) Pressure relief and oil discharge and mold opening: Finally, the high pressure in the liquid chamber is released, the oil in the liquid chamber 21 is removed through the oil outlet channel 23, and the mold is opened to obtain a thin-walled deep-cavity plate part with a required bulging depth.

Claims (3)

1. a kind of Analysis of Hydraulic Bulging Test of Sheet Metals device, including mold（2）With lower mould（4）, the mold and flanging cylinder（1）Even Connect, lower dies cavity is the corresponding die cavity of the deep cavity plate material part shape of thin-walled of the shaping with needed for, and mold is provided with and die cavity pair The liquid room answered（21）, liquid room and the oil inlet passage for being divided into mold both sides（22）And oil discharge passage（23）Connection, liquid room bottom The cross sectional dimensions of opening is consistent with die cavity cross sectional dimensions；

It is characterized in that：The lower mold cavity bottom is to be communicated with die cavity and cross section and die cavity cross section identical large through-hole （41）, be slidably installed in large through-hole back pressure mould（5）, the shape of the upper surface of the back pressure mould and the deep cavity plate of thin-walled of required shaping The shape of material part bottom surface is consistent, back pressure mould bottom and liftout tank（6）Connect and its flexible stroke is controlled by liftout tank.

2. a kind of Analysis of Hydraulic Bulging Test of Sheet Metals device as claimed in claim 1, it is characterised in that：The mold bottom surface and sheet material base The first sealing ring is provided between part（7）, the first sealing ring is arranged on mold bottom surface in the seal groove around liquid room, described The second sealing ring is provided between lower mould large through-hole hole wall and back of the body die-side wall（8）, the second sealing ring is installed in large through-hole hole wall Seal groove in.

3. a kind of Analysis of Hydraulic Bulging Test of Sheet Metals device as claimed in claim 2, it is characterised in that：The oil inlet passage and oil discharge passage Port be provided with shoulder hole, oil inlet passage is connected with oil discharge passage by the shoulder hole of its port with external flanges.