CN104289545B - A kind of electric-liquid type flutter platform for cold extrusion vibration machining - Google Patents

Abstract

An electro-hydraulic flutter table for cold extrusion vibration processing, including a cylinder, a piston, a piston rod, a mold base connected to a mold, and a cylinder base connected to a hydraulic press. The upper end of the piston rod is fixedly connected to the mold base, and the piston The rod passes through the central through hole of the cylinder top cover, the piston and the cylinder base successively from top to bottom. The seal is fixed on the upper and lower ends of the cylinder; the piston rod is in dynamic sealing fit with the top cover of the cylinder and the base of the cylinder; the outer ring of the piston is in tight fit with the inner wall of the cylinder; The first oil port P1 and the second oil port P2, the first oil port P1 communicates with the upper chamber where the groove above the piston is located, and the second oil port P2 communicates with the lower chamber where the groove below the piston is located. The invention can provide sufficiently large excitation force, controllable frequency and amplitude.

Description

An electro-hydraulic chatter table for cold extrusion vibration processing

technical field

The invention belongs to the technical field of cold extrusion, in particular to a vibration table used for cold extrusion vibration processing.

Background technique

Because cold extrusion has many advantages such as "high production efficiency, high material utilization rate, and good part performance", it has been widely used in industrial production. However, during cold extrusion processing, due to the high flow stress of the material at room temperature, the deformation resistance rises sharply when the billet is formed, and the friction between the mold and the billet also hinders the flow of the metal billet. Not only that, the high Deformation resistance and friction have stricter requirements on the tonnage of the press and the mold.

With the continuous exploration of this problem, people have found that introducing high-frequency vibration into the forming process of wire and pipe drawing can effectively reduce the forming force. At present, as a high-frequency vibration source, high-power ultrasonic is mainly used. Due to the limitation of ultrasonic power, it cannot provide a large enough output force. Therefore, it cannot meet the extrusion requirements of large-sized and complex-shaped parts.

The vibration method based on hydraulic drive can provide a sufficient excitation force. One of the forms is to force the top plate of the vibration cylinder to undergo elastic deformation through oil pressure to achieve vibration. However, the amount of elastic deformation of the metal cannot be precisely controlled, resulting in vibration. The amplitude cannot be predicted and controlled, which hinders and limits the actual research and application of cold extrusion vibration processing.

Contents of the invention

In order to overcome the problems of insufficient output excitation force and uncontrollable amplitude of the existing vibration mode based on hydraulic drive, the present invention provides a vibration process for cold extrusion that can provide sufficient excitation force and controllable frequency and amplitude. electrohydraulic flutter table.

The technical solution adopted by the present invention to solve its technical problems is:

An electro-hydraulic flutter table for cold extrusion vibration processing, including a cylinder, a piston, a piston rod, a mold base connected to a mold, and a cylinder base connected to a hydraulic press. The upper end of the piston rod is connected to the mold base Fixed connection, the piston rod passes through the central through hole of the cylinder top cover, the piston and the cylinder base in turn from top to bottom, the piston is sealed and fixed on the piston rod, and the upper and lower sides of the piston have symmetrical Groove, the cylinder top cover and the cylinder base are respectively sealed and fixed on the upper and lower ends of the cylinder; the piston rod is dynamically sealed with the cylinder top cover and the cylinder base, and the outer ring of the piston is in contact with the cylinder base. The inner walls of the cylinder are sealed and fit, and the upper and lower ends of the side of the cylinder are respectively provided with a first oil port P1 and a second oil port P2. The first oil port P1 and the upper groove of the piston are located The second oil port P2 communicates with the lower chamber where the groove below the piston is located.

Further, the piston rod, the cylinder top cover, and the cylinder base all adopt a dustproof ring, a combined seal and a support ring structure. The dynamic sealing is realized by adopting this method, and of course, other sealing methods can also be used.

Still further, the piston rod and the upper end of the piston are fixed by the shoulder of the piston rod, and the piston rod and the lower end of the piston are fixed by a round nut and a stop washer.

Furthermore, the piston rod is nested in the groove under the mold base, the end of the piston rod is provided with a threaded hole for fixed connection with the mold base, and the fixing bolt is installed in the threaded hole.

An O-ring seal is used between the piston rod and the piston, and an O-ring seal is used between the cylinder top cover, the cylinder base and the cylinder respectively.

The diameter of the shaft section that the piston rod cooperates with the mold base is larger than the diameter of the central hole of the cylinder top cover.

The technical concept of the present invention is: the piston rod is provided with a central through hole, which can meet the requirement that the hydraulic machine ejector rod passes through the entire flutter platform device to complete the ejection work; the diameter of the connecting shaft section between the piston rod and the mold base is larger than the center of the cylinder top cover The diameter of the hole can be used as a limit structure for the downward movement of the piston rod to prevent the piston from blocking the lower oil port; Small movements will not affect the sealing effect.

When working, the oil enters from the two oil ports on the side of the cylinder and fills the oil cavity of the cylinder. Due to the seal between the piston and the cylinder, and between the piston and the piston rod, the oil cavity of the cylinder is separated into upper and lower parts by the piston. The upper and lower oil ports are connected with the hydraulic control valve; by inputting the vibration signal of the specified parameters to the hydraulic control valve, the oil pressure in the upper and lower oil chambers of the cylinder can be adjusted, and the piston and the piston rod are under the action of the pressure difference between the upper and lower oil chambers. Slight reciprocating motion is carried out in the cylinder, one end of the mold base is fixedly connected with the piston rod, and the other end is fixedly connected with the cold extrusion die, which can realize the transmission of vibration from the flutter platform to the cold extrusion die.

The beneficial effects of the present invention are mainly manifested in that it can provide sufficiently large vibration output force, controllable vibration frequency and amplitude, and can meet the needs of cold extrusion processing and jacking operations.

Description of drawings

Figure 1 is a structural diagram of an electro-hydraulic chatter table for cold extrusion vibration processing.

Figure 2 is a top view of the electro-hydraulic flutter table.

Figure 3 is a diagram of the piston rod seal.

Figure 4 is a diagram of the piston seal.

Figure 5 is a schematic diagram of the working principle of the electro-hydraulic flutter table.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 5, an electro-hydraulic flutter table for cold extrusion vibration processing, including a cylinder 5, a piston 4, a piston rod 2, a mold base 1 connected to a mold, and a cylinder base 6 connected to a hydraulic press , the upper end of the piston rod 2 is fixedly connected with the mold base 1, and the piston rod 2 passes through the central through hole of the cylinder top cover 3, the piston 4 and the cylinder base 6 sequentially from top to bottom, and the piston 4 sealed and fixed on the piston rod 2, symmetrical grooves are opened on the upper and lower sides of the piston 4, and the cylinder top cover 3 and the cylinder base 6 are respectively sealed and fixed on the upper and lower ends of the cylinder 5;

The piston rod 2 is in dynamic sealing cooperation with the cylinder top cover 3 and the cylinder base 6, the outer ring of the piston 4 is in sealing cooperation with the inner wall of the cylinder 5, and the upper and lower ends of the side of the cylinder 5 are respectively There is a first oil port P1 and a second oil port P2, the first oil port P1 communicates with the upper chamber where the groove above the piston is located, and the second oil port P2 communicates with the groove below the piston The lower cavity where it is located communicates.

The diameter of the shaft section where the piston rod 2 cooperates with the mold base 1 is greater than the diameter of the central hole of the cylinder top cover 3 . It can be used as a limit structure for the downward movement of the piston rod to prevent the piston from blocking the lower oil port.

1 and 2, the piston rod 2 is nested in the groove under the mold base 1, and the end of the piston rod 2 is provided with a threaded hole for fixed connection with the mold base 1. Piston rod 2 passes through the central through hole of cylinder top cover 3, piston 4 and cylinder base 6 sequentially from top to bottom. There are symmetrical grooves on the upper and lower sides of piston 4. The shaft shoulder is fixed, and the lower end is fixed with a round nut 8 and a stop washer 7. Both the cylinder top cover 3 and the cylinder base 6 are provided with bosses for nesting and fitting on the upper and lower ends of the cylinder 5, and are welded and fixed to the cylinder 5 respectively.

Referring to Figure 3-4, the sealing structure of the electro-hydraulic flutter table. A dustproof ring 9, a combined seal 10 and a support ring 11 are used between the piston rod 2 and the cylinder top cover 3 and the cylinder base 6, and a support ring 12 and a combined seal 13 are used between the piston 4 and the cylinder 5. In addition, the piston rod 2 and the piston 4 are sealed with an O-ring, and the cylinder top cover 3, cylinder base 6 and cylinder 5 are also sealed with an O-ring.

Figure 5 is a schematic diagram of the working principle of the electro-hydraulic flutter table. The electro-hydraulic flutter table is installed and fixed on the hydraulic press platform 17 through the cylinder base 6 and bolts 18. The ejector rod 15 at the bottom of the hydraulic press can realize ejection through the central through hole of the piston rod 2. The die 14 of the cold extrusion die passes through the Bolt 19 is installed and fixed on the mold base of the flutter table. Oil port P1 and oil port P2 are respectively provided at the upper and lower ends of the side of the cylinder. The two oil ports are respectively connected to the inlet and outlet oil passages of the hydraulic control valve 16. By inputting the vibration signal of specified parameters to the hydraulic control valve 16, the hydraulic control valve 16 can control the oil to continuously enter and exit the upper and lower oil chambers of the flutter cylinder through the oil port P1 and the oil port P2, so that a A certain pressure difference forces the piston 4 to reciprocate slightly up and down, and the piston rod 2 fixedly connected to the piston 4 transmits the vibration to the mold base 1 and the cold extrusion die 14, realizing the vibration processing of cold extrusion .

Claims (6)

1. a cold extrusion vibration machining electric-liquid type flutter platform, it is characterized in that: the cylinder barrel base comprising cylinder barrel, piston, piston rod, the mold base be connected with mould and be connected with hydraulic press, the upper end of described piston rod is fixedly connected with described mold base, described piston rod is from top to bottom successively through the central through hole of cylinder barrel top cover, piston and cylinder barrel base, described piston seal is fixed on described piston rod, the upper and lower surface of described piston has symmetrical grooves, and described cylinder barrel top cover and cylinder barrel base seal the two ends being up and down fixed on cylinder barrel respectively;

Described piston rod coordinates with movable sealing between cylinder barrel top cover, cylinder barrel base, be sealed and matched between the outer ring of described piston and the inwall of cylinder barrel, upper and lower two ends, described cylinder barrel side are respectively equipped with the first hydraulic fluid port P1 and the second hydraulic fluid port P2, described first hydraulic fluid port P1 is communicated with the epicoele at the groove place above described piston, and described second hydraulic fluid port P2 is communicated with the cavity of resorption at the groove place below described piston.

2. cold extrusion vibration machining electric-liquid type flutter platform as claimed in claim 1, is characterized in that: all adopt dust ring, combination sealing and supporting ring structure between described piston rod and cylinder barrel top cover, cylinder barrel base.

3. cold extrusion vibration machining electric-liquid type flutter platform as claimed in claim 1 or 2, is characterized in that: described piston rod and piston upper end are fixed by the shaft shoulder of piston rod, and described piston rod and piston adopt round nut and stop washer to fix.

4. cold extrusion vibration machining electric-liquid type flutter platform as claimed in claim 1 or 2, it is characterized in that: described piston rod is nested in the groove below mold base, piston rod end is provided with screwed hole for being fixedly connected with mold base, and set bolt is arranged in described screwed hole.

5. cold extrusion vibration machining electric-liquid type flutter platform as claimed in claim 1 or 2, is characterized in that: adopt O type circle to seal between described piston rod and described piston, described cylinder barrel top cover, adopts O type circle to seal between cylinder barrel base and cylinder barrel respectively.

6. cold extrusion vibration machining electric-liquid type flutter platform as claimed in claim 1 or 2, is characterized in that: the be connected diameter of shaft part of described piston rod and mold base is greater than the diameter of cylinder barrel top cap central bore.