CN103495617B - A kind of change wall thickness cylinder part Roll-extrusion forming device - Google Patents

Abstract

The invention belongs to metal precision plastic forming technology, in particular to a roll extrusion forming device for variable-wall-thickness cylinder parts. A roller extrusion molding device for variable wall thickness cylinder parts, the device is composed of upper and lower roller extrusion mechanisms, each layer includes a driving roller, two driven rollers meshed with the driving roller through bevel gears, Reset device: The reset device includes a cylinder, a rack, and a piston. In the same-layer rolling mechanism, the reset gear on the driving roller meshes with the rack, the rack is connected to the piston, and the piston is installed on the cylinder. The device of the invention encapsulates a two-layer roller extrusion mechanism, which can form a flash-free cylindrical part with variable wall thickness at one time, and can realize rapid and accurate forming of the part.

Description

A Roll Extrusion Forming Device for Variable Wall Thickness Cylindrical Parts

technical field

The invention belongs to metal precision plastic forming technology, in particular to a roll extrusion forming device for variable-wall-thickness cylinder parts.

Background technique

Most of the cylindrical parts with variable wall thickness are made of high-strength alloy steel. The traditional production method adopts the "pressing-punching-extension" process to form a straight-walled cylinder, and then machine cutting to process different wall thicknesses. The material utilization rate is extremely high. Low (40%), high tool consumption and high production costs. In addition, the method of powerful spinning can also form this kind of parts, but there are disadvantages such as many times of spinning, long production cycle, low production efficiency, and difficulty in releasing the cylinder from the mandrel after spinning. Therefore can't satisfy this part this product multi-species, the requirement of mass production.

At present, the best way is to adopt roll extrusion forming technology for variable wall thickness cylindrical parts, and realize the wall thickness reduction and axial elongation of the cylinder through the rolling of variable inner diameter rollers, so as to realize material saving, energy saving and high-efficiency production . In order to improve the service life of the roller in the roll extrusion process, it is necessary to set up flash grooves. However, the billet is generally high-strength alloy steel, and the generated flash is difficult to remove by mechanical processing. The method of secondary rolling extrusion can remove the flash, but the rolling forming is thermal deformation, and the temperature of the flash part drops rapidly. If the method of forming twice is used, it will not only affect the production efficiency, but also cause flashing due to insufficient deformation temperature. The edge parts are difficult to remove, and even have defects such as folding and breaking.

Contents of the invention

The technical problem to be solved by the present invention is: how to provide a roll extrusion forming device for variable-wall-thickness cylinder parts, so that the parts can be formed at one time, with high production efficiency and few defects.

The technical solution adopted in the present invention is: a roller extrusion molding device for variable wall thickness cylinder parts, the device is composed of upper and lower layers of roller extrusion mechanism, each layer includes a driving roller, and through the bevel gear and the driving roller Two meshing driven rollers and a reset device; the reset device includes a cylinder, a rack, and a piston. In the same-layer rolling mechanism, the reset gear on the driving roller meshes with the rack, and the rack is connected to the piston. The piston is installed on the On the cylinder; the circumferential surface of each roller of the two-layer roller extrusion mechanism is provided with a cavity corresponding to the shape of the cylinder with variable wall thickness, and the upper roller extrusion mechanism is provided with a flash groove at every pair of closed parts of the rollers , There are a total of three flash grooves at the two-two closed parts of the upper roller extrusion mechanism, and the two-two closed parts of the three rollers of the lower roller extrusion mechanism rotated 60 degrees are facing the two-two closed parts of the three rollers of the upper roller extrusion mechanism.

The beneficial effects of the present invention are: the device of the present invention encapsulates a two-layer roller extrusion mechanism, which can form a cylindrical part with variable wall thickness without flash at one time, and can realize rapid and accurate forming of the part; the composite mechanism of the present invention realizes rolling The automatic and precise reset of the wheel ensures the continuity of production.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the A-A view of Fig. 1;

Fig. 3 is the B-B view of Fig. 1;

Fig. 4 is a schematic diagram of the reset device of the present invention.

1. Rack, 2. Upper roller extrusion mechanism, 3. Lower roller extrusion mechanism, 4. Upper reset device, 5. Lower service device, 6. Upper roller closing part, 7. Middle part of lower roller, 8. Driven shaft, 9, driven roller, 10, flash groove, 11, driving shaft, 12, driving roller, 13, bevel gear, 14, rack, 15, piston, 16, cylinder, 17 reset gear.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the device of the present invention is divided into upper and lower layers, and each layer includes three parts of a roller, a frame, and a reset device. Among them, the upper roller extrusion mechanism has three flash grooves in the closed part of the rollers, and one flash groove is opened in every two closed parts, and the middle part of the lower roller is facing the closed part of the upper roller (two rollers intersect. The position of the three rollers of the lower roller extrusion mechanism rotates 60 degrees, and the two closed parts are facing the closed parts of the upper rollers. The upper and lower rollers correspond one by one. The driving shafts of the rolling mechanism are on the same vertical plane, the driving rollers of the upper rolling mechanism and the driving rollers of the lower rolling mechanism are on the same vertical plane, and the driven rollers of the upper rolling mechanism are in the same vertical plane as the driven rollers of the lower rolling mechanism. The two rollers are on the same vertical plane. During a rolling extrusion process, the billet passes through the two-layer rolling mechanism continuously under the drive of the punch. When passing through the upper mechanism (upper roller extrusion mechanism), the three rollers rotate inward synchronously under the action of the bevel gear to bite into the billet. When the punch drives the billet to move down, the axial compression and radial elongation of the billet can be realized by the rolling action of the rollers of the upper mechanism, because the mold cavity closed by the rollers is completely consistent with the shape of the cylindrical part with variable wall thickness. The same and there is a flash groove in the roll gap, so it can form a variable wall thickness cylindrical part with flash; when passing through the lower mechanism (lower roller extrusion mechanism), the three rollers of the lower roller extrusion mechanism are facing the blank The flash part. Due to the existence of flash, the extrusion deformation continues to occur when the punch drives the billet to move down. The mold cavity is not changed, and the deformation only occurs in the flash part, so that the flash is pushed to the bottom of the billet, and the flash-free variable-wall thickness cylindrical part can be obtained by removing the head.

As shown in Figure 4, the upper and lower reset device is mainly composed of a cylinder, a rack, and a reset gear. During the rolling process, the three rollers rotate inward synchronously and passively under the action of the bevel gear. The driving wheel drives the driving shaft to rotate through the bearing, and the driving shaft drives the reset gear to rotate synchronously, causing the rack to move, pushing the piston, Inflate the cylinder to realize the compression of the gas. After the rolling is completed, due to the loss of power, the compressed gas in the cylinder pushes the rack to move in reverse, driving the reset gear to rotate, realizing the reverse rotation of the driving wheel, and the driven wheel rotates in reverse through the bevel gear linkage. The cylinder is in a completely closed state, so the positive and negative movement strokes of the rack are the same, and the precise reset of the driving wheel can be realized. Since the driving wheel and the passive wheel adopt a one-to-two connection mode, the stroke error of the transmission can be effectively reduced, and the precise reset of the driven wheel can be realized.

The invention realizes the direct plastic forming of the parts, and replaces the subsequent mechanical cutting processing with precision plastic forming; simplifies the procedure and process, reduces the subsequent mechanical processing equipment, and reduces the production cost; saves the subsequent mechanical processing process, and can effectively improve the material quality. Utilization rate achieves high performance, high efficiency and low cost in the production of thick-walled cylinders with curved rotary shape, and is suitable for development and mass production of new products with multiple varieties and variable batches.

Claims (1)

1. become a wall thickness cylinder part Roll-extrusion forming device, it is characterized in that: this device is made up of upper and lower two-layer Gun Ji mechanism, every layer include an active roll, with two driven running rollers, resetting means being engaged with active roll by bevel gear; Resetting means comprises cylinder, tooth bar, piston, and in same Ceng Gunji mechanism, the reseting gear on active roll engages with tooth bar, and tooth bar connects piston, and piston is arranged on cylinder; Each running roller circumferential surface of two-layer Gun Ji mechanism offers the die cavity corresponding with becoming wall thickness cylindrical shell profile, upper strata Gun Ji mechanism all offers a flash gutters in the every closed location between two of running roller, and the closed location between two after Gun Ji mechanism of lower floor three running rollers rotate 60 degree is just to the closed location between two of upper strata Gun Ji mechanism three running rollers.