CN111283994B

CN111283994B - Machining device and machining method for inner rib cylinder

Info

Publication number: CN111283994B
Application number: CN202010214931.7A
Authority: CN
Inventors: 朱成成; 汪学斌; 孟德安; 黄浩
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2021-11-30
Anticipated expiration: 2040-03-24
Also published as: CN111283994A

Abstract

The invention discloses a processing device and a processing method of an inner rib cylinder, and belongs to the field of plastic processing of materials. According to the processing method of the processing device utilizing the inner rib cylinder, the elastic sliding die is rolled on the cylindrical blank, the inner rib can be formed in the cylinder body at one time, in the processing process, the cylindrical blank is locally deformed, deformation is generated along with the contact of the sliding die teeth of the elastic sliding die and the cylindrical blank, and wall thickness reduction and inner rib filling are completed at the same time.

Description

Machining device and machining method for inner rib cylinder

Technical Field

The invention belongs to the field of plastic processing of materials, and particularly relates to a processing device and a processing method of an inner rib cylinder.

Background

The large thin-wall cylinder with longitudinal inner ribs is a main component of a fuel tank and an engine shell of a carrier rocket. The parts have the characteristics of large diameter, thin wall thickness and high requirements on processing precision and quality, so the manufacturing difficulty is extremely high, and the parts are a typical neck clamping technology in the aerospace industry. The large thin-wall cylinder of the heavy rocket generally uses the inner ribs with T-shaped, L-shaped and other complex sections, and the processing difficulty is further increased compared with the common rectangular inner rib.

At present, only two effective methods are available at home and abroad for processing the parts, namely a process route of roll bending forming + chemical milling + welding or a process route of high-speed numerical control milling + equidistant bending forming + welding, and the two processing methods have the defects of complex process, low production efficiency, difficult quality guarantee, high cost, serious material and energy waste and the like.

Disclosure of Invention

The invention aims to solve the problems of low production efficiency, high cost and unreliable quality of the existing processing technology of the existing large-sized inner rib cylinder, and provides a processing device and a processing method of the inner rib cylinder.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a processing device of an inner rib cylinder comprises a bottom plate, an outer die cylinder, an elastic sliding die and a cylinder body blank;

the elastic slip form is annular and continuously shrinks from the upper end face to the lower end face, the outer diameter of the upper end face is equal to the inner diameter of the inner rib cylinder to be processed, and the outer diameter of the lower end face is smaller than the inner diameter of the cylinder blank;

slip form teeth capable of moving up and down are uniformly distributed on the outer wall of the elastic slip form, a forming groove is formed between every two adjacent slip form teeth, the opening of the forming groove is continuously reduced along with the increase of the outer diameter of the elastic slip form, and the section shape and the size of the forming groove close to the upper end face of the elastic slip form correspond to those of an inner rib cylinder to be processed;

the outer diameter of the cylinder blank is equal to the inner diameter of the outer die cylinder;

when the barrel blank is positioned in the outer die barrel, the bottom plate is positioned at the bottoms of the barrel blank and the outer die barrel and is used for fixing the barrel blank and the outer die barrel.

Furthermore, a sliding mode inner ring for limiting is arranged in the elastic sliding mode.

Furthermore, the inner end surface of the elastic sliding mode is a conical surface.

Furthermore, the cross section of the groove is rectangular, variable cross-section, trapezoidal, T-shaped or L-shaped.

The device further comprises a rotary push rod device, wherein the rotary push rod device consists of a push rod, a push rod seat, a plurality of connecting rods and a plurality of rollers;

the push rod seat is positioned at the tail end of the push rod, the connecting rods are vertically connected to the push rod seat and are uniformly distributed on the periphery of the push rod seat, and the rollers are arranged at the tail end of the connecting rods;

when the push rod rotates, the roller can rotate by taking the connecting rod as an axis.

Furthermore, the push rod seat is fixedly connected with the push rod, and the push rod seat is fixedly connected with the connecting rod;

the idler wheel is hinged on the connecting rod.

A method for processing an inner rib cylinder of a processing device of the inner rib cylinder is characterized by comprising the following steps:

1) placing the cylinder blank in an outer mold cylinder, fixing the cylinder blank and the outer mold cylinder by using a bottom plate, and placing the small end surface of the elastic sliding mold on the cylinder blank in an inward manner;

2) applying external force to push the elastic sliding die to move towards the cylinder blank, extruding the cylinder blank by the sliding die teeth on the periphery of the elastic sliding die, and deforming the cylinder blank until the large end surface of the elastic sliding die moves the other end of the inner rib cylinder;

3) and (5) disassembling to obtain the processed inner rib cylinder.

Further, step 2) utilizes the rotatory pusher to exert external force, specifically is:

placing a rotary push rod device on the elastic slip form, wherein the push rod and the cylindrical blank share the same axis, and the roller is positioned on the upper end surface of the elastic slip form;

pushing the rotary push rod by a preset length, and then rotating for 360 degrees;

in the rotating process, the roller rolls along with the roller to extrude the elastic sliding mold, the ring body of the elastic sliding mold moves downwards integrally, the sliding mold teeth positioned below the roller move downwards synchronously with the ring body, the rest sliding mold teeth do not move downwards synchronously, the part of the barrel blank corresponding to the sliding mold teeth which move downwards synchronously deforms is subjected to local deformation, and meanwhile, the wall thickness is reduced and the inner ribs are filled, so that the deformation is completed;

and generating the inner ribs on the whole circumference of the barrel blank after the 360-degree rotation is finished.

Furthermore, the rotary pusher is propelled in a manner of rotating while being propelled.

Compared with the prior art, the invention has the following beneficial effects:

according to the processing method of the processing device utilizing the inner rib cylinder, the elastic sliding die is rolled on the cylindrical blank, the inner rib can be formed in the cylinder body at one time, in the processing process, the cylindrical blank is locally deformed, deformation is generated along with the contact of the sliding die teeth of the elastic sliding die and the cylindrical blank, and wall thickness reduction and inner rib filling are completed at the same time.

Furthermore, the invention can process the inner ribs with different structures, the cross section of the groove is rectangular, variable cross section, trapezoidal, T-shaped or L-shaped, and the application range is wide.

Furthermore, the external force is applied by the rotary push rod device, the rotary push rod device is used for extruding the elastic sliding die, the elastic sliding die extrudes a blank to generate local large deformation in the contact process of the elastic sliding die and the rotary wheel, the external force required by equipment forming is effectively reduced, the stability in the cylinder forming process is improved, the equipment investment is reduced, and the cost is reduced.

The processing device of the inner rib cylinder has the advantages of few required parts, easiness in processing and controllable cost.

Drawings

FIG. 1 is a schematic diagram of the working principle of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of a rotary pusher of the present invention;

fig. 5 is a schematic structural view of an elastic sliding form of the present invention, wherein fig. 5(a) is a front view and fig. 5(b) is an isometric view;

fig. 6 is a schematic structural view of a cartridge blank of the present invention, wherein fig. 6(a) is an isometric view and fig. 6(b) is a top view;

FIG. 7 is a schematic structural view of a T-shaped thin-walled cylinder with an inner rib processed according to the present invention, wherein FIG. 7(a) is an isometric view and FIG. 7(b) is a top view;

fig. 8 is a sectional view of an inner rib capable of being processed according to the present invention, wherein fig. 8(a) -8(e) are sectional views of a rectangular rib, a truncated rib, a trapezoidal rib, a T-shaped rib, and an L-shaped rib, respectively.

Wherein: 1-bottom plate, 2-outer mould cylinder, 3-elastic sliding mould, 3-1-sliding mould body, 3-2-sliding mould tooth, 3-3-sliding mould inner ring, 4-cylinder blank, 5-inner rib cylinder, 6-rotary push rod device, 6-1-push rod, 6-2-push rod seat, 6-3-connecting rod and 6-4-roller.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, fig. 1 is a schematic diagram of the working principle of the present invention; the cylinder blank 4 is positioned in the outer die cylinder 2, the bottom of the outer die cylinder and the bottom of the outer die cylinder are provided with a bottom plate 1 for fixing, the small end of the elastic slip form 3 is arranged on the cylinder blank 4 inwards, the rotary push rod device 6 is positioned on the elastic slip form 3 and used for pushing the elastic slip form 3 to move inwards, and the elastic slip form 3 can generate local motion to extrude the cylinder blank 4 under the rolling of the rotary push rod device 6. The material of the barrel blank 4 is an easily deformable material such as aluminum alloy, and the material of the outer die barrel 2 is a hardly deformable material such as steel.

Referring to fig. 2, and fig. 2 is a top view of the present invention, after the rotary pusher 6 pushes the elastic sliding form 3 to move, a T-shaped inner rib is formed in the cylinder blank 4.

Referring to fig. 3, fig. 3 is a cross-sectional view of the present invention; the outer diameter of the small end of the elastic sliding die 3 is smaller than the inner diameter of the barrel blank 4.

Referring to fig. 4, fig. 4 is a schematic view of the rotary pusher of the present invention; the rotary push rod device 6 consists of a push rod 6-1, a push rod seat 6-2, 4 connecting rods 6-3 and 4 rollers 6-4. The push rod seat 6-2 is arranged at the front end of the push rod 6-1, the push rod seat and the push rod seat are completely fixed, and 4 connecting rods 6-3 are uniformly distributed on the periphery of the push rod seat 6-2 and are completely fixed with the push rod seat; the rolling surfaces of the rollers 6-4 are cylindrical surfaces or conical surfaces and are respectively arranged at the front ends of the four connecting rods 6-4, and the rollers 6-4 can rotate along the axes of the rollers.

Referring to fig. 5, fig. 5(a) is a top view of an elastic sliding form, and fig. 5(b) is an isometric view of an elastic sliding form; the elastic sliding die 3 comprises a sliding die body 3-1, wherein the sliding die body 3-1 is a base body and is annular, grooves which are uniformly distributed are formed in the upper end surface and the side surface of the sliding die body 3-1, sliding die teeth 3-2 are arranged in the grooves in the upper end surface, the sliding die teeth 3-2 extend into the grooves in the side surface of the sliding die body 3-1 and are attached to the grooves, the cross section of the sliding die teeth 3-2 in the grooves in the side surface of the sliding die body 3-1 is triangular or trapezoidal, and the cross section is continuously reduced from top to bottom; the inner sliding mould ring 3-3 is fixed inside the sliding mould body 3-1, the position of the inner sliding mould ring 3-3 corresponding to the groove on the upper end surface of the sliding mould body 3-1 is also provided with a groove, and the sliding mould teeth 3-2 in the groove on the upper end surface extend into the groove of the inner sliding mould ring 3-3, so that each sliding mould tooth 3-2 is prevented from being separated from the sliding mould body 3-1 when moving upwards. The outer diameter of the large end of the elastic sliding die 3 is equal to the inner diameter of the processed complex inner rib cylindrical piece 5, and the outer diameter of the small end is smaller than the inner diameter of the cylindrical blank 4. A forming groove is formed between the adjacent sliding mode teeth 3-2, and the opening of the forming groove from the small end to the large end of the elastic sliding mode 3 is changed from big to small, so that the materials can conveniently enter and flow out. The opening of the forming groove close to the large end of the elastic sliding mould 3 is small, and the shape and the size of the section of the forming groove are the same as those of the target inner rib, so that the forming groove is a material outflow area.

Referring to fig. 6, fig. 6 is a schematic structural view of a cartridge blank according to the present invention, wherein fig. 6(a) is an isometric view and fig. 6(b) is a top view; the cylinder blank 4 used in the invention is a cylinder with a certain wall thickness.

Referring to fig. 7, fig. 7 is a schematic structural view of a T-shaped inner rib thin-wall cylinder processed according to the present invention, where 7(a) is an isometric view, and 7(b) is a top view, it can be seen that T-shaped inner ribs are uniformly distributed on an inner wall of the cylinder after processing.

Referring to fig. 8, fig. 8 is a cross-sectional view of the inner rib capable of being processed according to the present invention, wherein 8(a) -8(e) are cross-sectional views of a rectangular rib, a truncated rib, a trapezoidal rib, a T-shaped rib, and an L-shaped rib, respectively.

The method for processing the inner rib cylinder by using the processing device of the inner rib cylinder comprises the following steps:

before processing, the cylindrical blank 4 is placed in the outer die cylinder 2, and the cylindrical blank and the outer die cylinder are fixed by using the bottom plate 1;

inserting a small end of the elastic slip form 3 into the cylindrical blank 4, and ensuring that the elastic slip form 3 does not have mounting defects such as deflection and the like;

mounting a rotary push rod device 6 above the elastic sliding form 3, ensuring that a push rod 6-1 and the cylindrical blank 4 are coaxial, slowly feeding the rotary push rod device for a small displacement, and pressing the cylindrical blank 4 of the elastic sliding form 3;

and starting processing, integrally rotating and pushing the rotary push rod device 6, rolling and extruding the elastic sliding die 3 by the roller 6-4, integrally moving down the ring body of the elastic sliding die 3, synchronously moving down the sliding die teeth 3-2 positioned below the roller 6-4 and the ring body, extruding the barrel blank 4 by the sliding die teeth 3-2 under the action of the roller 6-4, so that the barrel blank 4 is subjected to local plastic deformation, wall thickness reduction and inner rib filling are carried out in the barrel blank 4, the residual sliding die teeth 3-2 do not synchronously move down along with the ring body, and the barrel blank 4 at the corresponding position is not deformed.

In one deformed length, the rotary pusher 6 is rotated 360 ° and then deformed for the next length.

And after the machining is finished, stopping the rotary propelling movement of the rotary push rod device 6, and moving in the reverse direction until the rotary push rod device completely leaves the machined complex inner ribbed cylindrical part 5.

The elastic sliding die 3 is taken out by the modes of reversely rotating, pushing and extruding the rotary push rod device 6, ejecting by external force, directly cutting off the end surface of the complex inner rib cylindrical part 5 and the like, and finally the complex inner rib cylindrical part 5 is removed from the outer die cylinder 2 to finish the processing.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims

1. The processing device of the inner rib cylinder is characterized by comprising a bottom plate (1), an outer die cylinder (2), an elastic sliding die (3) and a cylinder blank (4);

the elastic sliding die (3) is annular and continuously shrinks from the upper end face to the lower end face, the outer diameter of the upper end face is equal to the inner diameter of the inner rib cylinder (5) to be processed, and the outer diameter of the lower end face is smaller than the inner diameter of the cylinder blank (4);

sliding die teeth (3-2) capable of moving up and down are uniformly distributed on the outer wall of the elastic sliding die (3), a forming groove is formed between every two adjacent sliding die teeth (3-2), the opening of the forming groove is continuously reduced along with the increase of the outer diameter of the elastic sliding die (3), and the section shape and the size of the forming groove close to the upper end face of the elastic sliding die (3) correspond to those of the inner ribs of the inner rib cylinder (5) to be processed;

the outer diameter of the cylinder blank (4) is equal to the inner diameter of the outer die cylinder (2);

when the barrel blank (4) is positioned in the outer die cylinder (2), the bottom plate (1) is positioned at the bottoms of the barrel blank and the outer die cylinder and is used for fixing the barrel blank and the outer die cylinder.

2. The processing device of the inner rib cylinder according to claim 1, characterized in that an inner slipform ring (3-3) for limiting is arranged in the elastic slipform (3).

3. The apparatus for processing an inner rib cylinder according to claim 1, wherein the inner end surface of the elastic sliding mold (3) is a tapered surface.

4. The apparatus for processing an inner rib cylinder as claimed in claim 1, wherein the cross section of the groove is rectangular, variable cross-section, trapezoidal, T-shaped or L-shaped.

5. The processing device of the inner rib cylinder according to claim 1, further comprising a rotary push rod device (6), wherein the rotary push rod device (6) is composed of a push rod (6-1), a push rod seat (6-2), a plurality of connecting rods (6-3) and a plurality of rollers (6-4);

the push rod seat (6-2) is positioned at the tail end of the push rod (6-1), the connecting rod is vertically connected to the push rod seat (6-2) and uniformly distributed on the periphery of the push rod seat (6-2), and the roller (6-4) is arranged at the tail end of the connecting rod (6-3);

when the push rod (6-1) rotates, the roller (6-4) can rotate by taking the connecting rod (6-3) as an axis.

6. The processing device of the inner rib cylinder as claimed in claim 5, wherein the push rod seat (6-2) is fixedly connected with the push rod (6-1), and the push rod seat (6-2) is fixedly connected with the connecting rod;

the roller (6-4) is hinged on the connecting rod (6-3).

7. A method of processing an inner cylinder using the apparatus for processing an inner cylinder according to any one of claims 1 to 6, comprising the steps of:

1) placing a barrel blank (4) in an outer die barrel (2), fixing the barrel blank and the outer die barrel by using a bottom plate (1), and placing the small end face of an elastic sliding die (3) on the barrel blank (4) inwards;

2) external force is applied to push the elastic sliding die (3) to move towards the cylinder blank (4), the cylinder blank (4) is extruded by the sliding die teeth (3-2) on the periphery of the elastic sliding die (3), and the cylinder blank (4) deforms until the large end surface of the elastic sliding die (3) moves the other end of the inner rib cylinder (5);

3) and (5) disassembling to obtain the processed inner rib cylinder.

8. The method for processing the inner rib cylinder according to claim 7, wherein step 2) applies external force by using the rotary pusher (6), and specifically comprises the following steps:

a rotary push rod device (6) is arranged on the elastic sliding die (3), at the moment, a push rod (6-1) and a cylinder blank (4) are coaxial, and a roller (6-4) is positioned on the upper end surface of the elastic sliding die (3);

pushing the push rod (6-1) to a preset length, and then rotating for 360 degrees;

in the rotating process, the roller (6-4) rolls along with the roller to extrude the elastic sliding die (3), the ring body of the elastic sliding die (3) integrally moves downwards, the sliding die teeth (3-2) positioned below the roller (6-4) synchronously move downwards with the ring body, the rest sliding die teeth (3-2) do not synchronously move downwards, the part of the cylinder blank (4) corresponding to the sliding die teeth (3-2) which synchronously move downwards is locally deformed, and the wall thickness reduction and the inner rib filling are simultaneously carried out to finish the deformation;

and (4) forming an inner rib on the whole circumference of the barrel blank (4) after the 360-degree rotation is finished.

9. The method for processing an inner rib cylinder according to claim 8, wherein the rotary pusher (6) is advanced in a manner of rotating while advancing.