阅读说明：本技术 一种用于航空发动机钛合金精锻叶片化铣的装置 (Device for chemical milling of titanium alloy precision-forged blade of aircraft engine ) 是由 蒋为豪 陆彦良 陈琳 吴永斌 胡吉云 谢凌云 周菊 郭文文 王卓 马哓东 于 2021-11-16 设计创作，主要内容包括：本发明公开了一种用于航空发动机钛合金精锻叶片化铣的装置,该装置主要由机架、电机、齿轮传动机构、滚筒组成,其中滚筒又由支撑筒、固定板、旋转支撑轴、盖板、卡紧螺栓、卡紧板和零件箱侧板等组成,盖板和零件箱侧板形成了零件箱,零件箱上开有通孔,零件箱连接在正多棱柱状支撑筒的侧面,相邻零件箱之间形成化铣液搅拌槽,零件箱中通过纵向隔板和横向隔板划分为多个摆放叶片的单元格,每个单元格中存放一块叶片。本发明可充分搅拌化铣液,化铣液可通过零件箱上分布通孔充分流通于零件箱内外,使化学反应所产生的热量得到快速扩散,叶片表面化铣液成分贫化也能得到及时补充,可减小实际化铣速度与理论速度间的差异,提高化铣精度和质量。(The invention discloses a device for chemically milling titanium alloy precision forged blades of an aircraft engine, which mainly comprises a rack, a motor, a gear transmission mechanism and a roller, wherein the roller comprises a supporting cylinder, a fixing plate, a rotating supporting shaft, a cover plate, a clamping bolt, a clamping plate, a part box side plate and the like, the cover plate and the part box side plate form a part box, the part box is provided with a through hole, the part box is connected to the side surface of the regular polygonal supporting cylinder, a chemical milling liquid stirring groove is formed between adjacent part boxes, the part box is divided into a plurality of unit cells for placing the blades through longitudinal partition plates and transverse partition plates, and one blade is stored in each unit cell. The invention can fully stir the chemical milling liquid, the chemical milling liquid can fully flow inside and outside the part box through the through holes distributed on the part box, so that the heat generated by chemical reaction can be quickly diffused, the depletion of the chemical milling liquid on the surface of the blade can be timely supplemented, the difference between the actual chemical milling speed and the theoretical speed can be reduced, and the chemical milling precision and quality can be improved.)

1. The utility model provides a device that is used for aircraft engine titanium alloy finish forge blade to chemical mill which characterized in that: comprising a drum (4), said drum (4) comprising,

a support cylinder (47), the support cylinder (47) being a regular polygon prism;

the two fixing plates (46) are respectively connected to two end faces of the supporting cylinder (47) in the axial direction;

the rotating support shaft (45), the axis of the rotating support shaft (45) is overlapped with that of the support cylinder (47), and the rotating support shaft (45) is connected with two end faces of the support cylinder (47) in the axis direction and the two fixing plates (46);

the part box is connected to the side face of the supporting cylinder (47), a plurality of cells for storing the titanium alloy precision forging blades are arranged in the part box, the space shapes of the cells enable the titanium alloy precision forging blades to be placed in a vertical state, only 1 titanium alloy precision forging blade is placed in each cell, through holes are formed in the surface of the part box, and the through holes are communicated with spaces in the cells and chemical milling liquid outside the cells;

and a space which does not contain a titanium alloy precision forging blade is formed between two adjacent part boxes of the chemical milling liquid stirring tank and is used for filling and stirring the chemical milling liquid.

2. The device for the titanium alloy precision forging blade milling of the aircraft engine according to claim 1, wherein: the part box comprises a cover plate (41), a clamping bolt (42), a clamping plate (43), a part box side plate (44), a transverse partition plate and a longitudinal partition plate, wherein,

the cover plate (41), the part box side plate (44), the fixing plate (46) and the side surface of the supporting cylinder (47) are combined to form a closed space, and a through groove is formed in the part box side plate (44);

the clamping plate (43) is connected above the cover plate (41) through a clamping bolt (42), and two ends of the clamping plate (43) are respectively arranged in through grooves of side plates (44) of different part boxes;

the longitudinal partition plates and the transverse partition plates are spliced together to divide a closed space formed by combining the side surfaces of the cover plate (41), the part box side plate (44), the fixing plate (46) and the support cylinder (47) into a plurality of cells.

3. The device for the titanium alloy precision forging blade milling of the aircraft engine as claimed in claim 2, wherein: apron (41), part case curb plate (44), fixed plate (46), transverse baffle and longitudinal baffle are the PPR board, and it has the through-hole to open on the PPR board.

4. The device for the titanium alloy precision forging blade milling of the aircraft engine according to claim 3, wherein: the cover plate (41), the part box side plate (44), the transverse partition plate and the longitudinal partition plate are connected in a hot melting welding mode.

5. The device for the titanium alloy precision forging blade milling of the aircraft engine according to claim 1, wherein: the height of the cell is 2-5 mm greater than the total height of the titanium alloy precision forging blade.

6. The device for the titanium alloy precision forging blade milling of the aircraft engine according to claim 1, wherein: at least one of the two fixing plates (46) is provided with teeth on the outer circumferential surface.

7. The device for the titanium alloy precision forging blade milling of the aircraft engine according to claim 1, wherein: also comprises the following steps of (1) preparing,

the rotary drum (4) is connected to the frame (1) through a rotary supporting shaft (45);

the motor (2), the said motor (2) is connected to framework (1);

the input end of the gear transmission mechanism (3) is connected with the motor (2), and the output end of the gear transmission mechanism (3) is connected with the roller (4).

8. The device for the titanium alloy precision forging blade milling of the aircraft engine as claimed in claim 7, wherein: the machine frame (1) comprises a machine frame,

the two bearing plates (12) are arranged at intervals;

and two ends of the supporting beam (11) are respectively connected to the two bearing plates (12).

9. The device for the titanium alloy precision forging blade milling of the aircraft engine as claimed in claim 8, wherein: bearing plate (12) are the PPR board, it is solid metal rod to prop up supporting beam (11), and the surface covering of metal rod has the PPR material layer.

Technical Field

The invention belongs to the technical field of chemical milling of precision-forged blades of aero-engines, and particularly relates to a device for chemical milling of titanium alloy precision-forged blades of aero-engines.

Background

Titanium alloy blade finish forging is a near-net shaping technique, and its blade body and flange medial surface only need through forging and with a small amount of chemical milling again can reach the design size, compares traditional die forging and has improved material utilization greatly, has reduced the machining cost, has improved production efficiency.

At present, the precision forging blades are used in a large amount in aeroengines of developed countries such as Europe and America, and the technical problem still exists when the blade precision forging technology in China starts late. Because the blade body size of the precision forged blade after chemical milling has almost no allowance, the requirement on the chemical milling precision is high, and the blade needs to be prevented from being scratched during the chemical milling process.

However, in the current chemical milling process, the blades are placed in the roller and stacked mutually, and the blades are scraped mutually to generate surface scratches in the chemical milling process. In addition, because the blades are stacked mutually and the chemical milling liquid is not fully stirred, heat generated by chemical reaction cannot be diffused quickly, and the dilution of the components of the chemical milling liquid on the surfaces of the blades caused by the reaction cannot be supplemented in time, so that the chemical milling speed is greatly different from the theoretical speed, and the chemical milling precision is insufficient.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a device for chemically milling titanium alloy precision-forged blades of an aircraft engine, which can avoid the blades from being scratched and bumped in the chemical milling process and improve the uniformity of the concentration and temperature of chemical milling liquid in the whole chemical milling groove, thereby ensuring the surface quality of the blades and improving the chemical milling precision of the blades.

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

a device for milling a titanium alloy precision forging blade of an aircraft engine comprises a roller, wherein the roller comprises a roller body,

the supporting cylinder is a regular polygon prism;

the two fixing plates are respectively connected to two end faces in the axial direction of the supporting cylinder;

the rotary supporting shaft is superposed with the axis of the supporting cylinder and is connected with two end faces in the axial direction of the supporting cylinder and the two fixing plates;

the part box is connected to the side face of the supporting cylinder, a plurality of cells for storing the titanium alloy precision forging blades are arranged in the part box, the titanium alloy precision forging blades are placed in a vertical state due to the spatial shapes of the cells, only 1 titanium alloy precision forging blade is placed in each cell, through holes are formed in the surface of the part box, and the through holes are communicated with spaces in the cells and chemical milling liquid outside the cells;

and a space which does not contain a titanium alloy precision forging blade is formed between two adjacent part boxes of the chemical milling liquid stirring tank and is used for filling and stirring the chemical milling liquid.

Alternatively, the parts box comprises a cover plate, a clamping bolt, a clamping plate, side plates of the parts box, a transverse partition plate and a longitudinal partition plate, wherein,

the cover plate, the side plate of the part box, the fixed plate and the side surface of the supporting cylinder are combined to form a closed space, and a through groove is formed in the side plate of the part box;

the clamping plate is connected above the cover plate through a clamping bolt, and two ends of the clamping plate are respectively arranged in the through grooves of the side plates of different part boxes;

the longitudinal partition plates and the transverse partition plates are spliced together to divide a closed space formed by combining the side surfaces of the cover plate, the side plates of the part box, the fixing plate and the supporting cylinder into a plurality of cells.

As an option, apron, part case curb plate, fixed plate, horizontal baffle and longitudinal baffle are the PPR board, and open on the PPR board has the through-hole.

Alternatively, the cover plate, the side plate of the part box, the transverse partition plate and the longitudinal partition plate are connected by a hot-melt welding method.

Alternatively, the height of the unit cell is 2 mm-5 mm greater than the total height of the titanium alloy precision forging blade.

Alternatively, at least one of the two fixing plates has teeth on its outer circumferential surface.

Alternatively, the device for milling the titanium alloy precision forged blade of the aircraft engine further comprises,

the roller is connected to the rack through a rotary supporting shaft;

the motor is connected to the rack;

and the input end of the gear transmission mechanism is connected with the motor, and the output end of the gear transmission mechanism is connected with the roller.

As an alternative, the frame comprises,

the two bearing plates are arranged at intervals;

and two ends of the supporting beams are respectively connected to the two bearing plates.

Alternatively, the surfaces of the bearing plate and the supporting beam are covered with a PPR material layer.

As another alternative, the bearing plate is a PPR plate (a whole PPR plate), the supporting beam is a solid metal rod, and the surface of the metal rod is covered with a PPR material layer.

Compared with the prior art, the invention provides a device capable of improving the chemical milling precision and the surface quality of a precision-forged blade, and the device has the following characteristics:

(1) each cell in the part box is provided with at most one blade, and the hardness of the PPR plate forming the part box is far lower than that of the titanium alloy, so that the blades can be prevented from being scratched, and the surface quality of the blades can be ensured.

(2) In the rotating process of the roller, the chemical milling liquid stirring tank formed between the part boxes on the circumference of the roller can fully stir the chemical milling liquid, the chemical milling liquid can fully circulate inside and outside the part boxes through the small circular through holes distributed on the part boxes, so that heat generated by chemical reaction can be quickly diffused, dilution of chemical milling liquid components on the surface of the blade caused by the reaction can be timely supplemented, the difference between the actual chemical milling speed and the theoretical speed can be reduced, and the chemical milling precision is improved.

(3) In addition, the unique placing mode of the blades in the part box can reduce the chemical milling speed difference of the blade basin back, so that the chemical milling precision is further improved.

Drawings

FIG. 1 is a schematic view of the overall appearance of a chemical milling apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of a housing of a chemical milling apparatus in an embodiment of the method of the present invention;

FIG. 3 is a schematic view of the external shape of a drum portion of a chemical milling apparatus according to an embodiment of the method of the present invention;

FIG. 4 is a schematic cross-sectional view of a drum with a bin filled with blades according to an embodiment of the method of the invention;

FIG. 5 is a schematic view of a single parts box after circular through holes have been made;

FIG. 6 is a partial schematic view of the parts box with the blade installed;

in the figure, 1, a frame, 2, a motor, 3, a gear transmission mechanism, 4, a roller, 41, a cover plate, 42, a clamping bolt, 43, a clamping plate, 44, a side plate of a part box, 45, a rotary supporting shaft, 46, a fixing plate, 47, a supporting cylinder, 11, a supporting beam and 12, a force bearing plate.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.

The device for chemically milling the titanium alloy precision-forged blade of the aircraft engine mainly comprises a rack 1, a motor 2, a gear transmission mechanism 3 and a roller 4. The whole chemical milling device mainly comprises random copolymerization polypropylene (PPR) plates with different thicknesses, and the PPR plates are connected in a hot melting welding mode. The PPR has the characteristics of light weight, high strength, corrosion resistance and the like, and the hardness of the PPR is far lower than that of the titanium alloy, so that the surface of the blade cannot be scratched.

Wherein, the frame 1 plays a role of bearing and fixing other parts, and the motor 2 drives the roller 4 to rotate through the gear transmission mechanism 3; the drum 4 is composed of a support cylinder 47 having a regular hexagonal prism shape in cross section and six identical parts boxes on the circumferential surface thereof.

Two ends of the supporting cylinder 47 are fixed by two circular fixing plates 46, wherein the circular fixing plate 46 at one end is processed into a large gear, and a middle gear of the gear transmission mechanism 3 is fixed on the frame 1 and meshed with the large gear and a small gear on the motor 2 to jointly form the gear transmission mechanism 3. The part case on cylinder 4 mainly comprises apron 41, chucking bolt 42, chucking board 43 and part case curb plate 44, separates for a plurality of cell through horizontal baffle and longitudinal baffle in the incasement, and the cell height is slightly higher (generally 2mm ~ 5mm) than the total height of blade, and the cell is slightly big than the blade appearance, guarantees that cylinder rotation in-process blade has comparatively stable relative position in the part case. All the PPR board surfaces forming the part box are uniformly distributed with round small through holes (generally not less than) And in the rotating process of the roller 4, chemical milling liquid inside and outside the part box can be fully exchanged through the small through holes. Four symmetrical strip-shaped through holes are formed in the upper parts of the two part box side plates 44, and the clamping plates 43 can be screwed into the strip-shaped through holes around the clamping bolts 42, so that the cover plate 41 is pressed tightly, and the blades are sealed in the cells. Six blade part boxes are distributed in the circumferential direction of the supporting cylinder 47 at equal angular intervals, a single part box is distributed along the axial direction of the roller 4 and is in a cube shape, a V-shaped groove is formed between two adjacent part boxes, 6V-shaped grooves are totally uniformly distributed on the circumferential surface of the roller 4, and when the roller 4 rotates, the 6V-shaped groovesThe side surface can well stir the chemical milling liquid.

The chemical milling device of the present invention is described in detail below with reference to fig. 1 to 6:

as shown in fig. 1, the blading chemical milling device in this embodiment is composed of a frame 1, a motor 2, a gear transmission mechanism 3 and a roller 4. The whole device mainly comprises random copolymerization polypropylene (PPR) plates with different thicknesses, and the PPR plates are connected in a hot melting welding mode. Wherein the frame 1 plays the effect of bearing and fixed other part, and the motor 2 drives the cylinder 4 through gear 3 and rotates.

The frame 1 is partially shown in fig. 2, and the structure of the frame is mainly composed of 9 support beams 11 and two bearing plates 12. For the bearing capacity that improves a supporting beam 11, 11 insides of a supporting beam can be steel tube construction, and the skin is wrapped up by the PPR material, and two load bearing plates 12 are the PPR material, and the face relevant position is opened has circular through-hole to installation gear and cylinder 4.

The drum 4 has an external shape as shown in fig. 3, and has a supporting cylinder 47 having a regular hexagonal cross section inside, and six identical component boxes are mounted on six circumferential surfaces of the supporting cylinder 47. The parts box is mainly composed of a cover plate 41, a clamping bolt 42, a clamping plate 43 and parts box side plates 44. The two circular fixing plates 46 are fixed at two ends of the supporting cylinder 47, the supporting cylinder 47 and the part box structure can be reinforced, the circular fixing plate 46 at one end is processed into a large gear, and the motor can drive the roller to rotate along the rotating supporting shaft 45 through the gear transmission mechanism when rotating.

In fig. 4, a schematic cross-sectional view of a drum 4 is shown with six parts boxes filled with blades in the circumferential direction, which are shaped like a turbine. The curb plate of two adjacent part casees forms a V-arrangement groove, totally 6V-arrangement grooves, and the chemical milling in-process, 4 rotations of cylinder drive V-arrangement groove intensive mixing tank liquor. The height of the unit lattice in the part box is slightly higher than the total height of the blades (generally 2 mm-5 mm), and the unit lattice is slightly larger than the appearance of the blades, so that the blades have stable relative positions in the part box in the rotating process of the roller 4.

The appearance of the single part case is shown in fig. 5, and all the PPR board surfaces forming the part case are uniformly distributed with round small through holes (generally not less than) The chemical milling liquid can be smoothly flowed in and out of the part box. Four symmetrical strip-shaped through holes are formed in the upper portions of the two part box side plates 44, and the clamping plates 43 can be screwed into the strip-shaped through holes around the clamping bolts 42 so as to tightly press the cover plate 41.

FIG. 6 is a partial schematic view of the parts box after installation of the blade, such placement allowing better flow of the chemical milling fluid through the blade basin back.

The process of chemically milling the blade by adopting the chemical milling device comprises the following steps:

as shown in fig. 3 and 4, the cover plate 41 can be removed by first sequentially loosening the fastening bolts 42 and then screwing the fastening plate 43 off the strip-shaped through hole. The blades are placed in the cells in the parts box, one blade at most is placed in each cell in the manner shown in fig. 4 and 6, and the cover plate 41 is locked to seal the parts box in the reverse process. The chemical milling line equipment is started to move the chemical milling device to the position above the chemical milling groove and then descend into the chemical milling groove, so that the chemical milling liquid completely submerges the roller 4, and the motor 2 is started to enable the roller 4 to rotate. And (4) moving the roller 4 upwards to leave the chemical milling groove until the chemical milling time is finished, and taking out the blade after cleaning in a hot water groove to finish the chemical milling process.

The device for chemically milling the titanium alloy precision-forged blade of the aircraft engine improves the uniformity of the concentration and the temperature of the chemical milling liquid in the whole chemical milling groove, and mainly has the following reasons:

firstly, 6V-shaped grooves are formed in the circumference of the roller 4, the roller 4 can continuously rotate in the chemical milling process to stir the chemical milling liquid, so that the diffusion and homogenization of solutes in the chemical milling liquid are accelerated, the diffusion of heat generated by chemical reaction on the surface of a blade to the periphery is also accelerated, and the homogenization of the temperature of the bath liquid is promoted;

secondly, the blades are evenly distributed on the circumferential direction of the roller 4, a large number of through holes are distributed on each cell partition plate, when the roller 4 rotates, the blades can be driven to do circular motion, and in the motion process, the chemical milling liquid reversely scours the blade bodies of the blades, so that the diffusion of solute and heat is accelerated, and the homogenization of the solute and the heat is promoted.

Thirdly, in the conventional chemical milling method, all the blades are stacked in the roller, the inside of the roller is of a large single-cavity structure, and even if the roller rotates, all the blades are stacked and extruded at the bottom of the roller under the action of gravity, so that the supply of solute and the diffusion of heat are insufficient. The invention uses the part box to separate the blades, thus solving the problem of blade accumulation.

As shown in fig. 4 and 6, the blades of the present invention are placed in the component box in a unique manner, that is, the blades are vertically placed in the cells, and the front edge and the rear edge of each blade are located on the cross section of the same roller 4 as much as possible, so that when the roller 4 rotates, the included angle between the back surface of the basin of each blade and the movement direction of the basin is small, the speed of the chemical milling liquid flowing through the basin and the back of each blade is similar, and the chemical milling speed of the basin and the back of each blade is similar. When the roller rotates, the speed difference of the bath solution for washing the basin back of the blade is small in the blade placing mode, so that the chemical milling speed difference of the basin back is reduced as much as possible. The principle is similar to that when an airplane flies in the air, the upper surface and the lower surface of the wing are parallel to the flying direction as much as possible, so that the difference of the speeds of the upper surface and the lower surface of the airflow scouring is minimum, if the included angle between the upper surface and the flying direction of the upper surface and the lower surface is increased, the speed of the airflow scouring one surface is increased, and the scouring speed of the other surface is reduced, so that the difference is increased.