阅读说明：本技术 带内壁纵向筋筒形件成品及其成形方法 (Finished product of cylindrical part with inner wall longitudinal ribs and forming method thereof ) 是由 于忠奇 赵亦希 甘甜 杜陈阳 李昕 于 2019-09-17 设计创作，主要内容包括：本发明提供了一种带内壁纵向筋的筒形件的成形方法,包括以下步骤：S1、成筋工艺参数设计；S2、旋压工艺轨迹规划：包括旋轮初始位置、筒形坯料加热温度、成筋工艺参数设计和表面整形工艺；S3、将筒形坯料进行预热；S4、将加热的筒形坯料套在旋压芯模上,并用尾顶固定筒形坯料尾部,同时初始化旋轮位置；S5、开启旋压机主轴并带动旋压芯模和筒形坯料转动,然后点燃火焰加热枪均匀加热筒形坯料；S6、启动旋压机操作系统,按照预设的旋压工艺轨迹进行加工,旋压完毕后,卸下带内壁纵向筋的筒形件成品。本发明结合了正旋、反旋、主轴反转旋压工艺优点,不但内筋高度得到了提升,而且内筋轴向和周向的均匀性提升明显。(The invention provides a method for forming a cylindrical part with inner wall longitudinal ribs, which comprises the following steps: s1, designing parameters of the rib forming process; s2, planning the spinning process track: the method comprises the steps of setting the initial position of a rotary wheel, heating the cylindrical blank, designing parameters of a rib forming process and shaping the surface of the rib forming process; s3, preheating the cylindrical blank; s4, sleeving the heated cylindrical blank on a spinning core mold, fixing the tail of the cylindrical blank by using the tail top, and initializing the position of a spinning wheel; s5, starting a spindle of the spinning machine, driving the spinning core mold and the cylindrical blank to rotate, and then igniting a flame heating gun to uniformly heat the cylindrical blank; and S6, starting an operating system of the spinning machine, processing according to a preset spinning process track, and unloading the finished cylindrical part with the longitudinal ribs on the inner wall after spinning. The invention combines the advantages of forward spinning, backward spinning and main shaft reverse spinning processes, not only the height of the inner rib is improved, but also the uniformity of the inner rib in the axial direction and the circumferential direction is obviously improved.)

1. A method of forming a tubular member having longitudinal ribs on an inner wall, comprising the steps of:

step S1, design of parameters of rib forming process

According to the geometric dimensions of the finished cylindrical part with the inner wall longitudinal ribs and the cylindrical blank with the inner smooth wall and the outer smooth wall, the following five key process parameters are respectively designed: the method comprises the following steps of (1) rolling a wheel to form ribs, pressing down quantity M, the number N of spinning forming passes, the feeding direction of the rolling wheel, the rotating speed of a main shaft and the feeding rate f;

step S2, planning the path of the spinning process

The method comprises the steps of setting the initial position of a spinning wheel, heating the cylindrical blank, designing parameters of a ribbing process and performing a surface shaping process, and inputting the parameters into an operating system of a spinning machine to generate a spinning process track;

step S3, preheating the cylindrical blanks of the inner and outer smooth walls in a heating furnace;

step S4, sleeving the heated cylindrical blank with the inner and outer smooth walls on a spinning core mold with a plurality of longitudinal rib grooves, fixing the tail of the cylindrical blank by using the tail top, and initializing the position of a spinning wheel;

step S5, starting a spindle of the spinning machine, driving the spinning core mold and the cylindrical blank to rotate, then igniting a flame heating gun to uniformly heat the cylindrical blank, and keeping the temperature of the cylindrical blank;

and S6, starting an operating system of the spinning machine, processing according to the spinning process track preset in the step S2, and unloading the finished cylindrical part with the longitudinal ribs on the inner wall after spinning.

2. The method of forming a tubular member with an inner wall longitudinal rib according to claim 1, wherein in said step S1,

the pressing quantity M of the formed ribs of the rotary wheel is smaller than the height of the longitudinal ribs of the finished cylindrical part with the longitudinal ribs on the inner wall;

the number N of the spinning forming passes is not less than 3 and is an odd number of passes, and each pass is divided into a rib pressing amount M;

forward spinning is adopted when the number of times of the spinning wheel is odd, namely the spinning wheel moves from the tail part of the cylindrical blank to the port of the cylindrical blank; adopting return spinning when the times are even, namely, a spinning wheel runs from the port of the cylindrical blank to the tail part of the cylindrical blank;

the rotating speed of the main shaft is 50-100RPM, and the rotating direction of the main shaft is kept unchanged in the spinning process;

the feeding rate f is 0.5-2mm/r when the times of the tracks are odd; the feed rate used when the number of passes is even is greater than the feed rate used when the number of passes is odd.

3. The method for forming a finished longitudinal ribbed cylindrical member with an inner wall as claimed in claim 2, wherein said spinning wheel has a rib depression M of 80% to 90% of the height of the longitudinal rib of the inner wall.

4. The method for forming the finished longitudinal ribbed cylindrical member with inner wall as claimed in claim 2, wherein in step S1, the number N of spinning passes is positive integer, N is greater than or equal to 3 and less than or equal to 7, and is odd.

5. The method for forming a finished longitudinal ribbed cylindrical member with an inner wall as claimed in claim 2, wherein in the rib forming process parameters of step S1, the even-number-pass feeding rate is 3-7 times of the odd-number-pass feeding rate.

6. The method of forming a tubular member with an inner wall longitudinal rib according to claim 1, wherein in said step S2,

moving the rotary wheel to the tail part of the cylindrical blank of the inner smooth wall and the outer smooth wall at the initial position of the rotary wheel, wherein the rotary wheel is tangent to the outer surface of the cylindrical blank;

the blank heating temperature is used for heating the cylindrical blanks of the inner and outer smooth walls to meet the requirement of forming plasticity;

and designing parameters of the ribbing process according to the step S1.

7. The method for forming a finished longitudinal ribbed cylindrical member with an inner wall as claimed in claim 6, wherein the forming plasticity requirement is based on no cracking phenomenon.

8. The method for forming a finished longitudinal ribbed cylindrical member with an inner wall according to claim 1, wherein in the surface shaping process, based on the rib forming process parameters of step S1, a feeding rate of 0.5-2mm/r is used, and forward spinning is performed to meet the surface roughness requirement.

9. The method of forming a finished longitudinal ribbed tubular member with an inner wall as set forth in claim 1, wherein said step S3 is performed by applying solid lubrication to a spinning core die with a plurality of longitudinal ribs installed on a main shaft, and only the rib groove portion of the male die is coated.

10. A tubular member with inner wall longitudinal ribs, characterized in that it is manufactured by the method for forming a finished tubular member with inner wall longitudinal ribs according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of sheet plastic processing, in particular to a finished product of a longitudinal rib cylindrical part with an inner wall and a forming method thereof.

Background

The integral processing of the cylindrical part with the longitudinal inner rib mainly adopts methods of flow spinning, casting, forging-machining and the like at present. Besides the plastic processing method, other methods have certain limitations in the aspect of processing the cylindrical part with the longitudinal inner rib, such as poor casting mechanical property and large thickness of the cylindrical wall of a part; long forging-mechanical processing milling processing time, low material utilization rate and the like. The spinning process has the advantages of small relative load, high forming precision, good mechanical property and the like, and provides a good way for integrally forming and manufacturing the cylindrical part with the longitudinal inner rib.

In the aspect of manufacturing the cylindrical part with the longitudinal inner rib by adopting the spinning process, the cylindrical part with the longitudinal inner rib can be obtained by using the room-temperature flow spinning process for the cylindrical part with the longitudinal inner rib made of a good plastic material, and the current mature technology is used for the flow spinning manufacturing of hollow gear parts. The hollow gear part is characterized in that: the teeth are dense, the tooth height and the tooth width are small, and the teeth are trapezoidal. In aerospace product construction, there is another type of tubular member with a longitudinal inner web, such as a fuel tank. The longitudinal inner rib cylindrical part of the spaceflight band is characterized in that: the height-width ratio of the inner rib is larger, and the section of the inner rib is approximately rectangular. Compared with hollow gear parts, the longitudinal inner rib cylindrical part of the spaceflight belt needs larger rib filling amount, the existing room temperature flow spinning process is difficult to manufacture a component with full inner ribs, and for example, the room temperature flow spinning can cause cracking phenomenon when the pressing amount is large.

For the longitudinal inner rib cylindrical part of the spaceflight belt, the uniformity of the inner rib is required to be good, and the section of the inner rib is approximate to a rectangle due to the large height-width ratio of the inner rib, so that the traditional method is not suitable.

Through the search of the prior art, the invention patent with application number 201410753785.X discloses a method for extruding an inner transverse rib of a cylindrical part, which comprises the following specific steps: (1) the left male die and the right male die downwards extrude the blank; (2) the left male die and the right male die move left and right respectively, and the head working belts of the left male die and the right male die are pressed into the cylinder wall; (3) rotating the female die, and continuously moving the left male die and the right male die left and right; (4) stopping the horizontal separation movement of the left male die and the right male die, extruding the blank again by the left male die and the right male die, and continuously rotating the female die to form a cylinder wall of an oblique fiber tissue; (5) stopping the female die from rotating, and combining the left male die and the right male die; (6) after combination, the whole body goes down and a blank is extruded; (7) the left male die and the right male die are separated, and the female die rotates; (8) after extrusion and rotation are finished, the left male die and the right male die are folded; (9) the left male die and the right male die go upwards, and the ejector rod ejects the extrusion part out of the female die to complete the whole extrusion and rotation process. The method is an extrusion method for the transverse ribs in the cylindrical part, and cannot meet the requirement that the height-width ratio of the inner ribs in the cylindrical part with the longitudinal inner ribs of the spaceflight band is large.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a finished product of a longitudinal rib cylindrical part with an inner wall and a forming method thereof.

The invention provides a method for forming a cylindrical part with inner wall longitudinal ribs, which comprises the following steps:

step S1, design of parameters of rib forming process

According to the geometric dimensions of the finished cylindrical part with the inner wall longitudinal ribs and the cylindrical blank with the inner smooth wall and the outer smooth wall, the following five key process parameters are respectively designed: the method comprises the following steps of (1) rolling a wheel to form ribs, pressing down quantity M, the number N of spinning forming passes, the feeding direction of the rolling wheel, the rotating speed of a main shaft and the feeding rate f;

and step S2, planning the path of the spinning process, including a ribbing stage process and a surface shaping process.

The method specifically comprises the steps of setting the initial position of a spinning wheel, heating the cylindrical blank, designing parameters of a ribbing process and performing a surface shaping process, and inputting the parameters into an operating system of a spinning machine to generate a spinning process track;

step S3, preheating the cylindrical blanks of the inner and outer smooth walls in a heating furnace;

step S4, sleeving the heated cylindrical blank with the inner and outer smooth walls on a spinning core mold with a plurality of longitudinal rib grooves, fixing the tail of the cylindrical blank by using the tail top, and initializing the position of a spinning wheel;

step S5, starting a spindle of the spinning machine, driving the spinning core mold and the cylindrical blank to rotate, then igniting a flame heating gun to uniformly heat the cylindrical blank, and keeping the temperature of the cylindrical blank;

and S6, starting an operating system of the spinning machine, processing according to the spinning process track preset in the step S2, and unloading the finished cylindrical part with the longitudinal ribs on the inner wall after spinning.

Further, in step S1, the spinning wheel rib pressing amount M: the longitudinal rib height of the finished product of the cylindrical part with the inner wall longitudinal rib is smaller than that of the finished product of the cylindrical part with the inner wall longitudinal rib; number of spinning forming passes N: not less than 3 passes and odd passes, and each pass is divided into a rib pressing amount M; the feeding direction of the spinning wheel is as follows: when the times are odd, forward spinning is adopted, namely a spinning wheel moves from the tail part of the cylindrical blank to the port of the cylindrical blank; adopting return spinning when the times are even, namely, a spinning wheel runs from the port of the cylindrical blank to the tail part of the cylindrical blank; main shaft rotating speed: at 50-100RPM, the rotation direction of the main shaft is kept unchanged in the spinning process; feed rate f: the feeding rate adopted when the times are odd is 0.5-2 mm/r; the feed rate used when the number of passes is even is greater than the feed rate used when the number of passes is odd.

Furthermore, the pressing amount M of the formed ribs of the rotary wheel is 80% -90% of the height of the longitudinal ribs of the inner wall.

Further, in step S1, the number N of spin forming passes is a positive integer, N is greater than or equal to 3 and less than or equal to 7, and is an odd number.

Furthermore, in the ribbing process parameters of step S1, the even-pass feed rate is 3-7 times of the odd-pass feed rate.

Further, in step S2, the initial position of the spinning wheel is: moving the rotary wheel to the tail part of the cylindrical blank of the inner smooth wall and the outer smooth wall, and enabling the rotary wheel to be tangent to the outer surface of the cylindrical blank; the blank heating temperature is used for heating the cylindrical blanks of the inner and outer smooth walls to meet the requirement of forming plasticity; and designing parameters of the ribbing process according to the step S1.

Further, in the step S2, the requirement of forming plasticity is based on the absence of cracking.

Further, in the surface shaping process, based on the ribbing process parameters of the step S1, the feeding rate is 0.5-2mm/r, and forward spinning is adopted to meet the requirement of surface roughness.

Further, in step S3, the spinning core die with the plurality of longitudinal grooves attached to the main shaft is subjected to solid lubrication, and only the groove portion of the male die is coated.

The invention also provides a cylindrical part with the inner wall longitudinal ribs, which is manufactured by adopting the forming method of the finished product of the cylindrical part with the inner wall longitudinal ribs.

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

1. compared with the spinning process without adopting the return spinning, the forming method of the cylindrical part with the inner wall longitudinal ribs, which is disclosed by the invention, combines the return spinning idea and the multi-pass spinning process, and effectively improves the height of the inner ribs of the finished cylindrical part with the inner wall longitudinal ribs.

2. The method for forming the cylindrical part with the inner wall longitudinal ribs can obviously increase the thickness of the cylindrical blank after the back-spinning, can increase the holding force between the cylindrical wall and the core mold, and increases the resistance of the axial flow of the material, so that the material can flow along the circumferential direction more easily in the forward spinning pass after the back-spinning, and the material can flow to the longitudinal ribs and grooves.

3. The forming method of the cylindrical part with the inner wall longitudinal ribs combines the advantages of forward spinning, backward spinning and main shaft reverse spinning processes, not only the height of the inner ribs is improved, but also the uniformity of the inner ribs in the axial direction and the axial direction is obviously improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of the construction of a cylindrical blank for the inner and outer light walls of the present invention;

FIG. 2 is a schematic structural view of a finished cylindrical member with inner wall longitudinal ribs according to the present invention;

FIG. 3 is a schematic diagram of a spinning track at a rib forming stage according to the present invention;

FIG. 4 is a schematic structural view of a spinning mandrel of the present invention;

FIG. 5 is a state diagram of a spinning process of a finished cylindrical member with inner wall longitudinal ribs according to the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

The invention provides a forming method of a cylindrical part with a longitudinal inner rib, which comprises the following steps: step S1: designing technological parameters of a rib forming stage; step S2: planning a spinning process track, which comprises a rib forming stage process and a surface shaping process; step S3: preheating the cylindrical blank, and lubricating a longitudinal rib groove on the spinning core mold; step S4: fixing the heated cylindrical blank to a spinning core mold; step S5: and (4) heating and spinning for multiple times to form the cylindrical part with the longitudinal inner rib meeting the requirements. The invention combines the advantages of forward spinning, backward spinning and main shaft reverse spinning processes, not only the height of the inner rib is improved, but also the uniformity of the inner rib in the axial direction and the circumferential direction is obviously improved.