阅读说明：本技术 一种加工空心电机轴的旋锻锤头 (Rotary swaging hammer head for processing hollow motor shaft ) 是由 汪朝晖 徐文侠 程自强 高全杰 武囡囡 于 2019-11-12 设计创作，主要内容包括：本发明提出了一种加工空心电机轴的旋锻锤头,包括锤头本体,锤头本体上具有安装部和与安装部连为一体的锻造部,锻造部顶部沿锤头本体长度方向设置有多个用于锻压成型空心电机轴外轮廓的锻压面,多个锻压面沿锤头本体长度方向呈阶梯状排布,相邻锻压面之间以弧面过渡,其中各锻压面上均设置有相互连接的第一圆弧面和第二圆弧面,第二圆弧面的直径与毛坯锻件直径相等,第一圆弧面的直径与空心电机轴相应段直径相等。本发明所公开的用于加工空心电机轴的旋锻锤头可以使外部形状复杂的空心电机轴通过一道工序即可旋锻成形,还适用于各种大小变径空心轴的旋锻。在锻压成型过程中,遵循“点-线-面”准则,提高锻件表面的精度。(The invention provides a rotary forging hammer head for processing a hollow motor shaft, which comprises a hammer head body, wherein the hammer head body is provided with an installation part and a forging part which is connected with the installation part into a whole, the top of the forging part is provided with a plurality of forging surfaces for forging and forming the outer contour of the hollow motor shaft along the length direction of the hammer head body, the forging surfaces are distributed in a step shape along the length direction of the hammer head body, adjacent forging surfaces are in arc surface transition, each forging surface is provided with a first arc surface and a second arc surface which are connected with each other, the diameter of the second arc surface is equal to that of a blank forging piece, and the diameter of the first arc surface is equal to that of the corresponding section of the hollow motor shaft. The rotary swaging hammer head for processing the hollow motor shaft disclosed by the invention can be used for carrying out rotary swaging on the hollow motor shaft with a complex external shape through one process, and is also suitable for rotary swaging of variable-diameter hollow shafts with various sizes. In the forging and pressing forming process, the surface precision of the forged piece is improved according to the 'point-line-surface' rule.)

1. The utility model provides a rotary swaging hammer head of processing hollow motor shaft, includes hammer head body (1), its characterized in that: the forging head is characterized in that the hammer head body (1) is provided with an installation part (2) and a forging part (3) which is connected with the installation part (2) into a whole, the top of the forging part (3) is provided with a plurality of forging surfaces (4) for forging and forming the outer contour of the hollow motor shaft along the length direction of the hammer head body, the forging surfaces (4) are arranged in a step shape along the length direction of the hammer head body, adjacent forging surfaces (4) are in transition through an arc surface, and each forging surface (4) is provided with a first arc surface (41) and a second arc surface (42) which are connected with each other.

2. The swaging hammer head for processing a hollow motor shaft according to claim 1, wherein: the first arc surface (41) is located at the center of the forging surface, the second arc surfaces (42) are arranged in two numbers and located on two sides of the first arc surface (41) respectively, and the axial leads of the second arc surfaces (42) are coaxial.

3. The swage head for machining hollow motor shafts according to claim 2, wherein: the diameter of the second arc surface (42) is equal to that of the blank forging, and the diameter of the first arc surface (41) is equal to that of the corresponding section of the hollow motor shaft.

4. The swaging hammer head for processing a hollow motor shaft according to claim 1, wherein: the axial length of each forging surface (4) is equal to the length of the corresponding section of the hollow motor shaft.

5. The swaging hammer head for processing a hollow motor shaft according to claim 1, wherein: installation department (2) include two flank (21) that set up respectively in tup body both sides, flank (21) are used for fixing tup body (1) on the rotary swaging machine.

6. The swaging hammer head for machining the hollow motor shaft according to claim 1, wherein an included angle α between two radial side planes of the hammer head body (1) is 90 °.

7. The swaging hammer head for processing a hollow motor shaft according to claim 1, wherein: the hammer head body (1) is approximately a cuboid, and the hammer head body (1) is made of hard alloy steel.

Technical Field

The invention relates to the technical field of radial forging dies, in particular to a rotary forging hammer for machining a hollow motor shaft.

Background

The hollow motor shaft is an important component of a motor in a new energy automobile transmission system, belongs to a precision part, and has a complex internal structure and high requirement on external quality precision. The rotor in the motor is driven to move, so that the functions of transmitting torque and bearing load are achieved, and mutual conversion between electric energy and mechanical energy is achieved; and the output shaft of the speed reducer and the differential are connected to control the running of the automobile, and the control device is a key part for determining the driving performance and the running stability of the automobile.

The common processing method for shaft forming mainly comprises the following steps: the die forging extrusion method, the rotary swaging method and the machining method have advantages and disadvantages, but the radial rotary swaging method has the advantage of being unique in the aspect of processing the motor shaft with the same wall thickness compared with the die forging extrusion method. However, the rotary swaging die for the hollow mandrel in the prior art usually has only a working surface with a single shape, and for some hollow shafts with complex external shapes, multiple processes are needed to carry out rotary swaging, so that the production efficiency is low and the cost is high.

Although the design method of the rotary swaging die for the hollow shaft (ZL 2014101273913) discloses that the rotary swaging die for working faces with different shapes is designed according to the complex external shape of the hollow shaft, the problems of high production efficiency and low production cost of the complex hollow shaft are solved. However, the design principle of the arc surface of the rotary swaging hammer head is that the size of the arc surface is larger than the diameter of the blank, which is not suitable for a stepped shaft with larger step diameter difference. Therefore, it is essential to develop a hammer head suitable for a stepped shaft having a large difference in step diameter and capable of swaging through one process.

Disclosure of Invention

In view of the above, the present invention provides a swaging hammer head suitable for one-step forming outside of various hollow motor shafts, so as to overcome the above-mentioned drawbacks of the prior art.

The technical scheme of the invention is realized as follows: the invention provides a rotary forging hammer head for processing a hollow motor shaft, which comprises a hammer head body, wherein the hammer head body is provided with an installation part and a forging part which is connected with the installation part into a whole, the top of the forging part is provided with a plurality of forging surfaces for forging and forming the outer contour of the hollow motor shaft along the length direction of the hammer head body, the forging surfaces are arranged in a step shape along the length direction of the hammer head body, adjacent forging surfaces are in arc surface transition, and each forging surface is provided with a first arc surface and a second arc surface which are connected with each other.

Furthermore, the first arc surface is located at the center of the forging surface, the number of the second arc surfaces is two, the second arc surfaces are located on two sides of the first arc surface respectively, and the axial leads of the second arc surfaces are coaxial.

Furthermore, the diameter of the second arc surface is equal to that of the blank forging, and the diameter of the first arc surface is equal to that of the corresponding section of the hollow motor shaft.

Further, the axial length of each forging surface is equal to the length of the corresponding section of the hollow motor shaft.

Further, the installation department includes that two set up the flank in tup body both sides respectively, the flank is used for fixing the tup body on the rotary swaging machine.

Preferably, the included angle α between the two radial side planes of the hammer head body is 90 °.

Preferably, the hammer head body is approximately a cuboid, and the hammer head body is made of hard alloy steel.

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

the rotary swaging hammer head for processing the hollow motor shaft disclosed by the invention can be used for carrying out rotary swaging on the hollow motor shaft with a complex external shape through one process, and is also suitable for rotary swaging of variable-diameter hollow shafts with various sizes. Through set up first arc surface and second arc surface on forging the face, in forging process, the second arc surface is at first forged the shaping with the blank forging with point contact, forges the shaping with line contact then, and first arc surface forges with the forging with face contact at last, makes the surperficial circularity of forging improve, and each excircle surface quality reaches high accuracy, finally utilizes first arc surface forging press forming hollow motor shaft corresponding section outline. The rotary swaging hammer head follows the principle of point-line-surface in the forging and pressing forming process, and improves the surface precision of the forged piece.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a rotary swaging hammer head disclosed by the invention;

fig. 2 is a schematic top view of the swaging hammer head disclosed in the present invention;

fig. 3 is a schematic front view of the rotary swaging hammer head disclosed in the present invention;

fig. 4 is a schematic side view of the swaging hammer head disclosed in the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1 and fig. 2, an embodiment of the invention discloses a swaging hammer head for processing a hollow motor shaft, which comprises a hammer head body 1, wherein the hammer head body 1 is approximately a cuboid, and the hammer head body 1 is provided with a mounting part 2 and a forging part 3 which is connected with the mounting part 2 into a whole. The top of the forging part 3 is provided with a plurality of forging and pressing surfaces 4 for forging and pressing the outline of the hollow motor shaft along the length direction of the hammer head body 1, the forging and pressing surfaces 4 are arranged in a step shape along the length direction of the hammer head body 1, and the adjacent forging and pressing surfaces 4 are in transition through a cambered surface. By adopting the technical scheme, the top of the forging part 3 of the rotary forging hammer head is provided with the plurality of forging and pressing surfaces 4 which are arranged in the ladder shape, so that the complex shape of the hollow motor shaft can be inosculated, the hollow motor shaft can be machined and formed through one procedure, meanwhile, the adjacent forging and pressing surfaces 4 are in transition through the cambered surface, the phenomenon that the connection part of the corresponding section of the motor shaft is wrinkled in the forging and pressing process is avoided, and the rotary forging hammer head is high in production efficiency and low in production cost.

Referring to fig. 4, each forging surface 4 is provided with a first circular arc surface 41 and a second circular arc surface 42 connected to each other. The first arc surface 41 is located at the center of the forging surface 4, two second arc surfaces 42 are provided and located at two sides of the first arc surface 41 respectively, and the axial leads of the two second arc surfaces 42 are coaxial. The diameter of the second arc surface 42 is equal to the diameter D of the blank forging, and the diameter of the first arc surface 41 is equal to the diameter D of the corresponding section of the hollow motor shaft. By adopting the technical scheme, in the forging process, the second arc surface 42 is firstly forged and formed with the blank forging piece in a point contact manner, then is forged and formed in a line contact manner, and finally the first arc surface 41 is forged with the forging piece in a surface contact manner, so that the surface roundness of the forging piece is improved, the surface quality of each excircle reaches high precision, and finally the first arc surface 41 is used for forging and forming the outer contour of the corresponding section of the hollow motor shaft. The rotary swaging hammer head follows the principle of point-line-surface in the forging and pressing forming process, and improves the surface precision of the forged piece.

In this embodiment, the axial length of each forging surface 4 is equal to the length of the corresponding section of the hollow motor shaft. The shape of the hollow motor shaft which is subjected to rotary swaging processing by the rotary swaging hammer head meets the design requirement.

Referring to fig. 3, the invention designs a swaging hammer head capable of processing four stages of hollow motor shafts, and each swaging surface 4 sequentially processes a first stage L1, a second stage L2, a third stage L3 and a fourth stage L4 of the hollow motor shaft from left to right. Each of the swaged surfaces 4 has a width gradually increasing and a depth gradually increasing as the diameter of the hollow motor shaft increases in the first stage L1, the second stage L2, the third stage L3 and the fourth stage L4. The outer diameter of the motor shaft corresponding to each stage is equal to the diameter of the first arc surface 41 on the corresponding forging surface 4. Therefore, the shape of the hollow motor shaft which is subjected to rotary swaging processing by the rotary swaging hammer head can be ensured to meet the design requirement.

Of course, the above-mentioned embodiments of the present invention are only for the rotary swaging hammer head designed for one hollow motor shaft, and the design concepts of other complicated hollow motor shafts are also applicable.

In the present embodiment, the mounting portion 2 includes two side wings 21 respectively disposed at both sides of the hammer head body 1, and the side wings 21 are used for fixing the hammer head body 1 on the swaging machine. The inclination of the side wings 21 is 45-60 degrees, and the side wings are conveniently arranged on the rotary swaging machine.

In this embodiment, the included angle α between the two radial side planes of the hammer head body 1 is 90 degrees, so that 4 rotary swaging hammer heads can be simultaneously installed on a rotary swaging machine, when a hollow motor shaft is subjected to rotary swaging, the radial side planes of the hammer head bodies 1 are mutually attached to form a rotary body, the inscribed circle diameter of the second arc surface 42 on each swaging surface 4 in the rotary body is the diameter of a blank forging, and the inscribed circle diameter of the first arc surface 41 on each swaging surface 4 is the outer diameter of the corresponding section of the hollow shaft.

The rotary swaging hammer head disclosed by the invention is made of hard alloy steel, preferably, tungsten alloy can be selected, so that the forging capability is improved, and the rotary swaging processing of a hollow motor shaft is met.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.