阅读说明：本技术 一种齿圈的锻造模具 (Forging die for gear ring ) 是由 刘步蟾 冯娟 赵梦逸 于 2018-08-21 设计创作，主要内容包括：本发明提供一种齿圈的锻造模具,包括主模、芯辊,所述主模和所述芯辊之间设置有锻件,所述芯辊自上而下依次分为上尖段、中间段、下尖段三个部分,所述中间段邻近于所述下尖段的一端设置有大斜角的凹槽。本发明通过在芯辊上设置大斜角的凹槽,尤其将凹槽的下斜面与水平面的夹角α设计为38～42°,不仅使料坯方便进料,避免夹皮,而且使齿轮斜面金属纤维流方向连贯,使齿轮的抗拉和冲击性能达到使用的要求。(The invention provides a forging die of a gear ring, which comprises a main die and a core roller, wherein a forging piece is arranged between the main die and the core roller, the core roller is sequentially divided into an upper sharp section, a middle section and a lower sharp section from top to bottom, one end of the middle section, which is adjacent to the lower sharp section, is provided with a groove with a large oblique angle, and the included angle α between the lower oblique plane of the groove and the horizontal plane is designed to be 38-42 degrees, so that a material blank is conveniently fed, the skin clamping is avoided, the metal fiber flow direction of the oblique plane of the gear is coherent, and the tensile property and the impact resistance of the gear meet the using requirements.)

1. The forging die for the gear ring is characterized by comprising a main die (1) and a core roller (2), wherein a forging (3) is arranged between the main die (1) and the core roller (2), the core roller (2) is sequentially divided into an upper sharp section (201), a middle section (202) and a lower sharp section (203) from top to bottom, and one end, adjacent to the lower sharp section (203), of the middle section (202) is provided with a groove (204) with a large oblique angle.

2. The ring gear forging die of claim 1, wherein the groove (204) is composed of an upper inclined surface, a vertical surface and a lower inclined surface, and the angle α between the lower inclined surface and the horizontal surface is 38-42 °.

3. The forging die for the gear ring according to claim 2, wherein the angle between the upper inclined surface and the horizontal plane is 116-119 °.

4. The ring gear forging die set of claim 4, wherein the intermediate section (202) is of cylindrical configuration.

5. The forging die for ring gear according to claim 4, wherein the forging (3) is a gear.

Technical Field

The invention relates to the field of machinery, in particular to a forging die for a gear ring.

Background

The die is a tool for making a blank into a finished piece with a specific shape and size under the action of external force, and is widely used for blanking, forming stamping, die forging, cold heading, extrusion, powder metallurgy piece pressing, pressure casting and the forming processing of compression molding or injection molding of products such as engineering plastics, rubber, ceramics and the like. The die has a specific contour or cavity shape, and the blank can be separated (blanked) according to the contour shape by applying the contour shape with the cutting edge. The blank can obtain a corresponding three-dimensional shape by using the shape of the inner cavity.

The gear ring is embedded on the outer edge of the flywheel after being heated, and is fastened on the outer edge of the flywheel after being cooled, and is used for being meshed with a starter gear to drive the crankshaft to rotate and start the engine. However, the ring gear is usually made of 45 or 40Cr multi-alloy steel, which has high metal stress and is difficult to form.

Disclosure of Invention

The invention provides a forging die for a gear ring, which aims to solve the problem that the gear ring is difficult to form in the prior art.

In order to solve the technical problem, the invention provides a forging die for a gear ring, which comprises a main die and a core roller, wherein a forging piece is arranged between the main die and the core roller, the core roller is sequentially divided into an upper sharp section, a middle section and a lower sharp section from top to bottom, and one end of the middle section, which is adjacent to the lower sharp section, is provided with a groove with a large bevel angle.

Preferably, the groove consists of an upper inclined plane, a vertical plane and a lower inclined plane, and an included angle α between the lower inclined plane and the horizontal plane is 38-42 degrees.

Preferably, the included angle between the upper inclined plane and the horizontal plane is 116-119 degrees.

Preferably, the middle section is of a cylindrical structure.

Preferably, the forging is a gear.

The forging die for the gear ring has the beneficial effects that the grooves with large oblique angles are arranged on the core roller, particularly, the included angle α between the lower oblique plane of each groove and the horizontal plane is designed to be 38-42 degrees, so that the blank is convenient to feed, the skin is prevented from being clamped, the metal fiber flow direction of the oblique plane of the gear is coherent, and the tensile property and the impact property of the gear meet the using requirements.

Drawings

Fig. 1 is a schematic view of the entire structure of a forging die for a ring gear according to an embodiment of the invention.

Fig. 2 is a schematic view of the core roller structure of the forging die for the ring gear according to the embodiment of the invention.

The forging method comprises the following steps of 1-main die, 2-core roller, 201-upper sharp section, 202-middle section 203-lower sharp section, 204-groove and 3-forging.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of the overall structure of a forging die for a ring gear according to an embodiment of the present invention, and fig. 2 is a schematic view of the core roller structure of the forging die for a ring gear according to an embodiment of the present invention.

As shown in fig. 1 and 2, the forging die for the gear ring provided by the invention comprises a main die 1 and a core roller 2, wherein a forging piece 3 is arranged between the main die 1 and the core roller 2. The core roller 2 is sequentially divided into an upper sharp section 201, a middle section 202 and a lower sharp section 203 from top to bottom, and one end of the middle section 202, which is adjacent to the lower sharp section 203, is provided with a groove 204 with a large bevel angle.

Further, the groove 204 is composed of an upper inclined plane, a vertical plane and a lower inclined plane, an included angle α between the lower inclined plane and the horizontal plane is 38-42 degrees, an included angle between the upper inclined plane and the horizontal plane is 116-119 degrees, and the middle section 202 is of a cylindrical structure.

In the embodiment, the forged piece 3 is a special gear for a train, the material of the gear is multi-alloy steel, 40CrNiMO, the more alloy elements, the greater metal stress and the harder the forming. And the gear ring is used for the train, so the requirement on the internal performance of the gear ring is high, the metal streamline is coherent, and the requirements on the tensile performance and the impact performance are high. According to the characteristics of the gear ring, the mold is designed according to the shape of the gear ring, and the design of a large oblique angle of 40 degrees is adopted, so that the blank is convenient to feed, the skin is prevented from being clamped, the flow direction of the metal fibers on the inclined surface of the gear is coherent, and the higher performance is achieved.

In conclusion, the forging die for the gear ring provided by the invention has the advantages that the grooves with large oblique angles are arranged on the core roller, particularly, the included angle α between the lower oblique surfaces of the grooves and the horizontal plane is designed to be 38-42 degrees, so that the blank is convenient to feed, the skin is avoided, the metal fiber flow direction of the oblique surfaces of the gear is continuous, and the tensile and impact resistance of the gear can meet the using requirements.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.