CN205341780U - Castellated gear cold extruding die of high accuracy - Google Patents

Abstract

The utility model discloses a high-precision tooth-shaped cold extrusion die. A tooth-shaped cold-extrusion upper die is arranged on the upper die base, and a tooth-shaped cold-extrusion lower die is correspondingly arranged under the tooth-shaped cold-extrusion upper die. The tooth-shaped cold extrusion upper die and the tooth-shaped cold-extrusion lower die are corresponding to each other, and the gear cold-extrusion cavity is formed after the dies are closed; the tooth-shaped cold-extrusion lower die is set on the lower die holder; the tooth-shaped cold-extrusion An ejector is set under the lower die, and the ejector passes into the forming cavity of the tooth-shaped cold extrusion lower die; a spring is arranged under the ejector, and the spring pushes the ejector upward to generate ejection action during demoulding. The cold extrusion die of the utility model can manufacture gears through the method of forging through the combination of cold forging and hot compound precision forging, with high forming precision, reduced cost of parts, improved mechanical strength of products, and conveniently obtained The gear tooth shape is difficult to manufacture and meets the process requirements; it greatly reduces equipment investment and improves the production efficiency of parts.

Description

High-precision gear cold extrusion die

technical field

The utility model relates to a cold extrusion die of a gear, in particular to a high precision cold extrusion die of a P gear parking gear of an automobile DCT automatic transmission.

Background technique

The P-block parking gear of the automobile DCT automatic transmission is a key part of the P-block of the automobile automatic transmission. It is very important for the safe parking of the car. Its quality directly affects the safety of the car during parking. Sliding occurs on slopes less than 30 degrees. The parking gear is generally set on the output shaft, and it is in an idling state at ordinary times. When parking, the parking pawl engages and locks the output shaft through the action of the P shift fork. Thereby realizing the P gear parking requirement. In the prior art, the traditional processing method of the gear is wire-cut electric machining or large-scale vertical broaching machine processing, but the processing is difficult and slow, and requires high-precision wire-cutting equipment and large-scale vertical broaching machine processing equipment, and the investment In addition, there are also shortcomings such as low material utilization, high overall cost, poor tooth profile strength, and lack of market competitiveness. Moreover, the profile of the parking rectangular tooth surface is high in accuracy and the roughness reaches a roughness of 1.6 or more, making it very difficult to manufacture.

Contents of the invention

The utility model aims at the above-mentioned shortcomings in processing the parking gears of DCT automatic transmissions of automobiles in the prior art, and provides a tooth-shaped mold for cold extrusion processing, which adopts the method of precision forging to manufacture high-precision gears through cold and hot compound precision forging. Shaped cold extrusion dies, especially tooth-shaped cold extrusion dies for P-block parking gears of automobile DCT automatic transmissions.

The technical scheme of the utility model: a high-precision tooth-shaped gear cold extrusion die, including an upper mold base and a lower mold base, is characterized in that: a tooth-shaped cold-extrusion upper die is arranged on the upper mold base, and the tooth-shaped cold extrusion die Below the extrusion upper die, a tooth-shaped cold extrusion lower die is correspondingly arranged, and the forming cavities of the tooth-shaped cold extrusion upper die and the tooth-shaped cold extrusion lower die correspond to each other, and the gear cold extrusion cavity is formed after the dies are closed; The lower die for tooth-shaped cold extrusion is set on the lower die seat; the ejector is set under the lower die for tooth-shaped cold extrusion, and the ejector is connected into the forming cavity of the lower die for tooth-shaped cold extrusion; under the ejector, a spring is arranged, When demoulding, the spring pushes the ejector to move upwards to generate ejection action.

A further feature is: the spring is a nitrogen gas spring, a backing plate is arranged under the spring, and the spring is supported on the backing plate.

The lower end of the ejector and the spring are all arranged in the vertical groove of the lower bearing plate, and the spring drives the ejector to move up and down in the groove to generate the ejecting action.

The lower die fixing ring is set around the tooth-shaped cold extrusion lower die, the lower die fixing ring is supported on the lower bearing plate, the lower bearing plate is set on the lower backing plate, and the lower bearing plate and/or the lower backing plate are supported on the lower die base .

The upper pressure ring is set under the upper mold base, and the lower pressure plate is set above the lower mold base, all of which are detachable connections.

Compared with the prior art, the gear cold extrusion die with high-precision tooth shape of the utility model has the following characteristics:

1. Through the combination of cold forging and thermal compound precision forging, the P-block parking gear of automobile DCT automatic transmission can be manufactured by forging method, which has high forming precision, reduces the cost of parts, improves the mechanical strength of the product, and is convenient Obtaining the gear tooth shape is difficult to manufacture and meets the process requirements.

2. There is no need to use high-precision EDM equipment, which greatly reduces equipment investment.

3. Substantially improve the production efficiency of parts and components to meet the needs of the market.

Description of drawings:

Fig. 1 is the gear cold extrusion die of the present utility model.

detailed description

As shown in Fig. 1, the gear cold extrusion mold with high precision tooth shape of the present invention comprises an upper mold base 1 and a lower mold base 2, and the upper mold base 1 is provided with a tooth-shaped cold extrusion upper die 3, one of which in the figure A specific structure is that an upper backing plate 4 is set on the upper die base 1, and the tooth-shaped cold extrusion upper die 3 is arranged under the upper backing plate 4. During forging operation, the tooth-shaped cold extrusion upper die 3 and the upper backing are driven by the power device. The plate 4 moves up and down synchronously, and the tooth-shaped cold extrusion upper die 3 acts as an equipment slider to exert force on the blank.

Under the tooth-shaped cold extrusion upper die 3, a tooth-shaped cold-extrusion lower die 5 is correspondingly arranged, and the forming cavities (including tooth shapes, etc.) of the tooth-shaped cold-extrusion upper die 3 and the tooth-shaped cold-extrusion lower die 5 correspond to each other, all according to The process requires production, and an inverted cone cavity is formed after the mold is closed, that is, the gear cold extrusion cavity 6, and the forming cavity of the tooth-shaped cold extrusion lower die 5 is a tapered inner cavity; during the extrusion operation, the product to be extruded Putting it into the gear cold extrusion cavity 6, the gear of the utility model can obtain the tooth profile precision extrusion in the gear cold extrusion cavity 6, so as to meet the shape and precision required by the process. The tooth-shaped cold extrusion upper die 3, the tooth-shaped cold extrusion lower die 5, and the gear cold extrusion cavity 6 are determined according to the process requirements to meet the needs of cold extrusion related gears.

An ejector 7 is arranged under the tooth-shaped cold extrusion lower die 5, and the upper end of the ejector 7 (outer circle with a toothed part) can pass into the forming cavity of the tooth-shaped cold extrusion lower die 5, and when demolding Moving up, a force is exerted on the workpiece to be extruded below, and the workpiece is ejected from the gear cold extrusion cavity 6; under the ejector 7, a spring 8 is set, and the spring 8 is a nitrogen spring. The spring 8 pushes the ejector 7 to move upward to generate the ejection action. The spring 8 is supported on the backing plate 9, the lower end of the ejector 7 and the spring 8 are all arranged in the lower bearing plate 11, specifically in the vertical groove of the lower bearing plate 11, and the spring 8 drives the ejector 7 in the groove. The inside moves up and down to generate the ejection action.

During the extrusion operation, the product to be extruded in the gear cold extrusion cavity 6 starts to move downward under the action of the tooth-shaped cold extrusion upper die 3, and at the same time, the ejector 7 compresses the nitrogen spring 8 to produce a reaction The bottom surface of the product to be extruded is pressed tightly, which prevents the product from being extruded from shifting and turning over, and at the same time plays a role in improving the precision of the product. After the extrusion is completed, the cold extrusion upper die 3 is lifted, and the ejector 7 ejects the extruded product under the action of the spring 8 .

The tooth-shaped cold extrusion lower die 5 is set on the lower die base 2, a specific structure in the figure, the lower die fixing ring 10 is arranged around the tooth-shaped cold extrusion lower die 5, and the lower die fixing ring 10 is supported on the lower bearing plate 11 , the lower bearing plate 11 is set on the lower backing plate 12 , and the lower bearing plate 11 and/or the lower backing plate 12 are supported on the lower mold base 2 .

An upper press ring 13 is set below the upper die base 1, and a lower pressing plate 4 is set above the lower die base 2, all of which are detachably connected.

When the extrusion operation is working, first put the appropriate blank of the product to be extruded (the blank of the P gear parking gear) into the inverted cone cavity, and place it in the gear cold extrusion cavity 6; the matched press drives The upper mold base 1 and the upper mold 3 move downward, and the tooth-shaped cold extrusion upper mold 3 acts as an upper slider to exert force on the blank during the downward process, so that the blank is extruded in the inverted cone cavity to obtain the required Shape, dimensional accuracy, positional accuracy and surface finish.

Claims (5)

1. High-precision gear cold extrusion die, including upper die base (1) and lower die base (2), characterized in that: the upper die base (1) is provided with a toothed cold extrusion upper die ( 3), under the tooth-shaped cold extrusion upper die (3), correspondingly set the tooth-shaped cold-extrusion lower die (5), the forming type of the tooth-shaped cold-extrusion upper die (3) and the tooth-shaped cold-extrusion lower die (5) The cavities correspond to each other, and an inverted conical gear cold extrusion cavity (6) is formed after the mold is closed; the tooth-shaped cold extrusion lower die (5) is set on the lower die base (2); the tooth-shaped cold extrusion lower die ( The ejector (7) is set under 5), and the ejector (7) passes into the forming cavity of the tooth-shaped cold extrusion lower die (5); under the ejector (7), a spring (8) is arranged, When demoulding, the spring (8) pushes the ejector (7) to move upwards to generate the ejection action. 2. The high-precision gear cold extrusion die according to claim 1, characterized in that: the spring (8) is a nitrogen spring, and a backing plate (9) is arranged under the spring (8), and the spring (8) Supported on the backing plate (9). 3. The high-precision gear cold extrusion die according to claim 2, characterized in that: the lower end of the ejector (7) and the spring (8) are all set in the vertical groove of the lower bearing plate (11) , the spring (8) drives the ejector (7) to move up and down in the groove to generate the ejection action. 4. According to any one of claims 1 to 3, the high-precision toothed gear cold extrusion die is characterized in that: a lower die fixing ring (10) is arranged around the tooth shape cold extrusion lower die (5), and the lower die fixing ring (10) Supported on the lower bearing plate (11), the lower bearing plate (11) is then set on the lower backing plate (12), the lower bearing plate (11) and/or the lower backing plate (12) are supported on the lower mold base (2) up. 5. According to any one of claims 1 to 3, the gear cold extrusion die with high-precision tooth shape is characterized in that: the upper pressure ring (13) is set under the upper die base (1), and the lower die base (2) The lower pressing plate (4) is set to be detachably connected.