CN110125305A - A kind of Car Change-speed Gear Box Binding Gear hot trimming mold - Google Patents

Abstract

The present invention relates to an automobile gearbox combined tooth hot trimming mold, comprising an upper mold assembly and a lower mold assembly, the upper mold assembly is provided with a punching upper mold, and on the outside of the punching upper mold is provided a A trimming upper die for removing flash, the lower die assembly is provided with a trimming lower die, and the punching upper die cooperates with the trimming lower die to form a cavity. The present invention realizes the edge trimming after the hot forging of the combined teeth by designing a combined tooth hot edge trimming die, thereby canceling the flashing process of the original car, simplifying the process flow, greatly improving the production efficiency of the product, and releasing the raw material at the same time. The equipment production capacity of the car flashing process has produced significant economic benefits.

Description

A kind of mold for hot trimming of automobile gearbox combined with teeth

technical field

The invention relates to the field of mechanical processing, in particular to a deburring mold.

Background technique

Combining tooth parts are the key components in the gearbox, which play a role in synchronizing between the driven gear and the synchronizer and reducing the impact of shifting. At present, some of these parts are not conducive to the closed flash-free forging due to their large dimensions and complex structures. In order to reduce the forming pressure, open forging is generally used in the design of forging process to produce flash. The production process is: hot forging + punching → turning flash → surface cleaning → heat treatment → shot blasting → cold finishing. Although flash turning is a simple production process, it requires operations such as clamping, clamping, turning, and unloading, and the machining allowance of the flash part is large, the processing efficiency is low, and the tool loss is large. In mass production, it needs to occupy a large amount of lathe capacity, which is a bottleneck process in the production process of combined gears, restricting the company's delivery cycle and market competitiveness. With the development of hot die forging technology in our country, the application of multi-station hot die forging automatic production lines is becoming more and more extensive. If the edge can be cut hot after the combined tooth hot forging is formed, the production efficiency of the product will be greatly improved.

Contents of the invention

In order to solve the problems of complex flash removal process and low processing efficiency, the present invention provides a thermal edge trimming die for automobile gearbox, including an upper die assembly and a lower die assembly, and the upper die assembly is provided with The punching upper mold is provided with a trimming upper mold for cutting off flash on the outside of the punching upper mold, and the lower mold assembly is provided with a trimming lower mold, and the punching upper mold is connected with the trimming The lower mold cooperates to form the cavity.

As preferably, the upper mold includes an upper template, an upper top plate, an upper backing plate, and a punching upper mold connected in sequence, and a nitrogen spring is arranged in the upper template, and the nitrogen spring is used to push the upper mold installed on the upper top plate and the upper mold. A push rod in the upper backing plate, the push rod is connected with the punching upper die through screws.

Further, when the upper mold and the lower mold are closed, there is a safety gap between the upper backing plate and the punching upper mold, and the gap is larger than 5mm. The safety gap prevents the impact force of the slide block of the machine tool from being applied to the parts through the upper backing plate and the punching die, causing the parts to be severely deformed and scrapped.

Preferably, the matching gap between the trimming upper die and the punching upper die is 0.2-0.5 mm on one side. When trimming ends and the machine tool slider returns, prevent the parts from tilting in the inner cavity of the mold on the trimming edge, resulting in unsmooth demoulding.

Further, an ejection ring is provided on the outside of the trimming lower die. After the flash is cut, the ejection ring lifts the cut flash for a certain distance, so that the flash is separated from the edge trimming die, and then is clamped away by the mechanical jaws.

Preferably, when the upper mold and the lower mold are closed, there is a gap between the ejection ring and the trimming upper mold, and the gap is larger than the thickness of the flash. Prevent the secondary shearing of the flash during the pressing process of the trimming upper die.

Further, the lower mold includes a base, and a ejector pin is provided on the base, and the ejector pin is used to eject the ejection ring.

Beneficial effects: This patent realizes the edge trimming after hot forging of the combined teeth by designing a combination tooth hot edge trimming die, thereby canceling the flashing process of the original car, simplifying the process flow, and greatly improving the production efficiency of the product. The equipment production capacity of the flashing process of the original car has been released, resulting in significant economic benefits.

Description of drawings

Fig. 1 is a structural representation of the present invention;

1. Parts; 2. Punching upper mold; 3. Trimming lower mold; 4. Trimming upper mold; 5. Ejection ring; 6. Upper template; 7. Upper top plate; 8. Upper backing plate; 9. Nitrogen Spring; 10, push rod; 11, screw; 12, ejector rod; 13, base

Detailed ways

As shown in Fig. 1, a kind of mold of automobile transmission combined with tooth hot edge trimming comprises upper die assembly and lower die assembly, and described upper die assembly is provided with punching upper die 2, and in described punching upper die 2. A trimming upper die 4 for cutting flash is provided on the outside, and a trimming lower die 3 is provided on the lower die assembly, and the punching upper die 2 cooperates with the trimming lower die 3 to form a cavity. An ejection ring 5 is provided on the outside of the trimming lower die 3 .

The upper mold includes an upper template 6, an upper top plate 7, an upper backing plate 8, and a punching upper mold 2 connected in sequence, and a nitrogen spring 9 is arranged in the upper template 3, and the nitrogen spring 9 is used to push and be arranged on the The push rod 10 in the upper top plate 7 and the upper backing plate 8 is connected with the punching upper mold 2 through a screw 11 . When the upper mold and the lower mold are closed, a safety gap is set between the upper backing plate 8 and the punching upper mold 2, and the gap is greater than 5mm.

The matching gap between the trimming upper die 4 and the punching upper die 2 is 0.2-0.5 mm on one side. When the upper mold and the lower mold are closed, a gap is provided between the ejection ring 5 and the trimming upper mold 4, and the gap is larger than the thickness of the flash. The lower mold includes a base 13 on which a ejector rod 12 is arranged, and the ejector rod 12 is used for ejecting the ejection ring 5 .

Specific working principle: After the product is hot forged, use manual or walking beam jaws (or mechanical arms, etc.) to place the hot parts on the trimming lower die 3 with positioning function, the machine tool slide block is lowered, and the material is removed The lower end surface of the mold 2 first contacts the upper end surface of the part 1, and then the nitrogen spring 9 is stressed to generate sufficient reaction force, and the force is applied to the part through the upper top plate 7, the upper backing plate 8, and the punching upper mold 2 to prevent Parts jump during edge trimming, and provide blank holder force during edge trimming. Then, the machine tool slide block continues to descend, and the trimming upper die 4 contacts with the part flash and completes the eager trimming. Subsequently, the slide block returns. At this time, the punching upper die 2 provides a discharge force under the action of the nitrogen gas spring 9 to ensure that the parts are not lifted by the trimming upper die. When the slider returns to the highest point, the punching upper die 2 is separated from the part, and the ejector ring 5 will lift up the flash wrapped around the outer circle of the trimming lower die 3 under the action of the ejector rod 12, and then the jaws will fly Edge clamping away to complete the edge trimming process.

Claims (7)

1. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold, it is characterised in that: including upper die component and lower mold assemblies, it is described on Membrane module is equipped with dnockout upper mold (2), and the trimming upper mold (4) for cutting off overlap, institute are equipped on the outside of the dnockout upper mold (2) It states lower mold assemblies and cooperatively forms type chamber equipped with trimming lower die (3), the dnockout upper mold (2) and the trimming lower die (3).

2. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 1, it is characterised in that: the upper mold packet Sequentially connected cope plate (6), upper plate (7), upper padding plate (8) are included, is equipped with nitrogen gas spring (9) in the cope plate (6), it is described Nitrogen gas spring (9) is used to push the push rod (10) being arranged in the upper plate (7) and upper padding plate (8), and the push rod (10) is logical Screw (11) is crossed to connect with the dnockout upper mold (2).

3. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 2, it is characterised in that: when the upper mold When molding with lower die, safety clearance is equipped between the upper padding plate (8) and the dnockout upper mold (2), the gap is greater than 5mm.

4. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 1, it is characterised in that: in the trimming Mould (4) and dnockout upper mold (2) the fit clearance unilateral side are 0.2~0.5mm.

5. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 1, it is characterised in that: under the trimming Ejection ring (5) are equipped on the outside of mould (3).

6. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 5, it is characterised in that: when the upper mold When molding with lower die, gap is equipped between the ejection ring (5) and the trimming upper mold (4), the gap is greater than flash thickness.

7. a kind of Car Change-speed Gear Box Binding Gear hot trimming mold according to claim 5, it is characterised in that: the lower die packet It includes pedestal (13), the pedestal (13) is equipped with mandril (12), and the mandril (12) is used to eject the ejection ring (5).