CN-224208814-U - Secondary extrusion forming device for intermediate shaft blank

CN224208814UCN 224208814 UCN224208814 UCN 224208814UCN-224208814-U

Abstract

The utility model relates to a secondary extrusion molding device for a middle shaft blank, which comprises an upper template and a lower template which are corresponding up and down, wherein the top surface of the lower template is fixedly provided with a lower die core with a lower tooth blank positioning core hole, two sides of the lower die core are provided with sliding die holders capable of sliding transversely, the opposite sides of the two die holders are provided with core grooves, the upper part forms a round table structure during die assembly, the core grooves are combined to form an upper tooth blank forming core hole coaxially communicated with the lower tooth blank positioning core hole, the bottom surface of the upper template is fixedly provided with an outer limit seat, a sliding hole penetrates through the outer limit seat in the vertical direction, the sliding hole is internally provided with an inner limit sleeve capable of sliding vertically, the inner limit sleeve is provided with a limit hole, the round table part of the sliding die holder is fixed on the upper die plate at the inner side of the limit hole and is provided with an extrusion core hole, the lower end of the inner limit sleeve is wedged in the round table part of the sliding die holder during die assembly, and then the upper die core is pressed down to finish blank extrusion molding.

Inventors

CHEN YIMING
JING YONG
HU BIN
CHEN ZHONG
HU QIJIANG

Assignees

重庆升科精锻科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250516

Claims (9)

1. The secondary extrusion forming device for the intermediate shaft blank comprises an upper die plate and a lower die plate which are arranged oppositely up and down, and is characterized in that a lower die core is fixedly connected to the top surface of the lower die plate, a lower tooth blank positioning core hole is formed in the top of the lower die core along the vertical direction, sliding die holders are respectively arranged on the top surface of the lower die plate and positioned on two sides of the lower die core, core grooves are formed in the opposite sides of the two sliding die holders along the vertical direction, the core grooves are through grooves, when the two sliding die holders are matched in the opposite directions, the upper parts of the two sliding die holders can be formed into a circular truncated cone-shaped structure, and the two core grooves can be folded to form an upper tooth blank forming core hole which is concentric with and communicated with the lower tooth blank positioning core hole; The upper die plate is characterized in that an outer limit seat is fixedly connected to the bottom surface of the upper die plate and located above the lower die core, a sliding hole is formed in the outer limit seat in a penetrating manner in the vertical direction, an inner limit sleeve which is in sliding fit with the sliding hole in the vertical direction is arranged on the outer limit seat, a limit part which can limit the upper end of the inner limit sleeve to slide out of the lower end of the sliding hole is arranged on the outer limit seat, the inner limit sleeve is provided with a limit hole which is penetrated in the vertical direction, an upper die core is fixedly connected to the bottom surface of the upper die plate and located inside the limit hole, an extrusion core hole which is coaxial with the lower tooth blank positioning core hole is formed in the bottom of the upper die core, when the upper die plate moves downwards, a round table-shaped upper structure formed by two sliding die holders after die assembly can extend into the lower end of the limit hole to be in wedge fit with the limit hole, and after the two sliding die holders after die assembly, the upper die plate can move downwards to enable the upper die core to extrude blanks to be processed.
2. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein a plurality of telescopic springs are arranged in the limiting hole and positioned between the inner limiting sleeve and the upper die plate, the telescopic springs are uniformly arranged at intervals around the central line direction of the limiting hole, spring mounting holes in the vertical direction are concavely arranged on the upper end face of the inner limiting sleeve and the bottom face of the upper die plate, corresponding to the positions of the telescopic springs, respectively, and two ends of the telescopic springs extend into the spring mounting holes on the corresponding sides respectively and are abutted to the bottoms of the spring mounting holes.
3. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein the limiting portion comprises a plurality of sliding grooves which are arranged on the inner wall of the sliding hole and uniformly spaced around the central line direction of the sliding hole, the sliding grooves extend downwards from the upper end of the sliding hole along the vertical direction, sliding blocks are respectively formed at positions, corresponding to the sliding grooves, of the upper end of the sleeve body of the inner limiting sleeve in a protruding mode, and the sliding blocks extend into the corresponding sliding grooves and can be in sliding fit with the sliding grooves along the extending direction of the sliding grooves.
4. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein a die core mounting hole is concavely formed in the upper surface of the lower die plate, the lower end of the lower die core is in clearance fit in the die core mounting hole, a press-fitting convex ring which is annularly arranged around the circumference of the lower die core is formed on the periphery of the lower die core in a protruding mode, a pressing plate which acts on the press-fitting convex ring to press the lower die core on the die core mounting hole bottom is fixedly connected to the lower die plate, and the sliding die holder is located on the surface of the pressing plate.
5. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein the die holder driving device for driving the two sliding die holders to perform die separation and die assembly operation is further arranged on the lower die plate and positioned on the back sides of the two sliding die holders, and the sliding die holders can slide on the lower die plate along the opposite or opposite directions of the two sliding die holders under the driving of the die holder driving device.
6. The secondary extrusion molding device of the intermediate shaft blank according to claim 5, wherein a plurality of oil grooves are formed in a contact surface of the bottom of the sliding die holder, which is in contact with the lower die plate, the oil grooves are through grooves and extend in a direction parallel to the sliding direction of the sliding die holder, and the plurality of oil grooves are arranged at intervals in a direction perpendicular to the sliding direction of the sliding die holder.
7. The secondary extrusion molding device of a jackshaft blank according to claim 5, wherein guide strips fixedly connected with the lower die plate are respectively arranged on two sides of the two sliding die holders along the moving direction of the two sliding die holders, the sliding die holders comprise sliding plates arranged on the top surface of the lower die plate and between the two guide strips, and a molding module fixed on the top surface of the sliding plates, the core grooves are arranged on the molding module, and wedge-shaped guide surfaces which are in sliding fit with each other and extend along the moving direction parallel to the two sliding die holders are respectively formed between the sliding plates and the guide strips on the sides of the sliding die holders.
8. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein the bottom of the lower tooth blank positioning core hole is provided with an ejector rod upper hole which is coaxial with the lower tooth blank positioning core hole in a penetrating way, the diameter of the ejector rod upper hole is smaller than that of the bottom of the lower tooth blank positioning core hole, and the lower die plate is provided with an ejector rod lower hole which is coaxial with the ejector rod upper hole in a penetrating way at a position corresponding to the ejector rod upper hole.
9. The secondary extrusion molding device for the intermediate shaft blank according to claim 1, wherein the lower die plate is fixedly connected with a guide pipe which extends vertically, the upper die plate is fixedly connected with a guide post which is arranged on the same center line as the guide pipe, and the lower end of the guide post extends into an inner hole of the guide pipe and can be in sliding fit with the guide pipe along the vertical direction.

Description

Secondary extrusion forming device for intermediate shaft blank Technical Field The utility model relates to the field of gear shaft machining, in particular to a secondary extrusion forming device for a middle shaft blank. Background The intermediate shaft is used as a core component of a mechanical transmission system and is widely used for bearing torque transmission and rotation support functions in various power equipment. In the conventional intermediate shaft machining process, in particular to the intermediate shaft manufacturing process with a double-gear structure, a machining mode that an integral forging blank is subjected to turning forming is generally adopted. Specifically, a machining enterprise firstly prepares a solid cylindrical blank with the diameter equivalent to the maximum outer diameter of the tooth blank, then sequentially carries out cutting machining on a connecting area between the tooth blanks through a numerical control lathe, and finally forms a shaft body structure meeting the design requirement. However, the conventional machining method has the obvious technical defects that when the axial distance between two tooth blanks is too long, a large amount of material in the middle area needs to be removed by cutting, so that not only is serious waste of metal material caused, but also the machining period is prolonged, the cutter loss is increased, and the comprehensive production cost is obviously increased. In view of the above technical bottlenecks, those skilled in the art are beginning to explore the application of plastic forming techniques. Through finite element simulation analysis, the cutting allowance can be effectively reduced by adopting a step extrusion process on the premise of ensuring the continuity of a material streamline. However, in practical application, after the first tooth blank is extruded for the first time, the axle blank needs to be clamped again, the positioning reference of the axle blank also changes, and the control of the phase relation and the axial distance between the two tooth blanks needs to be ensured. Therefore, how to design a forming die capable of meeting the requirements of secondary clamping and positioning of the shaft blank, the phase relation between two tooth blanks and the axial distance needs to be further considered. Disclosure of utility model Aiming at the defects of the prior art, the utility model aims to provide a secondary extrusion forming device for an intermediate shaft blank, which can meet the requirements of secondary clamping and positioning of a shaft blank, the phase relation between two tooth blanks and the axial distance. In order to solve the technical problems, the utility model adopts the following technical scheme: The secondary extrusion forming device for the intermediate shaft blank comprises an upper die plate and a lower die plate which are oppositely arranged up and down, wherein a lower die core is fixedly connected to the top surface of the lower die plate, a lower tooth blank positioning core hole is formed in the top surface of the lower die core along the vertical direction, sliding die holders are respectively arranged on the top surface of the lower die plate and positioned at two sides of the lower die core, core grooves are formed in the opposite sides of the two sliding die holders along the vertical direction, the core grooves are through grooves, when the two sliding die holders are matched with each other towards opposite directions, the upper parts of the two sliding die holders can be formed into a circular truncated cone-shaped structure, and the two core grooves can be folded to form an upper tooth blank forming core hole which is concentric with and communicated with the lower tooth blank positioning core hole; The upper die plate is characterized in that an outer limit seat is fixedly connected to the bottom surface of the upper die plate and located above the lower die core, a sliding hole is formed in the outer limit seat in a penetrating manner in the vertical direction, an inner limit sleeve which is in sliding fit with the sliding hole in the vertical direction is arranged on the outer limit seat, a limit part which can limit the upper end of the inner limit sleeve to slide out of the lower end of the sliding hole is arranged on the outer limit seat, the inner limit sleeve is provided with a limit hole which is penetrated in the vertical direction, an upper die core is fixedly connected to the bottom surface of the upper die plate and located inside the limit hole, an extrusion core hole which is coaxial with the lower tooth blank positioning core hole is formed in the bottom of the upper die core, when the upper die plate moves downwards, a round table-shaped upper structure formed by two sliding die holders after die assembly can extend into the lower end of the limit hole to be in wedge fit with the limit hole, and after the two sliding die holders after die assembly, the