CN217798471U

CN217798471U - Extrusion die for oil grooves of thin-wall external spline gear hub

Info

Publication number: CN217798471U
Application number: CN202221738664.4U
Authority: CN
Inventors: 赵春燕; 高凤强; 刘川; 胡易; 苏涛
Original assignee: Chongqing Chuangjing Warm Forging Forming Co ltd
Current assignee: Chongqing Chuangjing Warm Forging Forming Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-11-15
Anticipated expiration: 2032-07-07

Abstract

The utility model discloses a thin wall external spline tooth hub oil groove extrusion die, including the extrusion terrace die that can reciprocate under the punching machine drives, be equipped with an extrusion die that has spline finishing chamber in the middle part below the extrusion terrace die, its characterized in that is equipped with a cylindric mold core in the extrusion die, the mold core sets up with the extrusion die is coaxial, and arranges the spline finishing intracavity in the mold core upper end, and the mold core can be in extrusion terrace die compound die in-process, is bulldozed the back and slides downwards, and after the compound die, forms a tooth hub extrusion chamber between upper end and the spline finishing chamber; a plurality of oil groove forming bulges used for forming oil grooves are arranged at the upper end of the mold core at intervals.

Description

Extrusion die for oil grooves of thin-wall external spline gear hub

Technical Field

The utility model relates to a tooth hub shaping preparation field, concretely relates to thin wall external splines tooth hub oil groove extrusion die.

Background

At present, the external spline gear hub is mostly formed by cold extrusion. In order to facilitate oil guiding, a plurality of oil grooves are arranged at the root part of the outer spline hub at intervals. The process for manufacturing the thin-wall external spline gear hub comprises the following steps: hot forging oil groove-cold extruding spline-turning-milling oil groove-removing oil groove burr-finished product (the structure of the finished product is shown in figure 1). Because the wall thickness of the external spline gear hub of preparation is less, when adopting the hot forging mode preparation oil groove, cause the oil groove easily not to lead to, the size is unstable, and the oil groove uniformity is poor, and the product is unqualified, mills the problem that the oil groove increases the cost. At the same time, the extruded splines are prone to dimensional inaccuracies.

In order to solve the problems, the applicant considers an improved process, firstly carries out hot forging treatment on a blank to form a formed product, then forms an oil groove in a cold extrusion mode, and shapes the spline so as to reduce the construction process and improve the production efficiency.

Disclosure of Invention

Not enough to the above-mentioned that prior art exists, the utility model aims to provide a can promote thin wall external splines tooth hub oil groove preparation precision to ensure that the oil groove is unblocked, increase the mould of oil groove shaping qualification rate.

In order to solve the technical problem, the utility model discloses a following technical scheme:

an oil groove extrusion die of a thin-wall external spline gear hub comprises an extrusion male die capable of moving up and down under the driving of a punching machine, wherein an extrusion female die with a spline finishing cavity in the middle is arranged below the extrusion male die; a plurality of oil groove forming bulges used for forming oil grooves are arranged at the upper end of the mold core at intervals.

Further, the upper end of the mold core is provided with a step, the step divides the mold core into an upper forming part and a lower fixing part, and a gear hub extrusion cavity is formed between the upper forming part and the inner wall of the spline finishing cavity.

Further, the oil groove molding protrusion is in an inverted L shape and is composed of a radial oil groove protrusion and a vertical oil groove protrusion, the radial oil groove protrusion radially establishes on the upper end face of the mold core by taking the center of the mold core as a circle center, and the vertical oil groove protrusion vertically arranges along the outer wall of the upper molding part.

Furthermore, the oil groove forming protrusions are four and are circumferentially and uniformly arranged by taking the axis of the mold core as the center.

Furthermore, the cross section of the oil groove forming bulge is triangular, and the middle part of the oil groove forming bulge protrudes upwards.

Furthermore, one end of each oil groove forming protrusion, which is close to the spline finishing cavity, is protruded upwards to form a chamfer boss.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. adopt the direct cold extrusion of mould once to accomplish the spline plastic of thin-walled spline tooth hub and extrude the oil groove, the oil groove forms at the extrusion in-process, and the oil groove size is comparatively stable, and the product uniformity is good, and the shaping is of high quality, simultaneously, can also effectively reduce product manufacturing procedure.

2. The upper part of the oil groove is provided with a chamfer boss, a chamfer is naturally formed, and the problem of burr adding of a finished product machine is solved.

3. The oil groove forming protrusion is composed of a radial oil groove protrusion and a vertical oil groove protrusion, so that the flow area of the oil groove is effectively increased, and the flowability of oil is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a molded thin-walled external spline hub;

FIG. 2 is a schematic view of an embodiment of an open mold state of an oil groove extrusion mold of a thin-wall external spline hub;

FIG. 3 is a schematic diagram of a mold clamping state of an oil groove extrusion mold of a thin-wall external spline hub in the embodiment;

FIG. 4 is a schematic perspective view of a mold core in the embodiment;

FIG. 5 is a schematic sectional view of the core in the example.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

The present application is further described below with reference to the accompanying drawings. As shown in fig. 2-5, the thin-wall external spline gear hub oil groove extrusion die provided by the embodiment includes an extrusion punch 1 capable of moving up and down under the driving of a punch, and an extrusion die 3 having a spline finishing cavity 31 at the middle part is arranged below the extrusion punch 1; a cylindrical mold core 4 is arranged in the extrusion female die 3, the mold core 4 and the extrusion female die 3 are coaxially arranged, the upper end of the mold core 4 is arranged in the spline finishing cavity 31 and can slide downwards after being pushed and pressed by a formed product when die assembly is carried out, so that an external spline gear hub on the formed product and the spline finishing cavity of the extrusion female die are extruded, and an external spline of the formed product is precisely shaped; a plurality of oil groove forming protrusions 44 for forming oil grooves are provided at intervals at the upper end of the mold core 4. As shown in fig. 2, before extrusion, the blank 2 is fixed at the lower end of the extrusion punch 1. Then, the extrusion punch 1 is driven by a pressure machine to move downwards, so that the blank 2 is driven by the extrusion punch 1 to push the mold core 4 to move downwards (to start mold closing), after moving downwards, when the lower end of the blank enters the spline finishing cavity 31, under the bidirectional action of the spline finishing cavity and the mold core 4, the spline is shaped, so that the spline is consistent with the designed size and the shape, and meanwhile, when the mold core 4 is extruded to a position where the blank cannot move, under the bidirectional action of the mold core 4 and the extrusion punch 1, the oil groove forming bulge 44 forms extrusion on the blank, and an oil groove is formed on the blank. Of course, in order to ensure that the mold core 4 can be moved axially and, after the closing of the mold, to return the pressing punch 1 to the initial position when it is moved upwards, an elastic element is provided under the mold core 4.

As shown in fig. 4 and 5, a step 41 is provided at the upper end of the mold core 4, the step 41 divides the mold core into an upper forming part 43 and a lower fixing part 42, and a gear hub extrusion cavity 5 is formed between the upper forming part 43 and the inner wall of the spline finishing cavity 31. The step can be matched with the lower end of the blank and limits the extrusion depth of the external spline gear hub.

As shown in fig. 4, the oil groove forming protrusion 44 is in an inverted L shape, and is composed of a radial oil groove protrusion 441 and a vertical oil groove protrusion 443, the radial oil groove protrusion 441 is radially disposed on the upper end surface of the mold core with the center of the mold core 4 as the center of a circle, and the vertical oil groove protrusion 443 is vertically disposed along the outer wall of the upper forming portion 43. This setting can effectively increase the shaping area of oil groove, ensures the disposable shaping of oil groove.

Specifically, the number of the oil groove forming protrusions 44 in this embodiment is four, and the protrusions are uniformly arranged in the circumferential direction around the axis of the mold core. The oil groove forming protrusion 44 has a triangular cross section and an upward middle portion (thus, the oil groove is formed in an inverted triangular shape as a whole, and oil can be guided well).

Further, the end of each oil groove-forming protrusion 44 adjacent to the spline finishing cavity is upwardly convex to form a chamfered boss 442. This chamfer boss wholly is the arc for form the chamfer naturally between the lateral wall of oil groove after the shaping and the back of the body one side of external splines tooth hub mutually, solve the finished product machine and add the burr problem.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that those modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all should be covered in the scope of the claims of the present invention.

Claims

1. An extrusion die for an oil groove of a thin-wall external spline gear hub comprises an extrusion male die capable of moving up and down under the driving of a punching machine, wherein an extrusion female die with a spline finishing cavity in the middle is arranged below the extrusion male die; a plurality of oil groove forming bulges used for forming oil grooves are arranged at the upper end of the mold core at intervals.

2. The thin-walled external spline hub oil groove extrusion die of claim 1, wherein the upper end of the die core is provided with a step, the step divides the die core into an upper forming part and a lower fixing part, and a hub extrusion cavity is formed between the upper forming part and the inner wall of the spline finishing cavity.

3. The thin-walled external spline hub oil groove extrusion die of claim 2, wherein the oil groove forming protrusion is inverted L-shaped and comprises a radial oil groove protrusion and a vertical oil groove protrusion, the radial oil groove protrusion is radially arranged on the upper end surface of the die core by taking the center of the die core as a circle center, and the vertical oil groove protrusion is vertically arranged along the outer wall of the upper forming part.

4. The thin-walled external spline hub oil groove extrusion die of claim 1, 2 or 3, wherein the number of the oil groove forming protrusions is four, and the four protrusions are circumferentially and uniformly arranged by taking the axis of the die core as a center.

5. The thin-walled external spline hub oil groove extrusion die of claim 4, wherein the oil groove forming bulge is triangular in cross section and the middle part is convex upward.

6. The thin-walled external spline hub oil groove extrusion die of claim 4, wherein each oil groove forming protrusion protrudes upward at an end adjacent to the spline finishing cavity to form a chamfered boss.