CN102489537A

CN102489537A - Cold-extrusion molding method of lining core

Info

Publication number: CN102489537A
Application number: CN2011103854645A
Authority: CN
Inventors: 董阿能; 毛再娜
Original assignee: Ningbo Fushi Automobile Components Co Ltd
Current assignee: Ningbo Fushi Automobile Components Co Ltd
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2012-06-13

Abstract

The invention discloses a cold-extrusion molding method of a lining core, which is high in production efficiency, easy in quality control and high in yield and comprises the following steps: 1 punching a hole on a bland (4); and 2 molding the lining core (22) through a convex mold with a core rod. During the molding process, the core rod firstly penetrates into the hole so as to ensure dimension of the hole and provide support, then the peripheral part of the convex mold surrounding the core rod axially extrudes the blank (4) along the hole, and when the peripheral part moves to a preset position, the convex mold returns back. A space is reversed between the core rod and the peripheral part, and the space is equal to the wall thickness of the lining core (22).

Description

The cold-extrusion molding method of lining core

Technical field

The present invention relates to cold extrusion shaped technical field, specifically is a kind of cold-extrusion molding method that serves as a contrast core.

Background technology

The lining core is meant and is arranged in blind hole and with the same axis of blind hole and have the cylinder of axial hole; Concrete structure such as finished product shown in the drawings, at present, for said lining core is set in parts; Extensively adopt welding, these methods of turning to realize; But these two kinds of methods all have common defective, and that is exactly that production efficiency is low, and also there is the parts end product quality defective that difficulty is controlled, yields is low in welding.

Summary of the invention

The technical problem that the present invention will solve is, overcomes the shortcoming of above prior art, and the cold-extrusion molding method of the lining core that a kind of production efficiency is high, quality is controlled easily, yields is high is provided.

Technical scheme of the present invention is, a kind of cold-extrusion molding method that serves as a contrast core is provided, and may further comprise the steps 1, on blank, get a blind hole; 2, utilize the punch that has plug to get the lining core, in this process, plug at first stretches in the blind hole in order to guarantee the blind hole size and to provide support; Followed by; The periphery around plug of punch compresses axially blank along blind hole, after periphery moves to desired location, and the punch return; Be provided with spacing between said plug and the periphery, this spacing is the wall thickness of lining core.

After adopting said method, the present invention compared with prior art has following remarkable advantage and beneficial effect: the present invention adopts and on blank, gets earlier a blind hole; And then the method for playing the lining core, in the moulding lining core process, when periphery compresses axially blank along blind hole; It is mobile with the rightabout of the periphery direction of motion that a part of material of blank is understood court; In the inflow plug and the gap between the periphery that these materials have, the outer surface along periphery that has flows, like this; Reliablely and stablely moulding serves as a contrast core; Have cold extrusion shaped advantage, cold extrusion shaped advantage comprises that production efficiency is high, quality is controlled easily, yields high, thereby makes the present invention have production efficiency height, quality is controlled easily, yields is high advantage.

As improvement, said punch return refers to, periphery elder generation rollback, followed by, the plug rollback like this, more helps the control of moulding and Forming Quality.

Figure of description

Accompanying drawing is to utilize the present invention to serve as a contrast a kind of schematic flow sheet that has the joint that serves as a contrast core of cold-extrusion molding method moulding of core.

Shown in the figure, 1, first dashes rod, and 2, second dashes rod, 3, the first die benevolence, 4, blank, 5, first middleware; 6, the 3rd dash rod, the 7, the 4th dashes rod, 8, the second die benevolence, and the 9, the 5th dashes rod, and the 10, the 6th dashes rod, the 11, the 3rd die benevolence; 12, the 4th die benevolence, 13, second middleware, the 14, the 7th dashes rod, and the 15, the 8th dashes rod, the 16, the 3rd middleware, the 17, the 9th dashes rod; 18, the tenth dash rod, the 19, the 4th middleware, the 20, the 5th die benevolence, 21, finished product, 22, the lining core.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.

The present invention serves as a contrast the cold-extrusion molding method of core, may further comprise the steps 1, on blank 4, get a hole; 2, utilize the punch that has plug to get lining core 22, in this process, plug at first stretches in the hole in order to guarantee hole dimension and to provide support; Followed by; The periphery around plug of punch compresses axially blank 4 along the hole, after periphery moves to desired location, and the punch return; Be provided with spacing between said plug and the periphery, this spacing is the wall thickness of lining core 22.

Said punch return refers to, periphery elder generation rollback, followed by, the plug rollback.

Because a kind of joint that serves as a contrast core 22 that has shown in the accompanying drawing, it also has other structure except lining core 22, so in above-mentioned 2 steps, increase other 3 steps that adopt prior art, like this, complete step is specific as follows,

1, rush to the hole and lining core hole produces first middleware 5, this step is exactly that the present invention serves as a contrast the process of on blank 4, getting a hole in the cold-extrusion molding method of core, and last hole is exactly first blind hole; Lining core hole comprises second blind hole and the 3rd blind hole; Lining core hole comprises that the purpose of second blind hole and the 3rd blind hole is is to form lining core through hole the 2nd step to prepare, and makes according to the product design requirement, if product does not need through hole; Lining core hole also can only be the 3rd blind hole, the lining core hole that a said hole just is meant; First blind hole, second blind hole and the 3rd blind hole distribute from left to right in regular turn, and first blind hole, second blind hole and the 3rd blind hole are coaxial, and second blind hole falls within the first blind hole right-hand member and communicates with first blind hole; First dashes rod 1 and second is equipped with the projection that is used for the moulding blind hole towards excellent 2 ends; Projection is respectively applied for moulding second blind hole and the 3rd blind hole; First dashes rod 1 also is provided with the cylinder that is used for moulding first blind hole, and first dashes rod 1 and second dashes left end and the right-hand member that rod 2 lays respectively at blank 4; During moulding, at first blank 4 is placed the first die benevolence 3, first dash rod 1 and second then towards excellent 2 move toward one another.

2, blanking forms lining core through hole and produces second middleware 13; In this step, use the 3rd dash rod the 6 and the 4th dash rod 7, the three dash rod the 6 and the 4th towards excellent 7 lay respectively at first middleware 5 left end and right-hand member; The 3rd dashes rod 6 is provided with the columnar projections that runs through usefulness; The 3rd dashes rod 6 also is provided with the cylinder that matches with first blind hole, and the 4th dashes rod 7 and first middleware 5 right-hand members offsets, and the 4th dashes rod 7 is provided with the pilot hole that matches with the said columnar projections that runs through usefulness; During moulding, first middleware 5 is still stayed in the first die benevolence 3, and the 3rd dashes rod 6 moves right, and the 4th towards excellent 7 transfixions.

3, Heat-Shrinkable Tubings part and volume preformed produce the 3rd middleware 16; In this step; Use the 5th to dash rod the 9 and the 6th towards rod 10; Second middleware 13 is placed in the die cavity of the second die benevolence 8 and 11 amalgamations of the 3rd die benevolence, and the diameter in the moulding hole of the 3rd die benevolence 11 is less than the diameter in the moulding hole of the second die benevolence 8, and the 5th dashes rod the 9 and the 6th dashes left end and the right-hand member that rod 10 lays respectively at second middleware 13; The 5th dashes rod 9 is provided with and is used to guarantee the columnar projections that serves as a contrast the core clear size of opening and be used to support; The 5th dashes rod 9 also is provided with the cylinder that matches with first blind hole, and the 6th to dash rod 10 be exactly a cylinder, the 6th dash rod 10 the left side stretch in the moulding hole of the 3rd die benevolence 11; During moulding, the 5th dashes rod 9 moves right, and the 6th dashes rod 10 can be in the precalculated position transfixion in advance, also can move to the precalculated position left.

4, backward extrusion forms sleeve pipe and serves as a contrast core and produces the 4th middleware 19; This step is exactly that the present invention serves as a contrast and utilizes the punch that has plug to get the process of lining core 22 in the cold-extrusion molding method of core; In this step; Use the 7th to dash rod the 14 and the 8th towards rod 15; The 3rd middleware 16 still is placed in the die cavity of the second die benevolence 8 and 11 amalgamations of the 3rd die benevolence, and the 7th dashes rod the 14 and the 8th dashes left end and the right-hand member that rod 15 lays respectively at the 3rd middleware 16, and the 7th dashes rod 14 is provided with the cylinder that matches with first blind hole; The 8th to dash rod 15 be exactly that the present invention serves as a contrast the punch that has plug described in the cold-extrusion molding method of core, and the 7th dashes the pilot hole that rod 14 also is provided with the plug that is used to lead; During moulding, the 7th dashes rod the 14 and the 8th towards excellent 15 move toward one another, and the 7th dashes rod 14 should contact the 3rd middleware 16 left ends earlier so that the 3rd middleware 16 can be to left movement, and promptly the 3rd middleware 16 is that left end is static in the 4th one-step forming.

5, the blue final product that forms of upsetting squeeze platen press, this step is comparatively conventional, is specially; The die cavity that the 4th middleware 19 places the 4th die benevolence 12 and the 5th die benevolence 20 to constitute forms an intersegmental distance and is used for material and extrudes the formation flange between the 4th die benevolence 12 right sides and the 5th die benevolence 20 left sides, the 5th die benevolence 20 left sides center on the 4th middleware 19 and are provided with one section inclined-plane; Use the 9th to dash rod the 17 and the tenth towards rod 18; The 9th dashes rod 17 is provided with and is used to guarantee the columnar projections that serves as a contrast the core clear size of opening and be used to support, and the 9th dashes rod 17 also is provided with the cylinder that matches with first blind hole, and it is the same that structure fundamental sum the 5th is dashed rod 9; Just owing to be elongated through the 3rd, 4 step backsight core through holes; So columnar projections length will be grown, be at least the length of lining core through hole, the tenth to dash rod 18 be exactly the periphery of plug after taking away that dashes rod 15 with the 8th; During moulding, the 9th dashes rod the 17 and the tenth gets final product towards excellent 18 move toward one another extruding.

In this example, said blank material is SWCH15A, is SKH55/9 towards bar material respectively, and each die benevolence material is VA80.

Above-mentioned left and right directionality is described all based on shown in the accompanying drawing, in general, dashes rod for moving up and down.

Claims

1. a cold-extrusion molding method that serves as a contrast core is characterized in that, may further comprise the steps 1, on blank (4), get a hole; 2, utilize the punch that has plug to get lining core (22), in this process, plug at first stretches in the hole in order to guarantee hole dimension and to provide support; Followed by; The periphery around plug of punch compresses axially blank (4) along the hole, after periphery moves to desired location, and the punch return; Be provided with spacing between said plug and the periphery, this spacing is the wall thickness of lining core (22).

2. the cold-extrusion molding method of lining core according to claim 1 is characterized in that, said punch return refers to, periphery elder generation rollback, followed by, the plug rollback.