CN202779408U

CN202779408U - Sanitary can necking mold

Info

Publication number: CN202779408U
Application number: CN 201220238471
Authority: CN
Inventors: 杜传军; 罗晓亮
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2012-05-24
Filing date: 2012-05-24
Publication date: 2013-03-13
Anticipated expiration: 2022-05-24

Abstract

The utility model relates to a sanitary can necking mold which comprises two necking molds. The mold-entrance angle of a first necking mold is 26 - 29 degrees, and the radius of the mold-entrance angle is 6 - 8 millimeters. The mold-entrance angle of a second necking mold is 24 - 27 degrees. According to the sanitary can necking mold, the phenomenon of slopping shoulders of a sanitary can can be effectively avoided, the quality of finished products is improved, inferior-quality products are avoided, and cost is saved.

Description

A kind of built-up tin necking down mould

Technical field

The utility model relates to a kind of tank processed with two passage necking down moulds, particularly a kind of built-up tin necking down mould.

Background technology

Built-up tin for packings such as beverages need to be shaped to reduce tank mouth diameter through necking down usually, and the total necking down amount of tank mouth is larger, and the necking down passage that needs is also more.The necking down process realizes that by firm mould necking down as shown in Figures 1 and 2, every cover necking down mould comprises an external mold 1 and internal mold 2, has certain gap between external mold 1 and the internal mold 2.In forming process, under the axial thrust effect, the tank notch portion of tank body 3 enters external mold 1 interior generation necking down distortion, then enter and realize reducing of tank mouth diameter between the gap of external mold 1 and internal mold 2, internal mold 2 shapes are comparatively simple, are similar to cylindrical-shaped structure, external mold 1 then is tubular structure roughly, as shown in Figure 3, the inboard of external mold 1 has comparatively complicated contour shape, and Fig. 4 is the enlarged diagram of contour shape.

The built-up tin can body is to be welded, and it is large that commissure Thickness Ratio can body sheet metal thickness is wanted.Under normal conditions in order to prevent the necking down gauffer, inside and outside die clearance can not be too large, gap value may be less than commissure thickness, the surface smoothness of weld seam is not high simultaneously, this meeting causes the commissure that as shown in Figure 1 sunken shoulder phenomenon occurs so that commissure frictional resistance when the inside and outside die clearance is excessive easily.Sunken shoulder is excessive the buckling of causing of a kind of axial resistance, is comparatively common failure mode in the multi-pass necking down built-up tin tank process processed, and it not only can affect the sealing effectiveness of built-up tin finished product the generation of sunken shoulder, also can affect the production efficiency of tank process processed.

The shape of necking down mould produces the inboard profile that direct impact, especially external mold are arranged for the sunken shoulder phenomenon.Therefore, the axial load in the time of need to passing through to reduce necking down when mold shape designs is beneficial to eliminate the sunken shoulder phenomenon.Publication number is that the Japan Patent of JP 5212478A adopts mould structure as shown in Figure 3, and it is by the necking part (L0 section) of regulation shape and the straight body section (L1 section) that section is straight line, and hole enlargement conus portion (Lc section) forms.Straight body section and conus portion Length Ratio L1/Lc on axis direction are about 0.5, and the scope of conus portion coaxial line angle θ 2 is 34 °-38 °.When Length Ratio L1/Lc is excessive or too small greater than 0.5 times or conus portion coaxial line angle θ 2, all can be so that the axis direction resistance that jar is subject to become large, jar is buckled easily and is produced sunken shoulder.

As shown in Figures 1 and 2, for two passage necking down built-up tins, normally the shoulder after the first passage necking down is shaped produces sunken shoulder when the second necking down, and this is relevant with the design of necking down mold shape, because this position is the weakest in axial carrying capacity.The sunken shoulder that the built-up tin necking down produces is because the necking down shaping load has surpassed the axial carrying capacity of necking region; if there is no the gap of weld seam and interior outer mold is suitable; plastic force usually can be less than the axial carrying capacity of necking region during necking down; thereby can not produce sunken shoulder; but because there is weld seam in built-up tin; inside and outside die clearance may be less than throat depth; and face of weld fineness is not high; so that coefficient of friction increases between weld seam and mould; resistance increases when causing being shaped, and sunken shoulder will occur the axial carrying capacity that surpasses tank mouth weak part when shaping load.

Summary of the invention

The purpose of this utility model provides a kind of built-up tin necking down mould, and it is used for the necking down step of built-up tin manufacture process, the generation of sunken shoulder phenomenon in the time of can preventing necking down.

According to above-mentioned purpose, the utility model provides a kind of built-up tin necking down mould, it enters the mould inclination angle by reducing the first passage necking down (namely contracts) and the second passage necking down (i.e. two contractings) weak point, what increase simultaneously the first passage necking down enters the mould radius of corner, thereby increase the gap of the first passage necking down shoulder axial carrying capacity and the second passage necking down plastic force, improve margin of safety, avoid occuring the sunken shoulder phenomenon, in the second passage necking down mould, increase simultaneously a straight wall, this straight wall is arranged at the position of easy generation sunken shoulder, offset sunken shoulder outside active force when producing, can suppress equally the generation of sunken shoulder.Built-up tin necking down mould of the present utility model comprises:

Two passage necking down moulds, the modular angle that enters of the first passage necking down mould is 26～29 °, entering the mould radius of corner is 6～8mm; The modular angle that enters of the necking down mould of the second passage is 24～27 °.

Preferably, the port position of the necking down mould of the second passage is provided with always wall.

A kind of built-up tin necking down mould of the present utility model is owing to reduced the modular angle that enters of the first passage necking down and the second passage necking down, what increased again simultaneously the first passage necking down enters the mould radius of corner, thereby increase the gap of the first passage necking down shoulder axial carrying capacity and the second passage necking down plastic force, in the second passage necking down mould, increase simultaneously a straight wall, compared with prior art, it can prevent the generation of the sunken shoulder phenomenon of built-up tin effectively, improve the quality of finished product, prevent the generation of substandard products, save cost.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the structural representation of built-up tin necking down mould of the prior art.

Fig. 2 is the structural representation of built-up tin necking down mould of the prior art in the second passage necking down.

Fig. 3 is the cast outer mold structure schematic diagram of built-up tin necking down mould of the prior art.

Fig. 4 is the external mold size schematic diagram of a kind of built-up tin necking down mould in the first passage necking down.

Fig. 5 is the structural representation of a kind of built-up tin necking down mould in the second passage necking down among a kind of embodiment of the present utility model.

Fig. 6 is the external mold size schematic diagram of a kind of built-up tin necking down mould among a kind of embodiment of the present utility model.

Fig. 7 is the schematic diagram that concerns that the first passage and the second passage necking down mould enter modular angle and plastic force and axial carrying capacity.

Fig. 8 is the schematic diagram that the first passage and the second passage necking down mould enter modular angle and plastic force and axial carrying capacity difference.

Fig. 9 is the schematic diagram that concerns that the first passage and the second passage enter mould radius of corner and plastic force and axial carrying capacity.

Figure 10 is the schematic diagram that the first passage and the second passage enter mould radius of corner and plastic force and axial carrying capacity difference.

The specific embodiment

Below with reference to Figure of description a kind of built-up tin necking down mould described in the utility model is further described in detail.

Fig. 4 is the external mold size schematic diagram of a kind of built-up tin necking down mould in the first passage necking down, and Fig. 5 is the structural representation of a kind of built-up tin necking down mould among a kind of embodiment of the present utility model.

As shown in the figure, a kind of built-up tin necking down mould in the present embodiment has comprised two passage necking down moulds, be respectively the necking down mould of the first passage necking down mould and the second passage, the necking down mould of the first passage necking down mould and the second passage has all comprised external mold 1 and internal mold 2, and it acts on the tank body 3.The modular angle θ 1 that enters of the first passage necking down mould preferably is reduced to 26～29 ° from 31 ° of original measurement in the present embodiment, more preferably be reduced to 29 °, the mould radius of corner R1 that enters of the first passage necking down mould preferably increases to 6～8mm from the 5mm of original measurement, more preferably increase to 6mm, the modular angle θ 3 that enters of the necking down mould of the second passage preferably is reduced to 24～27 ° from 28 ° of original measurement, more preferably is reduced to 26 °.

Fig. 7 is the schematic diagram that concerns that the first passage and the second passage necking down mould enter modular angle and plastic force and axial carrying capacity, Fig. 8 is the schematic diagram that the first passage and the second passage necking down mould enter modular angle and plastic force and axial carrying capacity difference, Fig. 9 is the schematic diagram that concerns that the first passage and the second passage enter mould radius of corner and plastic force and axial carrying capacity, and Figure 10 is the schematic diagram that the first passage and the second passage enter mould radius of corner and plastic force and axial carrying capacity difference.

As shown in the figure, combine the mould inclination angle and enter the effect that the mould fillet is optimized, the plastic force of the second passage necking down this moment is reduced to 223Kgf from 232Kgf, the second passage necking down axial carrying capacity can be brought up to 305Kgf from 279Kgf simultaneously, and the difference of axial carrying capacity and plastic force is brought up to 82Kgf by 47Kgf during the second necking down.

As shown in the figure, the port position of the necking down mould of the second passage is provided with always wall L2, and the internal diameter of this straight wall L2 is identical with the straight wall internal diameter of a contracting, and the length of straight wall L2 is preferably more than or equal to 3mm in the present embodiment, thereby further improves axial carrying capacity.Combine the mould inclination angle, enter the effect that mould fillet and straight wall are optimized, this moment, axial carrying capacity can further be brought up to 322Kgf on the basis of 305Kgf, and the difference of axial carrying capacity and plastic force is brought up to 99Kgf by 82Kgf.

Be noted that above enumerate only for specific embodiment of the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art all should belong to protection domain of the present utility model from all distortion that the disclosed content of the utility model directly derives or associates.

Claims

1. a built-up tin necking down mould comprises two passage necking down moulds, it is characterized in that, the modular angle that enters of described the first passage necking down mould is 26～29 °, and entering the mould radius of corner is 6～8mm; The modular angle that enters of the necking down mould of described the second passage is 24～27 °.

2. built-up tin necking down mould as claimed in claim 1 is characterized in that, the port position of the necking down mould of described the second passage is provided with always wall.