CN2897840Y

CN2897840Y - Metal pressure-resisting can lid

Info

Publication number: CN2897840Y
Application number: CN 200620073256
Authority: CN
Inventors: 安旭
Original assignee: SILAIKE PRECISION EQUIPMENT CO Ltd SUZHOU
Current assignee: SILAIKE PRECISION EQUIPMENT CO Ltd SUZHOU
Priority date: 2006-05-27
Filing date: 2006-05-27
Publication date: 2007-05-09
Anticipated expiration: 2016-05-27

Abstract

The utility model relates to a pressure-resistant metal pop cap, which comprises a cap body and a pull ring; wherein, a pull ring is riveted on the body; a concave countersink is arranged from the outer edge to the center, a convex boss is arranged in the center of the concave countersink. The utility model is characterized in that: the angle A of the countersink ranges from 15 to 60 degrees, cold work hardening forging indentation is arranged in section B1 and B2 of section B radian at the bottom of the convex boss, as well as step C section turning corner around the center of the cover. By adopting the new structure, the utility model solves the contradiction between saving materials and maintaining pop cap pressure index, thus proving a relatively high pressure index when reducing the diameter and thickness of material incision.

Description

Anti-atmospheric pressure type metal pop-torp cover

Technical field

The utility model relates to the easy-open lid of a kind of food, beverage can, particularly a kind of can saving in material and anti-atmospheric pressure type metal pop-torp cover structure.

Background technology

Along with the raising day by day of people's living standard, market also constantly increases the demand of food and drink, well imagines that the generation of food, beverage can also increases thereupon year by year.Mental package industry competition in the tide of market economic development as food and drink is very fierce, therefore in order to economize on resources, cost-cutting adapts to the needs of market competition, research and develop a kind of saving in material and anti-atmospheric pressure type metal pop-torp cover and be not only the needs of Business survival and development, and be the certainty of market economic development.

At present, the metallic beverage can overwhelming majority on the market adopts the little opening metal of gasproof die mould easy-open lid, this easy-open lid generally is made up of lid and draw ring two parts, draw ring is riveted on the lid, but in order to make easy-open lid have the performance of air pressure resistance, the body design that lid extends to the center from circular periphery beginning becomes the structure of immersing oneself in of a concave shaped.The beverage can that uses the metal easy-open lid unstability upset can occur when regular meeting increases (such as because temperature build-up) at the jar internal gas pressure, enlarge a jar internal volume with this, prevents the excessive harm that brings of pressure.For a long time, have higher unstability upset compressive resistance in order to keep easy-open lid, the general design-calculated of the gradient of immersing oneself in is less, in 0～14 ° of gradient interval range, and A angle as shown in Figure 1.Yet along with the requirement of saving in material improves constantly, how the otch diameter at material constantly reduces, and in the time of the continuous attenuate of thickness, can keep a higher relatively withstand voltage index again, just becomes a very important problem.

Summary of the invention

The utility model provides a kind of anti-atmospheric pressure type metal pop-torp cover, its objective is that solve economical with materials and easy-open lid by a kind of new structure design keeps contradiction between the withstand voltage index, make easy-open lid reducing material cut diameter and thickness simultaneously, a higher relatively withstand voltage index still is provided.

For achieving the above object, the technical solution adopted in the utility model is: a kind of anti-atmospheric pressure type metal pop-torp cover, form by lid and draw ring two parts, draw ring is riveted on the lid, lid begins to extend to the center from the circumference outer rim and is provided with immersing oneself in of a concave shaped, the central authorities of immersing oneself in of concave shaped are round boss, its innovation is: the gradient A angle of immersing oneself in is in 15～60 ° of scopes, the B section radian area B 1 and the B2 place of boss bottom, and step C section corner local linking lid centre of gration is provided with the forging and pressing impression that flow harden is handled.

Related content in the technique scheme is explained as follows:

1, in the such scheme,, boss can be designed to two sections step boss structures, i.e. two sections stepped appearance step boss structures in order further to improve withstand voltage index.

2, in the such scheme, described gradient A angle of immersing oneself in is better in 15～45 ° of scopes.

3, the utility model principle is: the scope that when us the A angle is increased to 15 degree～60 degree in same lid type, can make the material cut reduced of easy-open lid like this, increased the degree of utilization of easy-open lid material, saved the productive costs of easy-open lid, but compressive resistance can reduce this moment.In order further to keep the A angle to increase resistance to pressure afterwards, this programme is made local flow harden impression in the C section of the bottom of lid B section and intermediate step simultaneously, i.e. the radian area B 1 of B section and B2 place in Fig. 2, and the C section is carried out the part forging and pressing, make resistance to pressure be improved, thereby realize the purpose of this programme because of local microdeformation and work hardening.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1, the utility model reduces the diameter of material cut, and then has saved cover materials under the prerequisite that guarantees withstand voltage index, and this is for producing easy-open lid in enormous quantities, and is because its economical with materials effect is very obvious, therefore significant.

2, application of the present utility model makes easy-open lid improve the degree of utilization of metallic material in actual production, thereby has directly reduced productive costs.

3, the utility model is under material unmodified prerequisite, can actv. improves the voltage endurance of easy-open lid.

Description of drawings

Accompanying drawing 1 is the utility model easy-open lid schematic partial cross-sectional view (a not punching press flow harden impression);

Accompanying drawing 2 is the utility model easy-open lid schematic partial cross-sectional view (a punching press flow harden impression);

Accompanying drawing 3 is the easy-open lid schematic partial cross-sectional view (two sections stepped appearance step boss) of another kind of structure;

Accompanying drawing 4 is stress-strain diagram (one);

Accompanying drawing 5 is stress-strain diagram (two).

In the above accompanying drawing: 1, lid; 2, boss; 3, two sections stepped appearance step boss.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: referring to illustrated in figures 1 and 2, a kind of anti-atmospheric pressure type metal pop-torp cover is made up of lid 1 and draw ring two parts.Draw ring is riveted on the lid 1, lid 1 begins to extend to the center from the circumference outer rim and is provided with immersing oneself in of a concave shaped, the central authorities of immersing oneself in of concave shaped are round boss 2, the gradient A angle of immersing oneself in is in 15～45 ° of scopes, the B section radian area B 1 and the B2 place of boss bottom, and step C section corner local linking lid centre of gration is provided with the forging and pressing impression that flow harden is handled.

Easy-open lid is to finish (two big steps all were the cool working categories) by two big step production technologies, first step production basis lid, it specifically is the input of coiled material or sheet stock, through basis lid punch ram one-shot forming, in the punch forming process, metal is to flow, and each position of moulding all should be a circular arc, be convenient to metallo-and flow, easily cause the position of rupturing and wedge angle etc. can not occur; Second step covered punching out with the basis and becomes easy-open lid, (general all only research how cover process the mechanism perfectly easily drawn back, as principles such as four one-step formings, draw ring moulding).In multistation easy-open lid punching out process, one of interpolation or change or several roads station strike out Fig. 2 to the basis lid by Fig. 1, and promptly key position produces plastic deformation, and then the part changes its stress value.(metallic material is intensity and hardness rising when the following plastic deformation of recrystallization temperature, and the phenomenon that plasticity and toughness reduce---claim flow harden.The generation reason is, metal when plastic deformation, crystal grain generation slippage, the entanglement of dislocation appears, make crystal grain elongation, fragmentation and fiberization, metal inside has produced unrelieved stress etc.)---important indicator of easy-open lid of air pressure resistance is exactly can keep to try one's best high withstand voltagely, and the unstability upset does not take place.

We can also illustrate its variation from the angle of strength of material.In strength of material, stress strain curve (stress---strain figure is seen shown in Figure 4) is the theory of classics, uses this theory, and we can effectively improve the withstand voltage unstability rollover characteristics of easy-open lid.Suppose that the unstability upset occurs in certain critical corner position in the lid, this place presses to become and has reached ε=B%, if this lid does not pass through plastic deformation.Its unstability switching process is the increase along with pressure (stress), and through the elastic deformation area, but unstability takes place when reaching B% deflection (strain), and at this moment stress is δ _bIf we carry out to a certain degree plastic deformation to this section zone, allow its recovery then, then the stress in this section zone---strain figure (seeing shown in Figure 5) becomes: when being subjected to stress once more, it can begin from residual strain ε A, making this section zone the dependent variable of B% occur equally, then is to δ from 0 between corresponding stressed zone _C, greater than original δ _b

Embodiment two: referring to Fig. 1 and shown in Figure 3, a kind of anti-atmospheric pressure type metal pop-torp cover is made up of lid 1 and draw ring two parts.Be with the difference of embodiment one: described boss is two sections step boss structures, i.e. two sections stepped appearance step boss 3.Other is identical with embodiment one, no longer is repeated in this description here.As shown in Figure 3, by being that the mode of two sections stepped appearance step boss 3 reaches distortion and work hardening with boss forming, further improve the withstand voltage index of easy-open lid.

The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the present utility model.

Claims

1, a kind of anti-atmospheric pressure type metal pop-torp cover, form by lid and draw ring two parts, draw ring is riveted on the lid, lid begins to extend to the center from the circumference outer rim and is provided with immersing oneself in of a concave shaped, the central authorities of immersing oneself in of concave shaped are round boss, it is characterized in that: the gradient A angle of immersing oneself in 15～60 ° of scopes, the B section radian area B 1 and the B2 place of boss bottom, and step C section corner local linking lid centre of gration is provided with the forging and pressing impression of flow harden processing.

2, anti-atmospheric pressure type metal pop-torp cover according to claim 1 is characterized in that: described boss is two sections step boss structures, i.e. two sections stepped appearance step boss structures.

3, anti-atmospheric pressure type metal pop-torp cover according to claim 1 is characterized in that: the gradient A angle of immersing oneself in is in 15～45 ° of scopes.