CN205463909U - Nitrogen jar bullet top formula deep -drawing mould - Google Patents

Abstract

The utility model relates to a nitrogen cylinder pop-top type deep drawing die, comprising: an upper die and a lower die connected to each other through a guide post-guide sleeve mechanism, the upper die is fixed with a guide sleeve, and the lower die is fixed with a A guide column is set, and it is characterized in that the concave-convex die set on the upper die is set opposite to the die set on the lower die, and a nitrogen cylinder spring is arranged at one end of the outer side of the lower die, and the nitrogen cylinder spring passes through the trident top plate and the The ejector is connected with the die, the trident top plate is arranged in the trident groove of the punch, and a beating plate is also arranged in the punch. The traditional rubber is replaced by the nitrogen cylinder spring, and the strong, basically constant and stable elastic force of the nitrogen cylinder spring is used to keep the blank holder force within an appropriate value range, ensuring that the material can smoothly enter the concave mold cavity, and only one pull The depth meets the requirements of the drawings, and it does not break, the circumferential surface is smooth, and there is no wrinkle. With the optimization of the mold structure, the workload of mold repair is reduced to a quarter of the original.

Description

Nitrogen cylinder pop-top deep drawing die

technical field

The utility model relates to a mold, in particular to a nitrogen cylinder pop-top type deep drawing mold.

Background technique

In the rotor with blades of the brushless DC axial flow fan, the core part is the yoke with magnetic steel installed inside and blades tightly fitted outside. Because the wall thickness of the magnetic yoke is 3.5mm, from the perspective of cost, it is an ideal choice to choose the stamping process. Due to the requirements for deep drawing performance and magnetic permeability, the yoke material is determined to be low carbon steel plate. Since the speed of the fan is 3000 rpm, the requirement for balance is very high, otherwise, when the fan is running normally, it will cause a lot of vibration. Whether this balance index can be realized depends on the precision and quality of the yoke deep drawing parts.

In order to complete the rotor with fan blades, a qualified yoke must be obtained first, which needs to be completed through two processes of blanking and deep drawing. Using the traditional structure of the rubber spring top yoke blanking and drawing composite mold will effectively improve the production efficiency. Place the cut sheet on the unloading plate on the upper end of the lower die, and close to the positioning pin. When the upper mold goes down, the outer circle of the convex and concave mold is inserted into the inner hole of the concave mold to complete the blanking process; as the upper mold continues to go down, the lower plane of the convex and concave mold presses the blanking piece and begins to draw and deform. At the same time, the top piece The upper plane of the device clings to the blanking piece and goes down under pressure until the drawing is completed.

During the production, it was found that the blanking of the mold in the initial stage was very smooth, but the subsequent deep drawing process showed fatal instability, that is, severe wrinkling often occurred. Using the traditional rubber spring top mechanism, because the material of the workpiece is too thick (up to 3.5mm), the blank holder force is seriously insufficient, which eventually leads to wrinkling, distortion of the shape of the workpiece or even being pulled apart, and because the total thickness of the rubber must exceed 200mm, so that Rubber bolt 19 is pulled off frequently. The theoretical basis of the above analysis is mainly that the change process of the blank holder force of the rubber spring top mechanism from the beginning of deep drawing to the end is from the minimum to the maximum, and from the principle of deep drawing, the change process of the blank holder force should be basically constant or from largest to smallest.

Contents of the invention

The utility model overcomes the deficiencies of the prior art, and provides a spring-top type drawing die which ensures that the nitrogen cylinder spring always maintains a state of constant pressure on the yoke blank.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a nitrogen cylinder pop-top drawing die, including: an upper die and a lower die connected to each other through a guide post-guide sleeve mechanism, the upper die The guide sleeve is fixed, and the guide post is fixedly arranged on the lower mold, and it is characterized in that the concave-convex mold set on the upper mold is set opposite to the concave mold set on the lower mold, and the outer end of the lower mold is provided with a nitrogen cylinder spring, The nitrogen cylinder spring is sequentially connected with the die through a three-prong top plate and a top piece, the three-prong top plate is arranged in the three-prong groove of the punch, and a beating plate is also arranged in the punch.

In a preferred embodiment of the present invention, the outer peripheral shape of the concave-convex mold matches the inner peripheral shape of the concave-convex mold, and the concave-convex mold can be embedded into the concave-convex mold with clearance fit.

In a preferred embodiment of the present invention, the concave-convex mold is provided with an opening facing the inner edge of the concave-convex mold.

In a preferred embodiment of the present invention, the concave mold is further provided with a stripping plate facing the upper mold side, the stripping plate is a semi-circular shape, and the semi-circular inner groove is in contact with the cavity of the concave mold. Groove edges conform to the shape.

In a preferred embodiment of the utility model, a plunger rod is arranged on the nitrogen cylinder spring, and the plunger rod connects with the three-prong ejector rod.

In a preferred embodiment of the present invention, the upper mold and the lower mold are respectively provided with an upper template and a lower template, the upper template is fixedly connected to the guide sleeve, the lower template is fixedly connected to the guide column, and the upper template is fixedly connected to the guide column. The mold is fixed on the upper template, and the lower mold is fixed on the lower template.

In a preferred embodiment of the present invention, the upper die is fixed on the upper formwork through an upper die fixing plate, and an upper backing plate is arranged between the upper die fixing plate and the upper die.

In a preferred embodiment of the present invention, the lower mold is fixed on the lower formwork through a lower mold fixing plate, and a lower backing plate is arranged between the lower mold fixing plate and the lower mold.

In a preferred embodiment of the utility model, a mold handle is arranged on one end of the outer side of the upper mold.

The utility model solves the defects in the background technology, and the utility model has the following beneficial effects:

Because the utility model replaces the traditional rubber with a nitrogen cylinder spring when setting the elastic mechanism, it overcomes ① wrinkling and deformation caused by insufficient blank holder force; It is frequently broken; ③ Only one drawing die is needed to meet the requirements of the drawings (three sets are required if the traditional structure is used).

The working cylinder of the nitrogen cylinder spring is installed at the bottom of the lower template, and its piston rod is connected with the top part through the trident top plate to ensure that the nitrogen cylinder spring always maintains a constant force on the yoke blank.

The verticality and coaxiality of the yoke are within 0.050, meeting the design requirements, which fully reflects that the nitrogen cylinder spring has a good effect on the deep drawing of deep tubes or thick-walled parts, and has great advantages in the design of drawing dies for similar products. Good promotional value.

From the above analysis, it can be known that applying the nitrogen cylinder spring to the spring top mechanism of the deep drawing die can ideally solve the technical problem of cracking or wrinkling. Using the strong, basically constant and stable elastic force of the nitrogen cylinder spring, the blank holder force is always kept within an appropriate value range, ensuring that the material can smoothly enter the concave mold cavity, and only one drawing can meet the requirements of the drawing without cracking, The circumferential surface is smooth and wrinkle-free. With the optimization of the mold structure, the workload of mold repairing is reduced to a quarter of the original one. The application of this technology has also greatly improved the drawing performance of the material, so that the originally selected cold-rolled steel plate ST14 with good elongation but expensive is replaced by the cheap hot-rolled acid steel plate SPHC, which greatly reduces Cost of production. As a mass production, the product has the advantages of controllable quality, low risk, low investment and quick return, which is an ideal structural choice for deep drawing dies.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of the preferred embodiment of the present utility model;

Fig. 2 is the sectional view of the concave-convex mold of the preferred embodiment of the present utility model;

Fig. 3 is the front view of the die of the preferred embodiment of the present utility model;

Fig. 4 is the front view of the unloading plate of the preferred embodiment of the present utility model;

Fig. 5 is the sectional view of the unloading plate of the preferred embodiment of the present utility model;

Fig. 6 is the front view of the punch of the preferred embodiment of the present utility model;

Fig. 7 is the front view of the punch of the preferred embodiment of the present utility model;

Figure 8 is a front view of the rotor with blades;

Fig. 9 is a sectional view of a rotor with fan blades;

Fig. 10 is the sectional view of magnetic steel;

In the figure: 1. upper template, 2. guide sleeve, 3. guide post, 4. mold handle, 5. upper backing plate, 6. upper mold fixing plate, 7. punching plate, 8. concave-convex mold, 9. unloading Plate, 10, die, 11, ejector, 12, trident top plate, 13, punch, 14, backing plate, 15, lower die fixing plate, 16, lower template, 17, nitrogen cylinder spring 17,18, Band blade rotor, 19, magnetic steel.

detailed description

The utility model is described in further detail now in conjunction with accompanying drawing and embodiment, and these accompanying drawings all are simplified schematic diagrams, only illustrate the basic structure of the utility model in schematic mode, so it only shows the formation relevant to the utility model.

Nitrogen cylinder, also known as nitrogen cylinder spring 17, is a new type of elastic component with high-pressure nitrogen as the working medium. It has small size, large elasticity, long stroke, stable work, precise manufacturing and long service life (one million times) , the elastic curve is gentle, and the unique advantages of no need for preloading, etc., and has the unique performance of strong initial elastic force that conventional elastic components such as metal springs, rubber and air cushions do not have, and is used to replace the work that is difficult for conventional elastic components to complete. In terms of deep drawing requirements, the nitrogen cylinder spring 17 can meet the requirement that the blank holder force change process is basically constant. Therefore, if it is applied to the deep drawing die to achieve constant spring pressure and delayed action, it is a new flexible performance. The most ideal elastic part of a generation.

As shown in Figure 1-10, a nitrogen cylinder pop-top drawing die includes: an upper mold and a lower mold connected to each other through a guide post 3-guide sleeve 2 mechanism, and the upper mold is fixed with a guide sleeve 2 , the guide post 3 is fixedly arranged on the lower die, the concave-convex die 138 provided by the upper die is set opposite to the die 10 provided by the lower die, and a nitrogen cylinder spring 17 is arranged at one end of the outer side of the lower die, and the nitrogen cylinder spring 17 is sequentially connected with the die 10 through the trident top plate 12 and the ejector 11, the trident top plate 12 is set in the trident groove of the punch 13, and the punch 13 is also provided with a beating plate 7.

The outer peripheral shape of the concave-convex mold 138 matches the inner peripheral shape of the concave-convex mold 10 , and the concave-convex mold 138 can be embedded in the concave-convex mold 10 with a clearance fit.

The die 10 is also provided with a stripping plate 9 on the side facing the upper die, the stripping plate 9 is semi-circular, and the inner groove of the semi-circular shape matches the shape of the groove edge of the die 10 .

A plunger rod is arranged on the nitrogen cylinder spring 17, and the plunger rod connects with the trident ejector rod, and a die handle 4 is arranged at the outer end of the upper die.

The upper die and the lower die are respectively provided with an upper template 1 and a lower template 16, the upper template 1 is fixedly connected to the guide sleeve 2, the lower template 16 is fixedly connected to the guide pillar 3, and the upper die is fixed on the upper template 1, The lower mold is fixed on the lower template 16, the upper mold is fixed on the upper template 1 by the upper mold fixing plate 6, the upper backing plate 5 is arranged between the upper mold fixing plate 6 and the upper mold, and the lower mold passes the lower mold fixing plate 15 It is fixed on the lower template 16, and a lower backing plate 14 is arranged between the lower mold fixing plate 15 and the lower mold.

The utility model uses the nitrogen cylinder spring 17 as a blanking and drawing compound mold for the top part, and this process can overcome the problems of wrinkling and twisting deformation of the stretched parts due to the excessive thickness of the workpiece material. During work, the strip is pushed along the fixed discharge plate 9 of the lower die, and when the 10 holes of the blanking die are covered, stamping can be carried out. When the blanking is completed, it enters the deep drawing stage, that is, with the downward pressure of the convex and concave dies 10, the ejector 11 is also pressed down with the drawn material, and the ejector 11 pushes the trident top plate 12, and finally the trident top plate 12 pushes the nitrogen. The plunger rod of the cylinder goes down, and under the top pressure of the nitrogen cylinder, the blank holder force can reach 1.6 tons (ie 16000N) in the initial state, which is greater than the required 1.4 tons (see calculation for details). When the upper mold returns, the waste is unloaded by the fixed unloading plate 9, and the yoke drawing part stays in the punch and die 10 holes and is laid down by the beating plate 7.

(1) Calculation of drawing force:

10 steel σb=400MPa, the expanded dimension of the yoke deep drawing part is calculated as D=154mm,

Then the drawing coefficient m=d/D=92.5/154=0.6,

The drawing force coefficient K1=0.86 is checked from P189 Table 5-5 of "Die Design Manual",

Then the drawing force P= K1πdtσb=0.86π×92.5×3.5×400=299744.4N=30 tons.

(2) Calculation of pressing force:

Pressing area F=π(1542-92.52)/4=11900mm2,

The pressing force per unit area is p=1.2MPa,

Then, the pressing force Py=Fp=11900×1.2=14280.5N=1.4 tons meets the pressing force requirement at the beginning of the stroke, so select the pressure curve shown in Figure 5 that satisfies the initial elastic pressure of 16000N, that is, determine the selection "KALLER LCF 3000-064 Nitrogen Cylinder Spring 17" and need to fill the nitrogen cylinder with nitrogen pressure.

The above is inspired by the ideal embodiment of the utility model, and through the above description, relevant personnel can make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (9)

1. a nitrogen cylinder bullet top formula cupping tool, including: it is mutually linked upper die and lower die together by guide pillar-guide sleeve mechanism, guide pin bushing is fixed in described upper mold, it is fixedly installed guide pillar in described lower mold, it is characterized in that, the die that the concave-convex mold that described upper mold is arranged and described lower mold are arranged is oppositely arranged, described lower mold lateral ends is provided with nitrogen cylinder spring, described nitrogen cylinder spring passes sequentially through trident top board and ejector and is connected with described die, described trident top board is arranged in the trident groove of punch, is additionally provided with and re-packs in described punch.

Nitrogen cylinder bullet top the most according to claim 1 formula cupping tool, it is characterised in that: described concave-convex mold peripheral shape and described die inner circumferential shape are coincide, and described concave-convex mold can be in the described die of embedding of matched in clearance.

Nitrogen cylinder bullet top the most according to claim 1 and 2 formula cupping tool, it is characterised in that: it is provided with the opening inner edge towards described die on described concave-convex mold.

Nitrogen cylinder bullet top the most according to claim 1 formula cupping tool, it is characterised in that: described die is additionally provided with stripper towards described upper mold side, and described stripper is semi-circular, and described semi-circular inboard groove coincide with the groove edge shape of described die.

Nitrogen cylinder bullet top the most according to claim 1 formula cupping tool, it is characterised in that: arranging plunger rod on described nitrogen cylinder spring, described plunger rod is connected described trident push rod.

Nitrogen cylinder bullet top the most according to claim 1 formula cupping tool, it is characterized in that: described upper mold and described lower mold are respectively provided with cope match-plate pattern and lower bolster, described cope match-plate pattern is fixing connects described guide pin bushing, described lower bolster is fixing connects guide pillar, described upper mold is fixed on cope match-plate pattern, and described lower mold is fixed on lower bolster.

Nitrogen cylinder bullet top the most according to claim 6 formula cupping tool, it is characterised in that: described upper mold is fixed on cope match-plate pattern by upper mould fixed plate, is provided with upper padding plate between described upper mould fixed plate and described upper mold.

Nitrogen cylinder bullet top the most according to claim 6 formula cupping tool, it is characterised in that: described lower mold is fixed on lower bolster by lower mold fixed plate, is provided with lower bolster between described lower mold fixed plate and described lower mold.

Nitrogen cylinder bullet top the most according to claim 1 formula cupping tool, it is characterised in that: it is provided with die shank on the one end outside described upper mold.