CN115502270A - A multi-profile rotary wheel and its dual-combination composite spinning forming method - Google Patents

Abstract

The invention discloses a multi-profile spinning roller and a double-recombination composite spinning forming method thereof; the multi-profile rotating wheel adopted in the forming process comprises an arc-shaped profile, a cylindrical profile and a conical profile; the arc-shaped molded surface is used for drawing and spinning; the cylindrical molded surface is used for die attaching and shaping; the tapered profile is used for flow spinning. The invention adopts the combination of a single combined spinning wheel with different molded surface combinations and the combination of a plurality of flow spinning wheels, which have the functions of drawing, shaping and flow spinning, to carry out single-pass or multi-pass composite spinning forming on a sheet blank, thereby directly obtaining the thin-wall cup-shaped part. The method can improve the processing efficiency and the product forming precision.

Description

A multi-profile rotary wheel and its dual-combination composite spinning forming method

technical field

The invention relates to a spinning process for thin-walled deep cup-shaped parts, in particular to a multi-profile spinning wheel and a double-combined composite spinning forming method thereof.

Background technique

The blanks used for the spinning of thin-walled deep cup-shaped parts can be divided into turning blanks and sheet blanks. The former still needs to be turned with bar stock. First, thick-walled shallow cup-shaped turning blanks are obtained, and then multiple step rollers are used for flow. Spinning forming, and finally obtain a thin-walled deep cup-shaped part, will also generate material waste when turning the blank, and will destroy the internal fiber structure of the material and reduce the mechanical properties of the material. The latter uses sheet metal as the spinning blank, and generally one or more arc-shaped surface rollers are used for deep-drawing and spinning to obtain thick-walled shallow cup-shaped parts, and then the spinning machine tool or tooling is replaced. The step roller is used for flow spinning forming, and finally a thin-walled deep cup-shaped part is obtained.

There are also at least three rotary wheels that combine the deep-drawing spinning surface and the flowing spinning surface to spin the sheet blank into a cup-shaped part under the condition of current assistance, but due to the need for current assistance, the complexity of the tooling is increased. and processing costs, and it is difficult to coordinate the contact between the profiles of multiple rotary wheels and the workpiece, which increases the difficulty of process adjustment. At the same time, due to the rebound effect after deep drawing and spinning, there will inevitably be gaps of inconsistent sizes between the workpiece and the mandrel, which will bring certain adverse effects to the subsequent flow spinning.

Contents of the invention

The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a multi-profile rotary wheel and its double-combined composite spinning forming method.

The present invention realizes through following technical scheme:

A multi-profile rotary wheel, the profile of the multi-profile rotary wheel sequentially includes an arc-shaped profile I, a cylindrical profile II and a conical profile III; wherein,

The arc-shaped profile I is used for drawing and spinning;

The cylindrical profile II is used for molding shaping;

The conical profile III is used for flow spinning.

The outer diameter of the arc shaped surface I<the outer diameter of the cylindrical shaped surface II, and the outer diameter of the cylindrical shaped surface II<the outer diameter of the tapered shaped surface III.

The difference between the outer diameter of the cylindrical profile II and the outer diameter of the conical profile III is 0.8 to 1.2 times the final thinning of the blank.

The axial length of the cylindrical profile II is 1 to 2 times the initial thickness of the blank.

A method for composite spinning of double combination rollers; in the forming process, the multi-profile rollers are used as the first-level combination rollers; the first-level combination rollers and multiple flow rollers are used together as The second level combined rotary wheel;

Specifically include the following steps:

Step 1, the first-level combined rotary wheel performs deep-drawing spinning, molding shaping and flow spinning on the blank, so as to complete the first-level composite spinning;

Step 2: Combine the first-level combination roller and multiple flow rollers together as the second-level combination roller, and jointly complete the second-level composite spinning; and then complete the double composite spinning composite spinning.

In the second-level composite spinning forming process, the number of the first-level combination rollers is one, and the number of flow rollers is two;

Among them, a first-level combination roller and two flow rollers are evenly distributed at 120° around the center line of the spinning mandrel.

The first-level composite spinning forming and the second-level composite spinning forming process include single-pass deep-drawing spinning, single-pass flow spinning, single-pass deep-drawing spinning, and multi-pass flow spinning .

The process of the first-level composite spinning forming and the second-level composite spinning forming includes multi-roller staggered-pitch spinning and multi-roller equidistant spinning.

Compared with the prior art, the present invention has the following advantages and effects:

In the spinning forming process of thin-walled deep cup-shaped parts, the present invention uses multi-profile rollers as the first-level combination rollers; the first-level combination rollers and multiple flow rollers are jointly used as the second-level combination Spinning wheel; the specific steps are: Step 1, the first level combined spinning wheel performs deep-drawing spinning forming, molding shaping and flow spinning forming on the blank, so as to complete the first level composite spinning forming; Step 2, the first level The layer combination roller is combined with a plurality of flow rollers, which together serve as the second layer combination roller, and jointly complete the second layer composite spinning; and then complete the double combination roller composite spinning forming.

It can be known from the above-mentioned technical features that the present invention (1) can use the sheet metal blank to be directly spun into a thin-walled deep cup-shaped part, which improves the mechanical properties of the part and reduces the processing cost of the part. (2). The flexibility of the spinning process design is improved. It can not only complete the single-pass single-pass or multi-pass deep drawing spinning, but also complete the multi-rotary single-pass or multi-pass flow spinning. Different combinations of drawing spinning and flow spinning pass times can be completed. And it can be used for both equal-distance spinning and staggered-pitch spinning. At the same time, when adjusting the staggered pitch of the rollers, there is no need to worry about the influence of the combined profile of the first roller. (3). It is beneficial to improve the forming quality of spinning parts and obtain high-precision spinning parts.

Description of drawings

Fig. 1 is a schematic diagram of a thin-walled deep cup;

Fig. 2 is a schematic diagram of a multi-profile rotary wheel of the present invention;

Fig. 3 is a schematic diagram of the multi-profile rotary wheel shown in Fig. 2 of the present invention, which is applied to the composite spinning process of the double combination rotary wheel; wherein numbers 1-3 are three multi-profile rotary wheels arranged at staggered distances;

Figure 4 is an example of the application of the process of the present invention, in which is a schematic diagram of a thin-walled cup-shaped spinning blank for flexspline gearing.

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

Example 1

In the process of the present invention shown in Fig. 1, the involved deep cup-shaped thin-walled part process example;

The material is 08 steel, the outer diameter of the part is d=80mm, the wall thickness t ₁ =0.6mm, the height h=110mm, and the bottom thickness t ₀ =3.0mm, which is used for punching and fixing the part. Carry out design and forming by spinning process of the present invention:

(1). Check the manual to know the trimming allowance: δ=5mm, so the material volume: V≈π(h+δ－t ₀ )dt ₁ +0.25πd ² t ₀ ＝31953mm ³ ; the initial diameter of the blank: D ₀ =2[V/(πt ₀ )] ^1/2 ≈116mm. Drawing coefficient: 80/116≈0.69, which is greater than the limit drawing coefficient of one-time drawing forming, 0.46~0.6. It can be formed by one-time drawing, and it can also be formed by one-time drawing and spinning.

(2). Figure 2 shows the design of 1# (that is, the multi-surface rotary wheel of the first-level combined rotary wheel), and its profile structure is: the arc-shaped profile I is used for drawing and spinning; Shaped surface II is used for molding shaping; tapered surface III is used for flow spinning. The length of the cylindrical part of the cylindrical profile II is 1.0 to 2.0 times the initial thickness of the blank. According to the initial thickness of the blank of 3.0mm and the low strength of 08 steel, take 4.0mm from 3.0 to 6.0mm, and then according to the cylindrical shape The difference between the outer diameter of the cylindrical part of the surface II and the outer diameter of the tapered surface III is 0.8 to 1.2 times the total thinning of the blank, and the total thinning of the blank is 2.4mm. In the case of low strength of 08 steel, it is 1.9mm 2.4mm is taken from ~2.9mm (that is, the radius difference is 1.2mm).

(3) Spinning forming: three-wheel staggered pitch spinning is adopted, except for the 1# roller, the other two rollers are common conical surface flow forming rollers. The three rotary wheels surround the axis of the mandrel at intervals of 120°. In the first pass, a cup-shaped piece with a wall thickness of 1.3 mm is obtained through composite spinning (the schematic diagram of the composite spinning process is shown in Figure 3). Here, the composite spinning During the pressing process, the arc-shaped part of the 1# rotary wheel first contacts the blank for drawing and spinning, and then the three rotary wheels start to flow and spin forming one after another. In the second pass, the three rollers are formed by single flow spinning to reduce the wall thickness from 1.3mm to 0.6mm. Finally, cut off the mouth allowance to get the parts shown in Figure 1.

Example 2

Fig. 4 shows the example of another kind of spin blanking process for flexible spline processing involved in the present invention;

The material is 30CrMnSiA steel, the inner diameter of the part is d=55mm, the thickness of the bottom is 2.8mm, the wall thicknesses are 0.4mm and 0.7mm respectively, and the height of the two sections of the wall is 10mm.

The steps of adopting the technology spinning forming of the present invention are as follows:

A sheet with a thickness of 2.8mm and a diameter of 90mm is used as the blank for spinning, and the same three rollers as in Example 1 are used. However, since there is a step in the middle of the part, staggered spinning cannot be performed, so equidistant spinning is adopted. That is to say, the tapered surface parts of the three rotary wheels are in the same position in the radial direction and axial direction of the mandrel. The first pass is formed into a cup-shaped piece with an equal wall thickness of 1.1mm by the composite spinning process in the first pass. Then use a single flow spinning to form different thicknesses of the wall, that is, start from the bottom, and reduce the wall thickness from 1.1mm to 0.4mm. The external movement is 0.3mm, and the wall thickness of the remaining part is reduced from 1.1mm to 0.7mm, so as to complete the one-time spinning forming of two sections of wall thickness.

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (8)

1. A many profiles revolves wheel which characterized in that:

the molded surface of the multi-molded surface rotating wheel sequentially comprises an arc molded surface I, a cylindrical molded surface II and a conical molded surface III; wherein,

the arc-shaped molded surface I is used for drawing and spinning;

the cylindrical molded surface II is used for die attaching and shaping;

the conical profile III is used for flow spinning.

2. The multi-profile spinning wheel of claim 1, wherein:

the outer diameter of the arc-shaped profile I is smaller than that of the cylindrical profile II, and the outer diameter of the cylindrical profile II is smaller than that of the conical profile III.

3. The multi-profile spinning wheel of claim 3, wherein:

the difference between the outer diameter of the cylindrical profile II and the outer diameter of the conical profile III is 0.8-1.2 times of the final thinning amount of the blank.

4. The multi-profile spinning wheel of claim 4, wherein:

the axial length of the cylindrical profile II is 1-2 times of the initial thickness of the blank.

5. A composite spinning forming method of a double-combined spinning roller is characterized in that the multi-profile spinning roller of any one of claims 1 to 4 is used as a first-level combined spinning roller; taking the first-level combined rotary wheel and the plurality of flow rotary wheels as a second-level combined rotary wheel;

the method specifically comprises the following steps:

step one, carrying out drawing spinning forming, die-attaching shaping and flow spinning forming on a blank by a first-level combined spinning wheel to finish first-level composite spinning forming;

combining the first-level combined spinning wheel with a plurality of flow spinning wheels to be used as a second-level combined spinning wheel together, and finishing second-level composite spinning forming together; thereby completing the composite spinning forming of the double-combined spinning wheel.

6. The composite spinning forming method of the double-combination spinning roller according to claim 5, characterized in that:

in the second-level composite spinning forming process, the number of the first-level combined spinning wheels is one, and the number of the flowing spinning wheels is two;

wherein, a first-level combined spinning wheel and two flow spinning wheels are uniformly distributed around the central line of a core mould of a spinning machine at 120 degrees.

7. The composite spinning forming method of the double-combined spinning wheel according to claim 6, characterized in that:

the first-level composite spinning forming process and the second-level composite spinning forming process comprise single-pass deep-drawing spinning, single-pass flow spinning, single-pass deep-drawing spinning and multi-pass flow spinning.

8. The composite spinning forming method of the double-combined spinning wheel according to claim 6, characterized in that:

and in the processes of the first-level composite spinning forming and the second-level composite spinning forming, the multi-spinning-wheel staggered spinning and the multi-spinning-wheel equidistant spinning are included.

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