CN106424502A - Upsetting method and device for sheet-metal part with cylinder wall being thicker than flange - Google Patents

Abstract

The invention belongs to a stamping production method and device for sheet metal, in particular to a production method and device for a stamping part with a flange whose wall thickness is greater than that of the flange. It includes a mandrel, a positioning ring, an upsetting ring, a floating die, a mandrel, a lower formwork and an upper formwork; wherein, the upset ring and the upper formwork are fixed together, the mandrel and the positioning ring are installed on the lower formwork, and the floating concave The mold is hollow cylindrical and is located between the lower template and the upper template, and the cylinder wall of the floating die is located between the positioning ring and the upset ring. Its advantages are that its material utilization rate is greatly improved, the machining hours are significantly reduced, and it has significant economic benefits; after the cylinder wall part is upset, its mechanical properties are improved to varying degrees due to the work hardening effect, which can make the load bearing of the workpiece Features are improved.

Description

A method and device for upsetting and extruding a plate product with a wall thickness greater than that of a flange

technical field

The invention belongs to a stamping production method and device for sheet metal, in particular to a production method and device for a stamping part with a flange whose wall thickness is greater than that of the flange.

Background technique

Stamping parts are a type of product that is widely used in equipment manufacturing, instrumentation, vehicle engineering and daily life. The production of such products is usually realized with the help of corresponding molds or tooling. According to the current technical level, using the deep drawing process, it is possible to produce cylindrical parts with the same or nearly equal thickness of the flange and the wall of the cylinder, and using the thinning and deep drawing technology to produce cylindrical parts with a wall thickness smaller than that of the flange.

In the field of actual manufacturing engineering, it is common to encounter stamped products whose cylinder wall thickness is required to be greater than that of the flange. Such products cannot be directly produced using existing stamping technology. The most common method is to directly use machining to meet the production requirements, or first obtain an intermediate product that meets the wall thickness requirements by means of the traditional deep drawing process, and then reduce the flange thickness by machining. The above two methods all have large material consumption, large machining workload and low production efficiency.

Contents of the invention

The object of the present invention is to provide a method and device for upsetting and extruding a metal plate whose wall thickness is greater than that of the flange, which can solve the technical status quo in the production of stamping products with different thicknesses.

The present invention is achieved in this way, an upsetting device for sheet metal products with a cylinder wall thickness greater than the thickness of the flange, which includes a mandrel, a positioning ring, an upsetting ring, a floating die, a push rod, a lower template and an upper template; , the upsetting ring and the upper template are fixed together, the core mold and the positioning ring are installed on the lower template, the floating die is hollow cylindrical and is located between the lower template and the upper template, and the cylinder wall of the floating die is located between the positioning ring and the upsetting ring. between thick rings.

A method for upsetting and extruding a plate product whose wall thickness is greater than that of a flange comprises the following steps,

1) Firstly, the metal sheet is made into a tubular part preform with a flange of equal wall thickness or approximately equal wall thickness through a conventional drawing and punching process or a drawing and punching flanging process;

2) Put the preform of equal thickness into the mandrel rigidly connected with the lower formwork, and the upper formwork goes down, driving the floating die to press the flange of the preform and gradually reset the push rod. The mold acts as a guide;

3) The upper formwork continues to descend, and the upsetting ring fixed to it is guided by the mandrel to upset the wall of the preform until it fills the annular area between the mandrel and the floating die;

4) The upper die is lifted, and the upsetting ring and the floating die move up accordingly, and the ejector rod ejects the workpiece with a thick upsetting cylinder wall from the mandrel.

The advantages of the present invention are: firstly, compared with traditional mechanical processing methods, using the method and tooling provided by the present invention to make sheet metal parts with a wall thickness greater than the thickness of the flange, the material utilization rate is greatly improved, and the machining hours are significantly improved. reduction, which has significant economic benefits; secondly, after the cylinder wall part is upset, its mechanical properties are improved to varying degrees due to the work hardening effect, which can improve the load-bearing characteristics of the workpiece; thirdly, the technology provided by the present invention And the device, not only can be used in the manufacture of revolving body parts, but also can be used in the manufacture of non-revolving body section parts.

Description of drawings

Fig. 1 is a schematic diagram of an upsetting device for sheet metal products whose wall thickness is greater than that of the flange;

Fig. 2 is a schematic diagram of a prefabricated blank with the same thickness as the flange and the cylinder wall;

Fig. 3 is a part diagram of the flange;

Fig. 4 is the flange plate prefabricated workpiece drawing of equal thickness;

Fig. 5 is a part diagram of the end cover;

Figure 6 is the end cover preform;

Figure 7 is the intermediate transition piece of the end cover

In the figure, 1 mandrel, 2 positioning rings, 3 upsetting rings, 4 floating dies, 5 workpieces, 6 ejector pins, 7 lower templates, and 8 upper templates.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

The technical principle of the present invention is to adopt a combined process of drawing, punching and upsetting to complete the production of cylindrical stamping products whose wall thickness is greater than that of the flange. Drawing and punching make the metal flat plate into a cylindrical preform of equal wall thickness or approximately equal wall thickness, and upsetting increases the wall thickness of the preform to the design requirement (greater than the thickness of the flange).

An upsetting device for a plate product whose cylinder wall thickness is greater than that of a flange includes a mandrel 1 , a positioning ring 2 , an upsetting ring 3 , a floating die 4 , a push rod 6 , a lower template 7 and an upper template 8 . Its connection relationship is shown in Figure 1. The upsetting ring 3 and the upper template 8 are fixed together, the core mold 1 and the positioning ring 2 are installed on the lower template 7, the floating die 4 is hollow cylindrical and is located between the lower template 7 and the upper template, and the floating die 4 The cylinder wall is located between the positioning ring 2 and the upset ring 3 .

Through the above-mentioned device, the production of cylindrical stamping products whose wall thickness is greater than the thickness of the flange can be realized, and the specific steps are as follows:

1) Firstly, the metal sheet is made into a cylindrical part preform with a flange of equal wall thickness or approximately equal wall thickness through a conventional drawing and punching process or a drawing and punching flanging process, as shown in Figure 2;

2) Put the preform of equal thickness into the mandrel rigidly connected with the lower formwork, and the upper formwork goes down, driving the floating die to press the flange of the preform and gradually reset the push rod. The mold acts as a guide;

3) The upper formwork continues to descend, and the upsetting ring fixed to it is guided by the mandrel to upset the wall of the preform until it fills the annular area between the mandrel and the floating die;

4) The upper die is lifted, and the upsetting ring and the floating die move up accordingly, and the ejector rod ejects the workpiece with a thick upsetting cylinder wall from the mandrel.

Utilizing the technology and device provided by the invention, one upsetting can increase the wall thickness up to 100%. If the thickness of the cylinder wall required by the workpiece is greater than this value, the above-mentioned upsetting operation needs to be repeated once, and the upsetting ring and the floating die need to be replaced for this purpose. If necessary, an annealing process can be arranged between repeated upsetting.

Example 1

The shape and size of a flange is shown in Figure 3, and the material is 5A06 aluminum alloy.

The first step, blank

The feature of this part is that the wall thickness of the barrel is twice the thickness of the flange. According to the condition of constant volume, the aluminum alloy metal sheet is made into the preform of equal-thickness tubular part as shown in the figure by using the ordinary drawing and punching composite process.

The second step upsetting

Because the thickness of the cylinder wall of the final part is twice the thickness of the flange, the technical method and tooling structure disclosed by the present invention can be completed through one upsetting.

Example 2

The structural dimensions of a certain type of end cover are shown in Figure 5, and the material is 2A12 aluminum alloy.

The first step, blank

This part is characterized by a barrel wall thickness 2.5 times the flange thickness. According to the condition of constant volume, the aluminum alloy metal sheet is made into the preform of the tubular member of equal thickness sheet as shown in the figure by using the common drawing and punching composite process.

The second step is the first upsetting

Because the thickness of the final part cylinder wall is 2.5 times of the flange thickness, the technical method and tooling structure disclosed by the present invention can be completed through upsetting twice. For the first time, the preform shown in Fig. 5 was upset into the intermediate transition piece shown in Fig. 7, and the thickness of the tube wall was 3.8 mm.

The third step, the second upsetting

Upset the intermediate transition piece shown in Figure 7 to the end cap part shown in Figure 5.

Claims (2)

1. a kind of wall thickness be more than flange thickness sheet product upsetting squeeze device it is characterised in that：It includes core (1), determines Position circle (2), jumping-up ring (3), floating cavity die (4), push rod (6), lower template (7) and cope match-plate pattern (8)；Wherein, jumping-up ring (3) with upper Template (8) is fixed together, and core (1) and centring ring (2) are arranged in lower template (7), and floating cavity die (4) is for hollow tubular simultaneously And it is located at lower template (7) and cope match-plate pattern between, the barrel of floating cavity die (4) is located between centring ring (2) and jumping-up ring (3).

2. a kind of wall thickness be more than flange thickness sheet product upsetting-extruding method it is characterised in that：It comprises the steps,

1) first pass through routine drawing punching technology or drawing piercing and flanging technique by sheet metal make with flange etc. Wall thickness or the cylindrical member prefabricated blank of the wall thickness such as approximate；

2) prefabricated blank of equal thickness is inserted on the rigidly connected core with lower template, cope match-plate pattern is descending, drives floating cavity die pressure The flange of tight prefabricated blank simultaneously makes push rod gradually reset, and centring ring play the guiding role to floating cavity die in the process；

3) cope match-plate pattern continues traveling downwardly, and jumping-up ring affixed therewith, with core for guiding, carries out jumping-up to the barrel of prefabricated blank, until Full of the annular region between core and floating cavity die；

4) upper mould lifts, and jumping-up ring is up therewith with floating cavity die, and the thick workpiece of barrel jumping-up is ejected from core by knock-pin.