Method of punching studs with flange

 

(57) Abstract:

Usage: metal forming, namely stamping round steel rod with flange, for example, axes cars. Heat the area of deformation of the rod and make a preliminary continuous set of heated metal axial load on the rod blanks. Forging flange carried out by the closure of the punch and die. Heating on the length of the stretch deformation of the side end face of the rod, equal to 4 - 5 times the diameter of the rod, leading to a temperature of 1100 - 1200oWith the rest of the length with a gradual drop in temperature to 900 - 800oWith towards the cold section of the rod. 3 tab., 7 Il.

The invention relates to the processing of metals by pressure and can be used for punching round steel rod with flange, for example, the axes of the car.

There is a method of forming a steel rod with a flange, comprising heating the area of deformation of the rod and the stamping of the flange 4 of the transition in the split die tool on GCF [1]

The disadvantage of this method is mnogopotochnost stamping process.

There is a method of punching studs with flange includes a heating section deformation degree is maritally continuous set of heated metal axial load on the rod in the space between the punch and supportive tool in their open position, forming the site is free of deformation, the length of which does not exceed the critical, and stamping the flange of the closure plug and the supporting tool [2]

In the specified method number of positions forming reduced to one. However, in this way it is possible stamping products with a limited length of the stretch deformation of the rod to the diameter of the rod.

The aim of the invention is the expansion of technological capabilities at the expense of stamping products with increased length of the stretch deformation of the rod to the diameter of the rod.

This is achieved by a method of punching rods with a flange, comprising heating the area of deformation of the rod, its fixation from displacement in the direction perpendicular to the rod axis, in supporting the tool prior continuous set of heated metal axial load on the rod in the space between the punch and supportive tool in their open position, forming the site is free of deformation, the length of which does not exceed the critical, and stamping the flange of the closure plug and the supporting tool, heating on the length of the stretch deformation of the side end face of the rod, equal to 4-5 times the diameter of the rod, leading to tempeau to the cold section of the rod, and a set of metal leads with additional fixing the deformable end from moving in a direction perpendicular to the axis of the rod, in the punch.

In Fig. 1 shows the heating zone of the rod; Fig. 2 placement of the rod between the punch and the supporting tool before a set of metal; Fig. 3 the end of the set of metal; Fig. 4 stamping flange; Fig. 5 scheme for determining the optimal length l2homogeneous heated section; Fig. 6 scheme of determining the optimal temperature t1on uniformly heated section; Fig. 7 the scheme of determining the optimum reduction temperature t2at the site, with a gradual lowering of temperature.

Steel rod 1 of diameter d is heated, for example, induction, with one end of the length of the stretch deformation of the l1. The length of the stretch deformation of the l2by the end of the rod, equal to 4-5 times the diameter of the rod heating lead to a temperature of 1100-1200aboutAnd the rest of the length with a gradual drop in temperature to 900-800aboutWith towards the cold section of the rod. Next hot rod 1 is placed in a supportive tool 2, and the heated end of the rod 1 is placed in the recess 3 of the punch 4, grasping the rod on its laterally is ansto between punch and supportive tool in their open position, forming the site is free of deformation, the length of which is l3does not exceed the critical value. In the result set on the rod 1 is formed thickening 5. Next is the stamping of the flange 6 of the closure plug 4 and the supporting tool 2.

The specified character of the temperature distribution on the length of the stretch deformation of the rod is achieved, for example, the following methods of heating.

Heat in the inductor with a variable gap between the heated core and the coils of the inductor (the increase of the gap towards the cold section of the rod on the site, with a gradual temperature drop).

Heating inductor with different heating time for different sections of the rod (longer time of heating for areas with higher temperature, for example, due to the gradual introduction of the heated section of the rod in the inductor).

Heating inductor with pauses that provide the desired temperature gradient due to suction heat cold section of the rod.

The combination of these methods.

Below are the results of experimental work to determine the optimal parameters of the method.

The stem diameter of 30 mm

The diameter of the flange 127 mm

Assigned the free deformation of l3the diameter of the rod d 2.8 (l385 mm).

Stem material steel 40G.

Type inductor solenoid.

The high frequency power source power is 250 kW.

The current frequency of 240 Hz.

Method of obtaining promyvaemykh temperature of the heating time.

Method of obtaining promyvaemykh temperature gradients gradual introduction of the heated section of the rod into the coil.

Determination of the optimal length l2uniformly heated area. Testing was conducted at t11150oC, t2850oC.

The results of testing are shown in table. 1.

Determination of the optimal temperature t1on uniformly heated area has been carried out under the following constant parameters:

l24,5 d

t2850oC

The results are shown in table. 2.

Determining the optimum reduction temperature t2at the site, with a gradual temperature drop was provided with the following fixed parameters:

l24,5 d

t11150oC

The results of testing are shown in table. 3.

When the punching rods with a diameter of 30 mm, flange diameter of 127 mm in a manner consistent imago end in punch) could not obtain a sufficient thickness of the flange, as the ratio of the length of the stretch deformation of the rod to the diameter of the rod was not able to get more than 6. Increasing this ratio by the end of the set of metal formed folds at the expense of continuity of education thickening, and increased stress due to limited space for a set of metal (the length of the site is free of deformation l3not more than 2.5 (d), which increase due to the increase in l3led to buckling of the rod on the site is free of deformation;

By forging these steel rods offer a combination of uniformly heated area and area with a gradual drop in temperature, the presence of additional fixing the deformable end of the punch by placing the butt in the pocket, covering the rod on its side surface, the optimal parameters l24-5d, t11100-1200aboutC and t2900-800about(C) allowed to obtain a sufficient thickness of the flange and the required equal to 8, the ratio of the length of the stretch deformation, as well as the required quality forgings.

Advantages of the method are that by the end of the set of metal when the tendency of the formation of secondary thickening coming into the area Svoboda its further distribution without the formation of secondary thickening. In combination with the gradual temperature drop in the area of deformation of the rod it provides with a set of metal together, without discontinuities, thickening and subsequent receipt of the flange without folds. To compensate for the increased efforts of a set of metal associated with the lowering of temperature of the metal to the end of the set, the process is conducted at elevated values of the length of the site is free of deformation (l3more than 2.5 d), which increases the space for a set of metal and makes it more filling, and reduces the length of the heated area in the matrix, which reduces the interfering set of metal friction force between the heated portion and the inner surface of the matrix. This allows a set of metal without deformation (fragment) cold section of the rod despite the reduction temperature of the metal to the end of the set. To prevent buckling of the rod in terms of the increased length of the site is free of deformation, which is especially important in the initial set, when the set of involved parts of the rod with a high temperature, is used for additional fixation of the deformable end of the punch by placing the butt in the pocket, covering the rod on its sides the formation of l32.5.3 d.

METHOD of FORMING RODS WITH a FLANGE, comprising heating the area of deformation of the rod, its fixation from displacement in the direction perpendicular to the rod axis, in supporting the tool, advanced continuous set of heated metal axial load on the rod in the space between the punch and supportive tool in their open position, forming the site is free of deformation, the length of which does not exceed the critical, and stamping the flange of the closure plug and the supporting tool, characterized in that the heating on the length of the stretch deformation of the side end face of the rod, equal to 4-5 times the diameter of the rod, leading to a temperature of 1100 - 1200oAnd the rest of the length with a gradual lowering of temperature to 900 - 800oWith towards the cold section of the rod, and a set of metal leads with additional fixing the deformable end to move in a direction perpendicular to the axis of the rod, in the punch.

 

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