CN217990443U - Hot extrusion molding and material returning device of horizontal continuous casting crystallizer with steps - Google Patents

Abstract

The utility model discloses a hot extrusion molding and material returning device of a horizontal continuous casting crystallizer with steps, which comprises a hot extrusion upper die and a connected hot extrusion core rod, wherein the lower part of the hot extrusion core rod is provided with a molding die which is arranged at the same center and is arranged on the hot extrusion lower die, and a backing plate and an ejector rod arranged on the backing plate are arranged in the molding die and pass through the hot extrusion lower die; the hot extrusion core rod is a taper rod, and the hot extrusion core rod is provided with a material returning compression mold with a circular bead; the forming die is provided with an inner cavity with variable diameters at the upper section and the lower section, the upper section of the forming die is an inner cavity for placing blanks and being capable of being embedded into the material returning compression die, the lower section of the forming die is an inner cavity for an extrusion forming copper pipe, and a flanging step transition inclined chamfer angle of the forming copper pipe is arranged between the variable diameters at the upper section and the lower section of the forming die. The copper pipe is formed by the blank under the action of the material returning and pressing die, so that the copper pipe is prevented from being locked on the hot extrusion core rod during return stroke. Effectively solve the step "meat deficiency" problem appearing in traditional turn-ups step die mould.

Description

Hot extrusion molding and material returning device of horizontal continuous casting crystallizer with steps

Technical Field

The utility model relates to a take step horizontal continuous casting crystallizer hot extrusion shaping and material returned device.

Background

Horizontal continuous casting crystallizer, the material is mostly chromium bronze or chromium zirconium copper, and traditional extrusion mode is for extruding the copper pipe earlier, then heats the turn-ups to its copper pipe and presses the step, and processing technology is promptly: extrusion forming of a copper pipe (thin-walled pipe), sawing of an end face, heating and flanging and fine machining. The flanging device for processing the thin-wall copper pipe comprises a hot extrusion upper die, a hot extrusion core rod, a material returning pressure ring matched with the hot extrusion upper die, a forming die, a backing plate, an ejector rod and a hot extrusion lower die, wherein the hot extrusion forming device is formed by the hot extrusion upper die, the hot extrusion core rod and the material returning pressure ring. In the hot extrusion molding device, a hot extrusion upper die is connected with a hot extrusion core rod through threads, a material returning pressure ring is movably matched with the hot extrusion core rod through the taper of an inner cavity, a molding die is fixedly connected with a hot extrusion lower die, and a base plate is placed at the bottom of the molding die. The forming die is an inner cavity with the same diameter, the top of the inner cavity is provided with a step flanging counter bore with the same wall thickness as the copper pipe, and a transition arc is arranged between the step flanging counter bore and the inner cavity. When the thin-wall copper pipe is heated to the temperature, the thin-wall copper pipe is placed into a forming die, a material returning pressing ring is placed at the upper end of the thin-wall copper pipe located at the step flanging counter bore position, at the moment, a hot extrusion upper die moves downwards under the action of an oil press, a hot extrusion core rod synchronously moves downwards, the end face of the hot extrusion core rod acts on the material returning pressing ring under the action of pressure, the thin-wall copper pipe is subjected to compression flanging through the material returning pressing ring, the downward movement is stopped when the position is limited, and the return stroke is carried out. At the moment, under the action of the hydraulic cylinder, the ejector rod moves upwards to act on the backing plate to eject the finally formed copper pipe out of the die cavity. In the extrusion forming process, the used blank is a thin-wall copper pipe blank, the outer diameter is 138mm, the wall thickness is 13mm, the blank is flanged and formed by copper pipe compression, the compression forming process belongs to an upsetting process, metal flows in a free state, and the flanged step shape is obtained due to the size constraint of a die. However, in the process of pressing, airflow is blocked at the peripheral edge of the die and an inner hole, so that the steps of the flanging of the outer circle of the steps of the formed copper tube are not easy to fill, and irregular meat deficiency can occur at the periphery of the inner hole locally. Affecting the processing quality of the product. The yield of this processing mode is 50% according to production lot tracking.

Disclosure of Invention

In view of the above-mentioned current situation, the utility model provides a take step horizontal continuous casting crystallizer hot extrusion shaping and material returned device, design through the device, make product technological parameter and extrusion method change, the blank that the device used is the thick wall copper pipe, the external diameter can satisfy step machining dimension, the blank is through just extrusion, product technology changes the mould intracavity by original turn-ups technology and is just extrudeing, the process route changes "thick" into "thick attenuate" former external diameter 138mm of blank by original "thin, wall thickness 13mm, improve back external diameter 168mm, wall thickness 26mm, so, the step size of product can guarantee completely, make the product percent of pass reach more than 99%, machining efficiency promotes greatly.

The utility model adopts the technical proposal that the hot extrusion molding and material returning device of the horizontal continuous casting crystallizer with steps comprises a hot extrusion upper die and a connected hot extrusion core rod, a molding die which is provided with the same center and is arranged on a hot extrusion lower die is arranged at the lower part of the corresponding hot extrusion core rod, and a backing plate and an ejector rod arranged on the backing plate are arranged in the molding die and pass through the hot extrusion lower die; the hot extrusion core rod is a taper rod, and the hot extrusion core rod is provided with a material returning compression mold with a circular bead; the forming die is provided with an inner cavity with variable diameters at the upper section and the lower section, the two third positions of the upper section of the forming die are inner cavities for placing blanks and being capable of being embedded into the material returning compression die, the remaining one third positions and the lower section of the forming die are steps and shapes of the extrusion forming copper pipe, and transition inclined chamfers of the flanging steps of the forming copper pipe are arranged between the variable diameters of the upper section and the lower section of the forming die.

In the novel structure, the inner hole of the material returning compression mould is a taper hole, the taper hole is equal to the taper of the outer diameter of the hot extrusion core rod, and the two parts are fixedly connected into a whole through the tapers of the two parts.

In the novel structure, the depth of the inner cavity of the upper section of the forming die is smaller than the axial length of the material returning compression die. Therefore, the extrusion limit of the material returning compression mould is convenient to set, and the extrusion is ensured to be in place.

In the novel structure, an extrusion flanging step thickness gap is arranged between the end part of the material returning compression mould and the reducing transition end of the upper section and the lower section of the embedded forming mould.

In the novel copper tube forming device, the formed copper tube and the step are formed in one step through blank hot extrusion.

The beneficial effects of the utility model are that: through a take step horizontal continuous casting crystallizer thermal extrusion shaping and material returned device, change the process route from original "thin thick" to "thick thin" blank original external diameter 138mm, wall thickness 13mm, external diameter 168mm after improving, wall thickness 26mm, so, optimize to the positive extrusion in the die cavity by the turn-ups technology, the blank is in whole extrusion process, through material returned die mould this key component, the step size of product can guarantee completely. And under the action of a press, the material returning and molding die is used for extruding the blank to realize the molding of the product. During return stroke, the material returning compression mold is used as a material returning device, so that the copper pipe is prevented from being locked on the hot extrusion core rod, and the hot extrusion core rod returns smoothly. When the copper pipe is ejected out of the die, the material returning compression mold is separated from the copper pipe, and continuous production can be carried out. Compared with the traditional flanging and profiling process, the blank size of the optimized forward extrusion process is the flanging size, so that the problem of meat shortage of step parts during flanging and forming is solved on site, alignment is extremely convenient in the subsequent processing process, the forming qualification rate of the copper pipe is effectively improved by more than 99%, and the processing efficiency is greatly improved.

Drawings

FIG. 1 is a structural view of the present invention;

FIG. 2 is an extruded front elevational view of the copper tubing blank of FIG. 1;

FIG. 3 is a view of the copper tube blank of FIG. 2 illustrating the formation of an extruded copper tube;

fig. 4 is a view of the extruded copper tubing of fig. 2.

In the figure: 1 hot extrusion upper die, 2 hot extrusion core bar, 3 material returning compression mould, 4 forming die, 5 backing plate, 6 hot extrusion lower die, 7 ejector rod, 8 copper pipe blank, 9 copper pipe and 10 flanging step.

Detailed Description

The present invention will be further explained with reference to the embodiments of the drawings.

The hot extrusion forming and material returning device of the horizontal continuous casting crystallizer with the step shown in fig. 1 comprises a hot extrusion upper die 1, wherein the hot extrusion upper die 1 is connected with an external oil press (not shown), and the hot extrusion upper die 1 can move up and down under the action of the oil press. The hot extrusion upper die 1 is connected with a hot extrusion core rod 2, a forming die 4 with the same center is arranged at the lower part corresponding to the hot extrusion core rod 2, and the forming die 4 is arranged on the hot extrusion lower die 6 and is locked and fixed through a copper pipe bolt (not marked in the figure). The bottom of the inner cavity of the forming die 4 is provided with a backing plate 5 and an ejection rod 7 which is integrally connected with the backing plate, and the ejection rod 7 partially penetrates through a through hole of the hot extrusion lower die 6 and is led out, so that the leading-out end of the ejection rod 7 is connected with an external hydraulic cylinder (not shown in the figure). Under the action of the hydraulic cylinder, the ejector rod 7 and the base plate 5 move up and down. In this embodiment, the hot extrusion core rod 2 is a taper rod, and the hot extrusion core rod 2 is provided with a material returning compression mold 3 with a shoulder; the forming die 4 is provided with an inner cavity with variable diameters at the upper section and the lower section, the upper-third position of the forming die 4 is an inner cavity A for placing copper pipe blanks and being capable of being embedded into the material returning compression molding die 3, the inner cavity B at the remaining third position of the lower section of the forming die 4 is the same as the outer diameter of the extruded copper pipe, and a transition inclined chamfer (the inclined chamfer is 45 degrees) of a flanging step of the formed copper pipe is arranged between the variable diameters of the upper section and the lower section of the forming die 4. In the novel structure, the inner hole of the material returning compression molding die 3 is a taper hole, the taper hole is equal to the outer diameter taper of the hot extrusion core rod 2, and the two taper holes are fixedly connected into a whole. In the novel structure, the depth of the upper section inner cavity A of the forming die 4 is smaller than the axial length of the material returning press forming die 3. Therefore, the withdrawing and the limit setting after the extrusion of the material returning compression mold 3 are convenient. In the above, the material returning press-forming die 3 is embedded into the forming die 4, so that a flanging step thickness gap of the extrusion-formed copper pipe is formed between the end part of the material returning press-forming die 3 and the reducing transition ends of the upper section and the lower section.

Fig. 2 shows a state that a copper pipe blank 8 is placed in an upper section inner cavity a of the forming die 4 in fig. 1, and the upper die 1 to be hot-extruded, the hot-extrusion core rod 2 and the material returning compression die 3 move downwards to perform the copper pipe blank 8 to be hot-extruded and formed.

Figure 3 shows a view of the copper tube blank extruded copper tube. When the hot extrusion upper die 1, the hot extrusion core bar 2 and the material returning compression mould 3 are synchronously moved downwards under the action of an oil press, the copper pipe blank 8 is subjected to hot extrusion through the material returning compression mould 3, the copper pipe blank 8 is extruded to enter the lower section inner cavity B in the forming die 4 to be formed into a copper pipe 9 and a flanging step 10, the formed copper pipe 9 and the flanging step 10 are formed in one step through the hot extrusion of the copper pipe blank 8, and the demoulding can be realized after the extrusion forming.

Fig. 4 shows the extruded copper tube 9 with a flanging step 10 at one end of the copper tube 9.

The specific extrusion forming process comprises the following steps: heating the copper pipe blank 8 to a temperature, placing the heated copper pipe blank into a cavity A at the upper section of a forming die 4, acting on a hot extrusion upper die 1, a hot extrusion core rod 2 and a material returning compression die 3 to synchronously move downwards under the pressure action of an oil press, acting on the material returning compression die 3 to extrude the copper pipe blank from an inner cavity A at the upper section of the forming die 4 to extrude the copper pipe blank into an inner cavity B at the lower section of the forming die 4, extruding a copper pipe 9 with a pipe wall thickness in a radial clearance shape between the outer diameter of the hot extrusion core rod 2 and the inner diameter of the inner cavity B at the lower section of the forming die 4, and extruding an upper flanging step 10 (shown in figure 4) of the formed copper pipe 9 by utilizing a clearance between the end part of the material returning compression die 3 and the reducing transition end at the upper section and the lower section of the forming die 4. And stopping moving downwards and returning when the extrusion limit is reached, and at the moment, acting the ejector rod 7 and the backing plate 5 to move upwards under the action of the hydraulic cylinder to eject the finally formed copper pipe 9 out of the forming die 4. In the whole extrusion process, the material returning compression mold 3 is a key part of the device, when a press machine moves downwards, the material returning compression mold acts on a copper pipe blank 8 as a lower compression mold to form the copper pipe blank, and when the press machine moves backwards, the material returning compression mold serves as a material returning device, so that the formed copper pipe is prevented from being locked on the hot extrusion core rod 2, the hot extrusion core rod 2 is ensured to move backwards smoothly, and when the copper pipe 9 is ejected out of the forming mold 4, the material returning compression mold 3 is separated from the copper pipe 9, and thus continuous production is realized. Therefore, the hot extrusion molding and material returning device of the horizontal continuous casting crystallizer with the steps naturally forms the steps of the horizontal continuous casting crystallizer through forward extrusion, does not have the problems of meat deficiency and small processing allowance, and greatly increases the qualification rate of products.

The utility model discloses an extrusion technology does: extruding a copper pipe blank (thick wall), sawing an end face, heating and forward extruding, and finishing.

The novel copper pipe blank extrusion forming device mainly solves the problems of copper pipe blank extrusion forming and meat shortage of flanging step parts in the extrusion forming process.

Claims (5)

1. A hot extrusion molding and material returning device of a horizontal continuous casting crystallizer with steps comprises a hot extrusion upper die and a connected hot extrusion core rod, wherein a molding die which is arranged at the same center and is arranged on a hot extrusion lower die is arranged corresponding to the lower part of the hot extrusion core rod, a backing plate and an ejector rod on the backing plate are arranged in the molding die and penetrate through the hot extrusion lower die; the hot extrusion core rod is a taper rod, and a material returning compression mold with a circular bead is arranged on the hot extrusion core rod; the forming die is provided with an inner cavity with variable diameters at the upper section and the lower section, the upper section of the forming die is an inner cavity for placing copper pipe blanks and being capable of being embedded into the material returning compression die, the lower section of the forming die is an inner cavity for extrusion forming of copper pipes, and flanging steps of the formed copper pipes are arranged between the variable diameters at the upper section and the lower section of the forming die to be in transition inclined chamfers.

2. The hot extrusion molding and material returning device of the horizontal continuous casting crystallizer with the step as claimed in claim 1, wherein the inner hole of the material returning compression mold is a taper hole, the taper hole has the same external diameter taper with the hot extrusion core rod, and the two parts are fixedly connected into a whole through the taper of the two parts.

3. The apparatus of claim 1, wherein the depth of the upper cavity of the forming mold is less than the axial length of the material-returning compression mold.

4. The hot extrusion molding and material returning device of the horizontal continuous casting crystallizer with the step as claimed in claim 1, wherein a gap of the thickness of the extrusion flanging step is formed between the end of the material returning compression mold and the position of the reducing transition end of the upper and lower sections of the embedded molding mold.

5. The hot extrusion forming and returning device of the horizontal continuous casting crystallizer with the steps as claimed in claim 1, wherein the formed copper tube and the flanging steps are formed in one step by hot extrusion of a blank.

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