CN105817552B - A kind of forming technology of expansion tightening wheel - Google Patents

Abstract

The invention discloses a forming process of a tensioner wheel, which belongs to the field of metal material processing. The forming process of the tensioner of the present invention includes: blanking→deep drawing→hot extrusion→cold extrusion→finishing→punching. Compared with the prior art, the present invention has the following advantages: it overcomes the defects of poor forming quality, low production efficiency, and large material waste in the prior art, adopts stamping and hot extrusion to form the tensioner, and effectively improves Improve the forming quality of parts, greatly reduce material waste, improve the production environment, use stamping and hot extrusion technology, can realize automatic production, improve production efficiency, reduce production cost, and meet the large demand of the market.

Description

A forming process of tensioner

technical field

The invention relates to the technical field of metal material processing and forming, in particular to a forming process of a tensioner wheel.

Background technique

The tensioner is a vulnerable part of spare parts such as automobiles, which needs to be replaced regularly, and the market demand is very large. At present, the production process of the tensioner is mainly casting and machining. When the tensioner is produced by the casting process, it is easy to have shrinkage cavity and shrinkage in the three areas of the gating system, the root of the riser, and the bottom of the tensioner casting, which affects the forming quality of the tensioner, and the production conditions of the casting are harsh. Another technique for producing the tensioner is to bore the bar with a boring machine, which is used as the shaft hole of the tensioner, and then the bar is machined. This method has low production efficiency and large material waste.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a forming process of the tensioner, in order to achieve the purpose of improving production efficiency and saving materials.

The present invention is achieved through the following technical solutions:

A forming process of a tensioning wheel, the forming process is carried out as follows:

(1) Blanking: carry out blanking forming to the steel plate to obtain disc-shaped blank;

(2) Deep-drawing: deep-drawing the disc-shaped blank to obtain a bowl-shaped deep-drawn part;

(3) Hot extrusion: After the bowl-shaped deep-drawn part is rapidly heated to exceed its recrystallization temperature, it is hot-extruded to obtain a hot-extruded part. The mouth of the hot-extruded part forms a horizontally outwardly extending mouth. The upper flange, the middle of the bottom of the hot extrusion part is extruded to form a thin sheet, and a convex ring extending vertically is formed around the bottom;

(4) Cold extrusion: After the hot extrusion is air-cooled to normal temperature, cold extrusion is carried out, and the convex ring at the bottom of the hot extrusion is extruded to form a trumpet-shaped flanging with a small inside and a large outside to obtain a cold extrusion. Extrusion;

(5) finishing: flatten the flanging at the bottom of the cold extruded part to form a bottom flange corresponding to the mouth flange, to obtain a finished part;

(6) Punching: Punching the sheet at the bottom of the finished part to get the tensioner.

In the step (3), the bowl-shaped drawn part is heated to 700-900° C., and then hot-extruded.

In the step (3), the hot extruded part forms a central hole with an open mouth and a closed bottom, and a stepped hole is provided at the mouth of the central hole, and the diameter of the stepped hole is larger than that of the central hole .

In the step (6), the thin sheet at the bottom of the finishing piece is punched to form a bottom hole, and the diameter of the bottom hole is smaller than the diameter of the central hole.

In the step (5), the mouth flange, the bottom flange and the outer side wall of the finished part jointly form an annular accommodation groove for accommodating the belt.

The thickness of the incoming steel plate is 5mm.

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

1. The forming process of a tensioner wheel provided by the present invention overcomes the large amount of material waste and low production efficiency in the prior art due to the adoption of plastic forming methods such as deep drawing, hot extrusion, cold extrusion, and finishing. , Poor production environment and other issues have brought technical effects such as high material utilization rate, high production efficiency and low cost.

2. The forming process of a tensioner wheel provided by the present invention, the incoming steel plate is blanked to form a disc-shaped blank, and then formed into a bowl-shaped drawn part by deep drawing, and then the bowl-shaped drawn part is hot-extruded , forming a hot extrusion part with a mouth flange extending horizontally outwards at the mouth, a thin sheet formed in the middle of the bottom due to extrusion, and a convex ring extending vertically around the bottom. The use of hot extrusion can effectively reduce the metal The deformation resistance increases the plastic forming performance of the metal, which is conducive to the large plastic deformation of the material and improves the forming quality of the part. Moreover, the forming force required for the metal during hot extrusion forming becomes smaller, and the tonnage requirement for the forming equipment is not high.

3. The forming process of a tensioner provided by the present invention is to air-cool the hot extrusion to room temperature, and then carry out cold extrusion to form a cold extrusion. The purpose of cold extrusion is to form a vertical direction around the bottom The extended convex ring is extruded to form a trumpet-shaped flanging with a small inside and a big outside, so as to facilitate the forming of the parts in the next process. The cold extrusion process can effectively reduce the deformation of the parts and reduce the forming force, thereby improving the forming quality of the parts, and Prepare for forming the bottom flange.

4. The forming process of a tensioner wheel provided by the present invention is to finish the flanging of the cold extruded part to form a bottom flange to obtain a finished part. The bottom flange can be effectively formed by the finishing process and the parts can be improved. Forming accuracy.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

Fig. 2 is a schematic diagram of the structure of the disk-shaped blank of the present invention.

Fig. 3 is a structural schematic diagram of the bowl-shaped drawing part of the present invention.

Fig. 4 is a schematic structural view of the hot extrusion part of the present invention.

Fig. 5 is a structural schematic diagram of the cold extruded part of the present invention.

Fig. 6 is a structural schematic diagram of the finishing part of the present invention.

Fig. 7 is a structural schematic diagram of the tensioning wheel of the present invention.

Numbers in the figure: 1 disc-shaped blank, 2 bowl-shaped deep-drawn part, 3 hot-extruded part, 4 mouth flange, 5 sheet, 6 protruding ring, 7 flanging, 8 cold-extruded part, 9 bottom flange, 10 finishing parts, 11 tensioner wheels.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

A forming process of the tensioner 11, the forming process is carried out according to the following steps: Figure 1 shows the process flow of the tensioner 11. A disc-shaped blank 1 is obtained by blanking the incoming steel plate with a thickness of 5 mm. The schematic diagram of the structure of the disc-shaped blank 1 is shown in FIG. 2 . Then, the disc-shaped blank 1 is drawn and formed to obtain a bowl-shaped deep-drawn part 2 , and the structure diagram of the bowl-shaped deep-drawn part 2 is shown in FIG. 3 . Place the bowl-shaped drawing part 2 on the resistance wire and heat it rapidly to exceed its recrystallization temperature, for example, the heating temperature can be 700-900 °C, and then carry out hot extrusion forming to obtain the hot extrusion part 3, the hot extrusion part 3 There is a central hole with an opening and a closed bottom inside, and the mouth of the central hole is provided with a stepped hole, and the diameter of the stepped hole is larger than that of the central hole. The mouth of the hot extrusion 3 has a mouth flange 4 extending horizontally outwards. The middle of the bottom of the hot extrusion 3 is extruded to form a thin sheet 5, and a protruding ring 6 extending vertically is formed around the bottom. A schematic diagram of the structure of the extruded part 3 is shown in FIG. 4 . Then the hot extruded part 3 is taken out from the mold and placed in the air for air cooling to normal temperature, and then cold extruded. The large trumpet-shaped flanging 7 is used to obtain a cold extruded part 8 , and the structural schematic diagram of the cold extruded part 8 is shown in FIG. 5 . Then the cold extruded piece 8 is finished. Finishing is to flatten the flanging 7 at the bottom of the cold extruded piece 8 to form a bottom flange 9 corresponding to the mouth flange 4 to obtain a finished piece. The flange 4, the bottom flange 9 and the outer side wall of the finishing part jointly form an annular accommodation groove for accommodating the belt. The structural diagram of the finishing part is shown in FIG. 6 . Finally, the sheet 5 at the bottom of the finished part is punched to obtain the tensioner 11. The sheet 5 at the bottom of the finished part is punched to form a bottom hole, and the aperture of the bottom hole is smaller than the aperture of the center hole. The structure diagram of the tensioner 11 As shown in Figure 7.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (6)

1. a forming process of tensioner, is characterized in that, described forming process is carried out as follows: (1) Blanking: carry out blanking forming to the steel plate to obtain disc-shaped blank; (2) Deep-drawing: deep-drawing the disc-shaped blank to obtain a bowl-shaped deep-drawn part; (3) Hot extrusion: After the bowl-shaped deep-drawn part is rapidly heated to exceed its recrystallization temperature, it is hot-extruded to obtain a hot-extruded part. The mouth of the hot-extruded part forms a horizontally outwardly extending mouth. The upper flange, the middle of the bottom of the hot extrusion part is extruded to form a thin sheet, and a convex ring extending vertically is formed around the bottom; (4) Cold extrusion: After the hot extrusion is air-cooled to normal temperature, cold extrusion is carried out, and the convex ring at the bottom of the hot extrusion is extruded to form a trumpet-shaped flanging with a small inside and a large outside to obtain a cold extrusion. Extrusion; (5) finishing: flatten the flanging at the bottom of the cold extruded part to form a bottom flange corresponding to the mouth flange, to obtain a finished part; (6) Punching: Punching the sheet at the bottom of the finished part to get the tensioner. 2. The forming process of a tensioner according to claim 1, characterized in that, in the step (3), the bowl-shaped drawn part is heated to 700-900°C, and then hot-extruded take shape. 3. The forming process of a tensioner wheel according to claim 1, characterized in that, in the step (3), the hot extruded part forms a center hole with an opening at the mouth and a closed bottom, and the center hole is The mouth of the hole is provided with a stepped hole, and the diameter of the stepped hole is larger than that of the central hole. 4. The forming process of a tensioner wheel as claimed in claim 3, characterized in that, in the step (6), the thin sheet at the bottom of the finished part is punched to form a bottom hole, and the bottom hole of the bottom hole The aperture is smaller than the aperture of the central hole. 5. The forming process of a tensioner wheel according to claim 1, characterized in that, in the step (5), the mouth flange, the bottom flange and the outer side wall of the finished part jointly form an accommodating Ring housing for the belt. 6. The forming process of a tensioner wheel as claimed in claim 1, wherein the thickness of the incoming steel plate is 5mm.