CN203265502U - Hot forging device for transmission shaft joint fork with horizontal fork part - Google Patents

Abstract

A hot forging device for a transmission shaft yoke with a horizontal fork in the technical field of forging, comprising: a flat die for flat dies for blanks, a bending die for pre-forging and bending of blanks, and a pre-forging The final forging die for final forging. The bending die includes: a punch and a die that are co-located on the upper and lower sides, wherein: the working part of the punch has a circular arc-shaped convex cross-section, and the working part of the die has a trapezoidal shape that matches the bottom shape of the pre-forging Groove. Compared with the horizontal open die forging, the utility model can directly forge the axial blind hole on the transmission shaft yoke prepared by the utility model, which saves the subsequent machining process, and the flash metal consumption is small, and the material utilization rate reaches 85% %. Compared with the vertical hot extrusion forming, the utility model has the advantages of convenient implementation and stable process; the mold is relatively simple and the mold manufacturing cost is low.

Description

Hot forging device for transmission shaft yoke with horizontal fork

technical field

The utility model relates to a device in the field of forging and forming technology, in particular to a hot forging device for a transmission shaft yoke with a horizontal fork. the

Background technique

The transmission shaft fork is a key component in the transmission mechanism of the automobile. It needs to bear a large load during the transmission process, and the working conditions are poor. Therefore, such parts require high strength and good toughness. The manufacturing method of cutting is low in efficiency and difficult to meet its mechanical performance requirements. It is generally forged from high-quality alloy steel. the

After searching the existing technology, it was found that the "Forging Technology" in the 06th issue of 2010 disclosed "Research on the Precision Die Forging Process of Automobile Drive Shaft Forks", which recorded that the open die forging process of horizontal splitting is often used in the production of drive shaft forks For such parts, the die forging process is blanking, heating, flattening, pre-forging, splitting, final forging, and finally edge trimming. However, this process cannot forge axial blind holes, and subsequent machining is required, which consumes a lot of materials. At the same time, a flash will be formed between the two forks. For a horizontal fork with a long distance between the two forks, there will be more flash metal, which often exceeds 30% of the forging's own weight, resulting in a low material utilization rate. the

"Forging Equipment and Manufacturing Technology" published "Research on Precision Forming of Transmission Shaft Flange Fork" in the 06th issue of 2004, which recorded a hot extrusion forming process for the transmission shaft fork. , Extrusion fine forming, finishing. The process extrudes blind vias and reduces flash, thereby improving material utilization. However, this process uses a closed die, which has a large extrusion force and high requirements on the die material; the die structure is complex and the manufacturing cost is high; and the billet size needs to be strictly controlled, so the process implementation is not convenient. the

Utility model content

The utility model aims at the above-mentioned deficiencies in the prior art, and provides a hot forging device for a transmission shaft yoke with a horizontal fork, with the purpose of realizing stable batch production of transmission shaft yoke forgings with a horizontal fork. the

The utility model is realized through the following technical solutions. The utility model relates to a device for the above-mentioned hot forging method, including: a flat die used for flat die of a blank, a bending die used for pre-forging and bending of a blank And final forging dies for final forging forming of pre-forgings. the

The flat mold includes: an upper mold plate, an upper mold fixing plate, an upper backing plate, and an upper mold connected sequentially from top to bottom; and a lower mold connected sequentially from top to bottom for adjusting the height of mold cavity The lower backing plate, the lower mold fixing plate and the lower template. the

The working parts of the upper die and the lower die of the flat die both have horizontal sections. the

The bending die includes: a punch and a die that are co-located on the upper and lower sides, wherein: the working part of the punch has a circular arc-shaped convex cross-section, and the working part of the die has a trapezoidal shape that matches the bottom shape of the pre-forging Groove. the

The arc radius R of the convex section of the punch is 80mm-100mm. the

The cavity slope α of the trapezoidal groove of the concave mold is 7°-9°. the

A positioning groove is symmetrically distributed on both sides of the trapezoidal groove, the depth of the positioning groove is 0.8mm-1.5mm, and the width matches the length of the formed pre-forging. the

The depth H of the trapezoidal groove is 2.0 mm to 3.0 mm deeper than the cavity depth of the final forging die. the

The final forging die is a vertical split mode, the flash grooves of the cavity are distributed along the surface, and the shape and size of the cavity match the shape and size of the pre-designed forging. the

The height of the flash edge groove is 2.0mm-4.0mm. the

Beneficial effect

Compared with the horizontal open die forging, the axial concave feature of the middle part of the transmission shaft yoke prepared by the utility model can be directly forged, that is, the axial blind hole can be directly forged, and the subsequent machining process is omitted, and The flash metal consumption is small, and the material utilization rate reaches 85%. Compared with the vertical hot extrusion forming, the utility model has the advantages of convenient implementation and stable process; the mold is relatively simple and the mold manufacturing cost is low. the

Description of drawings

Fig. 1 is the schematic diagram of pre-forging bending die;

Fig. 2 is the punch of pre-forging bending die;

Fig. 3 is the die of pre-forging bending die;

Fig. 4 is a schematic diagram of flat die structure;

Fig. 5 is the punch of final forging die;

Figure 6 is the die of the final forging die. the

Detailed ways

The following is a detailed description of the embodiments of the present utility model. This embodiment is implemented on the premise of the technical solution of the present utility model, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present utility model is not limited to the following the described embodiment. the

Example 1

The hot forging device of this embodiment includes: a flat die used for flat die flat die for billet, a bending die used for pre-forging and bending of billet, and a final forging die used for final forging of pre-forged piece 1 . the

The flat die includes: an upper die and a lower die whose working parts both have horizontal sections. the

As shown in Fig. 1 to Fig. 3, described bending mold comprises: the convex mold 2 and the concave mold 3 that upper and lower cooperate to arrange, wherein: the working part of convex mold 2 has circular arc outward convex section, the concave mold 3 The working part has a trapezoidal groove matching the bottom shape of the pre-forging 1. the

The arc radius R of the convex section of the punch 2 is 80mm-100mm. the

The cavity slope α of the trapezoidal groove of the concave mold 3 is 7°-9°. the

A positioning groove is symmetrically distributed on both sides of the trapezoidal groove, the depth of the positioning groove is 0.8mm-1.5mm, and the width matches the length of the formed pre-forging 1 . the

The depth H of the trapezoidal groove is 2.0 mm to 3.0 mm deeper than the cavity depth of the final forging die. the

As shown in Figure 4, the flat mold includes: the upper mold and the lower mold with a horizontal cross-section in the working part, wherein: in the figure from top to bottom, the upper mold 4, the upper mold fixing plate 5, the upper pad Plate 6, upper mold 7, lower mold 8, lower backing plate 9, lower mold fixing plate 10 and lower template 11. the

As shown in Figure 5 and Figure 6, the final forging die is a vertical split mode, the flash grooves of the die cavity are distributed along the profile, and the shape and size of the die cavity match the shape and size of the pre-designed forging. the

The height of the flash edge groove is 2.0mm-4.0mm. the

This device realizes the hot forging of the transmission shaft yoke with the horizontal fork in the following way. The sequence of steps includes: blanking, heating, flattening twice, pre-forging and bending, final forging and edge trimming, specifically including the following steps:

Step 1, blanking: use round bar material for sawing and blanking, and the ratio of height to diameter of the blank is not greater than 1.5;

Step 2. Preheating the die: heating the pre-forging and final forging dies to keep the die temperature at 200°C to 300°C;

Step 3. Heating the billet: place the billet in an intermediate frequency furnace and heat it to 1100°C~1150°C;

Step 4. Flatten the flat mold twice: put the blank horizontally, flatten the flat mold, then rotate 90° and flatten again, and shoot the blank into a strip shape, with the thickness controlled at 50mm to 55mm;

Step 5. Pre-forging and bending: place the strip-shaped blank in a bending die with a specific shape, and perform bending and flattening. The thickness of the end of the pre-forging is controlled at 34mm to 38mm;

Step 6, final forging forming: place the pre-forging 1 in the die cavity of the final forging mold, and perform final forging;

Step 7, edge trimming: place the forging obtained in step 6 on the edge trimming die, and cut off excess flash to obtain the final shape of the forging. the

Example 2

For a certain type of transmission shaft fork, the material is SAE1141 alloy steel, and the processing equipment is a 40000kN hot die forging press. The process is as follows:

1. Blanking: round bar material is used for sharp cutting and blanking, and the blank size is Φ70×134mm;

2. Preheating the mold: heat the pre-forging mold and the final forging mold, and heat the mold to 220°C;

3. Heating the billet: place the billet in an intermediate frequency furnace and heat it to 1100°C;

4. Flattening of the flat mold: put the blank horizontally, and flatten the flat mold for the first time, adjust the thickness of the lower backing plate 9, control the reduction to 20mm, then rotate 90° and then flatten the flat mold once, and shoot the blank In the shape of a long strip, the thickness of the end after being flattened is 50mm;

5. Pre-forging and bending: place the strip-shaped blank in a bending die with a specific shape, and perform bending and flattening. The arc radius R of the bending punch 2 is 90 mm, and the cavity depth H of the bending die 3 is 22 mm. The cavity slope α is 9°, and the thickness of the blank after flattening is 34mm;

6. Final forging forming: Place the pre-forging 1 vertically in the final forging die cavity for final forging, with flash thickness of 2.3mm;

7. Trimming: Place the final forging in the trimming die, punch and trim to obtain the final forging. the

The forgings obtained in this example are fully filled, high in strength, the weight of the billet is 4.04kg, the mass of the forging is 3.43kg, the material utilization rate reaches 85%, and no cracks are found after the magnetic particle flaw detection. the

Example 3

For a certain type of transmission shaft fork, the material is SAE1141 alloy steel, and the processing equipment is a 40000kN hot die forging press. The process is as follows:

1. Blanking: round bar material is used for sharp cutting and blanking, and the blank size is Φ70×134mm;

2. Preheating the mold: heat the pre-forging mold and the final forging mold, and heat the mold to 250°C;

3. Heating the billet: place the billet in an intermediate frequency furnace and heat it to 1150°C;

4. Flattening of the flat mold: place the billet horizontally, flatten the flat mold for the first time, adjust the thickness of the lower backing plate 9, control the reduction to 15mm, then rotate 90° and then flatten the flat mold once, and clap the blank In the shape of a long strip, the thickness of the end after being flattened is 55mm;

5. Pre-forging and bending: Place the strip-shaped blank in a bending die with a specific shape for bending and flattening. The arc radius R of the bending punch 2 is 90mm, and the cavity depth H of the bending die 3 is 25mm , the cavity slope α is 9°, and the thickness of the blank after flattening is 33mm;

6. Final forging: place the pre-forging 1 vertically in the cavity of the final forging for final forging, and the flash thickness is 2.8mm;

7. Trimming: Place the final forging in the trimming die, punch and trim to obtain the final forging. the

The forgings obtained in this example are fully filled, high in strength, the weight of the billet is 4.04kg, the mass of the forging is 3.43kg, the material utilization rate reaches 85%, and no cracks are found after the magnetic particle flaw detection. the

Example 4

For a certain type of transmission shaft fork, the material is No. 45 steel, and the processing equipment is a 40000kN hot die forging press. The process is as follows:

1. Blanking: round bar material is used for sharp cutting and blanking, and the blank size is Φ70×134mm;

2. Preheating the mold: heat the pre-forging mold and the final forging mold, and heat the mold to 250°C;

3. Heating the billet: place the billet in an intermediate frequency furnace and heat it to 1120°C;

4. Flattening of the flat mold: place the billet horizontally, flatten the flat mold for the first time, adjust the thickness of the lower backing plate 9, control the reduction to 20mm, then rotate 90° and then flatten the flat mold once, and clap the blank In the shape of a long strip, the thickness of the end after being flattened is 50mm;

5. Pre-forging and bending: Place the strip-shaped blank in a bending die with a specific shape for bending and flattening. The arc radius R of the bending punch 2 is 90mm, and the cavity depth H of the bending die 3 is 25mm , the cavity slope α is 8°, and the thickness of the blank after flattening is 34mm;

6. Final forging: place the pre-forging 1 vertically in the cavity of the final forging for final forging with a flash thickness of 3.0mm;

7. Trimming: Place the final forging in the trimming die, punch and trim to obtain the final forging. the

The forgings obtained in this example are fully filled, high in strength, the weight of the billet is 4.04kg, the mass of the forging is 3.43kg, the material utilization rate reaches 85%, and no cracks are found after the magnetic particle flaw detection. the

Claims (10)

1. A hot forging device with a transmission shaft joint yoke with a horizontal fork, it is characterized in that it includes: a flat die for flat die of a blank, a bending die for pre-forging bending of a blank, and a bending die for pre-forging The final forging die for the final forging of forgings. 2. The device according to claim 1, characterized in that, said flat die comprises: an upper formwork, an upper die fixing plate, an upper backing plate, and an upper die connected sequentially from top to bottom; The set lower mold, the lower backing plate for adjusting the height of mold cavity clamping, the lower mold fixing plate and the lower template are sequentially connected. 3. The device according to claim 2, characterized in that, the working parts of the upper die and the lower die of the flat die all have a horizontal section. 4. The device according to claim 1, characterized in that, the bending mold comprises: a punch and a die arranged in cooperation with the upper and lower parts, wherein: the working part of the punch has a circular arc-shaped convex section, and the concave The working part of the die has a trapezoidal groove that matches the shape of the bottom of the pre-forging. 5. The device according to claim 4, characterized in that, the arc radius R of the convex section of the punch is 80mm-100mm. 6. The device according to claim 4, characterized in that, the cavity slope α of the trapezoidal groove of the concave mold is 7°-9°. 7. The device according to claim 4, characterized in that a positioning groove is symmetrically distributed on both sides of the trapezoidal groove, the depth of the positioning groove is 0.8 mm to 1.5 mm, and the width is the same as the length of the formed pre-forging match. 8. The device according to claim 4, characterized in that the depth H of the trapezoidal groove is 2.0 mm to 3.0 mm deeper than the cavity depth of the final forging die. 9. The device according to claim 1, characterized in that the final forging die is a vertical split mode, and the flash grooves of the die cavity are distributed along the mold surface. 10. The device according to claim 9, characterized in that, the height of the flash edge groove is 2.0mm-4.0mm.

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