A large forging bending tool

Abstract

The present invention mainly relates to a large forging bending tool, including a tool upper die and a tool lower die. The tool upper die includes a base and a convex head arranged on the base, and a flow limiting groove for fixing the forming blank is arranged along the arc structure of the convex head, so that the tool upper die can steadily push the forming blank downward during the blank forming process. The side walls of the flow limiting groove have the same structure and are composed of three sections of independent convex baffles connected to each other; the tool lower die includes a forming part, which is a concave belt structure with high ends and low middle, corresponding to the convex head of the tool upper die. The large forging bending tool described in the present invention can integrate the multiple bending, flattening, and re-bending processes of large forgings in the traditional free forging bending process into a one-time forming process, so that large and complex shaped forming blanks can not only be formed in one time, but also have good precision of the formed shape, high consistency and low forming fire rate, which greatly reduces the production cost while improving production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of large forging bending forming, and in particular relates to a large forging bending tool which can prevent both sides of the forging from expanding and deforming outwards during the large forging bending forming process. Background Art

[0002] For large, complex-shaped blanks, the sides of the bend will expand and deform outward during the forging bending process, requiring flipping, flattening, and then bending again. Particularly for blanks with a shape on the back, multiple free forging passes, including bending, flattening, and re-bending, are required, along with membrane forming. The resulting shape is affected by human factors, leading to problems such as multiple firings, low efficiency, and poor shape consistency. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a large forging bending tool which has high efficiency, low production cost and can be formed in one forging operation.

[0004] The present invention provides a large forging bending tool, comprising a tool upper die and a tool lower die, the tool upper die comprising a base and a convex head arranged on the base, the top of the convex head being an arc structure, and a flow limiting groove for fixing the forming blank is arranged along the arc structure of the convex head, so that the tool upper die can smoothly push the forming blank downward during the forming process of the blank; the flow limiting groove is a concave groove structure, which can not only fix the position of the forming blank during the bending forming, but also hinder the material of the forming blank from flowing toward the two sides of the tool upper die during the bending forming process; the side walls of the flow limiting groove have the same structure, and are composed of three sections of independent convex baffles connected to each other, and the top of each section of the convex baffle in the same side wall has a different height from the bottom of the flow limiting groove, the top of the convex baffle in the middle section of the same side wall has the highest height from the bottom of the flow limiting groove, and the height of the connection between adjacent convex baffles from the bottom of the flow limiting groove is lower than the height of the top of the convex baffle from the bottom of the flow limiting groove;

[0005] The lower die of the tooling includes a forming part, which is a concave strip structure with high ends and low middle, corresponding to the convex head of the upper die of the tooling; a first positioning platform is provided at the end position of one end of the forming part, and a second positioning platform is provided at the end position of the other end of the forming part. The first positioning platform and the second positioning platform are both provided with an inner corner structure for positioning and placing pre-formed forming blanks, and the height of the bottom surface of the first positioning platform from the bottom of the lower die of the tooling is lower than the height of the bottom surface of the second positioning platform from the bottom of the lower die of the tooling.

[0006] Preferably, the inner side of the side wall of the flow limiting groove adopts a draft angle design, and the value of the draft angle is between 1° and 3°;

[0007] Preferably, the vertical surface of the inner angle structure of the first positioning platform has an angle with the vertical direction, and the angle value of the angle is between 20° and 30°; lower stoppers are also symmetrically provided on both sides of the first positioning platform and the second positioning platform.

[0008] Preferably, the forming portion of the lower die of the tooling is further provided with a back groove recessed in the surface of the forming portion.

[0009] Preferably, protruding blocks protruding from the sides of the forming portion are symmetrically provided on the bottom of both sides of the forming portion to increase the stability of the lower die of the tooling.

[0010] Preferably, the distance value between the two side walls of the flow limiting groove is composed of the width value of the formed blank and the first gap distance value. The first gap distance is the gap distance between the single-side outer wall of the formed blank pre-formed in the flow limiting groove and the inner side of the corresponding side wall of the flow limiting groove. The single-side first gap distance value is between 3mm and 8mm.

[0011] Preferably, the distance value between each group of lower stops is composed of the width value of the formed blank and the second gap distance value. The second gap distance is the sum of the gap distances between the outer walls on both sides of the pre-formed formed blank between each group of lower stops and the inner sides of the side walls of the corresponding side lower stops. The second gap distance value is between 6mm and 10mm.

[0012] By adopting the large forging bending tooling described in the present invention, the multiple bending, flattening, and re-bending processes of large forgings in the traditional free forging bending process can be integrated into a one-time forming process. In particular, it can also form a forming blank with a special shape on the back in one time, so that large and complex shaped forming blanks can not only be formed in one time but also have good precision, high consistency and low forming fire number of the formed shape, thereby greatly reducing production costs while improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the tooling upper mold;

[0014] Figure 2 This is a schematic diagram of the main view direction of the upper die of the tooling;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the tooling upper die in the main viewing direction;

[0016] Figure 4 Schematic diagram of the three-dimensional structure of the tooling lower die;

[0017] Figure 5 This is a schematic diagram of the cross-sectional structure of the tooling lower die in the main viewing direction;

[0018] Figure 6This is a schematic diagram of the relative position relationship between the upper die, the forming blank and the lower die at the beginning of forging;

[0019] Figure 7 This is a schematic diagram of the relative position relationship between the upper die of the tooling, the formed blank and the lower die of the tooling at the end of forging;

[0020] In the figure, 1 is a tooling upper die, 2 is a tooling lower die, 3 is a formed blank, 4 is a base, 5 is a convex head, 6 is a flow limiting groove, 7 is a side wall, 8 is a convex baffle, 9 is a forming part, 10 is a lower block, 11 is a first positioning platform, 12 is a second positioning platform, 13 is a back groove, 14 is a raised block, and 15 is an angle. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Example

[0023] like Figures 1 to 3 As shown, a large forging bending tool comprises a tool upper die 1 and a tool lower die 2, which is mainly used for bending and shaping large-sized special-shaped end forgings with a size of 1 meter to 2 meters. The tool upper die 1 comprises a base 4 and a convex head 5 arranged on the base 4. The top of the convex head 5 is an arc structure, and a flow limiting groove 6 for fixing the forming blank 3 is arranged along the arc structure of the convex head 5, so that the tool upper die 1 can smoothly push the forming blank 3 downward during the blank forming process. The flow limiting groove 6 is a concave groove structure, which can not only fix the position of the forming blank 3 during the bending process, but also prevent the material of the forming blank 3 from flowing toward the two sides of the tool upper die 1 during the bending process. The side walls 7 on both sides of the flow limiting groove 6 have the same structure, and are composed of three independent convex baffles 8 connected to each other. The top of each section of the convex baffle 8 in the same side wall 7 is at a different height from the bottom of the flow limiting groove 6, corresponding to different deformation zones of the forming blank 3. The top of the convex baffle 8 in the middle section of the same-side sidewall 7 is at the highest height from the bottom of the flow-limiting groove 6. The connection between adjacent convex baffles 8 is at a lower height from the bottom of the flow-limiting groove 6 than the top of the convex baffle 8. The convex baffle 8 in the middle section corresponds to the area where the material of the blank 3 expands the most during the bending process. The convex baffles 8 on either side of the middle section correspond to the areas where the material expands less during the bending process. The top of each group of convex baffles 8 is at a different height from the bottom of the flow-limiting groove 6 to facilitate demolding of the blank 3 after bending.

[0024] In this embodiment, the distance between the side walls 7 on both sides of the flow limiting groove 6 of the tooling upper die 1 is set according to the width of the forming blank 3. The distance value between the side walls 7 on both sides of the flow limiting groove 6 is composed of the width value of the forming blank 3 and the first gap distance value. The first gap distance is the gap distance between the outer wall of a single side of the forming blank 3 pre-formed in the flow limiting groove 6 and the inner side of the side wall 7 corresponding to the flow limiting groove 6. The first gap distance value on one side is between 3mm and 8mm. In this embodiment, the first gap distance value on one side is 4.5mm. At the same time, the inner side of the side wall 7 of the flow limiting groove 6 adopts a draft angle design. The draft angle value is between 1° and 3°, so that the forming blank 3 can be smoothly demolded when the tooling upper die 1 retracts after the forming is completed. At the same time, because the forming blank 3 belongs to the large forging category, the weight of the forging itself is also conducive to the smooth demolding of the forming blank 3.

[0025] like Figure 4 and Figure 5 As shown, the tooling lower die 2 includes a forming portion 9, which is a concave strip-shaped structure with high ends and low middle, corresponding to the convex portion 5 of the tooling upper die 1. In addition, a first positioning platform 11 is provided at the end position of one end of the forming portion 9, and a second positioning platform 12 is provided at the end position of the other end of the forming portion 9. Both the first positioning platform 11 and the second positioning platform 12 are provided with an inner folding angle structure for positioning and placing the preformed forming blank 3. In this embodiment, the forming blank 3 to be bent is a special-shaped end forging with a protruding portion at one end, so the forming portion 9 for placing the forming blank 3 adopts a high-low end design, and the height of the bottom surface of the first positioning platform 11 from the bottom of the tooling lower die 2 is lower than the height of the bottom surface of the second positioning platform 12 from the bottom of the tooling lower die 2. The lower first positioning platform 11 is used to position the larger end of the formed blank 3, while the higher second positioning platform 12 is used to position the other end of the formed blank 3. The height difference and horizontal distance between the first positioning platform 11 and the second positioning platform 12 enable the formed blank 3 with a special-shaped end to be positioned at a predetermined angle on the forming section 9, thereby preventing the opening of the formed blank 3 from forming a negative angle during forming and thus affecting the bending of the blank. The angle at which the formed blank 3 is placed on the forming section 9 is determined by the size of the protrusion at the larger end of the formed blank 3.

[0026] The vertical angle of the angled structure within the first positioning platform 11 forms an angle 15 with the vertical direction. The angle 15 is between 20° and 30° to prevent the large end of the formed blank 3 from interfering with the first positioning platform 11 during the bending process. In this embodiment, the angle 15 is 25°. Lower stops 10 are symmetrically positioned on both sides of the first positioning platform 11 and the second positioning platform 12 to limit the position of the formed blank 3 when placed within the forming section 9. The distance between each set of lower stops 10 is also set according to the width of the formed blank 3. The distance between each set of lower stops 10 is composed of the width of the formed blank 3 and a second gap distance. The second gap distance is the sum of the gap distance between the outer walls of the preformed formed blank 3 and the inner side walls of the corresponding lower stop 10 between each set of lower stops 10. The second gap distance is between 6mm and 10mm. In this embodiment, the second gap distance is 8mm to facilitate smooth placement of the blank into the positioning position of the forming section 9.

[0027] In this embodiment, the forming portion 9 of the lower tooling die 2 is further provided with a back groove 13 recessed into the surface of the forming portion 9. This back groove 13 is used to form the back of the formed blank 3. The position and shape of the back groove 13 can be specifically set according to actual parameters. Also symmetrically positioned on the bottom of each side of the forming portion 9 are protruding blocks 14 protruding from the sides of the forming portion 9 to enhance the stability of the lower tooling die 2 during the bending process of the formed blank 3.

[0028] The specific steps of bending a formed blank using the large forging bending tool of the present invention are as follows:

[0029] Step 1: First, heat the forming blank 3 to the set temperature. When the forming blank 3 is made of titanium alloy, the heating temperature is set to 950 degrees Celsius. When the forming blank 3 is made of high-strength steel, the heating temperature is set to 1000 degrees Celsius. At the same time, preheat the tooling upper die 1 and the tooling lower die 2 to a temperature that matches the set temperature of the forming blank 3.

[0030] Step 2: Place the formed blank 3 at a specific temperature on the lower die 2 of the tooling under the clamping of the mechanical equipment, as shown in the following figure: Figure 6 As shown;

[0031] Step 3: The upper die 1 of the tooling moves downward. As the upper die 1 moves downward, the formed blank 3 is forged and formed under the common structure of the upper die 1 and the lower die 2.

[0032] Step 4: The upper die 1 of the tooling performs the final forging according to the preset stroke distance, such as Figure 7 As shown, after forming is completed, the upper die 1 of the tooling retracts.

[0033] By adopting the large forging bending tooling described in the present invention, the multiple bending, flattening, and re-bending processes of large forgings in the traditional free forging bending process can be integrated into a one-time forming process. In particular, it can also form a forming blank with a special shape on the back in one time, so that large and complex shaped forming blanks can not only be formed in one time but also have good precision, high consistency and low forming fire number of the formed shape, thereby greatly reducing production costs while improving production efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that modifications or equivalent replacements of the technical solution of the present invention without departing from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A large forging bending tool, comprising an upper tooling die and a lower tooling die, characterized in that: The tooling upper die includes a base and a convex head arranged on the base, the top of the convex head is an arc structure, and a flow limiting groove for fixing the forming blank is arranged along the arc structure of the convex head, so that the tooling upper die can steadily push the forming blank downward during the blank forming process; the flow limiting groove is a concave groove structure, which can not only fix the position of the forming blank during the bending forming, but also prevent the material of the forming blank from flowing toward the two sides of the tooling upper die during the bending forming process; the side walls of the flow limiting groove have the same structure, and are composed of three independent convex baffles connected to each other, and the top of each convex baffle in the same side wall is at a different height from the bottom of the flow limiting groove. , the height between the top of the convex baffle in the middle section of the side wall on the same side and the bottom of the flow limiting groove is the highest, and the height between the connection between adjacent convex baffles and the bottom of the flow limiting groove is lower than the height between the top of the convex baffle and the bottom of the flow limiting groove; the inner side of the side wall of the flow limiting groove adopts a draft angle design, and the value of the draft angle is between 1° and 3°; the distance value between the side walls on both sides of the flow limiting groove is composed of the width value of the formed blank and the first gap distance value, and the first gap distance is the gap distance between the outer wall of the single side of the formed blank pre-formed in the flow limiting groove and the inner side of the side wall corresponding to the flow limiting groove, and the first gap distance value on one side is between 3mm and 8mm; The lower die of the tooling includes a forming part, which is a concave strip structure with high ends and low middle, corresponding to the convex head of the upper die of the tooling; a first positioning platform is provided at the end position of one end of the forming part, and a second positioning platform is provided at the end position of the other end of the forming part. The first positioning platform and the second positioning platform are both provided with an inner corner structure for positioning and placing pre-formed forming blanks, and the height of the bottom surface of the first positioning platform from the bottom of the lower die of the tooling is lower than the height of the bottom surface of the second positioning platform from the bottom of the lower die of the tooling.

2. A large forging bending tool according to claim 1, characterized in that: There is an angle between the vertical surface of the inner angle structure of the first positioning platform and the vertical direction, and the angle value of the angle is between 20° and 30°; lower stoppers are symmetrically arranged on both sides of the first positioning platform and the second positioning platform.

3. A large forging bending tool according to claim 2, characterized in that: The forming portion of the tooling lower die is further provided with a back groove recessed in the surface of the forming portion.

4. A large forging bending tool according to claim 3, characterized in that: The bottoms of both sides of the forming part are symmetrically provided with raised blocks protruding from the sides of the forming part, which are used to increase the stability of the lower die of the tooling.

5. A large forging bending tool according to claim 4, characterized in that: The distance value between each group of lower stops is composed of the width value of the formed blank and the second gap distance value. The second gap distance is the sum of the gap distances between the outer walls on both sides of the pre-formed formed blank between each group of lower stops and the inner sides of the side walls of the corresponding lower stops. The second gap distance value is between 6mm and 10mm.

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