Forming process of an inverted T-shaped cross-section high-temperature alloy ring-shaped forging

Abstract

The present application relates to the technical field of forging forming, in particular to a kind of high-temperature alloy annular forging forming process of inverted T-shaped section, according to the size of annular forging, cutting suitable length of bar stock;Blank upset, then using punch to form blank;Using ring rolling machine to be rolled into rectangular section ring piece;Using first tooling to constrain blank to be formed;Using second tooling to constrain ring piece to be formed, the second tooling includes upper end special-shaped pressing plate and lower end special-shaped pressing plate, the upper end special-shaped pressing plate and the lower end special-shaped pressing plate are provided with annular step on end face, ring piece is arranged between upper end special-shaped pressing plate and lower end special-shaped pressing plate, lower end special-shaped pressing plate is pressed, and inverted T-shaped annular forging is formed.The present application increases the preforming process of mould after ring rolling, cancels the cogging, and meets the limit height of ring rolling machine equipment production capacity, then carries out axial end pressure and the restriction of mould cavity, to realize the inside diameter special-shaped forming of ring piece.

Description

Technical Field

[0001] The present invention relates to the technical field of forging and forming, and particularly to a forming process for a superalloy ring forging with an inverted T-shaped cross-section. Background Art

[0002] A certain superalloy ring forging has a height of 30.5 mm, and its cross-section forms an inverted T-shaped "┣". Since the minimum height of the ring forgings rolled by a horizontal ring rolling mill is 50 mm, the height of this superalloy ring forging is less than the minimum rolling height of the horizontal ring rolling mill. The current actual manufacturing method is: forging in the height direction, and after forging, rolling into a ring forging with a rectangular cross-section "口". As a result, two mechanical machinings are required after rolling and forming. During the first mechanical machining, the forged rectangular ring forging is cut in the height direction, and a cutting allowance needs to be reserved. During the second mechanical machining, the cut rectangular cross-section "口" ring forging is machined into an inverted T-shaped "┣" cross-section shape, and the mechanical machining amount is about 22%.

[0003] Therefore, there is currently a need for a technical solution to solve the technical problems that the height of the ring forging cannot reach the minimum height of the rolling equipment, and for a ring forging with an inverted T-shaped cross-section, it is necessary to forge into a ring forging with a rectangular cross-section in the height direction, then cut the forged workpiece by cutting, and then process the rectangular cross-section into an inverted T-shape by mechanical machining, resulting in a large amount of mechanical machining, a long production cycle, low raw material utilization rate, and high product cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a forming process for a superalloy ring forging with an inverted T-shaped cross-section, aiming at the technical problems that the height of the ring forging cannot reach the minimum height of the rolling equipment, and for a ring forging with an inverted T-shaped cross-section, it is necessary to forge into a ring forging with a rectangular cross-section in the height direction, then cut the forged workpiece by cutting, and then process the rectangular cross-section into an inverted T-shape by mechanical machining, resulting in a large amount of mechanical machining, a long production cycle, low raw material utilization rate, and high product cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A forming process for a superalloy ring forging with an inverted T-shaped cross-section includes the following steps:

[0007] S1: Blanking, cutting a bar of appropriate length according to the size of the ring forging;

[0008] S2: Upsetting and punching, upsetting the bar, and then using a punch to punch to form a blank;

[0009] S3: Rolling and forming, using a ring rolling mill to roll the blank into a ring with a rectangular cross-section;

[0010] S4: tire mold pre-forming, using a first tool to constrain the ring piece to upset forming to reduce the height of the ring piece;

[0011] S5: tire mold final forming, using a second tool to constrain the ring piece to tire mold forming, the second tool comprising an upper end special-shaped pressing plate and a lower end special-shaped pressing plate, the upper end special-shaped pressing plate and the lower end special-shaped pressing plate are both provided with an annular step, the ring piece is arranged between the upper end special-shaped pressing plate and the lower end special-shaped pressing plate, the upper end special-shaped pressing plate is pressed down, and the rectangular cross-section ring piece forms an inverted T-shaped annular forging.

[0012] The present application discloses a kind of inverted T-shaped section high-temperature alloy annular forging forming process, cutting single annular forging required bar, the height of blank in upsetting process is controlled above the minimum height of ring rolling machine, so that single blank is conveniently processed into ring piece on ring rolling machine, then the height of ring piece is compressed to close to final size using tire mold pre-forming step, finally, in the process of tire mold final forming, using upper end special-shaped pressing plate and lower end special-shaped pressing plate to form protrusion on inner wall of ring piece while compressing ring piece, inverted T-shaped annular forging is processed;The present application controls upsetting height, so that single blank can be rolled on ring rolling machine, and after rolling process, tire mold pre-forming is added, the height of ring piece is compressed, so that workpiece can be rolled on ring rolling machine without being forged, cutting processing is reduced, and in the process of tire mold final forming, ring piece is constrained to tire mold forming by pressing plate conforming to the shape of inner wall of workpiece, so that T-shaped annular forging is processed to conform to height.

[0013] As a preferred scheme of the present application, the first tool comprises a lower end pressing plate and an upper end pressing plate, and the ring piece is arranged between the lower end pressing plate and the upper end pressing plate. The upper end pressing plate and the lower end pressing plate have flat end faces, and the ring piece is arranged between the two pressing plates for upsetting forming, so as to reduce the height of the ring piece to close to the final height size.

[0014] As a preferred scheme of the present application, steps S4 and S5 are both performed in a sleeve, and the inner diameter of the sleeve is matched with the outer diameter of the annular forging. The inner diameter of the sleeve is matched with the outer diameter of the final shape of the annular forging, so that the sleeve limits the ring piece inside during tire mold forming, improves the stability of the tire mold forming process, and improves the forming precision of the annular forging.

[0015] As a preferred scheme of the present application, in step S1, after blanking, the two ends of the bar are chamfered. The chamfering avoids cracks, folds and other defects caused by sharp corners of the bar end face during forming.

[0016] As a preferred scheme of the present application, after chamfering the bar, glass lubricant GZH-3 is uniformly applied to the surface of the bar, and the application thickness is 0.5 mm to 1.5 mm.

[0017] As a preferred scheme of the present application, in the step S2, the blank height is controlled to be H=60±3mm. The blank height is allowed to be higher than the minimum height of the rolled workpiece on the ring rolling machine, so that the blank can be rolled on the ring rolling machine, while the height is controlled within a certain range, the height to be compressed during rolling is reduced, the stability of the rolling process is improved, and the rolling quality is improved.

[0018] As a preferred scheme of the present application, the step S3 includes primary pre-rolling, secondary pre-rolling and final rolling. The blank is rolled in steps, so that the deformation amount of the blank during single rolling is reduced, and the rolling forming precision is improved.

[0019] As a preferred scheme of the present application, in the primary pre-rolling, the ring height is controlled to be 52±3mm. The ring is axially limited, so that the height of the ring gradually approaches the limit height of the equipment during rolling, while the first pre-rolled ring height is controlled to be 52±3mm, the compression length of the ring height is reduced, and the stability during the first pre-rolling is improved.

[0020] As a preferred scheme of the present application, in the secondary pre-rolling, the ring height is controlled to be 50±3mm. The ring height is controlled to be on the limit height of the ring rolling machine, so that the compression height of the ring during the tire mold pre-forming and the tire membrane final forming processes is reduced, and the processing difficulty is reduced.

[0021] As a preferred scheme of the present application, in the step S4, the ring height is controlled to be H=35±1mm. The ring with a high height size after being processed by the ring rolling machine is compressed to be close to the final height size by adding the tire mold pre-forming step, so that the annular forging with the final height size is obtained after the tire mold final forming.

[0022] In summary, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0023] 1. The present application adds a tire mold pre-forming process after ring rolling, cancels the cogging, and meets the limit height of the ring rolling machine production capacity;

[0024] 2. The outer diameter of the ring is controlled during the tire mold final forming, and the axial end pressure and the mold cavity are limited, so that the inner diameter is formed, and the inverted T-shaped cross-section special-shaped annular forging is manufactured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the annular forging according to the present application;

[0026] Figure 2 is a machining diagram of the tire mold pre-forming according to the present application;

[0027] Figure 3 is a machining diagram of the tire mold final forming according to the present application;

[0028] The markings in the diagram are: 1-ring forging, 11-protrusion, 2-ring, 3-upper pressure plate, 4-lower pressure plate, 5-sleeve, 6-upper irregular pressure plate, 61-ring step, 7-lower irregular pressure plate. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] Example 1

[0032] like Figure 1 As shown, the annular forging 1 to be processed by this method has protrusions on its inner wall and an inverted T-shaped cross-section. For this annular forging 1, the following process method is adopted in this embodiment, with the specific steps as follows:

[0033] 1) Blanking: According to the forming rules and volume requirements of the ring forging 1, the raw material is sawn into suitable bars. The blanking size of the product involved in this invention patent is Φ200mm×103±3mm, and the blanking weight of a single piece is 26.7Kg.

[0034] 2) Chamfering: Chamfer both ends of the bar stock with a radius of R10mm to R20mm to avoid defects such as cracks and folds caused by sharp corners during the forming process.

[0035] 3) Coating: Apply glass lubricant GZH-3 evenly to the surface of the bar stock, with a coating thickness of 0.5mm to 1.5mm.

[0036] 4) Heating: Use a box-type resistance furnace to heat the bar stock at a temperature of 1000℃~1100℃ and a holding time of 120min~210min.

[0037] 5) Upsetting and punching: Upset the bar stock to H=60±3mm to form a billet. The upsetting speed is ≤15mm / s. Then, use a Φ100mm punch to punch holes. The thickness of the punching plate is 25mm~30mm.

[0038] 6) Coating: Apply glass lubricant GZH-3 evenly to the surface of the blank, with a coating thickness of 0.5mm to 1.5mm.

[0039] 7) Heating the billet: Use a box-type resistance furnace to heat the billet at a temperature of 1000℃~1100℃ and a holding time of 90min~180min.

[0040] 8) First pre-rolling, using ring rolling machine to roll the blank into Φ337±5mm×Φ200±5mm×52±3mm, strictly controlling the height dimension of the ring blank 52±3mm.

[0041] 9) Coating, uniformly coating glass lubricant GZH-3 on the surface of the blank, coating thickness 0.5mm-1.5mm;

[0042] 10) Blank heating, using box-type resistance furnace to heat the blank, heating temperature 1000-1100℃, holding time 80-160min.

[0043] 11) Second pre-rolling, using ring rolling machine to roll the blank into Φ550±5mm×Φ476±5mm×50±3mm, strictly controlling the height dimension of the ring blank 50±3mm.

[0044] 12) Coating, uniformly coating glass lubricant GZH-3 on the surface of the blank, coating thickness 0.5mm-1.5mm.

[0045] 13) Blank heating, using box-type resistance furnace to heat the blank, heating temperature 1000-1100℃, holding time 70-150min.

[0046] 14) Final rolling, using ring rolling machine to roll the blank into Φ860±2mm×Φ816±5mm×50±3mm, forming the ring piece 2, strictly controlling the outer diameter dimension of the ring piece Φ860±2mm and the height dimension 50±3mm.

[0047] 15) Ring piece 2 heating, using box-type resistance furnace to heat the ring piece 2, heating temperature 1000-1100℃, holding time 70-150min.

[0048] 16) Tire mold pre-forming, using the mold shown in Figure 2 to constrain the upsetting forming of the ring piece 2, strictly controlling the height dimension of the ring blank 35±1mm, ensuring that the outer diameter and the outer diameter end face of the ring blank have no lack-of-material defects;

[0049] Specifically, the first tooling includes a lower end plate 4 and an upper end plate 3, the lower end plate 4 is arranged in the sleeve 5, the ring piece 2 is arranged between the lower end plate 4 and the upper end plate 3, the ring piece 2 is placed between the upper end plate 3 and the lower end plate 4 for upsetting forming, the height of the ring piece 2 is reduced, and the height of the ring piece 2 approaches the final height dimension.

[0050] 17) Ring piece 2 heating, using box-type resistance furnace to heat the ring piece 2, heating temperature 1000-1100℃, holding time 60-120min.

[0051] 18) the final forming of the tire mold, using Figure 3 the mold shown in the figure, the ring piece 2 is constrained to form the tire mold, and the annular forging 1 is formed, the cross-sectional shape is as shown in the figure Figure 1 , ensuring that the annular forging 1 end face has no folding, the inner diameter effective size is not greater than Φ766mm, and the outer diameter and outer diameter end face have no lack of meat defects;

[0052] Specifically: using a second tool to constrain the tire mold forming of the ring piece 2, the second tool includes an upper end special-shaped pressing plate 6 and a lower end special-shaped pressing plate 7, the upper end special-shaped pressing plate 6 and the lower end special-shaped pressing plate 7 are both provided with an annular step 61 on the end face, the lower end special-shaped pressing plate 7 is arranged in the sleeve 5, the ring piece 2 is arranged between the upper end special-shaped pressing plate 6 and the lower end special-shaped pressing plate 7, and the upper end special-shaped pressing plate 6 is pressed downward, so that the rectangular cross-section ring piece 2 forms an inverted T-shaped annular forging 1.

[0053] The present application increases the tire mold preforming process after ring rolling, on the one hand, cancels the cogging, and meets the production capacity limit height of the ring rolling machine equipment; on the other hand, by controlling the outer diameter of the ring piece 2 during the final forming of the tire mold, and performing axial end pressure and mold cavity restriction, the inner diameter is formed, and the inverted T-shaped “┣” cross-section special-shaped annular forging 1 is manufactured.

[0054] After process optimization, the high-temperature alloy annular forging avoids the reservation of the notch, and also avoids about 22% of the mechanical processing amount from the rectangular cross-section “□” annular forging to the inverted T-shaped “┣” cross-section shape, the production cycle is shortened by more than 10%, the single piece forging raw material demand is reduced by more than 35%, and the manufacturing cost is reduced by more than 25%

[0055] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A forming process for a high-temperature alloy ring forging with an inverted T-shaped cross-section, characterized in that, Includes the following steps: S1: Cutting the bar stock to the appropriate length according to the size of the ring forging (1); Heating: The bar stock is heated using a box-type resistance furnace at a temperature of 1000℃~1100℃ and a holding time of 120min~210min. S2: Upsetting and punching. The bar stock is upset and then punched with a punch to form a billet. The billet height is controlled at H=60±3mm. The billet is heated using a box-type resistance furnace at a temperature of 1000℃~1100℃ for a holding time of 90min~180min. S3: Rolling and forming, using a ring rolling mill to roll the billet into a ring (2) with a rectangular cross section, including a first pre-rolling, a second pre-rolling and a final rolling. In the first pre-rolling, the height of the ring (2) is controlled at 52±3mm. In the second pre-rolling, the height of the ring (2) is controlled at 50±3mm. The billet is heated between the second pre-rolling and the final rolling. A box-type resistance furnace is used to heat the billet at a temperature of 1000℃~1100℃ and a holding time of 70min~150min. After the final rolling is completed, the ring is heated. The ring (2) is heated in a box-type resistance furnace at a temperature of 1000℃~1100℃ and a holding time of 70min~150min. S4: Pre-forming of the mold, using the first tooling to constrain and upset the ring (2) to reduce the height of the ring (2). The first tooling includes a lower pressure plate (4) and an upper pressure plate (3). The ring (2) is set between the lower pressure plate (4) and the upper pressure plate (3). The height of the ring (2) is controlled at H=35±1mm. Heating of ring (2): Ring (2) is heated using a box-type resistance furnace at a temperature of 1000℃~1100℃ and a holding time of 60min~120min. S5: The mold is finally formed. The second tooling is used to constrain the ring part and form the mold. The second tooling includes an upper irregular pressure plate (6) and a lower irregular pressure plate (7). The end faces of the upper irregular pressure plate (6) and the lower irregular pressure plate (7) are provided with annular steps (61). The ring part (2) is placed between the upper irregular pressure plate (6) and the lower irregular pressure plate (7). The upper irregular pressure plate (6) is pressed down to form an inverted T-shaped ring forging (1) of the rectangular cross section ring part (2).

2. The forming process for the inverted T-shaped cross-section high-temperature alloy ring forging according to claim 1, characterized in that, Steps S4 and S5 are both performed inside the sleeve (5), and the inner diameter of the sleeve (5) is adapted to the outer diameter of the annular forging (1).

3. The forming process for inverted T-shaped cross-section high-temperature alloy ring forgings according to claim 1, characterized in that, In step S1, after the material is cut, the two ends of the bar stock are chamfered.

4. The forming process for the inverted T-shaped cross-section high-temperature alloy ring forging according to claim 1, characterized in that, After the bar stock is chamfered, glass lubricant GZH-3 is evenly applied to the surface of the bar stock, with a coating thickness of 0.5mm to 1.5mm.

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