A rudder root frame longitudinal forging and transverse forming tool and forming process

Abstract

The present invention relates to the field of forging and forming, and discloses a tool and forming process for the longitudinal forging and transverse forming of a rudder root skeleton. The manufacturing process consists of three parts: tool planning, design and manufacturing, and transverse forming. The tool can expand the length of the transverse inner gap through vertical force processing without directly applying forging force, and the structure of the formed part will not be damaged.

Description

Technical Field

[0001] The invention relates to the field of forging and forming, and in particular to a longitudinal forging and transverse forming tool and a forming process for a rudder root skeleton. Background Art

[0002] The rudder root frame is an important protective part of the rocket launcher flight wing. Its maximum length is 245mm, width is 98mm, thickness is 30mm, and the minimum inner diameter is 9.57mm (see attached Figure 1 ), an inner notch 101 with a length of 68mm is provided in the middle of the upper end, a positioning section 103 with a specific length is on the right side of the inner notch 101, and a connecting section 102 is on the left side of the inner notch 101. The rudder root skeleton is forged from TA15 titanium alloy bars, but the inner size of the forging is determined to be 57mm due to the forging process design. After 400 pieces have been forged, it was found that the 57mm size cannot meet the 68mm size requirement for processing into parts. This batch of 400 semi-finished forgings has consumed a lot of materials, labor and time. If they cannot be salvaged and processed into parts, the material cost will be lost by nearly 500,000 yuan and the sales volume will be 5 million yuan. If this batch of semi-finished forgings is discarded and re-cut and molded for production, additional mold processing costs and mold processing cycles are required, which increases costs and affects the delivery schedule of the products. There is an urgent need for a technology that can process this batch of semi-finished forgings, expand the length of the transverse inner notch without directly applying forging force, and without damaging the structure of the formed part, so as to ultimately meet the part size requirements. Summary of the Invention

[0003] The present invention aims to provide a rudder root skeleton longitudinal forging and transverse forming tooling, which can process the batch of semi-finished forgings, expand the transverse inner gap length without directly applying forging force, and without damaging the structure of the formed part.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tool for longitudinal forging and transverse forming of a rudder root skeleton, comprising a base and a pressing block, a slot is provided in the middle of the base, the shape and size of the inner cavity of the slot are the same as the outer dimensions of the connecting section of the semi-finished forging, and the depth of the slot is less than the length of the connecting section of the semi-finished forging; a pressing groove is provided at the side end of the pressing block, and the pressing block below the pressing groove can be inserted into the inner notch of the semi-finished forging and can move along the length direction of the inner notch.

[0005] Preferably, as an improvement, handles are welded to the side ends of the pressing block and the base.

[0006] Preferably, as an improvement, the pressing block is a rectangular block, and the pressing grooves are provided on both the left and right sides of the pressing block.

[0007] Preferably, as an improvement, a gap is left between the pressing block and the semi-finished forging in the forging state, but the pressing block located below the pressing groove is in contact with the inner notch of the semi-finished forging.

[0008] Preferably, as an improvement, the size of the slot is based on the size of the connecting section of the semi-finished forging plus a 0.6% thermal shrinkage allowance.

[0009] The principle and advantages of this solution are as follows: In practical application, the base and pressure block cooperate to achieve a processing method that indirectly applies longitudinal force, thereby increasing the length of the transverse inner gap without directly applying forging force. By ensuring that the pressure block only contacts the inner gap but is not subject to force, deformation of the forging is avoided, damage to the already formed structure is not damaged, and ultimately, part dimensional requirements are met. The pressure block is slotted on both sides, reducing weight and facilitating operation, while allowing both sides to be used for processing.

[0010] The present invention further provides a rudder root frame longitudinal forging and transverse forming process using the above-mentioned rudder root frame longitudinal forging and transverse forming tooling, comprising the following steps:

[0011] A. Tooling production: a tooling for longitudinal forging and transverse forming of the rudder root frame is produced;

[0012] B. Die trimming: trimming the forging die for processing semi-finished forgings to the preset size;

[0013] C. Upsetting of semi-finished forgings: using the rudder root skeleton longitudinal forging and transverse forming tooling on the press to upset the connecting section of the heated semi-finished forgings, enlarge the length of the inner notch of the semi-finished forgings, and then use the trimmed forging die on the press to correct the shape of the forgings;

[0014] D. Finishing: Machining the formed forgings to part size.

[0015] Preferably, as an improvement, the processing of the base slot in step A adds a 0.6% heat shrinkage allowance based on the size of the formed forging.

[0016] Preferably, as an improvement, in step C, after the semi-finished forging is heated to 900°C, the connecting section is vertically inserted into the slot on the base, the pressing block is horizontally clamped on the semi-finished forging, the positioning section of the semi-finished forging extends into the rectangular pressing groove, the pressing block below the rectangular pressing groove is horizontally inserted into the inner notch of the semi-finished forging, and the 3150KN press is started to apply downward pressure to the pressing block to partially upset the connecting section of the semi-finished forging downward.

[0017] Preferably, as an improvement, immediately after upsetting in step C, the semi-finished forging is shaped on a 16000KN double-disc friction press using a trimmed forging die, and then air-cooled to obtain a finished forging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the rudder root skeleton parts.

[0019] Figure 2 This is a schematic structural diagram of the base in Example 1 of the present invention.

[0020] Figure 3 This is a schematic structural diagram of the briquette in Example 1 of the present invention.

[0021] Figure 4 This is a structural schematic diagram of the semi-finished forging in the upsetting state in Example 2 of the present invention. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The reference numerals in the drawings of the specification include: semi-finished forging 1, base 2, stepped slot 21, pressing block 3, rectangular pressing groove 31, handle 5, inner stop notch 101, connecting section 102, and positioning section 103.

[0024] Example 1, basically as in the attached Figure 2 、 Figure 3 The figure shows a tool for longitudinally forging and transversely forming a rudder root frame. It includes a base 2 and a pressure block 3. A stepped slot 21 is machined into the center of the base 2. The inner contour of the stepped slot 21 is identical to the outer contour of the connecting section 102 on the left side of the semi-finished forging 1. The depth of the stepped slot 21 is less than the length of the connecting section 102 of the semi-finished forging 1. The dimensions of the stepped slot 21 are based on the dimensions of the connecting section 102 of the semi-finished forging 1, with an additional 0.6% thermal shrinkage allowance. The pressure block 3 is rectangular in shape, with rectangular grooves 31 machined into the center of both the front and rear sides. The vertical length of the rectangular grooves 31 is greater than the length of the positioning section 103 of the semi-finished forging 1. The height of the pressure block 3 below the rectangular grooves 31 is less than the length of the inner stop notch 101 of the semi-finished forging 1. Handles 5 are welded to the side ends of the base 2 and pressure block 3.

[0025] Example 2, a rudder root skeleton longitudinal forging and transverse forming process, including tooling production, die trimming, semi-finished forging 1 roughing, and finishing steps.

[0026] For tooling, waste 5CrNiMo modules from the production site were used and sawn into base 2 blanks and briquette 3 blanks. The base 2 and briquette 3 were processed and formed according to the structure of Example 1. The hardness was checked to be HRC 42-48. The processed base 2 was placed on the workbench of a 3150KN press.

[0027] The die is trimmed to trim the forging die for processing the semi-finished forging 1, and the size of the corresponding inner gap 101 on the forging die is processed from 57 mm to 60.5 mm to the left, and polished and smoothly transitioned.

[0028] The semi-finished forging is upsetting, and the semi-finished forging 1 is heated to 900°C, as Figure 4 As shown, the heated semi-finished forging 1 is vertically inserted into the base 2 on the 3150KN press. The connecting section 102 on the left side of the semi-finished forging 1 is inserted into the stepped slot 21 on the base 2. The pressing block 3 is clamped horizontally on the semi-finished forging 1. The positioning section 103 of the semi-finished forging 1 extends into the rectangular pressing groove 31. The pressing block 3 below the rectangular pressing groove 31 is inserted horizontally into the inner gap 101 of the semi-finished forging 1, making contact with the inner gap 101 but not subject to lateral force. A gap is left between the remaining part of the pressing block 3 and the semi-finished forging 1. The 3150KN press is started to apply downward pressure to the pressing block 3, partially upsetting the connecting section 102 of the semi-finished forging 1 downward, forcing the metal in this portion to flow downward and fill the stepped slot 21 of the base 2, so that the inner gap 101 reaches a size of 60.5mm. Immediately after upsetting, the semi-finished forging 1 was shaped using the trimmed forging die on a 16000KN double-disc friction press and air-cooled to obtain a finished forging.

[0029] Finishing: The finished forging is machined according to the part size to obtain a rudder root skeleton part with an inner notch 101 length of 68 mm.

[0030] Using the technical solution of the present invention, the blank is φ70×130, weighing 2.25kg. Adding material losses such as material head, saw seams, and test material, the material consumption is 2.25×1.15=2.60kg. The ex-factory price is 450 yuan / kg, and the sales volume is 4,500 yuan / kg. The material loss of 400 pieces is recovered: 2.6kg×450 yuan / kg×400 pieces=468,000 yuan, and the sales revenue is recovered: 2.6kg×4,500 yuan / kg×400 pieces=4.68 million yuan. By designing and manufacturing dedicated tooling, the stepped slot 21 of the base 2 is given a 0.6% thermal shrinkage allowance based on the forging dimensions, ensuring that the final forging dimensions meet the process requirements. The combination of the base 2 and the pressing block 3 achieves a longitudinal indirect force processing method, expanding the length of the transverse inner notch 101 without directly applying forging force. By ensuring that the pressing block 3 only contacts the inner notch 101 but is not subjected to force, deformation of the forging is avoided, the structure of the formed portion is not damaged, and the part size requirements are ultimately met. The pressing block 3 is grooved on both sides to reduce weight, facilitate operation, and both sides can be used for processing.

[0031] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A rudder root frame longitudinal forging and transverse forming process, characterized by: The following steps are involved: A. Tooling production: A tooling for longitudinal forging and transverse forming of a rudder root skeleton is produced. The tooling comprises a base and a pressing block. A slot is provided in the middle of the base. The shape and dimensions of the inner cavity of the slot are the same as the outer dimensions of the connecting section of the semi-finished forging, and the depth of the slot is less than the length of the connecting section of the semi-finished forging. A pressing groove is provided on the side end of the pressing block. The pressing block below the pressing groove can be inserted into the inner notch of the semi-finished forging and can move along the length direction of the inner notch. The pressing block is a rectangular block, and the pressing groove is provided on both the left and right ends of the pressing block. In the forging state, a gap is left between the pressing block and the semi-finished forging, but the pressing block below the pressing groove contacts the inner notch of the semi-finished forging. B. Die trimming: trimming the forging die for processing semi-finished forgings to the preset size; C. Upsetting of semi-finished forgings: using the rudder root skeleton longitudinal forging and transverse forming tooling on the press to upset the connecting section of the heated semi-finished forgings, enlarge the length of the inner notch of the semi-finished forgings, and then use the trimmed forging die on the press to correct the shape of the forgings; D. Finishing: Machining the formed forgings to part size.

2. The rudder root frame longitudinal forging and transverse forming process according to claim 1 is characterized by: The side ends of the pressing block and the base are both welded with handles.

3. The rudder root frame longitudinal forging and transverse forming process according to claim 1, characterized in that: The size of the slot is based on the size of the connecting section of the semi-finished forging plus 0.6% thermal shrinkage.

4. The rudder root frame longitudinal forging and transverse forming process according to claim 3, characterized in that: The processing of the base slot in step A is performed with a heat shrinkage allowance of 0.6% based on the size of the formed forging.

5. The rudder root skeleton longitudinal forging and transverse forming process according to claim 4 is characterized in that: In step C, after the semi-finished forging is heated to 900° C., the connecting section is vertically inserted into the slot on the base, the pressing block is horizontally clamped on the semi-finished forging, the positioning section of the semi-finished forging extends into the rectangular pressing groove, and the pressing block below the rectangular pressing groove is horizontally inserted into the inner notch of the semi-finished forging. The 3150KN press is started to apply downward pressure to the pressing block, thereby partially upsetting the connecting section of the semi-finished forging downward.

6. The longitudinal forging and transverse forming process of the rudder root skeleton according to claim 5 is characterized in that: Immediately after upsetting in step C, the semi-finished forging is shaped on a 16000KN double-disc friction press using a trimmed forging die, and then air-cooled to obtain a finished forging.

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