A method for making a blank using a profiled platen

Abstract

The application discloses a method for manufacturing a blank by using a special-shaped beating plate, wherein the special-shaped beating plate is composed of a handle part and a compacting part, and the profile of the special-shaped beating plate is generated according to the profile of a forged piece after final rolling according to the equal volume distribution principle. The blank manufacturing method comprises the following steps: a first beating plate is used to press the outer diameter surface of a blank, and a mandrel is arranged in parallel on the inner diameter surface of the blank and is used to expand the hole of the blank; one end of the blank is raised, a second beating plate is used to press the outer diameter surface of the blank, the mandrel is raised in the opposite direction of the raised end of the blank, and the inner diameter surface of the blank is expanded obliquely; at this time, the forces on the two ends of the blank are different, and the blank presents a shape of a bell mouth; the big end of the bell mouth of the blank is raised, the compacting part of a third beating plate is used to press the outer diameter of the blank, the mandrel still keeps expanding the hole obliquely, and according to the equal volume principle, the outer diameter profile of the blank is a special-shaped surface; and the flat end surface is raised to the required height, and the final rolling is performed. According to the blank manufacturing method and the special-shaped mandrel, the outer diameter surface of the blank mandrel is a special-shaped surface, and the size requirement is met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of a horse-shoe forging, and particularly relates to a method for blanking by using a special-shaped beating plate. BACKGROUND

[0002] For a machine case type forging, the profile is generally divided into a large end and a small end, that is, the radial dimension of the two ends is greatly different, and the profile is trumpet-shaped, as shown in Figure 1 The traditional blanking method is as follows: the blanking is performed by using a slanted horse-shoe, that is, one end of the punched blank is raised to a certain height, and then a flat plate is used to press the outer diameter of the blank, so as to achieve the purpose of making the blank horse-shoe trumpet-shaped, as shown in Figure 2 The disadvantage of the scheme is as follows: after being raised, the blank is pressed by using a flat plate, and the inner and outer diameters of the blank after being horse-shoed are inclined surfaces; in addition, when the flat plate is pressed, the flow of the blank is random. The middle blank horse-shoed by using the method is not matched with the final profile of the forging in the radial and axial blank distribution, which leads to the lack of material in some areas after final rolling, and the machining size requirement is not met.

[0003] A titanium alloy large special-shaped ring forging forming method disclosed in CN104191168A sequentially comprises the steps of heating the titanium alloy bar, upsetting, punching, expanding, and rolling, wherein the expanding step comprises expanding by using an inclined horse-shoe and punch expansion. The titanium alloy large special-shaped ring forging forming method has the following beneficial effects: the ring blank is formed into a taper by using the inclined horse-shoe, the ring blank with a certain taper is expanded by using the punch, and finally the whole formed forging is obtained by rolling, so that the waste of raw materials is reduced, the integrity of the forging is maintained, and good comprehensive performance is maintained during machining. However, the method cannot guarantee that the profile after forging is in an equal-volume distribution, and the final size meets the requirement. SUMMARY

[0004] In order to solve the above problems, the application aims to provide a method for blanking by using a special-shaped beating plate,

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: a special-shaped beating plate is integrally formed by a handle part and a compacting part, the profile of the special-shaped beating plate is generated according to the profile of a forging after final rolling according to the equal-volume distribution principle, three types of special-shaped beating plates are provided for complete use, and the compacting parts of the three types of special-shaped beating plates are respectively a first beating plate with a flat compacting part, a second beating plate with an inclined compacting part, and a third beating plate with a special-shaped compacting part.

[0006] The thickness of the handle part of the third beating plate is less than that of the compacting part.

[0007] The special-shaped surface of the compacting part of the third beating plate is composed of an inclined surface and a horizontal surface, and the thickness of the horizontal surface is greater than the maximum thickness of the inclined surface.

[0008] The horizontal surface and the inclined surface are connected by an inclined surface chamfer.

[0009] The method for manufacturing a special-shaped mandrel by using a special-shaped die plate includes the following steps,

[0010] Step 1: a first die plate is used to press the outer diameter surface of the blank, and a mandrel is arranged in parallel on the inner diameter surface of the blank and is used to expand the hole of the blank;

[0011] Step 2: one end of the blank is raised, a second die plate is used to press the outer diameter surface of the blank, and the mandrel is raised in the opposite direction of the raised end of the blank, and the mandrel is used to expand the hole of the inner diameter surface of the blank in an inclined manner, at this time, the two ends of the blank are subjected to different forces, and the blank presents a shape of a bell mouth;

[0012] Step 3: one end of the bell mouth of the blank is raised, a third die plate is used to press the outer diameter surface of the blank, and the mandrel is still used to expand the hole in an inclined manner, and the outer diameter surface of the blank is obtained according to the principle of equal volume.

[0013] Step 4: the end surface is raised to the required height, and the final rolling is performed.

[0014] In step 1, the compacting surface of the first die plate is a horizontal surface, the first die plate and the mandrel are used to expand the hole of the blank to Φ400-Φ430mm.

[0015] In step 2, the compacting surface of the second die plate is an inclined surface, the mandrel and the blank are raised by 70-100mm in opposite directions, the second die plate and the mandrel are used to expand the hole of the small end to Φ600-Φ650mm and the hole of the large end to Φ970-Φ1020mm.

[0016] In step 3, one end of the large head is raised by 140-180mm, the third die plate and the mandrel are used to expand and shape the hole of the small end of the bell mouth of the blank to Φ710-Φ750mm and the hole of the large end to Φ1030-Φ1080mm.

[0017] Compared with the prior art, the present application has the following advantages: the present application uses a special-shaped die plate to manufacture a special-shaped mandrel, the outer diameter surface of the blank mandrel is a special-shaped surface, and since the surface of the blank after the mandrel is generated according to the surface of the final rolling of the forged piece according to the principle of equal volume, the special-shaped surface obtained after the mandrel is manufactured can ensure that the blank and the rolling die have better matching during the final rolling, the metal flow during rolling is reduced, the blank is basically in bending deformation, and thus the rolling and the final forming of the forged piece are more favorable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The traditional die structure diagram of the die type forging;

[0020] Figure 2 The structure diagram of the traditional horse frame;

[0021] Figure 3 The structure diagram of the special-shaped horse frame in the present application;

[0022] Figure 4 The three-dimensional diagram of the special-shaped hammer in the present application;

[0023] Figure 5 The side view of Figure 4 ;

[0024] Figure 6 The three-dimensional diagram of the special-shaped hammer in the present application;

[0025] Figure 7 Step 1 of the special-shaped hammer blanking method in the present application;

[0026] Figure 8 Step 2 of the special-shaped hammer blanking method in the present application;

[0027] Figure 9 Step 3 of the special-shaped hammer blanking method in the present application;

[0028] In the figure, 1 is a handle part, 2 is a compaction part, 3 is a first hammer, 4 is a blank, 5 is a horse frame, 6 is a second hammer, and 7 is a third hammer. DETAILED DESCRIPTION

[0029] The present application will be further described below in combination with the drawings and specific embodiments, but should not be understood as the scope of the subject matter described in the present application being limited to the following embodiments. Any modification, replacement and change made according to the ordinary technical knowledge and conventional means in the art without departing from the above technical idea of the present application are included in the scope of the present application.

[0030] Referring to Figure 3 , the inner diameter profile of the forging is adjusted to be inclined according to the angle of the horse frame cushioning, and the outer diameter profile of the intermediate blank is obtained according to the principle of equal volume, that is, the special-shaped horse frame profile, as shown in Figure 3 . The special-shaped hammer is designed according to the profile, as shown in Figure 4 and Figure 5The designed special-shaped tapping plate is composed of a handle part 1 and a compacting part 2, the profile of which is generated according to the profile of the forged piece after final rolling in accordance with the equal-volume distribution principle, and three special-shaped tapping plates are provided for use, which are respectively a first tapping plate 3 with a planar compacting part 2, a second tapping plate 6 with an inclined compacting part 2 and a third tapping plate 7 with a special-shaped compacting part 2. The thickness of the handle part 1 of the third tapping plate 7 is less than that of the compacting part 2. The special-shaped profile of the compacting part 2 of the third tapping plate 7 is composed of an inclined surface and a horizontal surface, and the thickness of the horizontal surface is greater than the maximum thickness of the inclined surface. The horizontal surface and the inclined surface are connected through an inclined chamfer

[0031] The special-shaped horse frame blanking steps are as follows,

[0032] Step 1: the first tapping plate 3 is used to expand the hole of the blank 4 to Φ400-Φ430 mm after the piercement of the blank 4;

[0033] Step 2: one end of the blank 4 is raised by 70-100 mm together with the horse lever 5, but the raising directions are opposite, at this time, the blank 4 is in an inclined state, and then the second tapping plate 6 is used to expand the hole of the blank 4 by the horse lever 5. Since there is a difference in force between the two ends of the blank 4 at this time, the blank 4 will present a trumpet mouth shape after the horse frame expansion, the inner hole of the small head end is expanded to Φ600-Φ650 mm, and the inner hole of the big head end is expanded to Φ970-Φ1020 mm;

[0034] Step 3: the big head end of the blank is raised by 140-180 mm, the third tapping plate 7 is used to expand and shape the inner hole of the small head end to Φ710-Φ750 mm, and the inner hole of the big head end to Φ1030-Φ1080 mm.

[0035] Step 4: after the flat end surface is raised to the required height, the final rolling is performed.

[0036] After the blanking of the special-shaped horse frame, the forged piece is formed by the final rolling, the shape and size of which meet the expected requirements. The profile of the blank 4 after the final horse frame expansion is generated according to the profile of the forged piece after the final rolling in accordance with the equal-volume distribution principle, so that the blank and the rolling die have better matching after the blanking, the metal flow in the rolling process is reduced, the blank is basically in bending deformation, and thus the rolling is more beneficial to the die sticking and the final forming of the forged piece.

[0037] The above describes in detail the method for blanking by using the special-shaped tapping plate provided by the present application. The structure and working principle of the present application are described by using specific examples. The above examples are only used to help understand the method and core idea of the present application. It should be pointed out that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A method for blank preparation using an irregularly shaped tamper, characterized in that, This method uses a shaped tamper for billet preparation. The shaped tamper consists of a handle (1) and a compaction part (2) as one piece. Its shape is generated according to the principle of equal volume distribution based on the final rolled shape of the forging. Three types of shaped tamperes are used in a set: a first tamper (3) with a flat compaction part (2), a second tamper (6) with an inclined compaction part (2), and a third tamper (7) with an irregularly shaped compaction part (2). The irregularly shaped compaction part (2) of the third tamper (7) consists of an inclined surface and a horizontal surface. The thickness of the horizontal surface is greater than the maximum thickness of the inclined surface. The horizontal surface and the inclined surface are connected by a chamfer. The billet preparation method includes the following steps. Step 1: Press down on the outer diameter surface of the billet (4) using the first clapper (3), and set the lever (5) parallel to the inner diameter surface of the billet (4) to enlarge the hole; Step 2: Raise one end of the billet (4), press down on the outer diameter surface of the billet (4) with the second clapper (6), raise the billet (4) in the opposite direction of raising the billet (4), and tilt the inner diameter surface of the billet (4) to enlarge the hole. At this time, there is a difference in the force on the two ends of the billet (4), and the billet (4) presents a trumpet shape. Step 3: Raise the large end of the flared mouth of the billet (4), and use the compaction part (2) of the third clapper (7) to press down on the outer diameter of the billet (4). The lever (5) remains inclined to expand the hole. According to the principle of equal volume, the outer diameter surface of the billet (4) is an irregular surface. Step 4: After the end face is flattened to the required height, proceed with final rolling to form the final shape; The first clapper (3) works with the lever (5) to enlarge the hole of the billet (4) to Φ400~Φ430mm. The second clapper (6) works with the lever (5) to enlarge the inner hole of the small end to Φ600~Φ650mm and the inner hole of the large end to Φ970~Φ1020mm. The third clapper (7) works with the lever (5) to enlarge and shape the inner hole of the small end of the billet's flared mouth to Φ710~Φ750mm and the inner hole of the large end to Φ1030~Φ1080mm.

2. The method for blank preparation using an irregularly shaped plate according to claim 1, characterized in that: The thickness of the handle part (1) of the third clapper (7) is less than that of the compaction part (2).

3. The method for blank preparation using an irregularly shaped plate according to claim 1, characterized in that: In step 2, the lever (5) and the billet (4) are raised by 70-100mm to opposite ends.

4. The method for blank preparation using an irregularly shaped plate according to claim 1, characterized in that: In step 3, the larger end is raised by 140-180mm.

Images