Forging method of non-concentric step type rough mold

Abstract

The invention belongs to the field of forging, and particularly relates to a forging method for a non-concentric step type rough mold. Comprising the following steps: 1, determining a rough pattern according to a die forging; 2, a bar is selected according to the rough pattern and processed to be made into a blank; 3, one end face of the bar or the blank is attached to one side of the V-shaped forming die through the V-shaped forming die, the side edge of the bar or the blank is attached to the other side of the V-shaped forming die, and one corner of the bar or the blank is upset; step 4, determining a molding bed according to the rough shape graph; 5, the flat end face of the blank placed on the side, not extruded, of the lower end in the step 3 is placed at the lower end of the forming die, and the blank on the side, extruded by the upper hammer anvil, of the succulent part is placed on the eccentric side of the forming die; and 6, the blank is forged in the forming tire mold, and the blank flows downwards and towards the left side and the right side under the action of the upper hammer anvil to form a rough mold.

Description

Technical Field

[0001] The invention belongs to the field of forging, and in particular relates to a forging method for non-concentric step-type rough shapes. Background Art

[0002] For rough forgings with steps and two sections with eccentric axes, the rough shape and size directly affect the die forging process, and the size of the forging is also crucial. In actual production, these rough forgings are typically formed by drawing, and the size is controlled by the operator's experience, which is difficult to operate and results in poor dimensional consistency. Summary of the Invention

[0003] Purpose of the invention: To provide a forging method for non-concentric step-type blanks, effectively ensure the consistency of the blank sizes produced and improve product quality.

[0004] Technical solution: A forging method for a non-concentric step-type rough shape, comprising: Step 1: Determine the rough shape drawing based on the die forging. The rough shape includes a head with a large cross-section and a rod with a small cross-section. The axis of the head and the axis of the rod are not in the same straight line. The deviation value between the axis of the head and the axis of the rod is m. The head is divided into an asymmetrical first part and a second part relative to the axis of the rod. The volume of the first part is larger than that of the second part. The volume difference between the first part and the second part is △t. Step 2: Select the bar material according to the rough drawing and process the bar material to make the blank; Step 3: Using a V-shaped mold, place one end of the bar or blank against one side of the V-shaped mold, and the side of the bar or blank against the other side of the V-shaped mold. Upset one corner of the bar or blank to allow the bar or blank to flow to the other side. Step 4: Determine the forming mold according to the rough shape drawing. The upper part of the mold corresponds to the rough shape head, and the lower part of the mold corresponds to the rough shape rod. The deviation value of the cross-sectional axis between the upper and lower parts of the mold is m; Step 5: Place the flat end surface of the blank placed on the lower end of the non-extruded side in step 3 on the lower end of the forming mold, and place the blank on the fleshy side squeezed by the upper hammer anvil on the eccentric side of the forming mold; Step 6: Forge the blank in the forming membrane. Under the action of the upper hammer anvil, the blank flows downward and to the left and right sides to form a rough shape.

[0005] Preferably, in step 2, if the rough rod portion has a circular cross-section, a bar is selected and step 3 is directly performed; if the rough rod portion has a rectangular cross-section, the bar is first forged to obtain a blank, and then step 3 is performed.

[0006] Preferably, in step 3, the pressed volume t of the corner of the bar or billet in contact with the anvil is controlled during the material division process, wherein t≈ 1 / 2Δt. Preferably, in step 4, the transition fillet R+ at the connection between the head cavity and the stem cavity corresponding to the first part of the molded membrane is greater than the transition fillet R at the connection between the head cavity and the stem cavity corresponding to the second part.

[0007] Preferably, in step 4, the outer contour of the head cavity of the molded fetal membrane is greater than the product of the outer contour of the rough head and the thermal shrinkage coefficient.

[0008] Preferably, in step 4, the size of the stem cavity of the molded membrane is equal to the size of the rough-type stem multiplied by the thermal contraction coefficient.

[0009] Preferably, in step 4, the lower end of the head cavity of the molding mold is chamfered.

[0010] Preferably, the bottom of the rod cavity of the forming mold is a right angle.

[0011] Beneficial effects: By rationally dividing the material through the V-groove, the material on one side of the blank is larger than the other. A well-designed forming die is designed, with the upper and lower parts of the die not centered. At the same time, the radius R+ of the eccentric side of the die is larger than the radius R of the rest of the die. This method is simple to operate, fast in production, and ensures the accuracy and consistency of the blank dimensions, thereby improving the qualified rate of forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a wild type picture; Figure 2 This is a V-shaped tire mold diagram; Figure 3 This is a diagram of the molding mold. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0014] In the description of the present invention, it should be understood that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0015] The present invention adopts a tire mold to perform production through upsetting and forming, and rationally designs the tire mold, which can effectively ensure dimensional consistency and improve product quality.

[0016] A forging method for a non-concentric step-type rough shape, specifically comprising: Step 1: Design the rough shape drawing according to the characteristics of the die forging, such as Figure 1 This type of rough shape consists of two parts, one part has a large cross-section, referred to as the head, as shown in the T area, and the other part has a small cross-section, referred to as the rod, as shown in the G area. The axis of the head and the axis of the rod are not on the same straight line, referred to as non-concentricity, and there is a deviation. The deviation value between the axes is m. The head is divided into an asymmetric first part and a second part relative to the axis of the rod, where the volume of the first part is greater than that of the second part, and the volume difference between the first part and the second part is △t.

[0017] Step 2: If the rough G area (i.e. the rod) has a circular cross-section, select the bar and proceed directly to step 3. If the rough G area (i.e. the rod) has a rectangular cross-section, first forge the bar to obtain a blank, and the size is controlled according to the rough requirement a×b.

[0018] Step 3: Use a V-shaped die to place one end of the bar or blank against one side of the V-shaped die, and the side of the bar (or one side of the blank) against the other side of the V-shaped die. Upset one corner of the bar or blank and allow it to flow to the other side. That is, the bar or blank in contact with the upper anvil is squeezed by the anvil, and the blank flows toward the arrow in the figure, which plays a role in reasonable material distribution. Figure 2 The volume of the bar or blank pressed down at the corner in contact with the anvil is t≈ 1 / 2△t.

[0019] Step 4: Design the mold according to the rough drawing requirements, see Figure 3 The upper part of the mold (corresponding to the rough type T area) and the lower part of the mold (corresponding to the rough type G area) are not in the same straight line with the center of the upper and lower cross-sectional axes of the mold. The difference value is consistent with the rough type requirement of m. In order to ensure the fluidity of the blank and the good formability of the subsequent rough type die forging, the transition fillet R+ at the connection between the first part and the rod is greater than the transition fillet R at the connection between the second part and the rod.

[0020] Step 5: Place one flat end of the blank (i.e. the side that is not squeezed at the bottom in step 3) on the bottom of the forming mold, and place the blank on the side squeezed by the upper hammer anvil on the eccentric side of the forming mold, as shown in the figure. Figure 3 Left side.

[0021] Step 6: Under the action of the upper hammer anvil, the blank flows downward and to the left and right sides. Due to the reasonable material distribution in step 3, the blank flows to the left side more than to the right side, and finally the forming of the non-concentric step shaft type is completed.

[0022] The present invention is further described in detail below through specific implementation examples: This non-concentric step-shaped blank is made of 23Co14Ni12Cr3MoE. The eccentricity between the head and the shank is 10±2mm, and both the head and shank have rectangular cross-sections. The blank is forged in one heat. The eccentricity between the head and shank, as well as the cross-sectional dimensions, are crucial and directly impact the subsequent die forging yield. This blank is produced using this invention.

[0023] Step 1: Design the rough size according to the shape and size of the die forging. The rough size is designed to be an eccentric step-like shape, and the rough head and rod are both rectangular in cross section.

[0024] Step 2: Select the bar specifications and length dimensions, and forge the bar cross-section into a flat square (i.e. rectangular cross-section).

[0025] Step 3: Place the blank into the V-shaped groove and forge one corner of the blank. After calculating the pressed volume t and △t, the pressed amount of the rough edge is about 20mm; Step 4: Place the rough shape in step 3 into a special forming mold, and place the blank on the fleshy side squeezed by the upper hammer anvil on the eccentric side.

[0026] Step 5: Under the forging pressure of the upper hammer anvil, the blank is formed.

[0027] The rough shape forged by the present invention has rough shape size and non-concentricity that meet the design requirements. After die forging, the burrs of the forging are evenly distributed, and the rounded corners on the eccentric side of the rough shape head are 15 mm larger than those on the other parts. No pinching occurs at this part of the forging, and the forgings are 100% qualified.

[0028] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A forging method for non-concentric step-type rough shapes, characterized in that: include: Step 1: Determine the rough shape drawing based on the die forging. The rough shape includes a head with a large cross-section and a rod with a small cross-section. The axis of the head and the axis of the rod are not in the same straight line. The deviation value between the axis of the head and the axis of the rod is m. The head is divided into an asymmetrical first part and a second part relative to the axis of the rod. The volume of the first part is larger than that of the second part. The volume difference between the first part and the second part is △t. Step 2: Select the bar material according to the rough drawing and process the bar material to make the blank; Step 3: Using a V-shaped mold, place one end of the bar or blank against one side of the V-shaped mold, and the side of the bar or blank against the other side of the V-shaped mold. Upset one corner of the bar or blank to allow the bar or blank to flow to the other side. Step 4: Determine the forming mold according to the rough shape drawing. The upper part of the mold corresponds to the rough shape head, and the lower part of the mold corresponds to the rough shape rod. The deviation value of the cross-sectional axis between the upper and lower parts of the mold is m; Step 5: Place the flat end surface of the blank placed on the lower end of the non-extruded side in step 3 on the lower end of the forming mold, and place the blank on the fleshy side squeezed by the upper hammer anvil on the eccentric side of the forming mold; Step 6: Forge the blank in the forming membrane. Under the action of the upper hammer anvil, the blank flows downward and to the left and right sides to form a rough shape.

2. The method according to claim 1, characterized in that In step 2, if the rough rod has a circular cross-section, select the bar and proceed directly to step 3. If the rough rod has a rectangular cross-section, first forge the bar to obtain a blank and then proceed to step 3.

3. The method according to claim 2, characterized in that In step 3, the volume t of the bar or blank that is in contact with the anvil is controlled during the material separation process, where t≈ 1 / 2△t.

4. The method according to claim 3, characterized in that In step 4, the transition fillet R+ at the connection between the head cavity and the stem cavity corresponding to the first part of the molded membrane is greater than the transition fillet R at the connection between the head cavity and the stem cavity corresponding to the second part.

5. The method according to claim 4, characterized in that In step 4, the outer contour of the head cavity of the molded fetal membrane is greater than the product of the outer contour of the rough head and the thermal contraction coefficient.

6. The method according to claim 5, characterized in that In step 4, the size of the rod cavity of the molded membrane is equal to the size of the rough rod multiplied by the thermal contraction coefficient.

7. The method according to claim 6, characterized in that In step 4, the lower end of the head cavity of the molding mold is chamfered.

8. The method according to claim 7, characterized in that In step 4, the bottom of the rod cavity of the molding mold is a right angle.

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