Right angle crack resistant forging lower die

Abstract

The utility model relates to a right angle anti -cracking forging lower mould, including lower mould bottom plate, lower mould plate, lower mould plate is equipped with the forming hole, lower mould plate is equipped with the transition inlay, transition inlay one side is the transition wall, transition wall, curved wall and big straight wall enclose the forming hole, the draft angle of hole wall is 1.5, the included angle angle bisector of big straight wall and transition wall is located in the splicing surface of transition inlay and big straight wall, the included angle angle bisector of curved wall and transition wall is located in the splicing surface of transition inlay and curved wall, lower mould plate is equipped with the guide column guide hole, lower mould plate is equipped with the positioning hole, lower mould bottom plate is equipped with the positioning pin cooperation with positioning hole, lower mould bottom plate and lower mould plate can dismantle mechanical connection. Above -mentioned through the transition wall setting in transition inlay, avoid the stress concentration leading to lower mould plate load corner crack at transition corner, reduce the mould loss, through the draft angle of hole wall 1.5, facilitate demoulding, the position of splicing surface, facilitate the force cancellation, improve the stability of transition inlay position.

Description

Technical Field

[0001] This utility model relates to forging dies, and in particular to a right-angle anti-cracking forging lower die. Background Technology

[0002] Forging is a commonly used machining process for metal parts, with a wide range of applications. During the processing of metal blanks, a punch repeatedly impacts the blank, causing the walls of the formed holes to repeatedly bear impact forces. Stress concentration occurs at the transition corners of the formed holes during operation, making them highly susceptible to cracking under repeated impact loads. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a right-angle anti-cracking forging lower die.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a right-angle anti-cracking forging lower die, including a lower die base plate and a lower template disposed on the top of the lower die base plate. The lower template has a forming hole that runs vertically through the lower template. A transition insert is provided on the lower template. One side of the transition insert is a transition wall. The transition wall, the curved wall on the lower template, and the large straight wall form the forming hole. The draft angle of the forming hole wall is 1.5°. The bisector of the angle between the large straight wall and the transition wall is located in the mating surface of the transition insert and the large straight wall. The bisector of the angle between the curved wall and the transition wall is located in the mating surface of the transition insert and the curved wall. The bottom of the transition insert abuts against the top of the lower die base plate. The lower template has a guide post guide hole and a positioning hole. The lower die base plate has a positioning pin that mates with the positioning hole. The lower die base plate and the lower template are detachably mechanically connected.

[0005] As a further improvement to this design, the cross-section of the transition insert is an isosceles trapezoid, and the two bases of the cross-section of the transition insert are rounded.

[0006] As a further improvement to this design, the height of the transition insert is greater than the thickness of the forged blank and less than the depth of the forming hole.

[0007] As a further improvement to this design, the top edge of the curved wall and the top edge of the large straight wall are arc-shaped chamfers.

[0008] As a further improvement to this design, the lower template and the lower mold base plate are connected by bolts, which are distributed along the curved wall and the large straight wall.

[0009] As a further improvement to this design, the transition insert and the lower template are made of the same material, and the transition insert and the lower template are interference-fitted.

[0010] The beneficial effects of this utility model are: by setting the transition wall on the transition insert, this utility model avoids stress concentration at the transition corner, which would cause cracking at the corner of the lower template, thus reducing mold wear; the 1.5° draft angle of the hole wall facilitates demolding; and the position of the mating surface facilitates force offsetting, improving the stability of the transition insert position. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0013] Figure 2 This is a top view of the entire utility model.

[0014] Figure 3 This utility model is in Figure 2 Schematic diagram of the cross-section at position AA.

[0015] Figure 4 This utility model is in Figure 2 Schematic diagram of the cross-section at the BB position.

[0016] In the diagram: 1. Lower mold base plate, 2. Large straight wall, 3. Positioning hole, 4. Lower template, 5. Bolt, 6. Transition insert, 7. Transition wall, 8. Curved wall, 9. Forming hole, 10. Guide post guide hole, 11. Positioning pin. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0018] Example: A right-angle anti-cracking forging lower die includes a lower die base plate 1 and a lower template 4 disposed on the top of the lower die base plate 1. The lower template 4 has a forming hole 9 that runs vertically through the lower template 4. A transition insert 6 is provided on the lower template 4. One side of the transition insert 6 is a transition wall 7. The transition wall 7, the curved wall 8 on the lower template 4, and the large straight wall 2 form the forming hole 9. The draft angle of the forming hole 9 is 1.5°. The included angle between the large straight wall 2 and the transition wall 7 is flat. The dividing line is located within the mating surface of the transition insert 6 and the large straight wall 2. The bisector of the angle between the curved wall 8 and the transition wall 7 is located within the mating surface of the transition insert 6 and the curved wall 8. The bottom of the transition insert 6 abuts against the top of the lower mold base plate 1. The lower mold plate 4 is provided with guide post guide holes 10 and positioning holes 3. The lower mold base plate 1 is provided with positioning pins 11 that cooperate with the positioning holes 3. The lower mold base plate 1 and the lower mold plate 4 are detachably mechanically connected.

[0019] By placing the transition wall 7 on the transition insert 6, stress concentration at the transition corner is avoided, which could lead to cracking at the corner of the lower template 4, thus reducing mold wear. The 1.5° draft angle of the hole wall facilitates demolding. The position of the mating surface facilitates force offsetting and improves the stability of the position of the transition insert 6.

[0020] To facilitate balanced force distribution, the cross-section of the transition insert 6 is an isosceles trapezoid; the two bottom corners of the cross-section of the transition insert 6 are rounded to facilitate the fit between the transition insert 6 and the lower template 4.

[0021] The height of the transition insert 6 is greater than the thickness of the forged blank and less than the depth of the forming hole 9, which facilitates the precise installation of the transition insert 6.

[0022] The top edges of the curved wall 8 and the large straight wall 2 are chamfered to facilitate the engagement of the upper die punch.

[0023] The lower template 4 and the lower mold base plate 1 are connected by bolts 5, which are distributed along the curved wall 8 and the large straight wall 2, facilitating the assembly and disassembly of the lower template 4 and the lower mold base plate 1.

[0024] The transition insert 6 and the lower template 4 are made of the same material, which facilitates the balance of material stress. The transition insert 6 and the lower template 4 are interference-fitted, which improves the positional stability of the transition insert 6.

[0025] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A right-angle anti-cracking forging lower die, comprising a lower die base plate and a lower template disposed on the top of the lower die base plate, characterized in that, The lower mold plate has a forming hole that runs vertically through it. A transition insert is provided on the lower mold plate, with one side of the transition insert forming a transition wall. The transition wall, along with the curved wall and the large straight wall on the lower mold plate, forms the forming hole. The draft angle of the forming hole wall is 1.5°. The bisector of the angle between the large straight wall and the transition wall lies within the mating surface of the transition insert and the large straight wall. The bisector of the angle between the curved wall and the transition wall also lies within the mating surface of the transition insert and the curved wall. The bottom of the transition insert abuts against the top of the lower mold base plate. The lower mold plate has guide post holes and positioning holes. The lower mold base plate has positioning pins that mate with the positioning holes. The lower mold base plate and the lower mold plate are detachably mechanically connected.

2. The right-angle anti-cracking forging lower die according to claim 1, characterized in that, The transition insert has an isosceles trapezoidal cross-section, and the two bases of the transition insert have rounded corners.

3. A right-angle anti-cracking forging lower die according to claim 2, characterized in that, The height of the transition insert is greater than the thickness of the forged blank and less than the depth of the forming hole.

4. The right-angle anti-cracking forging lower die according to claim 1, characterized in that, The top edge of the curved wall and the top edge of the large straight wall are chamfered.

5. A right-angle anti-cracking forging lower die according to claim 1, characterized in that, The lower template and the lower template base plate are connected by bolts, which are distributed along the curved wall and the large straight wall.

6. A right-angle anti-cracking forging lower die according to any one of claims 1-5, characterized in that, The transition insert and the lower template are made of the same material, and the transition insert and the lower template are interference-fitted.

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