CN220216600U - Lower die insert structure of welding fork forging die - Google Patents

Abstract

The utility model discloses a lower die insert structure of a welding fork forging die, which relates to the field of welding fork forging and comprises an outer ring and an insert, wherein an inner hole is formed in the center of the outer ring and used for being placed in the insert, a die cavity is formed between the top of the inner hole and the insert, the bottom plane of the insert is in interference fit with the lower opening of the inner hole, the bottom plane adopts a circular structure with a notch, a straight edge is arranged at the notch, the lower opening of the inner hole is matched with the shape of the bottom plane, and the outer ring and the insert are positioned through the straight edge on the bottom plane. The utility model positions and prevents rotation between the forging die outer ring and the insert through the straight edge, and the problem that the fixed key loosens and falls off is avoided without the help of the fixed key; the bottom plane is in interference fit with the lower opening of the inner hole, and the outer ring is made of red material with the temperature of 900-1150 ℃ during installation, and the insert core can smoothly enter the outer ring by utilizing the thermal expansion principle; the central angle formed by the straight edge and the bottom plane is 60 degrees, the direction of X, Y can be controlled when the outer ring is matched with the insert, and the rotation direction is controlled by the straight edge.

Description

Lower die insert structure of welding fork forging die

Technical Field

The utility model relates to the field of welding fork forging, in particular to a lower die insert structure of a welding fork forging die.

Background

The welding fork is a common part in an automobile transmission shaft, and is an existing welding fork lower die forging structure, as shown in fig. 1 and 2, and the structure comprises an outer ring (1 ') and an insert (2 ') embedded in the outer ring, and the outer ring and the insert are in interference fit through a fixed key (3 '). Because forging is a high vibration process, in the environment with large vibration force in a normal period, the fixed key is easy to loosen, and falls off in the use process. After the fixed key is separated, the insert and the outer ring cannot be fixed, so that rotation can be generated, and the quality of the forging is affected.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides a lower die insert structure of a welding fork forging die, which solves the rotation problem of an outer ring and an insert of the forging die and simultaneously cancels a fixed key.

The utility model aims at being completed by the following technical scheme: the lower die insert structure of the welding fork forging die comprises an outer ring and an insert, wherein an inner hole is formed in the center of the outer ring and used for being placed in the insert, a die cavity used for forging is formed between the top of the inner hole and the insert, the bottom plane of the insert is matched with the lower opening of the inner hole in an interference mode, the bottom plane adopts a round structure with a notch, a straight edge is arranged at the notch, the lower opening of the inner hole is matched with the shape of the bottom plane, and the outer ring and the insert are positioned through the straight edge on the bottom plane, so that anti-rotation is realized.

As a further technical scheme, the central angle formed by connecting the two ends of the straight edge with the center of the bottom plane is 60 degrees.

As a further technical scheme, the bottom plane is 0.15mm larger than the single side of the lower opening of the inner hole.

As a further technical scheme, the outer ring is made of red materials with the temperature of 900-1150 ℃.

The beneficial effects of the utility model are as follows:

1. the outer ring and the insert are positioned through the straight edge to prevent rotation, a fixed key is not needed, and the problem that the fixed key loosens and falls off is avoided;

2. the bottom plane is in interference fit with the lower opening of the inner hole, and the outer ring is made of red material with the temperature of 900-1150 ℃ during installation, so that the insert core can be smoothly installed into the outer ring by utilizing the thermal expansion principle;

3. the central angle formed by the straight edge and the bottom plane is 60 degrees (300 degrees), the direction of X, Y can be controlled when the outer ring is matched with the insert, and the rotation direction can be controlled by the straight edge and the bottom plane.

Drawings

Fig. 1 is a cross-sectional view of a prior art structure.

Fig. 2 is a view in the direction a of fig. 1.

Fig. 3 is a cross-sectional view of the structure of the present utility model.

Fig. 4 is a B-direction view of fig. 3.

Reference numerals illustrate: an outer ring 1', a core insert 2', and a fixed key 3';

the outer ring 1, the inner hole 11, the die cavity 12, the insert 2, the bottom plane 21 and the straight edge 22.

Detailed Description

The utility model will be described in detail below with reference to the attached drawings:

examples: as shown in fig. 3 and 4, the lower die insert structure of the welding fork forging die comprises an outer ring 1, an inner hole 11, a die cavity 12, an insert core 2, a bottom plane 21 and a straight edge 22.

An inner hole 11 is formed in the center of the outer ring 1, and the insert 2 is placed into the outer ring 1 from the inner hole 11, so that a die cavity 12 is formed between the top of the inner hole 11 and the insert 2, and can be used for forging a welding fork.

An interference fit is adopted between the bottom plane 21 of the insert 2 and the lower mouth of the inner hole 11, and the bottom plane 21 is preferably 0.15mm larger than the single side of the lower mouth of the inner hole 11. The bottom plane 21 adopts a circular structure with a notch, and a straight edge 22 is arranged at the notch (preferably, referring to fig. 4, the straight edge 22 is perpendicular to the horizontal axis of the outer ring 1 and parallel to the vertical axis of the outer ring 1), the lower opening of the inner hole 11 is matched with the shape of the bottom plane 21 (also the circular shape with the notch), so that the outer ring 1 and the insert 2 are positioned through the straight edge 22 on the bottom plane 21, and anti-rotation is realized. The central angle alpha formed inside the connecting line of the upper and lower ends of the straight edge 22 and the center of the bottom plane 21 is 60 degrees, and the central angle formed outside the connecting line (namely, the central angle occupied by the arc part on the bottom plane 21) is 300 degrees.

Preferably, the outer ring 1 is formed by heating red material at 900-1150 ℃ during installation.

The working process of the utility model comprises the following steps: when the forging die is installed, the outer ring 1 is heated to 900-1150 ℃ to form red material, and the lower opening of the inner hole 11 is expanded due to the principle of expansion with heat and contraction with cold, so that the insert 2 can be smoothly installed into the outer ring 1, and the insert 2 is positioned by the straight edge 22. During subsequent forging, the temperature of the outer ring 1 is reduced, so that the lower opening of the inner hole 11 is contracted to clamp the insert 2, the interference fit is realized, the falling off or the relative rotation can not occur, and the forging processing of the welding fork can be smoothly performed.

It should be understood that equivalents and modifications to the technical scheme and the inventive concept of the present utility model should fall within the scope of the claims appended hereto.

Claims (4)

1. The utility model provides a welding fork forging die lower mould inserts structure which characterized in that: including outer lane (1) and mold core (2), an hole (11) is seted up at the center of outer lane (1) and is used for imbedding mold core (2), forms die cavity (12) that are used for forging between hole (11) top and mold core (2), and the bottom plane (21) of mold core (2) and the lower mouth of hole (11) are through surplus cooperation, and bottom plane (21) adopts the circular structure of taking the breach set up a straight flange (22) in breach department, the lower mouth of hole (11) and the shape phase-match of bottom plane (21) make between outer lane (1) and mold core (2) through straight flange (22) location on bottom plane (21), realize preventing changeing.

2. The welding fork forging die lower die insert structure as recited in claim 1, wherein: the central angle formed by connecting the two ends of the straight edge (22) with the center of the bottom plane (21) is 60 degrees.

3. The welding fork forging die lower die insert structure as recited in claim 2, wherein: the bottom plane (21) is 0.15mm larger than the single side of the lower opening of the inner hole (11).

4. A weld fork forging die lower die insert structure as recited in claim 3, wherein: the outer ring (1) is made of red material with the temperature of 900-1150 ℃.