Die sleeve of upsetting crankshaft left and right dies

Abstract

The utility model discloses die sleeves of a left die and a right die for upsetting a crankshaft. The die sleeves are arranged between the left die and a left moving block and between the right die and a right moving block; the die sleeve is provided with a die thrust wall and a die sleeve thrust surface; the left mold and the right mold are both axially positioned and mounted with the mold thrust wall, and a bolt penetrates through an axial mounting hole of the mold thrust wall and then is locked by a nut, so that the left mold and the right mold are axially fixed with the mold sleeve; the die sleeve thrust surface is axially positioned and mounted with the die sleeve thrust walls of the left moving block and the right moving block, and a bolt penetrates through the axial mounting holes of the die sleeve thrust walls and then is locked by a nut to fix the die sleeve with the left moving block or the right moving block; the small crankshaft mold has the advantages that the material weight and the mold manufacturing cost of the small crankshaft mold are saved through the use of the mold sleeve.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a upset forging die, and more particularly to a die sleeve. Background Art

[0002] The production process technology of crankshaft upset forging is a production method in which each crank throw is individually subjected to die replacement, local heating, and local upset forging to form. After each batch of forgings is produced with the same crank throw through centralized and unified die replacement, local heating, and local upset forging, the die is then replaced, locally heated, and locally upset forged for the next identical crank throw. After multiple batches of die replacement, local heating, and local upset forging, the forging production of each batch of forgings for each crank throw and flange of the large crankshaft is completed.

[0003] The existing left and right die installation structures are as follows: including a left moving block and a right moving block, the left die is installed on the left moving block, and the right die is installed on the right moving block; the middle die is between the left die and the right die; since the inner profiles of the moving blocks are of the same specification, therefore, the outer profiles of the related dies need to be consistent; however, the crank throw length and the inner cavity of the small groove of the small crankshaft are small, resulting in the wall thickness of the die being relatively thick compared to its groove, so there is a waste phenomenon of large die diameter and long die length in the production of small crankshafts. Summary of the Utility Model

[0004] To solve the above technical problems, the purpose of the utility model is to provide a die sleeve for the left and right dies of an upset forging crankshaft, and die sleeves are arranged between the left die and the left moving block and between the right die and the right moving block; the die sleeve is provided with a die thrust wall and a die sleeve thrust surface; the left die and the right die are axially positioned and installed with the die thrust wall, and after a bolt passes through the axial installation hole of the die thrust wall, it is locked by a nut to axially fix the left die and the right die to the die sleeve; the die sleeve thrust surface is axially positioned and installed with the die sleeve thrust walls of the left moving block and the right moving block, and after a bolt passes through the axial installation hole of the die sleeve thrust wall, it is locked by a nut to fix the die sleeve to the left moving block or the right moving block;

[0005] A keyway one for cooperating with the left die and the right die is arranged on the inner side of the die sleeve, and a keyway two for cooperating with the left moving block and the right moving block is arranged on the outer side of the die sleeve;

[0006] The die sleeve is further provided with a radial installation hole, and a radial fixing pin shaft is inserted into the pin shaft holes of the left moving block and the right moving block and the radial installation hole of the die sleeve and then fixed to the left die or the right die.

[0007] The outer end of the radial fixing pin shaft is a thread, and the inner side of the pin shaft holes of the left moving block and the right moving block is a threaded hole, and the radial fixing pin shaft is screwed into the pin shaft hole.

[0008] The outer profile of the die sleeve matches the inner profiles of the left moving block and the right moving block; and the inner profile of the die sleeve matches the outer profiles of the left die and the right die.

[0009] For the upset forging process of a small crankshaft, the forging pressure required for forming is small, and the reverse forging force transmitted to the left and right dies during the forging process is also small. Therefore, when producing small crankshafts, by reducing the oil supply pressure of the hydraulic cylinder of the press, a smaller forging pressure of the press is obtained, providing good working conditions for the application of the die sleeve. The product of the area of the thrust surface of the die sleeve for axial positioning and installing the die and the ultimate extrusion stress should be greater than the maximum force applied to the positioning and installing surface during the upset forging process of the left and right dies of the upset forging, and there should be a certain safety factor. The axial positioning and installing surfaces of the die sleeve and the die, and the axial positioning and installing surfaces of the moving block and the die sleeve. The distance L between these two axial installing and positioning surfaces multiplied by the outer circle semi-circumference (πR) of the die is the area of the shear surface borne by the die sleeve. The product of this area and the ultimate shear stress should be greater than the maximum force applied to each die sleeve in the axial direction during the upset forging process and there should be a certain safety factor.

[0010] The advantages of the present utility model are: By using the die sleeve, the material weight of the small crankshaft die and the die manufacturing cost are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is an overall external view schematic diagram of an upset forging die of the prior art;

[0012] Figure 2 is Figure 1 longitudinal middle sectional view (the middle die is deleted);

[0013] Figure 3 is a schematic diagram of the die sleeve structure of the present utility model;

[0014] Figure 4 is an exploded schematic diagram of the present utility model;

[0015] Figure 5 is a schematic diagram of the structure of the present utility model;

[0016] In the figure, 11 is the upper left moving block, 12 is the lower left moving block, 13 is the upper right moving block, 14 is the lower right moving block, 21 is the upper left die sleeve, 22 is the lower left die sleeve, 23 is the upper right die sleeve, 24 is the lower right die sleeve, 31 is the upper left die, 32 is the lower left die, 33 is the upper right die, 34 is the upper right die, 4 is the bolt, 5 is the crankshaft, 6 is the middle die, 101 is the die sleeve thrust wall, 201 is the die thrust wall, 202 is the die sleeve thrust surface, 203 is the axial installation hole, 204 is the radial installation hole, 205 is the screw counterbore, 206 is the keyway one, 207 is the keyway two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be specifically described below in conjunction with the accompanying drawings. As shown in the figures, the upper left moving block 11 and the lower left moving block 12 form the left moving block, and the upper right moving block 13 and the lower right moving block 14 form the right moving block; the upper left die sleeve 21 and the lower left die sleeve 22 form the left die sleeve, and the upper right die sleeve 23 and the lower right die sleeve 24 form the right die sleeve; the upper left die 31 and the lower left die 32 form the left die, and the upper right die 33 and the lower right die 34 form the right die; die sleeves are provided between the left die and the left moving block and between the right die and the right moving block; the die sleeve is provided with a die thrust wall 201 and a die sleeve thrust surface 202; the left die and the right die are axially positioned and installed with the die thrust wall, and after the bolt 4 passes through the axial mounting hole 203 of the die thrust wall, it is locked by a nut to axially fix the left die and the right die to the die sleeve; the die sleeve thrust surface 202 is axially positioned and installed with the die sleeve thrust walls 101 of the left moving block and the right moving block, and after the bolt passes through the axial mounting hole 203 of the die sleeve thrust wall, it is locked by a nut to fix the die sleeve to the left moving block or the right moving block;

[0018] A first keyway 206 for cooperating with the left die and the right die is provided inside the die sleeve, and a second keyway 207 for cooperating with the left moving block and the right moving block is provided outside the die sleeve;

[0019] The die sleeve is further provided with a radial mounting hole 204, and a radially fixed pin shaft is inserted into the pin holes of the left moving block and the right moving block and the radial mounting hole of the die sleeve and then fixed to the left die or the right die.

[0020] The outer end of the radially fixed pin shaft is threaded, and the inner sides of the pin holes of the left moving block and the right moving block are threaded holes, and the radially fixed pin shaft is screwed into the pin holes.

[0021] For the convenience of modularization and reduction of production costs, the outer profile of the die sleeve matches the inner profiles of the left moving block and the right moving block; and the inner profile of the die sleeve matches the outer profiles of the left die and the right die.

[0022] As Figure 5 shown, when the present utility model is used to manufacture a small crankshaft die, the die material saved axially is the length L, and the die material saved radially is the thickness b. Therefore, the die material is saved.

Claims

1. A die sleeve for the left and right dies of a upset forging crankshaft, characterized in that: Die sleeves are provided between the left mold and the left moving block and between the right mold and the right moving block; the die sleeves are provided with die thrust walls and die sleeve thrust surfaces; the left mold and the right mold are axially positioned and installed with respect to the die thrust walls. After bolts pass through the axial installation holes of the die thrust walls, they are locked by nuts to axially fix the left mold and the right mold to the die sleeves; the die sleeve thrust surfaces are axially positioned and installed with respect to the die sleeve thrust walls of the left moving block and the right moving block. After bolts pass through the axial installation holes of the die sleeve thrust walls, they are locked by nuts to fix the die sleeves to the left moving block or the right moving block. A first keyway for cooperating with the left mold and the right mold is provided on the inner side of the die sleeve, and a second keyway for cooperating with the left moving block and the right moving block is provided on the outer side of the die sleeve. The die sleeve is further provided with radial installation holes. A radially fixed pin shaft is inserted into the pin holes of the left moving block and the right moving block and the radial installation holes of the die sleeve and then fixed to the left mold or the right mold.

2. The die sleeve of the upset forging crankshaft left and right dies according to claim 1, characterized in that: The outer end of the radially fixed pin shaft is threaded, and the inner sides of the pin holes of the left moving block and the right moving block are threaded holes. The radially fixed pin shaft is screwed into the pin holes.

3. The die sleeve of the upset forging crankshaft left and right dies according to claim 1, characterized in that: The outer profile of the die sleeve matches the inner profiles of the left moving block and the right moving block; while the inner profile of the die sleeve matches the outer profiles of the left mold and the right mold.

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