CN202655371U

CN202655371U - Cold extruding mould of gear shaft

Info

Publication number: CN202655371U
Application number: CN 201220109507
Authority: CN
Inventors: 张志平
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-22
Filing date: 2012-03-22
Publication date: 2013-01-09
Anticipated expiration: 2022-03-22

Abstract

The utility model relates to a cold extruding mould of a gear shaft, and belongs to the technical field of extrusion moulding of alloy materials. By providing the cold extruding mould of the gear shaft, blanks and parts can be fed or discharged safely and automatically. A die cavity is formed between a male die (5) and an inner layer female die (8); the male die (5) is arranged in an upper die base (1) and connected to the upper die base (1) through an upper base plate (4), a fixing ring (2) and a screw; the inner layer female die (8) and a tooth-form insert female die (16) are arranged on a lower die base (11); the inner layer female die (8) and the tooth-form insert cavity die (16) are in interference fit with a middle reinforcing ring (9); the inner layer female die (8) is connected to an outer reinforcing ring (17) through a screw (18) and a cushion block (19); and a top plate (13) is arranged below the lower die base (11). By adopting the cold extruding mould of the gear shaft, the production cost is reduced, the production efficiency is greatly improved, waste processing is reduced, materials are saved, and the quality of parts is obviously improved.

Description

A kind of gear shaft cold extrusion die

Technical field

The invention belongs to alloy material extrusion forming technology field, be specifically related to a kind of gear shaft cold extrusion die.

Background technology

Auto industry operation mainstay of the national economy industry develops extremely rapidly, how to limit energy usage, improves energy utilization rate, reduces discharge amount of exhaust gas, to preserve the ecological environment and people's living environment particularly important.At present, people can be to lead, tin, aluminium, copper, zinc and alloy thereof, mild steel, medium carbon steel, tool steel, the metal such as low-alloy steel and stainless steel carries out finished parts, according to what the complexity of material character and part occurred high pressure arranged, low pressure, gravity, founding, fusible pattern, ceramic casting, turning, drilling, milling, mill processing etc., even to bearing steel, high-carbon high-aluminium alloy tool steel, high-speed steel can only adopt, turning, drilling, milling, mill processing, the forge hot method, its processing capacity is long large process time, cause production cost large, production efficiency is low, because the concrete part of its material character can only be selected single casting, and mould, the board equipment investment is larger, each later process such as surface treatment and heat treatment increases, and has virtually increased production cost.

Summary of the invention

The purpose of this utility model provides a kind of gear shaft cold extrusion die, the safely and automatically charging of blank and product with go out part, High-efficient Production reduces the mould input cost in batches, road manufacturing procedure after reducing.

The present invention is achieved through the following technical solutions:

A kind of gear shaft cold extrusion die, this mould comprise upper bolster 1, punch 5, die shoe 11, internal layer die 8, middle stiffening ring 9, outer stiffening ring 17; It is characterized in that: form die cavity between punch 5 and the internal layer die 8, punch 5 is arranged in the upper bolster 1, be provided with die shank 3 on the upper bolster 1, punch 5 is connected on the upper bolster 1 by upper padding plate 4, retainer plate 2, screw, also is provided with guide pin bushing 61 four jiaos of upper bolsters and does with guide pillar 12 and be slidingly matched; Be provided with internal layer die 8 and the profile of tooth die 16 of inserting on the described die shoe 11, internal layer die 8 and profile of tooth insert die 16 and middle stiffening ring 9 interference fit, below internal layer die 8, also be provided with knock-pin cover for seat 15, be provided with push rod 10 in the knock-pin cover for seat 15, internal layer die 8 is connected with cushion block 19 by screw 18 and is arranged on the outer stiffening ring 17, also be provided with top board 13 below die shoe 11, described top board 13 middle parts are provided with a hole, are provided with push rod 14 in the hole.

Punch 5 described above is that 2Cr12MoV makes by material, and hardness reaches 60--64HRC after its heat treatment.

Internal layer die 8 described above adopts three layers of combined die mode, combined by core rod and two-layer shrink ring, and radial interference assembling oblique angle 0.5 degree between the shrink ring, unit bears pressure 1400--2500MPa,

Middle stiffening ring 9 described above is that 40Cr makes by material, and hardness reaches 45--47HRC after its heat treatment.

Outer stiffening ring 17 inner hollow described above, four jiaos are provided with the guide pillar hole.

Top board 13 four corners positions described above are provided with the guide pillar hole.

Beneficial effect of the present invention:

After adopting said structure, Structure Design of Cold Extruding Die of the present utility model is simple, employed special-purpose board is hydraulic press, the accurate any surface finish of extrusion sections size saves material high productivity, but the part of machining shape complexity, cold-extruded part intensity is high, good rigidly and lightweight, the replacing of operation directly replace with punch 5 and internal layer die 8, die change and safeguard quick and convenient, thereby reduced the input of special equipment, optimized production process, reduced production frock cost, product technique is simple, production efficiency improves greatly, and realized less waste material processing, saved raw material, parts quality has also obtained obvious improvement.

Description of drawings

Fig. 1 is the utility model part blank schematic diagram.

Fig. 2 is the utility model cavity die structure schematic diagram.

Fig. 3 is the utility model unitary mould structural representation.

Among the figure, upper bolster 1, retainer plate 2, die shank 3, upper padding plate 4, punch 5, guide pin bushing 6, adjusting nut 7, internal layer die 8, middle stiffening ring 9, knock-pin 10, die shoe 11, guide pillar 12, top board 13, push rod 14, knock-pin cover for seat 15, profile of tooth insert die 16, outer stiffening ring 17, screw 18, cushion block 19.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described further:

A kind of gear shaft cold extrusion die, this mould comprise upper bolster 1, punch 5, die shoe 11, internal layer die 8, middle stiffening ring 9, outer stiffening ring 17; Form die cavity between punch 5 and the internal layer die 8, punch 5 is arranged in the upper bolster 1, be provided with die shank 3 on the upper bolster 1, punch 5 is by upper padding plate 4, retainer plate 2, screw is connected on the upper bolster 1, described punch 5 is that 2Cr12MoV makes by material, hardness reaches 60--64HRC after its heat treatment, also being provided with guide pin bushing 61 four jiaos of upper bolsters does with guide pillar 12 and is slidingly matched, be provided with internal layer die 8 and the profile of tooth die 16 of inserting on the described die shoe 11, internal layer die 8 and profile of tooth insert die 16 and middle stiffening ring 9 interference fit, described middle stiffening ring 9 is that 40Cr makes by material, and hardness reaches 45--47HRC after its heat treatment.Below internal layer die 8, also be provided with knock-pin cover for seat 15, described internal layer die 8 adopts three layers of combined die mode, combined by core rod and two-layer shrink ring, radial interference assembling oblique angle 0.5 degree between the shrink ring, unit bears pressure 1400--2500MPa, be provided with push rod 10 in the knock-pin cover for seat 15, internal layer die 8 is connected with cushion block 19 by screw 18 and is arranged on the outer stiffening ring 17, described outer stiffening ring 17 inner hollow, four jiaos are provided with the guide pillar hole, also be provided with top board 13 below die shoe 11, described top board 13 middle parts are provided with a hole, are provided with push rod 14 in the hole.

The cold-stamped processing method is to utilize the principle of Plastic Deformation of Metal Materials, under the condition of room temperature, the cold metal blank is put into the mold cavity that is contained on the forcing press, under powerful pressure and certain velocity function, force blank to produce Plastic Flow, by the gap of punch and die or the outlet of die, extrude solid parts hollow or that section is less than blank, can obtain required definite shape and size, also have the technology that higher force is learned the performance extrusion.

For its die of intensity that improves die adopts horizontal or vertical subdivision structure, prevent that longitudinal crack from producing, utilize interference fit, die is tightly set up and the multilayer cavity die structure made with one or two shrink ring, because the interior die in the combined die and shrink ring adopt interference fit, both contact-making surfaces produce contact prestressing force after being pressed into.Therefore, during the combined die extruding, the tangential stress that interior die produces reduces with regard to being cancelled, and the tangential stress that produces on the shrink ring is applied and increases.Like this, interior die is tending towards identical with the tangential stress of shrink ring.If the size Selection of combined die shrink ring gets suitably, the magnitude of interference is also enough large, even can make the indent mould get inwall not have tangential stress fully in when extruding, because extrusion pressure is larger, two molds of this design all adopt three layers to answer in advance combined die.

During work the metal blank after annealed, the surface treatment is placed on first in the cold extrusion die cavity, at room temperature, exert pressure to blank by punch fixing on the forcing press, make metal blank generation plastic deformation and make part, the advantage of its cold extruding technique is: 1, the accurate any surface finish of extrusion sections size: the cold-extruded part stock size precision of at present China's development can reach 8～9 grades, if adopt desirable lubricating to reach (referring to fine aluminium and red copper part), be only second to the finishing polish surface.Therefore the part made from cold extrusion method does not generally need reprocessing, and a small amount of only need fine finishining (grinding).2, save material: the cold-extruded part stock utilization can reach more than 80% usually, can save great deal of steel and nonferrous materials.3, high productivity: the efficient with cold extrusion method manufacturing machine part is very high, and particularly the large part of production lot is produced comparable machining with cold extrusion method and improved several times, tens times even hundred times.The productivity ratio of a cold extrusion automatic machine is equivalent to the productivity ratio of 100 engine lathes or 10 four spindle lathes.But the part of 4 machining shape complexity: such as odd-shaped cross section, internal tooth, irregularly-shaped hole and blind hole etc., these parts adopt other processing method to be difficult to finish, and with very convenient, the shown part of cold extrusion processing, can easily extrude.5, high, the good rigidly of cold-extruded part intensity and lightweight: because the cold work reinforced characteristic of metal material cold deformation is adopted in cold extrusion, be that metal blank is in the three-dimensional compressive stress state in the extrusion process, be out of shape rear material structure densification and have continuous fiber flow direction, thereby the intensity of product improves a lot, replace high-strength material with regard to available low-intensity material like this, the cold-extruded platen press is higher than the manufacturing of machining method.

Because the difference that operation arranges, thereby need continual more mold exchange, when punch 5 needs to change, cope match-plate pattern 1 tightened up a screw disassemble retainer plate 2 and just can pull down and change punch 5, when internal layer die 8 needs to change, the cushion block 19 of screw 18 is disassembled with regard to replaceable internal layer die 8, and Design of Dies and change is simply changed and is safeguarded quick and convenient.

Claims

1. gear shaft cold extrusion die, this mould comprises upper bolster (1), punch (5), die shoe (11), internal layer die (8), middle stiffening ring (9), outer stiffening ring (17); It is characterized in that: form die cavity between punch (5) and the internal layer die (8), punch (5) is arranged in the upper bolster (1), be provided with die shank (3) on the upper bolster (1), punch (5) is connected on the upper bolster (1) by upper padding plate (4), retainer plate (2), screw, also is provided with guide pin bushing (6) and guide pillar (12) (1) four jiao of upper bolster and does and be slidingly matched; Be provided with internal layer die (8) and the profile of tooth die (16) of inserting on the described die shoe (11), internal layer die (8) and profile of tooth insert die (16) and middle stiffening ring (9) interference fit, also be provided with knock-pin cover for seat (15) in the below of internal layer die (8), be provided with push rod (10) in the knock-pin cover for seat (15), internal layer die (8) is connected with cushion block (19) by screw (18) and is arranged on the outer stiffening ring (17), also be provided with top board (13) in die shoe (11) below, described top board (13) middle part is provided with a hole, is provided with push rod (14) in the hole.

2. a kind of gear shaft cold extrusion die according to claim 1, it is characterized in that: described punch (5) is that 2Cr12MoV makes by material, and hardness reaches 60--64HRC after its heat treatment.

3. a kind of gear shaft cold extrusion die according to claim 1, it is characterized in that: described internal layer die (8) adopts three layers of combined die mode, combined by core rod and two-layer shrink ring, radial interference assembling oblique angle 0.5 degree between the shrink ring, unit bears pressure 1400--2500MPa

4. a kind of gear shaft cold extrusion die according to claim 1, it is characterized in that: described middle stiffening ring (9) is that 40Cr makes by material, and hardness reaches 45--47HRC after its heat treatment.

5. a kind of gear shaft cold extrusion die according to claim 1, it is characterized in that: described outer stiffening ring (17) inner hollow, four jiaos are provided with the guide pillar hole.

6. a kind of gear shaft cold extrusion die according to claim 1, it is characterized in that: described top board (13) four corners position is provided with the guide pillar hole.