CN215845699U - Radial-jump machining-free powder metallurgy rotor forming die structure - Google Patents

Abstract

The utility model provides a diameter jump exempts from powder metallurgy rotor class forming die structure of processing, includes upper punch, bed die, down punch, plug and plug annex, and upper punch, bed die, down punch, plug and plug annex pass through clamping ring, bolt fastening on powder metallurgy die carrier, are equipped with water-cooling constant temperature equipment in the bed die, and the down punch is the interior cycloid structure of excircle, and the outline of plug is cycloid shape, and the inner chamber is the screw hole of taking the counter bore, and the length of the effective section of down punch and the length of the effective section of the cycloid outline of plug are according to the part height extension that takes shape respectively, and the plug annex is central cylinder piston structure, adds bottom plate and locating lever in central cylinder piston structure position. The utility model has simple and reasonable structure, has the characteristics of good forming effect and stable radial run-out of formed parts, better solves the problem of large radial run-out fluctuation of formed blanks, can realize the process of free machining of the radial run-out of the parts, saves the manufacturing cost of the parts, and fills the gap that the domestic similar rotor powder metallurgy can not be produced in large batch.

Description

Radial-jump machining-free powder metallurgy rotor forming die structure

Technical Field

The utility model belongs to the technical field of powder metallurgy manufacturing, relates to a die structure, and particularly relates to a radial jump machining-free powder metallurgy rotor type forming die structure.

Background

With the continuous decline of domestic automobile price, the profit of each automobile manufacturer is lower and lower, impels to reduce the automobile parts cost constantly. The cycloid oil pump rotor is one of important parts of the automobile oil pump, and needs to be continuously optimized and improved to meet the market requirement. However, the conventionally designed powder metallurgy oil pump rotor needs to be machined to ensure the radial jump tolerance, and the machining takes time, wastes materials, wastes labor and other factors, so that certain manufacturing defects exist.

According to the research, foreign powder metallurgy manufacturers have processes which can achieve the radial jump machining-free process of the outer diameter of the rotor, mass production is achieved, and at present, the rotors with high radial jump precision in China have no related reports that powder metallurgy manufacturers can directly achieve mass production without machining. Therefore, the radial jump processing-free powder metallurgy rotor forming die structure is urgently needed to be designed, so that the blank of the domestic large-batch production of the rotors is filled, and the market demand is met.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a radial jump machining-free powder metallurgy rotor forming die structure which is simple in structure and good in forming effect aiming at the technical current situation, can realize the radial jump machining-free of parts, and effectively saves the manufacturing cost of the parts.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a jump and exempt from powder metallurgy rotor class forming die structure of processing which characterized in that: the forming die structure comprises an upper punch, a female die, a lower punch, a core rod and a core rod accessory, wherein the upper punch, the female die, the lower punch, the core rod and the core rod accessory are fixed on a powder metallurgy die frame through pressing rings and bolts, a water-cooling constant temperature device is arranged in the female die, the lower punch is of an excircle hypocycloid structure, the outer contour of the core rod is in a cycloid shape, an inner cavity of the core rod is a screw hole with a counter bore, the length of an effective section of the lower punch and the length of an effective section of the cycloid outer contour of the core rod are respectively lengthened by 1.2-2 times and 3-4 times according to the height of a formed part, the core rod accessory is of a central cylinder piston structure, and a bottom plate and a positioning rod are additionally arranged at the position of the central cylinder piston structure.

As an improvement, the female die is divided into three layers from inside to outside, wherein the outer layer is an outer sleeve layer with an upper step and a lower step, the upper end surface of the outer layer is provided with two screw holes, the lower end of the outer layer is provided with a die cavity installation step, the middle layer is a cylindrical ring sleeve, the inner layer is a cavity layer of a powder metallurgy forming part, the shape of the inner layer is a cylindrical ring sleeve, and the outer layer, the middle layer and the inner layer are combined together in an interference fit mode through a hot sleeve process.

Further, the structure of the water-cooling constant temperature device is as follows: the lower end of the outer layer of the female die is provided with a water through hole for cooling water, the inner side of the outer layer is transversely provided with a water through groove communicated with the water through hole, the outer diameter surface of the middle layer is provided with a plurality of circles of spiral water through pipelines, and the spiral water through pipelines are communicated with the water through groove.

And furthermore, the number of the water passing grooves is at least two, the water passing grooves are respectively distributed at the left side and the right side of the outer layer of the female die in an up-and-down mode, the number of the water passing openings corresponds to that of the water passing grooves, the number of spiral turns of the spiral water passing pipeline is 4-8, the water passing grooves transversely penetrate through the outer layer of the female die, and sealing joints are arranged on the outer side surface of the female die corresponding to the positions of water outlets of the water passing grooves.

Furthermore, the lower punch is circular in outer contour, the inner cavity is a cycloid cavity, the circular effective section of the outer contour is 25-45 mm, the radial manufacturing precision is +/-0.003 mm, the effective section of the inner cavity is 45-60 mm, the radial manufacturing precision is +/-0.003 mm, an axial strip-shaped non-penetrating flat groove is formed in the outer contour, the width of the flat groove is 5-15 mm, the depth of the flat groove is 10-30 mm, and the depth of the flat groove is 0.15-0.5 mm.

Further, the core rod comprises a core rod effective section and a core rod connecting rod, wherein the length of the cycloidal contour effective section of the core rod effective section is 80-120 mm, the radial manufacturing precision is +/-0.003 mm, the length of the inner cavity effective section is 100-150 mm, and the radial manufacturing precision is +/-0.005 mm.

Furthermore, the bottom plate of the central cylinder of the mandrel accessory is a circular flat plate, four semicircular notches are concavely arranged on the periphery of the bottom plate, a circular step through hole in clearance fit with the positioning rod is formed in the central eccentric position of the bottom plate, and correspondingly, a through hole for the positioning rod to penetrate through is formed in the piston structure of the central cylinder.

And finally, the positioning rod is a cylinder with steps, the length of the positioning rod is 90-110 mm, the tolerance is +/-0.1 mm, the diameter is 10-15 mm, the outer diameter of the step cylinder is 10-20 mm, and the thickness is 5-10 mm.

Compared with the prior art, the utility model has the advantages that: the female die is divided into an inner layer and an outer layer, a water-cooling constant temperature device is arranged in the female die and comprises a water through hole positioned at the lower end of the outer layer of the female die, a water through groove transversely formed in the inner side of the outer layer and a spiral water through pipeline formed in the outer diameter surface of the middle layer, so that heat generated by friction in the operation of the die is effectively reduced under the condition that the die is constant in temperature, and the condition that the die is hung and pulled is damaged is avoided; the matching section of the lower punch and the core rod is lengthened, so that the axial shaking amplitude of the up-and-down operation of the die can be stabilized; because plug length is long, can not guarantee the stability of plug up-and-down operation at conventional plug cylinder structural design, increased bottom plate and locating lever at central cylinder annex, effectively reduced the plug and connect the pole because of the long axial wobbling range that leads to of span. The utility model has simple and reasonable structure, has the characteristics of good forming effect and stable radial run-out of formed parts, better solves the problem of large radial run-out fluctuation of formed blanks, can realize the process of free machining of the radial run-out of the parts, saves the manufacturing cost of the parts, and fills the gap that the domestic similar rotor powder metallurgy can not be produced in large batch.

Drawings

FIG. 1 is a schematic view of a rotor structure according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view of an assembled embodiment of the present invention;

FIG. 4 is a cross-sectional view of a female mold of an embodiment of the utility model;

FIG. 5 is a cross-sectional view of the upper punch;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a cross-sectional view of the mandrel;

FIG. 8 is a cross-sectional view of a undershoot;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a cross-sectional view of the piston structure of the mandrel attachment;

FIG. 11 is a side view of FIG. 10;

FIG. 12 is a cross-sectional view of the base plate of the mandrel attachment;

FIG. 13 is a side view of FIG. 12;

FIG. 14 is a cross-sectional view of a positioning rod of the mandrel attachment;

fig. 15 is a top view of fig. 14.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 15, the forming die structure for the radial jump machining-free powder metallurgy rotors comprises an upper punch 2, a female die 1, a lower punch 4, a core rod 3 and a core rod accessory 5, wherein the upper punch 2, the female die 1, the lower punch 4, the core rod 3 and the core rod accessory 5 are fixed on a powder metallurgy die carrier through a pressing ring and a bolt, a water-cooling constant temperature device is arranged in the female die 1, the lower punch 4 is of an excircle hypocycloid structure, the outer contour of the core rod 3 is of a cycloidal shape, an inner cavity is a screw hole with a counter bore, the length of an effective section of the lower punch 4 and the length of an effective section of the cycloidal outer contour of the core rod 3 are respectively lengthened by 1.2 to 2 times and 3 to 4 times according to the height of a formed part, the core rod accessory 5 is a center cylinder piston structure 51, and a bottom plate 52 and a positioning rod 53 are additionally arranged at the position of the center cylinder piston structure 51.

The concrete structure is as follows: the female die 1 is divided into three layers from inside to outside, wherein an outer layer 11 is an outer sleeve layer with upper and lower steps, two screw holes 111 are formed in the upper end face of the outer layer, a die cavity mounting step is arranged at the lower end of the outer layer, a middle layer 12 is a cylindrical ring sleeve, an inner layer 13 is a cavity layer of a powder metallurgy forming part, the shape of the inner layer 13 is the cylindrical ring sleeve, an inner cavity is machined into a cylindrical inner cavity or a cycloid-shaped cavity through wire cutting, and the tolerance is set to be +/-0.003 mm. The outer layer 11, the intermediate layer 12 and the inner layer 13 are bonded together by interference fit through a shrink-fit process. The structure of the water-cooling constant temperature device is as follows: the lower end of the outer layer 11 of the female die 1 is provided with a water through hole 113 for cooling water, the inner side of the outer layer 11 is transversely provided with a water through groove 112 communicated with the water through hole 113, the outer diameter surface of the middle layer 12 is provided with a plurality of circles of spiral water through pipelines 121, and the spiral water through pipelines 121 are communicated with the water through groove 112. The number of the water through grooves 112 is at least two, the water through grooves are respectively distributed on the left side and the right side of the outer layer 11 of the female die 1 in an up-and-down mode, the number of the water through openings 113 corresponds to that of the water through grooves 112, the number of spiral turns of the spiral water pipeline 121 is 4-8, the water through grooves 112 transversely penetrate through the outer layer 11 of the female die 1, a sealing joint 114 is arranged on the outer side surface of the female die 1 corresponding to the position of a water outlet of the water through grooves 112, the diameter of the water through openings 113 and the diameter of the water through grooves 112 in the embodiment are phi 5-8 mm, the flow direction of cooling water flows from bottom to top, and the water-cooling constant temperature device is arranged, so that heat generated by friction in the operation of the die can be effectively reduced, and the die hanging and pulling damage can be avoided.

The upper punch 2 is of conventional construction for a powder metallurgy punch and will not be described in detail here.

The outer contour of the lower punch 4 is circular, the inner cavity is a cycloid cavity, the length of an effective section of the lower punch 4 needs to be lengthened, the effective section of the circular outer contour is generally set to be 25-45 mm according to the height of a formed part, the radial manufacturing precision is +/-0.003 mm, the effective section of the inner cavity is 45-60 mm, the radial manufacturing precision is +/-0.003 mm, an axial strip-shaped non-penetrating flat groove 41 is formed in the outer contour, the width of the flat groove 41 is 5-15 mm, the length of the flat groove is 10-30 mm, and the depth of the flat groove is 0.15-0.5 mm.

The core rod 3 is a screw hole with a cycloid-shaped outer contour and a counter bore in an inner cavity, the core rod 3 comprises a core rod effective section 31 and a core rod connecting rod 32, the length of the cycloid-shaped outer contour effective section of the core rod effective section 31 needs to be lengthened, the length of the cycloid-shaped outer contour effective section is generally set to be 80-120 mm according to the height of a formed part, the radial manufacturing precision is +/-0.003 mm, the inner cavity effective section is generally set to be 100-150 mm according to the radial size of the formed part, the radial manufacturing precision is +/-0.005 mm, the design simplification and usability of a core rod bolt are considered, and the size of the designed inner cavity refers to GB/T70.1-2000 of the national standard of inner hexagon cylindrical head screws as far as possible.

The central cylinder piston structure 51 of the core rod accessory 5 is additionally provided with a bottom plate 52 and a positioning rod 53 on the basis of the structure designed by the original conventional powder metallurgy common cylinder, and meanwhile, a sealing ring is sealed. The bottom plate 52 is a circular flat plate, four semicircular notches 522 are concavely arranged on the periphery of the bottom plate 52, the size radius of each semicircular notch 522 is R20 mm-R40 mm, the thickness T is 8 mm-15 mm, and the end surface roughness is less than Ra0.8. A circular step through hole 521 which is in clearance fit with the positioning rod 53 is formed in the center eccentric position of the bottom plate 52, and a through hole 511 through which the positioning rod 53 passes is correspondingly formed in the center cylinder piston structure 51. The positioning rod 53 is a cylinder with steps, the length of the positioning rod 53 is 90 mm-110 mm, the tolerance is +/-0.1 mm, the diameter is 10 mm-15 mm, the tolerance is +/-0.005 mm, the end surface is provided with a chamfer of 0.5 mm-1.5 mmX 30-50 degrees, the outer diameter of the step cylinder is 10 mm-20 mm, and the thickness is 5 mm-10 mm. The bottom plate 52 and the positioning rod 53 are additionally arranged, so that the axial shaking amplitude of the mandrel extension rod 32 caused by long span is effectively reduced, and the stability of the up-and-down operation of the mandrel 3 is ensured.

The structure of the utility model is slightly improved on the basis of the original forming die structure, thereby achieving the effect of stable radial run-out of the formed part, better solving the problem that the radial run-out of the formed blank is large in fluctuation and needs additional processing, saving the manufacturing cost of the part and filling the gap of the domestic large-batch production of the rotors.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides a jump and exempt from powder metallurgy rotor class forming die structure of processing which characterized in that: the forming die structure comprises an upper punch, a female die, a lower punch, a core rod and a core rod accessory, wherein the upper punch, the female die, the lower punch, the core rod and the core rod accessory are fixed on a powder metallurgy die frame through pressing rings and bolts, a water-cooling constant temperature device is arranged in the female die, the lower punch is of an excircle hypocycloid structure, the outer contour of the core rod is in a cycloidal shape, an inner cavity is a screw hole with a counter bore, the length of an effective section of the lower punch and the length of a cycloidal outer contour effective section of the core rod are respectively lengthened by 1.2-2 times and 3-4 times according to the height of a formed part, the core rod accessory is of a central cylinder piston structure, and a bottom plate and a positioning rod are additionally arranged at the position of the central cylinder piston structure.

2. The powder metallurgy rotor-type forming die structure according to claim 1, wherein: the female die is divided into three layers from inside to outside, wherein the outer layer is an outer sleeve layer with an upper step and a lower step, the upper end surface of the outer layer is provided with two screw holes, the lower end of the outer layer is provided with a die cavity installation step, the middle layer is a cylindrical ring sleeve, the inner layer is a cavity layer of a powder metallurgy forming part, the shape of the inner layer is a cylindrical ring sleeve, and the outer layer, the middle layer and the inner layer are combined together in an interference fit mode through a hot sleeve process.

3. The powder metallurgy rotor-like forming die structure of claim 2, wherein: the structure of the water-cooling constant temperature device is as follows: the lower end of the outer layer of the female die is provided with a water through hole for cooling water, the inner side of the outer layer is transversely provided with a water through groove communicated with the water through hole, the outer diameter surface of the middle layer is provided with a plurality of circles of spiral water through pipelines, and the spiral water through pipelines are communicated with the water through groove.

4. The powder metallurgy rotor-type forming die structure according to claim 3, wherein: the number of the water passing grooves is at least two, the water passing grooves are respectively distributed at the left side and the right side of the outer layer of the female die in an up-and-down mode, the number of the water passing openings corresponds to that of the water passing grooves, the number of spiral turns of the spiral water passing pipeline is 4-8, the water passing grooves transversely penetrate through the outer layer of the female die, and sealing joints are arranged on the outer side face of the female die corresponding to the positions of water outlets of the water passing grooves.

5. The powder metallurgy rotor-type forming die structure according to claim 1, wherein: the outer contour of the lower punch is circular, the inner cavity of the lower punch is a cycloid cavity, the circular effective section of the outer contour is 25-45 mm, the radial manufacturing precision is +/-0.003 mm, the effective section of the inner cavity is 45-60 mm, the radial manufacturing precision is +/-0.003 mm, an axial strip-shaped non-penetrating flat groove is formed in the outer contour, the width of the flat groove is 5-15 mm, the length of the flat groove is 10-30 mm, and the depth of the flat groove is 0.15-0.5 mm.

6. The powder metallurgy rotor-type forming die structure according to claim 1, wherein: the mandrel comprises a mandrel effective section and a mandrel connecting rod, wherein the length of the cycloidal outline effective section of the mandrel effective section is 80-120 mm, the radial manufacturing precision is +/-0.003 mm, the length of the inner cavity effective section is 100-150 mm, and the radial manufacturing precision is +/-0.005 mm.

7. The powder metallurgy rotor-type forming die structure according to claim 1, wherein: the bottom plate of the core rod accessory is a circular flat plate, four semicircular notches are concavely arranged on the periphery of the bottom plate, a circular step through hole in clearance fit with the positioning rod is formed in the center eccentric position of the bottom plate, and correspondingly, a through hole for the positioning rod to penetrate through is formed in the piston structure of the central cylinder.

8. The powder metallurgy rotor-like forming die structure of claim 7, wherein: the positioning rod is a cylinder with steps, the length of the positioning rod is 90 mm-110 mm, the tolerance is +/-0.1 mm, the diameter is 10 mm-15 mm, the outer diameter of the step cylinder is 10 mm-20 mm, and the thickness is 5 mm-10 mm.

Images