CN212857580U - Differential bevel gear upsetting-extruding and back pressure composite forming die - Google Patents
Differential bevel gear upsetting-extruding and back pressure composite forming die Download PDFInfo
- Publication number
- CN212857580U CN212857580U CN202020881765.1U CN202020881765U CN212857580U CN 212857580 U CN212857580 U CN 212857580U CN 202020881765 U CN202020881765 U CN 202020881765U CN 212857580 U CN212857580 U CN 212857580U
- Authority
- CN
- China
- Prior art keywords
- die
- cushion block
- mounting hole
- cavity
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Forging (AREA)
Abstract
The utility model provides a differential bevel gear upsetting-extruding and back pressure composite forming die, which relates to the field of mechanical manufacturing, and comprises an upper die consisting of an upper ejector rod and a tooth die, and a lower die consisting of a lower cavity die, a lower ejector rod, a first cushion block, a second cushion block, a back pressure structure, a base and a lower ejector rod, wherein the upper die and the lower die are arranged along the same central axis; the back pressure structure comprises an elastic element, and is used for floating the lower cavity die up and down by a certain fall stroke to facilitate accurate positioning of a blank on one hand, and generating a back pressure by the force of the lower cavity die acting on the back pressure structure to act on the blank in a reverse direction when the die is closed and upset on the other hand, so that the plasticity and metal fluidity of the blank are improved; the utility model discloses help differential mechanism bevel gear blank one shot forming when cold extrusion to improve forming die's life-span.
Description
Technical Field
The utility model relates to a machine-building technical field, concretely relates to differential mechanism bevel gear is upset crowded and compound forming die of backpressure.
Background
In a cold extrusion forming process, the differential bevel gear is directly formed by upsetting and extruding, the process requirements are difficult to meet at one time in actual production, and the service life of a forming die is short due to factors such as impact of forging pressure, stress concentration and the like. In order to achieve the purpose that the cold extrusion one-step forming of the bevel gear of the differential gear achieves the process requirements and prolongs the service life of a die, a preforming process is usually added before the cold extrusion, and the blank after blank ejection and preforming is subjected to annealing, sand blasting, surface lubrication treatment and finally extrusion forming. The differential bevel gear is produced by extrusion through the process, the process is complex and various, and the service life of the die is short. Therefore, a forming mold with simple process and convenient operation is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a differential mechanism bevel gear is upset crowded and compound forming die of backpressure, and this mould can realize the accurate location of blank when differential mechanism bevel gear takes shape, improves the plasticity and the metal mobility of material, once takes shape when making blank cold extrusion.
To achieve the above objective, the present invention provides the following technical solutions: a differential bevel gear upsetting-extruding and back pressure composite forming die is defined to be divided into an upper die and a lower die by taking a die cavity parting surface as a boundary; the upper die comprises an upper ejector rod and a tooth die, and the lower die comprises a lower cavity die, a lower ejector rod, a first cushion block, a second cushion block, a backpressure structure, a base and a lower ejector rod;
the lower bottom surface of the tooth mold is provided with a tooth mold cavity with a downward opening, and the tooth mold cavity is provided with a first mounting hole penetrating to the upper bottom surface of the tooth mold upwards along the central axis of the tooth mold cavity; the first mounting hole is a primary stepped hole, and the aperture of the primary stepped hole close to the tooth model cavity side is smaller than the aperture of the primary stepped hole far away from the tooth model cavity side; the upper material pushing rod is installed in the first installation hole in an adaptive mode, and at most part of the end part, close to the tooth model cavity, of the upper material pushing rod extends into the tooth model cavity;
the upper bottom surface of the lower cavity die is provided with a concave die cavity with an upward opening, the concave die cavity is matched with the tooth die cavity, and the central axis of the concave die cavity is superposed with the central axis of the tooth die cavity; the female die cavity is downwards provided with a second mounting hole penetrating to the lower bottom surface of the lower die cavity along the central axis of the female die cavity; the second mounting hole is a primary stepped hole, and the aperture of the primary stepped hole close to the concave model cavity side is smaller than the aperture of the primary stepped hole far away from the tooth model cavity side; the lower ejection rod is arranged in the second mounting hole;
the first cushion block is arranged below the lower cavity die and is provided with a third mounting hole penetrating from the lower bottom surface to the upper bottom surface; the third mounting hole and the second mounting hole are coaxial holes, and the aperture of the third mounting hole is larger than that of the second mounting hole;
the base is arranged below the first cushion block, and the upper bottom surface of the base abuts against the lower bottom surface of the first cushion block; a fourth mounting hole penetrating from the lower bottom surface to the upper bottom surface of the base is formed in the base, the fourth mounting hole and the third mounting hole are coaxial holes, and the aperture of the third mounting hole is larger than that of the fourth mounting hole; the fourth mounting hole is a first-stage stepped hole, and the aperture of the first-stage stepped hole close to the first cushion block side is larger than the aperture of the first-stage stepped hole far away from the first cushion block side; the lower ejector rod is installed in the fourth installation hole in an adaptive mode, and at most part of the end part, close to the first cushion block, of the lower ejector rod extends into the third installation hole;
the second cushion block is arranged in the third mounting hole, the upper bottom surface of the second cushion block abuts against the lower bottom surface of the lower ejector rod, the lower bottom surface of the second cushion block abuts against the upper bottom surface of the lower ejector rod, and the central axis of the second cushion block along the vertical direction is superposed with the central axis of the third mounting hole;
the backpressure structure comprises an elastic element and a third cushion block, the elastic element is arranged between the second cushion block and the third mounting hole, the lower end face of the elastic element is abutted against the upper bottom face of the base, and the elastic element has a tendency of deformation along the direction of the central axis of the third mounting hole; the third cushion block is sleeved on the second cushion block, the lower bottom surface of the third cushion block props against the upper end surface of the elastic element, and the upper bottom surface of the third cushion block props against the lower bottom surface of the lower cavity die;
the elastic element at least has a first compression state and a second compression state in the third mounting hole, the first compression state is that the elastic element acts on the third cushion block to enable the upper bottom surface of the lower cavity die and the upper bottom surface of the lower ejection rod to have a non-zero fall stroke, and the second compression state is that the lower cavity die presses the elastic element downwards until the lower bottom surface of the elastic element abuts against the upper bottom surface of the first cushion block.
Furthermore, the lower ejector rod is of a primary step shaft type structure, the aperture of a shaft section of the primary step shaft type structure close to the side of the cavity of the female die is smaller than the aperture of a shaft section of the primary step shaft type structure far away from the side of the cavity of the female die, and round corner transition is adopted between two shaft sections of the primary step shaft type structure, so that stress concentration on the lower ejector rod during upsetting and extrusion is avoided.
Further, the height of the first cushion block in the vertical direction is defined as H1, the height of the second cushion block in the vertical direction is defined as H2, the height of the lower cavity die in the vertical direction is defined as H3, the height of the lower cavity die cavity in the vertical direction is defined as H4, and the height of the lower ejector rod in the vertical direction is defined as H5, so that H1 is defined as H2, and H5 is defined as H3-H4.
Furthermore, the elastic element is a disc spring assembly, the disc springs are coaxially arranged and have the same size, and the disc spring assembly is sleeved on the second cushion block. The third mounting hole is a cylindrical hole, the outer circumference of the disc spring combination is in clearance fit with the third mounting hole, and the single-side fit clearance is 1-1.5 mm.
Furthermore, the second cushion block is arranged into a first cylindrical structure, and the inner hole of the disc spring combination is in clearance fit with the outer circumference of the first cylindrical structure; the first cushion block is arranged to be of a second cylindrical structure with a first central through hole, and the first central through hole is a third mounting hole; the third cushion block is arranged to be a third cylindrical structure with a second central through hole, the outer circumference of the third cylindrical structure is in clearance fit with the third mounting hole, and the second central through hole of the third cylindrical structure is in clearance fit with the outer circumference of the first cylindrical structure.
Further, when the elastic element is in a first compression state, the fall stroke between the upper bottom surface of the lower cavity die and the upper bottom surface of the lower ejection rod is defined as X; and defining the maximum compression amount of the elastic element as G, and ensuring that the compression deformation of the elastic element is in a restorable range to prevent the elastic element from failing if X is 75% G.
According to the technical scheme provided by the utility model, the differential mechanism bevel gear jolt who technical scheme provides extrudees and the compound forming die of backpressure has obtained following beneficial effect:
the utility model discloses a differential bevel gear upsetting-extruding and back pressure composite forming die, which has simple structure and reasonable configuration, and comprises an upper die consisting of an upper ejector rod and a tooth die, and a lower die consisting of a lower cavity die, a lower ejector rod, a first cushion block, a second cushion block, a back pressure structure, a base and a lower ejector rod, wherein the upper die and the lower die are arranged along the same central axis; the back pressure structure comprises an elastic element and a third cushion block, the elastic element is always in a compression state, namely the elastic element is abutted to the lower cavity die through the third cushion block, on one hand, the elastic element is used for enabling the lower cavity die to float up and push out the lower cavity die by a certain fall stroke through the third cushion block before die assembly, so that accurate positioning when a blank is thrown into the cavity of the concave die is facilitated, on the other hand, when the die assembly is upset and extruded, the elastic element enables the pressure of the lower cavity die acting on the third cushion block to reversely generate back pressure and act on the blank, the plasticity and metal fluidity of the blank are improved, one-step forming of the differential bevel gear blank during cold extrusion is facilitated, meanwhile, the influence of forging pressure on the upper die and the lower die during upset and extrusion can be reduced, and.
In addition, the disk spring combination is selected as the elastic element to provide the upper buoyancy and the back pressure and is arranged in the central through hole of the first cushion block, so that the axial space occupied in the lower die is small, and the acting force is uniform; in addition, the disc spring is a standard component, and is convenient to replace and select in use.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural section view of a differential bevel gear upsetting-extruding and back pressure composite forming die of the present invention;
FIG. 2 is a top view of the lower knockout rod of FIG. 1;
FIG. 3 is a cross-sectional view of the lower knock-out bar of FIG. 1;
FIG. 4 is a top view of the first head block of FIG. 1;
FIG. 5 is a cross-sectional view of the first spacer of FIG. 1;
FIG. 6 is a top view of the second head block of FIG. 1;
FIG. 7 is a cross-sectional view of the second spacer of FIG. 1;
FIG. 8 is a top view of the elastomeric member of FIG. 1;
FIG. 9 is a cross-sectional view of the resilient member of FIG. 1;
FIG. 10 is a top view of the third head block of FIG. 1;
FIG. 11 is a cross-sectional view of the third block of FIG. 1;
in the figure, the specific meaning of each mark is:
1-upper ejector rod, 2-tooth mold, 3-lower cavity mold, 4-lower ejector rod, 5-first cushion block, 6-second cushion block, 7-elastic element, 8-third cushion block, 9-base, 10-lower ejector rod, and 11-blank.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "upper", "lower", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly.
Direct upsetting-extruding forming is adopted in the process of forming the differential bevel gear based on cold extrusion in the prior art, upsetting-extruding forming cannot be performed at one time in actual production, and the service life of a forming die is short due to the existence of forging pressure; the existing improvement process is complex and not beneficial to improving the production efficiency of the differential bevel gear. The utility model aims at providing a differential mechanism bevel gear is upset crowdedly with the compound forming die of backpressure, through the accurate location to the blank before the shaping, improves the plasticity and the metal mobility of material, once takes shape when making blank cold extrusion, improves forming die's life simultaneously.
The differential bevel gear upsetting-extruding and back-pressure composite forming die of the present invention will be further described in detail with reference to the embodiments shown in the drawings.
Referring to fig. 1, a differential bevel gear upsetting-extruding and back-pressure composite forming die is defined to be divided into an upper die and a lower die by taking a die cavity parting surface as a boundary, wherein the upper die comprises an upper ejector rod 1 and a tooth die 2, the lower die comprises a lower die cavity die 3, a lower ejector rod 4, a first cushion block 5, a second cushion block 6, a back-pressure structure, a base 9 and a lower ejector rod 10, and the upper die and the lower die are assembled on a die frame in specific implementation; the back pressure structure in the lower die provides a positioning point for fixing the blank 11 on one hand, and provides back pressure towards the upper die on the other hand and acts on the blank 11; the utility model discloses a forming die has and helps differential bevel gear blank 11 once take shape when cold extrusion to effective increase of service life.
Specifically, a tooth model cavity with a downward opening is arranged on the lower bottom surface of the tooth model 2, and a first mounting hole penetrating through the upper bottom surface of the tooth model 2 is formed in the tooth model cavity upwards along the central axis of the tooth model cavity; the first mounting hole is a first-stage stepped hole, and the aperture of the first-stage stepped hole close to the tooth model cavity side is smaller than the aperture of the first-stage stepped hole far away from the tooth model cavity side; the upper material jacking rod 1 is installed in the first installation hole in a matched mode, at most part of the end portion, close to the tooth model cavity, of the upper material jacking rod 1 extends into the tooth model cavity, and the upper material jacking rod 1 is used for enabling the differential bevel gear subjected to upsetting-extrusion forming to be separated from the tooth model cavity. The upper bottom surface of the lower cavity die 3 is provided with a concave die cavity with an upward opening, the concave die cavity is matched with the tooth die cavity, and the central axis of the concave die cavity is coincided with the central axis of the tooth die cavity. The die cavity is provided with a second mounting hole which penetrates through the lower bottom surface of the lower cavity die 3 downwards along the central axis of the die cavity, the second mounting hole is a first-stage step hole, the aperture of the first-stage step hole close to the side of the die cavity is smaller than the aperture of the first-stage step hole far away from the side of the tooth die cavity, and the lower ejector rod 4 is mounted in the second mounting hole. Further, if the height of the lower cavity mold 3 in the vertical direction is defined as H3, the height of the cavity mold provided in the lower cavity mold 3 in the vertical direction is defined as H4, and the height of the lower ejector pin 4 in the vertical direction is defined as H5, then H5 is H3-H4, that is, when the lower ejector pin 4 and the lower bottom surface of the lower cavity mold 3 are at the same level, the lower ejector pin 4 does not protrude into the cavity mold.
With reference to fig. 1, 2 and 3, the lower ejector rod 4 is configured as a one-step shaft-type structure, the aperture of the one-step shaft-type structure near the shaft section of the concave mold cavity side is smaller than the aperture of the one-step shaft-type structure far away from the shaft section of the concave mold cavity side, and round corner transition is adopted between the two shaft sections of the one-step shaft-type structure. In the concrete implementation, because lower ejector pin 4 directly bears great pressure with the direct contact of blank 11, if directly adopt the right angle transition between the diaxon section of lower ejector pin 4, can take place stress concentration in the transition position, lead to lower ejector pin 4 rupture, fillet transition can avoid upsetting the stress concentration on the lower ejector pin 4 when crowded, improves the security of lower ejector pin 4.
Referring to fig. 1, 4 and 5, the first spacer 5 is disposed below the lower cavity mold 3, a third mounting hole is disposed on the first spacer 5 and penetrates from the lower bottom surface to the upper bottom surface of the first spacer, the third mounting hole and the second mounting hole are coaxial, and the aperture of the third mounting hole is larger than that of the second mounting hole. The base 9 is arranged below the first cushion block 5, and the upper bottom surface of the base 9 is abutted against the lower bottom surface of the first cushion block 5; the base 9 is provided with a fourth mounting hole penetrating from the lower bottom surface to the upper bottom surface thereof, the fourth mounting hole and the third mounting hole are coaxial holes, and the aperture of the third mounting hole is larger than that of the fourth mounting hole. The fourth mounting hole is a first-stage stepped hole, and the aperture of the first-stage stepped hole close to the first cushion block 5 side is larger than the aperture of the first-stage stepped hole far away from the first cushion block 5 side. The lower ejector rod 10 is installed in the fourth installation hole in a matched mode, and at most part of the end portion, close to the first cushion block 5, of the lower ejector rod 10 extends into the third installation hole. The first cushion block 5 is used as a main bearing element in the lower die and bears the pressure of the lower cavity die 3, and the base 9 and the lower ejector rod 10 are used for separating the differential bevel gear subjected to upsetting-extrusion forming from the cavity of the lower cavity die.
As shown in fig. 1, 6, and 7, the second pad 6 is disposed in the third mounting hole, the upper bottom surface of the second pad 6 abuts against the lower bottom surface of the lower ejector rod 4, the lower bottom surface of the second pad 6 abuts against the upper bottom surface of the lower ejector rod 10, and the central axis of the second pad 6 in the vertical direction coincides with the central axis of the third mounting hole. When the height of the first pad 5 in the vertical direction is defined as H1 and the height of the second pad 6 in the vertical direction is defined as H2, H1 is equal to H2, that is, the second pad 6 directly acts on the lower knock-out rod 4 to linearly transmit the pressure for forming the billet 11 in the central axis direction, so that the deflection dispersion of the force to the first pad 5 is avoided, the stress is not uniform during forming the billet 11, and the billet cannot be formed by upsetting and extruding at one time.
Referring to fig. 1 and 8 to 11, the back pressure structure includes an elastic element 7 and a third pad 8, the elastic element 7 is disposed between the second pad 6 and the third mounting hole, a lower end surface of the elastic element 7 abuts against an upper bottom surface of the base 9, and the elastic element 7 has a tendency of deforming along a central axis of the third mounting hole. The third cushion block 8 is sleeved on the second cushion block 6, the lower bottom surface of the third cushion block 8 props against the upper end surface of the elastic element 7, and the upper bottom surface of the third cushion block 8 props against the lower bottom surface of the lower cavity die 3; the elastic element 7 at least has a first compression state and a second compression state in the third mounting hole, the first compression state is that the elastic element 7 acts on the third cushion block 8 to enable the upper bottom surface of the lower cavity die 3 and the upper bottom surface of the lower ejector rod 4 to have a non-zero fall stroke, and the second compression state is that the lower cavity die 3 presses the elastic element 7 downwards until the lower bottom surface of the elastic element abuts against the upper bottom surface of the first cushion block 5.
When the elastic element 7 is in the first compression state, because a fall stroke exists between the upper bottom surface of the lower cavity die 3 and the upper bottom surface of the lower ejector rod 4, the lower ejector rod 4 has a certain spatial distance from the upper end surface of the second mounting hole, when a blank 11 is placed, the blank 11 can be placed in the cavity of the female die until part of the blank extends into the second mounting hole, and when the die is closed, the blank in the second mounting hole is ejected into the cavity of the female die through the lower ejector rod 4 and then is formed in the cavity of the tooth die by upsetting extrusion. When the elastic element 7 is in the second compression state, the amount of compression deformation of the elastic element 7 is larger, and a larger back pressure is generated in the axial direction along the central axis through the third cushion block 8 to reversely act on the blank deformation; the accurate positioning and back pressure effect during upsetting and extruding the blank 11 are beneficial to improving the plasticity and metal fluidity of the blank 11, promoting the one-step forming during cold extruding of the blank 11, and simultaneously, the reduction of upsetting and extruding times is also beneficial to improving the service life of a forming die.
In order to prevent elastic element 7 excessive pressure from leading to failing, in the utility model discloses in, set for when elastic element 7 is in first compression state, the head stroke between the bottom surface is X on lower die cavity mould 3 and on lower ejector pin 4, and elastic element 7's maximum compression volume is G, sets for X75% G, ensures elastic element 7 compression deformation throughout and is in the restorable within range promptly, as long as can ensure elastic element 7's deformation in the restorable within range, head stroke X also can choose other data for use. Of course, in the embodiment of the present invention, in order to prevent the elastic element 7 from failing, when the mold closing and upsetting are performed on the forming mold, the back pressure stroke of the press ram moving downward to the bottom dead center from the top dead center is equal to 75% of the maximum compression amount of the elastic element 7. At the moment, the back pressure of the lower cavity die 3 acting on the blank 11 reaches the set maximum value of the elastic element 7, the blank 11 is filled with the tooth die cavity and the female die cavity, the whole cold extrusion process is finished, then the slide block of the press returns to the top dead center, and the blank 11 is ejected out of the tooth die 2 by the upper ejector rod 1 after being formed according to the process requirements.
In the embodiment shown in the attached drawings, the elastic element 7 is a disc spring combination, the disc spring combination is a plurality of disc springs with the same size and coaxially arranged, and the disc springs are standard parts and are convenient to select. The axial space that the belleville spring combination took in the third mounting hole is not big to because belleville spring is the ring structure, can evenly apply force to third cushion 8 during deformation.
In order to ensure that the belleville spring combination is always kept on the same axis after being compressed and deformed, and no radial displacement occurs so that large deviation occurs when back pressure acts on the blank 11, in the embodiment, the second cushion block 6 is set to be of a first cylindrical structure, the first cushion block 5 is set to be of a second cylindrical structure with a first central through hole, and the third cushion block is set to be of a third cylindrical structure with a second central through hole, wherein the first central through hole is a third mounting hole and is a cylindrical hole. The disc spring combination is sleeved on the second cushion block 6, an inner hole of the disc spring combination is in clearance fit with the outer circumference of the first cylindrical structure, the outer circumference of the disc spring combination is in clearance fit with the third mounting hole, and the single-side fit clearance between the disc spring combination and the third mounting hole is 1-1.5 mm; meanwhile, the outer circumference of the third cylindrical structure is in clearance fit with the third mounting hole, and the second central through hole of the third cylindrical structure is in clearance fit with the outer circumference of the first cylindrical structure. The disc spring combination and the third mounting hole are provided with the matching gap, and the main purpose of the disc spring combination is to ensure that the diameter of the outer periphery of the disc spring combination is increased and the disc spring combination cannot interfere with the third mounting hole when the disc spring combination is deformed by pressure.
In some embodiments, a spring meeting the strength requirement of the cold extrusion process is directly selected as the elastic element 7, and the technical effect of the disc spring combination in the embodiments can also be achieved.
The utility model discloses a first cushion 5, second cushion 5, elastic element 7 and the 8 mating reaction of third cushion, atress when avoiding blank 11 to be extruded is uneven, ensures that blank 11 once takes shape when jolting up crowded to improve forming die's life, experimental data shows, the utility model discloses a differential mechanism bevel gear is upset crowded and is improved to more than one time with the life of the compound forming die of backpressure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (9)
1. A differential bevel gear upsetting-extruding and back pressure composite forming die is characterized in that an upper die and a lower die are defined and divided by taking a die cavity parting surface as a boundary; the upper die comprises an upper ejector rod and a tooth die, and the lower die comprises a lower cavity die, a lower ejector rod, a first cushion block, a second cushion block, a backpressure structure, a base and a lower ejector rod;
the lower bottom surface of the tooth mold is provided with a tooth mold cavity with a downward opening, and the tooth mold cavity is provided with a first mounting hole penetrating to the upper bottom surface of the tooth mold upwards along the central axis of the tooth mold cavity; the first mounting hole is a primary stepped hole, and the aperture of the primary stepped hole close to the tooth model cavity side is smaller than the aperture of the primary stepped hole far away from the tooth model cavity side; the upper material pushing rod is installed in the first installation hole in an adaptive mode, and at most part of the end part, close to the tooth model cavity, of the upper material pushing rod extends into the tooth model cavity;
the upper bottom surface of the lower cavity die is provided with a concave die cavity with an annular opening facing upwards, the concave die cavity is matched with the tooth die cavity, and the central axis of the concave die cavity is superposed with the central axis of the tooth die cavity; the female die cavity is downwards provided with a second mounting hole penetrating to the lower bottom surface of the lower die cavity along the central axis of the female die cavity; the second mounting hole is a primary stepped hole, and the aperture of the primary stepped hole close to the concave model cavity side is smaller than the aperture of the primary stepped hole far away from the tooth model cavity side; the lower ejection rod is arranged in the second mounting hole;
the first cushion block is arranged below the lower cavity die and is provided with a third mounting hole penetrating from the lower bottom surface to the upper bottom surface; the third mounting hole and the second mounting hole are coaxial holes, and the aperture of the third mounting hole is larger than that of the second mounting hole;
the base is arranged below the first cushion block, and the upper bottom surface of the base abuts against the lower bottom surface of the first cushion block; a fourth mounting hole penetrating from the lower bottom surface to the upper bottom surface of the base is formed in the base, the fourth mounting hole and the third mounting hole are coaxial holes, and the aperture of the fourth mounting hole is smaller than that of the third mounting hole; the fourth mounting hole is a first-stage stepped hole, and the aperture of the first-stage stepped hole close to the first cushion block side is larger than the aperture of the first-stage stepped hole far away from the first cushion block side; the lower ejector rod is installed in the fourth installation hole in an adaptive mode, and at most part of the end part, close to the first cushion block, of the lower ejector rod extends into the third installation hole;
the second cushion block is arranged in the third mounting hole, the upper bottom surface of the second cushion block abuts against the lower bottom surface of the lower ejector rod, the lower bottom surface of the second cushion block abuts against the upper bottom surface of the lower ejector rod, and the central axis of the second cushion block along the vertical direction is superposed with the central axis of the third mounting hole;
the backpressure structure comprises an elastic element and a third cushion block, the elastic element is arranged between the second cushion block and the third mounting hole, the lower end face of the elastic element is abutted against the upper bottom face of the base, and the elastic element has a tendency of deformation along the direction of the central axis of the third mounting hole; the third cushion block is sleeved on the second cushion block, the lower bottom surface of the third cushion block props against the upper end surface of the elastic element, and the upper bottom surface of the third cushion block props against the lower bottom surface of the lower cavity die;
the elastic element at least has a first compression state and a second compression state in the third mounting hole, the first compression state is that the elastic element acts on the third cushion block to enable the upper bottom surface of the lower cavity die and the upper bottom surface of the lower ejection rod to have a non-zero fall stroke, and the second compression state is that the lower cavity die presses the elastic element downwards until the lower bottom surface of the elastic element abuts against the upper bottom surface of the first cushion block.
2. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 1, wherein the lower ejector rod is provided as a primary stepped shaft structure, the bore diameter of a shaft section of the primary stepped shaft structure near the cavity side of the female die is smaller than the bore diameter of a shaft section of the primary stepped shaft structure far from the cavity side of the female die, and rounded corners are used for transition between the two shaft sections of the primary stepped shaft structure.
3. The differential bevel gear upsetting and back pressure compound forming die as claimed in claim 1, wherein the height of the first cushion block in the up-down direction is defined as H1, the height of the second cushion block in the up-down direction is defined as H2, the height of the lower cavity die in the up-down direction is defined as H3, the height of the cavity die of the lower cavity die in the up-down direction is defined as H4, and the height of the lower ejector rod in the up-down direction is defined as H5, so that H1 is H2, and H5 is H3-H4.
4. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 1, wherein said elastic element is a disc spring assembly, said disc spring assembly is a plurality of disc springs of the same size coaxially arranged, and said disc spring assembly is sleeved on the second cushion block.
5. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 4, wherein said third mounting hole is a cylindrical hole, and an outer circumference of said disc spring assembly is in clearance fit with said third mounting hole.
6. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 4, wherein the second cushion block is provided as a first cylindrical structure, and the inner hole of the disc spring combination is in clearance fit with the outer circumference of the first cylindrical structure.
7. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 5, wherein the single-side fit clearance of the outer circumference of the disc spring combination and the third mounting hole is 1mm to 1.5 mm.
8. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 1, wherein a drop stroke between an upper bottom surface of the lower cavity die and an upper bottom surface of the lower ejector rod is defined as X when the elastic member is in the first compression state; when the maximum compression amount of the elastic element is defined as G, X is 75% G.
9. The differential bevel gear upsetting and back pressure composite forming die as claimed in claim 6, wherein said first cushion block is provided as a second cylindrical structure having a first central through hole, said first central through hole being a third mounting hole; the third cushion block is arranged to be a third cylindrical structure with a second central through hole, the outer circumference of the third cylindrical structure is in clearance fit with the third mounting hole, and the second central through hole of the third cylindrical structure is in clearance fit with the outer circumference of the first cylindrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020881765.1U CN212857580U (en) | 2020-05-24 | 2020-05-24 | Differential bevel gear upsetting-extruding and back pressure composite forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020881765.1U CN212857580U (en) | 2020-05-24 | 2020-05-24 | Differential bevel gear upsetting-extruding and back pressure composite forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212857580U true CN212857580U (en) | 2021-04-02 |
Family
ID=75205643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020881765.1U Active CN212857580U (en) | 2020-05-24 | 2020-05-24 | Differential bevel gear upsetting-extruding and back pressure composite forming die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212857580U (en) |
-
2020
- 2020-05-24 CN CN202020881765.1U patent/CN212857580U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101767153B (en) | Composite forming die | |
| CN201711484U (en) | Precision forging mould for floating straight-tooth cylindrical gear | |
| CN110328315B (en) | Uniform upsetting method for non-anisotropic magnesium alloy bar | |
| CN110193578A (en) | The processing method of heavy truck high intensity cold-extruded cross axle non-trimming forging | |
| CN210412363U (en) | Piston head forging die with annular composite ejector rod mechanism | |
| CN201940433U (en) | Prestress extrusion die structure adopting steel wire winding | |
| CN108941233B (en) | Open internal type forward and backward extrusion composite die | |
| CN212857580U (en) | Differential bevel gear upsetting-extruding and back pressure composite forming die | |
| CN110328316A (en) | A kind of square plate casing forming mold and forming method | |
| CN111889531B (en) | Positive and negative extrusion forming die and forming method for curved bus type shell | |
| CN210498184U (en) | Ejection device suitable for automatic closed forging of steel piston | |
| CN1139027A (en) | Plastic working method of gear-type parts | |
| CN112756538A (en) | Near-net forming die and method for forging hinge beam of refined steel stone pressure equipment | |
| CN107335768B (en) | The small gear ring radial direction wedge pressure mould of combination gear | |
| CN213613907U (en) | Forging die of aluminum alloy wheel with concave wheel well portion | |
| CN107855455A (en) | A kind of magnet steel blank forming particular manufacturing craft | |
| CN212652630U (en) | Improved aluminum alloy hub forging die ejection structure | |
| CN210359086U (en) | Annular composite ejector rod mechanism | |
| CN108188325B (en) | Cold heading forming folding-preventing die for thin-wall workpiece | |
| CN210816889U (en) | Lateral tooth-extruding mechanism | |
| CN210497714U (en) | Forming die for machining square disc shell | |
| CN209867359U (en) | Chamfer gear powder metallurgy compacting die | |
| CN207735533U (en) | The conjunction gear precision forging die of built-in slow pressing structure | |
| CN214557384U (en) | Many stamping dies of carbide mushroom head shape dysmorphism piece pressed compact | |
| CN212703720U (en) | Cold extrusion demoulding and feeding device for bevel gear of differential mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |