Die system for manufacturing differential shell

Abstract

The die system comprises a pre-forging assembly and a finish-forging assembly, the pre-forging assembly comprises a first lower die and a first upper die, and a pre-forging cavity is defined by the first upper die and the first lower die; the finish forging assembly comprises a second lower die and a second upper die, and a finish forging cavity is defined by the second upper die and the second lower die. The height of the parting surface of the pre-forging assembly is a first height H1, the height of the parting surface of the finish-forging assembly is a second height H2, and the first height H1 is greater than the second height H2; the diameter of the outer circle of the pre-forging cavity at the parting surface is a first diameter D1, the diameter of the outer circle of the finish-forging cavity at the parting surface is a second diameter D2, and the first diameter D1 is smaller than the second diameter D2. When the device is used for preparing the differential shell, no redundant waste flows out of the pre-forging cavity, and the finish-forging cavity can be conveniently filled, so that a finished product can be prevented from generating flashes and burrs, the processes of removing the flashes, removing the burrs and the like do not need to be carried out, the preparation time is shortened, and the preparation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts preparation, and particularly relates to a die system for preparing a differential housing. BACKGROUND

[0002] When the automobile is running in a straight line, the differential is a whole, and the several gears inside rotate with the differential. There is no relative motion between the gears and the housing. When the automobile turns or runs on a rugged road, the wheels on the left and right sides have a speed difference. In this case, the gears have relative motion with the differential housing, and the gears have friction with the differential housing. The differential housing has the following functions: 1, protecting the differential; 2, keeping the differential ventilated and heat dissipated; 3, keeping the transmission line of the differential and the rear axle drive unchanged.

[0003] Most of the differential housings are formed by casting, which greatly saves raw materials and mechanical processing. With the increasing road passability requirement of the automobile, especially the passability of off-road vehicles, the mechanical properties of the castings cannot meet the use requirements. The differential housing of the automobile begins to use forgings to meet the high passability requirement. In the existing forging process: blanking - heating - blank making - closed forging / open forging - removing residual flash. The die used in this process is usually a one-time forming die. However, the product precision prepared by the one-time forming die is not enough, and additional processes such as removing flash and removing burrs are needed, which makes the preparation time longer and the preparation effect worse. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a die system for preparing a differential housing, which does not need to additionally increase processes such as removing flash and removing burrs when preparing the differential housing, reduces the preparation time, and improves the preparation effect.

[0005] To this end, the present application provides a die system for preparing a differential housing, which comprises: a pre-forging assembly comprising a first lower die and a first upper die, the first upper die and the first lower die surrounding a pre-forging chamber; a finish-forging assembly comprising a second lower die and a second upper die, the second upper die and the second lower die surrounding a finish-forging chamber; the height of the parting surface of the pre-forging assembly is a first height H1, the height of the parting surface of the finish-forging assembly is a second height H2, the first height H1 is greater than the second height H2; the outer circle diameter of the pre-forging chamber at the parting surface is a first diameter D1, and the outer circle diameter of the finish-forging chamber at the parting surface is a second diameter D2, the first diameter D1 is less than the second diameter D2.

[0006] In one possible implementation, the height difference between the first height H1 and the second height H2 is 3mm-5mm.

[0007] In a possible implementation, the size difference between the first diameter D1 and the second diameter D2 is 4-5 mm.

[0008] In a possible implementation, the first upper die comprises a first die seat and a first die core, the first die seat is provided with a first mounting groove matched with the first die core, the first die core is located in the first mounting groove and protrudes from one side of the first die seat towards the first lower die, and / or the second upper die comprises a second die seat and a second die core, the second die seat is provided with a second mounting groove matched with the second die core, the second die core is located in the second mounting groove and protrudes from one side of the second die seat towards the second lower die.

[0009] In a possible implementation, the first lower die is provided with a first ejection hole, and / or the second lower die is provided with a second ejection hole.

[0010] In a possible implementation, when the first die core is located in the first lower die, the distance between the first die core and the first ejection hole is a first distance D3, when the second die core is located in the second lower die, the distance between the second die core and the second ejection hole is a second distance D4, and the first distance D3 is greater than the second distance D4.

[0011] In a possible implementation, the distance difference between the first distance D3 and the second distance D4 is 4-5 mm.

[0012] In a possible implementation, one side of the second die seat towards the second lower die is provided with a first positioning part, one side of the second lower die towards the second die seat is provided with a second positioning part, and the first positioning part and the second positioning part are clamped together.

[0013] In a possible implementation, the width of the first positioning part gradually decreases in the direction towards the second positioning part, and the width of the second positioning part gradually increases in the direction towards the first positioning part.

[0014] In a possible implementation, the first positioning part is annularly arranged and surrounds the finish-forging chamber, and the second positioning part is annularly arranged and surrounds the finish-forging chamber.

[0015] The mold system for manufacturing the differential housing provided by the embodiment of the present application comprises a pre-forging assembly and a finish-forging assembly, the pre-forging assembly comprises a first lower die and a first upper die, and the first upper die and the first lower die surround to form a pre-forging chamber; the finish-forging assembly comprises a second lower die and a second upper die, and the second upper die and the second lower die surround to form a finish-forging chamber; the height of the parting surface of the pre-forging assembly is a first height H1, the height of the parting surface of the finish-forging assembly is a second height H2, the first height H1 is greater than the second height H2; the outer circle diameter of the pre-forging chamber at the parting surface is a first diameter D1, and the outer circle diameter of the finish-forging chamber at the parting surface is a second diameter D2, and the first diameter D1 is less than the second diameter D2. When the differential housing is manufactured, no extra waste flows out of the pre-forging chamber, and the finish-forging chamber is filled conveniently, that is, the upper end of the pre-product is subjected to secondary forming in the finish-forging chamber, so that burrs and burrs of the finished product can be avoided, and processes such as removing burrs and removing burrs are not needed, the manufacturing time is reduced, and the manufacturing effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. In addition, the same components are marked with the same reference numerals in the drawings, and the drawings are not drawn according to the actual proportion.

[0017] Figure 1 A structure schematic diagram of a pre-forging assembly provided by the embodiment of the present application is shown;

[0018] Figure 2 An explosion view of a pre-forging assembly provided by the embodiment of the present application is shown;

[0019] Figure 3 A structure schematic diagram of a finish-forging assembly provided by the embodiment of the present application is shown;

[0020] Figure 4 An explosion view of a finish-forging assembly provided by the embodiment of the present application is shown;

[0021] Figure 5 A structure schematic diagram of a finished product provided by the embodiment of the present application is shown.

[0022] Explanation of reference numerals:

[0023] 1, pre-forging assembly; 11, first lower die; 111, first ejection hole; 12, first upper die; 121, first die seat; 1211, first mounting groove; 122, first die core; 13, pre-forging chamber; 2, finish-forging assembly; 21, second lower die; 211, second ejection hole; 212, second positioning part; 22, second upper die; 221, second die seat; 2211, second mounting groove; 2212, first positioning part; 222, second die core; 23, finish-forging chamber; 3, finished product. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] The differential housing is mostly formed by casting, which greatly saves raw materials and machining. With the increasing passing requirements of automobiles on the road, especially the passing requirements of off-road vehicles, the mechanical properties of the castings cannot meet the use requirements. The differential housing of the automobile begins to use forgings to meet the high passing requirements. In the existing forging process: blanking--heating--billet making--closed forging / open forging--removing residual flash. The die used in this process is usually a one-time forming die. However, the product precision prepared by the one-time forming die is not enough, and additional processes such as removing flash and removing burrs are needed, which makes the preparation time longer and the preparation effect poor.

[0026] In order to solve the above problems, with reference to Figures 1-5 , Figure 1 a structure schematic diagram of a pre-forging assembly provided by an embodiment of the present application is shown, Figure 2 an exploded view of the pre-forging assembly provided by the embodiment of the present application is shown, Figure 3 a structure schematic diagram of a finish-forging assembly provided by an embodiment of the present application is shown, Figure 4 an exploded view of the finish-forging assembly provided by the embodiment of the present application is shown, Figure 5 a structure schematic diagram of a finished product provided by an embodiment of the present application is shown.

[0027] The application provides a die system for preparing a differential housing, the die system for preparing the differential housing comprising a pre-forging assembly 1 and a finish-forging assembly 2, the pre-forging assembly 1 comprising a first lower die 11 and a first upper die 12, the first upper die 12 and the first lower die 11 surrounding a pre-forging cavity 13; the finish-forging assembly 2 comprising a second lower die 21 and a second upper die 22, the second upper die 22 and the second lower die 21 surrounding a finish-forging cavity 23; the height of the parting surface of the pre-forging assembly 1 being a first height H1, the height of the parting surface of the finish-forging assembly 2 being a second height H2, the first height H1 being greater than the second height H2; the outer circle diameter of the pre-forging cavity 13 at the parting surface being a first diameter D1, the outer circle diameter of the finish-forging cavity 23 at the parting surface being a second diameter D2, the first diameter D1 being smaller than the second diameter D2.

[0028] The first upper die 12 and the first lower die 11 surround the pre-forging cavity 13, at this time, the first upper die 12 is in close contact with the first lower die 11, so that there is no gap between the first upper die 12 and the first lower die 11, and a pre-product 3 can be formed in the pre-forging cavity 13, and the forming amount of the pre-product 3 is 90% of the product. The second upper die 22 and the second lower die 21 surround the finish-forging cavity 23, at this time, the second upper die 22 is in close contact with the second lower die 21, so that there is no gap between the second upper die 22 and the second lower die 21, and after the pre-product 3 is prepared, the pre-product 3 is placed in the finish-forging cavity 23 for secondary forming, thereby forming the product. Since the first height H1 is greater than the second height H2, and the first diameter D1 is smaller than the second diameter D2, during preparation, no excess waste flows out of the pre-forging cavity 13, and the finish-forging cavity 23 is filled, that is, the upper end of the pre-product 3 is subjected to secondary forming in the finish-forging cavity 23, thereby avoiding the generation of flash and burrs of the product 3, and the processes of removing flash and burrs are not required, the preparation time is reduced, and the preparation effect is improved.

[0029] In some optional embodiments, the height difference between the first height H1 and the second height H2 is 3mm-5mm. The height difference between the first height H1 and the second height H2 can be 3mm, 4mm or 5mm, and the application does not make any limitation. In one example, the first height H1 is 12mm, and the second height H2 is 9mm.

[0030] In some optional embodiments, the size difference between the first diameter D1 and the second diameter D2 is 4mm-5mm. The size difference between the first diameter D1 and the second diameter D2 can be 4mm, 4.5mm or 5mm, and the application does not make any limitation.

[0031] In some optional embodiments, the first upper die 12 comprises a first die seat 121 and a first die core 122, the first die seat 121 is provided with a first mounting groove 1211 adapted to the first die core 122, the first die core 122 is located in the first mounting groove 1211 and protrudes from a side of the first die seat 121 facing the first lower die 11. The first upper die 12 is provided with the first mounting groove 1211, the first mounting groove 1211 penetrates the first upper die 12 along the height direction of the first upper die 12, the first die core 122 is located in the first mounting groove 1211, and a first limiting groove is arranged above the first mounting groove 1211, the groove diameter of the first limiting groove is greater than the groove diameter of the first mounting groove, and a first limiting portion is arranged above the first die core 122, the diameter of the first limiting portion is greater than the diameter of the first die core 122, so as to avoid the first die core 122 from falling downward from the first mounting groove 1211. The gap fit between the first die seat 121 and the first die core 122 is 0.05mm. The lower end of the first die core 122 protrudes from the lower plane of the first die seat 121, so as to facilitate the first die core 122 to extend into the first lower die 11. The first die seat 121 and the first die core 122 are separately prepared, which can reduce the preparation difficulty of the first upper die 12, can reduce the material cost during preparation of the first upper die 12, and when the first die core 122 is worn, the first die core 122 can be replaced, thereby reducing the maintenance cost of the first upper die 12.

[0032] In some optional embodiments, the second upper die 22 comprises a second die seat 221 and a second die core 222, the second die seat 221 is provided with a second mounting groove 2211 adapted to the second die core 222, the second die core 222 is located in the second mounting groove 2211 and protrudes from a side of the second die seat 221 facing the second lower die 21. The second upper die 22 is provided with the second mounting groove 2211, the second mounting groove 2211 penetrates the second upper die 22 along the height direction of the second upper die 22, the second die core 222 is located in the second mounting groove 2211, and a second limiting groove is arranged above the second mounting groove 2211, the groove diameter of the second limiting groove is greater than the groove diameter of the first mounting groove, and a second limiting portion is arranged above the second die core 222, the diameter of the second limiting portion is greater than the diameter of the second die core 222, so as to avoid the second die core 222 from falling downward from the second mounting groove 2211. The gap fit between the second die seat 221 and the second die core 222 is 0.05mm. The lower end of the second die core 222 protrudes from the lower plane of the second die seat 221, so as to facilitate the second die core 222 to extend into the second lower die 21. The second die seat 221 and the second die core 222 are separately prepared, which can reduce the preparation difficulty of the second upper die 22, can reduce the material cost during preparation of the second upper die 22, and when the second die core 222 is worn, the second die core 222 can be replaced, thereby reducing the maintenance cost of the second upper die 22.

[0033] In some optional embodiments, the first lower die 11 is provided with a first ejection hole 111 which is in communication with the inner cavity of the first lower die 11, so as to facilitate the ejection of the pre-product 3 and facilitate the taking out of the pre-product 3.

[0034] In some optional embodiments, the second lower die 21 is provided with a second ejection hole 211 which is in communication with the inner cavity of the second lower die 21, so as to facilitate the ejection of the product 3 and facilitate the taking out of the product 3.

[0035] In some optional embodiments, when the first mold core 122 is located in the first lower die 11, the distance between the first mold core 122 and the first ejection hole 111 is a first distance D3, and when the second mold core 222 is located in the second lower die 21, the distance between the second mold core 222 and the second ejection hole 211 is a second distance D4, and the first distance D3 is greater than the second distance D4. That is, the thickness of the pre-product 3 at the punching position in the final forging chamber 23 becomes smaller, thereby facilitating the punching of the product 3.

[0036] In some optional embodiments, the distance difference between the first distance D3 and the second distance D4 is 4mm-5mm. In some optional embodiments, the distance difference between the first distance D3 and the second distance D4 is 4mm, 4.5mm or 5mm. In one example, the first mold core 122 protrudes from the first mounting groove 1211 by a length of 15.4mm, the first distance D3 is 8.3mm, the second mold core 222 protrudes from the second mounting groove 2211 by a length of 115.7, and the second distance D4 is 4mm.

[0037] Referring to Figure 3 and Figure 4 In some optional embodiments, the second mold seat 221 is provided with a first positioning portion 2212 on the side facing the second lower die 21, and the second lower die 21 is provided with a second positioning portion 212 on the side facing the second mold seat 221, and the first positioning portion 2212 and the second positioning portion 212 are clamped together. That is, either the first positioning portion 2212 or the second positioning portion 212 is a protrusion, and the other is a groove matched with the protrusion, and when the first positioning portion 2212 and the second positioning portion 212 are clamped together, the protrusion is located in the groove. In one example, the first positioning portion 2212 is a protrusion, and the second positioning portion 212 is a groove. The arrangement of the first positioning portion 2212 and the second positioning portion 212 avoids the left-right displacement between the second mold seat 221 and the second lower die 21, thereby improving the forging precision of the product.

[0038] In some optional embodiments, the first positioning portion 2212 gradually decreases in width in the direction towards the second positioning portion 212, and the second positioning portion 212 gradually increases in width in the direction towards the first positioning portion 2212. At this time, the first positioning portion 2212 is a protrusion, and the second positioning portion 212 is a groove, and the width of the first positioning portion 2212 and the width of the second positioning portion 212 are set to facilitate the convenience and accuracy of the engagement of the first positioning portion 2212 and the second positioning portion 212.

[0039] In some optional embodiments, the first positioning portion 2212 is annularly arranged and surrounds the finish forging chamber 23, and the second positioning portion 212 is annularly arranged and surrounds the finish forging chamber 23. Thus, the stability and convenience of the installation between the second die holder 221 and the second lower die 21 are improved.

[0040] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", and the like, in the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrases "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily referring to the same embodiment. Further, the particular features, structures, or characteristics can be implemented in both the described embodiment and in other embodiments.

[0041] It should be readily understood that the terms "on", "above", and "on top of" in the present disclosure are to be interpreted in the broadest context, such that "on" means not only "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "above" or "on top of" includes not only the meaning of "above" or "on top of", but also the meaning of "above" or "on top of" without intermediate features or layers therebetween (i.e., directly on).

[0042] In addition, spatially relative terms, such as "under", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0043] It should be noted that, in the present document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0044] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A mold system for manufacturing a differential housing, characterized in that, include: The pre-forging assembly includes a first lower die and a first upper die, wherein the first upper die and the first lower die form a pre-forging chamber. The final forging assembly includes a second lower die and a second upper die, wherein the second upper die and the second lower die surround and form a final forging chamber; The height of the parting surface of the pre-forging component is a first height H1, and the height of the parting surface of the final forging component is a second height H2, wherein the first height H1 is greater than the second height H2; The outer diameter of the pre-forging chamber at the parting surface is a first diameter D1, and the outer diameter of the final forging chamber at the parting surface is a second diameter D2. The first diameter D1 is smaller than the second diameter D2.

2. The mold system for manufacturing a differential housing according to claim 1, characterized in that, The height difference between the first height H1 and the second height H2 is 3mm-5mm.

3. The mold system for manufacturing a differential housing according to claim 1, characterized in that, The size difference between the first diameter D1 and the second diameter D2 is 4mm-5mm.

4. The mold system for manufacturing a differential housing according to claim 1, characterized in that, The first upper mold includes a first mold base and a first mold core. The first mold base is provided with a first mounting groove adapted to the first mold core. The first mold core is located in the first mounting groove and protrudes from the side of the first mold base facing the first lower mold. And / or, the second upper mold includes a second mold base and a second mold core. The second mold base is provided with a second mounting groove adapted to the second mold core. The second mold core is located in the second mounting groove and protrudes from the side of the second mold base facing the second lower mold.

5. The mold system for manufacturing a differential housing according to claim 4, characterized in that, The first lower mold is provided with a first ejector hole, and / or the second lower mold is provided with a second ejector hole.

6. The mold system for manufacturing a differential housing according to claim 5, characterized in that, When the first mold core is located in the first lower mold, the distance between the first mold core and the first ejector hole is a first distance D3. When the second mold core is located in the second lower mold, the distance between the second mold core and the second ejector hole is a second distance D4. The first distance D3 is greater than the second distance D4.

7. The mold system for manufacturing a differential housing according to claim 6, characterized in that, The distance difference between the first distance D3 and the second distance D4 is 4mm-5mm.

8. The mold system for manufacturing a differential housing according to claim 4, characterized in that, The second mold base has a first positioning part on the side facing the second lower mold, and the second lower mold has a second positioning part on the side facing the second mold base. The first positioning part engages with the second positioning part.

9. The mold system for manufacturing a differential housing according to claim 8, characterized in that, The width of the first positioning part gradually decreases in the direction toward the second positioning part, while the width of the second positioning part gradually increases in the direction toward the first positioning part.

10. The mold system for manufacturing a differential housing according to claim 8, characterized in that, The first positioning part is arranged in a ring and surrounds the final forging chamber, and the second positioning part is arranged in a ring and surrounds the final forging chamber.

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