Flange gear anti-cracking lower die and anti-cracking using method thereof

Abstract

The invention discloses a flange gear anti-cracking lower die and a manufacturing method thereof.The flange gear anti-cracking lower die comprises a lower die base, an anti-cracking outer sleeve and an inner core, the inner core is sleeved with the anti-cracking outer sleeve in a hot matching mode, the inner core and the anti-cracking outer sleeve are installed into a whole, the anti-cracking outer sleeve is detachably installed on the lower die base, and the outer sleeve is detachably installed on the lower die base. The die cavity in the bottom of the inner core corresponds to the die cavity in the lower die base in position, and a die cavity used for manufacturing a flange gear is further formed in the inner core. The tooth body contour of the flange gear is correspondingly processed at the die cavity in the inner core; firstly, when the inner core and the anti-cracking outer sleeve are installed in a butt joint mode, only the mold cavity is formed in the inner core, after installation, the tooth body contour can be correspondingly arranged, and the structure is more reasonable. The anti-cracking outer sleeve is arranged outside the inner core, a layer of wrapping force can be given through the anti-cracking outer sleeve when the inner core is expanded under pressure, so that cracking of the inner core is avoided, the structure is reasonable, the forming quality and efficiency of the mold are improved, and the mold is suitable for mass production.

Description

Technical Field

[0001] The invention relates to the technical field of gear manufacturing molds, in particular to a flange gear anti-cracking lower mold and an anti-cracking use method thereof. Background Art

[0002] like Figure 6 As shown, the structure of the existing flange gear is characterized in that the outside of the cylinder is provided with teeth, and the teeth are relatively large in size. When the mold in the prior art is used to make the gear, the mold will crack at the tooth position, and even if the material with better toughness is replaced or the hardness of the material is reduced, it cannot meet the requirements of continuous production, and the mold will still crack and be scrapped.

[0003] Moreover, in the prior art, the molds used for the gears are mostly one-piece mold structures. Once the mold is cracked, the entire mold will be damaged and need to be discarded, which is a particular waste of materials. Even if there is a split mold structure, when each module is specifically docked and installed, it may not be assembled properly, which also affects the manufacturing quality and efficiency of the mold.

[0004] Therefore, in order to solve the above problems, it is necessary to develop a lower die device with a reasonable structure for preventing cracking of flange gears. Summary of the invention

[0005] The purpose of the present invention is to provide a flange gear anti-cracking lower die and an anti-cracking use method thereof in view of the deficiencies in the prior art; the technical scheme is as follows:

[0006] A flange gear anti-cracking lower die and an anti-cracking use method thereof, comprising a lower die base, an anti-cracking outer jacket and an inner core, wherein the inner core is sleeved in the anti-cracking outer jacket by heat fitting and installed as a whole with the anti-cracking outer jacket, and the anti-cracking outer jacket is detachably installed on the lower die base, the mold cavity at the bottom of the inner core corresponds to the mold cavity position in the lower die base, and a mold cavity for making flange gears is also arranged inside the inner core.

[0007] Furthermore, the tooth body profile of the flange gear is processed correspondingly at the mold cavity inside the inner core; first, when the inner core and the anti-cracking outer sleeve are docked and installed, only the mold cavity is set inside the inner core, and after installation, the tooth body profile can be set accordingly, which is more reasonable.

[0008] Furthermore, the lower end of the anti-cracking sleeve is arranged as a conical portion, and the conical portion at the lower end is adapted to the size of the lower mold base; the design of the conical portion can facilitate subsequent docking and installation with the lower mold base, and screw holes can be arranged on both the lower mold base and the conical portion.

[0009] Furthermore, the lower die base is provided with screw holes, and the tapered portion at the lower end of the anti-cracking sleeve is also provided with screw holes at corresponding positions, and the anti-cracking sleeve is fixed to the lower die base by installing fastening bolts in the screw holes.

[0010] Furthermore, there are four screw holes on the lower mold base that are evenly spaced; the specific number of screw holes and the structural design are also very important, and the present invention is provided with four screw holes.

[0011] Furthermore, a core groove is provided inside the anti-cracking outer sleeve, the inner core is sleeved in the core groove, and an outward-expanding heat-matching groove is provided at the bottom of the core groove; and an annular heat-matching portion is provided at the bottom of the inner core, and the size of the heat-matching portion is adapted to the size of the heat-matching groove.

[0012] Furthermore, the heat-matching groove and the heat-matching part are both provided with a chamfered structure; the chamfered structure is mainly to make the heat-matching groove and the heat-matching part smoother and more reasonable during the specific docking installation.

[0013] The present invention also provides a method for manufacturing a crack-proof lower mold, comprising the following steps:

[0014] S1: Set the lower mold base, anti-cracking jacket and inner core with corresponding sizes respectively;

[0015] S2: First, the inner core and the anti-cracking jacket are installed correspondingly. The inner part of the anti-cracking jacket is provided with a core groove adapted to the size of the inner core, and the two are docked and installed by heat fitting, and then the assembly is completed with the lower mold base;

[0016] S3: Then, four screw holes are set on the lower mold base, and corresponding screw holes are also set on the tapered portion of the lower end of the corresponding anti-cracking jacket. The lower mold base and the anti-cracking jacket are installed as a whole by tightening the screws to manufacture a finished anti-cracking lower mold.

[0017] Furthermore, the heat fitting process is specifically as follows: firstly, the outer diameter of the heat fitting part at the lower end of the inner core is ground to the assembly size, and then the inner diameter of the heat fitting groove is cut out according to the outer diameter of the heat fitting part, and the inner diameter of the heat fitting groove is 0.05-0.06mm smaller than the outer diameter of the heat fitting part, and then the outer diameter of the heat fitting part is precision turned, and the inner diameter of the heat fitting groove is precision turned, and the clearance is matched to ensure the coaxiality;

[0018] Afterwards, the anti-cracking mold is placed in a heating furnace and heated to about 560°C, and then quickly taken out, and the heat-fitting part is quickly assembled into the heat-fitting groove to realize the assembly of the anti-cracking outer jacket and the inner core.

[0019] Beneficial effects: The present invention has the following beneficial effects:

[0020] 1) In the present invention, an anti-cracking jacket is arranged outside the inner core, and the anti-cracking jacket can provide a layer of tightening force when the inner core is expanded under pressure, thereby preventing the inner core from cracking. The structure is reasonably arranged, the quality and efficiency of mold forming are improved, and it is suitable for mass production;

[0021] 2) The present invention has a split structure. Even if the inner core is damaged and needs to be replaced, the lower mold base at the bottom can still be reused, which can effectively avoid material waste;

[0022] 3) In the present invention, the lower mold base and the anti-cracking jacket are installed correspondingly through screw holes and fastening bolts 701, which is convenient for disassembly;

[0023] 4) The inner core of the present invention is provided with a tooth profile, which can better produce the tooth structure on the flange gear, thereby improving the quality and efficiency of mold production;

[0024] 3) The present invention also provides a specific method for making an anti-cracking lower mold, wherein the inner core and the anti-cracking outer sleeve are installed correspondingly by heat fitting, which greatly improves the assembly accuracy and the finished product quality of the anti-cracking mold, and the structural design is very reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the present invention;

[0026] Figure 2 for Figure 1 Middle top view;

[0027] Figure 3 This is a structural diagram of the tooth body profile in the present invention;

[0028] Figure 4 for Figure 3 Top view;

[0029] Figure 5 This is an exploded view of the present invention;

[0030] Figure 6 This is a product diagram of a flange gear in the prior art;

[0031] Figure 7 This is a diagram of the installation structure of the anti-cracking sleeve and the fastening bolts in the present invention;

[0032] Figure 8 for Figure 7 Middle AA section view. DETAILED DESCRIPTION

[0033] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0034] like Figure 1 and Figure 2 As shown, a flange gear anti-cracking lower die and an anti-cracking use method thereof include a lower die base 1, an anti-cracking outer sleeve 2 and an inner core 3. The inner core 3 is mounted in the anti-cracking outer sleeve 2 by heat fitting and is installed as a whole with the anti-cracking outer sleeve 2. The anti-cracking outer sleeve 2 is detachably installed on the lower die base 1. The mold cavity 4 at the bottom of the inner core 3 corresponds to the position of the mold cavity 4 in the lower die base 1, and a mold cavity 4 for making a flange gear is also provided inside the inner core 3.

[0035] like Figure 3 , Figure 4 and Figure 5 As shown, the tooth body profile 5 of the flange gear is processed correspondingly at the mold cavity 4 inside the inner core 3; the tooth body profile 5 is processed into the mold cavity 4 inside the inner core 3 by mechanical processing, which is used for the specific production of the flange gear.

[0036] The lower end of the anti-cracking jacket 2 is provided with a tapered portion 6 , and the tapered portion 6 at the lower end is adapted to the size of the lower mold base 1 .

[0037] The lower mold base 1 is provided with screw holes 7 , and the conical portion 6 at the lower end of the anti-cracking jacket 2 is also provided with screw holes 7 at corresponding positions. The anti-cracking jacket 2 is fixed to the lower mold base 1 by installing fastening bolts 701 in the screw holes 7 .

[0038] There are four screw holes 7 on the lower mold base 1 at even intervals.

[0039] A core groove 8 is provided inside the anti-cracking outer sleeve 2, and the inner core 3 is inserted into the core groove 8, and an outward-expanding heat-matching groove 9 is provided at the bottom of the core groove 8; and an annular heat-matching portion 10 is provided at the bottom of the inner core 3, and the size of the heat-matching portion 10 is adapted to the size of the heat-matching groove 9; and a chamfered structure 11 is provided on both the heat-matching groove 9 and the heat-matching portion 10.

[0040] The present invention also provides a method for manufacturing an anti-cracking lower mold, comprising the following steps: firstly, a lower mold base, an anti-cracking outer sleeve and an inner core with corresponding sizes are respectively provided.

[0041] First, the inner core and the anti-cracking outer sleeve are installed correspondingly. The interior of the anti-cracking outer sleeve is provided with a core groove adapted to the size of the inner core, and the two are docked and installed by heat fitting, and then the assembly is completed with the lower mold base.

[0042] Then, four screw holes are set on the lower mold base, and corresponding screw holes are also set on the conical part of the lower end of the corresponding anti-cracking jacket. The lower mold base and the anti-cracking jacket are installed as a whole by tightening the screws to manufacture a finished anti-cracking lower mold.

[0043] The heat fitting process is specifically as follows: first, the outer diameter of the heat fitting part at the lower end of the inner core is ground to the assembly size, and then the inner diameter of the heat fitting groove is cut out according to the outer diameter of the heat fitting part. The inner diameter of the heat fitting groove is 0.05-0.06mm smaller than the outer diameter of the heat fitting part. Then, the outer diameter of the heat fitting part is precision turned, and the inner diameter of the heat fitting groove is precision turned, and the clearance is matched to ensure coaxiality.

[0044] Afterwards, the anti-cracking mold is placed in a heating furnace and heated to about 560°C, and then quickly taken out, and the heat-fitting part is quickly assembled into the heat-fitting groove to realize the assembly of the anti-cracking outer jacket and the inner core.

[0045] like Figure 7 and Figure 8 As shown, the outer wall of the anti-cracking sleeve 2 is provided with a circle of annular grooves 201, and an anti-cracking sleeve 202 of a matching size is installed in the annular groove 201. The anti-cracking sleeve 202 can rotate in the annular groove 201, and the lower end of the outer wall of the anti-cracking sleeve 202 is also provided with external teeth 203; and the threaded holes 7 on the lower mold base 1 are provided with four threaded holes 7 evenly spaced, and each threaded hole 7 is correspondingly installed with an adapted fastening bolt 701, and each fastening bolt 701 is provided with a threaded hole 702. An end gear 702 is correspondingly installed at the upper end of the fastening bolt 701, and the size of the end gear 702 is set accordingly. When the fastening bolt 701 is placed in the threaded hole, the end gear 702 at the upper end is meshed and installed with the outer teeth 203 at the lower end of the anti-cracking sleeve 202, and when the anti-cracking sleeve 202 rotates, the fastening bolt 701 can be driven to rotate through the cooperation between the outer teeth 203 and the end gear 702, thereby fixing the fastening bolt 701 in the threaded hole 7.

[0046] A rotating cross bar 204 is also installed at the upper end of the anti-cracking sleeve 202, which can drive the anti-cracking sleeve 202 to rotate accordingly, thereby driving the outer fastening bolt 701 to rotate; and for the purpose of adaptability, the upper end of the expansion portion 6 is set to a planar shape structure.

[0047] The specific working process of the present invention is as follows: the present invention specifically divides the entire lower mold into three parts, namely the lower mold base, the anti-cracking outer jacket and the inner core; first, the inner core and the anti-cracking outer jacket are installed correspondingly.

[0048] The interior of the anti-cracking jacket is provided with a core groove adapted to the size of the inner core, and the two are docked and installed by heat fitting. The heat fitting process is as follows: first, the outer diameter of the heat fitting part at the lower end of the inner core is ground to the required size, and then the inner diameter of the heat fitting groove is cut out according to the outer diameter of the heat fitting part. The inner diameter of the heat fitting groove is 0.05-0.06mm smaller than the outer diameter of the heat fitting part. Then, the outer diameter of the heat fitting part is precision turned, and the inner diameter of the heat fitting groove is precision turned, with clearance fit to ensure coaxiality; then, the anti-cracking mold is placed in a heating furnace, heated to about 560°C, and quickly taken out, and the heat fitting part is quickly assembled into the heat fitting groove to realize the assembly of the anti-cracking jacket and the inner core.

[0049] Then complete the assembly with the lower mold base. The lower mold base is provided with four screw holes, and the tapered portion at the lower end of the corresponding anti-cracking jacket is also provided with corresponding screw holes. Then, the lower mold base and the anti-cracking jacket can be installed as a whole by tightening the screws.

[0050] The technical solution of the present invention provides an anti-cracking outer coat on the outside of the inner core, so that when the inner core expands under pressure, it can be tightly wrapped by the anti-cracking outer coat, thereby preventing the inner core from cracking, and the structural setting is reasonable.

[0051] The present invention has a split structure, and even if the inner core is damaged and needs to be replaced, the lower mold base at the bottom can still be reused, which can effectively avoid material waste.

[0052] And if Figure 7 As shown in 8, in order to further increase the stability of the anti-cracking jacket, the device also installs an anti-cracking sleeve on the outside of the anti-cracking jacket by setting an annular groove corresponding to the anti-cracking sleeve. The anti-cracking sleeve is arranged on the outside of the anti-cracking jacket to further prevent cracking, and the anti-cracking sleeve not only has the anti-cracking function.

[0053] At the same time, a threaded hole is provided at the location of the outward expansion part, and the anti-cracking outer sleeve and the lower mold base can be installed as a whole by installing the fastening bolts through the threaded holes; and the device accordingly sets the upper end of the fastening bolt into the shape of an end gear; and the lower end of the outer wall of the anti-cracking sleeve is also provided with external teeth. In this way, when installing the fastening bolts, the size of the end gear is set accordingly, so that the end gear at the upper end of the fastening bolt can be meshed with the external teeth of the outer wall of the anti-cracking sleeve for installation. This design has two main characteristics.

[0054] First, the installation of the fastening bolts is very convenient. A rotating cross bar is provided on the upper end of the anti-cracking sleeve. The four end gears on the outer side can be driven to rotate by rotating the entire anti-cracking sleeve through the rotating cross bar, thereby driving the four fastening bolts to be locked in the threaded holes to achieve fixation. Moreover, it will be very convenient and quick to disassemble, and the four fastening bolts can be disassembled at the same time.

[0055] On the other hand, the four fastening bolts on the outside actually reinforce the anti-cracking sleeve from four sides, which can prevent the anti-cracking sleeve from cracking to a certain extent. After this design, the end gears on the upper ends of the four fastening bolts correspond to protecting the anti-cracking sleeve, and the anti-cracking sleeve corresponds to protecting the anti-cracking jacket, and the anti-cracking jacket corresponds to protecting the inner product. The overall structure is very reasonable.

[0056] The above specific implementation is only a preferred embodiment of the present invention and is not intended to limit the implementation of the present invention and the scope of the claims. All equivalent changes and modifications made according to the content of the patent protection scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A flange gear anti-cracking lower die, characterized in that: The invention comprises a lower die base (1), an anti-cracking outer sleeve (2) and an inner core (3); the inner core (3) is mounted in the anti-cracking outer sleeve (2) by means of heat fitting and is installed integrally with the anti-cracking outer sleeve (2); the anti-cracking outer sleeve (2) is installed on the lower die base (1); the mold cavity (4) at the bottom of the inner core (3) corresponds to the mold cavity (4) in the lower die base (1); and a mold cavity (4) for making a flange gear is also arranged inside the inner core (3).

2. A flange gear anti-cracking lower die according to claim 1, characterized in that: The tooth body profile (5) of the flange gear is processed correspondingly at the mold cavity (4) inside the inner core (3).

3. The flange gear anti-cracking lower die according to claim 1, characterized in that: The lower end of the anti-cracking outer sleeve (2) is arranged as a tapered portion (6), and the tapered portion (6) at the lower end is adapted to the size of the lower die base (1).

4. A flange gear anti-cracking lower die according to claim 2, characterized in that: The lower die base (1) is provided with a screw hole (7), and the conical portion (6) at the lower end of the anti-cracking sleeve (2) is also provided with a screw hole (7) at a corresponding position. By installing a fastening bolt (701) in the screw hole (7), the anti-cracking sleeve (2) is fixed to the lower die base (1).

5. The flange gear anti-cracking lower die according to claim 3, characterized in that: There are four screw holes (7) on the lower mold base (1) at even intervals.

6. The flange gear anti-cracking lower die according to claim 1, characterized in that: The anti-cracking outer sleeve (2) is provided with a core groove (8) inside, the inner core (3) is inserted into the core groove (8), and the bottom of the core groove (8) is provided with an outwardly expanded heat-matching groove (9); and the bottom of the inner core (3) is provided with an annular heat-matching portion (10), the size of which is adapted to the size of the heat-matching groove (9).

7. A flange gear anti-cracking lower die according to claim 6, characterized in that: The heat fitting groove (9) and the heat fitting portion (10) are both provided with a rounded structure (11).

8. A method for manufacturing the anti-cracking lower mold according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Set the lower mold base, anti-cracking jacket and inner core with corresponding sizes respectively; S2: First, the inner core and the anti-cracking jacket are installed correspondingly. The inner part of the anti-cracking jacket is provided with a core groove adapted to the size of the inner core, and the two are docked and installed by heat fitting, and then the assembly is completed with the lower mold base; S3: Then, four screw holes are set on the lower mold base, and corresponding screw holes are also set on the tapered portion of the lower end of the corresponding anti-cracking jacket. The lower mold base and the anti-cracking jacket are installed as a whole by tightening the screws to manufacture a finished anti-cracking lower mold.

9. The method for manufacturing a crack-proof lower mold according to claim 8, characterized in that: The heat fitting process is specifically as follows: firstly, the outer diameter of the heat fitting part at the lower end of the inner core is ground to the assembly size, and then the inner diameter of the heat fitting groove is cut out according to the outer diameter of the heat fitting part, and the inner diameter of the heat fitting groove is 0.05-0.06mm smaller than the outer diameter of the heat fitting part, and then the outer diameter of the heat fitting part is precision turned, and the inner diameter of the heat fitting groove is precision turned, and the clearance is matched to ensure the coaxiality; Afterwards, the anti-cracking mold is placed in a heating furnace and heated to about 560°C, and then quickly taken out, and the heat-fitting part is quickly assembled into the heat-fitting groove to realize the assembly of the anti-cracking outer jacket and the inner core.

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