Anti-cracking lower die device for flange gear

Abstract

The utility model discloses an anti-cracking lower die device for a flange gear, which comprises a lower die base, an anti-cracking outer sleeve and an inner core, the inner core is sleeved in 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 anti-cracking 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 provided through the anti-cracking outer sleeve when the inner core is expanded due to pressure, so that the inner core is prevented from cracking, the structural arrangement is reasonable, the mold forming quality and efficiency are improved, and the device is suitable for mass production.

Description

Technical Field

[0001] The utility model relates to the technical field of gear manufacturing molds, and specifically relates to an anti-cracking lower mold device for flange gears. Background Art

[0002] As Figure 6 shown, it is the structural form of an existing flange gear. The characteristic of the flange gear is that tooth parts are arranged on the outer part of the cylinder body, and the size of the tooth parts is relatively large. When the existing mold is specifically used to manufacture this gear, the mold will crack at the tooth part position. Moreover, even if materials with better toughness are replaced and the material hardness is reduced, the requirements for continuous production cannot be met, and the mold still has the situation of cracking and being scrapped.

[0003] Moreover, in the prior art, the molds for this gear are mostly of an integral mold structure. After the mold cracks, the whole mold will be damaged and needs to be abandoned, which is particularly wasteful of materials. And even if there is a split mold structure, when the specific modules are docked and installed, there will also be a situation where the assembly is not in place, 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 an anti-cracking lower mold device for flange gears with a reasonable structure. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an anti-cracking lower mold device for flange gears aiming at the deficiencies existing in the prior art; its technical solution is as follows:

[0006] An anti-cracking lower mold device for flange gears includes a lower mold base, an anti-cracking outer sleeve, and an inner core. The inner core is sleeved inside the anti-cracking outer sleeve by means of hot fitting and is installed integrally with the anti-cracking outer sleeve. The anti-cracking outer sleeve is detachably installed on the lower mold base. The mold cavity at the bottom of the inner core corresponds to the mold cavity position in the lower mold base, and a mold cavity for manufacturing flange gears is also arranged inside the inner core.

[0007] Furthermore, a tooth body contour of the flange gear is correspondingly machined at the mold cavity inside the inner core; firstly, when the inner core and the anti-cracking outer sleeve are docked and installed, only the mold cavity needs to be arranged inside the inner core, and after the installation, the tooth body contour can be correspondingly arranged, which is more reasonable.

[0008] Furthermore, the lower end of the anti-cracking outer sleeve is set as a tapered part, and the tapered part at the lower end is adapted to the size of the lower mold base; the design of the tapered part 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 tapered part.

[0009] Furthermore, screw holes are provided on the lower die base, and corresponding screw holes are also provided on the conical part at the lower end of the anti-cracking outer sleeve. The anti-cracking outer sleeve is fixed on the lower die base by installing fastening screws in the screw holes.

[0010] Furthermore, a total of four screw holes with uniform intervals are provided on the lower die base; the specific number and structural design of the screw holes are also very important, and four are provided in this device.

[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-expanded hot-fitting groove is provided at the bottom of the core groove; and an annular hot-fitting part is provided at the bottom of the inner core, and the size of the hot-fitting part is adapted to the size of the hot-fitting groove.

[0012] Furthermore, rounding structures are provided on both the hot-fitting groove and the hot-fitting part; the rounding structures are mainly to make the docking and installation of the hot-fitting groove and the hot-fitting part smoother and more reasonable.

[0013] Beneficial effects: The utility model has the following beneficial effects:

[0014] 1) An anti-cracking outer sleeve is provided outside the inner core in this device. When the inner core expands under pressure, the anti-cracking outer sleeve can give it a layer of tightening force, thereby avoiding cracking of the inner core. The structure is reasonably arranged, improving the forming quality and efficiency of the mold, and suitable for mass production;

[0015] 2) This device is of a split structure. Even if the inner core inside is damaged and needs to be replaced, the lower die base at the bottom can still be reused, effectively avoiding material waste;

[0016] 3) The inner core and the anti-cracking outer sleeve in this device are correspondingly installed in a hot-fitting manner, which can correspondingly improve the assembly accuracy, and the structure is very reasonably arranged;

[0017] 4) The lower die base and the anti-cracking outer sleeve in this device are specifically installed correspondingly through screw holes and fastening screws, and the disassembly is convenient;

[0018] 5) A tooth profile is provided inside the inner core in this device, which can preferably make the tooth structure on the flange gear, improving the quality and efficiency of mold making. Description of the drawings

[0019] Figure 1 is the structural diagram of the utility model;

[0020] Figure 2 is Figure 1 the top view in;

[0021] Figure 3 is the structural diagram of the tooth body profile in the utility model;

[0022] Figure 4 For Figure 3 Top view;

[0023] Figure 5 This is the exploded view of the utility model;

[0024] Figure 6 This is the product drawing of the flange gear of the prior art. Specific embodiments

[0025] The following further clarifies the utility model in conjunction with the accompanying drawings and specific embodiments. These embodiments are implemented on the premise of the technical solution of the utility model. It should be understood that these embodiments are only used to illustrate the utility model and not to limit the scope of the utility model.

[0026] As Figure 1 and Figure 2 shown, a lower die device for preventing cracking of a flange gear includes a lower die base 1, an anti-cracking outer sleeve 2, and an inner core 3. The inner core 3 is sleeved inside the anti-cracking outer sleeve 2 by hot fitting and is installed integrally 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 manufacturing the flange gear is also provided inside the inner core 3.

[0027] As Figure 3 , Figure 4 and Figure 5 shown, a tooth body contour 5 of the flange gear is correspondingly machined at the mold cavity 4 inside the inner core 3; the mold cavity 4 inside the inner core 3 is machined into a tooth body contour 5 by mechanical processing for specifically manufacturing the flange gear.

[0028] The lower end of the anti-cracking outer sleeve 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 die base 1.

[0029] The lower die base 1 is provided with screw holes 7, and the tapered portion 6 at the lower end of the anti-cracking outer sleeve 2 is also provided with screw holes 7 corresponding in position. The anti-cracking outer sleeve 2 is fixed on the lower die base 1 by installing fastening screws in the screw holes 7.

[0030] There are four screw holes 7 on the lower die base 1 that are evenly spaced.

[0031] A core groove 8 is provided inside the anti-cracking outer sleeve 2. The inner core 3 is sleeved inside the core groove 8, and an outwardly expanding hot-fitting groove 9 is provided at the bottom of the core groove 8; a ring-shaped hot-fitting portion 10 is provided at the bottom of the inner core 3, and the size of the hot-fitting portion 10 is adapted to the size of the hot-fitting groove 9.

[0032] Both the hot-fitting groove 9 and the hot-fitting portion 10 are provided with a fillet structure 11.

[0033] The specific working process of this device is as follows: This device specifically divides the entire lower mold into three parts, namely the lower mold base, the anti-cracking outer sleeve, and the inner core. First, the inner core and the anti-cracking outer sleeve are installed correspondingly.

[0034] The inner part of the anti-cracking outer sleeve is provided with a core groove adapted to the size of the inner core, and the two are specifically docked and installed through a hot-fitting method. The specific hot-fitting process is as follows: First, grind the outer diameter of the hot-fitting part at the lower end of the inner core to the required size, then cut out the inner diameter of the hot-fitting groove according to the outer diameter of the hot-fitting part. The inner diameter of the hot-fitting groove is 0.05 - 0.06 mm smaller than the outer diameter of the hot-fitting part. Then, finely machine the outer diameter of the hot-fitting part and the inner diameter of the hot-fitting groove, and perform clearance fit to ensure coaxiality. Then, put the anti-cracking mold into a heating furnace and heat it to about 560 °C, quickly take it out, and quickly assemble the hot-fitting part into the hot-fitting groove to achieve the assembly of the anti-cracking outer sleeve and the inner core.

[0035] After that, complete the device with the lower mold base. There are four screw holes on the lower mold base, and correspondingly, there are also screw holes at the corresponding positions on the conical part at the lower end of the anti-cracking outer sleeve. Then, the lower mold base and the anti-cracking outer sleeve can be installed as a whole by tightening the screws.

[0036] Since a layer of anti-cracking outer sleeve is provided outside the inner core in the technical solution of this device, when the inner core expands under pressure, it can be tightly wrapped by the anti-cracking outer sleeve, thus avoiding cracking of the inner core, and the structural setting is reasonable.

[0037] This device is of a split structure. Even if the inner core inside is damaged and needs to be replaced, the lower mold base at the bottom can still be reused, effectively avoiding material waste.

[0038] The above specific implementation manner is only a preferred embodiment of the present invention, and is not used to limit the implementation and the scope of the claims of the present invention. Any equivalent changes and modifications made based on the content of the patent protection scope of the present invention shall be included within the scope of the patent application of the present invention.

Claims

1. An anti-cracking lower die device for a flange gear, characterized in that: It includes a lower die base (1), an anti-cracking outer sleeve (2) and an inner core (3). The inner core (3) is sleeved inside the anti-cracking outer sleeve (2) by a hot-fitting method and 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 position of the mold cavity (4) in the lower die base (1), and a mold cavity (4) for manufacturing a flange gear is also provided inside the inner core (3).

2. The anti-cracking lower die device for a flange gear according to claim 1, wherein: A tooth profile (5) of the flange gear is machined correspondingly at the mold cavity (4) inside the inner core (3).

3. The anti-cracking lower die device for a flange gear according to claim 1, characterized in that: The lower end of the anti-cracking outer sleeve (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 die base (1).

4. The anti-cracking lower die device for a flange gear according to claim 2, characterized in that: Screw holes (7) are provided on the lower die base (1), and screw holes (7) corresponding in position are also provided on the tapered portion (6) at the lower end of the anti-cracking outer sleeve (2). The anti-cracking outer sleeve (2) is fixed on the lower die base (1) by installing fastening screws in the screw holes (7).

5. The anti-cracking lower die device for a flange gear according to claim 3, characterized in that: A total of four screw holes (7) evenly spaced are provided on the lower die base (1).

6. The anti-cracking lower die device for a flange gear according to claim 1, characterized in that: A core groove (8) is provided inside the anti-cracking outer sleeve (2). The inner core (3) is sleeved inside the core groove (8), and an outward-expanded hot-fitting groove (9) is provided at the bottom of the core groove (8). An annular hot-fitting portion (10) is provided at the bottom of the inner core (3), and the size of the hot-fitting portion (10) is adapted to the size of the hot-fitting groove (9).

7. The anti-cracking lower die device for a flange gear according to claim 6, wherein: Round-off structures (11) are provided on both the hot-fitting groove (9) and the hot-fitting portion (10).

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