Powder metallurgy die for spiral bevel gear of angle grinder

Abstract

The utility model discloses an angle grinder spiral bevel gear powder metallurgy die which comprises a second upper punch, a first upper punch, a middle die, a first lower punch, a second lower punch and a middle core rod, the second upper punch comprises a second upper punching cover and a second upper punching base, a second upper punch is arranged at the end of the second upper punching base, the first upper punch comprises a first upper punching cover and a first upper punching base, and a first upper punch is arranged at the end of the first upper punching base. The middle die comprises a middle die pressing cover and a middle die gasket, the middle die pressing cover is sleeved with a middle die pressing ring, the first lower punch comprises a first lower punching cover and a first lower punching base, a first lower punch is arranged at the end of the first lower punching cover, the second lower punch comprises a second lower punching cover and a second lower punching base, a second lower punch is arranged at the end of the second lower punching base, and the middle core rod comprises a middle core rod pressing cover and a middle core rod base. The utility model provides a powder metallurgy mold for a spiral bevel gear of an angle grinder. The powder metallurgy mold for the spiral bevel gear of the angle grinder can remarkably improve the filling uniformity, the demolding performance and the overall density consistency of a product.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy moulds, in particular to a powder metallurgy mould for a spiral bevel gear of an angle grinder. Background Art

[0002] Angle grinder, also known as grinding machine or disc grinder, is a kind of grinding tool used for cutting and grinding fiberglass. Angle grinder is a portable electric tool that uses fiberglass to cut and grind. It is mainly used for cutting, grinding and brushing metal and stone. Electric angle grinder uses high-speed rotating thin-blade grinding wheels, rubber grinding wheels, wire wheels, etc. to grind, cut, rust and polish metal components. Spiral bevel gears are the core components of angle grinders. In the existing technology, the method of machining is adopted, which has high processing difficulty and high material cost.

[0003] Using wheel powder metallurgy instead of traditional processing methods, there are some obvious structural defects in the design of the powder metallurgy mold for the spiral bevel gear of the angle grinder. Specifically, the mold usually places the teeth of the spiral bevel gear or the straight bevel gear at the bottom of the mold, and the tooth shape of the tooth is positioned on the fixed step of the middle mold belt. There are the following defects:

[0004] 1. Due to the existence of fixed steps, the mold's ability to adjust the powder height during the filling process is limited, making it difficult to maintain consistency in the density of the product. The uneven distribution of density may lead to unstable product performance, affecting its service life and reliability;

[0005] 2. The fixed step makes the demoulding process of the tooth part complicated, and it is easy to produce defects such as missing material or cracks in the tooth part during demoulding. This defect will reduce the load-bearing capacity and durability of the bevel gear, thereby affecting the performance of the entire transmission system;

[0006] 3. Since the barrel is located at the upper part of the mold, the powder needs to be transported from the bottom. This reverse transportation method increases the risk of uneven density of the barrel. The inconsistent density of the barrel may cause deformation or breakage of the product during use.

[0007] 4. Since the barrel is located at the upper part of the mold, that is, the barrel of the bevel gear is pressed and formed in the upper punch, the inner hole of the upper punch is subjected to great force. In the absence of the middle die support, the upper punch is very easy to break, which seriously affects the service life of the mold. Utility Model Content

[0008] The purpose of the utility model is to provide a powder metallurgy die for a spiral bevel gear of an angle grinder, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a powder metallurgy mold for a spiral bevel gear of an angle grinder, comprising an upper two punches, an upper punch, a middle die, a lower punch, a lower two punches, and a center core rod, the upper two punches comprising an upper two punch cover and an upper two punch seat, the end of the upper two punch seat is provided with an upper two punch, the upper punch comprises an upper punch cover and an upper punch seat, the end of the upper punch seat is provided with an upper punch, the middle die comprises a middle die pressure cover and a middle die gasket, a middle die pressure ring is sleeved on the middle die pressure cover, the lower punch comprises a lower punch cover and a lower punch seat, the end of the lower punch cover is provided with a next punch, the lower two punches comprise a lower two punch cover and a lower two punch seat, the end of the lower two punch seat is provided with a lower two punches, the center core rod comprises a center core rod pressure cover and a center core rod seat, the upper two punch seats are fixedly connected to the upper two punch covers by bolts, and the ends of the upper two punches pass through the upper two punch covers.

[0010] Preferably, the upper stamping cover and the upper punch seat are fixedly connected by bolts, and the end of the upper punch penetrates the upper stamping cover.

[0011] Preferably, a groove is formed on the top of the upper punch seat, and the upper second punch cover is located in the groove.

[0012] Preferably, the next punch cover and the next punch seat are fixedly connected by bolts, the ends of the upper two punches pass through the upper punch seat and the upper punch cover, and the ends of the upper two punches are inserted into the upper punch.

[0013] Preferably, the middle die gasket is in a stepped annular structure and is sleeved on the middle die pressing cover, and the end of the next punch penetrates the next pressing cover and the middle die.

[0014] Preferably, the lower second punch cover and the lower second punch seat are fixedly connected by bolts, the ends of the lower second punches pass through the lower second punch cover, the next punch seat and the middle die, and the ends of the lower second punches are inserted into the next punch.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model provides a powder metallurgy mold for spiral bevel gears of angle grinders. The improved mold structure allows the charging height to be adjusted more accurately, thereby ensuring that the density of the product at different parts is more uniform, effectively avoiding the problem of unstable product performance caused by uneven density. In addition, since the demoulding obstacle caused by the fixed step is eliminated, the shape and size of the tooth part can be better guaranteed, reducing the generation of defects such as lack of material and cracks, and improving the overall quality of the bevel gear; the structure of the middle mold cavity is optimized to ensure the density of the powder material in the barrel, further improving the production efficiency and product quality of the overall mold. The risk of mold breakage during the pressing process is avoided, and the service life of the mold is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of the powder metallurgy mold of the spiral bevel gear of the angle grinder of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the mold filling and charging of the utility model.

[0019] Figure 3 It is a schematic diagram of the structure of the mold pressing and forming of the utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the mold product of the utility model.

[0021] In the figure: upper two punch seats 1; upper two punch covers 2; upper punch 3; upper two punches 4; lower punch 5; middle die 6; middle die gasket 7; lower punch seat 8; lower two punch covers 9; center core rod 10; center core rod seat 11; center core rod pressure cover 12; lower two punch seats 13; lower two punches 14; lower punch cover 15; center die pressure ring 16; upper punch cover 17; upper punch seat 18. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figures 1 to 4 The utility model provides a technical solution: a powder metallurgy mold for a spiral bevel gear of an angle grinder, comprising an upper second punch, an upper first punch, a middle die 6, a lower punch, a lower second punch, and a middle core rod 10. The upper second punch comprises an upper second punch cover 2 and an upper second punch seat 1. The upper second punch seat 1 is fixedly connected to the upper second punch cover 2 by bolts. An upper second punch 4 is fixed to the end of the upper second punch seat 1, and the end of the upper second punch 4 passes through the upper second punch cover 2.

[0024] The upper punch includes an upper punch cover 17 and an upper punch seat 18, the upper punch cover 17 and the upper punch seat 18 are fixedly connected by bolts, the end of the upper punch seat 18 is fixed with an upper punch 3, the end of the upper punch 3 passes through the upper punch cover 17, a groove is formed on the top of the upper punch seat 18, the upper second punch cover 2 is located in the groove, the end of the upper second punch 4 passes through the upper punch seat 18 and the upper punch cover 17, and the end of the upper second punch 4 is inserted into the upper punch 3.

[0025] The middle die 6 includes a middle die pressure cover and a middle die gasket 7. The middle die gasket 7 is a stepped ring structure and is sleeved on the middle die pressure cover. The middle die pressure cover is sleeved with a middle die pressure ring 16. The next punch includes a next punch cover 15 and a next punch seat 8. The next punch cover 15 and the next punch seat 8 are fixedly connected by bolts. The end of the next punch cover 15 is fixed with the next punch 5, and the end of the next punch 5 passes through the next punch cover 15 and the middle die 6.

[0026] The middle die washer 7 can be made of a material with good thermal stability and anti-adhesion properties, such as high-speed steel or cemented carbide. In a high-temperature and high-pressure powder metallurgy environment, the middle die washer 7 can maintain good shape and dimensional stability, further improving the quality of the bevel gear product.

[0027] The lower second punch includes a lower second punch cover 9 and a lower second punch seat 13. The lower second punch cover 9 and the lower second punch seat 13 are fixedly connected by bolts. The end of the lower second punch seat 13 is fixed with a lower second punch 14. The end of the lower second punch 14 passes through the lower second punch cover 9, the next punch seat 8 and the middle die 6, and the end of the lower second punch 14 is inserted into the next punch 5.

[0028] The core rod 10 includes a core rod pressure cover 12 and a core rod seat 11. The core rod pressure cover 12 and the core rod seat 11 are fixedly connected by bolts. One end of the core rod 10 passes through the core rod pressure cover 12 and is fixed on the core rod seat 11, and the other end of the core rod 10 passes through the lower second punch seat 13, the lower second punch cover 9, the lower punch seat 8 and the lower second punch 14.

[0029] The upper second punch 4, the upper punch 3, the lower punch 5 and the lower second punch 14 are subjected to surface treatment, such as hard chrome plating or nitriding treatment, which improves the wear resistance and service life of the punches, and also helps to reduce the frequency of mold maintenance and replacement, thereby reducing long-term production costs.

[0030] The lifting heights of the next punch and the middle die 6 are different. The middle die 6 and the next punch are lifted up to form a middle die cavity with a volume space. The differentiated design of the lifting heights of the middle die 6 and the next punch can effectively control the gap between the dies during the powder metallurgy process, improve the forming accuracy of the bevel gear, and the formation of the middle die cavity is beneficial to the filling and pressure transmission of the powder, thereby improving the density uniformity and mechanical properties of the bevel gear.

[0031] In actual use, the middle mold 6 and the next punch are first lifted up. According to the different thickness of the middle part and the thickness of the edge teeth, the heights to which the middle mold 6 and the next punch are lifted are different. After the middle mold and the next punch are lifted up, a middle mold cavity with a volume space is formed. At this time, the powder feeding shoe feeds the powder raw materials in the powder feeding shoe into the middle mold cavity to complete the filling process.

[0032] In summary, the utility model provides a powder metallurgy mold for a spiral bevel gear of an angle grinder. The improved mold structure enables the charging height to be adjusted more accurately, thereby ensuring that the density of the product in different parts is more uniform, effectively avoiding the problem of unstable product performance caused by uneven density. In addition, since the demolding obstacles caused by the fixed steps are eliminated, the shape and size of the teeth can be better guaranteed, reducing the occurrence of defects such as material shortages and cracks, and improving the overall quality of the bevel gear; the structure of the middle mold cavity is optimized to ensure the density of the powder in the barrel, further improving the production efficiency and product quality of the overall mold.

[0033] After the loading is completed, the powder feeding shoe retreats, and the upper punch and the upper second punch press downward into the middle mold cavity. At the same time, the middle mold 6 and the next punch and the center core rod 10 move downward at different speeds and finally stop at the designed position. The upper punch and the upper second punch compact the powder in the middle mold cavity to achieve the required density and press it into the required size and shape.

[0034] After the pressing is completed and the pressing pressure is released, the middle mold 6 moves downward to allow the pressed product to move upward out of the middle mold cavity. Next, the upper first punch and the upper second punch return upward to leave the pressed product. At this time, the product is ejected from the mold.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy die for a spiral bevel gear of an angle grinder, comprising an upper second punch, an upper first punch, a middle die (6), a lower punch, a lower second punch, and a middle core rod (10), characterized in that: The upper second punch comprises an upper second punch cover (2) and an upper second punch seat (1), an upper second punch head (4) is arranged at the end of the upper second punch seat (1), the upper punch comprises an upper punch cover (17) and an upper punch seat (18), an upper punch head (3) is arranged at the end of the upper punch seat (18), the middle die (6) comprises a middle die pressing cover and a middle die gasket (7), a middle die pressing ring (16) is sleeved on the middle die pressing cover, the lower punch comprises a lower punch cover (15) and a lower punch seat (8), a lower punch head (5) is arranged at the end of the lower punch cover (15), the lower second punch comprises a lower second punch cover (9) and a lower second punch seat (13), a lower second punch head (14) is arranged at the end of the lower second punch seat (13), and the center core rod (10) comprises a center core rod pressing cover (12) and a center core rod seat (11); The upper second punch seat (1) and the upper second punch cover (2) are fixedly connected by bolts, and the end of the upper second punch (4) passes through the upper second punch cover (2).

2. The powder metallurgy mold for spiral bevel gear of angle grinder according to claim 1, characterized in that: The upper punch cover (17) and the upper punch seat (18) are fixedly connected by bolts, and the end of the upper punch (3) passes through the upper punch cover (17).

3. The powder metallurgy mold for spiral bevel gear of angle grinder according to claim 1, characterized in that: The top of the upper punch seat (18) forms a groove, and the upper second punch cover (2) is located in the groove.

4. The powder metallurgy mold for spiral bevel gear of angle grinder according to claim 1, characterized in that: The next punch cover (15) and the next punch seat (8) are fixedly connected by bolts, the end of the upper second punch (4) passes through the upper punch seat (18) and the upper punch cover (17), and the end of the upper second punch (4) is inserted into the upper punch (3).

5. The powder metallurgy mold for spiral bevel gear of angle grinder according to claim 1, characterized in that: The middle die gasket (7) is a stepped annular structure and is sleeved on the middle die pressing cover. The end of the next punch (5) penetrates the next pressing cover (15) and the middle die (6).

6. The powder metallurgy mold for spiral bevel gear of angle grinder according to claim 1, characterized in that: The lower second punch cover (9) and the lower second punch seat (13) are fixedly connected by bolts, the end of the lower second punch (14) passes through the lower second punch cover (9), the next punch seat (8) and the middle die (6), and the end of the lower second punch (14) is inserted into the next punch (5).

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