Upper punching die exhaust device for powder metallurgy compression molding

Abstract

The utility model relates to an upper punching die exhaust device for powder metallurgy compression molding. Comprising a base plate, a gland and a die punch, the die punch is pressed on the base plate through the gland, the die punch is provided with a plurality of core rod holes, two sets of exhaust holes and interconnection holes, the core rod holes are divided into two sets, the core rod holes in each set are communicated with the same exhaust hole, the exhaust holes extend to the outer side face of the die punch, and the two sets of exhaust holes are communicated through the interconnection holes; the joints of the exhaust holes and the core rod holes are of Y-shaped structures, the interconnection holes are connected to the middle intersections of the Y-shaped structures, and the longitudinal sections of the interconnection holes are of inverted-V-shaped structures. The core rod hole is communicated with the exhaust hole, the exhaust hole extends to the outer side face of the die punch and is connected with the pneumatic electromagnetic valve, air is introduced into the exhaust hole of the die punch when the upper punch is in the return stroke state, and powder remaining in the core rod hole is ventilated and cleaned.

Description

Technical Field

[0001] The utility model belongs to the field of powder metallurgy pressing and forming equipment, and in particular relates to an upper punch die exhaust device for powder metallurgy pressing and forming. Background Art

[0002] At present, the two types of presses commonly used for powder compacting are mechanical presses and hydraulic presses, both of which require a complete set of molds, including an upper punch part, a cavity part, a lower punch part (a lower floating punch part and a lower fixed punch part), and a core rod part; the metal powder mixture is loaded into a steel cavity, the cavity determines the appearance of the product, and the core rod in the cavity determines the aperture of the product. The powder is pressurized and formed by the upper and lower punches, and the compact is removed from the cavity after the pressure is released to complete the forming process. During this process, some residual powder will continue to accumulate at the upper punch position corresponding to the core rod, and the accumulation of powder in the upper punch die hole will cause it to be blocked, and when the upper punch continues to press down, the core rod will break. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an exhaust device for an upper punch die of powder metallurgy pressing molding, in which an exhaust hole is connected to the core rod hole, and the exhaust hole extends to the outer side surface of the die punch and is connected to a pneumatic solenoid valve. When the upper punch is in a return state, air is introduced into the exhaust hole of the die punch to ventilate and clean the powder remaining in the core rod hole.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A venting device for an upper punch die for powder metallurgy pressing, comprising a backing plate, a pressure cover and a die punch, wherein the pressure cover presses the die punch onto the backing plate, the die punch is provided with a plurality of core rod holes, two groups of venting holes and interconnecting holes, the plurality of core rod holes are divided into two groups, the plurality of core rod holes on each group are respectively connected to the same venting hole, the venting holes extend all the way to the outer side surface of the die punch, and the two groups of venting holes are connected via the interconnecting holes; the connection between the venting holes and the plurality of core rod holes is in a Y-shaped structure, the interconnecting holes are connected at the middle intersection of the Y-shaped structure, the longitudinal section of the interconnecting holes is in an inverted V-shaped structure, and an air pressure sensor is provided at the top of the interconnecting holes.

[0006] The upper punch die exhaust device of the powder metallurgy pressing molding adopts this structure, and a plurality of core rod holes are provided at the lower end of the punch of the die, and the core rod holes are matched with the core rod of the lower punch part, and the plurality of core rod holes are divided into two symmetrical groups, and the plurality of core rod holes on each group are respectively connected with the same exhaust hole on the side, so that the connection structure of the exhaust hole and the plurality of core rod holes is a Y-shaped structure, and because the exhaust hole is connected with the pneumatic solenoid valve, when the pneumatic solenoid valve is started, air can be introduced into the exhaust hole, and the air will be diverted at the Y-shaped structure, and the diverted air will enter different core rod holes, The powder remaining in it is blown away. Since the gas flow rate of each branch will be reduced after the air is diverted, it can be fully competent when there is not much powder remaining in the core rod hole. However, due to many uncertain factors in the production process, the residual powder may not be cleaned well every time. If too much powder accumulates in the core rod hole during the operation of the machine, it will cause the possibility of core rod breakage again. However, simply increasing the gas flow rate of the pneumatic solenoid valve will only increase the cost of each stamping. Therefore, it is best to control the gas flow rate of the pneumatic solenoid valve to only be able to blow away a small amount of residual powder in the core rod hole. In order to avoid the situation where a large amount of powder accumulates in the core rod hole without knowing it during long-term operation, an interconnecting hole that connects to each other is set between the two groups of exhaust holes, and the interconnecting hole is set to an inverted V-shaped structure, and an air pressure sensor is set at the top thereof. When a certain amount of powder accumulates in the core rod hole on one side, it causes blockage. The upwardly inclined interconnecting hole can prevent the accumulated powder at the lower end from blocking the interconnecting hole at the upper end, and the pneumatic solenoid valve on this side completes the normal operation of the process. When air is admitted, the air cannot be blown out from the core rod hole on that side, so it can only pass into the interconnecting hole and blow out from the core rod hole on the other side. Because the core rod holes on both sides can pass gas under normal use, the air pressure that can be detected by the air pressure sensor in the interconnecting hole will be very low. When only one side can pass air, since the air pressure of the pneumatic solenoid valves on both sides is fixed, the blockage on one side will cause a sudden increase in the internal air pressure. The air pressure abnormality can be detected by the air pressure sensor, and the operator can be notified to clean and repair the core rod hole at that location.

[0007] Furthermore, the axial intersection angle between the interconnecting hole and the exhaust hole does not exceed 170°.

[0008] Furthermore, a quick connector is provided at the connection between the exhaust hole and the outer side surface of the die punch.

[0009] Compared with the prior art, the utility model has the advantages that: through the exhaust hole connected to the core rod hole, the pneumatic solenoid valve is connected to allow air to pass, and the fluidity of the air is used to blow out the residual powder in the core rod hole, so as to avoid the accumulation of powder in the core rod hole. When the upper punch mold works for a long time, the core rod hole will inevitably be blocked by the accumulation of powder again. Therefore, an interconnecting hole is set between the two groups of exhaust holes, and an air pressure sensor is provided in the interconnecting hole. When the air pressure in the interconnecting hole is abnormal, it means that the core rod hole on one side is blocked and the air flow is blocked. The operator can be notified in time to clean and repair the core rod hole at that location, so as to avoid the possibility of the core rod breaking again due to excessive accumulation of powder in the core rod hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a three-dimensional diagram of the utility model;

[0012] Figure 2 It is a front view of the utility model;

[0013] Figure 3 It is a bottom view of the utility model;

[0014] Figure 4 For the utility model Figure 3 AA section view;

[0015] Figure 5 It is a left view of the utility model;

[0016] Figure 6 For the utility model Figure 5 BB cross-sectional view.

[0017] Among them: 1. pad; 2. gland; 3. die punch; 31. core rod hole; 32. exhaust hole; 33. interconnection hole; 34. air pressure sensor; 35. quick connector. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0019] The specific implementation of the utility model will be described below in conjunction with the accompanying drawings:

[0020] like Figure 1-6 As shown, an exhaust device for an upper punch die of powder metallurgy pressing molding comprises a backing plate 1, a pressure cover 2 and a die punch 3, wherein the pressure cover 2 presses the die punch 3 onto the backing plate 1, and the die punch 3 is provided with a plurality of core rod holes 31, two groups of exhaust holes 32 and an interconnecting hole 33, wherein the plurality of core rod holes 31 are divided into two groups, and the plurality of core rod holes 31 on each group are respectively connected to the same exhaust hole 32, wherein the exhaust holes 32 extend all the way to the outer side surface of the die punch 3, and the two groups of exhaust holes 32 are connected via the interconnecting hole 33; the connection between the exhaust hole 32 and the plurality of core rod holes 31 is in a Y-shaped structure, the interconnecting hole 33 is connected at the middle intersection of the Y-shaped structure, the longitudinal section of the interconnecting hole 33 is in an inverted V-shaped structure, and an air pressure sensor 34 is provided at the top of the interconnecting hole 33.

[0021] Furthermore, the axial intersection angle between the interconnecting hole 33 and the exhaust hole 32 does not exceed 170°.

[0022] Furthermore, a quick connector 35 is provided at the connection between the exhaust hole 32 and the outer side surface of the die punch 3 .

[0023] Description of the working method of this utility model:

[0024] The exhaust device of the upper punch die of powder metallurgy pressing molding adopts this structure, and a plurality of core rod holes 31 are provided at the lower end of the punch of the die, and the core rod holes 31 cooperate with the core rod of the lower punch part, and the plurality of core rod holes 31 are divided into two symmetrical groups, and the plurality of core rod holes 31 on each group are respectively connected with the same exhaust hole 32 on the side, so that the connection structure between the exhaust hole 32 and the plurality of core rod holes 31 is a Y-shaped structure, and because the exhaust hole 32 is connected with the pneumatic solenoid valve through its external quick connector 35, when the pneumatic solenoid valve is started, air can be introduced into the exhaust hole 32, and the air will be diverted at the Y-shaped structure, and the diverted air will enter different core rod holes 31 to blow away the powder remaining therein, and because After the air is diverted, the gas flow rate of each branch will be reduced. When there is not much residual powder in the core rod hole 31, it can fully meet the requirements. However, due to many uncertain factors in the production process, the residual powder may not be cleaned well every time. If too much powder accumulates in the core rod hole 31 during the operation of the machine, it may cause the core rod to break again. However, simply increasing the gas flow rate of the pneumatic solenoid valve will only increase the cost of each stamping. Therefore, it is best to control the gas flow rate of the pneumatic solenoid valve to only be able to blow away a small amount of residual powder in the core rod hole 31. In order to avoid the situation where a large amount of powder accumulates in the core rod hole 31 without knowing it during long-term operation. In order to prevent the occurrence of such a situation, an interconnecting hole 33 is provided between the two groups of exhaust holes 32 to connect with each other, and the interconnecting hole 33 is provided in an inverted V-shaped structure, and an air pressure sensor 34 is provided at the top thereof. When a certain amount of powder is accumulated in the core rod hole 31 on one side and causes blockage, the interconnecting hole 33 inclined upward can prevent the accumulated powder at the lower end from blocking the interconnecting hole 33 at the upper end, especially when the axial intersection of the interconnecting hole 33 and the exhaust hole 32 is at an angle not exceeding 170°, the upward inclination will make it more difficult for the powder to accumulate. However, once the inclination exceeds 170°, the powder will easily accumulate at the bottom, and the blockage of powder in the interconnecting hole 33 will increase the difficulty of cleaning. Therefore, the angle It is most suitable when it does not exceed 170°; and when the pneumatic solenoid valve on that side normally introduces air after completing the process, the air cannot be blown out from the core rod hole 31 on that side, so it can only pass into the interconnecting hole 33 and blow out from the core rod hole 31 on the other side. Because the core rod holes 31 on both sides can pass gas under normal use, the air pressure that can be detected by the air pressure sensor 34 in the interconnecting hole 33 will be very low. When only one side can pass air, since the air pressure of the pneumatic solenoid valves on both sides is fixed, the blockage on one side will cause a sudden increase in the internal air pressure. The air pressure abnormality can be detected by the air pressure sensor 34, and the operator can be notified to clean and repair the core rod hole 31 at that location.

[0025] The beneficial effect of the utility model is that air is introduced through the exhaust hole 32 connected to the core rod hole 31, and the pneumatic solenoid valve is connected to the air, and the residual powder in the core rod hole 31 is blown out by the fluidity of the air, so as to avoid the accumulation of powder in the core rod hole 31. When the upper punch mold works for a long time, the core rod hole 31 will inevitably be blocked by the accumulation of powder again. Therefore, an interconnection hole 33 is set between the two groups of exhaust holes 32, and an air pressure sensor 34 is provided in the interconnection hole 33. When the air pressure in the interconnection hole 33 is abnormal, it means that the core rod hole 31 on one side is blocked and the air flow is blocked. The operator can be notified in time to clean and repair the core rod hole 31 at that location, so as to avoid the possibility of the core rod breaking again due to excessive accumulation of powder in the core rod hole 31.

[0026] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An exhaust device for an upper punch die of powder metallurgy pressing, comprising a backing plate, a pressure cover and a die punch, wherein the pressure cover presses the die punch onto the backing plate, and a plurality of core rod holes are provided at the lower end of the die punch, characterized in that: The die punch is also provided with two groups of exhaust holes and interconnecting holes, and the plurality of core rod holes are divided into two groups. The plurality of core rod holes in each group are respectively connected to the same exhaust hole, and the exhaust holes extend all the way to the outer side surface of the die punch. The two groups of exhaust holes are connected through the interconnecting holes.

2. The upper punch die exhaust device for powder metallurgy pressing according to claim 1 is characterized in that: The connection between the exhaust hole and the plurality of core rod holes is in a Y-shaped structure, and the interconnection hole is connected at the middle intersection of the Y-shaped structure.

3. The upper punch die exhaust device for powder metallurgy pressing according to claim 2, characterized in that: The longitudinal section of the interconnecting holes is an inverted V-shaped structure, and an air pressure sensor is arranged at the top of the interconnecting holes.

4. The upper punch die exhaust device for powder metallurgy pressing according to claim 3 is characterized in that: The axial intersection angle between the interconnecting hole and the exhaust hole does not exceed 170°.

5. The upper punch die exhaust device for powder metallurgy pressing according to claim 1, characterized in that: A quick connector is provided at the connection between the exhaust hole and the outer side surface of the die punch.

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