Powder metallurgy spring bolt machining die

Abstract

The utility model discloses a powder metallurgy spring bolt machining die which comprises an upper punch, a middle die and a first lower punch which are sequentially arranged in the die assembly direction, a cavity is formed in the middle die, and the cavity comprises two guide-in parts which are used for the upper punch and the first lower punch to stretch into the cavity from the top and the bottom of the middle die respectively. The forming part is communicated with the two leading-in parts, and an arc groove connected with the two leading-in parts is formed in one end of the forming part; a powder running groove is formed in the top of the middle mold; the powder running groove is communicated with a guide-in part positioned at the top end of the forming part and is connected with the arc groove; the die can be prevented from being abraded or broken due to too high product density caused by too much powder during forming.

Description

Technical Field

[0001] This utility model relates to powder metallurgy processing molds, and in particular to a powder metallurgy locking tongue processing mold. Background Technology

[0002] In the prior art, the latch includes a latch body, a connecting groove at the tail end for connecting to the latching mechanism, a locking hole between the connecting groove and the tip, and an arc surface at the tip for guiding the tip into the lock hole during latching. When machining this type of latch, powder metallurgy molding is generally used for pressing, resulting in high production efficiency and material savings. The powder metallurgy molding die includes an upper punch, a middle die, a lower punch, a lower second punch, and a forming mandrel arranged sequentially along the mold closing direction. The middle die has a cavity with openings on its top and bottom surfaces, and chamfers at these openings to facilitate the upper and lower punches entering the cavity during mold closing. To form the arc surface at the tip of the latch body, an arc-shaped forming tip is provided at the pressing end of the upper punch (see Appendix). Figure 1 and Figure 2 The arc-shaped forming tip is suspended, thin, lacks support, and has low strength. When the mold is closed, due to excessive powder filling and high product density, the arc-shaped forming tip is subjected to too much pressure and is prone to rapid wear or even chipping. It is difficult to ensure the continuous processing of the tongue tip arc surface forming of the main body of the lock tongue, which increases the maintenance cost of the mold and affects the production progress. Utility Model Content

[0003] The purpose of this invention is to provide a powder metallurgy lock tongue processing mold that can avoid excessive powder loading, effectively reduce wear, and ensure the continuous processing of the tongue tip arc surface of the lock tongue body, thereby reducing the mold maintenance cost.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A powder metallurgy locking tongue processing mold includes an upper punch, a middle die, and a lower punch arranged sequentially along the mold closing direction. The middle die forms a cavity, which includes two inlet portions for the upper punch and the lower punch to extend into the cavity from the top and bottom of the middle die, respectively, and a forming portion connecting the two inlet portions. One end of the forming portion forms an arc groove connecting the two inlet portions. The middle die has a powder discharge groove at its top, which connects to the inlet portion located at the top of the forming portion and is connected to the arc groove.

[0006] Based on the above technical solution, the present invention can be improved as follows:

[0007] Furthermore, the ends of the two guide portions and the forming portion that are away from the arc groove are flush with each other. The length of the guide portion located at the top of the forming portion corresponds to the length of the top surface of the latch body, and the length of the guide portion located at the bottom of the forming portion corresponds to the length of the bottom surface of the latch body.

[0008] Furthermore, the curvature of the arc groove corresponds to the curvature of the arc surface at the tip of the latch body.

[0009] Furthermore, the width of the powder running trough is greater than the width of the inlet portion located at the top of the forming part.

[0010] Furthermore, the next punch is interspersed with a second punch, which is used to pass through the next punch during mold closing and extend into the cavity to cooperate with the upper punch to form the connecting groove on the locking tongue body.

[0011] Furthermore, the lower two punches are provided with a forming mandrel, which is used to pass through the lower two punches and the next punch in sequence during mold closing and then extend into the cavity to form the locking hole on the locking tongue body.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This invention forms a cavity inside the middle mold. The cavity includes two inlet sections and a forming section that connects the two inlet sections. An arc groove is provided at one end of the forming section. The tip of the latch body is formed through the arc groove. A powder discharge groove is provided at the top of the middle mold. The powder discharge groove connects to the inlet section located at the top of the forming section and is connected to the arc groove. The powder discharge groove can prevent excessive powder from being added during forming, which would lead to excessive product density and wear or chipping of the mold. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of an upward-pressing structure in the prior art;

[0016] Figure 2 This is a top view of the latch;

[0017] Figure 3 This is a side cross-sectional view of the latch;

[0018] Figure 4 This is a schematic diagram of the powder metallurgy locking tongue processing mold of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the mold in this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the next stroke of this utility model;

[0021] Figure 7 This is a schematic diagram of the lower two-stroke structure of this utility model.

[0022] The markings on the attached diagram are as follows: 1-Lock tongue body, 101-Connecting groove, 102-Card hole, 103-Arc surface, 2-Upper punch, 201-First mandrel insertion hole, 202-Slot, 3-Middle mold, 301 Mold sleeve, 302-Mold core, 302a-First inlet part, 302b-Second inlet part, 302c-Forming part, 303-Arc groove, 304-Powder discharge groove, 4-Lower punch, 401-Second mandrel insertion hole, 402-Through groove, 5-Lower second punch, 501-Third mandrel insertion hole, 6-Forming mandrel. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These descriptions are intended to aid in understanding the utility model but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] See Figures 2 to 7 This utility model relates to a powder metallurgy lock tongue processing mold. The lock tongue processed by the mold includes a lock tongue body 1. One end of the length of the lock tongue body 1 is the tail end of the tongue, and the other end of the length of the lock tongue body 1 is the tip end of the tongue. The lock tongue body 1 is provided with a connecting groove 101 for connecting the buckle action mechanism at the tail end of the tongue. The lock tongue body 1 is provided with a locking hole 102 between the connecting groove 101 and the tip end of the tongue. The lock tongue body 1 is provided with an arc surface 103 at the tip end of the tongue for guiding the tip end of the tongue into the lock hole when buckling.

[0025] The processing mold includes an upper punch 2, a middle die 3, a lower punch 4, a lower second punch 5, and a forming mandrel 6 arranged sequentially along the mold closing direction; the upper punch 2 is set on the upper ejection mechanism of the press; the middle die 3 is fixedly set on the worktable of the press, and a cavity for forming the locking tongue body 1 is formed inside the middle die 3; the lower punch 4, the lower second punch 5, and the forming mandrel 6 are set on the lower ejection mechanism of the press mechanism and are inserted sequentially from the outside to the inside.

[0026] When the mold is closed, the upper punch 2 and the lower punch 4 can extend into the cavity of the middle mold 3 along the axis of the middle mold 3 to form the locking tongue body 1. The lower second punch 5 passes through the lower punch 4 and extends into the cavity of the middle mold 3 to cooperate with the upper punch 2 to form the connecting groove 101 on the locking tongue body 1. The forming core rod 6 passes through the lower second punch 5 and the lower punch 4 in sequence and extends into the cavity of the middle mold 3 to cooperate with the upper punch 2 to form the locking hole.

[0027] Specifically, the middle mold 3 includes a mold sleeve 301 that can be fixed on the press worktable with the middle mold 3 cover, and a mold core 302 disposed inside the mold sleeve 301; the mold sleeve 301 has a mating cavity in the middle that mates with the mold core 302, and the mold core 302 is interference-fitted into the mating cavity of the mold sleeve 301, and the end faces of the mold core 302 and the mold sleeve 301 are flush after mating; the bottom of the mold sleeve 301 has an insertion port that communicates with the mating cavity, through which the next punch 4 can be inserted into the mold core 302 from the bottom of the mold sleeve 301.

[0028] The mold core 302 has a cylindrical structure, and a cavity for forming the latch body 1 is formed inside the mold core 302. The cavity has a stepped structure, including a first inlet 302a, a forming part 302c, and a second inlet 302b connected sequentially from the top to the bottom of the mold core 302. The first inlet 302a is connected to the top surface of the mold core 302 so that the upper punch 2 can enter the cavity from the top surface of the mold core 302. The second inlet 302b is connected to the bottom surface of the mold core 302 so that the lower punch 4 can enter the cavity from the bottom surface of the mold core 302. After the upper punch 2 and the lower punch 4 enter the cavity, they form a cavity corresponding to the shape of the latch body 1 with the forming part 302c, thereby completing the pressing of the latch body 1.

[0029] The first inlet portion 302a, the second inlet portion 302b, and the forming portion 302c have one end in the length direction as the beginning and the other end as the end. The ends of the first inlet portion 302a, the second inlet portion 302b, and the forming portion 302c are flush with each other and correspond to the end of the tongue of the latch body 1. The length of the first inlet portion 302a corresponds to the length of the top surface of the latch body 1, and the length of the second inlet portion 302b corresponds to the length of the bottom surface of the latch body 1. The beginning of the forming portion 302c forms an arc groove 303 that connects the beginning of the first inlet portion 302a and the beginning of the second inlet portion 302b. The curvature of the arc groove 303 corresponds to the curvature of the arc surface 103 of the tip of the latch body 1.

[0030] During pressing, the next punch 4 is first inserted into the cavity of the middle mold 3, and metal powder is filled into the cavity of the middle mold 3. Then, the upper punch 2 is inserted into the cavity of the middle mold 3 for pressing to complete the forming of the latch body 1. Since the arc groove 303 is used to form the arc surface 103 of the latch body 1, compared with the prior art which uses an arc-shaped forming sharp corner on the upper punch 2 to form the arc surface 103 of the latch body 1, the arc groove 303 in this embodiment is a groove body, which is uniformly stressed, has high strength, can reduce mold wear, is easy to process, and effectively reduces production costs. At the same time, the arc groove 303 is located inside the cavity and does not connect with the top and bottom openings of the cavity, avoiding the chamfering effect at the top opening of the cavity, which prevents the formation of sharp corners, and avoiding the chamfering effect at the bottom opening of the cavity, which prevents the formation of obvious joint marks, effectively improving the overall processing quality of the latch.

[0031] The mold core 302 has a powder discharge groove 304 on its top surface, which is connected to the first end of the first inlet 302a. During pressing, under the action of pressure, the redundant metal powder located at the first end of the first inlet 302a slides from the bottom to the top along the arc groove 303 and enters the powder discharge groove 304 to complete the discharge and collection. This avoids the accumulation of a large amount of redundant metal powder, which would affect the forming of the tongue tip of the latch body 1. It can also avoid excessive powder during molding, which would lead to high product density and wear or chipping of the mold.

[0032] It should be noted that the width of the powder running groove 304 is greater than the width of the first inlet part 302a, so as to improve the powder running efficiency and ensure the tongue tip of the locking tongue body 1 is formed.

[0033] The upper punch 2 has a first core rod insertion hole 201 parallel to the length direction, so that the forming core rod 6 entering the cavity can be inserted into the upper punch 2 to complete the forming of the locking hole 102 on the locking tongue body 1; the upper punch 2 has a slot 202 on one side, the top of the slot 202 is closed and the bottom end forms a slot opening that connects to the bottom surface of the upper punch 2, so that the lower punch 5 entering the cavity can cooperate with the slot 202 to complete the forming of the connecting groove 101 on the locking tongue body 1.

[0034] The next punch 4 is provided with a through groove 402 for the second punch 5 to pass through, so that when the mold is closed, the second punch 5 can pass through the next punch 4 and enter the cavity inside the mold core 302 to cooperate with the slot 202 of the upper punch 2; the next punch 4 is also provided with a second core rod insertion hole 401 for the forming core rod 6 to pass through, so that when the mold is closed, the forming core rod 6 can pass through the next punch and enter the cavity inside the mold core 302 to be inserted into the first core rod insertion hole 201 of the upper punch 2.

[0035] The lower second punch 5 is provided with a third core rod insertion hole 501 for the forming core rod 6 to pass through, so that when the mold is closed, the forming core rod 6 can pass through the lower second punch 5 and the lower punch 4 in sequence and enter the cavity inside the mold core 302 to insert into the first core rod insertion hole 201 of the upper punch 2.

[0036] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A powder metallurgy mortise processing die comprising, in the closing direction, an upper punch, a middle die, and a lower punch, the middle die having a cavity formed therein, characterized in that, The cavity comprises two guide-in parts for the upper punch and the next punch to extend into the cavity from the top and bottom of the middle mold respectively, and a forming part connecting the two guide-in parts, one end of the forming part forming an arc slot connecting the two guide-in parts; the middle mold is provided with a powder running groove at the top, the powder running groove connecting the guide-in part at the top end of the forming part and connecting with the arc slot.

2. The powder metallurgy strike latch processing die of claim 1, wherein, The two guide-in parts and the end of the forming part away from the arc slot are flush with each other, the length of the guide-in part at the top end of the forming part corresponds to the length of the top surface of the lock tongue body, and the length of the guide-in part at the bottom end of the forming part corresponds to the length of the bottom surface of the lock tongue body.

3. The powder metallurgy strike latch processing die of claim 1, wherein, The arc of the arc slot corresponds to the arc of the tongue tip arc surface of the lock tongue body.

4. The powder metallurgy strike latch processing die of claim 1, wherein, The width of the powder running groove is greater than the width of the guide-in part at the top end of the forming part.

5. The powder metallurgy strike latch processing die of any of claims 1-4, wherein, The next punch is provided with a second punch, which is used to extend into the cavity to form a connecting slot on the lock tongue body after penetrating through the next punch when the mold is closed.

6. The powder metallurgy strike latch processing die of claim 5, wherein, The second punch is provided with a forming core rod, which is used to extend into the cavity to form a clamping hole on the lock tongue body after penetrating through the second punch and the next punch in sequence when the mold is closed.

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