Powder metallurgy dumbbell compression molding die

Abstract

A compression forming die for a powder metallurgy dumbbell comprises an upper die part, a middle die plate, a lower die part, an upper die stripping driving part, a lower die stripping driving part, a dumbbell head upper die core, a feeder, an operation table and a material receiving plate. Through the combination of an upper die part, a middle die plate, a lower die part, an upper die stripping driving part, a lower die stripping driving part, a dumbbell head upper die core, a feeder, an operation table and a material receiving plate which are of a specific structure, powder metallurgy powder is pressed at a time, and a powder metallurgy precision dumbbell product can be obtained. The defects of large boundary dimension precision error, rough surface, high energy consumption, heavy pollution, no energy conservation, environmental protection, long production period and high cost in the production of cast iron type steel dumbbell products can be overcome. Energy can be saved, consumption can be reduced, the production cycle can be shortened, the production cost can be reduced, the product quality can be improved, and the market competitiveness can be improved.

Description

Technical Field

[0001] The utility model relates to a forming and processing technology of powder pressed parts, in particular to a mold for precisely pressing a bell using powder metallurgy powder and a use method thereof. Background Art

[0002] With the rapid development of modern technology, machines are increasingly replacing human labor. The application of AI has accelerated the pace of machines doing our work. As a result, people have fewer opportunities to engage in physical labor, and their daily activity time, volume, and intensity are decreasing. Sedentary time using electronic devices such as computers and mobile phones is increasing, and people's health indicators are declining. In today's fast-paced lives, high-pressure jobs, and dwindling time for exercise, people are increasingly recognizing the importance of fitness and exercise to improve their health. More and more people are using exercise to relieve stress, strengthen their physique, and maintain their health.

[0003] As a simple and effective fitness equipment, dumbbells have gained more and more favor among consumers. In recent years, with the rise of fitness trends, people's demand for fitness equipment has increased year by year, and the dumbbell market has ushered in rapid growth. Currently, the finished dumbbells on the market can be divided into the following two types according to their production methods:

[0004] The first type is a steel dumbbell that is cast as a whole.

[0005] The second type is a steel dumbbell that is cast in parts and then assembled and welded into one. The head and rod of this dumbbell are cast separately, and then undergo precision machining to ensure that the head and rod reach the pre-designed surface accuracy and dimensional accuracy respectively. Finally, the head and rod are precisely docked and welded to form the entire dumbbell.

[0006] Regardless of the structure of the cast iron dumbbell, there are the following defects:

[0007] ① The finished product of cast iron steel dumbbell has large dimensional accuracy error and rough surface, and must be machined, ground and polished. The casting production process increases energy consumption and causes heavy pollution. It is neither energy-saving nor environmentally friendly. The production cycle is long and the cost remains high. At present, this type of product will gradually withdraw from the market.

[0008] ② For steel cast dumbbells with a split assembly structure, although the bell head and the bell rod are cast and processed separately, the defects of the castings still exist. At the same time, the two dumbbell heads and the dumbbell rod need to be finely processed before they can be assembled and welded into a whole. Moreover, the processing steps are more numerous and complicated, and the workload is larger.

[0009] The production of existing cast dumbbells is limited due to factors such as environmental protection and energy conservation. At the same time, product precision and price factors also make steel cast dumbbells lose their market competitiveness.

[0010] After a long period of research, the applicant invented a precision dumbbell that does not require processing by using powder metallurgy powder through isodensity pressing. This powder metallurgy precision pressed dumbbell includes a dumbbell head A and a dumbbell handle B pressed by powder metallurgy. The two dumbbell heads A are symmetrically distributed at the two ends of the dumbbell handle B. The two dumbbell heads A have a regular hexagonal cross-section with arc surfaces on the end faces. The dumbbell handle B is a rod-shaped body with an arc that is small at both ends and large in the middle. The axis of the dumbbell handle B is collinear with the center line of the two dumbbell heads A. The diameter of the dumbbell handle B is smaller than the outer dimensions of the dumbbell head A.

[0011] According to the structural shape and size requirements of the dumbbell finished product, a combined compression molding method of an upper mold part, a middle template and a lower mold part is adopted. The molding compression ratio of the powder metallurgy powder is determined according to the powder properties of the powder metallurgy and the specific density requirements of the dumbbell to be pressed. The upper mold cavity is the cavity above the parting surface of the finished product, and the middle mold is the through-hole cavity of the parting surface of the finished product. The lower mold part is provided with a bell head lower punch 32 and a bell rod lower punch 33 that cooperate with the through-hole cavity on the middle template to form a dumbbell head A powder-containing molding cavity and a dumbbell handle B powder-containing molding cavity. When the upper mold part, the middle template and the lower mold part are closed, the dumbbell finished product formed by compression molding of the powder metallurgy powder located between the upper mold part and the middle template can be ejected from the upper and lower molds for easy removal.

[0012] This solution ideally addresses the problems associated with existing steel casting dumbbells and their production. It features a simple process, a short production cycle, energy conservation, and environmental protection. It also delivers high-quality, smooth surfaces, and precise dimensions. The minimal mechanical effort required for press molding eliminates the challenges associated with existing steel casting dumbbells. Utility Model Content

[0013] The utility model aims to provide a powder metallurgy bell pressing and forming die, which can use powder metallurgy powder to press out a precise integral bell of equal density at one time.

[0014] The technical solutions adopted by this utility model are as follows:

[0015] A powder metallurgy bell pressing mold, characterized in that it includes an upper mold component, a middle mold plate, a lower mold component, an upper ejection drive component, a lower ejection drive component, a bell head mold core, a feeder, an operating table and a receiving plate, the upper mold component includes an upper mold forming plate, a vertical connecting block, a linkage plate and an upper fixed plate, the upper mold forming plate is fixedly connected to the upper fixed plate by two spaced vertical connecting blocks, the linkage plate is arranged between the upper mold forming plate and the upper fixed plate, the bell head mold core is fixed on the linkage plate, an upper ejection drive component is provided between the upper fixed plate and the linkage plate, the upper ejection drive component drives the bell head mold core and the linkage plate The plate combination performs a lifting action relative to the upper mold forming plate to meet the requirements of molding and demoulding action; the lower mold component includes a base, a bell head lower punch, a bell rod lower punch, a molding limit block, an increasing connection block, a lower lifting seat and a lower mold fixing plate, the lower mold fixing plate is fixed to the base through two increasing connection blocks, the two bell head lower punches are fixed to the lower mold fixing plate, the bell rod lower punch is located between the two bell head lower punches and is fixed on the lower lifting seat, the lower lifting seat is arranged between the base and the lower mold fixing plate, and the lower lifting seat can be lifted and lowered by the lower demoulding driving component and installed on the base; the molding limit block is fixed to the base and is located below the lower lifting seat;

[0016] A through-hole middle mold cavity is provided on the middle template, and the cross-sectional shape of the through-hole middle mold cavity is the same as the cross-sectional shape of the dumbbell finished product at the parting surface. The through-hole middle mold cavity includes a bell head through hole and a bell rod through hole. The bell head lower punch and the bell rod lower punch are respectively inserted into the bell head through hole and the bell rod through hole of the middle template. The upper mold forming plate is arranged above the middle template, and the operating table is fixedly installed on the middle template. The upper end surface of the middle template is flush with the upper surface of the operating table. The feeder is arranged on the upper end surface of the operating table. The feeder can move back and forth along the upper end surface of the operating table. The cross-sectional area of the feeding port of the feeder is larger than the upper opening cross-sectional area of the through-hole middle mold cavity of the middle template, so as to ensure that the powder in the middle and at both ends of the through-hole middle mold cavity of the middle template is evenly distributed when feeding; the two bell head lower punches are located on the left and right sides of the bell rod lower punch, and the two bell head lower punches are fixed on the lower mold fixing plate, and the bell rod lower punch is controlled by the lower demoulding drive component to move up and down.

[0017] Furthermore, a dumbbell upper cavity is provided on the lower end surface of the upper mold forming plate. The dumbbell upper cavity has the same outer dimensions as the upper half of the dumbbell parting surface. The dumbbell upper cavity includes two bell head cavities and one bell handle cavity. The two bell head cavities are symmetrically arranged at both ends of the bell handle cavity. A slot for installing the bell head upper mold core is provided above the bell head cavity.

[0018] Furthermore, the linkage plate is a split assembly structure, including a longitudinal connecting rod and a transverse connecting rod. The two longitudinal connecting rods are distributed left and right, and the two longitudinal connecting rods are parallel to the bell handle cavity in the dumbbell upper cavity on the lower end surface of the upper mold forming plate. The two transverse connecting rods are distributed front and back, and the two ends of the two transverse connecting rods are respectively fixedly connected to the two ends of the two longitudinal connecting rods into one body. The cylinder body of the upper ejection driving component is fixed on the upper fixed plate, and the telescopic rod of the upper ejection driving component is connected to the longitudinal connecting rod.

[0019] Furthermore, the longitudinal connecting rod is U-shaped, the two transverse connecting rods are fixedly connected to the two ends of the longitudinal connecting rod respectively, and the telescopic rod of the upper demoulding drive component is connected to the middle position of the longitudinal connecting rod.

[0020] Furthermore, the lower lifting seat includes a floating base and two symmetrically distributed connecting ear seats, the two connecting ear seats are fixed on the floating base, the cylinder body of the lower demoulding drive component is fixed on the base, and the telescopic rod of the lower demoulding drive component is connected to the connecting ear seats.

[0021] Furthermore, the upper demoulding drive component and the lower demoulding drive component are both hydraulic cylinders, pneumatic telescopic cylinders, or electric telescopic cylinders.

[0022] This powder metallurgy dumbbell pressing mold can use powder metallurgy powder as raw material to precisely press dumbbell products. This mold is designed with feeding mold cavities for the dumbbell head and the dumbbell handle respectively according to the external dimension requirements of the dumbbell finished product. Powder metallurgy powder is added to the mold cavity of the mold head and the mold cavity of the handle through a feeder. Then, through the specific mold closing and compression of the upper mold component, the middle mold component and the lower mold component, a dumbbell finished product with density and external shape that meet the requirements can be pressed. The mold structure is simple and the pressing is convenient and fast. It fills the gap in the lack of powder metallurgy precision pressed dumbbells in China, provides people with a solution for powder metallurgy precision pressed dumbbells, and solves various defects in the existing casting dumbbell production. The precision dumbbells pressed by powder metallurgy have uniform pressed density, high external dimension accuracy, good surface quality, and weight accuracy within 5 grams / kilogram compared with the precision error of cast dumbbells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the finished dumbbell to be pressed;

[0024] Figure 2 This is a schematic diagram of the structure of the utility model

[0025] Figure 3 for Figure 2 Right view;

[0026] Figure 4 for Figure 2 Middle CC section view;

[0027] Figure 5This is a schematic diagram of the utility model after the centering template is charged with material;

[0028] Figure 6 This is a schematic structural diagram of the upper mold component and the middle mold plate in the mold closing state of the utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the powder metallurgy precision pressed dumbbell during pressing and forming;

[0030] Figure 8 This is a schematic diagram of the structure of the powder metallurgy precision pressed dumbbell in the upper mold release state;

[0031] Figure 9 This is a schematic diagram of the structure of the powder metallurgy precision pressed dumbbell in the lower demoulding state;

[0032] Figure 10 Schematic diagram of the structure of the upper mold component;

[0033] Figure 11 It is the structural diagram of the middle template;

[0034] Figure 12 Schematic diagram of the three-dimensional structure of the lower mold component;

[0035] Figure 13 It is a schematic diagram of the split assembly structure of the lower lifting seat;

[0036] In the figure: A is the dumbbell head; B is the dumbbell handle; H1 is the feeding height of the dumbbell head forming cavity in the middle template, that is, the distance between the top surface of the middle template and the top surface of the dumbbell head lower punch; H2 is the feeding height of the dumbbell shaft forming cavity, that is, the distance between the top surface of the dumbbell shaft lower punch and the top surface of the middle template 2;

[0037] 1-upper mold component; 2-middle mold plate; 3-lower mold component; 4-upper demoulding drive component; 5-lower demoulding drive component; 6-bell head upper mold core; 7-feeder; 8-operating table; 9-receiving plate; 10-upper cavity; 101-bell head cavity; 102-bell handle cavity; 11-upper mold forming plate; 12-vertical connecting block; 13-linking plate; 131-longitudinal connecting rod; 132-transverse connecting rod; 14-upper fixed plate; 21-through-hole-shaped middle mold cavity; 211-bell head through hole; 212-bell rod through hole; 31-base; 32-bell head lower punch; 33-bell rod lower punch; 34-forming limit block; 35-heightening connecting block; 36-lower lifting seat; 361-connecting ear seat; 362-floating bottom plate; 37-lower mold fixing plate. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is described below with reference to the accompanying drawings:

[0039] Example 1: A powder metallurgy pressed dumbbell, such as Figure 1 As shown, it includes a dumbbell head A and a dumbbell handle B pressed by powder metallurgy. The two dumbbell heads A are symmetrically distributed at the two ends of the dumbbell handle B. The two dumbbell heads A have a regular hexagonal cross-section with arc surfaces on the end faces. The dumbbell handle B is a rod-shaped body with an arc that is small at the two ends and large in the middle. The axis of the dumbbell handle B is collinear with the center line of the two dumbbell heads A. The diameter of the dumbbell handle B is smaller than the outer dimensions of the dumbbell head A.

[0040] A powder metallurgy dumbbell pressing mold, such as Figure 2-13As shown, it includes an upper mold component 1, a middle mold plate 2, a lower mold component 3, an upper ejection drive component 4, a lower ejection drive component 5, a bell head mold core 6, a feeder 7, an operating table 8 and a receiving plate 9. The upper mold component 1 includes an upper mold forming plate 11, a vertical connecting block 12, a linkage plate 13 and an upper fixed plate 14. A dumbbell upper cavity 10 is provided on the lower end surface of the upper mold forming plate 11. The outer dimensions of the dumbbell upper cavity 10 are the same as those of the upper half of the dumbbell parting surface. The dumbbell upper cavity 10 includes two bell head cavities 101 and a bell handle cavity 102. The two bell head cavities 101 are symmetrically arranged at both ends of the bell handle cavity 102. A slot for installing the bell head mold core 6 is provided above the bell head cavity 101. The upper mold forming plate 11 is fixedly connected to the upper fixed plate 14 through two vertical connecting blocks 12 arranged at intervals. The linkage plate 13 is arranged between the upper mold forming plate 11 and the upper fixed plate 14. The bell head mold core 6 is fixed on the linkage plate 13. An upper demoulding driving component 4 is provided between the upper fixed plate 14 and the linkage plate 13. The upper demoulding driving component 4 drives the bell head mold core 6 and the linkage plate 13 to move. The combination performs a lifting action relative to the upper mold forming plate 11 to meet the requirements of molding and demoulding; the lower mold component 3 includes a base 31, a bell head lower punch 32, a bell rod lower punch 33, a molding limit block 34, an increasing connecting block 35, a lower lifting seat 36 and a lower mold fixing plate 37, the lower mold fixing plate 37 is fixed to the base 31 by two increasing connecting blocks 35, the two bell head lower punches 32 are fixed to the lower mold fixing plate 37, the bell rod lower punch 33 is located between the two bell head lower punches 32, and is fixed on the lower lifting seat 36, the lower lifting seat 36 is arranged between the base 31 and the lower mold fixing plate 37, and the lower lifting seat 36 can be lifted and installed on the base 31 by the lower demoulding driving component 5; the molding limit block 34 is fixed to the base 31 and is located below the lower lifting seat 36; A through-hole mold cavity 21 is provided on the middle template 2. The cross-sectional shape of the through-hole mold cavity 21 is the same as the cross-sectional shape of the dumbbell finished product at the parting surface. The through-hole mold cavity 21 includes a bell head through hole 211 and a bell rod through hole 212. The bell head lower punch 32 and the bell rod lower punch 33 are respectively inserted into the bell head through hole 211 and the bell rod through hole 212 of the middle template 2. The upper mold forming plate 11 is arranged above the middle template 2. The operating table 8 is fixedly installed on the middle template 2. The upper end surface of the middle template 2 is flush with the upper surface of the operating table 8. The feeder 7 is arranged on the upper end surface of the operating table 8, and the feeder 7 can be moved back and forth along the upper end surface of the operating table 8. The cross-sectional area of the feeding port of the feeder 7 is larger than the upper opening cross-sectional area of the through-hole-shaped middle mold cavity 21 of the middle template 2, so as to ensure that the powder in the middle and at both ends of the through-hole-shaped middle mold cavity 21 of the middle template 2 is evenly distributed when feeding; the two bell head lower punches 32 are located on the left and right sides of the bell rod lower punch 33, and the two bell head lower punches 32 are fixed on the lower mold fixing plate 37, and the bell rod lower punch 33 is controlled by the lower demoulding drive component 5 to move up and down.

[0041] In this example, the linkage plate 13 is a split assembly structure, including a longitudinal connecting rod 131 and a transverse connecting rod 132. The two longitudinal connecting rods 131 are distributed left and right, and the two longitudinal connecting rods 131 are parallel to the handle in the dumbbell upper cavity 10 on the lower end surface of the upper mold forming plate 11. The two transverse connecting rods 132 are distributed front and back, and the two ends of the two transverse connecting rods 132 are respectively fixedly connected to the two ends of the two longitudinal connecting rods 131 to form a whole. The cylinder body of the upper ejection drive component 4 is fixed on the upper fixed plate 14. The longitudinal connecting rod 131 is U-shaped, and the two transverse connecting rods 132 are respectively fixedly connected to the two ends of the longitudinal connecting rod 131. The telescopic rod of the upper ejection drive component 4 is connected to the middle position of the longitudinal connecting rod 131.

[0042] The lower lifting seat 36 includes a floating base plate 361 and two symmetrically distributed connecting ear seats 362. The two connecting ear seats 362 are fixed on the floating base plate 361. The cylinder body of the lower mold ejection driving component 5 is fixed on the base 31. The telescopic rod of the lower mold ejection driving component 5 is connected to the connecting ear seats 362.

[0043] The upper ejection drive component 4 and the lower ejection drive component 5 are both hydraulic cylinders, pneumatic telescopic cylinders, or telescopic electric cylinders.

[0044] Method for using this powder metallurgy dumbbell pressing mold:

[0045] Step 1: Add powder;

[0046] Powder feeding requirements: The dumbbells to be pressed are divided into dumbbell heads A and dumbbell handles B. The vertical cross-section of the two dumbbell heads A is a regular hexagon, and the end face of the dumbbell head A has an arc surface. The dumbbell handle B is a rod-shaped body with small ends and a large middle. The axis of the dumbbell handle B is collinear with the center line of the two dumbbell heads A. The diameter of the dumbbell handle B is smaller than the outer dimensions of the dumbbell head A. According to the structural shape and size requirements of the finished pressed dumbbell, combined with the compression ratio characteristics of the powder metallurgy powder and the density requirements of the dumbbell to be pressed, the molding compression ratio of the powder metallurgy powder is determined. In this case, it is 2:1. According to the molding compression ratio, the molding compression ratio of the dumbbell heads A at both ends is calculated respectively. The required powder feeding height in the cavity is H1, and the feeding height in the forming cavity of the dumbbell handle part B is H2. Two bell head lower punches 32 and a bell rod lower punch 33 are inserted into the through-hole-shaped middle mold cavity 21, and the two bell head lower punches 32 are located on the left and right sides of the bell rod lower punch 33. The two bell head lower punches 32 are fixed on the lower mold fixing plate 37, and the bell rod lower punch 33 is controlled by the lower demoulding driving component 5 to move up and down. During feeding, the middle template 2 floats to the position of the required feeding height H1 of the bell head lower punch 32, that is, the distance between the top surface of the middle template 2 and the top surface of the bell head lower punch 32 is H1, and the upper demoulding driving component 4 works to raise the top surface of the bell rod lower punch 33 to a distance of H2 from the top surface of the middle template 2. The feeder 7 pushes forward to fill the mold cavity of the middle template 2 with material, and then the feeder 7 retreats to the receiving plate 9 of the operating table;

[0047] Step 2: Product pressing

[0048] Pressing action 1: After the through-hole-shaped mold cavity 21 of the middle mold plate 2 is filled with a suitable volume of powder according to the product shape requirements, the upper mold forming plate 11, the bell head mold core 6, the upper mold driving component 4 and the upper fixed plate 14 move downward synchronously. When the upper mold forming plate 11 moves down to contact the upper surface of the middle mold plate 2, it is completed;

[0049] Pressing action 2: After the upper die forming plate 11 is pressed down onto the upper surface of the middle die plate 2, the middle die plate 2 moves downward together with the upper die forming plate 11. Because the lower ejection driving component 5 has an overflow function, it is under pressure and drives the bell rod lower punch 33 to move downward. When the combination of the bell rod lower punch 33 and the lower lifting seat 36 drops to contact the forming limit block 34, it stops. At this time, the two bell head lower punches 32 and the bell rod lower punch 33 have reached the ultimate position for the final pressing and forming of the product;

[0050] Step 3: Remove the finished dumbbell from the mold;

[0051] Demolding action 1: The finished dumbbell is demolded from the upper die forming plate 11: After the finished dumbbell is pressed and formed, the pressure is maintained for a period of time, and the upper die forming plate 11 is depressurized and moves upward to separate from the middle die plate 2. The upper demolding driving component 4 works to move the core 6 on the bell head downward to eject the finished dumbbell from the upper cavity 10 of the upper die forming plate 11, and the pressed product is ejected from the upper cavity 10 in the upper die forming plate 11;

[0052] Demolding action 2: After the extruded dumbbell product is separated from the upper mold forming plate 11, the middle template 2 moves downward alone. At this time, the bell head lower punch 32 and the bell bar lower punch 33 remain stationary. When the middle template 2 moves down to the limit position, the dumbbell product is completely separated from the middle template 2;

[0053] Step 4: Take out the finished pressed dumbbell by hand or by a robot.

[0054] The above are only preferred implementation methods of the present invention. The protection scope of the present invention is not limited to the above embodiments. For ordinary technicians in this technical field, all technical solutions with equivalent functional replacements proposed without departing from the principles of the present invention belong to the protection scope of the present invention.

Claims

1. A powder metallurgy dumbbell pressing die, characterized by: The invention comprises an upper mold component (1), a middle mold plate (2), a lower mold component (3), an upper ejection driving component (4), a lower ejection driving component (5), a bell head upper mold core (6), a feeder (7), an operating table (8) and a material receiving plate (9), wherein the upper mold component (1) comprises an upper mold forming plate (11), a vertical connecting block (12), a linkage plate (13) and an upper fixed plate (14), wherein the upper mold forming plate (11) is fixedly connected to the upper fixed plate (14) through two vertical connecting blocks (12) arranged at intervals, the linkage plate (13) is arranged between the upper mold forming plate (11) and the upper fixed plate (14), the bell head upper mold core (6) is fixed on the linkage plate (13), and an upper ejection driving component (4) is provided between the upper fixed plate (14) and the linkage plate (13). ), the upper demoulding driving component (4) drives the bell head upper mold core (6) and the linkage plate (13) combination to perform a lifting action relative to the upper mold forming plate (11), meeting the molding and demoulding action requirements; the lower mold component (3) includes a base (31), a bell head lower punch (32), a bell rod lower punch (33), a molding limit block (34), an increased height connection block (35), a lower lifting seat (36) and a lower mold fixing plate (37), the lower mold fixing plate (37) is fixed to the base (31) through two increased height connection blocks (35), the two bell head lower punches (32) are fixed to the lower mold fixing plate (37), the bell rod lower punch (33) is located between the two bell head lower punches (32) and is fixed on the lower lifting seat (36), and the lower lifting seat (36) is set on the base ( 31) and the lower mold fixing plate (37), the lower lifting seat (36) can be lifted and lowered on the base (31) through the lower demoulding driving component (5); the forming limit block (34) is fixed on the base (31) and is located below the lower lifting seat (36); a through-hole-shaped middle mold cavity (21) is provided on the middle template (2), the cross-sectional shape of the through-hole-shaped middle mold cavity (21) is the same as the cross-sectional shape of the dumbbell finished product at the parting surface, the through-hole-shaped middle mold cavity (21) includes a bell head through hole (211) and a bell rod through hole (212), the bell head lower punch (32) and the bell rod lower punch (33) are respectively inserted into the bell head through hole (211) and the bell rod through hole (212) of the middle template (2), and the upper mold forming plate (11) is arranged above the middle template (2). The operating table (8) is fixedly mounted on the middle template (2), the upper end surface of the middle template (2) is flush with the upper surface of the operating table (8), the feeder (7) is arranged on the upper end surface of the operating table (8), and the feeder (7) can be moved forward and backward along the upper end surface of the operating table (8), and the feeding port cross-sectional area of the feeder (7) is larger than the upper opening cross-sectional area of the through-hole-shaped middle mold cavity (21) of the middle template (2), so as to ensure that the powder in the middle and both ends of the through-hole-shaped middle mold cavity (21) of the middle template (2) is evenly distributed when feeding; two bell head lower punches (32) are located on the left and right sides of the bell rod lower punch (33), the two bell head lower punches (32) are fixed on the lower mold fixing plate (37), and the bell rod lower punch (33) is controlled by the lower mold driving component (5) to realize the up and down movement.

2. The powder metallurgy dumbbell pressing die according to claim 1, wherein: A dumbbell upper cavity (10) is provided on the lower end surface of the upper mold forming plate (11). The dumbbell upper cavity (10) has the same outer dimensions as the upper half of the dumbbell parting surface. The dumbbell upper cavity (10) includes two bell head cavities (101) and a bell handle cavity (102). The two bell head cavities (101) are symmetrically arranged at both ends of the bell handle cavity (102). A slot for mounting a bell head upper mold core (6) is provided above the bell head cavity (101).

3. The powder metallurgy dumbbell pressing die according to claim 1, wherein: The linkage plate (13) is a split assembly structure, comprising a longitudinal connecting rod (131) and a transverse connecting rod (132), wherein the two longitudinal connecting rods (131) are distributed left and right, and the two longitudinal connecting rods (131) are parallel to the bell handle cavity (102) in the dumbbell upper cavity (10) on the lower end surface of the upper mold forming plate (11), and the two transverse connecting rods (132) are distributed front and back, and the two ends of the two transverse connecting rods (132) are respectively fixedly connected to the two ends of the two longitudinal connecting rods (131) to form a whole, the cylinder body of the upper ejection driving component (4) is fixed on the upper fixed plate (14), and the telescopic rod of the upper ejection driving component (4) is connected to the longitudinal connecting rod (131).

4. The powder metallurgy dumbbell pressing die according to claim 3, wherein: The longitudinal connecting rod (131) is U-shaped, and two transverse connecting rods (132) are fixedly connected to the two ends of the longitudinal connecting rod (131) respectively. The telescopic rod of the upper ejection driving component (4) is connected to the middle position of the longitudinal connecting rod (131).

5. The powder metallurgy dumbbell pressing die according to claim 1, wherein: The lower lifting seat (36) includes a floating base plate (361) and two symmetrically distributed connecting ear seats (362), the two connecting ear seats (362) are fixed on the floating base plate (361), the cylinder body of the lower ejection drive component (5) is fixed on the base (31), and the telescopic rod of the lower ejection drive component (5) is connected to the connecting ear seats (362).

6. The powder metallurgy dumbbell pressing die according to claim 1, wherein: The upper demoulding drive component (4) or the lower demoulding drive component (5) is a hydraulic cylinder.

7. The powder metallurgy dumbbell pressing die according to claim 1, wherein: The upper demoulding drive component (4) or the lower demoulding drive component (5) is a pneumatic telescopic cylinder.

8. The powder metallurgy dumbbell pressing die according to claim 1, wherein: The upper ejection drive component (4) or the lower ejection drive component (5) is a telescopic electric cylinder.

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