A metal powder injection molding green body demolding mechanism
The demolding mechanism, composed of a bracket, support rod, impact block, and impact seat, combined with an electric motor and photoelectric sensor, solves the problems of complex, high-cost, and difficult-to-maintain demolding mechanisms in the existing technology, and achieves efficient and low-cost demolding effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HIGH MAG TECH (SHENZHEN) CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-03
AI Technical Summary
Existing metal powder injection molding demolding mechanisms are complex in structure, have high manufacturing costs, are difficult to maintain, have poor adaptability, and are difficult to demold efficiently.
The demolding mechanism consists of a bracket, a support rod, an impact block, and an impact seat. The impact block is driven by a cam driven by an electric motor to impact the impact seat, and the impact frequency and intensity are adjusted. The demolding is assisted by a photoelectric sensor and a buzzer.
It achieves a simple and low-cost demolding process, is easy to maintain, highly adaptable, and has high demolding efficiency, making it suitable for various thin-walled and hollow metal parts.
Smart Images
Figure CN224444594U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metal powder injection molding technology, and specifically to a demolding mechanism for metal powder injection molded preforms. Background Technology
[0002] Metal powder injection molding (MIM) is a near-net-shape forming technology that integrates the principles of powder metallurgy and plastic injection molding, enabling the efficient and precise manufacturing of complex-shaped metal parts. It mainly includes the following core processes: 1. Feed preparation: Micron-sized metal powder (particle size ≤30μm, such as titanium alloys, high-temperature alloys, etc.) is mixed with organic binders (paraffin wax, polyolefins, etc.) in a specific ratio, and then heated and plasticized to form a free-flowing granular feed. 2. Injection molding: The feed is heated to 150-200℃ and melted using a specialized injection molding machine, then injected under high pressure into the mold cavity. After cooling, a "green preform" is formed. The mold design must allow for sintering shrinkage (usually 15-20%) to control the final dimensions. 3. Debinding treatment: More than 90% of the binder in the green preform is removed through solvent extraction or thermal decomposition, forming a porous framework structure. The debinding rate and uniformity directly affect the subsequent sintering quality. 4. Sintering and post-treatment: Densification sintering is carried out at high temperature (1200-1400℃) and under a controlled atmosphere, achieving a density of 95-99% of the theoretical value. Some products require further performance enhancement through hot isostatic pressing (HIP) or surface treatment.
[0003] The preform obtained by the above method is covered with lipids. As is known, lipids become sticky after cooling, making it generally difficult to demold and remove the preform. Application No. 202221678086X discloses a demolding mechanism for a metal powder injection molding die, belonging to the field of injection molding dies. The demolding mechanism for a metal powder injection molding die includes a fixed template, a fixed mold base, a moving template, a pad, a moving mold base, and an ejector plate. A guide post is installed on the ejector plate. A torsion spring is fixedly connected between the mounting plate and the limiting plate. The torsion spring is sleeved on the mounting shaft. A rectangular rod is fixedly connected to the ejector plate. Multiple push blocks are fixedly connected to the rectangular rod. A lever is rotatably connected to the mounting plate. The multiple push blocks alternately abut against the lever. A stop block is fixedly connected to the mounting plate above the lever. The stop block abuts against the lever. This invention allows the pusher blocks fixedly connected to the rectangular rod to alternately push the pusher blocks upward while the ejector plate moves, causing the striking block on the top of the mounting plate to strike the moving mold base, thus vibrating the product inside the mold core on the moving mold base and assisting in the separation of the product from the mold core.
[0004] The existing technology described above removes the green blank from the mold core through vibration, but it still has the following problems: 1. The above demolding mechanism has a complex structure and high manufacturing cost. Its operation depends on other parts of the mold, making maintenance difficult; 2. It has poor adaptability. The vibration frequency and intensity are fixed. When the green blank is small, it is difficult to demold the green blank by using a fixed frequency and intensity. Utility Model Content
[0005] This invention proposes a demolding mechanism for metal powder injection molded preforms, which solves the problems of existing demolding mechanisms for metal injection molding being complex in structure, high in manufacturing cost, difficult to maintain, and poor adaptability.
[0006] The technical solution of this utility model is as follows: a demolding mechanism for metal powder injection molded preform, including a moving mold, a fixed mold, a motor, and a cam. The fixed mold is equipped with a punch, and the moving mold is equipped with a corresponding die. Guide pillars are installed at the four corners of the fixed mold, and guide sleeves are installed at the four corners of the moving mold. Cooling water channels are connected to the cooling water channels in the punch within the fixed mold. The mechanism also includes a bracket, a support rod, an impact block, and an impact seat. The fixed mold, moving mold, and punch have grooves on the side where they fit together. A bracket is detachably connected to the outer wall of the punch. The bracket is L-shaped. A support rod is rotatably connected to one end of the bracket. A torsion spring is installed on the rotating shaft. An impact block is located at the top of the support rod. An impact seat is located at the corresponding position on the top of the bracket. A motor is installed in the middle of the bracket. A cam is connected to the output shaft of the motor. When the cam rotates, it fits against the inner wall of the bracket.
[0007] Preferably, a heat insulation pad is provided between the bracket and the punch.
[0008] Preferably, the impact block is slidably connected to the support rod, and the top of the impact block has a locking bolt.
[0009] Preferably, the impact seat is connected to the bracket by bolts.
[0010] Preferably, the bracket and the punch are connected by bolts.
[0011] Preferably, the bracket is made of stainless steel.
[0012] Preferably, the support rod is made of high carbon steel and undergoes surface heat quenching treatment.
[0013] Preferably, the impact block and impact seat are made of high-strength steel and have undergone surface nitriding treatment.
[0014] Preferably, the photoelectric sensor is mounted on one side of the punch.
[0015] Preferably, the buzzer is mounted on a bracket.
[0016] The principle of this utility model: This utility model solves the problems of complex structure, high manufacturing cost, difficult maintenance, and poor adaptability of existing demolding mechanisms for metal injection molding through the following technical solution. This utility model installs a demolding mechanism on one side of the punch. The moving mold and fixed mold need to have grooves cut to avoid the demolding mechanism. The demolding mechanism mainly consists of a bracket, a support rod, an impact block, and an impact seat. The bracket is L-shaped, with a support rod rotatably connected to the bottom end of the bracket. A torsion spring connects the two, and the end of the support rod, under the torque of the torsion spring, fits against the top of the bracket. An impact seat is installed on the inner wall of the bracket, and an impact block is installed at the end of the support rod. The impact block slides on the support rod and is fixed in position by a locking bolt. In this way, the impact strength between the impact block and the impact seat is adjustable. When a larger impact force is required, simply adjust the impact block... Installed at the end of the support rod, a large impact force can be obtained. The support rod obtains kinetic energy through the cam that fits against it. When the cam rotates to the highest point, the support rod obtains the maximum rise. When the cam gradually rotates to the lowest point, under the action of the torsion spring torque, the impact block hits the impact seat, completing one strike. Driven by the motor, the impact block repeatedly hits the impact seat, completing the demolding operation. By adjusting the motor speed, the impact frequency between the impact block and the impact seat can be adjusted. By adjusting the impact frequency and intensity, the parameters with the highest demolding efficiency of the mold core can be obtained, significantly improving the adaptability of this utility model.
[0017] The beneficial effects of this utility model are as follows: A metal powder injection molding preform demolding mechanism has a scientific and reasonable structural design, low manufacturing cost, stable and reliable operation, independent operation of the mechanism, convenient maintenance, low maintenance cost, adjustable impact intensity and frequency of the demolding mechanism, strong adaptability, and high demolding efficiency. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the structure of this utility model;
[0020] Figure 3 This is a right view of the present invention;
[0021] In the diagram, 101-moving mold, 102-fixed mold, 103-punch, 104-guide pillar, 105-cooling water channel, 106-bracket, 107-support rod, 108-impact block, 109-motor, 110-cam, 111-impact seat, 112-heat insulation pad. Detailed Implementation
[0022] The specific implementation method of this utility model is as follows: Figure 1 , Figure 2 , Figure 3As shown, a metal powder injection molding preform demolding mechanism includes a moving mold 101, a fixed mold 102, a motor 109, and a cam 110. The fixed mold 102 is fitted with a punch 103, and the moving mold 101 is fitted with a corresponding die. Guide pillars 104 are installed at the four corners of the fixed mold 102, and guide sleeves are correspondingly installed at the four corners of the moving mold 101. Cooling channels 105 within the fixed mold 102 are connected to cooling channels within the punch 103. The mechanism also includes a bracket 106, a support rod 107, an impact block 108, and an impact seat 111. The mold 101 has a groove on the side where it fits with the punch 103. A bracket 106 is detachably connected to the outer wall of the punch 103. The bracket 106 is L-shaped, and a support rod 107 is rotatably connected to one end of the bracket 106. A torsion spring is mounted on the rotating shaft. An impact block 108 is located at the top of the support rod 107, and an impact seat 111 is located at the corresponding position on the top of the bracket 106. A motor 109 is mounted in the middle of the bracket 106, and a cam 110 is connected to the output shaft of the motor 109. When the cam 110 rotates, it fits against the inner wall of the bracket 106. This invention is widely used for the preform forming of components such as robotic surgical forceps electrode metal parts, minimally invasive surgical forceps, endoscope components, suture needles, bionic joint prostheses, bone repair materials, laparoscopic components, and cardiovascular interventional devices. These metal parts are mostly thin-walled, hollow structures with small mass, making preform demolding difficult. This invention can provide various vibration intensities and frequencies to assist in mold core demolding and improve production efficiency.
[0023] Specifically, such as Figure 2 , Figure 3 As shown, a heat insulation pad 112 is provided between the bracket 106 and the punch 103. In this embodiment, the heat insulation pad 112 can prevent heat from radiating from the punch 103 to the bracket 106, avoid damage to the motor 109 due to heat, and ensure the stable operation of this utility model.
[0024] Specifically, such as Figure 2 , Figure 3 As shown, the impact block 108 is slidably connected to the support rod 107, and a locking bolt is located on the top of the impact block 108. In this embodiment, the impact block 108 and the support rod 107 are detachably connected, and the impact block 108 is a consumable component, making it convenient to replace and maintain.
[0025] Specifically, such as Figure 2 , Figure 3 As shown, the impact seat 111 and the bracket 106 are connected by bolts. In this embodiment, the impact seat 111 and the bracket 106 are detachably connected. The impact seat 111 is a consumable part, which is convenient for replacement and maintenance.
[0026] Specifically, such as Figure 2 , Figure 3As shown, the bracket 106 and the punch 103 are connected by bolts. In this embodiment, when it is necessary to modify the existing mold, it is only necessary to drill holes and tap the side wall of the punch 103, and cut grooves at corresponding positions of the moving mold 101 and the fixed mold 102 to complete the modification. The modification cost is low and quick.
[0027] Specifically, the bracket 106 is made of stainless steel. In this embodiment, the stainless steel bracket 106 is corrosion-resistant, high-temperature resistant, and has a long service life.
[0028] Specifically, the support rod 107 is made of high-carbon steel and undergoes surface heat quenching treatment. In this embodiment, the support rod 107, made of high-carbon steel and subjected to surface heat quenching treatment, achieves higher hardness and a longer service life.
[0029] Specifically, the impact block 108 and impact seat 111 are made of high-strength steel and have undergone surface nitriding treatment. In this embodiment, the impact block 108 and impact seat 111 made of high-strength steel have a long service life.
[0030] Specifically, the photoelectric sensor is installed on one side of the punch 103. In this embodiment, the photoelectric sensor is used to identify the mold core detachment. Once the mold core detaches, the motor 109 stops working. Of course, this solution also involves components such as a microcontroller, which will not be described in detail here.
[0031] Specifically, the buzzer is mounted on the bracket 106. In this embodiment, the buzzer is combined with a photoelectric sensor. If the mold core fails to detach under vibration, the buzzer will sound an alarm, and the operator will need to perform manual demolding.
[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A demolding mechanism for a metal powder injection molded preform, comprising a moving mold (101), a fixed mold (102), a motor (109), and a cam (110), wherein the fixed mold (102) is fitted with a punch (103), the moving mold (101) is fitted with a corresponding die, guide pillars (104) are installed at the four corners of the fixed mold (102), and guide sleeves are correspondingly installed at the four corners of the moving mold (101), and a cooling water channel (105) is provided in the fixed mold (102) and connected to the cooling water channel in the punch (103), characterized in that: It also includes a bracket (106), a support rod (107), an impact block (108), and an impact seat (111). The fixed mold (102) and the moving mold (101) have grooves on the side that are in contact with the punch (103). The outer wall of the punch (103) is detachably connected to the bracket (106). The bracket (106) is "L" shaped. One end of the bracket (106) is rotatably connected to the support rod (107). A torsion spring is installed on the rotating shaft. The top of the support rod (107) has an impact block (108). The top of the bracket (106) has an impact seat (111) at the corresponding position. The middle of the bracket (106) is equipped with a motor (109). The output shaft of the motor (109) is connected to a cam (110). When the cam (110) rotates, it is in contact with the inner wall of the bracket (106).
2. A metal powder injection moulding green body release mechanism according to claim 1, characterised in that: There is a heat insulation pad (112) between the bracket (106) and the punch (103).
3. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The impact block (108) is slidably connected to the support rod (107), and there is a locking bolt on the top of the impact block (108).
4. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The impact seat (111) and the bracket (106) are connected by bolts.
5. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The bracket (106) and the punch (103) are connected by bolts.
6. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The bracket (106) is made of stainless steel.
7. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The support rod (107) is made of high carbon steel and has undergone surface heating and quenching treatment.
8. A metal powder injection molding green body ejection mechanism according to claim 1, characterized in that: The impact block (108) and impact seat (111) are made of high-strength steel and have undergone surface nitriding treatment.
9. The demolding mechanism for a metal powder injection molded preform according to claim 1, characterized in that: It also includes a photoelectric sensor, which is mounted on one side of the punch (103).
10. A metal powder injection moulding green body release mechanism according to claim 9, characterised in that: It also includes a buzzer, which is mounted on a bracket (106).