A powder metallurgy die upper and lower die special-shaped end face polishing jig and a use method thereof

Abstract

The application discloses a powder metallurgy mold upper and lower mold special-shaped end face polishing jig, the jig body is provided with a mold upper and lower mold containing hole in the vertical direction, a notch is symmetrically provided along the X-axis direction of the mold upper and lower mold containing hole, the depth of the notch is matched with the height of the chamfer tip of the special-shaped end face, the inclination angle of the inclined surface of the notch is matched with the inclination angle of the inclined surface of the chamfer tip of the special-shaped end face, the containing part of the chamfer tip of the special-shaped end face is symmetrically formed in the Y-axis direction of the mold upper and lower mold containing hole, when the special-shaped end face of the mold upper or lower mold is polished, the chamfer tip of the special-shaped end face is contained in the containing part of the jig body, the containing part can effectively protect the chamfer tip of the special-shaped end face, wear or deformation of the chamfer tip in the polishing process is avoided, and damage of the mold upper or lower mold is effectively avoided.

Description

Technical Field

[0001] This invention relates to the technical field of powder metallurgy mold processing, specifically to a polishing fixture for the upper and lower irregular-shaped end faces of a powder metallurgy mold and its usage method. Background Technology

[0002] Powder metallurgy is a process technology that uses metal powders (or mixtures of metal and non-metal powders) as raw materials, followed by forming and sintering, to manufacture metallic materials, composite materials, and various types of products. Powder metallurgy shares similarities with ceramic production, both belonging to powder sintering technology; therefore, a range of new powder metallurgy technologies can also be applied to the preparation of ceramic materials.

[0003] In powder metallurgy, after a period of use, the upper or lower mold faces of the die are typically polished to reduce powder adhesion and prevent powder sticking during demolding, as well as to improve surface finish. During polishing, the upper or lower mold face is fixed on a polishing device, protruding from the reference plane of the fixed fixture. Polishing is performed using a brush and polishing compound. If the upper or lower mold face is a regular shape, polishing has no effect. However, if the upper or lower mold face is irregularly shaped, for example, with a chamfered tip (only 0.1mm wide), polishing using the above method can easily cause the chamfered tip to wear or deform without protection, leading to damage to the upper or lower mold face. Summary of the Invention

[0004] Therefore, it is necessary to provide a polishing fixture for the irregularly shaped end faces of powder metallurgy molds and a method for using it. This can effectively avoid damage to the chamfered tips during the polishing process of the upper or lower end faces of the mold.

[0005] A polishing fixture for the upper and lower irregular end faces of a powder metallurgy mold includes a fixture body. The fixture body has upper and lower mold receiving holes in a vertical direction. Notches are symmetrically formed along the X-axis direction of the upper and lower mold receiving holes. The depth of the notches is adapted to the height of the chamfered tip of the irregular end face. The inclination angle of the notch slope is adapted to the inclination angle of the chamfered tip of the irregular end face. Receiving portions for the chamfered tips of the irregular end face are symmetrically arranged in the Y-axis direction of the upper and lower mold receiving holes. The fixture body has upper and lower mold fixing holes at preset positions on its side. The upper and lower mold fixing holes are connected to the upper and lower mold receiving holes.

[0006] In one embodiment, the top surface of the fixture body has a limiting component, which includes a rotating member and a baffle. One end of the baffle is mounted on the rotating member, and the bottom surface of the other end of the baffle is in contact with the top surface of the fixture body and is at least partially located at the top of the receiving portion in the vertical direction. The rotating member can drive the baffle to rotate in a preset direction.

[0007] In one embodiment, the notch is an inverted trapezoidal structure and is connected to the upper and lower accommodating holes of the mold.

[0008] In one embodiment, the powder metallurgy mold upper and lower irregular end face polishing fixture further includes a flexible buffer plate, which is installed in the inner layer of the receiving part and is used to wrap the outer layer of the chamfered tip of the irregular end face.

[0009] In one embodiment, the flexible buffer plate is made of one or more of silicone rubber, silicone rubber, or polyurethane rubber.

[0010] In one embodiment, the fixture body has a positioning notch on the side near the notch, the positioning notch being used for positioning the fixture when it is installed on a polishing device.

[0011] In one embodiment, the width of the notch is adapted to the width of the irregular end face.

[0012] In one embodiment, the fixture body is made of carbon fiber or titanium alloy.

[0013] A method for using a polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold, applicable to the polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold, the processing method comprising: Insert the irregular end face of the upper or lower mold to be polished into the fixture body from the bottom of the upper or lower mold receiving hole; The chamfered tip of the irregular end face is accommodated in the receiving part during the movement of the upper and lower mold receiving holes; The external fasteners abut against the upper or lower mold to be polished through the upper and lower mold fixing holes.

[0014] In one embodiment, the upper and lower fixing holes of the mold are provided with internal threads, which are threaded to engage with the external threads of the external fixing parts.

[0015] The aforementioned powder metallurgy mold upper and lower irregular end face polishing fixture has upper and lower mold receiving holes in the fixture body along the vertical direction. Notches are symmetrically formed along the X-axis of the upper and lower mold receiving holes. The depth of the notches matches the height of the chamfered tip of the irregular end face, and the inclination angle of the notch slope matches the inclination angle of the chamfered tip of the irregular end face. Symmetrically arranged receiving portions for the chamfered tips of the irregular end faces are formed along the Y-axis of the upper and lower mold receiving holes. During polishing of the upper or lower irregular end face of the mold, the chamfered tips of the irregular end face are received within the receiving portions of the fixture body. These receiving portions effectively protect the chamfered tips of the irregular end face, preventing wear or deformation during polishing and effectively avoiding damage to the upper or lower mold. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the assembly structure of a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention; Figure 3 for Figure 2 A cross-sectional structural schematic diagram of a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention; Figure 4 for Figure 2 A schematic diagram of the upper or lower mold structure of a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention; Figure 5 for Figure 2 An enlarged structural schematic diagram of part A of a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention; Figure 6 This is a flowchart illustrating the method of using a powder metallurgy mold upper and lower irregular end face polishing fixture according to an embodiment of the present invention. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediary component present. Conversely, when a component is said to be "directly" connected to another component, there is no intermediary component.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, a polishing fixture for the upper and lower irregular end faces of a powder metallurgy mold includes a fixture body 1. The fixture body 1 has an upper and lower mold receiving hole 11 in the vertical direction. A notch 12 is symmetrically formed along the X-axis direction of the upper and lower mold receiving hole 11. The depth of the notch 12 is adapted to the height of the chamfer tip 211 of the irregular end face. The inclination angle of the slope of the notch 12 is adapted to the inclination angle of the slope of the chamfer tip 211 of the irregular end face. A receiving portion 13 of the chamfer tip 211 of the irregular end face is formed symmetrically in the Y-axis direction of the upper and lower mold receiving hole 11. An upper and lower mold fixing hole 14 is formed at a preset position on the side of the fixture body 1. The upper and lower mold fixing hole 14 is connected to the upper and lower mold receiving hole 11.

[0021] like Figure 4 As shown, the upper and lower mold receiving holes 11 are through holes along the vertical direction of the fixture body 1, facilitating the entry or exit of the upper and lower molds that need polishing into or out of the fixture body 1; the depth of the notch 12 is adapted to the height of the chamfered tip 211 of the irregular end face, and the inclination angle of the inclined surface 121 of the notch 12 is adapted to the inclination angle of the inclined surface of the chamfered tip 211 of the irregular end face, facilitating the polishing of the chamfered tip 211 during polishing without obstructing the polishing of the chamfered tip 211; the notch 12 is an inverted trapezoidal structure. The structure is connected to the upper and lower mold receiving holes 11, and the width of the notch 12 is adapted to the width of the irregular end face 21; the receiving part 13 is used to accommodate the chamfered tip 211 during polishing, so as to prevent the chamfered tip 211 from protruding from the fixture during polishing; the upper and lower mold fixing holes 14 are used to fix the upper or lower mold 2 being polished by external fasteners, and the upper and lower mold fixing holes 14 are provided with internal threads, which are threaded to engage with the external threads of the external fasteners, which can be bolts.

[0022] When polishing is required on the irregularly shaped end faces of the upper or lower mold, the upper or lower mold to be polished is inserted into the upper or lower mold receiving hole 11, so that the irregularly shaped end face of the upper or lower mold to be polished first enters the upper or lower mold receiving hole 11. The upper or lower mold to be polished moves along the upper or lower mold receiving hole 11 towards the top of the fixture body 1 until the chamfered tip 211 of the upper or lower mold to be polished is completely received in the receiving part 13. At this time, the upper or lower mold to be polished moves to the polishing position, and the external fastener enters into the fixture body 1 through the upper or lower mold fixing hole 14 until it abuts against the side of the upper or lower mold to be polished, fixing the upper or lower mold to be polished in the fixture body 1 to prevent movement during the polishing process. After the upper or lower mold to be polished is fixed in the fixture body 1, the end face of the upper or lower mold to be polished can be polished.

[0023] Thus, the powder metallurgy mold upper and lower irregular end face polishing fixture has a fixture body 1 with upper and lower mold receiving holes 11 in the vertical direction. Notches 12 are symmetrically formed along the X-axis direction of the upper and lower mold receiving holes 11. The depth of the notches 12 is adapted to the height of the chamfer tip 211 of the irregular end face 21. The inclination angle of the notch slope 121 is adapted to the inclination angle of the slope of the chamfer tip 211 of the irregular end face 21. A symmetrically arranged receiving part 13 for the chamfer tip 211 of the irregular end face 21 is formed in the Y-axis direction of the upper and lower mold receiving holes 11. When polishing the upper or lower irregular end face of the mold, the chamfer tip 211 of the irregular end face 21 is received in the receiving part of the fixture body 1. The receiving part 13 can effectively protect the chamfer tip 211 of the irregular end face 21, avoid wear or deformation of the chamfer tip 211 during the polishing process, and effectively avoid damage to the upper or lower mold.

[0024] like Figure 5 As shown, in one embodiment, the top surface of the fixture body has a limiting component 3. The limiting component 3 includes a rotating component 31 and a baffle 32. One end of the baffle 32 is mounted on the rotating component 31, and the bottom surface of the other end of the baffle 32 is in contact with the top surface of the fixture body 1 and is at least partially located at the top of the receiving portion 13 in the vertical direction. The rotating component 31 can drive the baffle 32 to rotate in a preset direction.

[0025] The baffle 32 is a thin sheet made of a hard material. When polishing is required, the chamfered tip 211 must be housed in the receiving portion 13, with the top surface of the chamfered tip 211 and the top surface of the receiving portion 13 at the same level. Only then is the chamfered tip 211 properly installed, and the upper or lower mold to be polished positioned. However, during the movement of the chamfered tip 211 of the upper or lower mold in the receiving hole 11, adjustments are needed to ensure that the top surface of the chamfered tip 211 and the top surface of the receiving portion 13 are at the same level, which is inefficient. Therefore, the limiting component 3 is used to limit the installation position of the chamfer tip 211. When polishing is required, the rotating component 31 drives the baffle 32 to rotate to a preset position. The bottom surface of the baffle 32 is in contact with the top surface of the fixture body 1 and is at least partially located at the top of the receiving part 13 in the vertical direction. After the chamfer tip 211 of the upper or lower mold to be polished moves from the upper or lower mold receiving hole 11 to the receiving part 13 and comes into contact with the baffle 32, it proves that the chamfer tip 211 has been installed in place. The upper or lower mold to be polished can be fixed without repeatedly adjusting the position of the chamfer tip 211 in the receiving part 13, thus improving the installation efficiency of the upper or lower mold to be polished. After the upper or lower mold to be polished is fixed, the rotating component 31 drives the baffle 32 to rotate by a preset angle, moving the baffle 32 away from the top surface of the chamfer tip 211 to avoid affecting the polishing of the chamfer tip 211.

[0026] In one embodiment, the powder metallurgy mold upper and lower irregular end face polishing fixture further includes a flexible buffer plate 4, which is installed in the inner layer of the accommodating part 13 and is used to wrap the outer layer of the chamfered tip 211 of the irregular end face 21; the flexible buffer plate 4 is made of one or more of silicone, silicone rubber or polyurethane rubber.

[0027] The flexible buffer plate 4 possesses a certain degree of elasticity and plasticity. If the outer layer of the irregular end face 21 has a small irregular structure, it is easy to damage the small irregular structure when the outer layer of the irregular end face 21 is in contact with the inner layer of the receiving part 13. Thus, by setting the flexible buffer plate 4, the small irregular structure can be housed in the flexible buffer plate 4 and wrapped in the flexible buffer plate 4, effectively protecting the small irregular structure and preventing damage.

[0028] In one embodiment, the fixture body 1 has a positioning notch 15 on the side near the notch 12, the positioning notch 15 being used for positioning the fixture when it is installed on the polishing equipment.

[0029] In this way, by setting the positioning notch 15, the fixture can be quickly installed on the polishing equipment, improving the installation efficiency of the fixture.

[0030] In one embodiment, the fixture body 1 is made of carbon fiber or titanium alloy.

[0031] Carbon fiber has only one-quarter the density of steel, but its tensile strength is 7-9 times that of steel, while its elastic modulus is comparable to that of steel. This characteristic allows the fixture body 1 to be significantly lighter while maintaining high rigidity. Carbon fiber has extremely strong resistance to corrosion from chemical media such as acids and alkalis, and can resist the erosion of polishing fluids, coolants, etc., extending the life of the fixture.

[0032] Titanium alloys have a density approximately 57% that of steel, but their strength is comparable to high-strength steel, and they also possess good toughness. This makes the fixture both lightweight and able to withstand dynamic loads (such as vibration and impact) during the polishing process, preventing structural fatigue or deformation due to long-term use.

[0033] like Figure 5 As shown, a method for using a polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold is described. The method includes: S1. Insert the irregular end face of the upper or lower mold to be polished into the fixture body from the bottom of the upper or lower mold receiving hole; S2. The chamfered tip of the irregular end face is accommodated in the accommodating part during the movement of the upper and lower accommodating holes of the mold; S3. The external fasteners abut against the upper or lower mold to be polished through the upper and lower mold fixing holes.

[0034] The options described in the above fixture embodiments also apply to this embodiment, and will not be detailed here.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold, characterized in that: The fixture includes a fixture body, which has upper and lower mold receiving holes in a vertical direction. A notch is symmetrically formed along the X-axis of the upper and lower mold receiving holes. The depth of the notch matches the height of the chamfered tip of the irregular end face. The inclination angle of the notch's slope matches the inclination angle of the chamfered tip of the irregular end face. A symmetrically arranged receiving portion for the chamfered tip of the irregular end face is formed along the Y-axis of the upper and lower mold receiving holes. A mold upper and lower mold fixing hole is formed at a predetermined position on the side of the fixture body, and the mold upper and lower mold fixing hole is connected to the mold upper and lower mold receiving holes. The top surface of the fixture body has a limiting component, which includes a rotating member and a baffle. One end of the baffle is mounted on the rotating member, and the bottom surface of the other end of the baffle is in contact with the top surface of the fixture body and is at least partially located at the top of the receiving part in the vertical direction. The rotating member can drive the baffle to rotate in a preset direction.

2. The powder metallurgy mold upper and lower irregular end face polishing fixture according to claim 1, characterized in that: The notch is an inverted trapezoidal structure and is connected to the upper and lower accommodating holes of the mold.

3. A polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold according to claim 1, characterized in that: The powder metallurgy mold upper and lower irregular end face polishing fixture also includes a flexible buffer plate, which is installed in the inner layer of the accommodating part and is used to wrap the outer layer of the chamfered tip of the irregular end face.

4. A powder metallurgy mold upper and lower irregular end face polishing fixture according to claim 3, characterized in that: The flexible buffer plate is made of one or more of silicone rubber, silicone rubber, or polyurethane rubber.

5. A polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold according to claim 1, characterized in that: The fixture body has a positioning notch on the side near the notch, which is used for positioning the fixture when it is installed on the polishing equipment.

6. A powder metallurgy mold upper and lower irregular end face polishing fixture according to claim 1, characterized in that: The width of the notch is adapted to the width of the irregular end face.

7. A powder metallurgy mold upper and lower irregular end face polishing fixture according to claim 1, characterized in that: The fixture body is made of carbon fiber or titanium alloy.

8. A method for using a polishing fixture for the upper and lower irregularly shaped end faces of a powder metallurgy mold, characterized in that... The method of using the powder metallurgy mold upper and lower irregular end face polishing fixture as described in any one of claims 1 to 7 includes: Insert the irregular end face of the upper or lower mold to be polished into the fixture body from the bottom of the upper or lower mold receiving hole; The chamfered tip of the irregular end face is accommodated in the receiving part during the movement of the upper and lower mold receiving holes; The external fasteners abut against the upper or lower mold to be polished through the upper and lower mold fixing holes.

9. The method of using the powder metallurgy mold upper and lower irregular end face polishing fixture as described in claim 8, characterized in that, The upper and lower fixing holes of the mold are provided with internal threads, which are threaded to engage with the external threads of the external fixing parts.

Images