Middle mold heating device of powder metallurgy warm pressing technology

Abstract

The utility model discloses a middle mold heating device of a powder metallurgy warm-pressing technology, which comprises an outer cover and an inner cover which are matched with each other to form a flow channel for oil to flow, and an oil inlet channel communicated with the starting end of the flow channel and an oil outlet channel communicated with the tail end of the flow channel are arranged in the outer cover. An oil inlet communicated with the oil inlet channel and an oil outlet communicated with the oil outlet channel are formed in the non-matching surface of the outer cover; according to the middle mold heating device, the temperature of the middle mold is increased in a heat conduction mode, the temperature of metal powder during compaction can be correspondingly increased, the binding force between metal powder particles is increased, and therefore the density of a blank is increased, and the mechanical performance of a product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy molds, in particular to a middle die heating device for powder metallurgy warm compaction technology. Background Art

[0002] Powder metallurgy is a process technology for producing metal powders or using metal powders as raw materials, and manufacturing metal materials, composite materials and various types of products through forming and sintering.

[0003] The existing pressing die includes a forming upper punch, a forming middle die, a forming lower punch and a middle die heating device; during powder metallurgy pressing, first fill the mold cavity of the pressing die with metal powder, and then apply force through a pressure mechanism to close the pressing die. After closing the die, the metal powder in the mold cavity is compacted and formed. After opening the die, the blank is ejected, and the blank is sintered to complete the workpiece; since the mechanical properties of the workpiece are related to the compactness of the metal powder, the higher the compactness, the better the mechanical properties of the workpiece. However, in the prior art, generally at room temperature, only relying on the pressure generated when the pressing die is closed to compact the metal powder, the binding force of the metal powder particles is low, it is difficult to improve the density of the blank, which affects the mechanical properties of the product and reduces the product quality. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a middle die heating device for powder metallurgy warm compaction technology, which can heat the middle die, correspondingly increase the temperature of the metal powder during compaction, thereby increasing the density of the blank and being beneficial to improving the product quality.

[0005] The purpose of the utility model is realized through the following technical solutions:

[0006] A middle die heating device for powder metallurgy warm compaction technology includes an outer cover and an inner cover that can form a flow channel for circulating oil after being cooperated with each other. An oil inlet channel communicating with the starting end of the flow channel is arranged inside the outer cover, and an oil outlet channel communicating with the ending end of the flow channel is arranged. An oil inlet communicating with the oil inlet channel and an oil outlet communicating with the oil outlet channel are arranged on the non-mating surface of the outer cover.

[0007] Based on the above technical solutions, the utility model can be improved as follows:

[0008] Furthermore, a mating cavity that can be correspondingly mated with the inner cover is formed inside the outer cover. The mating cavity is provided with a mating surface on the inner side that can be attached to the outer wall of the inner cover during mating; a flow channel groove that can be closed by the outer wall of the inner cover to form the flow channel is arranged on the mating surface; the oil inlet channel and the oil outlet channel are located on both sides of the mating cavity and are respectively communicated with both ends of the flow channel groove.

[0009] Further, the starting end of the flow channel groove is close to the top of the fitting cavity and communicates with the oil inlet channel, and the ending end of the flow channel groove is close to the bottom of the fitting cavity and communicates with the oil outlet channel. The flow channel groove spirally extends along the fitting surface of the fitting cavity from the starting end to the ending end.

[0010] Further, the oil inlet and the oil outlet are arranged on the top surface of the outer cover; one end of the oil inlet channel communicates with the oil inlet, and the other end extends inside the outer cover and communicates with the starting end of the flow channel groove to guide the oil to enter according to a preset trajectory; one end of the oil outlet channel communicates with the oil outlet, and the other end extends inside the outer cover and communicates with the ending end of the flow channel groove to guide the oil to flow out according to a preset trajectory.

[0011] Further, both the preset oil inlet trajectory formed by the oil inlet channel and the preset oil outlet trajectory formed by the oil outlet channel are in an L shape.

[0012] Further, a stepped portion is provided in the fitting cavity of the outer cover, and the inner cover is formed with a fitting section that can be correspondingly fitted with the stepped portion, and a sealing ring is provided between the stepped portion of the fitting cavity and the fitting section of the inner cover.

[0013] Further, quick connectors are provided at the oil inlet and the oil outlet of the outer cover.

[0014] Compared with the prior art, the technical solution of the present utility model has the following advantages:

[0015] The present utility model is provided with an outer cover and an inner cover. After the outer cover and the inner cover are mutually fitted, a flow channel can be formed, and an oil inlet channel and an oil outlet channel are arranged inside the outer cover; the high-temperature oil heated by an external oil heating device enters the inside of the outer cover through the oil inlet, and flows into the flow channel along the preset oil inlet trajectory under the guidance of the oil inlet channel. The oil flows in the flow channel to heat the middle die heating device. The oil flows along the preset oil outlet trajectory under the guidance of the oil outlet channel and flows out of the outer cover from the oil outlet. The middle die heating device raises the temperature of the middle die by heat conduction, which can correspondingly increase the temperature of the metal powder during compaction, increase the bonding force between metal powder particles, thereby improving the density of the blank and enhancing the mechanical properties of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0017] Figure 1 It is an assembly drawing of the middle die heating device for the powder metallurgy warm compaction technology of the utility model;

[0018] Figure 2 It is a schematic structural diagram of the outer cover of the utility model;

[0019] Figure 3Schematic diagram of the internal cover structure of the utility model;

[0020] Figure 4 Schematic diagram of the structure of the middle die heating device of the powder metallurgy warm compaction technology of the utility model.

[0021] Marks on the attached drawings: 1 - outer cover, 101 - first step part, 102 - second step part, 103 - oil inlet, 104 - oil outlet, 2 - inner cover, 201 - top mating section, 202 - middle mating section, 203 - bottom mating section, 3 - oil inlet channel, 4 - oil outlet channel, 5 - flow channel groove, 6 - first sealing ring, 7 - second sealing ring. Specific embodiments

[0022] The following further describes the specific embodiments of the present utility model with reference to the attached drawings. The description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the following various embodiments of the present utility model can be combined with each other as long as they do not conflict with each other.

[0023] See Figures 1 to 4 , the present utility model relates to a middle die heating device for powder metallurgy warm compaction technology, including an outer cover 1 and an inner cover 2 that cooperate with each other. The outer cover 1 is provided with a mating cavity that can correspond to and cooperate with the inner cover 2, and an oil inlet channel 3 and an oil outlet channel 4 located on both sides of the mating cavity. A flow channel groove 5 is provided inside the mating cavity. The oil inlet channel 3 extends inside the outer cover 1 and communicates with one end of the flow channel groove 5, and the oil outlet channel 4 extends inside the outer cover 1 and communicates with the other end of the flow channel groove 5.

[0024] After the outer cover 1 and the inner cover 2 are mutually cooperated, they are fastened by bolts. Corresponding bolt holes are provided at the bottoms of the outer cover 1 and the inner cover 2. When the outer cover 1 and the inner cover 2 are mutually cooperated, the outer wall of the inner cover 2 fits against the inner side of the mating cavity of the outer cover 1, and the flow channel groove 5 on the mating cavity of the outer cover 1 can be closed to form a flow channel. At this time, the inner wall of the mating cavity of the outer cover 1 is the mating surface. High-temperature oil enters this flow channel through the oil inlet channel 3 according to a preset oil inlet trajectory, flows along the flow channel to heat the middle die heating device, and after heating, flows out of the outer cover 1 through the oil outlet channel 4 according to a preset oil outlet trajectory and returns to an external oil heating device for reheating and cyclic transportation. The middle die heating device raises the temperature of the middle die by heat conduction to complete powder metallurgy pressing.

[0025] It should be noted that in this embodiment, the temperature of the oil flowing into the internal flow channel of the middle die heating device is 150°C. According to actual processing needs, the temperature of this oil can also be adjusted accordingly by an external oil heating device. The oil heating device is a liquid heating machine in the prior art.

[0026] Specifically, the outer cover 1 is a circular plate body. The outer cover 1 is provided with a stepped mating cavity in the middle. The mating cavity forms a top mating port on the top surface of the outer cover 1 and a bottom mating port on the bottom surface of the outer cover 1 respectively. The mating cavity forms a first stepped portion 101 near the top mating port, and a second stepped portion 102 near the bottom mating port. A flow channel groove 5 is provided on the cavity wall between the first stepped portion 101 and the second stepped portion 102 of the mating cavity. The inner cover 2 is a circular plate body in a stepped shape, and a pressing cavity that can cooperate with the middle mold is formed inside. The inner cover 2 includes a top mating section 201, a middle mating section 202, and a bottom mating section 203 arranged in sequence along the axis. The top mating section 201 is located at the top of the inner cover 2, and the bottom mating section 203 is located at the bottom of the inner cover 2. For middle molds of different specifications, only the inner cover 2 with a corresponding pressing cavity needs to be replaced, without the need to replace the middle mold heating device as a whole, which improves the applicability of the middle mold heating device and reduces production costs.

[0027] During assembly, the top mating section 201 of the inner cover 2 mates with the first stepped portion 101 of the mating cavity of the outer cover 1, the bottom mating section 203 of the inner cover 2 mates with the second stepped portion 102 of the mating cavity of the outer cover 1, and the outer wall of the middle mating section 202 of the inner cover 2 closes the flow channel groove 5 on the mating cavity of the outer cover 1 to form a flow channel. The two ends of the flow channel are respectively communicated with the oil inlet channel 3 and the oil outlet channel 4. An oil inlet 103 and an oil outlet 104 are provided on the non-mating surface of the outer cover 1. The oil inlet 103 is communicated with the oil inlet channel 3, and the oil outlet 104 is communicated with the oil outlet channel 4, so as to form an oil flow path for high-temperature oil to flow and conduct heat inside the middle mold heating device.

[0028] In this embodiment, the flow channel groove 5 on the mating cavity of the outer cover 1 is spiral. Specifically, the starting end of the flow channel groove 5 is close to the top mating port of the mating cavity of the outer cover 1 and is communicated with the oil inlet channel 3. The end of the flow channel groove 5 is close to the bottom mating port of the mating cavity of the outer cover 1 and is communicated with the oil outlet channel 4. The flow channel groove 5 spirally extends along the cavity wall of the mating cavity of the outer cover 1 from the starting end to the end. The spiral flow channel groove 5 can increase the length of the oil flow path, and the heat absorption area is correspondingly increased, so as to improve the heating efficiency of the middle mold heating device and improve the product pressing quality.

[0029] The oil inlet channel 3 is used to preset the oil inlet trajectory, and the oil outlet channel 4 is used to preset the oil outlet trajectory. In this embodiment, both the oil inlet channel 3 and the oil outlet channel 4 are in an L shape and are composed of two successive oil travel sections to change the oil inflow and outflow directions.

[0030] Specifically, the starting section of the oil inlet passage 3 is arranged vertically, parallel to the axis of the mating cavity of the outer cover 1, and the top forms an oil inlet 103 on the top surface of the outer cover 1, so that the oil can enter the oil inlet passage 3 from the oil inlet 103 to complete the first-stage oil inlet stroke; the end section of the oil inlet passage 3 is arranged horizontally, parallel to the radial direction of the mating cavity of the outer cover 1, and is communicated with the starting end of the flow channel groove 5; the starting section and the end section of the oil inlet passage 3 are perpendicular to each other, so that after the oil changes direction through the second-stage oil inlet stroke, it enters the flow channel groove 5 radially; compared with the direct oil inlet method, the axial-first and then-radial oil inlet method adopted in this embodiment can change the oil inflow direction to reduce the oil flow rate, avoid the large accumulation and backflow caused by the oil flow rate exceeding the rated oil passing amount of the oil inlet 103, and thus complete the stable oil inlet.

[0031] The starting section of the oil outlet passage 4 is arranged horizontally, parallel to the radial direction of the mating cavity of the outer cover 1, and is communicated with the end of the flow channel groove 5, so that the oil can enter the oil outlet passage 4 from the end section of the flow channel groove 5 to complete the first-stage oil outlet stroke; the end section of the oil outlet passage 4 is arranged vertically, parallel to the axis of the mating cavity of the outer cover 1, and the top forms an oil outlet 104 on the top surface of the outer cover 1, so that the oil can be discharged from the oil outlet 104 to complete the second-stage oil outlet stroke; the starting section and the end section of the oil outlet passage 4 are perpendicular to each other. Since the flow channel groove 5 is spiral, the oil flow rate is accelerated after passing through the flow channel groove 5. The accelerated oil can change the oil outlet direction and reduce the oil flow rate through the radial-first and then-axial oil outlet method, avoid the large accumulation and backflow caused by the oil exceeding the rated oil passing amount of the oil outlet 104, and thus complete the stable oil outlet.

[0032] It should be noted that the number of spiral turns of the flow channel groove 5 on the mating cavity of the outer cover 1 in this embodiment is three turns. According to the actual situation, the number of spiral turns of the flow channel groove 5 can be increased or decreased accordingly; since both the oil inlet 103 and the oil outlet 104 are arranged on the top surface of the outer cover 1, the mold occupation area can be reduced; at the same time, quick connectors are provided at the oil inlet 103 and the oil outlet 104 of the outer cover 1 to facilitate connection with an external oil heating device through pipes to form an oil circulation loop; the quick connectors are pipe quick connectors in the prior art.

[0033] A first sealing ring 6 is arranged between the top mating section 201 of the inner cover 2 and the first step portion 101 of the mating cavity of the outer cover 1, and a second sealing ring 7 is arranged between the bottom mating section 203 of the inner cover 2 and the second step portion 102 of the mating cavity of the outer cover 1. The two sealing rings can prevent the oil from leaking out from the gap between the outer cover 1 and the inner cover 2; the two sealing rings are rubber sealing rings in the prior art.

[0034] The above embodiments of the present utility model do not limit the protection scope of the present utility model. The implementation manners of the present utility model are not limited thereto. All such modifications, substitutions or alterations of various other forms made to the above structure of the present utility model according to the above content of the present utility model, in accordance with the common general technical knowledge and customary means in the art, without departing from the above basic technical idea of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A middle die heating device for powder metallurgy warm pressing technology, characterized in that: It comprises an outer cover and an inner cover which can form a flow channel for circulating oil after matching with each other, wherein the outer cover is provided with an oil inlet channel connected to the starting end of the flow channel, and an oil outlet channel connected to the tail end of the flow channel; and the non-matching surface of the outer cover is provided with an oil inlet port connected to the oil inlet channel, and an oil outlet port connected to the oil outlet channel.

2. The middle die heating device of powder metallurgy warm pressing technology according to claim 1 is characterized in that: A mating cavity which can be matched with the inner cover is formed inside the outer cover, and a mating surface which can be fitted together with the outer wall of the inner cover when mating is provided on the inner side of the mating cavity; a flow channel groove which can be closed by the outer wall of the inner cover to form the flow channel is provided on the mating surface; the oil inlet channel and the oil outlet channel are located on both sides of the mating cavity, and are respectively connected to the two ends of the flow channel groove.

3. The middle die heating device of the powder metallurgy warm pressing technology according to claim 2 is characterized in that: The starting end of the flow channel groove is close to the top of the matching cavity and is connected to the oil inlet channel, the ending end of the flow channel groove is close to the bottom of the matching cavity and is connected to the oil outlet channel, and the flow channel groove extends spirally along the matching surface of the matching cavity from the starting end to the ending end.

4. The middle die heating device of the powder metallurgy warm pressing technology according to claim 2 is characterized in that: The oil inlet and the oil outlet are arranged on the top surface of the outer cover; one end of the oil inlet channel is connected with the oil inlet, and the other end extends inside the outer cover and is connected with the starting end of the flow channel groove to guide the oil to enter along a preset trajectory; one end of the oil outlet channel is connected with the oil outlet, and the other end extends inside the outer cover and is connected with the tail end of the flow channel groove to guide the oil to exit along a preset trajectory.

5. The middle die heating device of powder metallurgy warm pressing technology according to claim 4 is characterized in that: The preset oil inlet track formed by the oil inlet channel and the preset oil outlet track formed by the oil outlet channel are both L-shaped.

6. The middle die heating device of the powder metallurgy warm pressing technology according to any one of claims 1 to 5, characterized in that: The matching cavity of the outer cover is provided with a step portion, the inner cover is formed with a matching section that can be matched with the step portion, and a sealing ring is provided between the step portion of the matching cavity and the matching section of the inner cover.

7. The middle die heating device of the powder metallurgy warm pressing technology according to any one of claims 1 to 5, characterized in that: Quick-release connectors are provided at the oil inlet and the oil outlet of the outer cover.

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