A stackable device and method for vacuum processing of uniform temperature fields

Abstract

A stackable device and method for achieving a uniform temperature field in vacuum treatment are disclosed, belonging to the technical field of powder metallurgy heat treatment equipment. This invention solves the problem of uneven heating of workpieces during vacuum heat treatment furnaces, which affects heat treatment quality. The invention includes a top cover and trays. The bottom of the top cover has a stepped stop, and the upper end of the tray has a stepped protruding stop. The stepped stop on the top cover mates with the stepped protruding stop on the tray. The lower end of the tray has a stepped concave stop, which mates with the stepped protruding stop on the upper end of the next tray section. The workpiece is placed inside the tray, and multiple threaded holes are machined on the side wall of the tray. Positioning pins pass through these holes to fix the workpiece inside the tray. This stackable device allows for uniform heating of the workpiece during heat treatment in a vacuum furnace, improving the heat treatment quality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat treatment powder metallurgy devices, in particular to a stackable device for uniform temperature field of vacuum treatment and a use method. BACKGROUND

[0002] With the development of high-end equipment manufacturing demand and engineering material technology, the requirement for heat treatment process is also increasing. For materials prone to oxidation in high-temperature environment, vacuum heat treatment furnace is needed for heating. However, in vacuum environment, there is no heat conduction medium, and the heating pieces in the furnace can only transfer heat to the workpiece by heat radiation. In order to consider the negative pressure bearing strength of the inner cavity, the furnace is generally designed as a horizontal barrel-shaped structure. Therefore, the workpiece in the furnace will be unevenly heated due to the different distances between the placement position and the surrounding heating pieces, thereby affecting the heat treatment quality.

[0003] Therefore, the application provides a stackable device for uniform temperature field of vacuum furnace heat treatment and a use method to solve the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problem of uneven heating of workpieces in a vacuum heat treatment furnace, which affects the quality of heat treatment. In the following, a brief summary of the present application is given to provide a basic understanding of some aspects of the present application. It should be understood that this summary is not an exhaustive summary of the present application. It is not intended to determine the key or important parts of the present application, nor to limit the scope of the present application.

[0005] The technical scheme of the present application is as follows:

[0006] Scheme one: a stackable device for uniform temperature field of vacuum furnace treatment, comprising a top cover and a drawer tray, the bottom of the top cover is processed with a stepped stop, the upper end of the drawer tray is processed with a stepped convex stop, the stepped stop on the top cover is connected with the stepped convex stop on the drawer tray, the lower end of the drawer tray is processed with a stepped recessed stop, the stepped recessed stop on the lower end of the drawer tray is connected with the stepped convex stop on the upper end of the next drawer tray, the workpiece is arranged in the drawer tray, a plurality of threaded holes are processed on the side wall of the drawer tray, and the positioning pin is fixed in the drawer tray through the threaded hole.

[0007] Further, the positioning pin is a cylindrical taper head threaded positioning pin.

[0008] Further, the top cover and the drawer tray are made of graphite material.

[0009] Scheme two: a method for using the stackable device for uniform temperature field in vacuum furnace treatment, which is realized by the stackable device for uniform temperature field in vacuum furnace treatment according to scheme one, characterized in that, comprising the following steps:

[0010] Step one: processing the drawer tray and the top cover according to the structure and size of the workpiece to be heat treated;

[0011] Step two: placing the workpiece needing vacuum heat treatment into the drawer tray, using the positioning pin to uniformly apply the jacking force from the four sides of the drawer tray, so that the workpiece is suspended in the drawer tray, and the number of the drawer trays is determined according to the number of the workpieces, and one workpiece is placed in each drawer tray;

[0012] Step three: covering the top cover after the uppermost drawer tray, and then sending the whole into the furnace, so that each workpiece is subjected to uniform heat radiation in the vacuum heat treatment furnace.

[0013] The present application has the following beneficial effects:

[0014] 1. The stackable device for uniform temperature field in vacuum furnace treatment provides a full cladding structure, so that the workpiece subjected to heat treatment in the vacuum furnace can be uniformly heated, the heat treatment quality of the workpiece is improved, and deformation of the workpiece due to uneven heating is avoided, thereby improving the heat treatment qualification rate.

[0015] 2. The positioning pin of the stackable device for uniform temperature field in vacuum furnace treatment can suspend the workpiece in the drawer tray, maximally reducing direct contact with the device itself, so that the workpiece is subjected to more uniform heat radiation, and the upper and lower butt joints of the drawer tray are more convenient for continuous stacking according to the number of the workpieces and the size of the furnace, the structure is compact, the occupied space is small, and complete and uniform cladding is formed for each workpiece, which can effectively guarantee that the workpiece receives uniform heat radiation in the vacuum environment, and the device is also suitable for suspension clamping of various forms of workpieces such as plates and shafts. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the stackable device for uniform temperature field in vacuum furnace treatment;

[0017] Figure 2 It is a structure schematic view of the top cover;

[0018] Figure 3 It is a structure schematic view of the drawer tray;

[0019] Figure 4 It is a structure schematic view of the bottom of the drawer tray;

[0020] Figure 5 It is the cooperation relationship between the two drawer trays and the top cover.

[0021] In the figure: 1 - top cover, 2 - drawer tray, 3 - stepped stop, 4 - stepped protruding stop, 5 - stepped recessed stop, 6 - positioning pin, 7 - workpiece. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0023] The connection mentioned in the present application is divided into fixed connection and detachable connection. The fixed connection (i.e. non-detachable connection) includes but is not limited to conventional fixed connection modes such as flange connection, rivet connection, adhesive connection and welding connection, and the detachable connection includes but is not limited to conventional detachable modes such as threaded connection, buckle connection, pin connection and hinge connection. When the specific connection mode is not explicitly limited, at least one connection mode can be found in the existing connection mode to achieve the function, and the person skilled in the art can select it according to the needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.

[0024] In the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or it can be detachable connection, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Example 1, in combination Figures 1-5 This embodiment is a stackable device for uniform temperature field in vacuum furnace treatment, which comprises a top cover 1 and a drawer tray 2. The bottom of the top cover 1 is processed with a stepped stop 3, the upper end of the drawer tray 2 is processed with a stepped protruding stop 4, the stepped stop 3 on the top cover 1 is connected with the stepped protruding stop 4 on the drawer tray 2, the lower end of the drawer tray 2 is processed with a stepped recessed stop 5, the stepped recessed stop 5 at the lower end of the drawer tray 2 is connected with the stepped protruding stop 4 at the upper end of the next drawer tray 2, the workpiece 7 is arranged in the drawer tray 2, a plurality of threaded holes are processed on the side wall of the drawer tray 2, and the positioning pin 6 passes through the threaded hole to fix the workpiece 7 in the drawer tray 2.

[0026] The stackable device specifically comprises a top cover 1 and a plurality of drawer plates 2, the number of the drawer plates 2 depends on the number of workpieces 7, one workpiece 7 is placed in each drawer plate 2, the thickness of the top cover 1 is consistent with the thickness of the drawer plates 2, and the bottom of the top cover 1 has a stepped stop 3 which can be matched with a stepped protruding stop 4 on the drawer plate 2 connected therewith, so that the cover can be easily closed and stable without shaking. The upper end of the drawer plate 2 has a stepped protruding stop 4, and the lower end has a stepped recessed stop 5 which is matched with the upper end stepped protruding stop 4 of the next lower drawer plate 2 connected therewith, and threaded holes are arranged around the drawer plate 2, a positioning pin 6 is screwed into the threaded hole to apply a certain pre-tightening force to the periphery of the workpiece 7, and the positioning pin 6 is a cylindrical tapered head threaded positioning pin, and the head is an R2 ball head, which can ensure the pre-tightening force and also will not hurt the workpiece.

[0027] The materials of the top cover 1 and the drawer plates 2 are graphite materials which are resistant to high temperature, can conduct heat and have good machining properties, and the positioning pin 6 is made of stainless steel.

[0028] Embodiment 2, in combination Figures 1-5 The embodiment illustrates a use method of a stackable device for uniform temperature field treatment in a vacuum furnace, which comprises the following steps:

[0029] Step one: processing the drawer plates 2 and the top cover 1 according to the structure and size of the workpieces 7 to be heat treated;

[0030] Step two: placing the workpieces 7 to be vacuum heat treated into the drawer plates 2, applying a pre-tightening force from the periphery of the drawer plates 2 by using the positioning pins 6 to make the workpieces 7 suspended in the drawer plates 2, determining the number of the drawer plates 2 according to the number of the workpieces 7, and placing one workpiece 7 in each drawer plate 2;

[0031] Step three: covering the uppermost drawer plate 2 with the top cover 1, and then sending the whole into the furnace, so that each workpiece 7 is subjected to uniform heat radiation in the vacuum heat treatment furnace.

[0032] This embodiment is only an illustrative description of the present application and does not limit the protection scope thereof, and a person skilled in the art can also make changes to it locally, as long as it does not exceed the spirit and essence of the present application, and is within the protection scope of the present application.

Claims

1. A stackable device for uniform temperature field in vacuum processing, characterized by: The utility model relates to a graphite material vacuum heat treatment device, which comprises a top cover (1) and a drawer plate (2), the bottom of the top cover (1) is provided with a stepped stop (3), the upper end of the drawer plate (2) is provided with a stepped convex stop (4), the stepped stop (3) on the top cover (1) is connected with the stepped convex stop (4) on the drawer plate (2), the lower end of the drawer plate (2) is provided with a stepped concave stop (5), the stepped concave stop (5) on the lower end of the drawer plate (2) is connected with the stepped convex stop (4) on the upper end of the next drawer plate (2), a workpiece (7) is arranged in the drawer plate (2), a plurality of threaded holes are formed around the drawer plate (2), a positioning pin (6) passes through the threaded hole to fix the workpiece (7) in the drawer plate (2), and the positioning pin (6) is a cylindrical taper head threaded positioning pin.

2. A stackable device for uniform temperature field in vacuum processing according to claim 1, characterized in that: The top cover (1) and the drawer plate (2) are both made of graphite material.

3. A method of using a stackable device for a uniform temperature field in vacuum processing, which is implemented in connection with a stackable device for a uniform temperature field in vacuum processing as claimed in claim 2, characterized by The utility model relates to a graphite material vacuum heat treatment device, which comprises the following steps: Step one: according to the structure and size of the workpiece (7) to be heat treated, the drawer plate (2) and the top cover (1) are processed; Step two: the workpiece (7) needing vacuum heat treatment is placed in the drawer plate (2), the positioning pin (6) is used to uniformly apply jacking force from the periphery of the drawer plate (2), so that the workpiece (7) is suspended in the drawer plate (2), the number of the drawer plate (2) is determined according to the number of the workpiece (7), and one workpiece (7) is placed in each drawer plate (2); Step three: after the uppermost drawer plate (2) is covered with the top cover (1), the whole is sent into a furnace, and each workpiece (7) is subjected to uniform heat radiation in a vacuum heat treatment furnace.

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