Bearing steel heat treatment lifting appliance

Abstract

The utility model provides a bearing class steel piece heat treatment lifting appliance belongs to mechanical processing field, the utility model discloses the middle shaft of hanger and hangs the axle, and the hanger's middle shaft is made threaded through -hole, and both sides are connected with the lug to be hoisted in the heat treatment furnace, and the hanging axle is the stepped axle, and its appearance is designed according to bearing inner hole, and is used for bearing the bearing, and the upper end of hanging axle is made threaded, and is matched with the threaded through -hole of hanger to realize the connection, makes the bearing utilize self -gravity to keep the axial vertical state all the time, avoids the heat treatment deformation of bearing class steel piece, and the product qualified rate is high.

Description

Technical Field

[0001] This utility model belongs to the field of machining and relates to a heat treatment lifting tool for bearing steel parts. Background Technology

[0002] Aircraft engine bearings, such as Figure 3 As shown, the overall shape is cylindrical with an internal stepped through-hole, and a beveled surface at the connection between the large and small diameter sections. Currently, aircraft engine bearings are machined from steel and then heat-treated to increase hardness. The bearings require high dimensional accuracy; if the deformation exceeds 2µm after heat treatment, the bearing is unusable. Furthermore, the bearings are relatively long, with a high-precision stepped inner diameter and an angle of 30°–45° at the step connection. The conventional basket binding method currently used in production presents the following problems:

[0003] (1) Using a basket to bind the bearing will cause stress during the heat treatment process, resulting in large deformation. Due to the high dimensional accuracy requirements of bearings, deformation cannot be repaired, leading to a low success rate of heat treatment for bearing steel parts.

[0004] (2) Due to the lack of effective lifting equipment for bearing steel parts, the bearings are long and heavy, making it time-consuming and labor-intensive for workers to operate, resulting in low production efficiency. Utility Model Content

[0005] This utility model provides a heat treatment lifting tool for bearing steel parts, which enables stable bearing hoisting, prevents any stress during the heat treatment process, avoids irreparable deformation of the bearing caused by stress, ensures product quality, and the lifting tool is simple to use and has high production efficiency.

[0006] The technical solution of this utility model:

[0007] A heat treatment hanger for bearing-type steel parts includes a hanger and a hanger shaft.

[0008] The bracket includes a central shaft and hanging ears. The central shaft is a column with threaded through holes. Two hanging ears are symmetrically fixed on both sides of the column. The hanging ears are trapezoidal with oblong holes at their ends, through which they are suspended in the heat treatment furnace.

[0009] The aforementioned hanging shaft is a stepped shaft, with a small-diameter section at the top and a large-diameter section at the bottom. The junction of the two sections is treated with a chamfered angle of 45°. The main body of the small-diameter section is a smooth rod with an external thread at its upper end, which mates with the threaded through hole of the hanging bracket's central shaft to achieve a threaded connection and fixation. The length of the external thread of the small-diameter section is greater than the length of the threaded through hole of the hanging bracket's central shaft. The outer diameter of the small-diameter section is smaller than the inner diameter of the small-diameter section of the bearing's inner hole, and the length of its smooth rod portion is greater than the length of the small-diameter section of the bearing's inner hole. The outer diameter of the large-diameter section of the hanging shaft is greater than the inner diameter of the small-diameter section of the bearing's inner hole but smaller than the inner diameter of the large-diameter section of the bearing's inner hole. In use, the small-diameter section of the hanging shaft is inserted into the large-diameter section of the bearing's inner hole, and the chamfer of the hanging shaft is used to support the connection between the large and small-diameter sections of the bearing's inner hole.

[0010] Furthermore, the bracket is made of stainless steel.

[0011] Furthermore, the hanging shaft is made of stainless steel.

[0012] The beneficial effects of this utility model are:

[0013] ① By using the 45° guide angle bearing at the inner connection of the hanging shaft, the bearing can be effectively hoisted and fixed, and the bearing can be kept axially vertical by its own weight during the heat treatment process.

[0014] ②Because the entire assembly is vertically suspended, any stress contact with the bearing during the heat treatment process is avoided, effectively preventing deformation of bearing steel parts during heat treatment, resulting in a high product qualification rate.

[0015] ③ The hanger and the hanger shaft are connected by rotating the threaded hole, which is simple to operate, saves workers' operating time, and effectively improves production efficiency.

[0016] ④ The 45° guide angle bearing at the inner connection of the hanging shaft can meet the 30°~45° bearing hoisting requirements at the stepped hole connection. The upper connection end of the hanging shaft is relatively long, which can meet the installation of bearings of various lengths. It has a wide range of applications and realizes the universality of the lifting tool, effectively reducing the cost waste caused by designing lifting tools for different sizes and specifications. Attached Figure Description

[0017] Figure 1 This is an overall drawing of the present utility model.

[0018] Figure 2 This is a diagram of the hanging bracket structure.

[0019] Figure 3 This is a schematic diagram of a bearing.

[0020] Figure 4 This is a diagram of the hanging shaft structure.

[0021] Figure 5 For illustration purposes only.

[0022] In the picture: 1. Hanger; 2. Hanging shaft; 3. Central shaft; 4. Hanging lug. Detailed Implementation

[0023] The specific embodiments of this utility model are further described below with reference to the accompanying drawings and technical solutions.

[0024] Example

[0025] A type of heat treatment lifting tool for bearing-type steel parts, see Figure 1 It includes bracket 1 and bracket 2, both of which are made of stainless steel.

[0026] The aforementioned bracket 1 includes a central shaft 3 and hanging lugs 4. The central shaft 3 is a column with threaded through holes. Two hanging lugs 4 are symmetrically welded to both sides of the column. The hanging lugs 4 are trapezoidal in shape, with oblong holes at their ends, through which they are suspended in the heat treatment furnace. Figure 2 .

[0027] The aforementioned bracket 2 is a stepped shaft integral component, with a small-diameter section at the top and a large-diameter section at the bottom. The junction of the two sections is treated with a chamfered angle of 45°. The main body of the small-diameter section is a smooth rod with an external thread at its upper end, which mates with the threaded through hole of the central shaft 3 of the bracket 1 to achieve threaded connection and fixation. The length of the external thread of the small-diameter section is greater than the length of the threaded through hole of the central shaft 3 of the bracket 1. The outer diameter of the small-diameter section is smaller than the inner diameter of the small-diameter section of the bearing inner hole, and the length of its smooth rod portion is greater than the length of the small-diameter section of the bearing inner hole. The outer diameter of the large-diameter section of the bracket 2 is greater than the inner diameter of the small-diameter section of the bearing inner hole but smaller than the inner diameter of the large-diameter section of the bearing inner hole. See [link to details]. Figure 4 .

[0028] In use, first insert the smaller diameter section of bracket 2 through the larger diameter section of the bearing's inner bore. Use the chamfer of bracket 2 to support the connection between the larger and smaller diameter sections of the bearing's inner bore. Then, connect the upper end of the smaller diameter section of bracket 2 to the threaded through hole of the central shaft 3 of bracket 1 via a thread, and tighten bracket 2. Use a crane to vertically hoist the bearing into the heat treatment furnace through the elongated holes of the lugs 4 on both sides for heat treatment. See [link to relevant documentation]. Figure 5 .

[0029] The above-described embodiments are merely illustrative of the implementation of this utility model, but should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A heat treatment lifting tool for bearing-type steel parts, characterized in that, It includes a hanger (1) and a hanging shaft (2), which are threaded together. The hanger (1) is suspended inside the heat treatment furnace, and the hanging shaft (2) connected below it is designed according to the inner hole of the bearing to support the bearing and make the bearing always keep its axial vertical by its own weight.

2. The heat treatment lifting tool for bearing-type steel parts according to claim 1, characterized in that, The bracket (1) includes a central shaft (3) and hanging ears (4). The central shaft (3) is a column with threaded through holes. Two hanging ears (4) are symmetrically fixed on both sides of the column. Holes are made at the ends and the column is suspended in the heat treatment furnace through the holes.

3. The heat treatment lifting tool for bearing-type steel parts according to claim 2, characterized in that, The aforementioned ear loop (4) is trapezoidal.

4. A heat treatment lifting tool for bearing-type steel parts according to claim 2, characterized in that, The hole at the end of the ear (4) is an oblong hole.

5. A heat treatment lifting tool for bearing-type steel parts according to any one of claims 1-4, characterized in that, The hanging bracket (1) is made of stainless steel.

6. A heat treatment lifting tool for bearing-type steel parts according to claim 1, characterized in that, The hanging shaft (2) is a stepped shaft with a small diameter section at the top and a large diameter section at the bottom. The two sections are joined by a chamfer. The main body of the small diameter section is a smooth rod with an external thread at the top. It is threaded to connect and fix with the threaded through hole of the central shaft (3) of the hanging bracket (1). The length of the external thread of the small diameter section is greater than the length of the threaded through hole of the central shaft (3) of the hanging bracket (1). The outer diameter of the small diameter section is smaller than the inner diameter of the small diameter section of the bearing inner hole. The length of the smooth rod part is greater than the length of the small diameter section of the bearing inner hole. The outer diameter of the large diameter section of the hanging shaft (2) is greater than the inner diameter of the small diameter section of the bearing inner hole and smaller than the inner diameter of the large diameter section of the bearing inner hole.

7. A heat treatment lifting tool for bearing-type steel parts according to claim 6, characterized in that, The guide angle at the connection between the large diameter section and the small diameter section of the hanging shaft (2) is 45°.

8. A heat treatment lifting tool for bearing-type steel parts according to claim 6 or 7, characterized in that, The hanging shaft (2) is made of stainless steel.

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