A processing technology for an elastic interlocking block

Abstract

This invention discloses a processing technology for an elastic interlocking block, comprising: S1, pressing: after distributing the powder metallurgy components required for the interlocking block, pressing to form an interlocking block green blank; an axially penetrating concave groove is formed on the interlocking block green blank corresponding to the position of the opening slot, used to reduce the wall thickness of the interlocking block body at that position, and a chamfer is formed at the end of the concave groove; a process protrusion is also formed on the interlocking block green blank, one side of the process protrusion extends to be flush with the end of the interlocking block body, and the other side is connected to an ear-shaped protrusion; S2, sintering: the interlocking block green blank is sintered at high temperature to form an interlocking block preform; S3, machining first step: machining the interlocking block preform, removing the process protrusion and machining a U-shaped positioning transverse groove on the transverse groove protrusion; S4, finishing: finishing the interlocking block preform; S5, machining second step: machining the preform from the concave groove to open the opening slot, then cleaning, full inspection, and completing the processing to obtain the elastic interlocking block.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy technology, and more specifically to a processing technology for an elastic interlocking block. Background Technology

[0002] The interlock block is an important component within the gearbox. It includes an interlock block body, which is a thin-walled cylindrical structure (i.e., a hollow structure) with a through hole. An opening slot is formed along the axial direction on the outer circular wall of the interlock block body. Symmetrical ear-shaped protrusions are also provided on the outer circular wall of the interlock block body, symmetrically arranged on both sides of the opening slot. One ear-shaped protrusion is connected to a transverse groove protrusion on the outer circular wall of the interlock block body. The transverse groove protrusion has a U-shaped positioning transverse groove. The structure of the interlock block is as follows: Figure 1 As shown. Due to the presence of the transverse groove protrusion on the outer circular wall of the interlocking block body and the forming characteristics based on powder metallurgy, process protrusions need to be set on the outer circular wall of the interlocking block body blank opposite to the transverse groove protrusion during the green pressing process. Moreover, the transverse groove and ear-shaped protrusion end faces cannot be directly pressed and need to be "additively processed" during the forming process and then removed by machining.

[0003] Currently, the existing processing technology of interlocking blocks is usually divided into two processing methods: (1) Method 1 includes: green blank pressing (green blank has formed an open groove) → sintering → machining (removing process protrusions and machining U-shaped positioning transverse grooves) → deburring → cleaning → full appearance inspection; (2) Method 2 includes: green blank pressing → sintering → machining (opening grooves, removing process protrusions and machining U-shaped positioning transverse grooves) → deburring → cleaning → full appearance inspection.

[0004] However, both of the commonly used interlocking block processing methods mentioned above have different technological drawbacks. For example, in Scheme 1, the green blank needs to be formed with an opening groove during the green blank pressing process. However, due to the irregularity of the part after green blank sintering, the roundness of the inner hole and the size of the opening groove will fluctuate significantly, which will seriously affect the subsequent dimensional changes of the part. At the same time, in the subsequent machining process, since the part has already had an opening groove, the part will undergo elastic deformation during machining, resulting in dimensional deviations. In Scheme 2, the opening groove is not formed during the green blank pressing process. Instead, it is formed in one machining operation, with the opening groove milled in the last operation. Although Scheme 2 does not cause dimensional problems in the early stages, the part will undergo elastic deformation during the subsequent deburring process, whether using finishing or sandblasting, which will still affect the dimensional accuracy of the part and make it difficult to meet the actual dimensional requirements, resulting in lower precision. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing interlock block processing techniques affect part dimensions, resulting in low dimensional accuracy and failure to meet customer requirements. A new processing technique for elastic interlock blocks is proposed to solve the problem of low processing accuracy in existing interlock block processing techniques.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] This invention provides a manufacturing process for an elastic interlock block, the elastic interlock block comprising the following structural configuration:

[0008] The interlocking block body is configured as a hollow thin-walled cylindrical structure, and an axial through-hole slot is provided on the outer circular wall of the interlocking block body;

[0009] Two ear-shaped protrusions are symmetrically arranged on the outer circular wall of the interlocking block body, and the two ear-shaped protrusions are respectively arranged on both sides of the opening slot;

[0010] And a transverse groove protrusion, which is disposed on the outer circular wall of the interlocking block body. One side of the transverse groove protrusion extends to be flush with the end of the interlocking block body, and the other side is connected to one of the ear-shaped protrusions. The transverse groove protrusion is also provided with a U-shaped positioning transverse groove extending circumferentially along the interlocking block body.

[0011] The manufacturing process of the elastic interlock block includes the following steps:

[0012] S1. Pressing and forming: After distributing the powder metallurgy components required for the interlocking block, press it to form a green interlocking block.

[0013] The interlocking block blank has an axially penetrating concave groove pressed into the position corresponding to the opening slot. The concave groove is used to reduce the wall thickness of the interlocking block body at that position. A chamfer is also pressed into the end of the concave groove. A process protrusion is also pressed into the interlocking block blank. One side of the process protrusion extends to be flush with the other end of the interlocking block body, and the other side of the process protrusion is connected to the ear-shaped protrusion (specifically, the transverse groove protrusion and the process protrusion are connected to the same ear-shaped protrusion, and the transverse groove protrusion and the process protrusion are respectively disposed on both sides of the ear-shaped protrusion. One side of the transverse groove protrusion and the process protrusion respectively extends to be flush with both ends of the hollow thin-walled cylindrical interlocking block body).

[0014] S2. Sintering: The interlocking block green blank is sintered at high temperature to form an interlocking block preform. The structure does not change after sintering, but the strength changes.

[0015] S3. Machining sequence: Machining the interlock block preform to remove the process protrusion and machine a U-shaped positioning transverse groove on the transverse groove protrusion;

[0016] S4. Finishing: Perform surface finishing on the interlocking block preform;

[0017] S5. Machining step two: The preform of the interlocking block is machined from the concave groove to open the groove, then cleaned, and the appearance is fully inspected to complete the machining and obtain the elastic interlocking block.

[0018] Furthermore, a processing technology for an elastic interlocking block: In step S1, the wall thickness of the interlocking block body at the thinned portion of the concave groove is denoted as H1, and the wall thickness of the interlocking block body at the unthinned portion is denoted as H, then the following condition is satisfied: H / 5 < H1 < H.

[0019] Furthermore, a processing technology for an elastic interlocking block: the width (groove width) of the concave groove in step S1 and the wall thickness H1 of the thinned interlocking block body satisfy: 1 / 5 groove width < H1 < 4 / 5 groove width.

[0020] Furthermore, a processing method for an elastic interlocking block: in step S1, a chamfer of C0.5 to C1.0 is reserved at the end of the concave groove.

[0021] Furthermore, a processing technology for an elastic interlocking block: the sintering temperature in step S2 is 1100~1150℃.

[0022] Furthermore, a processing method for an elastic interlocking block: the finishing time in step S4 is 5.0 to 10.0 minutes.

[0023] Furthermore, a machining process for an elastic interlocking block is as follows: in step S5, when opening the slot, rough milling is performed first, followed by finish milling, to obtain the slot; wherein, the diameter of the tool used for rough milling and finish milling is set to the width of the slot minus 0.01 to 0.03 mm, and the diameter of the tool used for finish milling is greater than that of the tool used for rough milling.

[0024] Specifically, the axial direction of the interlock block body is the length direction of the opening slot, and the radial direction is its width direction.

[0025] The beneficial effects of this invention are:

[0026] (1) The present invention proposes a new processing technology for elastic interlocking blocks. The improvements of the existing interlocking block processing technology are as follows: ① In the green blank pressing process, the present invention first presses a concave groove structure on the green blank corresponding to the opening groove position. This can minimize the machining allowance of the second machining process, thereby improving the tool life of the second machining process. In addition, the second machining process processes the opening groove separately, avoiding the problem of the part being deformed again after the groove is opened, which affects the product size. ② The present invention also reserves a chamfer at the opening groove position during the green blank pressing process. This can prevent burrs and effectively avoid burr problems when milling the opening groove in the later stage, thereby avoiding affecting the dimensional accuracy of the part.

[0027] (2) The machining process of the present invention removes the forming process protrusions and forms the U-shaped positioning transverse groove in the first machining step, which can avoid the influence of subsequent machining on the opening groove size. The process of the present invention adopts a finishing deburring method after machining, which can effectively remove the burrs brought by the first machining step and effectively eliminate the stress of the part itself, avoiding the deformation of the opening groove size of the part due to stress release in the subsequent opening groove machining process. In addition, the second machining step of the present invention adopts a machining process of rough milling followed by finish milling. Since the part has undergone rough milling before finish milling, the deformation of the part can be further reduced.

[0028] (3) The processing technology of the elastic interlocking block provided by the present invention adopts the process of pressing, sintering, machining first step, finishing, machining second step, and cleaning. The processing of the opening groove is placed in the last step. At the same time, during the green forming process, a chamfer is reserved at the position of the opening groove to avoid burrs during the milling of the opening groove, thereby making the opening groove size stable during the processing, the product precision is high, and it meets the customer requirements. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the interlock block structure;

[0031] Figures 2-3 This is a schematic diagram of the structure of the interlocking block green blank formed by pressing in step S1 of embodiment 1 of the present invention;

[0032] Figure 4 for Figure 2 The enlarged view of part A in the middle is a schematic diagram of the main body of the concave groove thinning interlocking block;

[0033] Figure 5 This is a schematic diagram of the structure of the interlocking block preform formed after the machining process in step S3 of Embodiment 1 of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the elastic interlocking block formed after the machining process in step S5 of Embodiment 1 of the present invention. Figure 1 The interlock blocks shown have the same structure.

[0035] The markings in the image are as follows:

[0036] 1-Interlocking block body, 2-Ear-shaped protrusion, 3-Horizontal groove protrusion, 4-Interlocking block blank, 11-Opening groove, 31-U-shaped positioning horizontal groove, 41-Concave groove, 42-Chamfer, 43-Process protrusion. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0039] Example 1

[0040] like Figures 1-6 As shown, this embodiment 1 provides a processing technology for an elastic interlock block, the interlock block comprising the following structural configuration:

[0041] The interlocking block body 1 is configured as a hollow thin-walled cylindrical structure, and an opening groove 11 penetrating both ends is provided on the outer circular wall of the interlocking block body 1.

[0042] Two ear-shaped protrusions 2 are symmetrically arranged on the outer circular wall of the interlocking block body 1, and the two ear-shaped protrusions are respectively arranged on both sides of the opening groove 11;

[0043] And a transverse groove protrusion 3, which is disposed on the outer circular wall of the interlocking block body 1. One side of the transverse groove protrusion 3 extends to be flush with the end of the interlocking block body 1, and the other side is connected to one of the ear-shaped protrusions 2. A U-shaped positioning transverse groove 31 extending circumferentially along the interlocking block body 1 is provided on the transverse groove protrusion 3.

[0044] The manufacturing process of the elastic interlock block includes the following specific steps:

[0045] S1. Pressing and forming: After dispensing the required powder metallurgy components for the interlocking block, press them into an interlocking block blank 4 using a CNC forming press.

[0046] The interlocking block blank 4 has an axially penetrating concave groove 41 pressed into it at the position corresponding to the opening groove 11. This groove is used to reduce the wall thickness of the interlocking block body 1 at the location of the concave groove 41. Chamfers 42 are also pressed into both ends of the concave groove 41 (equivalent to reserving chamfers 42 at the ends of the interlocking block blank 4 at the position corresponding to the opening groove 11). Process protrusions 43 are also pressed into the interlocking block blank 4. (Due to the presence of the transverse groove protrusions 3 on the outer circular wall of the interlocking block body 1, based on the forming characteristics of powder metallurgy, it is necessary to form process protrusions 43 on the interlocking block blank 4.) During the pressing and forming process of billet 4, a process protrusion 43 is set on the outer circular wall of the interlocking block body billet at a position opposite to the transverse groove protrusion 3. One side of the process protrusion 43 extends to be flush with the other end of the interlocking block body 1, and the other side is connected to the ear-shaped protrusion 2. Specifically, the transverse groove protrusion 3 and the process protrusion 43 are connected to the same ear-shaped protrusion 2, and the transverse groove protrusion 3 and the process protrusion 43 are respectively set on both sides of the ear-shaped protrusion 2. One side of the transverse groove protrusion 3 and the process protrusion 43 extends to be flush with both ends of the hollow thin-walled cylindrical interlocking block body 1.

[0047] Specifically, in step S1, the wall thickness of the interlock block body 1 at the thinning point of the concave groove 41 is denoted as H1, and the wall thickness of the interlock block body 1 without the thinning point is denoted as H. Then, H / 5 < H1 < H is satisfied. The width (groove width) of the concave groove 41 and the wall thickness H1 of the interlock block body at the thinning point satisfy 1 / 5 groove width < H1 < 4 / 5 groove width. The two ends of the concave groove 41 are also reserved with chamfers of C0.5 to C1.0.

[0048] S2. Sintering: The interlocking block green blank 4 is sintered at a high temperature of 1100-1150°C to form an interlocking block preform.

[0049] S3. Machining sequence: The interlocking block preform is machined to remove the process protrusion 43, and a U-shaped positioning transverse groove 31 is machined on the transverse groove protrusion 3.

[0050] S4. Finishing: Perform surface finishing on the interlocking block preform for 5.0 to 10.0 minutes;

[0051] S5. Machining Step 2: The preform of the interlocking block is first rough milled from the concave groove 41, and then finish milled to mill the opening groove 11 (when milling the opening groove 11, the diameter of the tool used for rough milling and finish milling is set to the width of the opening groove 11 minus 0.01 to 0.03 mm, and the diameter of the tool used for finish milling is greater than that of the tool used for rough milling). Then, it is cleaned, and a full visual inspection is performed to complete the machining and obtain the elastic interlocking block.

[0052] Specifically, in this embodiment, the interlocking block blank 4 is made of low-carbon steel. Its sintered microstructure consists of ferrite and pearlite, resulting in low strength (surface hardness approximately 80HB). This makes the part prone to deformation during subsequent machining and clamping, leading to dimensional deviations. Therefore, this embodiment provides a machining process to address the problem of part deformation and poor dimensional accuracy during subsequent machining of interlocking blocks made of this material. Furthermore, to reduce deformation during milling, single-sided climb milling can be used to control cutting accuracy, reduce cutting thickness, ensure consistent cutting texture, and further minimize part deformation.

[0053] The processing technology for this elastic interlocking block provided by the present invention eliminates the need to pre-form the opening groove during the green pressing process of the interlocking block. Instead, during the green pressing process, a concave groove structure corresponding to the opening groove is pre-pressed on the green blank to reduce the wall thickness of the interlocking block body. Since the opening groove is not pre-formed on the green blank, the problem of elastic deformation caused by the pre-formed opening groove during subsequent processing is avoided, ensuring the dimensional accuracy of the part. Furthermore, the concave groove structure reduces the machining allowance when milling the opening groove, thereby increasing the tool life. Simultaneously, this processing technology also provides an anti-burr chamfer on the green blank corresponding to the opening groove position during the green pressing process. This effectively avoids burrs during subsequent machining of the opening groove, thus solving the problem in existing interlocking block processing technologies where elastic deformation of the part occurs during deburring, affecting the dimensional accuracy of the product.

[0054] The above-described preferred embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the invention. Any obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A processing technology for an elastic interlocking block, characterized in that, The interlock block includes: The interlocking block body (1) is configured as a hollow thin-walled cylindrical structure, and an opening groove (11) is axially opened on its outer circular wall to pass through both ends. Two ear-shaped protrusions (2) are symmetrically arranged on the outer circular wall of the interlocking block body (1) and are respectively located on both sides of the opening slot (11); And a transverse groove protrusion (3), which is disposed on the outer circular wall of the interlocking block body (1), one side of which extends to be flush with the end of the interlocking block body (1), and the other side is connected to the ear-shaped protrusion (2). The transverse groove protrusion (3) is provided with a U-shaped positioning transverse groove (31) extending circumferentially along the interlocking block body (1). The manufacturing process of this interlock block includes: S1. Pressing and forming: After distributing the powder metallurgy components required for the interlocking block, press them to form a green interlocking block (4); The interlocking block blank (4) has an axially penetrating concave groove (41) at the position corresponding to the opening groove (11) to reduce the wall thickness of the interlocking block body (1) at that position. The end of the concave groove (41) has a chamfer (42). The interlocking block blank (4) also has a process protrusion (43). One side of the process protrusion (43) extends to be flush with the other end of the interlocking block body (1), and the other side is connected to the ear-shaped protrusion (2). S2, Sintering: The interlocking block green blank (4) is sintered at high temperature to form an interlocking block preform; S3, Machining sequence: Machining the interlock block preform, removing the process protrusion (43) and machining a U-shaped positioning transverse groove (31) on the transverse groove protrusion (3); S4. Finishing: Perform surface finishing on the interlocking block preform; S5. Machining step 2: The preform is machined at the concave groove (41) to open the opening groove (11), then cleaned, fully inspected, and the machining is completed to obtain the elastic interlocking block.

2. The processing technology of the elastic interlocking block according to claim 1, characterized in that, In step S1, the wall thickness of the interlock block body (1) at the thinned part by the concave groove (41) is denoted as H1, and the wall thickness of the interlock block body (1) at the unthinned part is denoted as H. Then, the following condition is satisfied: H / 5 < H1 < H.

3. The processing technology of an elastic interlocking block according to claim 2, characterized in that, The width of the concave groove (41) in step S1 and the wall thickness H1 of the interlocking block body (1) at the thinning point satisfy: 1 / 5 groove width < H1 < 4 / 5 groove width.

4. The processing technology of an elastic interlocking block according to claim 1, characterized in that, In step S1, a chamfer (42) of C0.5 to C1.0 is reserved at the end of the concave groove (41).

5. The processing technology of an elastic interlocking block according to claim 1, characterized in that, The sintering temperature in step S2 is 1100–1150 °C.

6. The processing technology of an elastic interlocking block according to claim 1, characterized in that, The finishing time in step S4 is 5.0 to 10.0 minutes.

7. The processing technology of an elastic interlocking block according to claim 1, characterized in that, In step S5, when opening the opening slot (11), rough milling is performed first, followed by finish milling, in order to obtain the opening slot (11). The diameter of the tool used for rough milling and finish milling is set to the width of the slot minus 0.01 to 0.03 mm, and the diameter of the tool used for finish milling is greater than that of the tool used for rough milling.

Images