Honing clamp

Abstract

The utility model discloses a honing fixture, which relates to the technical field of part processing equipment and comprises a fixture body, the fixture body is provided with an accommodating cavity, a thin-wall sleeve is sleeved in the accommodating cavity, the peripheries of the end parts of two sides of the thin-wall sleeve extend to form annular bosses, and each annular boss is abutted against the inner wall of the fixture body. The outer wall of the thin-wall sleeve and the inner wall of the clamp body form a tensioning part, the tensioning part is used for being filled with liquid plastic, the end face of the clamp body is provided with two injection holes parallel to the axis of the clamp body, the injection holes are communicated with the tensioning part, after the tensioning part is filled with the liquid plastic, pressure plugs are arranged in the injection holes, and after the liquid plastic is solidified, the injection holes are filled with solid plastic. According to the honing clamp, the technical problem that the size of an inner hole of the produced thin-wall part and the shape and position of the part are deviated due to the fact that liquid plastic in the clamp is solidified and shrunk and the acting force applied by the clamp is unbalanced is solved.

Description

Technical Field

[0001] This utility model relates to the field of parts processing equipment technology, and in particular to a honing fixture. Background Technology

[0002] Honing fixtures are widely used in the manufacturing of thin-walled parts. As product quality continues to improve, the dimensional accuracy requirements for various parts of the parts are becoming increasingly stringent. Consequently, honing fixtures for machining thin-walled parts have been improved. To ensure uniform force on the outer periphery of thin-walled parts during machining, internal expansion honing fixtures are widely used. However, when existing internal expansion honing fixtures are filled with liquid plastic, the liquid plastic shrinks due to its physical properties, preventing the solid plastic from completely filling the honing fixture. This results in uneven clamping force on the workpiece, leading to a decrease in the dimensional accuracy of the produced thin-walled parts.

[0003] In summary, developing a honing fixture that ensures uniform stress on the workpiece and high accuracy in the internal dimensions and geometric tolerances of the machined part is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this utility model is to provide a honing fixture that solves the technical problems of uneven clamping force on the workpiece, inconsistent inner hole size of the processed product, and large deviation in the shape and position of the inner hole.

[0005] To achieve the above objectives, this utility model provides a honing fixture, comprising: a fixture body having a receiving cavity, a thin-walled sleeve being fitted inside the receiving cavity, and annular bosses extending from the outer periphery of both ends of the thin-walled sleeve, each annular boss abutting against the inner wall of the fixture body, so that the outer wall of the thin-walled sleeve and the inner wall of the fixture body form a tensioning part, the tensioning part being used to fill liquid plastic, and two injection holes parallel to their axes being provided on the end face of the fixture body, the injection holes communicating with the tensioning part; when the tensioning part is filled with liquid plastic, a pressure plug is installed in the injection hole; after the liquid plastic solidifies, solid plastic is added to the injection hole to make the tensioning part uniformly tightened.

[0006] Preferably, the fixture body is also provided with a liquid storage tank, which is located on the side opposite to the injection hole port. The liquid storage tank is coaxially arranged with the thin-walled sleeve. The diameter of the liquid storage tank is larger than the diameter of the receiving cavity and smaller than the distance between the axis of the injection hole and the axis of the thin-walled sleeve. The distance between the port of the liquid storage tank and the port of the thin-walled sleeve is smaller than the depth of the injection hole. The liquid storage tank connects the tensioning part with the injection hole and is used to store liquid.

[0007] Preferably, the end of the clamp body away from the injection hole is provided with a number of fixing holes, which fix the clamp body to the connecting plate.

[0008] Preferably, the annular boss includes a first annular boss and a second annular boss. The first annular boss is located at the end opposite to the fixing hole. The end face of the first annular boss near the fixing hole is provided with an annular groove, which increases the tensioning area of ​​the thin-walled sleeve.

[0009] Preferably, both the first annular boss and the second annular boss are interference-fitted with the inner wall of the clamp body, so that the tensioning part has reliable sealing.

[0010] Preferably, the portion of the sidewall of the clamp body that does not abut against the first annular boss and the second annular boss extends toward the outer periphery of the clamp body, thereby increasing the thickness of the tensioning portion.

[0011] Preferably, the injection holes are symmetrically distributed at both ends of the same diameter of the fixture body.

[0012] Preferably, both ends of the connecting plate are provided with a first connecting ring and a second connecting ring extending outwards. The first connecting ring and the second connecting ring are provided with a plurality of connecting holes. The axis of the connecting holes is parallel to the axis of the connecting plate. The connecting plate is used to support the fixture body.

[0013] Preferably, the fixture body, thin-walled sleeve, and connecting plate are arranged coaxially.

[0014] Compared to the aforementioned background technology, the honing fixture provided by this utility model includes a fixture body, an internal cavity for receiving the fixture body, a thin-walled sleeve fitted inside the cavity, the diameter of the thin-walled sleeve being smaller than the inner wall size of the cavity, and annular bosses on both sides of the thin-walled sleeve. The outer wall of the annular bosses abuts against and fits against the inner wall of the fixture body, forming a cavity between the outer wall of the thin-walled sleeve and the inner wall of the fixture body. This cavity serves as a tensioning part, used to fill liquid plastic. Two injection holes, parallel to the axis of the fixture body, are provided on the end face of the fixture body. These injection holes communicate with the cavity of the tensioning part and are used to fill the tensioning part with liquid plastic. After the tensioning part is filled with liquid plastic, a [further details about the injection holes are missing]. Place the pressure plug, fix one side of the pressure plug and press the other side of the pressure plug. The pressure is applied to the liquid plastic through the pressure plug. The liquid plastic squeezes the thin-walled sleeve, and the side wall of the thin-walled sleeve deforms towards the axis of the fixture body. When the liquid plastic solidifies, due to thermal expansion and contraction, the volume of the liquid plastic decreases and the liquid plastic cannot completely fill the tensioning part. In order to ensure that the clamping range of the thin-walled sleeve is uniform and the clamping force is reliable, continue to add solid plastic blocks into the tensioning part through the injection hole and press the pressure plug in the injection hole to make the tensioning part completely filled. This avoids the uneven clamping force of the honing fixture on the workpiece caused by thermal expansion and contraction of the liquid plastic, which would prevent the product dimensions from being inconsistent and having sufficient geometric tolerances. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the connecting disc, thin-walled sleeve, and clamp body assembly provided in an embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of the clamp body provided in an embodiment of the present utility model;

[0018] Figure 3 This is a cross-sectional view of the thin-walled sleeve provided in an embodiment of the present utility model;

[0019] Figure 4 This is a cross-sectional view of the connecting disc provided in an embodiment of the present utility model;

[0020] Figure 5 This is a top view of the clamp body provided in an embodiment of the present utility model.

[0021] Wherein, 1-clamp body; 2-thin-walled sleeve; 3-tensioning part; 4-injection hole; 5-liquid storage tank; 6-first annular boss; 61-annular groove; 7-second annular boss; 8-connecting plate; 81-first connecting ring; 82-second connecting ring; 9-fixing hole; 10-connecting hole; 11-accommodating cavity. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] This utility model provides a honing fixture, which includes a fixture body 1, a receiving cavity 11 inside the fixture body 11, and a thin-walled sleeve 2 inside the receiving cavity 11. The diameter of the side wall of the thin-walled sleeve 2 is smaller than the diameter of the receiving cavity 11, i.e., the distance between the thin-walled sleeve 2 and the receiving cavity 11 is set. Both ends of the thin-walled sleeve 2 are provided with annular bosses extending towards the outer periphery of the thin-walled sleeve 2. The side walls of the annular bosses fit against the inner wall of the receiving cavity 11. The opposite end faces of the various bosses, the side walls of the thin-walled sleeve 2, and the inner wall of the fixture body 1 form the tensioning part 3 of the honing fixture. Two injection holes 4 are provided on the end face of the fixture body 1. The axis of each injection hole 4 is parallel to the axis of the fixture body 1. The injection holes 4 are connected to the tensioning part 3, i.e., the operator can inject material into the tensioning part 3 through the injection holes 4. Liquid plastic is filled into the cavity of the tensioning part 3. After the tensioning part 3 is filled with liquid plastic, a pressure plug is set in the injection hole 4. The end of the pressure plug squeezes the liquid plastic, causing the liquid plastic to flow and squeeze the thin-walled sleeve 2 in the direction of the axis of the fixture body 1. The inner diameter of the thin-walled sleeve 2 is reduced, and the thin-walled sleeve 2 forms a clamping structure. After the liquid plastic solidifies, the volume of the liquid plastic shrinks due to its own physical properties, causing gaps to appear in the cavity that was originally filled in the tensioning part 3. The tensioning force on the thin-walled sleeve 2 is unevenly distributed, and the clamping force acting on the workpiece is also uneven. At this time, the pressure plug is pulled out, and solid plastic is continued to be added into the thin-walled sleeve 2 through the injection hole 4 so that the solid plastic fills the gaps in the tensioning part 3, and the clamping force of the thin-walled sleeve 2 is evenly distributed in all parts of the workpiece.

[0025] The honing fixture provided by this utility model uses an internal expansion method. Liquid plastic is filled into the honing fixture, and pressure is applied to the liquid plastic. The fluidity of the liquid plastic evenly distributes the pressure onto the thin-walled sleeve 2, reducing the inner diameter of the thin-walled sleeve 2. This clamps and fixes the workpiece placed inside the thin-walled sleeve 2 and tightly against its inner wall. In addition, the injection hole 4 of the honing fixture tensioning part 3 is located on the end face of the fixture body 1. After the liquid plastic solidifies, a gap appears in the tensioning part 3. At this time, the pressure plug is pulled out and solid plastic is added to the tensioning part 3. The secondary filling operation through the injection hole 4 is simple and does not require disassembling the honing fixture. At the same time, it ensures that the workpiece inside the honing fixture is subjected to uniform force and remains stable during the processing of the workpiece, thereby improving the dimensional consistency and geometric tolerance accuracy of the inner hole of the product.

[0026] Please refer to the instruction manual appendix. Figure 2The clamp body 1 also has a liquid storage tank 5 on the side opposite to the port of the injection hole 4. The liquid storage tank 5 is coaxially arranged with the clamp body 1. The diameter of the liquid storage tank 5 is larger than the radius of the receiving cavity 11, and the radius of the liquid storage tank 5 is smaller than the distance between the axis of the injection hole 4 and the axis of the clamp body 1. The distance between the port of the liquid storage tank 5 and the port of the clamp body 1 is smaller than the depth of the injection hole 4. That is to say, a part of the injection hole 4 extends into the liquid storage tank 5, and the injection hole 4 is connected to the liquid storage tank 5. In addition, the diameter of the liquid storage tank 5 is larger than that of the receiving cavity 11, that is, the receiving cavity 11 is located inside the liquid storage tank 5. Naturally, the tensioning part 3 formed in the receiving cavity 11 is located in the liquid storage tank 5 and is connected to the liquid storage tank 5. The material hole 4 is connected to the tensioning part 3 through the liquid storage tank 5. Liquid plastic is injected into the liquid storage tank 5 through the material hole 4. Some of the liquid plastic enters the tensioning part 3 and some remains in the liquid storage tank 5. When the tensioning part 3 is full of liquid plastic, a pressure plug is set in the material hole 4. Since the material hole 4 is partially connected to the liquid storage tank 5, the bottom of the pressure plug squeezes the liquid plastic in the liquid storage tank 5. The liquid plastic in the liquid storage tank 5 is squeezed into the tensioning part 3. The side wall thickness of the thin-walled sleeve 2 is small. The excess liquid plastic causes the side wall of the thin-walled sleeve 2 to bulge in the direction of the axis of the clamp body 1. Due to the fluidity of the liquid, the liquid plastic exerts the same force on all parts of the thin-walled sleeve 2. The thin-walled sleeve 2 clamps and fixes the workpiece placed inside it.

[0027] It should be noted that the fixture body 1 has a number of fixing holes 9 evenly distributed on the end away from the injection hole 4. The axial direction of each fixing hole 9 is parallel to the axial direction of the fixture body 1. The fixing holes 9 fix the fixture body 1 to the connecting plate 8. Both ends of the connecting plate 8 are provided with a first connecting ring 81 and a second connecting ring 82 extending towards the outer periphery of the connecting plate 8. The first connecting ring 81 is closer to the fixture body 1 than the second connecting ring 82. The diameter of the first connecting ring 81 is smaller than the diameter of the second connecting ring 82. A number of connecting holes 10 are evenly distributed on the first connecting ring 81 and the second connecting ring 82. The axis of the connecting hole 10 is parallel to the axis of the connecting plate 8. The connecting holes 10 connect the connecting plate 8 to the machining lathe. The lathe grinds the workpiece to be processed in the honing fixture.

[0028] Furthermore, the annular bosses on the outer periphery of the thin-walled sleeve 2 are specifically a first annular boss 6 and a second annular boss 7. The first annular boss 6 is located on the side near the injection hole 4. The sides of the first annular boss 6 and the second annular boss 7 opposite each other are provided with annular grooves 61. The inner wall size of the annular groove 61 is equal to the outer wall size of the thin-walled sleeve 2. By setting the annular groove 61, the tensioning area of ​​the tensioning part 3 is increased, so that the thin-walled sleeve 2 can fully clamp the workpiece to be processed inside it.

[0029] In addition, the dimensions of the first annular boss 6 and the second annular boss 7 are slightly larger than the diameter of the receiving cavity 11. That is, the first annular boss 6 and the second annular boss are set inside the receiving cavity 11 by interference fit. The interference fit ensures that the tensioning part 3 has good sealing performance, preventing the liquid plastic from overflowing from the gap between the thin-walled sleeve 2 and the fixture body 1 when the pressure plug squeezes the liquid plastic, reducing the clamping force of the honing fixture on the workpiece to be processed, and the overflowing liquid plastic will affect the subsequent honing work.

[0030] Please refer to the instruction manual appendix. Figure 1 The portion of the inner wall of the fixture body 1 that does not abut against the annular groove extends in a direction away from the axis of the fixture body 1. That is, the diameter of the side wall of the part of the fixture body 1 that forms the tensioning part 3 is larger than the side wall located at both ends of the fixture body 1 that abuts against the first annular boss 6 and the second annular boss 7. The fixture body 1 with this structure increases the thickness of the tensioning part 3. After the liquid plastic fills the tensioning part 3, the thickness of the solid plastic increases. The thin-walled sleeve 2 after tensioning has higher strength, ensuring the reliability of the honing fixture.

[0031] Please refer to the attached instruction manual. Figure 5 Two injection holes 4 are symmetrically distributed on both sides of the end face of the fixture body 1. The two injection holes 4 are located on the same diameter of the fixture body 1. The pressure plug set in one injection hole 4 is fixed, while the pressure plug set in the other injection hole 4 can be further extended into the injection hole 4 to squeeze the liquid plastic and generate tension force in the honing fixture.

[0032] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0033] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A honing fixture, characterized in that, include: The clamp body (1) has a receiving cavity (11) and a thin-walled sleeve (2) is fitted inside the receiving cavity (11). The thin-walled sleeve (2) has annular protrusions extending from the outer periphery of both ends of the thin-walled sleeve (2). Each of the annular protrusions abuts against the inner wall of the clamp body (1), so that the outer wall of the thin-walled sleeve (2) and the inner wall of the clamp body (1) form a tensioning part (3). The tensioning part (3) is used to fill liquid plastic. The end face of the clamp body (1) is provided with two injection holes (4) parallel to its axis. The injection holes (4) are connected to the tensioning part (3). When the tensioning part (3) is filled with liquid plastic, a pressure plug is set in the injection hole (4). After the liquid plastic solidifies, solid plastic is added to the injection hole (4) so ​​that the tensioning part (3) is tightened evenly.

2. The honing fixture according to claim 1, characterized in that, The clamp body (1) is also provided with a liquid storage tank (5). The liquid storage tank (5) is located on the side away from the port of the injection hole (4). The liquid storage tank (5) is coaxially arranged with the thin-walled sleeve (2). The diameter of the liquid storage tank (5) is larger than the diameter of the receiving cavity (11) and smaller than the distance between the axis of the injection hole (4) and the axis of the thin-walled sleeve (2). The distance between the port of the liquid storage tank (5) and the port of the thin-walled sleeve (2) is smaller than the depth of the injection hole (4). The liquid storage tank (5) connects the tensioning part (3) with the injection hole (4). The liquid storage tank (5) is used to store the liquid.

3. The honing fixture according to claim 2, characterized in that, The clamp body (1) has several fixing holes (10) at one end away from the injection hole (4), and the fixing holes (10) fix the clamp body (1) on the connecting plate (8).

4. The honing fixture according to claim 3, characterized in that, The annular boss includes a first annular boss (6) and a second annular boss (7). The first annular boss (6) is located at the end away from the fixing hole (10). The end face of the first annular boss (6) near the fixing hole (10) is provided with an annular groove (61). The annular groove (61) increases the tensioning area of ​​the thin-walled sleeve (2).

5. The honing fixture according to claim 4, characterized in that, The first annular boss (6) and the second annular boss (7) are both interference-fitted with the inner wall of the clamp body (1), so that the tensioning part (3) has reliable sealing.

6. The honing fixture according to claim 5, characterized in that, The portion of the side wall of the clamp body (1) that does not abut against the first annular boss (6) and the second annular boss (7) extends toward the outer periphery of the clamp body (1), thereby increasing the volume of the tensioning part (3).

7. The honing fixture according to claim 6, characterized in that, The injection holes (4) are symmetrically distributed at both ends of the same diameter of the fixture body (1).

8. The honing fixture according to claim 7, characterized in that, Both ends of the connecting disk (8) are provided with a first connecting ring (81) and a second connecting ring (82) extending outward. The first connecting ring (81) and the second connecting ring (82) are provided with a plurality of connecting holes. The axis of the connecting holes is parallel to the axis of the connecting disk (8). The connecting disk (8) is used to support the fixture body (1).

9. The honing fixture according to any one of claims 3-8, characterized in that, The clamp body (1), the thin-walled sleeve (2), and the connecting plate (8) are coaxially arranged.

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