Tool clamp for machining difficult outer circle grinding

Abstract

The tool clamp comprises a cylindrical base, the outer wall of the cylindrical base is sleeved with a positioning steel sleeve in a close fit mode, the positioning steel sleeve comprises a clearance layer, a first inner hole ring wall and a second inner hole ring wall, the inner diameter of the first inner hole ring wall is matched with the outer diameter of the cylindrical base, and the inner diameter of the second inner hole ring wall is matched with the outer diameter of the cylindrical base. The second inner hole annular wall is matched with the outer diameter size of a blank thin step part of a blank product, the end face of the blank thin step part is tightly attached to the clearance layer and abuts against one end of the cylindrical base, and an ejector pin base is tightly attached to the end face of a blank round bar part of the blank product. Through the design of the tool clamp, the machining efficiency of solid round bar products with steps is improved, the tool clamp is suitable for batch production, the material cost and the machining time are effectively saved, and the beneficial effects of reducing the machining difficulty, improving the production efficiency and avoiding material waste are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of workholding fixtures, and more specifically, to a workholding fixture for difficult-to-machine external circle grinding. Background Art

[0002] In the process of grinding and processing workpieces, there is often a kind of solid round bar product with a thin step. The characteristics of this product are: the value of height divided by diameter is less than 0.25 mm, it is flat, and the larger the diameter, the higher the grinding processing difficulty.

[0003] The processing requirements for this product are as follows:

[0004] The outer circle surface of the product needs to be ground, and the tolerance requirements for dimensions A and B are ±0.02; the thickness of the product and the step size need to be surface-ground, and the surface roughness requirement is Ra0.4.

[0005] The difficulties in grinding and processing this product are as follows:

[0006] 1. This product has no inner hole and is a solid round bar product with a step. It is impossible to install and clamp with a core rod for external circle grinding;

[0007] 2. The step size is small, and when performing external circle grinding, it is impossible to use a three-jaw chuck for clamping and processing.

[0008] There are three common existing processing methods, which are respectively:

[0009] 1. Using a high-precision coordinate grinder or a CNC machining center for grinding; this method can ensure the precision dimensions and geometric tolerance dimensions of the product, but it requires relying on high-precision processing equipment, with a long processing time, high processing cost, and expensive consumables.

[0010] 2. Increasing the product schematic dimension C by 10 to reserve the clamping position of the three-jaw chuck;

[0011] This method increases the outer circle clamping position of the product, facilitating the clamping and processing of the product's outer circle. However, it wastes materials, is not suitable for batch product processing, and requires adding a wire cutting process to remove the excess materials.

[0012] 3. Designing the blank as two products combined back to back, and adding a center hole to the product. The finished product is processed into two parts from the middle by a wire cutting process; this method can be used for batch production and processing, but the blank processing is difficult, time-consuming, and causes material waste.

[0013] Currently, for the grinding and processing of the above products, there is temporarily no workholding fixture that can meet the requirements of suitable for batch production, high processing efficiency, and effectively saving material costs and processing time. Summary of the Utility Model

[0014] In view of the above technical problems in the related art, the present utility model proposes a fixture for difficult machining of external circle grinding, which can overcome the above deficiencies of the prior art.

[0015] To achieve the above technical purpose, the technical solution of the present utility model is realized as follows:

[0016] A fixture for difficult machining of external circle grinding;

[0017] The fixture for difficult machining of external circle grinding includes a cylindrical base, and a positioning steel sleeve is tightly sleeved on the outer wall of the cylindrical base. The positioning steel sleeve includes a clearance layer, a first inner hole ring wall and a second inner hole ring wall. The size of the inner diameter of the first inner hole ring wall is adapted to the outer diameter size of the cylindrical base, and the size of the second inner hole ring wall is adapted to the outer diameter size of the blank thin step part of the blank product. The end face of the blank thin step part is tightly attached to the clearance layer and abuts against one end of the cylindrical base. A thimble base is tightly attached to the end face of the blank round bar part of the blank product.

[0018] Further, a thimble center hole is provided at the center of the end of the thimble base away from the blank round bar part, and the thimble center hole abuts against the tailstock of the machine tool.

[0019] Further, one end of the cylindrical base away from the blank thin step part is fixedly connected to the three-jaw chuck of the external circle grinding machine.

[0020] Further, the positioning steel sleeve is sleeved on the periphery of the cylindrical base.

[0021] Further, the first inner hole ring wall of the positioning steel sleeve is tightly fitted with the outer wall of the cylindrical base and can slide left and right.

[0022] Further, the clearance layer is a clearance layer protruding a certain distance height, and the clearance layer prevents the positioning steel sleeve from being simultaneously adsorbed on the positioning steel sleeve when using strong glue for adhesion.

[0023] Further, the end face of the blank thin step part of the blank product is fixedly connected to the right end of the cylindrical base by a kind of strong glue, and the movement range of the blank product is restricted by the positioning steel sleeve to achieve concentric positioning.

[0024] Further, one end of the cylindrical base away from the blank thin step part is connected to the machine tool chuck, and a magnet is provided on the machine tool chuck.

[0025] Further, the cylindrical base, the positioning steel sleeve and the thimble base are all steel parts.

[0026] Further, the diameter of the cylindrical base is 5-10 mm smaller than the diameter of the blank round bar portion of the blank product to ensure the effective contact area between the cylindrical base and the blank product.

[0027] The beneficial effects of the present utility model: Through the design of the fixture for the product of the present utility model, the processing efficiency of the solid round bar products with steps is improved, suitable for mass production, and the material cost and processing time are effectively saved, thus achieving the beneficial effects of reducing the processing difficulty, improving the production efficiency and avoiding material waste. Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 is a schematic assembly and positioning state diagram of a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0030] Figure 2 is a schematic diagram of the retracted positioning steel sleeve state of a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0031] Figure 3 is a structural diagram of the positioning steel sleeve of a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0032] Figure 4 is a front view of the blank product applicable to a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0033] Figure 5 is a top view of the blank product applicable to a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0034] Figure 6 is a front view of the finished product applicable to a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0035] Figure 7 is a top view of the finished product applicable to a fixture for difficult-to-machine external circle grinding according to an embodiment of the present utility model;

[0036] In the figure: 1. Cylindrical base; 2. Positioning steel sleeve; 201. Clearance layer; 202. First inner hole ring wall; 203. Second inner hole ring wall; 3. Blank product; 301. Blank round bar part; 302. Blank thin step part; 4. Thimble base; 401. Thimble center hole; 5. Finished product; 501. Finished round bar part; 502. Finished thin step part. Detailed implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0038] It should be understood that in the description of the embodiments of the present invention, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "several" means two or more, unless otherwise specifically defined.

[0039] As Figure 1-3 shown, a fixture for difficult-to-machine external circle grinding according to an embodiment of the present invention includes a cylindrical base 1, and a positioning steel sleeve 2 is tightly sleeved on the outer wall of the cylindrical base 1. The positioning steel sleeve 2 includes a clearance layer 201, a first inner hole ring wall 202 and a second inner hole ring wall 203. The size of the inner diameter of the first inner hole ring wall 202 is adapted to the outer diameter size of the cylindrical base 1, and the second inner hole ring wall 203 is adapted to the outer diameter size of the blank thin step part 302 of the blank product 3. The end face of the blank thin step part 302 is tightly attached to the clearance layer 201 and abuts against one end of the cylindrical base 1. The end face of the blank round bar part 301 of the blank product 3 is tightly attached to a thimble base 4.

[0040] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, a center hole 401 of a center pin is provided at the center of the end of the center pin base 4 away from the blank round bar portion 301, and the center hole 401 of the center pin abuts against the tailstock of the machine tool.

[0041] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, one end of the cylindrical base 1 away from the blank thin step portion 302 is fixedly connected to the three-jaw chuck of the external cylindrical grinding machine.

[0042] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, the positioning steel sleeve 2 is sleeved around the outer periphery of the cylindrical base 1.

[0043] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, the first inner hole wall 202 of the positioning steel sleeve 2 is in close fit with the outer wall of the cylindrical base 1 and is slidably arranged left and right.

[0044] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, the clearance layer 201 is a clearance layer protruding a certain distance and height, and the clearance layer 201 prevents the positioning steel sleeve 2 from being adsorbed on the positioning steel sleeve 2 at the same time when using strong glue for adhesion.

[0045] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, the end face of the blank thin step portion 302 of the blank product 3 is fixedly connected to the right end of the cylindrical base 1 through a kind of strong glue, and the movement range of the blank product 3 is restricted by the positioning steel sleeve 2 to achieve concentric positioning.

[0046] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, one end of the cylindrical base 1 away from the blank thin step portion 302 is connected to the machine tool chuck, and a magnet is provided on the machine tool chuck.

[0047] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present invention. In a specific embodiment, the cylindrical base 1, the positioning steel sleeve 2 and the center pin base 4 are all steel parts.

[0048] A fixture for difficult-to-machine external cylindrical grinding according to an embodiment of the present utility model. In a specific embodiment, the diameter of the cylindrical base 1 is 5-10 mm smaller than the diameter of the blank round bar portion 301 of the blank product 3 to ensure the effective contact area between the cylindrical base 1 and the blank product 3.

[0049] To facilitate the understanding of the above technical solution of the present utility model, the above technical solution of the present utility model will be described in detail below in terms of specific usage methods.

[0050] In specific use, a fixture for difficult-to-machine external cylindrical grinding according to the present utility model is applicable to solid thin-step round bars with a value of height divided by diameter less than 0.25 mm. It includes a cylindrical base 1, a positioning steel sleeve 2, and a thimble base 4; all component materials are steel parts. In addition, Figure 1 and Figure 2 The part 3 in it is the blank product.

[0051] The specific way of the fixture in terms of design is as follows:

[0052] Dimensions of the cylindrical base 1: The diameter dimension is about 5-10 mm smaller than the minimum outer diameter of the blank product 3. It should not be too small, and the effective contact area between the blank product 3 and the cylindrical base 1 should be ensured so that the blank product 3 can adhere firmly to the cylindrical base 1.

[0053] Dimensions of the positioning steel sleeve 2: The first inner hole ring wall 202 is adapted to the outer circle dimension of the cylindrical base 1, and the second inner hole ring wall 203 is adapted to the blank dimension of the outer diameter of the blank product 3.

[0054] A clearance layer 201 of 1-1.5 mm is reserved at the bottom surface of the blank product 3 in contact with the positioning steel sleeve 2 to prevent the positioning steel sleeve 2 from being adsorbed on the positioning steel sleeve 2 at the same time when using strong glue for adhesion.

[0055] A fixture for difficult-to-machine external cylindrical grinding according to the product of the present utility model. In a specific embodiment, its specific design dimensions are as follows:

[0056] Dimensions of the finished product 5: The thickness of the finished product 5 is 13 mm, the diameter of the finished thin-step portion 502 is 104.90 mm, the thickness of the finished thin-step portion 502 is 1.8 mm, and the diameter of the finished round bar portion 501 is 96.5 mm;

[0057] Dimensions of the blank product 3: The thickness of the blank product 3 is 13.6 mm, the diameter of the blank thin-step portion 302 is 105.90 mm, the thickness of the blank thin-step portion 302 is 2.4 mm, and the diameter of the blank round bar portion 301 is 97.5 mm;

[0058] The outer diameter of the cylindrical base 1 is: 104.9 - 10 ≈ 95 mm, and the length of the cylindrical base 1 is: 90 mm;

[0059] The diameter of the first inner hole ring wall 202 of the positioning steel sleeve 2 is 95 (-0.1 / -0.2) mm, and the diameter of the second inner hole ring wall 203 is 105.9 (-0.1 / -0.2) mm.

[0060] When the tooling fixture is specifically used:

[0061] 1. Clamp the cylindrical base 1 on the three - jaw chuck of the external cylindrical grinding machine and fix it;

[0062] 2. Insert the positioning steel sleeve 2 into the cylindrical base 1;

[0063] 3. Apply a kind of strong glue to the bottom of the product, and cooperate with the positioning steel sleeve 2 to stick the blank product 3 on the cylindrical base 1. Since the positioning steel sleeve 2 restricts the movement range of the blank product 3, the concentricity between the blank product 3 and the tooling fixture is ensured;

[0064] 4. Place the thimble base 4 on the top surface of the blank product 3, and use the tailstock of the machine tool to tighten the product through the thimble center hole 401, as Figure 1 shown;

[0065] 5. Retract the positioning steel sleeve 2, and use a magnet to adsorb the positioning steel sleeve 2 on the machine tool chuck, as Figure 2 shown.

[0066] In summary, by means of the above - mentioned technical solution of the present invention, through the design of the tooling fixture for the products of the present invention, the processing efficiency of solid round bar products with steps is improved, it is suitable for batch production, and the material cost and processing time are effectively saved. Furthermore, the beneficial effects of reducing the processing difficulty, improving the production efficiency and avoiding material waste are achieved.

[0067] The above - mentioned are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixture for difficult external cylindrical grinding, characterized in that: The invention comprises a cylindrical base (1), the outer wall of the cylindrical base (1) being tightly fitted with a positioning steel sleeve (2), the positioning steel sleeve (2) comprising a void-avoiding layer (201), a first inner hole ring wall (202) and a second inner hole ring wall (203), the inner diameter of the first inner hole ring wall (202) being adapted to the outer diameter of the cylindrical base (1), the second inner hole ring wall (203) being adapted to the outer diameter of a blank thin step portion (302) of a blank product (3), the end face of the blank thin step portion (302) being tightly fitted with the void-avoiding layer (201) and abutting against one end of the cylindrical base (1), and the end face of the blank round rod portion (301) of the blank product (3) being tightly fitted with an ejector base (4).

2. A fixture for difficult cylindrical grinding according to claim 1, characterized in that: An ejector center hole (401) is provided at a center portion of the ejector base (4) away from one end of the blank round rod portion (301), and the ejector center hole (401) abuts against the tailstock of the machine tool.

3. A fixture for difficult cylindrical grinding according to claim 1, characterized in that: One end of the cylindrical base (1) away from the thin step portion (302) of the blank is fixedly connected to a three-jaw chuck of an external cylindrical grinding machine.

4. The fixture for difficult cylindrical grinding according to claim 1, characterized in that: The positioning steel sleeve (2) is sleeved on the periphery of the cylindrical base (1).

5. A fixture for difficult cylindrical grinding according to claim 4, characterized in that: The first inner hole ring wall (202) of the positioning steel sleeve (2) is tightly matched with the outer wall of the cylindrical base (1) and can be slidably arranged left and right.

6. A fixture for difficult cylindrical grinding according to claim 5, characterized in that: The air avoidance layer (201) is an air avoidance layer that protrudes to a certain height, and the air avoidance layer (201) prevents the positioning steel sleeve (2) from being simultaneously adsorbed on the positioning steel sleeve (2) when strong glue is used for gluing.

7. A fixture for difficult-to-process cylindrical grinding according to claim 1, characterized in that: The end surface of the blank thin step portion (302) of the blank product (3) is fixedly connected to the right end of the cylindrical base (1) by means of a strong glue, and cooperates with the positioning steel sleeve (2) to limit the range of movement of the blank product (3) to achieve concentric positioning.

8. The fixture for difficult cylindrical grinding according to claim 1, characterized in that: Principle of the cylindrical base (1): one end of the thin step portion (302) of the blank is connected to a machine tool chuck, and a magnet is arranged on the machine tool chuck.

9. A fixture for difficult-to-process cylindrical grinding according to any one of claims 1 to 8, characterized in that: The cylindrical base (1), the positioning steel sleeve (2) and the ejector base (4) are all made of steel.

10. A fixture for difficult-to-process cylindrical grinding according to claim 9, characterized in that: The diameter of the cylindrical base (1) is 5 to 10 mm smaller than the diameter of the blank round rod portion (301) of the blank product (3), so as to ensure an effective contact area between the cylindrical base (1) and the blank product (3).

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