A positioning fixture for engine cylinder block castings

Abstract

This invention relates to the technical field of tooling fixtures, specifically a positioning fixture for an engine cylinder block casting, comprising: a base plate and a pair of positioning components. The base plate has multiple support columns for supporting the engine cylinder block casting. Each positioning component includes a positioning seat, a swing block, and a limiting rod; the positioning seat is mounted on the base plate, the swing block is rotatably mounted on the positioning seat, and the limiting rod is mounted on the positioning seat. A support portion for supporting the engine cylinder block casting is provided near the second side of the swing block, and the swing block also has a positioning portion. After the paired positioning portions extend into the positioning holes on the engine cylinder block casting, the engine cylinder block casting abuts against the support portion. This invention utilizes the weight of the engine cylinder block casting itself to drive the two swing blocks to rotate, thereby causing the two positioning portions to pull and tighten in opposite directions or press against each other, ensuring reliable positioning of the engine cylinder block casting and preventing it from shaking, thus guaranteeing machining quality and accuracy.

Description

Technical Field

[0001] This invention relates to the technical field of tooling fixtures, and more particularly to a positioning fixture for engine cylinder block castings. Background Technology

[0002] Currently, engine cylinder blocks are usually formed by casting due to their complex shape. The cast blanks have riser remnants of varying sizes on their surface. In the post-processing, grinding process, the positioning accuracy of the cylinder block blank is very important. Over-grinding and under-grinding will affect the assembly with other parts.

[0003] When grinding cylinder block blanks, the grinding equipment typically needs to position the product to be processed using a positioning fixture to facilitate machining by the grinding wheel. Therefore, the quality of the positioning fixture design directly affects the product quality and processing efficiency. The existing positioning fixtures have the following drawbacks: unreliable positioning causes wobbling in subsequent processing steps, reducing the quality and accuracy of the cylinder block casting during processing. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] This invention provides a positioning fixture for engine cylinder block castings, which aims to solve the technical problem that the positioning fixtures in the prior art are not reliable in positioning the workpiece, causing it to wobble in subsequent processing steps.

[0006] (II) Technical Solution

[0007] To address the aforementioned problems, the present invention provides a positioning fixture for an engine cylinder block casting, the positioning fixture comprising: a base plate and a pair of positioning components;

[0008] The base plate is provided with multiple support columns for supporting the engine cylinder block casting.

[0009] The positioning assembly includes a positioning seat, a swing block, and a limiting rod; the positioning seat is mounted on the base plate, the swing block is rotatably mounted on the positioning seat, the limiting rod is mounted on the positioning seat, the limiting rod is close to the first side of the swing block, and the limiting rod is used to abut against the bottom surface of the swing block to limit the rotation of the swing block;

[0010] The swing block is provided with a support part for supporting the engine cylinder block casting at the second side near the swing block. The swing block is also provided with a positioning part for extending into the positioning hole provided on the engine cylinder block casting.

[0011] The first and second sides of the swing block are two opposing sides. The positioning part is located between the first and second sides of the swing block. The rotation axis of the swing block is parallel to the first side and located between the first and second sides of the swing block.

[0012] After the paired positioning parts extend into the positioning holes on the engine cylinder block casting, the engine cylinder block casting abuts against the support part, and the swing block rotates so that the positioning parts abut against the inner wall of the positioning holes on the engine cylinder block casting.

[0013] Preferably, the positioning component further includes a fixing seat; the positioning seat is slidably disposed on the fixing seat.

[0014] Preferably, the first side of the positioning seat is provided with a first internal thread hole, the first side of the positioning seat is on the same side as the first side of the swing block, one end of the limiting rod is provided with an external thread that mates with the first internal thread, and the other end of the limiting rod is used to abut against the swing block.

[0015] Preferably, the positioning assembly further includes an adjusting pin, a plug, and a spring;

[0016] The second side of the positioning seat is provided with a second internal thread hole. The second side of the positioning seat is on the same side as the second side of the swing block. The plug is provided in the second internal thread hole and is provided with an external thread. One end of the adjusting pin is located in the second internal thread, and the spring is provided between the adjusting pin and the plug. The other end of the adjusting pin abuts against the bottom surface of the swing block.

[0017] Preferably, the support part is a support pin, which is inserted into the swing block.

[0018] Preferably, the surface of the positioning part that contacts the positioning hole provided on the engine cylinder block casting is an inclined surface.

[0019] Preferably, the positioning part is provided with a countersunk hole for fixing it to the swing block.

[0020] Preferably, within the pair of positioning components, the first side of one swing block faces away from the first side of the other swing block.

[0021] Preferably, the fixed base is provided with a sliding groove, the positioning base is slidably disposed on the sliding groove, and the positioning base is provided with adjustment holes on both sides of the sliding groove. An adjustment screw is disposed in the adjustment hole, and one end of the adjustment screw is used to pass through the adjustment hole and abut against the positioning base.

[0022] (III) Beneficial Effects

[0023] This invention utilizes a pair of positioning components on the base plate. By leveraging the weight of the engine cylinder block casting itself, two swing blocks rotate, causing the two positioning parts to pull and tighten or press against the engine cylinder block casting in opposite directions. This ensures reliable positioning of the engine cylinder block casting. The greater the weight on the engine cylinder block casting, the greater the pulling or pressing force exerted by the two swing blocks. During subsequent processing, the engine cylinder block casting will not wobble, thus guaranteeing processing quality and precision. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the positioning fixture for the engine cylinder block casting of the present invention;

[0025] Figure 2 This is a cross-sectional view of the positioning fixture for the engine cylinder block casting of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view at point A;

[0027] Figure 4 This is an assembly diagram of the positioning component on the fixed base in this invention.

[0028] [Explanation of Labels in the Attached Image]

[0029] 1: Base plate; 11: Support column; 12: Fixing base; 13: Slide groove; 14: Adjustment hole; 15: Adjustment screw;

[0030] 2: Positioning component; 21: Positioning seat; 211: First internal threaded hole; 212: Second internal threaded hole; 22: Swing block; 22-A: First side; 22-B: Second side; 221: Support part; 222: Positioning part; 23: Limiting rod; 24: Adjusting pin; 25: Plug; 26: Spring;

[0031] 3: Engine cylinder block castings. Detailed Implementation

[0032] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] like Figures 1 to 4 As shown, in this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] This invention provides a positioning fixture for an engine cylinder block casting 3, which includes a base plate 1 and a pair of positioning components 2. The base plate 1 is provided with a plurality of support columns 11 for supporting the engine cylinder block casting 3.

[0037] The positioning assembly 2 includes a positioning seat 21, a swing block 22, and a limiting rod 23. The positioning seat 21 is mounted on the base plate 1, and the swing block 22 is rotatably mounted on the positioning seat 21 (specifically, the swing block 22 is rotatably mounted on the positioning seat 21 via a rotating shaft, and the swing block can rotate along the axis of the rotating shaft). The limiting rod 23 is mounted on the positioning seat 21 and is close to the first side 22-A of the swing block 22. The limiting rod 23 is used to abut against the bottom surface of the swing block 22 to limit the rotation of the swing block 22.

[0038] A support portion 221 for supporting the engine cylinder block casting 3 is provided near the second side 22-B of the swing block 22. A positioning portion 222 is also provided on the swing block 22, which extends into a positioning hole provided on the engine cylinder block casting 3. The first side 22-A and the second side 22-B of the swing block 22 are two opposing sides. The positioning portion 222 is located between the first side 22-A and the second side 22-B of the swing block 22. The rotation axis of the swing block 22 is parallel to the first side 22-A and located between the first side 22-A and the second side 22-B of the swing block 22. After the positioning portions 222 on both positioning components 2 extend into the positioning holes on the engine cylinder block casting 3, the engine cylinder block casting 3 abuts against the support portion 221. The swing block 22 rotates so that the positioning portion 222 abuts against the inner wall of the positioning hole on the engine cylinder block casting 3.

[0039] In the technical solution of this invention, when the engine cylinder block casting 3 is placed on the base plate 1, the positioning hole on the engine cylinder block casting 3 is fitted onto the positioning part 222. At this time, the engine cylinder block casting 3 presses on the support part 221, and the swing block 22 swings towards its second side 22-B under the action of the gravity of the engine cylinder block casting 3. The positioning part 222 abuts against the inner wall of the positioning hole, and then the limiting rod 23 limits the swing block 22, so that the swing block 22 cannot swing towards its first side 22-A, thereby achieving the limitation of the swing block 22. Since the base plate 1 is provided with two pairs of positioning components 2, and the two positioning components 2 are symmetrically arranged, the rotation direction of the swing block 22 on the positioning component 2 is opposite. The two positioning parts 222 on the swing block can achieve reverse pulling and tightening or opposite pressing and tightening under the action of the gravity of the engine cylinder block casting 3, ensuring that the engine cylinder block casting 3 is reliably positioned. It should be noted that the workpiece needs to be clamped during the subsequent processing. The positioning fixture of this application is used to pre-clamp the workpiece. The greater the weight of the engine cylinder block casting 3, the greater the pulling or pressing force of the two swing blocks 22 on the engine cylinder block casting 3, so that the engine cylinder block casting 3 will not shake during the subsequent processing, thus ensuring the processing quality and accuracy.

[0040] Furthermore, the positioning assembly 2 also includes a fixed seat 12; the positioning seat 21 is slidably disposed on the fixed seat 12. Sliding the positioning seat 21 on the fixed seat 12 facilitates the adjustment of the distance between the two positioning seats 21, so as to achieve positioning of different models of engine cylinder block castings 3.

[0041] In a preferred embodiment, the fixed base 12 is provided with a slide groove 13, and the positioning base 21 is slidably disposed on the slide groove 13. Adjustment holes 14 are provided on opposite sides of the positioning base 21 at the slide groove 13. Adjustment screws 15 are disposed within the adjustment holes 14, with one end of each screw passing through the adjustment hole 14 and abutting against the positioning base 21. In this design, two adjustment screws 15 are used to fix the position of the positioning base 21 in the slide groove 13, achieving a simple and reliable structure.

[0042] Furthermore, the first side of the positioning seat 21 is provided with a first internal threaded hole 211. The first side of the positioning seat 21 is on the same side as the first side 22-A of the swing block 22. The outer wall of the limiting rod 23 is provided with an external thread that mates with the first internal thread. The top end of the limiting rod 23 is used to abut against the swing block 22. By adjusting the depth of the limiting rod 23 inserted into the first internal threaded hole 211, the swing block 22 can be limited to different positions.

[0043] In addition, the positioning assembly 2 also includes an adjusting pin 24, a plug 25, and a spring 26. A second internal threaded hole 212 is provided on the second side of the positioning seat 21, and the second side of the positioning seat 21 is on the same side as the second side 22-B of the swing block 22. The plug 25 is disposed in the second internal threaded hole 212, and the plug 25 has external threads; one end of the adjusting pin 24 is also disposed in the second internal threaded hole 212, and a spring 26 is disposed between the adjusting pin 24 and the plug 25, and the other end of the adjusting pin 24 abuts against the bottom surface of the swing block 22. In this design, rotating the plug 25 can adjust the position of the plug 25 in the second internal threaded hole 212 (e.g., ...). Figure 3 As shown, the plug is a cylindrical part with an external thread on its circumference. When the plug rotates along its own center line, it moves along the center line of the second internal thread hole. The position of the adjusting pin 24 can be adjusted by the spring 26, thereby adjusting the initial position of the swing block 22.

[0044] In a preferred embodiment, the support part 221 is a support pin, which is inserted into the swing block 22. The surface of the positioning part 222 that contacts the positioning hole provided on the engine cylinder block casting 3 is an inclined surface. When the positioning part 222 rotates with the swing block 22 and abuts against the inner wall of the positioning hole, the surface of the positioning part 222 that contacts the positioning hole provided on the engine cylinder block casting 3 is set as an inclined surface, which increases the contact area and makes the positioning more secure. The positioning part 222 is provided with a countersunk hole for fixing it to the swing block 22.

[0045] Finally, within the paired positioning components 2, the first side 22-A of one swing block 22 faces away from the first side 22-A of the other swing block 22. That is, the two positioning components 2 are symmetrically arranged, and the two sets of positioning components 2 are arranged in opposite directions to pull the workpiece securely to both sides.

[0046] It should be understood that the above description of specific embodiments of the present invention is only for illustrating the technical approach and features of the present invention, and is intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of the present invention should be covered within the protection scope of the present invention.

Claims

1. A positioning fixture for an engine cylinder block casting, characterized in that, The engine cylinder block casting positioning fixture includes: a base plate and a pair of positioning components; The base plate is provided with multiple support columns for supporting the engine cylinder block casting. The positioning assembly includes a positioning seat, a swing block, and a limiting rod; the positioning seat is mounted on the base plate, the swing block is rotatably mounted on the positioning seat, the limiting rod is mounted on the positioning seat, the limiting rod is close to the first side of the swing block, and the limiting rod is used to abut against the bottom surface of the swing block to limit the rotation of the swing block; The swing block is provided with a support part for supporting the engine cylinder block casting at the second side near the swing block. The swing block is also provided with a positioning part for extending into the positioning hole provided on the engine cylinder block casting. The first and second sides of the swing block are two opposing sides. The positioning part is located between the first and second sides of the swing block. The rotation axis of the swing block is parallel to the first side and located between the first and second sides of the swing block. After the paired positioning parts extend into the positioning holes on the engine cylinder casting, the engine cylinder casting abuts against the support part, and the swing block rotates so that the positioning parts abut against the inner wall of the positioning holes on the engine cylinder casting. Within the paired positioning components, the first side of one of the swing blocks faces away from the first side of the other swing block.

2. The positioning fixture for the engine cylinder block casting as described in claim 1, characterized in that, A fixed seat is provided on the base plate; the positioning seat is slidably mounted on the fixed seat.

3. The positioning fixture for the engine cylinder block casting as described in claim 2, characterized in that, The positioning seat has a first internal thread hole on its first side, and the first side of the positioning seat is on the same side as the first side of the swing block. One end of the limiting rod has an external thread that mates with the first internal thread, and the other end of the limiting rod is used to abut against the swing block.

4. The positioning fixture for the engine cylinder block casting as described in claim 3, characterized in that, The positioning assembly also includes an adjusting pin, a plug, and a spring; The second side of the positioning seat is provided with a second internal thread hole. The second side of the positioning seat is on the same side as the second side of the swing block. The plug is provided in the second internal thread hole and is provided with an external thread. One end of the adjusting pin is located in the second internal thread, and the spring is provided between the adjusting pin and the plug. The other end of the adjusting pin abuts against the bottom surface of the swing block.

5. The positioning fixture for the engine cylinder block casting as described in any one of claims 1-4, characterized in that, The support part is a support pin, which is inserted into the swing block.

6. The positioning fixture for the engine cylinder block casting as described in any one of claims 1-4, characterized in that, The surface of the positioning part that contacts the positioning hole on the engine cylinder block casting is an inclined surface.

7. The positioning fixture for the engine cylinder block casting as described in any one of claims 1-4, characterized in that, The positioning part is provided with countersunk holes for fixing it to the swing block.

8. The positioning fixture for the engine cylinder block casting as described in any one of claims 2-4, characterized in that, The fixed base is provided with a sliding groove, and the positioning base is slidably disposed on the sliding groove. The positioning base is provided with adjustment holes on both sides of the sliding groove. An adjustment screw is provided in the adjustment hole, and one end of the adjustment screw is used to pass through the adjustment hole and abut against the positioning base.

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